GB/T 2900.25-1994 Electrical terminology Rotating electrical machines
Some standard content:
National Standard of the People's Republic of China
Electrical terminology
Rotating electrical machines
Electrotechnical terminologyRotating electrical machinesGB/T 2900.25--94
Replaces GB2900.2.--82
This standard adopts the International Electrotechnical Commission (IEC) publication IEC50 (411) "Rotating electrical machines" (2 (Central Office) 554, 574) by reference, and retains some terms commonly used in China in the original GB2900.25--82. 1 Subject content and scope of application
This standard specifies the special terms for rotating electrical machines. This standard is applicable to the formulation of standards, preparation of technical documents, compilation and translation of professional manuals, teaching materials and books and periodicals, and is used by personnel in production, scientific research, use and teaching and other related departments engaged in electrical professional work. The terms specified in this standard are coordinated with the relevant parts of GB/T2900.1 "Basic terms of electrical terminology"; terms not specified in this standard may be specified in relevant standards when necessary. 2 Reference standards
GB1.1 Basic provisions for the preparation of standards in the guidelines for standardization work GB1.6 Provisions for the preparation of terminology standards in the guidelines for standardization work GB/T2900.1 Basic terms of electrical L terms
3 Electric machines
3.1--General terms
3.1.1 Electric machine; electric machine is an energy converter that converts electrical energy into mechanical energy or mechanical energy into electrical energy. It has parts that can move relative to each other and is an electrical device that operates by electromagnetic induction. Note: This term also applies to electrical devices with the same principle and similar structure for other purposes (such as changing voltage, current, and frequency), but does not apply to electrostatic machines.
3.7.2 Rotating machine (electrical) rotating machine An electrical device that relies on electromagnetic induction to operate. It has parts that can make relative rotational motion and is used to convert energy. Note: () This term is also applicable to electrical devices with the same principle and similar structure and used for other purposes (such as for regulating, generating or absorbing reactive power), but it does not apply to electrostatic machines.
②) This term can be referred to as motor if it does not cause misunderstanding or confusion. 3.1.3 Homopolar machine - a motor in which the magnetic field lines of force pass through the entire area of the air gap from one component to another component in the same direction. 3.1.4 Acyclic machine - a DC homopolar machine.
3.1.5 Heteropolar machine Approved by the State Administration of Technical Supervision on April 12, 1994 120
Implemented on December 1, 1994
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A motor in which tangible magnetic poles or equivalent magnetic poles of different polarities are arranged alternately. 3.1.6 Direct current machine; dcmachine A motor whose armature winding is connected to the DC system through a commutator, and whose magnetic poles are excited by DC or fluctuating current or are permanent magnets. 3.1.7 Alternating current machine; ac machine A motor with an armature winding connected to the AC system. 3.1.8 Double-fed machine A motor whose stator winding and rotor winding are powered by an AC power supply. 3.1.9 Synchronous machine A motor in which the ratio of the frequency of the electromotive force to the motor speed is a constant value. 3.1.10
Asynchronous machineA type of AC motor whose speed under load is not constant relative to the frequency of the grid to which it is connected. 3.1.11Induction machineA type of asynchronous motor with only the winding connected to the power supply. 3.1.12Inductor machineA type of synchronous motor, usually with armature windings and field windings or permanent magnets arranged appropriately relative to each other on its stationary parts, and no windings on its rotating parts, but only with a number of regular protrusions. 3.1.13Permanent magnet machineA type of motor whose magnetic system includes one or more permanent magnets. 3.1.14Single-phase machineA motor that generates or uses single-phase AC. 3.1.15Polyphase machineA motor that generates or uses polyphase AC. 3.1.16Salient pole machineA motor whose poles protrude from the yoke of the base or the hub of the rotor toward the air gap. Solid pole shoe machine3. 1. 17
Salient pole machine with non-laminated pole shoes.
Cylindrical rotor machine3.1.18.
A machine with a cylindrical rotor with slots on the rotor surface and the coil edges of the winding embedded in the slots. 3.1.19
Non-salient pole machineA machine with distributed winding excitation and non-protruding poles. 3.1.20Turbine-type machineA cylindrical rotor machine running at a high rotor speed. Note: This term is mostly applied to AC generators, such as steam turbine generators. 3.1.21
Disc type machine
A machine with an axial air gap and a disc-shaped rotor. 3.2Generator
Generator
A machine that converts mechanical energy into electrical energy.
3.2.2 Direct current generator A generator that produces direct current voltage and current. 3.2.3 Alternating current generator A generator that produces alternating current voltage and current. 121
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3.2.4 Synchronous generator A synchronous motor that operates as a generator.
3.2.5 Turbine-type generator; turbo-generator A cylindrical rotor turbine-type synchronous motor that operates as a generator driven by a steam turbine. 3.2.6 Hydraulic turbine-driven synchronous generator A synchronous generator driven by a turbine. 3.2.7
Double wound synchronous generator; double-winding synchronous generator
A synchronous generator that has two sets of similar armature windings on the same magnetic structure and can supply power to two independent circuits. 3.2.8 Asynchronous generator Asynchronous motor that operates as an AC generator. 3.2.9 Induction generator Induction generator An induction motor that is connected to a reactive power source and operates as a generator. Note: In general, induction generators can be called asynchronous generators if it does not cause misunderstanding or confusion. 3.2.10 Constant voltage generator A generator whose terminal voltage is basically constant, that is, the voltage is basically unaffected by the load. 3.2.11 Constant current generator A generator whose output current is basically constant, that is, the current is basically unaffected by the load. 3.2.12 Exciter
A generator that supplies all or part of the excitation power to the field winding of another motor. Note: The exciter can be a DC motor or an AC motor, and it is a part of the excitation system. 3.2.13 Main exciter
An exciter that supplies excitation power to the field winding of one or more main motors. Auxiliary exciter Pilat exciter
An exciter used to provide excitation power to another exciter. 3.3 Motor
3.3.1 Motor motor
A motor that converts electrical energy into mechanical energy.
·3.3.2 Direct current motor Direct current motor A motor that runs on a DC power supply.
3.3.3 Alternating current motor A motor that runs on an AC power supply.
3.3.4 Universal motor Universal motor A motor that can run on both a DC power supply and a single-phase AC power supply. 3.3.5 Synchronous motor Synchronous motor A synchronous motor that runs as a motor.
3.3.6 Cage synchronous motor Cage synchronous motor A salient pole synchronous motor with a cage winding for starting embedded in the pole shoe. 3.3.7 Synchronous induction motor A cylindrical rotor synchronous motor with a secondary winding similar to that of a wound rotor induction motor that can be used for both starting and excitation.
3.3.8 Reluctance motor A synchronous motor with an unexcited rotor and a number of regularly shaped projections on which a cage winding or an unmounted cage winding for starting is mounted.
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3.3.9 Subsynchronous eluctance motor A reluctance motor with a secondary component having more projections acting as salient poles than the number of poles formed by the primary winding. The motor operates at a constant average speed equivalent to a fraction of the apparent synchronous speed of the motor. 3.3.10 Asynchronous motor Asynchronous motor operating as a motor.
Induction motor Induction motor operating as a motor.
Note: Induction motors are generally referred to as asynchronous motors without causing misunderstanding or confusion. 3.3.12 Cage induction motor; squirrel cage induction motor An induction motor with a cage-type secondary winding. 3.3.13 Wound-rotor induction motor; slip-ring induction motor An induction motor, usually with a primary winding on the stator connected to the power supply and a multi-phase winding on the rotor connected to the slip ring. 3.3.14 Brushless wound-rotor induction motor Brushless wound-rotor induction motor A wound-rotor induction motor with a secondary winding directly connected to a matching rotary starter. 3.3.15 Hysteresis motor Hysteresis motor A synchronous motor with a smooth cylindrical rotor made of magnetic material, a non-field winding, starting by the hysteresis effect of the rotor, and running at synchronous speed by relying on the remanence of the rotor. 3.3.16 shaded pole motor a single-phase induction motor having one or more auxiliary short-circuited windings which are offset in field position relative to the main winding by an angle. All of these windings are on the primary core, usually the stator. 3.3.172
split phase motor
a single-phase induction motor having an auxiliary circuit connected in parallel with the main winding and having an auxiliary winding which is offset in field position relative to the main winding, such that there is a phase difference between the currents in the two windings. The auxiliary circuit is usually disconnected when the motor reaches the appropriate speed.
3.3.18 resistance start split phase motor a split phase motor in which the phase difference between the currents in the main winding and the auxiliary circuit is provided by resistance, either provided by the auxiliary winding itself or by a separate series resistor. 3.3.19 Reactor start split phase motor A split phase motor that relies on additional inductive reactance in the motor main circuit to produce a phase difference between the currents in the two windings. When the auxiliary circuit is disconnected, the additional inductive reactance is short-circuited or otherwise rendered ineffective. 3.3.20 Capacitor motor A split phase motor that relies on capacitors in the auxiliary circuit to produce a phase difference between the currents in the two windings. Capacitor start motor 3.3.21
A capacitor motor whose auxiliary circuit is energized only during motor starting. 3.3.22
Capacitor start and run motor; permanent split capacitor motor A capacitor motor whose auxiliary circuit is energized during both motor starting and running. 3.3.23 Two-value capacitor motor A capacitor start and run motor that uses capacitors of different values during starting and running. 3.3.24 Polyphase commutator motor An AC motor that supplies power to the multiphase armature winding via a commutator. 3.3.25 Singlephase commutator motor An AC motor that supplies power to the single-phase armature winding via a commutator. 123
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3.3.26 Polyphase shunt commutator motor; Schrage motor A polyphase motor whose rotor has two sets of windings, one of which gets current from the power supply through a collector ring, and the other is connected to the commutator. The commutator surface is equipped with two sets of adjustable brushes, and supplies the separate phase windings on the stator with an adjustable voltage, thereby adjusting the motor speed and the reactive power taken from the power supply. 3.3.27 Repulsion motor A single-phase induction motor having a primary winding on the stator connected to a power source and a secondary winding on the rotor connected to a commutator, the brushes on the commutator being short-circuited and capable of changing their position along the circumference of the commutator. 3.3.28 Double brush repulsion motor; Derimotor A repulsion motor having two sets of brushes, one fixed and the other movable. 3.3.29 Compensated repulsion motor A repulsion motor in which the primary winding on the stator is connected in series with the rotor winding via a second set of brushes on the commutator to improve power factor and commutation.
3.3.30 Repulsion start induction motor A repulsion motor in which the commutator segments are short-circuited or otherwise connected when the appropriate speed is reached so that the rotor winding forms an equivalent cage winding. Www.bzxZ.net
3.3.31 Repulsion induction motor Repulsion motor with additional cage winding on the rotor. 3.3.32 Torque motor torquemotor
A motor with soft mechanical characteristics. When the motor is in working state, the maximum torque is generated near the stall point. It can work for a short time in the stall state and can run stably between stall and no-load. 3.3.33 Starting motor Starting motor Auxiliary motor mechanically connected to the main engine to facilitate the starting and acceleration of the main engine. 3.3.34 Conical rotor motor Conical rotor motor A motor with a truncated cone-shaped rotor.
5 General purpose motor general purpose motor 3.3.35
A motor designed according to standard quotas, with product catalogs and supplied, whose operating characteristics and mechanical structure are suitable for general operating conditions, but not limited to a specific purpose or a certain type of specific purpose. 3.3.36 Definite purpose motor: A motor designed, catalogued and supplied according to standard quotas, whose operating characteristics or mechanical structure or both are suitable for a specific purpose or a certain type of specific purpose. 3.3.37 Special purpose motor A motor designed for a specific purpose with special operating characteristics or special mechanical structure or both. This motor does not fall within the definition of general purpose or specified purpose. 3.3.38
Motor with standardized mounting dimensions A motor whose mounting dimensions allow it to be interchanged with other motors of the same frame size and in accordance with the same standard specifications.
Small power motor Small power motor
A motor with a maximum continuous rating of no more than 1.1 kW when converted to 1500 r/min. 3.3.40 Fractional horse-power motor A motor with a maximum continuous rating of no more than 1 hp when converted to 1000 r/min. 3.3.41 Constant speed motor A motor whose speed remains constant or substantially constant within the normal load range. 3.3.42 Varying speed motar124
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A motor with a significant change in speed within the normal load range, usually with a decrease in speed as the load increases. Multi-speed motor
A motor that can run at any one of two or more specified speeds under a specified load. 3.3.44
Multi-constant speed motorA multi-speed motor that, within the normal load range, keeps a constant or substantially constant speed when running at each speed. 3.3.45
Multi-varying speed motorA multi-speed motor that, within the normal load range, keeps a significant change in speed when running at each speed. 3.3.46 Adjustable speed motorA motor that, under a specified load, can adjust its speed to any value within a specified range. 3.3.47 Adjustable constant speed motor A speed regulating motor that has the characteristics of a constant speed motor for any set speed. B Adjustable varying speed motor 3.3.48
A speed regulating motor that has the characteristics of a variable speed motor for any set speed. 3.4 Special motors
3.4.1 Electric dynamometer A motor used for measuring mechanical power, equipped with a torque indicating device and a speed indicating device. 3.4.2 Booster
A motor connected in a circuit whose voltage can be added to or subtracted from the voltage provided by another power supply. 3.4.3 Dynamotor A DC motor with a set of excitation windings and two sets of independent armature windings that can operate simultaneously, one set operating as a motor and the other set operating as a generator. 3.4.4 Direct current balancer Two or more DC motors of the same specification mechanically coupled together, used to automatically balance the line voltage of a multi-line DC system. 3.4.5 Synchronous campensatar, synchronous condenser Synchronous motors that have no mechanical load and only supply or absorb reactive power. 3.4.6 Phase advancer
A motor that supplies reactive power to the secondary winding of a wound rotor induction motor to improve the power factor of the motor. 3.4.7 Motor generator set A complete set of one or more motors mechanically coupled with one or more generators. 3.4.8 Rotary converter A motor whose armature winding is connected to a commutator and a collector ring, used to convert AC power into DC power, or DC power into AC power.
3.4.9 Motor Converter A unit consisting of an induction motor and a rotating converter coaxially coupled, the current generated in the motor rotor flows through the armature winding of the converter.
3.4.10 (rotating) frequency converter A motor that converts AC power from one frequency to another. 3.4.11 Commutator type frequency converter A multi-phase motor whose rotor has one or two sets of windings connected to the commutator and the collector ring. As long as an AC voltage of one frequency is applied to the brush terminals of the commutator or collector ring, an AC voltage of another frequency can be obtained at the brush terminals of the collector ring or commutator.
3.4.12 Frequency changer set A motor generator set that converts AC power from one frequency to another. 125
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3.4.13 Induction frequency converter - A wound induction motor that changes frequency through the induction effect between the relatively rotating primary and secondary windings. The secondary winding outputs power at a frequency proportional to the relative speed between the primary winding magnetic field and the secondary winding assembly. 3.4.14 Inductor frequency converter - A motor with two sets of stator windings. One set has an AC input and acts as an excitation; the other set of stator output windings with different poles induces a voltage of output frequency due to the change in magnetic field reluctance when the rotor (toothed rotor) with regular protrusions rotates. 3.4.15 (Rotating) phase converter - A motor that changes the number of phases while converting electrical energy. 3.4.16 Electric coupling An electric motor that transmits torque from one rotating shaft to another by electromagnetic or magnetic means, with the relative speed of the two rotating shafts being controllable.
Induction coupling Induction coupling A type of electric coupling that transmits torque by means of the interaction between the magnetic field generated by the magnetic poles on one rotating part and the induced current in the other rotating part.
3.4.18 Magnetic coupling; Slip coupling A type of inductive coupling with a wound or cage-type secondary winding that carries an induced current. 3.4.19 Eddy current coupling An inductive coupling whose secondary component carries an induced current. 3.4.20 Synchronous coupling A type of electric coupling that transmits torque by the mutual attraction of magnetic poles on a driving and driven part rotating at the same speed. 3.4.21 Hysteresis coupling An electrical coupling that transmits torque by means of the force generated by the reorientation of magnetic domains in ferromagnetic materials against magnetic fields. 3.4.22 Magnetic friction clutch A friction clutch that uses magnetic devices to engage or disengage friction surfaces. 3.4.23 Magnetic particle coupling An electrical coupling that uses magnetic particles gathered in the magnetic field between the coupling parts as a medium to transmit torque. 3.5 Motors for control systems
3.5.1 DC generator-motor system; Ward-Leonard system A method for controlling the speed and direction of a DC motor, controlling the field current of the DC generator supplying power to change the motor armature voltage, and, if necessary, changing the polarity of the armature voltage. 3.5.2 DC generator-motor set, Ward-Leonard generator set A complete set consisting of one or more DC generators and one or more drive motors, used in Ward-Leonard systems. 3.5.3 Static cascade speed control system; static Kraemersystem A speed control system for a wound rotor induction motor at a speed lower than the synchronous speed. The motor's slip power is fed back through a static converter, which is electrically connected between the induction motor's secondary winding and the power supply. 3.5.4 Rotary amplifier A motor that amplifies the input signal to obtain power output. 3.6 Restrictive terms
3.6.1 Separately excited Used to indicate that the excitation of the motor is supplied by other power sources rather than the motor itself. Note: Excitation can also be called excitation. Separately excited, self-excited, and mixed excitation can also be called separately excited, self-excited, and mixed excitation. 3. 6.2 Self-excited
Used to indicate that the excitation of the motor is supplied by the motor itself. 126
Compositely excited
3.6.3 Mixed excited
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Used to indicate that part of the excitation of the motor is supplied by the motor itself and part is supplied by other power sources. 3.6.4 Shunt
Used to indicate that the motor is excited by a winding connected in parallel with the armature winding. 3.6.5 series excited
is used to indicate that the motor is excited by a winding connected in series with the armature winding. 3.6.6 compound excited
is used to indicate that the motor is excited by at least two windings, one of which is a series excited winding. 3.6.7 cumulative compounded is used to indicate that the magnetic potential directions of the series excited winding and the shunt excited winding of a compound excited motor are the same. 3.6.8 differential compounded is used to indicate that the magnetic potential directions of the series excited winding and the shunt excited winding of a compound excited motor are opposite. 3.6.9 over-compounded
is used to indicate that the series excited winding of a compound excited generator will make the terminal voltage of the motor at rated load greater than the terminal voltage at no load. 3.6.10 level compounded; flat compounded is used to indicate that the series excited winding of a compound excited generator will make the terminal voltage of the motor at rated load equal to the terminal voltage at no load. 3.6.11 under-compounded refers to a compound-excited generator whose series-wound windings cause the motor terminal voltage to be less than the no-load terminal voltage at rated load. stabilized shunt (for a generator) 3.6.12
refers to an under-compounded generator whose load produces a voltage drop that allows the generator to be operated in parallel without an equalizing line. 3.6.13
stabilized shunt (for a motor) refers to a compound-excited motor whose series-wound windings are so proportioned and polarized that the motor speed is slightly reduced as the load increases. 3.6.14 self-regulated
refers to a motor with a single-core that can control its own characteristics, such as voltage, power factor, and speed, without the intervention of external equipment.
Compensated regulated 3. 6. 15
refers to the ability of a motor to self-regulate its own characteristics, such as voltage, power factor and speed, when combined with an externally excited power source. 3.6.16
Automatically regulated refers to the ability of a motor to self-regulate its own characteristics when combined with other electrical equipment in an appropriate closed loop. 3.6.17 Brushless
refers to a motor without traditional brush components.
3.6.18 Inverted
refers to a motor in which the normal electromagnetic functions of the stator and rotor are interchanged. : 4 Structure - Windings, magnetic components, conductive components and mechanical structure 4.1 Winding classification
4.1.1 Windings
A group of turns or coils in a rotating motor with a specified function. 4.1.2 Primary winding - A winding in an induction motor that is connected to the external power system when the motor is running to absorb or send active power. 4.1.3 Secondary winding secondarywinding A winding in an induction motor that is not directly connected to an external power system when the motor is running 4.1.4 Main winding main winding
The primary winding of a split-phase motor.
4.1.5 Stator winding
The winding on the stator of a motor.
4.1.6 Rotor winding rotor winding
The winding on the rotor of a motor.
Armature winding armature winding
GB/T 2900.25--94
A winding of a synchronous, DC or single-phase commutator motor that is connected to an external power system to absorb or deliver active power. Note: This definition also applies to synchronous compensators, except that reactive power replaces active power. 4.1.8 Damping winding is usually a cage-type short-circuit winding, or a winding that can be short-circuited, used to suppress the rapid changes in the magnetic flux linked to the winding turns. 4.1.9 Starting winding Winding used to start the motor.
4.1.10 Auxiliary starting winding Starting winding of a split-phase motor.
Excitation winding
Winding that generates a magnetic field, the magnetic field is stationary relative to the winding. 4. 1. 12
Field winding
Field winding Excitation winding that generates the main magnetic field of the motor.
4.1.13 Compensating winding
I Compensating winding
A type of excitation winding that carries the load current or a current proportional to it, thereby reducing the magnetic field distortion caused by the load current flowing through other windings.
4.1.14 Commutating winding A field winding in a commutator motor that carries a load current or a current proportional to it to promote the change of direction of the current in the coil being commutated.
4.1.15 Control winding A field winding that carries an adjustable current to control the performance of the motor. 4.1.16 Shunt winding
A field winding that spans all or part of the armature circuit. 4.1.17
, series winding
A field winding connected in series with the armature winding that carries part or all of the armature current. 4.1.18 Distributed winding A winding whose coil side occupies several slots under each pole. 4.1.19 Concentrated winding A field winding of a salient pole motor, or a winding whose coil side occupies only one slot under each pole. Cage winding squirrel cage winding4.1.20
A winding composed of several conductive bars connected by conductive rings or conductive plates at both ends. Split throw winding
A double-layer winding in which the wires on one side of the coil are in the same slot, while the wires on the other side are not in the same slot. 4.1.22 "
Concentric winding
A distributed winding in which the coils of each pole phase group are concentrically arranged with different pitches. 4.1.23 Diamond winding A distributed winding in which the pitch and shape of each coil are the same. 4 Chain winding
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-A single-layer distributed winding, in which the coils have the same shape and pitch, and the number of slots per pole and phase is 2. 4.1.25 Lapwinding
-A double-layer winding, in which all the turns distributed under the main poles are connected in sequence, and the coil groups under adjacent main pole pairs are connected to each other in the order of pole pairs.
Note: Only applicable to DC motor armature windings. 4.1.26 Wavewinding
A double-layer winding, in which the coil connection sequence is to connect the coil units under adjacent main pole pairs in a direction around the motor.
4.1.27 Frog-leg winding A combined winding consisting of a lap winding and a wave winding placed in a common slot and connected to the same commutator. 4.1.28 Simplex lap winding - A lap winding whose number of parallel connections is equal to the number of poles. Note: Applicable only to DC motor armature windings. Simplex wave winding 4.1.29
A wave winding whose number of parallel connections is always equal to 2, regardless of the number of poles. 4.1.30 Simplex frog-led winding A frog winding composed of a simple lap winding and a double wave winding. Duplex lap winding
A lap winding whose number of parallel connections is twice the number of poles. Note: Applicable only to DC motor armature windings. 4.1.32
Duplex wave winding
A wave winding whose number of parallel connections is always equal to 4, regardless of the number of poles. Duplex frog-leg winding 4.1.33
A frog winding composed of a double lap winding and a double wave winding. 4.1.34 Multiplex lap winding A lap winding whose number of parallel connections is an integer multiple of the number of poles and the multiple is greater than 2. Note: Applicable only to DC motor armature windings. 4.1.35 Multiplex wave winding A wave winding whose number of parallel connections is a multiple of 2 except 4, regardless of the number of poles. 4.1.36
Single layer winding A distributed winding with only one coil side per slot along the slot depth direction. Two layer winding
A distributed winding with two coil sides per slot along the slot depth direction. Single and two layer winding 4.1.38
A distributed winding with one coil side in one part of the slots and two coil sides in the other part of the slots. Regular winding
A winding with regular arrangement of the conductors in the coil sides. 4.1.40 Preformed winding A regular winding in which the coil is preformed before the wire is inserted. 4.1.41 Partly preformed winding A regular winding in which the coil is preformed before the wire is inserted except for one end, and the other end is formed after the wire is inserted and the coils are connected.
Random wound winding129
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A winding in which the conductors have no specified position in the coil side. 4.1.43 Fed-in winding A winding (usually a random wound winding) in which the conductors of the coil side are inserted into the slot from the notch. 4.1.44 Push-through winding A winding in which the coil side is inserted axially into the slot and then the other end is formed and connected. 4.1.45 Pull-through winding A winding in which the coil is pulled axially into the slot.
4.1.46 Integral slot winding A type of distributed winding in which the number of slots per pole per phase is an integer and the number of slots per pole is the same. 4.1.47 Fractional slot winding A type of distributed winding in which the number of slots per pole per phase is not an integer. For example: 3% slots per pole per phase. 4.1.48 Pole changing winding A type of winding in which the lead wires of two or more coil groups are connected to terminals and the number of poles of the winding can be changed by changing the way the terminals are connected to each other.
4.1.49 Pole amplitude modulated winding A type of pole changing winding in which the pole ratio is not an integer by suppressing or strengthening the magnetic field harmonics. 4.1.50 Primary circuit A circuit in an induction motor that is connected to the external power system when the motor is running to absorb or send active power. 4.1.51
Secondary circuit
A circuit in an induction motor that is not connected to the external power system when the motor is running. 4.1.52
Armature circuit
A circuit in a synchronous, DC or single-phase commutator motor that is connected to the external power system when the motor is running to absorb or send active power.
4.2 Winding structure
4.2.1 Turn
A conductor or a group of conductors that form a coil.
Note: The conductor may be multiple strands or multiple layers. Each strand or layer may be in the shape of a wire, rod, ribbon or strip depending on the cross-sectional shape. It may be uninsulated or insulated to reduce eddy current losses.
4.2.2 Coil section
A basic unit of winding consisting of turns or multiple turns insulated from each other. Coil
An assembly of one or more coil units, usually with common insulation. 4.2.4 Multi-section coil A coil consisting of two or more coil units or groups of turns, each of which is insulated. Half-coil, bar
Any half of the entire coil, each with a coil side and corresponding ends, put together to form a complete coil. Note: Usually half of a single-turn coil of a large motor is called a bar. 4.2.6 Coil side
Any of the two straight sections of the coil along the axis of the motor. 4.2.7 End winding
The connecting section connecting the two coil sides.
4.2.8 Winding overhang The section of the winding that extends beyond the ends of the core. 130
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4.2.9 Coil side slot portion The portion of the coil side embedded in the slot, that is, the portion between the two end faces of the core. 4.2.10 Open-ended coil A partially formed coil whose turns are open at one end to facilitate the insertion of the wire. Hairpin coil
A special form of open coil used to insert into a semi-closed slot or a closed slot. 4.2.12 Field coil fieldcoil
a A coil with appropriate insulation for DC and AC salient pole motors, mounted on a magnetic pole for excitation, a group of turns occupying a pair of slots in the field winding of a cylindrical rotor synchronous motor. b.
4.2.13 Tier
Terminology describing the state of the end of a concentric winding. The layers of the coil group end around the motor axis may have one, two or three layers, depending on the coil arrangement.
cranked coil
A coil with a special shape at the end of the winding, whose end can cross from one layer to another. Dummy coil
A coil in the winding, which is not electrically connected to the winding loop and is only set up for the need of mechanical balance. Note: Dead coils that are allowed to be connected to the circuit in the future should be explained. For example: the third phase winding originally connected to a single-phase motor. 4.2.16 equalizer
A connecting line between certain points in the winding, used to reduce the potential difference that should not exist between these points. Tap
A terminal connected to certain intermediate points of the winding. 4.2.18t
Tooth pitch
The circumferential distance between two points at corresponding positions on two adjacent teeth. Coil pitch coil span;coil pitch4.2.19
The number of tooth pitches between the slots where the two sides of a coil are located. 4.2.20
Front span
The pitch of the coil at the connected end of the winding.
Backspan
The pitch of the coil at the non-connected end of the winding.
Pole pitch
The circumferential distance between corresponding points on two adjacent magnetic poles, usually expressed in the number of tooth pitches. Winding pitch
The ratio of the coil pitch to the pole pitch, usually expressed as a percentage. 4.2.24
full pitch winding
Winding with 100% pitch.
short pitch winding
Winding with less than 100% pitch.
4.2.26long pitch windingWinding with more than 100% pitch.
4.2.27commutator pitchThe number of commutator segments between the beginning and the end of a single coil unit. 4.2.28transposition
One or more conductors constituting a coil or winding, such as a multi-strand or multi-layer composite conductor, in which the strands are changed to reduce eddy current losses.
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