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National Standard of the People's Republic of China
Electric Motor Terminal Marking and Direction of Rotation
GB1971-80
National Standard of the People's Republic of China
Electric Motor Terminal Marking and Direction of Rotation
GB197180
Replaces Part 755-65
This standard applies to terminal marking of AC motors and DC commutator motors; direction of rotation; relationship between terminal marking and direction of rotation. 1. Terminal markings are composed of letters and numbers (1) Windings are distinguished by capital letters. That is, A, B, C, D, E...U, V, W, X, Y, Z, a total of 26 letters (2) Winding terminals, whether at the end or at the intermediate points, are distinguished by numbers immediately following the winding letters. For example, U1, U2, L3. (3) When the same type of windings are marked with the same letters, a number is placed before the winding letter to distinguish them. Such as 1U, 2U, 1V, 2V, iW, 2W.
(4) For DC windings, use the first part of the alphabetical order. For AC windings, use the second part of the alphabetical order. If there is no confusion, the numbers before and after the winding letters can be omitted.
2. Terminal marking of AC motors
(1) The terminals of the three-phase stator windings of synchronous and asynchronous motors should be marked as follows (see Figures 1 to 12): Vi
Figure 1 Single winding,
6 terminals
Figure 2 Tap winding, 12 terminals
Note: *Here it is assumed that the primary wire is on the stator. If the primary is on the rotor, the letters U, V, W, N are used for the rotor winding, and the letters K, L, M, Q are used for the stator winding.
Bureau issued
The First Ministry of Machinery Industry of the People's Republic of China proposed the construction of 321-
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Drafted by Shanghai Electric Science Research Institute of the First Ministry of Machinery Industry
Total 8 pages Page 2
GB1971-80
Figure 3 Windings for series and parallel connection, 12 line terminals The numbers in Figure 3 that are disconnected in sequence of 1, 2, 5, and 6 are to distinguish them from the tapped windings in Figure 2. 1U1
Figure 4 A pair of windings that are not for series and parallel connection, each with 6 line terminals
For double-speed pole-changing motors, double windings, the leading digits are used to distinguish high speed and low speed. Figure 5 Delta winding, 3 wire ends
Figure 6 Delta winding, 4 wire ends
Power supply end
GB197180
External parallel wire
At low speed: 1W, 1V, 1U are connected to the power supply, at this time the winding is a series star
Power supply circuit
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At high speed: 2U, 2V, 2W are connected to the power supply, 1W, 1V, 1U are parallel, at this time the winding is a parallel star
Figure shows dual-speed winding, 6 wire ends
1. The leading digit of the wire end connected to the power supply is used to distinguish high speed and low speed. 2.. The relationship between the order of the wire ends and the direction of rotation is shown in 5 (1). Power coupon
Power supply terminal
At low speed: 1W, 1V, 1U are connected to the power supply, at this time the winding is a series triangle
External parallel line
At high speed: 2U, 2V, 2W are connected to the power supply, 1U, 1V, 1W are parallel, at this time the winding is a parallel star
Figure 8 Dual-speed winding, 6 line terminals
1, the leading digit of the line terminal connected to the power supply is used to distinguish high speed and low speed. 2. The relationship between the order of the line terminal letters and the direction of rotation is shown in 5 (1.) Building 321
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GB1971—80
External parallel wire
Figure 9 Two sets of windings of the pole-changing three-speed motor, one of which is the same as Figure 8, can obtain the highest and lowest speeds, and the other set of independent windings produces the middle three speeds, a total of 9 line ends. The leading digits are in the same order as the speeds (2) The three-phase winding line end markings of the rotor of the wound-rotor asynchronous motor* are replaced as follows according to the stator line end markings: U is replaced by K
V is replaced by L
W is replaced by M
N is replaced by Q
Note: *Here it is assumed that the primary winding is on the stator. If the primary winding is on the rotor, the U, V, W, N and K, L, M, Q markings on the stator and rotor should be swapped.
（3）The two-phase winding terminal markings are derived from the three-phase winding terminal markings, and the letters W and M can be removed. (4) The single-phase winding terminal markings are:
Figure 10 Single-phase motor main winding
Figure 11 Single-phase motor auxiliary winding
（5）The synchronous motor DC excitation winding terminal markings (Figure 12) refer to the DC excitation winding terminal markings (Figure 21). Fo
Figure 12 Synchronous motor DC excitation winding with two terminal 3. Wire terminal markings for DC commutator motors
GB197180
(1) Wire terminal markings for DC commutator motor windings are shown in Figure 13-24:flo
Figure 13 has two wire terminals for the armature winding
Figure 15 has four wire terminals, divided into two groups of commutation windings (connected on both sides of the armature)
Figure 17 has four wire terminals, divided into two groups of compensation windings (connected on both sides of the armature)
Figure 19 has four wire terminals, of which Two
Separately connected excitation windings
FiooF2
Figure 21 A separately connected excitation winding with two wire ends
Figure 23 A direct-axis auxiliary winding with two wire ends
Figure 14 A commutation winding with two wire ends
Figure 16 A compensation winding with two wire ends
Total 8 pages Page 5
Figure 18 A series-connected excitation winding with two wire ends
Figure 20 A parallel-connected excitation winding with two wire ends
Froo F2
Fs oo Fe
Figure 22 has 4 wire ends for the parallel excitation winding Jo
Figure 24 has 2 wire ends for the horizontal axis auxiliary winding
(2) For the two sets of excitation windings, if the magnetic strength is superimposed, the current should flow from the high end to the low end, or from the low end to the high end.
(3) Between the commutation winding and the compensation winding, and between them and the armature winding, if the current in these windings flows from the high end to the low end, or from the low end to the high end, then all polarities will be correct. (4) When the armature winding is connected in series with the commutation winding and the compensation winding and two wire ends are drawn out, the marking method is shown in Figures 25 to 28: A2
Figure 25 has two wire ends, the armature and commutation windings are connected in series with the commutation windings. ne
Total 8 pages Page 6
GB1971—80
(1B2）
(2B1）
Figure 26 has two wire ends, the armature is between two sets of commutation windings A2)
Figure 27 has two wire ends, the armature is connected in series with the commutation winding and the compensation winding (AI
(1C2)(1B1)(1B2)
.42）
(2B1)(2B2)(2C1)
Figure 28 has two wire ends, the armature is between two sets of commutation windings and the compensation winding Note: If the commutation winding and the compensation winding are interlaced, the wire ends should be marked with a single C. See Figure 29. (5) If more than two windings are connected to the same terminal, the terminal markings shall be derived from the terminal markings of the connected windings, as shown in Figures 29 to 32.
Note: The direction of rotation shown in Figures 29 to 32 shall be handled in accordance with Section 5 (3). o
Figure 29 has two terminals, with a shunt-excited motor or generator alternately connected with a commutation winding and a compensating winding. Direction of rotation: clockwise (E1)
(E2)
(B1)
(B2)(CI)(C2)
Figure 30 has two terminals, with a shunt-excited motor or generator with a commutation winding and a compensating winding in the middle. Direction of rotation: counterclockwise 4. Direction of rotation
GB1971-80
(B1)
Figure 31 has two wire terminals, connected to the optional compound-excited generator with commutation winding and compensation winding. Direction of rotation: clockwise CE
Figure 32 has two wire terminals, connected to the superimposed compound-excited motor with commutation winding. Direction of rotation: clockwise Page 7 of 8
(1) If the motor has only one shaft extension (or two shaft extensions of different diameters), look from the shaft extension end (or from the end of the shaft extension with the larger diameter) to determine its direction of rotation. If the motor has two shaft extensions of the same diameter, or no shaft extension, the person looking at the direction of rotation should stand at; a. If there is a commutator or slip ring at one end, it should be looked at at the other end of the commutator or slip ring; b.If there is a commutator at one end and a collector ring at the other end, the collector ring should be checked; c. If a, b, or other conditions will cause misunderstanding, special regulations should be followed. (2) The direction of rotation is the same as the clockwise direction, which is called clockwise. 5. Relationship between the direction of rotation and the terminal marking
(1) For AC multiphase motors (motors without commutators), when the letter sequence of the phase group terminal is in the same direction as the terminal voltage phase sequence, the motor rotates clockwise. (2) For AC single-phase motors (motors without commutators), if the wiring is as shown in Figure 33, the motor rotates clockwise. (3) For DC commutator motors, if the wiring is as shown in Figures 34, 35, and 36, the motor rotates clockwise. Building 321-
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GB1971-80
Figure 33 Single-phase motor
Figure 34 Shunt motor
Figure 35 Series motor
Note: The voltage polarity at the line terminals of a DC motor connected as shown above has nothing to do with the direction of rotation. E
Figure 36 Series-excited generator
Architecture 321--Standard Query and Download Network
People's Republic of China
National Standard
Motor terminal marking and rotation direction
GB197180
Published by Technical Standards Press
(Beijing Fuwai Sanlihe)
Printed by the Printing Workshop of Technical Standards Press
Distributed by Xinhua Bookstore Beijing Distribution Office Sold by Xinhua Bookstores in various places*
Format 850×11681/16 Printing sheet 3/4 Number of words 15,000 First edition in December 1980
First printing in December 1980
Print run 1-8,500
Book number: 15169·1-831
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Price 0.11 yuan
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