JB/T 6451-1992 General Technical Requirements for Braking Electromagnets JB/T6451-1992 Standard Download Decompression Password: www.bzxz.net

1 Subject content and scope of application
Machinery Industry Standard of the People's Republic of China
General technical requirements for brake electromagnets
JB/T6451-92
This standard specifies the terms, symbols, product classification, basic parameters, normal working conditions and installation conditions, technical requirements, test methods, inspection rules and markings, packaging, transportation and storage of brake electromagnets (hereinafter referred to as electromagnets). This standard is applicable to electromagnets with AC 50Hz, voltage up to 660V and DC voltage up to 440V. It is mainly used to operate block brakes and can also be used for other machinery.
2 Reference standards
National standards
GB2828
GB2900.18
GB4207
JB27 59
JB3284
JB/T2930
3 Terms and symbols
3.1 Terms
General rules for low-voltage switchgear and controlgear
Basic environmental test procedures for electric and electronic productsBasic environmental test procedures for electric and electronic productsTest A: Low temperature test method
Test Db: Alternating damp heat test method
Basic environmental test procedures for electric and electronic productsTest Ea; Impact test methodRemote batch inspectionCounting sampling procedures and sampling tablesElectrical termsLow-voltage electrical appliances
Determination of the tracking index and the withstand tracking index of solid insulating materials under humid conditionsProtection grade of low-voltage electrical enclosures
Glow-wire test method and guidelines
Fire hazard test for electric and electronic products| |tt||General technical conditions for packaging of electromechanical products
Basic environmental conditions and test methods for transportation and storage of motors and electrical products Methods for compiling models of low-voltage electrical products
For terms not specified in this standard, please refer to the relevant terms and their definitions in GB2900.18. 3.1.1 Braking electromagnet braking electro-magnet An electromagnet used for mechanical braking. An electromagnet whose electromagnetic suction is transmitted to the brake mechanism as a driving force through hydraulic pressure is called a hydraulic brake electromagnet. 3.1.2 Leakage current leakage current
Current flowing in a path that should not be energized due to poor insulation. 3.1.3 Holding current (working current) attract current enables the armature of the electromagnetic system to reliably The minimum current to maintain the holding position. 3.1.4 Frequency of operation The maximum number of operating cycles allowed by the electromagnet per hour. 3.1.5 Noise
Any undesirable (sound) signal, in a broad sense, any undesirable interference in the useful band. 3.1.6 Durability of braking-electromagnet Approved by the Ministry of Machinery and Electronics Industry on August 6, 1992, 20
Implemented on January 1, 1993bZxz.net
JB/T6451-92
The number of operating cycles with a specified mechanical load that the electromagnet can withstand before repair or replacement of parts is required when the coil is powered on and off.
3.1.7 Rotative angle
Rotative angle
The angle between the static iron core and the armature of the electromagnet in the open position with the shaft as the rotation center. 3.1.8 Core
The magnetic part of the electromagnet with the wired circle sleeved on it, including the static core and the moving core (armature). 3.1.9 Travel
The output displacement of the working point on the moving part. 3.1.10 Load factor (duration of power-on) on-loadfactor The ratio of the load time of the appliance to the working cycle (the working cycle is the sum of the load time and the no-load time in each operation), usually expressed as a percentage.
3.1.11 Octave
onecotave
The frequency band between two frequencies with a frequency ratio of 2 is called an octave. 3.2 Symbols
The main symbols used in this standard are as follows:
*Rated control power supply voltage
Rated working voltage
Rated insulation voltage
Rated impulse withstand voltage
CTI Comparative tracking index
IP Enclosure protection grade
4 Product classification
4.1 Product model and its meaning
The method for compiling the electromagnet model shall comply with the provisions of JB/T2930. Example: The models and meanings of single-phase, three-phase AC and DC long and short-stroke brake electromagnets are as follows: Mz
Derived code
Variety code
【S--—Waterproof type
H-Protective type or with buffer
Single-phase AC: Rated torque (or equipped brake wheel diameter) when the load factor is specified
DC, three-phase AC: Rated suction when the load factor is specified
Series derived code
Design code: Expressed in Arabic numerals
Single-phase AC
Group code:
Three-phase AC
Class group code: Braking electromagnet
4.2 Type and classification
According to the type of current:
Three-phase AC;
Single-phase AC;
DC.
4.2.2 According to the stroke:
Long stroke (greater than 5mm);
Short stroke (less than or equal to 5mm).
According to the energy transfer method:
Direct transfer (mechanical transfer);
Indirect transfer (hydraulic transfer).
4.3 Installation dimensions and external dimensions
JB/T6451—92
The installation dimensions and external dimensions of the electromagnet should be specified in the specific product standards. 5
Basic parameters
Rated working voltage of the electromagnet
The rated working voltage of the electromagnet is divided into:
220, 380, 660V (for single-phase and three-phase AC electromagnets); a.
b.110 (200), 220 (340), 440 (600) V (for DC electromagnets). Note: The levels in brackets are only applicable to the working voltage of single-phase AC bridge rectifier to DC. 5.2 Electromagnet working system
5.2.1 Eight-hour working system.
5.2.2 Repeated short-time working system; intermittent cycle working system. The load factor of the electromagnet should be divided into:
15%, 25%, 40% and 60%.
5.2.2.2 The operating frequency of the electromagnet (number of operating cycles per hour) should be divided into the following levels: (12 levels)
(30 levels)
120 levels
300 levels
600 levels
1200 levels
(12 times/h)
(30 times/h)
120 times/h
300 times/h
600 times/h
1200 times/h
Note: The levels in brackets are not recommended. 5.3 Rated stroke of the electromagnet
The rated stroke of the electromagnet is recommended to have the following values. Rated stroke parameters of three-phase AC and DC long-stroke brake electromagnets 5.3.1
20, 25, 31.5, 40, 50, 63, 80, 100, 125mm Note: The above levels are R10 numbers.
5.3.2 Rated stroke parameters of DC short-stroke brake electromagnets 2, 2.5, 3.15, 4, 5mm
Note: The above levels are R10 numbers.
5.4 Rotation angle and torque of single-phase AC brake electromagnets The rotation angle and torque of single-phase AC brake electromagnets shall comply with the provisions of Table 1 respectively. The displacement of the brake rod of the brake under the rotation angle shall also be specified in the product manual, see Table 1 for user reference. 22
Brake wheel
JB/T6451—92
Table 1 Single-phase AC brake electromagnet rotation angle and torque and displacement of brake rod under rotation angle Rotation angle
Repeated short-time working system Load factor 40%
Note: The diameter of the brake wheel is used as a reference for product use. 5.5 Suction (thrust) torque of three-phase AC and DC brake electromagnets
Eight-hour work system
The suction (thrust) parameters of three-phase AC and DC brake electromagnets adopt the following values: Displacement of the brake rod of the brake under the rotation angle mm
32, 50, 63, 80, 100, 125, 160, 200, 250, 315, 400, 500, 630, 800, 1000, 1250, 1600, 2000, 2500, 3150N.
Note: ① "Thrust" is used for hydraulic brake electromagnets. ② The above levels are R10 numerical systems.
5.6 Holding current and power of electromagnets
Specific product standards should specify the holding current and power parameters according to their respective characteristics, and should also specify the requirement that "the suction current parameters should be provided in the product manual for reference by users when using it." Note: Specific product standards should select the above parameters according to their own characteristics, and may also add corresponding content or requirements. Normal working conditions and installation conditions
Normal working conditions
Electromagnets that comply with this standard should operate normally under the following specified conditions. 6.1.1 Ambient air temperature:
a. The upper limit is +40°C, and the average value within 24 hours does not exceed +35°C; b. The lower limit is -25°C.
Note: For electromagnets used under the condition that the upper limit of the ambient temperature is higher than +40°C, the technical requirements such as the temperature rise limit, action range, and moisture resistance should be separately specified in the corresponding specific product standards. 6.1.2 Altitude
The altitude of the installation site shall not exceed 2000m.
6.1.3 Atmospheric conditions
The relative humidity of the air at the installation site shall not exceed 50% when the maximum temperature is +40℃. Higher relative humidity is allowed at lower temperatures. The average minimum temperature of the wettest month shall not exceed +25℃, and the average maximum relative humidity of the month shall not exceed 90%. Measures must be taken to prevent condensation on the product due to temperature changes. 6.1.4 Pollution level
The pollution level is level 3 and 4.
6.1.5 Vibration
The severity of external vibration and impact at the installation site shall not exceed the provisions of Articles 7.1.15 and 7.1.16. 6.2 Installation conditions
6.2.1 Installation position
Normal installation conditions shall be specified in the specific product standards and the manufacturer's instructions. Generally, the maximum allowable inclination of the installation position of the electromagnet is 5°.
6.2.2 Installation category
The installation category is II and Class.
7 Technical requirements
JB/T 645192
Electromagnets shall be manufactured in accordance with drawings and technical documents approved by the prescribed procedures. 7.1 Structural requirements
7.1.1 Aging resistance of elastic parts
Elastic parts (such as gaskets, sealing rings, films and screw cap gaskets, etc.) made of rubber, polyvinyl chloride (PVC) or similar materials in electromagnets shall have aging resistance. 7.1.2 Moisture resistance
Unless otherwise specified in the product standard, electromagnets must be able to withstand the severe level of high temperature + 40℃ and 6 cycles of alternating damp heat test specified in GB2423.4.
7.1.3 Heat resistance
Electromagnets shall not be subject to harmful damage at the highest temperature that may be reached under normal working conditions. 7.1.4 Fire hazard test and CTI value determination The structural materials of the electromagnet shall meet the application requirements and shall be able to pass the corresponding tests, such as the fire hazard test, the comparative tracking index (CTI) value determination of the insulating material, etc. 7.1.5 Anti-rust measures
In addition to the pole surface of the electromagnet being coated with rust inhibitor or grease, all its ferrous metal parts including the shell and cover shall have an anti-rust coating (plating) layer, and its quality shall meet the corresponding superior standards. 7.1.6 Electrical clearance
The electromagnet shall adopt the minimum electrical clearance greater than that specified in case B in Table 2. If the minimum electrical clearance less than that specified in case A is adopted, the specified impulse withstand voltage test and its factory sampling test must be carried out (the voltage value shall comply with the provisions of Table 2, and the test requirements and methods are shown in Sections 7.2.3 and 8.17). If the value greater than or equal to the specified value of case A in Table 2 is adopted, the electrical clearance does not need to be subjected to the impulse withstand voltage test. If the product structure does not provide wiring terminals, the minimum value of the electrical clearance between the wiring terminals used by the user to connect the electromagnet should be specified, and its value should comply with the value specified in Case A in Table 2. Table 2 Minimum electrical clearance in air Minimum electrical clearance Determined by the rated voltage of the power system Maximum relative voltage to ground (AC effective value or DC) 100
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