JB/T 7561-2002 Technical Specifications for WZ Series Eddy Current Brakes for Hoisting and Metallurgy
Some standard content:
ICS29.160.30
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4 在6 4
2002-07-164
JB/T75612002
JB/T756191994
2002-12-01
This standard replaces JB7561-1994 "Technical conditions for WZ series eddy current brakes for lifting and metallurgical use". The main changes of this standard compared with JB7561-1994 are as follows: Changed from a mandatory industry standard to a recommended industry standard: The referenced standards are all the latest versions:
- Added numerical rounding rules.
Appendix A of this standard is a normative appendix
This standard is proposed by China Machinery Industry Federation JB/T7561—2002
This standard is under the jurisdiction of the National Technical Committee for Standardization of Rotating Electric Machines, Hoisting Metallurgy and Shielded Motor Standardization Technical Committee (SAC/TC26/SC4).
The responsible drafting unit of this standard: Jiamusi Explosion-proof Motor Research Institute, Jiamusi Electric Motor Co., Ltd. The main drafters of this standard: Tan Yulin, Zhao Guoyan, Yang Hailong, Wei Min. The previous versions of the standards replaced by this standard are: ——JB/DQ3198-1987:
JB7561—1994.
1 Scope
Technical conditions for WZ series eddy current brakes for lifting and metallurgy
JB/T7561-2002
This standard specifies the types, basic parameters and dimensions of WZ series eddy current brakes for lifting and metallurgy. Technical requirements, inspection rules, marking and packaging requirements.
This standard applies to eddy current brakes for speed regulation of wound rotor three-phase asynchronous motors in various lifting machinery and metallurgical auxiliary equipment. 2 Normative references
The clauses in the following documents become the clauses of this standard through reference in this standard. For any dated referenced document, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, the parties who reach an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, its latest version applies to this standard. GB/T191-2000 Packaging, storage and transportation pictorial symbols (evISO780:1997) GB7552000 Rotating motor ratings and performance (idtEC60034-1:1996) GB/T997-1981 Motor structure and installation type code (neqEC60034-7:1972) GB/T1032-1985 Three-phase asynchronous motor test methods GB/T1096-1979 Ordinary flat key type dimensions GB/T1993-1993 Rotating motor cooling methods GB/T4772.1-1999 Rotating motor dimensions and output power levels Part 1: Frame size 56~~400 and flange size 551080 (idtIEC60072-1:1991)
GB/T4942.1—2001
Protection classification of rotating electrical machine housing (IP code) (idr positive C60034-5:1991) JB/T10105-1999 Technical conditions for YZR series wound rotor phase asynchronous motors for hoisting and metallurgy 3 Terms and definitions
Rated braking torque
The braking torque of the eddy current brake at 100r/min and when the excitation winding is thermally stable. 3.2
Limited braking torque
The braking torque of the eddy current brake at 950r/min1000r/min and when the excitation winding is thermally stable. 3.3
Rated excitation current
The excitation current that can meet the rated braking torque. 4. Type, basic parameters and dimensions
4.1 The enclosure protection level of the eddy current brake is IP23, and the protection level of the junction box is P44 (see GB/T4942.1-2001). 4.2 The cooling method of the eddy current brake is IC411 (see GB/T1993-1993). The structure and installation type of the eddy current brake is IM100I (see GB/T997-1981). 4.3
The standard working system of the eddy current brake is S3, the standard load duration is 15%, and each working cycle is 10 minutes. 4.4
JB/T7561—2002
4.5 The rated braking torque of the eddy current brake at the rated speed of 100r/min is manufactured according to the following values: 64Nm, 118N·m, 170N·m, 245N·m, 390N·m, 620N-m, 980N·m, 1180N·m, 1700N·m, 1860N·m, 2250N·m.4.6 The rated braking torque, limited braking torque, moment of inertia of the eddy current brake and the matching relationship with the wound rotor motor (see JB/T101051999) shall comply with the provisions of Table 1.
Rated
Frame
Torque
Limited
Torque
Maximum
speed
kg·m?
Frame
Matching wound rotor motor kw
1000r/min
750r/min
600r/min
4.7 The power supply of the eddy current brake excitation winding is DC. At the rated excitation current, the excitation voltage is 80V±15V, and can also be made into 160V±30V.
4.8 The structure and installation type of the eddy current brake is IM1001. The installation dimensions and tolerances shall comply with the provisions of Table 2 (see GB/T4772.1-1999), and the overall dimensions shall not exceed the provisions of Table 2. 4.9 The dimensions and tolerances of the eddy current brake shaft extension key shall comply with the provisions of Table 3 (see GB/T1096-1979). The symmetry tolerance of the eddy current brake shaft extension keyway shall not exceed the provisions of Table 4. 4.10
The radial runout tolerance at half the length of the eddy current brake shaft extension shall not exceed the provisions of Table 5. 4.12
The parallelism tolerance of the eddy current brake axis to the foot support surface shall not exceed the provisions of Table 6. The flatness tolerance of the eddy current brake foot support surface shall not exceed the provisions of Table 7. 4.13
If the position of the X hole is qualified, A/2 can be exempted from the assessment. An
Position
Unit: mm
Overall dimensions
JB/T7561-2002
JB/T7561—2002
Shaft extension diameter D
Shaft extension diameter D
42~-50
>50~80
>80~110
Unit: mm
Unit: mm
Symmetrical tolerance
Unit: mm
Radial runout tolerance
Shaft center height
160~~250
>250~315
>315~400
Maximum dimension of the outer edge distance of the foot (AB or BB) 250-~400
>400~630
>630～100
5 Technical requirements
Parallelism tolerance
Flatness tolerance
JB/T7561---2002
Unit: mm
Unit: mm
Eddy current brakes shall comply with the requirements of this standard and shall be manufactured in accordance with the drawings and technical documents approved by the prescribed procedures. 5.1
5.2 Eddy current brakes shall be able to operate at rated speed when used under the following conditions. 5.2.1 The altitude shall not exceed 1000m. If the eddy current brake is specified to be used at an altitude exceeding 1000m, it shall be handled in accordance with the provisions of GB755-2000.
5.2.2 The maximum ambient air temperature varies with the seasons. The general environment shall not exceed 40℃, and the metallurgical environment shall not exceed 60℃. If the eddy current brake is specified to be used in an ambient air temperature higher or lower than the above provisions, it shall be handled in accordance with the provisions of GB755-2000. 5.2.3 Speed regulation of various indoor lifting machinery and metallurgical auxiliary equipment electrical transmission. 5.2.4 Frequent mechanical vibration and impact.
5.3 The insulation level of eddy current brakes is divided into two types: F and H. F-class insulated eddy current brakes are suitable for places where the ambient air temperature does not exceed 40℃, and H-class insulated eddy current brakes are suitable for places where the ambient air temperature does not exceed 60℃. When the altitude and ambient air temperature meet 5.2.1 and 5.2.2, the temperature rise limit and allowable temperature of each heating part of the eddy current brake shall not exceed the provisions of Table 8, and the numerical rounding interval is 1.
Heating part of eddy current brake
Temperature rise of excitation winding (resistance method)
Allowable bearing temperature (thermometer method)
Maximum armature surface temperature (thermometer method)F-class insulation
(ambient air temperature 40℃)
150℃
H-class insulation
(ambient air temperature 60℃)
115℃
150℃
Note: The allowable bearing temperature refers to the value at the ambient air temperature specified in 5.2.2. When measured at a temperature lower than the ambient air temperature, the bearing temperature should be the difference between the measured temperature plus the specified ambient air temperature and the actual ambient temperature. 5.4 The eddy current brake shall be able to withstand the overspeed test of the maximum speed specified in Table 1 for 2 minutes without excitation current, and the armature shall not be subject to harmful deformation.
JB/T7561-—2002
5.5 The insulation resistance of the eddy current brake excitation winding shall not be less than 1MQ after the hot state or temperature rise test. 5.6 The eddy current brake excitation winding shall be able to withstand the insulation withstand voltage test for 1 minute without breakdown. The frequency of the test voltage is 50Hz, and it shall be a sinusoidal AC voltage as much as possible. The effective value of the test voltage is 1500V plus 2 times the rated excitation voltage. 5.7 The armature of the eddy current brake shall be balanced with an internal fan. The unevenness of the air gap between the armature and the magnetic pole of the eddy current brake shall not exceed the requirements of Table 9. 5.8
Basic size of the air gap:
In the table:-
The unevenness of the air gap is defined as:
2y +8+898,8 -8,8,-8,6
Among them: 5, 52, 53 are the air gap values measured at a distance of 120″1.00
5.9 The eddy current brake is a cylindrical single-axis extension. When the two parties have another agreement, it is allowed to be made into a double-axis extension for the installation of a tachometer generator or a speed limit switch.
The eddy current brake is connected to the motor with a coupling. 5.10
The eddy current brake has two wiring terminals. The terminal box is located on the top of the base and can be connected to the wires on both sides. 5.11
5.12 The eddy current brake should have an obvious grounding device on the base. 5.13 All fasteners of the eddy current brake must have anti-loosening measures. 5.14 Eddy current brake shaft extension flat key, use and maintenance instructions (At least one copy shall be provided for a batch of eddy current brakes of the same user and the same model) and the product certificate shall be provided to the user together with the eddy current brake. 5.15 If the user uses and stores the eddy current brake correctly in accordance with the provisions of the operating and maintenance instructions, the manufacturer shall ensure that the eddy current brake can operate well within one year of use, but not more than two years from the date of shipment from the manufacturer. If the eddy current brake is damaged or fails to work properly due to poor manufacturing quality within the specified time, the manufacturer shall repair or replace parts or eddy current brakes for the user free of charge.
6 Inspection rules
6.1 Each eddy current brake must be inspected and qualified before it can leave the factory, and it shall be accompanied by a product certificate . 6.2 Each eddy current brake must be inspected and tested. The inspection and test items include: 6.2.1 Mechanical inspection. The mechanical inspection items include: a) Rotation inspection: When the eddy current brake rotates, it should be smooth and light without stagnation: the sound should be even and harmonious without harmful noise. b) Appearance inspection: Check whether the eddy current brake is assembled completely and correctly. The surface paint should be completely dry, without defects such as stains, damage and cracks.
c) Inspection of installation dimensions, overall dimensions and key dimensions. Inspection of the flatness of the base support surface, the parallelism of the axis to the base support surface, the symmetry of the keyway, and the radial runout of the shaft extension. The flatness of the base support surface and the symmetry of the keyway are allowed to be inspected on the components. 6.2 .2 Determination of insulation resistance of the field winding to the housing and pole core (the cold insulation resistance can be measured during the inspection test, but the insulation resistance in the hot state should be no less than the provisions of 5.5). 6.2.3 Determination of DC resistance of the field winding under actual cooling state 6
6.2.4 Test of insulation strength between turns of the field winding. 6.2.5 Determination of braking torque at 100r/min and rated excitation current. JB/T7561—2002
6.2.66.2.1a) and b) must be inspected for each unit, c) and d) and 6.2.5 can be spot checked, and the spot check method shall be carried out by the manufacturer in accordance with relevant regulations. 6.3 In any of the following situations, a type test must be carried out. a) The manufacturer's first trial production or small-batch trial production after identification and finalization; b) When the design or process changes are sufficient to cause changes in certain performance and parameters; c) When the inspection test results deviate unacceptably from the previous type test results: Eddy current brakes produced in batches should be regularly inspected, and the inspection time should be at least once a year. d
6.4 The type test items of eddy current brake include: all items of inspection test:
b) Temperature rise test;
Determination of mechanical characteristic curve, which should be measured separately: 0.25I, 0.51, 0.75/, 1.01, 1.251, 1.5/, a total of 6 curves:c)wwW.bzxz.Net
d) Determination of air gap unevenness:
Determination of moment of inertia:
f) Overspeed test;
g) Determination of rated excitation voltage:
h) Determination of limited braking torque and excitation current of eddy current brake (the measurement time shall not exceed 15s:: 6.56.2.2~6.2.4 and 6.4 b), f), g) shall be carried out in accordance with GB/T1032-1985. 6.6.2.1 The inspection method for the installation dimensions and tolerances specified in GB/T4772.1-1999 shall be carried out. 6.6
The test method for the protection level of the eddy current brake housing shall be carried out in accordance with GB/T4942.1-2001. 6.7
The measurement method for the braking torque and mechanical characteristic curve of the eddy current brake shall be carried out in accordance with Appendix A. 6.8
Marking and packaging
The nameplate material and the engraving method of the data on the nameplate shall ensure that the handwriting is not easily erased during the entire service period of the eddy current brake. Viewed from the shaft extension end, the nameplate should be fixed on the upper right half of the machine base, and the items to be marked are as follows: Manufacturer name:
Eddy current brake name;
Eddy current brake model:
Rated braking torque, in N·m:
Limited braking torque, in N·m:
Rated excitation voltage, in V;
Rated excitation current, in A;
Rated speed, in r/min;
Benchmark working system:
Insulation grade;
Ambient air temperature, in;
Protection grade;
m) Moment of inertia, in kg·m2:
n) Mass, in kg:
o) Standard number:
p) Production number:
q) Year and month of production.
7.3 The shaft extension key of the eddy current brake must be tied to the shaft, and the shaft extension and key surface should be rust-proof and protected.9 The eddy current brake is a cylindrical single shaft extension. If the two parties agree otherwise, it is allowed to be made into a double shaft extension for the installation of a speed measuring generator or a speed limit switch.
The eddy current brake is connected to the motor with a coupling. 5.10
The eddy current brake has two wiring terminals. The terminal box is located at the top of the base and can be wired in both directions. 5.11
5.12 The eddy current brake should have an obvious grounding device on the base. 5.13 All fasteners of the eddy current brake must have anti-loosening measures. 5.14 The shaft extension flat key, operation and maintenance instructions (at least one copy is provided for a batch of eddy current brakes of the same user and the same model) and product certificate of the eddy current brake should be provided to the user together with the eddy current brake. 5.15 If the user uses and stores the eddy current brake correctly in accordance with the provisions of the operation and maintenance instructions, the manufacturer should ensure that the eddy current brake can operate well within one year of use, but no more than two years from the date of shipment from the manufacturer. If the eddy current brake is damaged or fails to work properly due to poor manufacturing quality within the specified time, the manufacturer shall repair or replace parts or eddy current brakes for the user free of charge.
6 Inspection rules
6.1 Each eddy current brake must be inspected and qualified before it can be shipped, and a product certificate shall be attached. 6.2 Each eddy current brake must be inspected and tested, and the inspection and test items include: 6.2.1 Mechanical inspection, mechanical inspection items include: a) Rotation inspection: When the eddy current brake rotates, it should be smooth and light, without stagnation: the sound is even and harmonious without harmful noise. b) Appearance inspection: Check whether the eddy current brake is assembled completely and correctly, and the surface paint should be completely dry without defects such as stains, damage and cracks.
c) Inspection of installation dimensions, external dimensions and key dimensions. Inspection of the flatness of the foot support surface, the parallelism of the axis to the foot support surface, the symmetry of the keyway, and the radial runout of the shaft extension. The flatness of the bottom d
foot support surface and the symmetry of the keyway are allowed to be checked on the parts. 6.2.2 Determination of the insulation resistance of the excitation winding to the housing and the pole core (the cold insulation resistance can be measured during the inspection test, but the insulation resistance in the hot state should be guaranteed not to be lower than the provisions of 5.5). 6.2.3 Determination of the DC resistance of the excitation winding under the actual cooling state 6
6.2.4 Inter-turn insulation strength test of the excitation winding. 6.2.5 Determination of the braking torque at 100r/min and rated excitation current. JB/T7561—2002
6.2.66.2.1a) and b) must be checked for each unit, c) and d) and 6.2.5 can be spot checked, and the spot check method shall be carried out by the manufacturer in accordance with relevant regulations. 6.3 In any of the following situations, a type test must be carried out. a) The manufacturer's first trial production or small-batch trial production after identification and finalization; b) When the design or process changes are sufficient to cause changes in certain performance and parameters; c) When the inspection test results deviate unacceptably from the previous type test results: Eddy current brakes produced in batches should be regularly inspected, and the inspection time should be at least once a year. d
6.4 The type test items of eddy current brake include: All items of inspection test:
b) Temperature rise test;
Determination of mechanical characteristic curve, which should be measured separately: 0.25I, 0.51, 0.75/, 1.01, 1.251, 1.5/, a total of 6 curves:c)
d) Determination of air gap unevenness:
Determination of moment of inertia:
f) Overspeed test;
g) Determination of rated excitation voltage:
h) Determination of limited braking torque and excitation current of eddy current brake (the measurement time shall not exceed 15s:: 6.56.2.2~6.2.4 and 6.4 b), f), g) shall be carried out in accordance with GB/T1032-1985. 6.6.2.1 The inspection method for the installation dimensions and tolerances specified in GB/T4772.1-1999 shall be carried out. 6.6
The test method for the protection level of the eddy current brake housing shall be carried out in accordance with GB/T4942.1-2001. 6.7
The measurement method for the braking torque and mechanical characteristic curve of the eddy current brake shall be carried out in accordance with Appendix A. 6.8
Marking and packaging
The nameplate material and the engraving method of the data on the nameplate shall ensure that the handwriting is not easily erased during the entire service period of the eddy current brake. Viewed from the shaft extension end, the nameplate should be fixed on the upper right half of the machine base, and the items to be marked are as follows: Manufacturer name:
Eddy current brake name;
Eddy current brake model:
Rated braking torque, in N·m:
Limited braking torque, in N·m:
Rated excitation voltage, in V;
Rated excitation current, in A;
Rated speed, in r/min;
Benchmark working system:
Insulation grade;
Ambient air temperature, in;
Protection grade;
m) Moment of inertia, in kg·m2:
n) Mass, in kg:
o) Standard number:
p) Production number:
q) Year and month of production.
7.3 The shaft extension key of the eddy current brake must be tied to the shaft, and the shaft extension and key surface should be rust-proof and protected.9 The eddy current brake is a cylindrical single shaft extension. If the two parties agree otherwise, it is allowed to be made into a double shaft extension for the installation of a speed measuring generator or a speed limit switch.
The eddy current brake is connected to the motor with a coupling. 5.10
The eddy current brake has two wiring terminals. The terminal box is located at the top of the base and can be wired in both directions. 5.11
5.12 The eddy current brake should have an obvious grounding device on the base. 5.13 All fasteners of the eddy current brake must have anti-loosening measures. 5.14 The shaft extension flat key, operation and maintenance instructions (at least one copy is provided for a batch of eddy current brakes of the same user and the same model) and product certificate of the eddy current brake should be provided to the user together with the eddy current brake. 5.15 If the user uses and stores the eddy current brake correctly in accordance with the provisions of the operation and maintenance instructions, the manufacturer should ensure that the eddy current brake can operate well within one year of use, but no more than two years from the date of shipment from the manufacturer. If the eddy current brake is damaged or fails to work properly due to poor manufacturing quality within the specified time, the manufacturer shall repair or replace parts or eddy current brakes for the user free of charge.
6 Inspection rules
6.1 Each eddy current brake must be inspected and qualified before it can be shipped, and a product certificate shall be attached. 6.2 Each eddy current brake must be inspected and tested, and the inspection and test items include: 6.2.1 Mechanical inspection, mechanical inspection items include: a) Rotation inspection: When the eddy current brake rotates, it should be smooth and light, without stagnation: the sound is even and harmonious without harmful noise. b) Appearance inspection: Check whether the eddy current brake is assembled completely and correctly, and the surface paint should be completely dry without defects such as stains, damage and cracks.
c) Inspection of installation dimensions, external dimensions and key dimensions. Inspection of the flatness of the foot support surface, the parallelism of the axis to the foot support surface, the symmetry of the keyway, and the radial runout of the shaft extension. The flatness of the bottom d
foot support surface and the symmetry of the keyway are allowed to be checked on the parts. 6.2.2 Determination of the insulation resistance of the excitation winding to the housing and the pole core (the cold insulation resistance can be measured during the inspection test, but the insulation resistance in the hot state should be guaranteed not to be lower than the provisions of 5.5). 6.2.3 Determination of the DC resistance of the excitation winding under the actual cooling state 6
6.2.4 Inter-turn insulation strength test of the excitation winding. 6.2.5 Determination of the braking torque at 100r/min and rated excitation current. JB/T7561—2002
6.2.66.2.1a) and b) must be checked for each unit, c) and d) and 6.2.5 can be spot checked, and the spot check method shall be carried out by the manufacturer in accordance with relevant regulations. 6.3 In any of the following situations, a type test must be carried out. a) The manufacturer's first trial production or small-batch trial production after identification and finalization; b) When the design or process changes are sufficient to cause changes in certain performance and parameters; c) When the inspection test results deviate unacceptably from the previous type test results: Eddy current brakes produced in batches should be regularly inspected, and the inspection time should be at least once a year. d
6.4 The type test items of eddy current brake include: All items of inspection test:
b) Temperature rise test;
Determination of mechanical characteristic curve, which should be measured separately: 0.25I, 0.51, 0.75/, 1.01, 1.251, 1.5/, a total of 6 curves:c)
d) Determination of air gap unevenness:
Determination of moment of inertia:
f) Overspeed test;
g) Determination of rated excitation voltage:
h) Determination of limited braking torque and excitation current of eddy current brake (the measurement time shall not exceed 15s:: 6.56.2.2~6.2.4 and 6.4 b), f), g) shall be carried out in accordance with GB/T1032-1985. 6.6.2.1 The inspection method for the installation dimensions and tolerances specified in GB/T4772.1-1999 shall be carried out. 6.6
The test method for the protection level of the eddy current brake housing shall be carried out in accordance with GB/T4942.1-2001. 6.7
The measurement method for the braking torque and mechanical characteristic curve of the eddy current brake shall be carried out in accordance with Appendix A. 6.8
Marking and packaging
The nameplate material and the engraving method of the data on the nameplate shall ensure that the handwriting is not easily erased during the entire service period of the eddy current brake. Viewed from the shaft extension end, the nameplate should be fixed on the upper right half of the machine base, and the items to be marked are as follows: Manufacturer name:
Eddy current brake name;
Eddy current brake model:
Rated braking torque, in N·m:
Limited braking torque, in N·m:
Rated excitation voltage, in V;
Rated excitation current, in A;
Rated speed, in r/min;
Benchmark working system:
Insulation grade;
Ambient air temperature, in;
Protection grade;
m) Moment of inertia, in kg·m2:
n) Mass, in kg:
o) Standard number:
p) Production number:
q) Year and month of production.
7.3 The shaft extension key of the eddy current brake must be tied to the shaft, and the shaft extension and key surface should be rust-proof and protected.4 b), f), g) shall be carried out in accordance with GB/T1032-1985. The inspection method for the installation dimensions and tolerances specified in 66.2.1 shall be carried out in accordance with GB/T4772.1-1999. 6.6
The test method for the protection level of the eddy current brake housing shall be carried out in accordance with GB/T4942.1-2001. 6.7
The measurement method for the braking torque and mechanical characteristic curve of the eddy current brake shall be carried out in accordance with Appendix A. 6.8
Marking and packaging
The nameplate material and the engraving method of the data on the nameplate shall ensure that the handwriting is not easily erased during the entire service period of the eddy current brake. Viewed from the shaft extension end, the nameplate should be fixed on the upper right half of the machine base, and the items to be marked are as follows: Manufacturer name:
Eddy current brake name;
Eddy current brake model:
Rated braking torque, in N·m:
Limited braking torque, in N·m:
Rated excitation voltage, in V;
Rated excitation current, in A;
Rated speed, in r/min;
Benchmark working system:
Insulation grade;
Ambient air temperature, in;
Protection grade;
m) Moment of inertia, in kg·m2:
n) Mass, in kg:
o) Standard number:
p) Production number:
q) Year and month of production.
7.3 The shaft extension key of the eddy current brake must be tied to the shaft, and the shaft extension and key surface should be rust-proof and protected.4 b), f), g) shall be carried out in accordance with GB/T1032-1985. The inspection method for the installation dimensions and tolerances specified in 66.2.1 shall be carried out in accordance with GB/T4772.1-1999. 6.6
The test method for the protection level of the eddy current brake housing shall be carried out in accordance with GB/T4942.1-2001. 6.7
The measurement method for the braking torque and mechanical characteristic curve of the eddy current brake shall be carried out in accordance with Appendix A. 6.8
Marking and packaging
The nameplate material and the engraving method of the data on the nameplate shall ensure that the handwriting is not easily erased during the entire service period of the eddy current brake. Viewed from the shaft extension end, the nameplate should be fixed on the upper right half of the machine base, and the items to be marked are as follows: Manufacturer name:
Eddy current brake name;
Eddy current brake model:
Rated braking torque, in N·m:
Limited braking torque, in N·m:
Rated excitation voltage, in V;
Rated excitation current, in A;
Rated speed, in r/min;
Benchmark working system:
Insulation grade;
Ambient air temperature, in;
Protection grade;
m) Moment of inertia, in kg·m2:
n) Mass, in kg:
o) Standard number:
p) Production number:
q) Year and month of production.
7.3 The shaft extension key of the eddy current brake must be tied to the shaft, and the shaft extension and key surface should be rust-proof and protected.
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