Motor stator direct current resistance testing device

Abstract

The utility model relates to the technical field of motor stator direct-current resistance testing, in particular to a motor stator direct-current resistance testing device which comprises a testing module, a control module and an execution module, and the testing module and the control module are both electrically connected with the execution module. And the execution module is also electrically connected with a U-phase coil, a V-phase coil and a W-phase coil of the motor stator. According to the utility model, the control module can control the execution module to switch to the first test state or the second test state, and the test module can detect the DC resistance of the U-phase coil and the V-phase coil in the first test state. And in the second test state, the test module can detect the direct current resistance of the V-phase coil and the W-phase coil.

Description

Technical Field

[0001] The utility model relates to the technical field of motor stator DC resistance testing, in particular to a motor stator DC resistance testing device. Background Art

[0002] Among the comprehensive motor testing items, one of the tests is the DC resistance test of the motor stator winding package, which requires the use of a DC resistance meter to test the resistance of different stator winding packages. The comprehensive motor testing includes insulation testing, withstand voltage testing, and DC resistance testing. The output ends of these tests are connected together, so there will be 2800V high voltage AC at the stator winding terminal of the motor. Figure 1 In the existing DC resistance test technology, the contactor is used as a high-voltage isolation element to switch and test different stator coils. The contactor contacts and the motor stator coils are connected in series in the circuit to be tested. As a whole, they are the object to be tested. As the number of switching times and the influence of the external environment increase, the contact surface of the contactor contacts oxidizes, and the contact resistance changes, causing the measured resistance to change, affecting the resistance of the stator coil test and making the measurement inaccurate. In addition, in order to realize the switching logic of different stator coils, external wiring is used between the contactors, and the high voltage of the cables causes electromagnetic interference to other circuits and instruments. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the deficiencies in the prior art and provide a device for testing the stator DC resistance of a motor.

[0004] The utility model is realized through the following technical solutions:

[0005] A motor stator DC resistance test device, the test device comprising: a test module, a control module and an execution module, the test module and the control module are both electrically connected to the execution module, and the execution module is also electrically connected to the U-phase wire package, the V-phase wire package and the W-phase wire package of the motor stator;

[0006] The control module can control the execution module to switch to a first test state or a second test state. In the first test state, the test module can detect the DC resistance of the U-phase wire package and the V-phase wire package. In the second test state, the test module can detect the DC resistance of the V-phase wire package and the W-phase wire package.

[0007] Preferably, the execution module includes:

[0008] A first contactor electrically connecting the U-phase line package and the test module;

[0009] A second contactor electrically connecting the V-phase wire package and the test module;

[0010] When the first contactor is closed and the second contactor is closed, the execution module switches to a first test state.

[0011] Preferably, the execution module further includes:

[0012] A third contactor electrically connecting the V-phase wire package and the test module;

[0013] a fourth contactor, electrically connecting the W-phase line package and the test module;

[0014] When the third contactor is closed and the fourth contactor is closed, the execution module switches to the second test state.

[0015] Preferably, the execution module further includes a high-voltage relay, the test module is electrically connected to one contact of the high-voltage relay, and the first contactor, the second contactor, the third contactor, and the fourth contactor are all connected to the other contact of the high-voltage relay;

[0016] When the high-voltage relay is closed, the test module can perform a DC resistance test on the motor stator.

[0017] Preferably, the execution module further includes a circuit board;

[0018] The circuit of the first contactor is arranged on the circuit board; and / or

[0019] The circuit of the second contactor is arranged on the circuit board; and / or

[0020] The circuit of the third contactor is arranged on the circuit board; and / or

[0021] The circuit of the fourth contactor is arranged on the circuit board; and / or

[0022] The circuit of the high voltage relay is arranged on the circuit board.

[0023] Preferably, the circuit board and the motor stator are spaced apart, and the distance of the spaced apart is a first safety distance.

[0024] Preferably, grooves are provided between the wirings on the circuit board, and the grooves are also provided between the terminals on the circuit board, and the width of the grooves is set to the second safety distance.

[0025] Preferably, the wiring line width on the circuit board is set to a safety line width.

[0026] Preferably, a protective layer is provided on the contact surface of the first contactor; and / or

[0027] The contact surface of the second contactor is provided with a protective layer; and / or

[0028] The contact surface of the third contactor is provided with a protective layer; and / or

[0029] The contact surface of the fourth contactor is provided with a protective layer; and / or

[0030] The contact surface of the high voltage relay is provided with a protective layer.

[0031] Preferably, the control module is electrically connected to the first contactor, and the control module can control the on / off state of the first contactor; and / or

[0032] The control module is electrically connected to the second contactor, and the control module can control the on / off state of the second contactor; and / or

[0033] The control module is electrically connected to the third contactor, and the control module can control the on / off state of the third contactor; and / or

[0034] The control module is electrically connected to the fourth contactor, and the control module can control the opening and closing state of the fourth contactor; and / or

[0035] The control module is electrically connected to the high voltage relay, and the control module can control the on / off state of the high voltage relay.

[0036] The beneficial effects of the utility model are:

[0037] In the utility model, the control module can control the execution module to switch to the first test state or the second test state. In the first test state, the test module can detect the DC resistance of the U-phase wire package and the V-phase wire package. In the second test state, the test module can detect the DC resistance of the V-phase wire package and the W-phase wire package.

[0038] Furthermore, the high voltage relay can provide high and low voltage isolation protection for the test module;

[0039] Furthermore, the circuit of the execution module is arranged on a circuit board, and reasonable wiring can prevent the high voltage circuit on the circuit from affecting other circuits and instruments, thereby improving the accuracy of the test;

[0040] Furthermore, a first safety distance is set between the circuit board and the motor stator; grooves are set between the wiring on the circuit board, and grooves are also set between the terminals on the circuit board, and the width of the grooves is set to the second safety distance; the wiring line width on the circuit board is set to the safety line width. Through the above settings, the circuit board can meet the safety withstand voltage requirements;

[0041] Furthermore, a protective layer is provided on the contacts of the contactor and the high-voltage relay, and the protective layer can prevent the contacts from being oxidized, so that the resistance between the contacts is more stable and the test result is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 The invention relates to a control circuit of a DC resistance tester in the prior art.

[0043] Figure 2 It is a schematic diagram of the module connection structure of a motor stator DC resistance testing device provided in this embodiment.

[0044] Figure 3 Schematic diagram of the circuit structure of a motor stator DC resistance testing device provided in this embodiment.

[0045] In the figure: 1. Test module; 11. DC resistance tester; 12. Communication submodule;

[0046] 2. Control module;

[0047] 3. Execution module; 31. First contactor; 32. Second contactor; 33. Third contactor; 34. Fourth contactor; 35. High voltage relay. DETAILED DESCRIPTION

[0048] In order to enable those skilled in the art to better understand the technical solution of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and the best embodiment. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the utility model.

[0049] Reference Figure 2 The utility model provides a motor stator DC resistance testing device, which includes: a testing module 1, a control module 2 and an execution module 3.

[0050] The test module 1 includes a DC resistance tester 11, which is provided with a first current terminal I+, a second current terminal I-, a first voltage terminal U+ and a second voltage terminal U-. The test module 1 also includes a communication submodule 12, which can receive a communication signal sent by the control module 2, so that the DC resistance tester 11 performs a test according to the communication signal.

[0051] The control module 2 is specifically a PLC controller, which is provided with a first common terminal COM, a first control terminal X1, a second control terminal X2, a third control terminal X3, a fourth control terminal X4 and a fifth control terminal X5. The PLC can send a communication signal to the communication submodule 12 of the test module 1 to control the state of the DC resistance tester 11.

[0052] The execution module 3 is provided with a third current terminal B2, a fourth current terminal A1, a third voltage terminal B1 and a fourth voltage terminal A2. The third current terminal B2 is used to connect the first current terminal I+ of the test module 1, the fourth current terminal A1 is used to connect the second current terminal I- of the test module 1, the third voltage terminal B1 is used to connect the first voltage terminal U+ of the test module 1, and the fourth voltage terminal A2 is used to connect the second voltage terminal U- of the test module 1.

[0053] Reference Figure 3 , the execution module 3 includes a high-voltage relay 35. The high-voltage relay 35 is provided with terminals 510, 520, 530 and 540. Terminal 510 is connected to the third current terminal B2, terminal 520 is connected to the third voltage terminal B1, terminal 530 is connected to the fourth voltage terminal A2, and terminal 540 is connected to the fourth current terminal A1. Terminals 511, 521, 531 and 541 are also provided on the high-voltage relay 35. When the high-voltage relay 35 is energized, terminal 510 is connected to terminal 511, terminal 520 is connected to terminal 521, terminal 530 is connected to terminal 531, and terminal 540 is connected to terminal 541. When the high-voltage relay 35 is released, terminal 510 is disconnected from terminal 511, terminal 520 is disconnected from terminal 521, terminal 530 is disconnected from terminal 531, and terminal 540 is disconnected from terminal 541.

[0054] Reference Figure 2 The execution module 3 is provided with a first terminal U1 of the U-phase wire package, a second terminal U2 of the U-phase wire package, a first terminal V1 of the V-phase wire package, a second terminal V2 of the V-phase wire package, a first terminal W1 of the W-phase wire package, and a second terminal W2 of the W-phase wire package. The first terminal U1 of the U-phase wire package is used to connect the first end 101 of the U-phase wire package of the motor stator, the second terminal U2 of the U-phase wire package is used to connect the second end 201 of the U-phase wire package of the motor stator, the first terminal V1 of the V-phase wire package is used to connect the first end 102 of the V-phase wire package of the motor stator, the second terminal V2 of the V-phase wire package is used to connect the second end 202 of the V-phase wire package of the motor stator, the first terminal W1 of the W-phase wire package is used to connect the first end 103 of the W-phase wire package of the motor stator, and the second terminal W2 of the W-phase wire package is used to connect the second end 203 of the W-phase wire package of the motor stator.

[0055] Reference Figure 3The execution module 3 also includes a first contactor 31 , a second contactor 32 , a third contactor 33 and a fourth contactor 34 .

[0056] The first contactor 31 is provided with terminals 110, 111, 120 and 121. Terminal 110 is connected to terminal 511, terminal 111 is connected to the second terminal U2 of the U-phase wire package, terminal 120 is connected to terminal 521, and terminal 121 is connected to the first terminal U1 of the U-phase wire package. When the first contactor 31 is closed, terminal 110 is connected to terminal 111, and terminal 120 is connected to terminal 121. When the first contactor 31 is released, terminal 110 is disconnected from terminal 111, and terminal 120 is disconnected from terminal 121.

[0057] The second contactor 32 is provided with terminals 210, 211, 220 and 221. Terminal 210 is connected to terminal 511, terminal 211 is connected to the second terminal V2 of the V-phase wire package, terminal 220 is connected to terminal 521, and terminal 221 is connected to the first terminal V1 of the V-phase wire package. When the second contactor 32 is energized, terminal 210 is connected to terminal 211, and terminal 220 is connected to terminal 221. When the second contactor 32 is released, terminal 210 is disconnected from terminal 211, and terminal 220 is disconnected from terminal 221.

[0058] The third contactor 33 is provided with terminals 310, 311, 320 and 321. Terminal 310 is connected to terminal 531, terminal 311 is connected to the first terminal V1 of the V-phase wire package, terminal 320 is connected to terminal 541, and terminal 321 is connected to the second terminal V2 of the V-phase wire package. When the third contactor 33 is energized, terminal 310 is connected to terminal 311, and terminal 320 is connected to terminal 321. When the third contactor 33 is released, terminal 310 is disconnected from terminal 311, and terminal 320 is disconnected from terminal 321.

[0059] The fourth contactor 34 is provided with terminals 410, 411, 420 and 421. Terminal 410 is connected to terminal 531, terminal 411 is connected to the first terminal W1 of the W phase wire package, terminal 420 is connected to terminal 541, and terminal 421 is connected to the second terminal W2 of the W phase wire package. When the fourth contactor 34 is energized, terminal 410 is connected to terminal 411, and terminal 420 is connected to terminal 421. When the fourth contactor 34 is released, terminal 410 is disconnected from terminal 411, and terminal 420 is disconnected from terminal 421.

[0060] Reference Figure 2, the execution module 3 is also provided with a second common terminal COM, a sixth control terminal IN1, a seventh control terminal IN2, an eighth control terminal IN3, a ninth control terminal IN4 and a tenth control terminal IN5. The second common terminal COM is used to connect the first common terminal COM of the control module 2. The sixth control terminal IN1 is used to connect the first control terminal X1 of the control module 2, and the sixth control terminal IN1 is also connected to the first contactor 31, and the control module 2 can control the state of the first contactor 31. The seventh control terminal IN2 is used to connect the second control terminal X2 of the control module 2, and the seventh control terminal IN2 is also connected to the second contactor 32, and the control module 2 can control the state of the second contactor 32. The eighth control terminal IN3 is used to connect the third control terminal X3 of the control module 2, and the eighth control terminal IN3 is also connected to the third contactor 33, and the control module 2 can control the state of the third contactor 33. The ninth control terminal IN4 is used to connect the fourth control terminal X4 of the control module 2, and the ninth control terminal IN4 is also connected to the fourth contactor 34, and the control module 2 can control the state of the fourth contactor 34. The tenth control terminal IN5 is used to connect to the fifth control terminal X5 of the control module 2 . The tenth control terminal IN5 is also connected to the high-voltage relay 35 . The control module 2 can control the state of the high-voltage relay 35 .

[0061] The working principle of the test device is as follows: when the high-voltage relay 35 is energized, the test module 1 is connected to the execution module 3, and the test module 1 can perform detection. When an abnormality occurs in the circuit, the high-voltage relay 35 can be automatically released to disconnect the test module 1 from the execution module 3, so as to provide high-voltage protection for the test module 1. The control module 2 can control the energization / release state of the high-voltage relay 35 to control the connection or disconnection between the test module 1 and the execution module 3.

[0062] The control module 2 can also control the state of the first contactor 31 , the state of the second contactor 32 , the state of the third contactor 33 and the state of the fourth contactor 34 to control the execution module 3 to be in the first test state or the second test state.

[0063] The first test state is: when the first contactor 31 and the third contactor 33 are energized, and the second contactor 32 and the fourth contactor 34 are released, both ends of the U phase wire package and both ends of the V phase wire package are connected to the test module 1, and the test module 1 can detect the DC resistance between the U and V phases.

[0064] The second test state is: when the first contactor 31 and the third contactor 33 are released, and the second contactor 32 and the fourth contactor 34 are energized, the two ends of the V phase wire package and the two ends of the W phase wire package are connected to the test module 1, and the test module 1 can detect the DC resistance between the V and W phases.

[0065] This setup can prevent electromagnetic interference caused by the high voltage of the test circuit.

[0066] Furthermore, the contact surfaces of the contactor and the high-voltage relay are both provided with a protective layer, which is specifically a gold-plated layer. This arrangement makes the resistance value between the contacts stable and is minimally affected by the external environment.

[0067] The execution module 3 and the motor stator are spaced apart, and the distance of the spaced apart distance is the first safety distance. In the present embodiment, the first safety distance is not less than 6 mm. Grooves are provided between the wirings on the execution module 3, and grooves are also provided between the terminals on the execution module 3. The width of the grooves is the second safety distance. In the present embodiment, the second safety distance is 3 mm. The wiring line width on the execution module 3 is set to the safety line width. In the present embodiment, the safety line width is 3 mm. The above is only a preferred implementation of the present utility model. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be regarded as the protection scope of the present utility model.

Claims

1. A motor stator DC resistance test device, characterized in that: include: A test module, a control module and an execution module, wherein the test module and the control module are electrically connected to the execution module, and the execution module is also electrically connected to the U-phase wire package, the V-phase wire package and the W-phase wire package of the motor stator; The control module can control the execution module to switch to a first test state or a second test state. In the first test state, the test module can detect the DC resistance of the U-phase wire package and the V-phase wire package. In the second test state, the test module can detect the DC resistance of the V-phase wire package and the W-phase wire package.

2. A motor stator DC resistance test device according to claim 1, characterized in that: The execution module includes: A first contactor electrically connecting the U-phase line package and the test module; A second contactor electrically connecting the V-phase wire package and the test module; When the first contactor is closed and the second contactor is closed, the execution module switches to a first test state.

3. A motor stator DC resistance test device according to claim 2, characterized in that: The execution module also includes: A third contactor electrically connecting the V-phase wire package and the test module; a fourth contactor, electrically connecting the W-phase line package and the test module; When the third contactor is closed and the fourth contactor is closed, the execution module switches to the second test state.

4. A motor stator DC resistance test device according to claim 3, characterized in that: The execution module also includes a high-voltage relay, the test module is electrically connected to one end contact of the high-voltage relay, and the first contactor, the second contactor, the third contactor, and the fourth contactor are all connected to the other end contact of the high-voltage relay; When the high-voltage relay is closed, the test module can perform a DC resistance test on the motor stator.

5. A motor stator DC resistance test device according to claim 4, characterized in that: The execution module also includes a circuit board; The circuit of the first contactor is arranged on the circuit board; and / or The circuit of the second contactor is arranged on the circuit board; and / or The circuit of the third contactor is arranged on the circuit board; and / or The circuit of the fourth contactor is arranged on the circuit board; and / or The circuit of the high voltage relay is arranged on the circuit board.

6. A motor stator DC resistance test device according to claim 5, characterized in that: The circuit board and the motor stator are spaced apart, and the distance of the spaced apart is a first safety distance.

7. A motor stator DC resistance test device according to claim 5, characterized in that: Grooves are arranged between the wirings on the circuit board, and the grooves are also arranged between the terminals on the circuit board, and the width of the grooves is the second safety distance.

8. The motor stator DC resistance test device according to claim 5, characterized in that: The wiring line width on the circuit board is set to a safe line width.

9. The motor stator DC resistance test device according to claim 4, characterized in that: A protective layer is provided on the contact surface of the first contactor; and / or The contact surface of the second contactor is provided with a protective layer; and / or The contact surface of the third contactor is provided with a protective layer; and / or The contact surface of the fourth contactor is provided with a protective layer; and / or The contact surface of the high voltage relay is provided with a protective layer.

10. The motor stator DC resistance test device according to claim 4, characterized in that: The control module is electrically connected to the first contactor, and the control module can control the on / off state of the first contactor; and / or The control module is electrically connected to the second contactor, and the control module can control the on / off state of the second contactor; and / or The control module is electrically connected to the third contactor, and the control module can control the on / off state of the third contactor; and / or The control module is electrically connected to the fourth contactor, and the control module can control the opening and closing state of the fourth contactor; and / or The control module is electrically connected to the high voltage relay, and the control module can control the on / off state of the high voltage relay.

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