An experimental device and experimental method for the thermal test of an elevator traction machine

Abstract

The present invention discloses a test device and a test method for the thermal test of an elevator traction machine. The device includes: an encoder, a traction main machine, a brake, a test platform, a frequency converter, a brake power supply, and a controller; the thermal test of the brake is carried out through the action test of the brake of the elevator traction machine to be tested, and the thermal test of the traction main machine to be tested is carried out by mechanically locking the brake of the elevator traction machine to be tested and controlling the torque of the drive frequency converter to load the elevator traction machine to be tested according to the equivalent current method; using this device does not require a large investment in equipment, and the test is simple, convenient and easy to implement.

Description

Technical Field

[0001] The present invention relates to the technical field of elevators, and particularly to a test device and a test method for the thermal test of an elevator traction machine. Background Art

[0002] The safe operation of an elevator depends on the reliable operation of the traction machine motor and the brake, and the temperature rise is one of its important technical indicators. During the thermal test, it is necessary to test the temperature rise of the traction machine motor coil and the brake coil to determine whether it meets the corresponding insulation material grade. Excessive temperature will have an adverse effect on the operation of the motor, directly affecting the normal operation of the elevator. After the brake works for a period of time, its action stroke will also change slightly. If the travel switch is not adjusted properly, the brake feedback detection function of the elevator will fail, easily causing elevator failures. Therefore, it is particularly important to conduct performance tests on the traction machine and the brake.

[0003] Currently, the commonly used methods for the thermal test and action test of elevator traction machines include the counter-rotating test method. This method usually uses a magnetic powder brake for loading during the test. The test bench structure consists of sensors, magnetic powder brakes, test platforms, etc. Using this test method, the thermal test of the test traction machine can be carried out, and the test results can very truthfully reflect the various performances of the test traction machine. However, it requires relatively high cost investment in sensors, magnetic powder brakes, etc., and has a large installation labor intensity and a cumbersome test process. The car method can also be used. This method can relatively truthfully reflect the state of the traction main machine under actual operating conditions. However, it also has the disadvantages of high investment cost and expensive test cost, which are beyond the affordability of ordinary traction machine manufacturers. At the same time, the actual thermal test and action test of the brake are actually tests on the components of the traction machine, ignoring the mutual influence between the traction machine motor and the brake, and the test results cannot reflect the operating state of the entire traction machine during operation. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the above background art, provide a test device and a test method for the thermal test of an elevator traction machine, and develop a corresponding test device based on this method. Practical applications have shown that the new test method is simple and easy to implement, and can meet the requirements of the research and development test of elevator traction machines.

[0005] The technical solution of the present invention is: a test device for the thermal test of an elevator traction machine, the device comprising: an encoder, a traction main machine, a brake, a test platform, a frequency converter, a brake power supply, and a controller; the encoder, the traction main machine, and the brake form a traction machine to be tested of an elevator, and the traction machine to be tested of the elevator is fixed on the test platform; the frequency converter is connected to the traction main machine of the traction machine to be tested of the elevator through a power cable and is used to drive the traction machine to be tested of the elevator to operate; the encoder is connected to the frequency converter through an encoder control cable and is used for vector control (torque control) of the traction main machine of the traction machine to be tested of the elevator; the brake power supply is connected to the brake through a control switch K1, and the brake circuit is controlled to be turned on or off by sending a Brake signal through the control switch K1, and is used for power supply to the brake of the traction machine to be tested of the elevator; the controller is respectively connected to the frequency converter through a control switch K2, and the start and stop of the frequency converter are controlled by sending an Enable signal through the control switch K2; the control switches K1 and K2 are controlled by the controller.

[0006] The controller for realizing the control timing sequence of the present device, controlling the start and stop of the frequency converter, and converting the signals for controlling the brake can be one of a PLC, a single-chip microcomputer, or an embedded controller.

[0007] A test method for the thermal test of an elevator traction machine, the specific operation steps of the method are as follows:

[0008] (1) First, fix the traction machine on the test platform, and conduct a continuous uninterrupted action test according to 100% rated voltage of the brake, operating duty system, load duration rate, and a cycle of 15 s; during the braking period of the brake, conduct a thermal test on the stator winding of the motor according to the equivalent current method.

[0009] (2) During the operation of the brake, the traction motor runs no-load, the controller disconnects the output of the Brake control signal of the brake, and at the same time turns on the Enable signal of the frequency converter. The frequency converter operates in the torque mode to apply torque to the traction machine (Mortor) to be tested of the elevator. Since the Brake signal of the brake is disconnected, the brake is engaged, and the traction machine to be tested of the elevator is in a locked state.

[0010] (3) The controller turns on the output of the Brake control signal of the brake, the brake engagement is released, the Enable signal of the frequency converter is turned on, and the frequency converter operates in the speed mode to drive the traction machine to be tested of the elevator to rotate. The traction machine to be tested of the elevator is in a no-load operation state.

[0011] (4) Sequentially and circularly perform operations (2) and (3) until the traction machine to be tested of the elevator and the brake reach a thermal stable state. When the whole traction machine reaches the thermal stable state, measure the temperature rise of the stator winding of the motor and the coil of the brake respectively according to the measurement method specified in 8.6.2 of GB755-2008.

[0012] The beneficial effects of the present invention are as follows: With this device, no large equipment investment is required. The test is simple and convenient to implement, and it can well simulate the working conditions of the traction motor and brake of the elevator, and can meet the test requirements of the traction machine heat test and the brake action test. The development and application of the equipment provide equipment support and technical guarantee for the development of the company's traction machine products, and effectively ensure the product compliance of the traction machines produced by the company. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic structural diagram of the present invention;

[0014] Figure 2 It is a timing diagram of the traction machine action of the present invention;

[0015] Figure 3 It is a circuit diagram of the traction machine performance test device of the present invention

[0016] Among them: 1. Encoder, 2. Traction main machine, 3. Brake, 4. Test platform, 5. Frequency converter, 6. Brake power supply, 7. Controller. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] This embodiment is a test device for the heat test of an elevator traction machine. The device includes: an encoder, a traction main machine, a brake, a test platform, a frequency converter, a brake power supply, and a controller; the encoder, the traction main machine, and the brake form the traction machine of the elevator to be tested, and the traction machine of the elevator to be tested is fixed on the test platform; the frequency converter is connected to the traction main machine of the traction machine of the elevator to be tested through a power cable for driving the traction machine of the elevator to be tested to operate; the encoder is connected to the frequency converter through an encoder control cable for vector control (torque control) of the traction main machine of the traction machine of the elevator to be tested; the brake power supply is connected to the brake after being connected through a control switch K1, and the brake circuit is controlled to be turned on or off by sending a Brake signal through the control switch K1 for power supply to the brake of the traction machine of the elevator to be tested; the controller is respectively connected to the frequency converter after passing through a control switch K2, and the start and stop of the frequency converter are controlled by sending an Enable signal through the control switch K2; the control switches K1 and K2 are controlled by the controller.

[0018] The controller for realizing the control timing sequence of this device, controlling the start and stop of the frequency converter, and controlling the signal conversion of the brake can be one of a PLC, a single-chip microcomputer, or an embedded controller.

[0019] A test method for the heat test of an elevator traction machine. The specific operation steps of this method are as follows:

[0020] (1) First, fix the traction machine on the test platform and conduct continuous uninterrupted action tests according to 100% rated voltage of the brake, operating duty system, load duration rate, and a cycle of 15 s; conduct a thermal test on the stator winding of the motor according to the equivalent current method during the braking period of the brake;

[0021] (2) During the operation of the brake, the traction motor runs no-load. The controller disconnects the output of the Brake control signal of the brake, and at the same time turns on the Enable signal of the frequency converter. The frequency converter operates in torque mode to apply torque to the traction machine (Mortor) of the elevator under test. Since the Brake signal is disconnected, the brake clamps, and the traction machine of the elevator under test is in a locked state;

[0022] (3) The controller turns on the output of the Brake control signal of the brake, the brake clamp opens, the Enable signal of the frequency converter is turned on, and the frequency converter operates in speed mode to drive the traction machine of the elevator under test to rotate. The traction machine of the elevator under test is in a no-load operation state;

[0023] (4) Sequentially cycle the operations in (2) and (3) until the traction machine and the brake of the elevator under test reach a thermal stable state. When the whole traction machine reaches the thermal stable state, measure the temperature rise of the stator winding of the motor and the brake coil respectively according to the measurement method specified in 8.6.2 of GB755-2008.

[0024] Using this test device and a new method, 100,000 action tests were carried out on a certain traction machine. The thermal test results of the traction motor and the brake are shown in Table 1.

[0025] Table 1 Thermal test results of the traction motor and the brake

[0026] Test item Temperature rise (K) Motor 76.1 Brake 55.2

[0027] A thermal test (mechanically unlocking the brake) was carried out on the traction motor of this elevator using the equivalent current method on the counter-traction test bench. The thermal test results of the traction motor are shown in Table 2.

[0028] Table 2 Thermal test results of the traction motor

[0029] Test item Temperature rise (K) Motor 72.5

[0030] 100,000 action tests were carried out on the brake of this elevator on the brake test bench. The thermal test results of the elevator brake are shown in Table 3.

[0031] Table 3 Thermal test results of the elevator brake

[0032] Test item Temperature rise (K) Brake 43.8

[0033] By comparing Tables 1 to 3, for the tests of the traction machine (motor, brake) components, the thermal test of the motor using the new method is slightly higher than the thermal test using the equivalent current method on the drag test bench, and the thermal test of the brake using the new method is significantly higher than the temperature rise test data of the brake test bench. In view of this, we conducted a complete machine thermal test on this traction machine according to the test method in the standard of "GB / T 24478-2009 Elevator Traction Machine", in accordance with the operating duty system, load duration rate and cyclic operation of the traction machine. The thermal test results of the traction machine motor and brake are shown in Table 4.

[0034] Table 4 Thermal test results of the traction machine motor and brake

[0035] Test item Temperature rise (K) Motor 74.2 Brake 53.5

[0036] Comparing Tables 1 and 4, it can be seen that the complete machine temperature rise test of the traction machine using the new method is basically consistent with the thermal test results of the motor and brake carried out according to the test method in the standard of "GB / T 24478-2009 Elevator Traction Machine", but slightly higher than the latter. This is because both test methods conduct the overall thermal test on the traction machine as a complete machine, rather than conducting tests on the motor and brake as independent components. However, due to reasons such as a higher number of motor starts and shorter acceleration and deceleration times during the test process, the thermal test result of the motor using the new method is slightly higher.

Claims

1. A test method for the thermal test of an elevator traction machine, which is implemented based on a test device for the thermal test of an elevator traction machine. The device includes an encoder, a traction main machine, a brake, a test platform, a frequency converter, a brake power supply, and a controller; the encoder, the traction main machine, and the brake form the elevator traction machine to be tested, and the elevator traction machine to be tested is fixed on the test platform; the frequency converter is connected to the traction main machine of the elevator traction machine to be tested through a power cable; the encoder is connected to the frequency converter through an encoder control cable; the brake power supply is connected to the brake through a control switch K1, and the brake circuit is controlled to be turned on or off by sending a Brake signal through the control switch K1; the controller is connected to the frequency converter respectively through a control switch K2, and the start and stop of the frequency converter are controlled by sending an Enable signal through the control switch K2; the control switches K1 and K2 are controlled by the controller; the controller for realizing the control timing sequence of this device, controlling the start and stop of the frequency converter, and converting the signals for controlling the brake adopts one of a PLC, a single-chip microcomputer, or an embedded controller; It is characterized in that The specific operation steps of this method are as follows: (1) First, fix the traction machine on the test platform, and conduct a continuous uninterrupted action test according to the 100% rated voltage of the brake, the operating duty system, the load duration rate, and a cycle of 15 s; during the braking period of the brake, conduct a thermal test on the stator winding of the motor according to the equivalent current method; (2) During the operation of the brake, the traction motor runs no-load. The controller disconnects the output of the Brake control signal of the brake, and at the same time turns on the Enable signal of the frequency converter. The frequency converter operates in the torque mode to apply torque to the elevator traction machine to be tested. Since the Brake signal of the brake is disconnected, the brake is engaged, and the elevator traction machine to be tested is in a locked state; (3) The controller turns on the output of the Brake control signal of the brake, the brake engagement is released, the Enable signal of the frequency converter is turned on, and the frequency converter operates in the speed mode to drive the elevator traction machine to be tested to rotate. The elevator traction machine to be tested is in a no-load operation state; (4) Sequentially and repeatedly perform steps (2) and (3) until the elevator traction machine to be tested and the brake reach a thermal stable state. When the whole traction machine reaches the thermal stable state, measure the temperature rise of the stator winding of the motor and the brake coil respectively according to the measurement method specified in 8.6.2 of GB755-2008.

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