Device for testing performance of permanent magnet synchronous motor and controller thereof

Abstract

The invention discloses a device for testing performance of a permanent magnet synchronous motor and a controller thereof, which belongs to the technical field of motor testing equipment and comprises an equipment frame, an industrial personal computer is arranged on the upper portion of the equipment frame, a communication interface is arranged on the industrial personal computer, and a programmable power supply is arranged on the lower portion of the equipment frame located on the lower portion of an engineering machine. The programmable power supply is communicated with the industrial personal computer through a serial port, a display screen is arranged on the programmable power supply, information can be transmitted to the industrial personal computer, the industrial personal computer can set the output voltage and the maximum current of the programmable power supply through the serial port, and an iron bottom plate is arranged on the equipment frame. The iron bottom plate is provided with a driving motor, a gear box, a servo motor and a motor phase voltage and current testing plate, and through an integrated testing environment, the device is few, the operation process is simple, the cost is low, and motor performance testing can be conveniently carried out.

Description

Technical Field

[0001] The invention relates to the field of motor testing equipment, and in particular to a device for testing the performance of a permanent magnet synchronous motor and a controller thereof. Background Art

[0002] A motor is a device that converts electrical energy into mechanical energy. In modern industry, motors have been widely used in various fields and are known as the heart of modern industry. There are many types of motors, among which permanent magnet synchronous motors have the advantages of simple structure, small size, high efficiency, and high power factor. In the automotive industry, they are widely used in EPS, water pumps, oil pumps, and drive motors. Therefore, it is particularly important to test the performance of motors and their controllers.

[0003] However, traditional equipment has the problem of complex process and multiple equipments in testing various performances of motors during use. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a device for testing the performance of a permanent magnet synchronous motor and its controller, which overcomes the deficiencies in the prior art and solves the problem that the traditional equipment has a complex process for testing various performances of the motor and requires a large number of devices during use.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a device for testing the performance of a permanent magnet synchronous motor and its controller, comprising an equipment frame, an industrial computer is provided on the upper part of the equipment frame, a communication interface is provided on the industrial computer, and a programmable power supply is provided on the lower part of the equipment frame located at the lower part of the engineering machine, and the programmable power supply and the industrial computer communicate through a serial port. A display screen is provided on the programmable power supply, and the information will be transmitted to the industrial computer. The industrial computer can set the output voltage and maximum current of the programmable power supply through the serial port, and an iron bottom plate is provided on the equipment frame, and a drive motor, a gear box, a servo motor and a motor phase voltage and current test board are provided on the iron bottom plate.

[0006] By adopting the above technical solution, when in use, multiple devices can be positioned and fixed through the equipment rack. The programmable power supply and the industrial computer communicate through the serial port. The voltage and current information can be displayed on the display screen of the programmable power supply. The information will be transmitted to the industrial computer. The industrial computer can set the output voltage and maximum current of the programmable power supply through the serial port.

[0007] As a preferred technical solution of the present invention, a motor control board, a coupling, a transmission shaft, a torque sensor and a position sensor are arranged on the iron bottom plate.

[0008] By adopting the above technical solution, the motor control board, the coupling, the transmission shaft, the torque sensor and the position sensor can be fixed through the iron bottom plate.

[0009] As a preferred technical solution of the present invention, the motor control board is powered by a programmable power supply, the phase line of the motor control board is connected to the first terminal of the motor phase voltage and current test board, and the motor control board communicates with the industrial computer through the CAN bus.

[0010] By adopting the above technical solution, the motor control board can be powered by the programmable power supply.

[0011] As a preferred technical solution of the present invention, the motor phase voltage and current test board is powered by a programmable power supply, its driving motor is connected to the second terminal, and the motor phase voltage and current test board is connected to the industrial computer via a CAN line.

[0012] By adopting the above technical solution, the motor phase voltage and current test board can be powered by the programmable power supply.

[0013] As a preferred technical solution of the present invention, the shaft of the driving motor is connected to the left half of the coupling, the coupling is divided into left and right parts, the two parts are fastened by bolts, and the right half of the coupling is connected to the transmission shaft by a key.

[0014] By adopting the above technical solution, the coupling can be fixed by driving the motor. Different motors have different shaft diameters, so the left half of the coupling needs to be replaced to match them. Therefore, this specially designed coupling can be easily replaced.

[0015] As a preferred technical solution of the present invention, the transmission shaft is equipped with a torque sensor and a position sensor.

[0016] By adopting the above technical solution, the transmission shaft can be detected by the torque sensor and the position sensor.

[0017] As a preferred technical solution of the present invention, the end of the transmission shaft is connected to a gear box.

[0018] By adopting the above technical solution, the gears inside the gear box can be driven by the transmission shaft.

[0019] As a preferred technical solution of the present invention, the gear box is connected to the servo motor.

[0020] By adopting the above technical solution, the gears inside the gear box can be connected to the shaft of the servo motor.

[0021] As a preferred technical solution of the present invention, the servo motor is connected to the industrial computer via a data line.

[0022] By adopting the above technical solution, the servo motor and the industrial computer can be connected through the data line, so the speed data can be transmitted to the industrial computer, and the commands transmitted by the industrial computer can also be received.

[0023] As a preferred technical solution of the present invention, the motor phase voltage and current test board is internally composed of 3 resistors, 3 current sensors, a single-chip microcomputer, an SBC, a first terminal and a second terminal. One side of the 3 resistors is connected to the negative electrode, and the other side is respectively connected to the first terminal, and is also respectively connected to the AD port of the single-chip microcomputer. The first terminal is connected to the second terminal on the other side through the current sensor, and the output end of the current sensor is respectively connected to the AD port of the single-chip microcomputer. The single-chip microcomputer is powered by the SBC, and the single-chip microcomputer collects and processes the signal through the AD port and communicates with the industrial computer through the CAN bus.

[0024] By adopting the above technical solution, the device is composed of a first terminal, a second terminal, a resistor, a current sensor, a single chip microcomputer (MCU) and an SBC.

[0025] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides an integrated testing environment, requires less equipment, has a simple operation process, and has a low cost, so that motor performance testing is convenient.

[0026] The present invention can increase the speed range generated by the servo motor through different speed ratios of the gear pairs of the gear box, so only one high-torque servo motor is needed to test more motors to be tested.

[0027] The present invention can conveniently test the phase voltage and phase current of the motor by using the motor phase voltage and current test board, and transmit these data to the industrial computer through the CAN bus without using an oscilloscope for testing. As we all know, the oscilloscope is an expensive device, especially a 6-channel oscilloscope (6 channels are required to measure 3-phase voltage and current at the same time). Therefore, this solution is a more cost-effective solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is an overview diagram of the present invention; Figure 2 This is a schematic circuit diagram of the motor phase voltage and current test board in the present invention.

[0029] Description of reference numerals: 1. Equipment rack; 2. Industrial computer; 3. Programmable power supply; 4. Motor control board; 5. Iron base plate; 6. Motor phase voltage and current test board; 7. Drive motor; 8. Coupling; 9. Transmission shaft; 10. Torque sensor; 11. Position sensor; 12. Gearbox; 13. Servo motor; 14. Communication interface; 15. Resistor; 16. Second terminal; 17. Current sensor; 18. First terminal; 19. Single chip microcomputer; 20. SBC. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] See also Figure 1-2 , a device for testing the performance of a permanent magnet synchronous motor and its controller, implementation scheme: The industrial computer 2 sends a fixed speed to the servo motor 13 through the serial port. The servo motor 13 drives the transmission shaft 9 to rotate after the speed is changed by the gear box 12. The industrial computer 2 sends a torque command to the motor control board 4 through the CAN bus. The motor control board 4 controls the motor rotation. The torque sensor 10 and the position sensor 11 send information to the industrial computer 2. Therefore, you only need to write a specific program on the industrial computer 2 to test the external characteristic curve of the motor with one click. The industrial computer 2 can also calculate the efficiency information of the electronic control through the voltage and current information output by the programmable power supply 3 and the information of the torque sensor 10 and the position sensor 11.

[0032] Generally, for cost considerations, the current acquisition solution adopted by the motor control board 4 is basically implemented through three low-side resistors 15, and some even only use one. Therefore, by comparing the phase current information output by the motor control board 4 and the phase current information fed back by the motor phase voltage and current test board 6, it can be intuitively displayed on the industrial computer 2 whether the current information calculated by the motor control board 4 is accurate and whether the waveform is a standard sine wave, providing information for program optimization of the motor control board 4.

[0033] The motor control board 4 is disconnected from the motor phase voltage and current test board 6, and the drive motor 7 is driven to rotate by the servo motor 13. The motor control board 4 outputs the tested drive motor 7 position signal through the CAN bus, and compares it with the zero crossing of the reverse electromotive force output by the motor phase voltage and current test board 6 to correct the calculation of the drive motor 7 position signal by the motor control board 4, thereby improving the control effect.

[0034] The selected servo motor 13 is a high-torque motor, which can be accelerated by a gearbox 12 . The gearbox 12 can at least provide transmission ratios of 1:1, 1:1.5 and 1:2. After acceleration, the output torque of the servo motor 13 on the shaft still needs to be greater than the maximum torque of the drive motor 7 .

[0035] In addition, when the motor control board 4 is not connected, the industrial computer 2 sends a command to rotate the servo motor 13, thereby driving the drive motor 7 to rotate. At this time, the reverse electromotive force of the drive motor 7 can be measured through the motor phase voltage and current control board, thereby calculating ke. The number of pole pairs of the drive motor 7 can be calculated based on the position sensor 11 and the frequency of the reverse electromotive force.

[0036] Finally, it should be noted that in the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0037] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A device for testing the performance of a permanent magnet synchronous motor and its controller, comprising a device frame (1), characterized in that: An industrial computer (2) is provided on the upper part of the equipment rack (1), and a communication interface (14) is provided on the industrial computer (2). A program-controlled power supply (3) is provided on the lower part of the equipment rack (1) located below the industrial computer (2). The program-controlled power supply (3) and the industrial computer (2) communicate via a serial port. A display screen is provided on the program-controlled power supply (3), and the information is transmitted to the industrial computer (2). The industrial computer (2) can set the output voltage and maximum current of the program-controlled power supply (3) via the serial port. An iron bottom plate (5) is provided on the equipment rack (1), and a drive motor (7), a gear box (12), a servo motor (13), and a motor phase voltage and current test board (6) are provided on the iron bottom plate (5).

2. The device for testing the performance of a permanent magnet synchronous motor and its controller according to claim 1, characterized in that: The iron bottom plate (5) is provided with a motor control board (4), a coupling (8), a transmission shaft (9), a torque sensor (10) and a position sensor (11).

3. The device for testing the performance of a permanent magnet synchronous motor and its controller according to claim 2, characterized in that: The motor control board (4) is powered by a programmable power supply (3), a phase line of the motor control board (4) is connected to a first terminal (18) of a motor phase voltage and current test board (6), and the motor control board (4) communicates with an industrial computer (2) via a CAN bus.

4. The device for testing the performance of a permanent magnet synchronous motor and its controller according to claim 1, characterized in that: The motor phase voltage and current test board (6) is powered by a programmable power supply (3), and its drive motor (7) is connected to the second terminal (16). The motor phase voltage and current test board (6) is connected to the industrial computer (2) via a CAN line.

5. The device for testing the performance of a permanent magnet synchronous motor and its controller according to claim 1, characterized in that: The shaft of the drive motor (7) is connected to the left half of the coupling (8), the coupling (8) is divided into left and right parts, the two parts are fastened by bolts, and the right half of the coupling (8) is connected to the transmission shaft (9) by a key.

6. The device for testing the performance of a permanent magnet synchronous motor and its controller according to claim 5, characterized in that: The transmission shaft (9) is equipped with a torque sensor (10) and a position sensor (11).

7. The device for testing the performance of a permanent magnet synchronous motor and its controller according to claim 6, characterized in that: The end of the transmission shaft (9) is connected to a gear box (12).

8. The device for testing the performance of a permanent magnet synchronous motor and its controller according to claim 1, characterized in that: The gear box (12) is connected to the servo motor (13).

9. The device for testing the performance of a permanent magnet synchronous motor and its controller according to claim 1, characterized in that: The servo motor (13) is connected to the industrial computer (2) via a data line.

10. The device for testing the performance of a permanent magnet synchronous motor and its controller according to claim 1, characterized in that: The motor phase voltage and current test board (6) is internally composed of three resistors (15), three current sensors (17), a single chip microcomputer (19), an SBC (20), a first terminal (18) and a second terminal (16); one side of the three resistors (15) is connected to the negative electrode, and the other side is respectively connected to the first terminal (18), and is also respectively connected to the AD port of the single chip microcomputer (19); the first terminal (18) is respectively connected to the second terminal (16) on the other side through the current sensor (17); the output end of the current sensor (17) is respectively connected to the AD port of the single chip microcomputer (19); the single chip microcomputer (19) is powered by the SBC (20); the single chip microcomputer (19) collects and processes signals through the AD port and then communicates with the industrial control computer (2) through the CAN bus.

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