A motor simulation device

Abstract

The present invention provides a motor simulation device, which includes a motor simulation part, and the motor simulation part includes a control board, a capacitor group, an isolated power supply and a second bridge arm. The overall structure of the motor simulation device of the present invention is simple, and as an integral module, it is small in size and low in weight; the motor simulation part with a unique structure can reproduce the volt-ampere characteristics of the motor; because the voltage between the motor simulation output positive pole and the motor simulation output negative pole in the motor simulation part is higher than the voltage between the power supply positive pole and the power supply negative pole, the motor simulation part has a stronger voltage regulation capability than the motor driver, so that the output voltage of the midpoint of the second bridge arm can be adjusted to achieve the purpose of adjusting the corresponding inductor current, thereby realizing the test of the motor driver, the operation is simple, and it is applicable to various motor drivers, and it is highly practical.

Description

Technical Field

[0001] The invention relates to the field of motor testing, and in particular to a motor simulation device. Background Art

[0002] With the development of electric vehicles, power tools, rail transit and other fields, various types of motor drivers are emerging. Motor drivers are key equipment to ensure the normal use of motors. During the development and production process, various indicators of motor drivers need to be tested. Motor drivers include DC motor drivers, AC motor drivers, brushless motor drivers, etc.

[0003] The traditional testing method uses the actual motor to build a test platform for testing, such as Figure 1 , the motor driver 1 to be tested needs to be connected to the motor 01 to be tested, the motor 01 to be tested needs to be mechanically connected to the accompanying motor 02 through the coupling 04, and the accompanying motor 02 needs to be driven by the accompanying driver 03. The entire system constitutes a traditional motor test platform, which can realize the test of the motor driver to be tested at a specified power. If the motor driver has a large power, the test system also needs to have a solid foundation platform to reduce vibration. Existing technologies require large investments in both funds and sites, and the requirements for users are very high.

[0004] Therefore, it is of great significance to develop a motor simulation device with a streamlined structure, which can simplify motor drive testing and effectively save costs. Summary of the invention

[0005] The present invention provides a motor simulation device with a simplified structure, which can simplify the motor driver test and effectively save costs. The specific technical solution is as follows:

[0006] A motor simulation device comprises a motor simulation part, wherein the motor simulation part comprises a control board, a capacitor bank, an isolated power supply and a second bridge arm;

[0007] The motor driver comprises at least two first bridge arms arranged between the positive pole of the power supply and the negative pole of the power supply and arranged in parallel;

[0008] The capacitor group includes a first capacitor C1 and a second capacitor C2 which are arranged in series between the positive electrode of the power supply and the negative electrode of the power supply, and the midpoint of the series connection of the first capacitor C1 and the second capacitor C2 is a reference point G;

[0009] The isolated power supply U1 includes an input end and an output end isolated from each other, the input end includes an input positive electrode in+ and an input negative electrode in-, the input positive electrode in+ is connected to the positive electrode of the power supply, and the input negative electrode in- is connected to the negative electrode of the power supply; the output end includes a first output end and a second output end isolated from each other, the first output end includes a first output positive electrode out1+ and a first output negative electrode out1-, the second output end includes a second output positive electrode out2+ and a second output negative electrode out2-, the first output positive electrode out1+ serves as a motor simulation output positive electrode DCM+, the first output negative electrode out1- is connected to the positive electrode of the power supply, the second output positive electrode out2+ is connected to the negative electrode of the power supply, and the second output negative electrode out2- serves as a motor simulation output negative electrode DCM-; the voltage VD2 between the motor simulation output positive electrode DCM+ and the motor simulation output negative electrode DCM- is 1.1-2 times the voltage VD1 between the positive electrode and the negative electrode of the power supply;

[0010] The second bridge arm is arranged between the motor analog output positive pole DCM+ and the motor analog output negative pole DCM-, and the second bridge arm is arranged one-to-one with the first bridge arm; an inductor and a current sensor are arranged between the midpoint of the first bridge arm and the midpoint of the second bridge arm corresponding to the first bridge arm, and the current sensor is used to detect the current of the inductor;

[0011] The voltage between the midpoint of all first bridge arms and the reference point and the current of the inductor are connected to the control board, and the control board controls the voltage between the midpoint of the second bridge arm and the reference point to control the current of the inductor.

[0012] Preferably in the above technical solution, the first bridge arm and the second bridge arm are both composed of power switch tubes.

[0013] Preferably in the above technical solution, the power switch tube is an IGBT power switch, a MOSFET power switch or a SiC power switch.

[0014] Preferably in the above technical solution, the first bridge arm includes a first switch tube and a second switch tube, the first pole of the first switch tube is connected to the positive pole of the power supply, the second pole of the first switch tube is connected to the first pole of the second switch tube, and the second pole of the second switch tube is connected to the negative pole of the power supply; the connection point between the first switch tube and the second switch tube is the midpoint of the first bridge arm.

[0015] Preferably in the above technical solution, the second bridge arm includes a third switch tube and a fourth switch tube, the first pole of the third switch tube is connected to the motor analog output positive pole DCM+, the second pole of the third switch tube is connected to the first pole of the fourth switch tube, and the second pole of the fourth switch tube is connected to the motor analog output negative pole DCM-; the connection point between the third switch tube and the fourth switch tube is the midpoint of the second bridge arm.

[0016] Preferably in the above technical solution, the inductor is located between a midpoint of the first bridge arm and a midpoint of a second bridge arm corresponding to the first bridge arm, and the current sensor is located on the inductor to detect the inductor current.

[0017] Preferably in the above technical solution, the motor driver is a two-phase motor driver, which includes two first bridge arms, and the motor simulation part includes two second bridge arms corresponding to the first bridge arms one by one.

[0018] Preferably in the above technical solution, the motor driver is a three-phase motor driver, which includes three first bridge arms, and the motor simulation part includes three second bridge arms corresponding to the first bridge arms one by one.

[0019] The motor simulation device of the present invention comprises a motor simulation part, wherein the motor simulation part comprises a control board, a capacitor group, an isolated power supply and a second bridge arm, and the overall structure is streamlined, and as an integral module, the volume is small and the weight is low; the basic function of the entire motor simulation part is to reproduce the volt-ampere characteristic of the motor, that is, according to the motor driver relative to the reference point under the specific output voltage condition, according to the simulated motor characteristic output corresponding current. Since the voltage between the motor simulation output positive pole and the motor simulation output negative pole in the motor simulation part is higher than the voltage between the power supply positive pole and the power supply negative pole (i.e., the DC bus voltage of the motor driver) (preferably 1.1-2 times), therefore, the motor simulation part has a stronger voltage regulation capability than the motor driver, so that the purpose of regulating the corresponding inductor current can be achieved by adjusting the output voltage of the midpoint of the second bridge arm, thereby realizing the test of the motor driver, simple operation, and applicable to various motor drivers, and strong practicality.

[0020] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0022] Figure 1 This is the schematic diagram of the traditional motor test platform;

[0023] Figure 2 It is a structural diagram of the motor simulation device of the preferred embodiment 1 of the present invention for testing the motor driver;

[0024] Figure 3 yes Figure 2 Schematic diagram;

[0025] Figure 4It is a schematic diagram of a preferred embodiment 2 of the present invention;

[0026] Among them, 1. Motor driver, 2. Motor simulation part, 2.1. Control board;

[0027] 01. Test motor, 02. Test motor, 03. Test driver, 04. Coupling. DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered by the claims.

[0029] Embodiment 1:

[0030] A motor simulator for testing two-phase motor drives, see Figure 2 and Figure 3 , specifically including the motor simulation part 2, the motor simulation part 2 includes a control board 2.1, a capacitor group, an isolated power supply and a second bridge arm, the details are as follows:

[0031] The motor driver 1 includes a first bridge arm A and a first bridge arm B which are arranged between the positive electrode DC+ and the negative electrode DC- of the power supply and are arranged in parallel. The first bridge arm A includes a first switch tube VT1 and a second switch tube VT2. The first electrode of the first switch tube VT1 is connected to the positive electrode of the power supply, the second electrode of the first switch tube VT1 is connected to the first electrode of the second switch tube VT2, and the second electrode of the second switch tube VT2 is connected to the negative electrode of the power supply. The connection point between the first switch tube VT1 and the second switch tube VT2 is the midpoint U of the first bridge arm A. The first bridge arm B includes a first switch tube VT3 and a second switch tube VT4. The first electrode of the first switch tube VT3 is connected to the positive electrode of the power supply, the second electrode of the first switch tube VT3 is connected to the first electrode of the second switch tube VT4, and the second electrode of the second switch tube VT4 is connected to the negative electrode of the power supply. The connection point between the first switch tube VT3 and the second switch tube VT4 is the midpoint V of the first bridge arm B. The voltage between the positive electrode DC+ and the negative electrode DC- of the power supply is VD1.

[0032] The capacitor group includes a first capacitor C1 and a second capacitor C2 connected in series between a positive power supply electrode DC+ and a negative power supply electrode DC-, and a midpoint of the series connection of the first capacitor C1 and the second capacitor C2 is a reference point G.

[0033] The isolated power supply U1 is a two-way output DCDC conversion power supply, which includes an input end and an output end isolated from each other, the input end includes an input positive electrode in+ and an input negative electrode in-, the input positive electrode in+ is connected to the positive electrode DC+ of the power supply, and the input negative electrode in- is connected to the negative electrode DC- of the power supply; the output end includes a first output end and a second output end isolated from each other, the first output end includes a first output positive electrode out1+ and a first output negative electrode out1-, the second output end includes a second output positive electrode out2+ and a second output negative electrode out2-, the first output positive electrode out1+ serves as a motor simulation output positive electrode DCM+, the first output negative electrode out1- is connected to the positive electrode of the power supply, the second output positive electrode out2+ is connected to the negative electrode of the power supply, and the second output negative electrode out2- serves as a motor simulation output negative electrode DCM-; the voltage between the motor simulation output positive electrode DCM+ and the motor simulation output negative electrode DCM- is VD2, and VD2 is 1.1-2 times of VD1, that is, VD2 is 10%-100% higher than VD1.

[0034] The motor simulation part 2 includes a second bridge arm A and a second bridge arm B, and the second bridge arm A and the second bridge arm B are both arranged between the motor simulation output positive pole DCM+ and the motor simulation output negative pole DCM-. The second bridge arm A is arranged corresponding to the first bridge arm A, and the second bridge arm B is arranged corresponding to the first bridge arm B. Specifically, the second bridge arm A includes a third switch tube VT7 and a fourth switch tube VT8, wherein the first pole of the third switch tube VT7 is connected to the positive pole DCM+ of the motor simulation output, the second pole of the third switch tube VT7 is connected to the first pole of the fourth switch tube VT8, and the second pole of the fourth switch tube VT8 is connected to the negative pole DCM- of the motor simulation output; the connection point between the third switch tube VT7 and the fourth switch tube VT8 is the midpoint D of the second bridge arm; the second bridge arm B includes a third switch tube VT9 and a fourth switch tube VT10, wherein the first pole of the third switch tube VT9 is connected to the positive pole DCM+ of the motor simulation output, the second pole of the third switch tube VT9 is connected to the first pole of the fourth switch tube VT10, and the second pole of the fourth switch tube VT10 is connected to the negative pole DCM- of the motor simulation output; the connection point between the third switch tube VT9 and the fourth switch tube VT10 is the midpoint E of the second bridge arm.

[0035] The inductor L1 is located between a midpoint U of the first bridge arm A and a midpoint D of the second bridge arm A. The current sensor I1 is located on the inductor L1 to detect the current of the inductor L1.

[0036] The inductor L2 is located between a midpoint V of the first bridge arm B and a midpoint E of the second bridge arm B. The current sensor I2 is located on the inductor L2 to detect the current of the inductor L2.

[0037] The first switch tube VT1, the second switch tube VT2, the first switch tube VT3, the second switch tube VT4, the third switch tube VT7, the fourth switch tube VT8, the third switch tube VT9 and the fourth switch tube VT10 are all power switch tubes, preferably IGBT power switches, MOSFET power switches or SiC power switches.

[0038] The midpoint U of the first bridge arm A, the midpoint V of the first bridge arm B, the reference point G, the current sensor I1 and the current sensor I2 are all connected to the control board 2.1. The control board here is the existing technology, which can be selected according to actual needs and can achieve the following functions: the control board detects the voltage between the midpoint U of the first bridge arm A and the reference point G, and adjusts the voltage between the midpoint D of the second bridge arm A of the motor simulation part 2 (i.e., the motor simulator) and the reference point G according to the motor characteristics to control the current of the inductor L1; the control board detects the voltage between the midpoint V of the first bridge arm B and the reference point G, and adjusts the voltage between the midpoint E of the second bridge arm B and the reference point G according to the motor characteristics to control the current of the inductor L2. Thus, the motor driver 1 can be tested.

[0039] Embodiment 2:

[0040] A motor simulator for testing three-phase motor drivers, see Figure 4 , which is different from Example 1 in that:

[0041] The motor driver 1 also includes a first bridge arm C arranged between the positive pole DC+ of the power supply and the negative pole DC- of the power supply. The first bridge arm C includes a first switch tube VT5 and a second switch tube VT6. The first pole of the first switch tube VT5 is connected to the positive pole of the power supply, the second pole of the first switch tube VT5 is connected to the first pole of the second switch tube VT6, and the second pole of the second switch tube VT6 is connected to the negative pole of the power supply. The connection point between the first switch tube VT5 and the second switch tube VT6 is the midpoint W of the first bridge arm C.

[0042] The motor simulation part 2 also includes a second bridge arm C corresponding to the first bridge arm C, and the second bridge arm C includes a third switch tube VT11 and a fourth switch tube VT12. The first pole of the third switch tube VT11 is connected to the motor simulation output positive pole DCM+, the second pole of the third switch tube VT11 is connected to the first pole of the fourth switch tube VT12, and the second pole of the fourth switch tube VT12 is connected to the motor simulation output negative pole DCM-; the connection point between the third switch tube VT11 and the fourth switch tube VT12 is the midpoint F of the second bridge arm.

[0043] The inductor L3 is located between a midpoint W of the first bridge arm C and a midpoint F of the second bridge arm C. The current sensor I3 is located on the inductor L3 to detect the current of the inductor L3.

[0044] The first switch tube VT5, the second switch tube VT6, the third switch tube VT11 and the fourth switch tube VT12 are all power switch tubes, preferably IGBT power switches, MOSFET power switches or SiC power switches.

[0045] The midpoint U of the first bridge arm A, the midpoint V of the first bridge arm B, the midpoint W of the first bridge arm C, the reference point G, the current sensor I1, the current sensor I2 and the current sensor I3 are all connected to the control board 2.1. The voltage between the midpoint U of the first bridge arm A and the reference point G is detected by the control board, and the voltage between the midpoint D of the second bridge arm A and the reference point G is adjusted according to the motor characteristics to control the current of the inductor L1; the voltage between the midpoint V of the first bridge arm B and the reference point G is detected by the control board, and the voltage between the midpoint E of the second bridge arm B and the reference point G is adjusted according to the motor characteristics to control the current of the inductor L2; the voltage between the midpoint W of the first bridge arm C and the reference point G is detected by the control board, and the voltage between the midpoint F of the second bridge arm C and the reference point G is adjusted according to the motor characteristics to control the current of the inductor L3; thereby testing the motor driver 1.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. 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 motor simulation device, characterized in that: It comprises a motor simulation part (2), wherein the motor simulation part (2) comprises a control board (2.1), a capacitor group, an isolated power supply and a second bridge arm; The motor driver comprises at least two first bridge arms arranged between the positive pole of the power supply and the negative pole of the power supply and arranged in parallel; The capacitor group comprises a first capacitor (C1) and a second capacitor (C2) which are arranged in series between the positive electrode of the power supply and the negative electrode of the power supply, and the midpoint of the series connection of the first capacitor (C1) and the second capacitor (C2) is a reference point (G); The isolated power supply (U1) comprises an input end and an output end isolated from each other, wherein the input end comprises an input positive pole (in+) and an input negative pole (in-), the input positive pole (in+) is connected to the positive pole of the power supply, and the input negative pole (in-) is connected to the negative pole of the power supply; the output end comprises a first output end and a second output end isolated from each other, the first output end comprises a first output positive pole (out1+) and a first output negative pole (out1-), the second output end comprises a second output positive pole (out2+) and a second output negative pole (out2-), the first output positive pole (out1+) serves as a motor simulation output positive pole (DCM+), the first output negative pole (out1-) is connected to the positive pole of the power supply, the second output positive pole (out2+) is connected to the negative pole of the power supply, and the second output negative pole (out2-) serves as a motor simulation output negative pole (DCM-); the voltage (VD2) between the motor simulation output positive pole (DCM+) and the motor simulation output negative pole (DCM-) is 1.1-2 times the voltage (VD1) between the positive pole of the power supply and the negative pole of the power supply; The second bridge arm is arranged between the motor analog output positive pole (DCM+) and the motor analog output negative pole (DCM-), and the second bridge arm is arranged in one-to-one correspondence with the first bridge arm; an inductor and a current sensor are arranged between the midpoint of the first bridge arm and the midpoint of the second bridge arm corresponding to the first bridge arm, and the current sensor is used to detect the current of the inductor; The voltage between the midpoint of all first bridge arms and the reference point and the current of the inductor are connected to the control board, and the control board controls the voltage between the midpoint of the second bridge arm and the reference point to control the current of the inductor.

2. The motor simulation device according to claim 1, characterized in that: The first bridge arm and the second bridge arm are both composed of power switch tubes.

3. The motor simulation device according to claim 2, characterized in that: The power switch tube is an IGBT power switch, a MOSFET power switch or a SiC power switch.

4. The motor simulation device according to claim 2, characterized in that: The first bridge arm includes a first switch tube and a second switch tube, the first pole of the first switch tube is connected to the positive pole of the power supply, the second pole of the first switch tube is connected to the first pole of the second switch tube, and the second pole of the second switch tube is connected to the negative pole of the power supply; the connection point between the first switch tube and the second switch tube is the midpoint of the first bridge arm.

5. The motor simulation device according to claim 2, characterized in that: The second bridge arm includes a third switch tube and a fourth switch tube, the first pole of the third switch tube is connected to the positive pole of the motor simulation output (DCM+), the second pole of the third switch tube is connected to the first pole of the fourth switch tube, and the second pole of the fourth switch tube is connected to the negative pole of the motor simulation output (DCM-); the connection point between the third switch tube and the fourth switch tube is the midpoint of the second bridge arm.

6. The motor simulation device according to claim 5, characterized in that: The inductor is located between a midpoint of a first bridge arm and a midpoint of a second bridge arm corresponding to the first bridge arm, and the current sensor is located on the inductor to detect the inductor current.

7. The motor simulation device according to any one of claims 1 to 6, characterized in that: The motor driver is a two-phase motor driver, which includes two first bridge arms, and the motor simulation part (2) includes two second bridge arms corresponding to the first bridge arms one by one.

8. The motor simulation device according to any one of claims 1 to 6, characterized in that: The motor driver is a three-phase motor driver, which includes three first bridge arms, and the motor simulation part (2) includes three second bridge arms corresponding to the first bridge arms one by one.

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