Power supply for motor test

Abstract

The utility model relates to a power supply used for motor test, comprising a frequency converter and a test motor, a sine wave loop and a PWM wave loop which are connected in parallel are arranged between the frequency converter and the test motor, a Q3 contactor is arranged on the PWM wave loop, and a Q2 contactor is arranged on the sine wave loop; according to the utility model, the sine wave loop and the PWM wave loop are arranged in parallel, can generate sine waves and PWM waves, can be respectively used for testing a three-phase asynchronous motor and a permanent magnet synchronous motor, and are matched with a contactor to realize the output of different power supplies through the switching of the loops, thereby realizing the two-in-one function of the power supply. The testing device can test a three-phase asynchronous motor and a permanent magnet synchronous motor, is convenient to use, and can reduce the cost.

Description

Technical Field

[0001] This utility model belongs to the field of motor testing, and specifically relates to a power supply for motor testing. Background Technology

[0002] In the field of motor testing, due to the different working principles of three-phase asynchronous motors and permanent magnet synchronous motors, different test power supplies are required during testing. Currently, the test power supplies in the testing field have relatively limited functions and cannot be universal. That is, they can only test three-phase asynchronous motors or only permanent magnet synchronous motors. The same power supply cannot be compatible with both types of motors. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a power supply for motor testing, which solves the compatibility problem of current test power supplies and realizes the testing functions of two types of motors on the same power supply.

[0004] The technical solution adopted in this utility model is:

[0005] A power supply for motor testing includes a frequency converter and a test motor. A sine wave circuit and a PWM wave circuit are connected in parallel between the frequency converter and the test motor. A contactor Q3 is provided on the PWM wave circuit, and a contactor Q2 is provided on the sine wave circuit.

[0006] Furthermore, the PWM wave circuit includes a wire directly connecting the frequency converter and the test motor, with the Q3 contactor mounted on the wire.

[0007] Furthermore, the sine wave circuit includes a sine wave converter and a transformer connected in series. The sine wave converter is connected to the frequency converter, the transformer is connected to the test motor, and the Q2 contactor is located between the sine wave converter and the frequency converter.

[0008] Furthermore, a Q4 contactor is installed between the transformer and the test motor.

[0009] Furthermore, the frequency converter is connected to the power supply line, and a Q1 contactor is provided between the frequency converter and the power supply line.

[0010] The positive effects of this utility model are:

[0011] This invention features a parallel sine wave circuit and a PWM wave circuit, which can generate sine waves and PWM waves, respectively, for testing three-phase asynchronous motors and permanent magnet synchronous motors. Simultaneously, in conjunction with a contactor, different power supplies can be output through circuit switching, achieving a dual power supply function. It can test both three-phase asynchronous motors and permanent magnet synchronous motors, making it convenient to use and reducing costs. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the principle of this utility model. Detailed Implementation

[0013] As attached Figure 1 As shown, this utility model discloses a power supply for motor testing, including a frequency converter connected to a 380V power supply line via a Q1 contactor and a test motor for testing. A sine wave circuit and a PWM wave circuit are provided in parallel between the frequency converter and the test motor.

[0014] The PWM circuit includes a wire connecting the inverter and the test motor, as well as a Q3 contactor mounted on the wire.

[0015] The sine wave circuit includes a sine wave converter and a transformer connected in series. The sine wave converter is connected to a frequency converter, the transformer is connected to a test motor, and a Q2 contactor is located between the sine wave converter and the frequency converter. A Q4 contactor is also located between the transformer and the test motor.

[0016] The test motor is a three-phase asynchronous motor or a permanent magnet synchronous motor.

[0017] Frequency converters are primarily used for outputting voltages of different frequencies to power subsequent circuits or directly drive permanent magnet synchronous motors. Adjusting the frequency converter's voltage allows for regulation of the sinusoidal power supply voltage, meeting the driving needs of motors with different voltage levels, and enabling program-based or remote control. Adjusting the frequency converter's frequency allows for regulation of the sinusoidal power supply frequency, meeting the driving needs of motors with different frequencies, and enabling program-based or remote control.

[0018] A sine wave converter is used to convert the PWM waveform power output from the frequency converter into a sine wave power supply. A transformer is used to perform secondary filtering and isolate the preceding and following loops, improving power quality.

[0019] The power supply of this invention can output two waveforms: a sine wave for testing three-phase asynchronous motors and a PWM wave for testing permanent magnet synchronous motors. Different power outputs can be achieved by switching the circuit.

[0020] When the power supply is operational, contactor Q1 is first closed to supply power to the frequency converter. When testing a three-phase asynchronous motor, contactors Q2 and Q4 are engaged, and contactor Q3 is disengaged. The frequency converter's output voltage and frequency are controlled via the panel to drive the three-phase asynchronous motor. When testing a permanent magnet synchronous motor, contactor Q3 is engaged, and contactors Q2 and Q4 are disengaged. The frequency converter's output voltage and frequency are controlled via the panel to drive the permanent magnet synchronous motor.

[0021] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A power supply for motor testing, characterized in that... It includes a frequency converter and a test motor. A sine wave circuit and a PWM wave circuit are connected in parallel between the frequency converter and the test motor. A Q3 contactor is provided on the PWM wave circuit and a Q2 contactor is provided on the sine wave circuit.

2. The power supply for motor testing according to claim 1, characterized in that... The PWM wave circuit includes a wire connecting the frequency converter and the test motor, and the Q3 contactor is installed on the wire.

3. The power supply for motor testing according to claim 1, characterized in that... The sine wave circuit includes a sine wave converter and a transformer connected in series. The sine wave converter is connected to the frequency converter, the transformer is connected to the test motor, and the Q2 contactor is located between the sine wave converter and the frequency converter.

4. A power supply for motor testing according to claim 3, characterized in that... A Q4 contactor is installed between the transformer and the test motor.

5. A power supply for motor testing according to claim 1, characterized in that... The frequency converter is connected to the power supply line, and a Q1 contactor is installed between the frequency converter and the power supply line.

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