Common-bus multi-three-phase permanent magnet motor performance testing device

Abstract

The utility model relates to the technical field of special motor equipment, in particular to a common-bus multi-three-phase permanent magnet motor performance testing device, which comprises an uncontrollable rectifier, n inverters, an inverter group matched with the n inverters, n rectifiers, a rectifier group matched with the n rectifiers, a multi-three-phase permanent magnet motor, a data acquisition module and an upper computer, one end of the uncontrollable rectifier is connected with the alternating-current power grid; the direct current ends of the inverter group and the rectifier group are connected to the positive and negative electrodes of the direct current bus to form a common bus structure; the multi-three-phase permanent magnet motor is provided with 2n sets of three-phase winding units, n sets of three-phase windings are respectively connected with a rectifier group and an inverter group, and each set of three-phase winding is connected by adopting an independent neutral point; according to the utility model, all the inverters are connected in parallel on the same direct current bus power supply, one half winding is in a power generation state, and the other half winding is in an electric state, so that energy feedback of rectification and inversion is realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of multi-three-phase permanent magnet motor performance test devices, and specifically relates to a low-cost, energy-saving common-bus multi-three-phase permanent magnet motor performance test device. Background Art

[0002] Multi-three-phase permanent magnet motors are widely used in high-power drive applications such as wind power generation, special vehicles, and ship propulsion due to their advantages such as high torque density, small torque pulsation, and strong fault tolerance. However, when multi-three-phase permanent magnet motors are subjected to performance tests such as rated operating conditions, temperature rise tests, and parameter measurements, they are usually required to be equipped with accompanying test motors and converter equipment of the same power and speed, and run for several hours under rated operating conditions. The required test equipment is costly, the installation and debugging process is complicated, and the two motors consume a lot of electricity during the test. Therefore, the cost required for the existing multi-three-phase permanent magnet motor performance test is extremely high. Therefore, a common bus multi-three-phase permanent magnet motor performance test device is provided, in which the windings work in rectification and inverter working modes respectively. The multi-three-phase permanent magnet motor on the test platform does not require a mechanical load, is easy to install, and has an energy feedback function. The overall test plan and equipment cost advantages are obvious. Utility Model Content

[0003] The purpose of the utility model is to provide a multi-three-phase permanent magnet motor performance testing device to solve the problem that the multi-three-phase permanent magnet motor test proposed in the above background technology requires the test motors with the same power and speed, and more equipment, space, power supply, etc. need to be prepared in advance, which increases the equipment, installation and testing costs exponentially, and does not meet the requirements of energy-saving equipment and low testing costs.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a common bus multi-three-phase permanent magnet motor performance test device, comprising an uncontrolled rectifier, an inverter group consisting of n inverters and matching inverter controllers, a rectifier group consisting of n rectifiers and matching rectifier controllers, a multi-three-phase permanent magnet motor, a data acquisition module and a host computer, n≥2;

[0005] One end of the uncontrolled rectifier is connected to the AC grid, and the other end is connected to the positive and negative poles of the DC bus; the DC ends of the inverter group and the rectifier group are connected to the positive and negative poles of the DC bus to form a common bus structure; the multi-three-phase permanent magnet motor is used as the tested motor, and has 2n sets of three-phase winding units, wherein n sets of three-phase windings are respectively connected to the rectifier group, and n sets of three-phase windings are respectively connected to the inverter group, and each set of three-phase windings is connected with an independent neutral point, and its mechanical shaft output is in a no-load state; the uncontrolled rectifier is used to realize the conversion of three-phase AC power to obtain DC power; the n inverters are used to realize power inversion, and receive the speed command issued by the upper computer through the matching inverter controller, and run in the speed control mode, so that the n inverters all run at the same frequency, and jointly drive the multi-three-phase permanent magnet motor to rotate, and the speed adjustment range is 0 to the rated speed of the multi-three-phase permanent magnet motor, which is convenient for the multi-three-phase permanent magnet motor to be tested to perform data testing at any speed; the n rectifiers are used to realize the conversion of three-phase AC power to obtain DC power; the n inverters are used to realize power inversion, and receive the speed command issued by the upper computer through the matching inverter controller, and run in the speed control mode, so that the n inverters all run at the same frequency, and jointly drive the multi-three-phase permanent magnet motor to rotate, and the speed adjustment range is 0 to the rated speed of the multi-three-phase permanent magnet motor, which is convenient for the multi-three-phase permanent magnet motor to be tested to perform data testing at any speed; The rectifier is used to realize rectification, and receives the torque command issued by the host computer through the matching rectifier controller, and operates in the torque control mode, so that n rectifiers jointly provide the load torque of the multi-three-phase permanent magnet motor, and its torque adjustment range is 0 to the rated torque of the multi-three-phase permanent magnet motor, so that the multi-three-phase permanent magnet motor under test can work under any torque load for data testing without the need for mechanical load, which greatly reduces the hardware and installation costs of the test system; the data acquisition module includes a speed measurement module, a temperature sensor module, and a vibration sensor module, the speed measurement module is used to measure the speed of the multi-three-phase permanent magnet motor, the temperature sensor module is used to measure the operating temperature of the multi-three-phase permanent magnet motor, and the vibration sensor module is used to measure the vibration degree of the multi-three-phase permanent magnet motor. The data acquisition module transmits the above-mentioned collected signals to the host computer through the CAN bus; the host computer is used to realize the monitoring of the collected data, and output the speed command and the torque command to the inverter group and the rectifier group.

[0006] Furthermore, the winding arrangement of the multi-three-phase permanent magnet motor can be a symmetrical distribution or an asymmetrical distribution structure.

[0007] Compared with the existing motor test platform, the utility model has the following beneficial effects:

[0008] The utility model designs a common bus multi-three-phase permanent magnet motor test device, so that all inverters are connected in parallel to the same DC bus power supply, so that half of the windings are in a power generation state and the other half of the windings are in a motoring state, thereby realizing energy feedback of rectification and inversion; the test device does not require a companion test motor, and the required power capacity is small, which effectively reduces the construction, installation and testing costs of the equipment and meets the requirements of performance testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a structural diagram of the utility model's common busbar multi-three-phase permanent magnet motor performance test device;

[0010] Figure 2 This is a control flow chart of the common bus multi-three-phase permanent magnet motor performance testing device of the utility model. DETAILED DESCRIPTION

[0011] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0012] like Figure 1As shown, a common bus multi-three-phase permanent magnet motor performance test device includes an uncontrolled rectifier, an inverter group consisting of n inverters and matching inverter controllers, a rectifier group consisting of n rectifiers and matching rectifier controllers, n≥2, a multi-three-phase permanent magnet motor, a data acquisition module, and a host computer; one end of the uncontrolled rectifier is connected to the AC power grid, and the other end is connected to the positive and negative poles of the DC bus; the DC ends of the inverter group and the rectifier group are both connected to the positive and negative poles of the DC bus to form a common bus structure; the multi-three-phase permanent magnet motor, as a tested motor, has 2n sets of three-phase winding single Element, wherein n sets of three-phase windings are respectively connected to the rectifier group, and n sets of three-phase windings are respectively connected to the inverter group. The arrangement of the windings of the multi-phase permanent magnet motor can be a symmetrical distribution or an asymmetrical distribution structure. Each set of three-phase windings adopts an independent neutral point connection, and its mechanical shaft output is in a no-load state; the uncontrolled rectifier is used to realize the conversion of three-phase alternating current into direct current; the n inverters are used to realize power inversion, receive the speed command issued by the upper computer through the matching inverter controller, and operate in the speed control mode, so that the n inverters all operate at the same frequency, The multi-phase permanent magnet motor is driven to rotate together, and the speed adjustment range is 0 to the rated speed of the multi-phase permanent magnet motor, which is convenient for the multi-phase permanent magnet motor to be tested to perform data testing at any speed; the n rectifiers are used to realize rectification, and receive the torque command issued by the host computer through the matching rectifier controller, and operate in the torque control mode, so that the n rectifiers jointly provide the load torque of the multi-phase permanent magnet motor, and the torque adjustment range is 0 to the rated torque of the three-phase permanent magnet motor, so that the multi-phase permanent magnet motor to be tested can work under any torque load for data testing without the need for mechanical load , greatly reducing the hardware and installation costs of the test system; the data acquisition module includes a speed measurement module, a temperature sensor module, and a vibration sensor module. The speed measurement module is used to measure the speed of the multi-phase permanent magnet motor, the temperature sensor module is used to measure the operating temperature of the multi-phase permanent magnet motor, and the vibration sensor module is used to measure the vibration degree of the multi-phase permanent magnet motor. The data acquisition module transmits the above-mentioned collected signals to the host computer through the CAN bus; the host computer is used to realize the monitoring of the collected data, and output the speed command and the torque command to the inverter group and the rectifier group.

[0013] Figure 2This is a control flow chart of a common bus multi-three-phase permanent magnet motor performance test device of the utility model. The steps of testing the multi-three-phase permanent magnet motor are as follows: first, the uncontrollable rectifier is connected to the AC power grid to provide power for the inverter and the rectifier; then, the speed command of the multi-three-phase permanent magnet motor is input through the host computer operation. After the inverter controller receives the speed command, n inverters are started to drive the multi-three-phase permanent magnet motor so that the multi-three-phase permanent magnet motor runs to the command speed, and the acceleration and deceleration of the multi-three-phase permanent magnet motor are realized through the host computer, and the operating state of the multi-three-phase permanent magnet motor at different speeds is tested; then, the torque command of the multi-three-phase permanent magnet motor is input through the host computer operation. After the rectifier controller receives the torque command, n rectifiers are controlled to provide load torque for the multi-three-phase permanent magnet motor, so that the multi-three-phase permanent magnet motor works under no-load, rated load and arbitrary speed conditions for testing.

[0014] The real-time speed of the multi-phase permanent magnet motor is measured by the speed measuring device for speed feedback; the temperature sensor measures the motor temperature of the multi-phase permanent magnet motor when it is running, which is used to monitor the motor temperature rise; the vibration sensor is used to measure the vibration condition of the multi-phase permanent magnet motor when it is running, which is used to determine whether the vibration requirements are met; the voltage and current sensor is used to measure the voltage and current data of the rectifier and inverter when the motor is running, which is used to determine the motor operation performance. After the data acquisition module collects the above measurement data, it is transmitted to the host computer system via the CAN bus for real-time monitoring of the multi-phase permanent magnet motor.

[0015] The present invention can realize the running state test of the multi-three-phase permanent magnet motor under different working conditions. By putting the inverter in the speed mode and the rectifier in the torque mode, the speed and torque of the multi-three-phase permanent magnet motor are controlled respectively. No mechanical load is required during the multi-three-phase permanent magnet motor testing, and single motor testing can be realized, thus saving a lot of equipment and installation costs. By connecting the rectifier and the inverter to the same DC bus, the electric energy generated by the multi-three-phase permanent magnet motor is converted into DC by the rectifier, and can then be used by the inverter through the DC bus, thus realizing energy feedback between the rectifier and the inverter unit, simplifying the equipment installation, saving costs, and the entire testing process is very energy-saving.

[0016] The above contents are only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed in the present invention shall fall within the protection scope of the patent claims of the present invention.

Claims

1. Common bus multi-three-phase permanent magnet motor performance test device, characterized by: It includes an uncontrolled rectifier, an inverter group consisting of n inverters and matching inverter controllers, a rectifier group consisting of n rectifiers and matching rectifier controllers, a multi-phase permanent magnet motor, a data acquisition module and a host computer, n≥2; One end of the uncontrolled rectifier is connected to the AC grid, and the other end is connected to the positive and negative poles of the DC bus; the DC ends of the inverter group and the rectifier group are connected to the positive and negative poles of the DC bus to form a common bus structure; the multi-three-phase permanent magnet motor is used as the tested motor, and has 2n sets of three-phase winding units, wherein n sets of three-phase windings are respectively connected to the rectifier group, and n sets of three-phase windings are respectively connected to the inverter group, and each set of three-phase windings is connected with an independent neutral point, and its mechanical shaft output is in a no-load state; the uncontrolled rectifier is used to realize the conversion of three-phase AC power to obtain DC power; the n inverters are used to realize power inversion, and receive the speed command issued by the upper computer through the matching inverter controller, and run in the speed control mode, so that the n inverters all run at the same frequency, and jointly drive the multi-three-phase permanent magnet motor to rotate, and the speed adjustment range is 0 to the rated speed of the multi-three-phase permanent magnet motor, which is convenient for the multi-three-phase permanent magnet motor to be tested to perform data testing at any speed; the n rectifiers are used to realize the conversion of three-phase AC power to obtain DC power; the n inverters are used to realize power inversion, and receive the speed command issued by the upper computer through the matching inverter controller, and run in the speed control mode, so that the n inverters all run at the same frequency, and jointly drive the multi-three-phase permanent magnet motor to rotate, and the speed adjustment range is 0 to the rated speed of the multi-three-phase permanent magnet motor, which is convenient for the multi-three-phase permanent magnet motor to be tested to perform data testing at any speed; The rectifier is used to realize rectification, and receives the torque command issued by the host computer through the matching rectifier controller, and operates in the torque control mode, so that n rectifiers jointly provide the load torque of the multi-three-phase permanent magnet motor, and its torque adjustment range is 0 to the rated torque of the multi-three-phase permanent magnet motor, so that the multi-three-phase permanent magnet motor under test can work under any torque load for data testing without the need for mechanical load, which greatly reduces the hardware and installation costs of the test system; the data acquisition module includes a speed measurement module, a temperature sensor module, and a vibration sensor module, the speed measurement module is used to measure the speed of the multi-three-phase permanent magnet motor, the temperature sensor module is used to measure the operating temperature of the multi-three-phase permanent magnet motor, and the vibration sensor module is used to measure the vibration degree of the multi-three-phase permanent magnet motor. The data acquisition module transmits the above-mentioned collected signals to the host computer through the CAN bus; the host computer is used to realize the monitoring of the collected data, and output the speed command and the torque command to the inverter group and the rectifier group.

2. The common bus multi-three-phase permanent magnet motor performance testing device according to claim 1 is characterized in that: The winding arrangement of a multi-three-phase permanent magnet motor can be a symmetrical distribution or an asymmetrical distribution structure.

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