Test method for mechanical characteristics of double-branch AC permanent magnet motor

Abstract

The invention discloses a method for testing the mechanical characteristics of a double-branch AC permanent magnet motor, which comprises the steps of connecting the power generation branch to an adjustable resistive and inductive load, and the electric branch connected to a motor control driver; controlling the operation of the driver, the load is purely resistive, and testing the motor Speed, electric branch current waveform and phase voltage value, power generation branch current waveform and phase voltage value and power factor angle; the motor stops running, disconnect the generator unit load, and calculate the winding resistance; test the AC and direct axis inductance of the motor; test the Mutual inductance between the windings of the electric branch circuit and the generating branch circuit; test the no-load back EMF of the motor and obtain the total magnetic flux Φ of each pole of the permanent magnet 0 ; Re-run the motor to obtain the iron loss of the motor; calculate the output torque of the motor; change the resistance value and inductance value of the load resistance connected to the generator unit end, repeat the above steps, and obtain the mechanical characteristic curve. The invention does not require external equipment to meet the general mechanical characteristic test requirements of permanent magnet synchronous motors, and has simple structure, stable performance and reliable data.

Description

technical field [0001] The invention relates to a method for testing mechanical characteristics, in particular to a method for testing the mechanical characteristics of a double-branch AC permanent magnet motor. The invention belongs to the technical field of motor testing. Background technique [0002] At present, the test methods for the mechanical characteristics of permanent magnet synchronous motors are relatively mature, most of which are direct test methods, that is, the motor is installed on the test bench, the motor itself runs electrically, and a dynamometer is added as a mechanical load at the same time, and then tested at different speeds. The output torque of the motor is used to complete the test of the mechanical characteristics of the motor. [0003] However, when using this method to test the mechanical characteristics of the permanent magnet motor, it is necessary to add a dynamometer or a mechanical load device, which virtually increases the equipment cond...

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Problems solved by technology

[0003] However, when using this method to test the mechanical characteristics of the permanent magnet motor, it is necessary to add a dynamometer or a mechanical load device, which virtually increases the equipment conditions required for the test.

Moreover, the high-power low-speed permanent magnet synchronous motor runs at a low speed, generally not exceeding 200rpm, and its torque is very large, so a large-capacity DC motor and its auxiliary equipment are required as loads, which are not available in some laboratories or research institutes. Hundreds of kilowatts or even megawatts of DC motor load test conditions, so this kind of test cannot be completed

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