Frequency changer, motor testing system and method and mounting method

Abstract

The invention relates to a frequency changer, a motor testing system and method and a mounting method. The system comprises a control cabinet, an asynchronous motor driven frequency changer, an energyfeedback unit, a permanent magnetic synchronous motor driven frequency changer, a tested voltage current sensor, a system voltage current sensor and a testing stand, the testing stand comprises a mounting base, a triphase alternating-current asynchronous motor, a permanent magnetic synchronous motor, a torque sensor, a coupler, a speed reducer and a lifting movable motor mounting support, input ends P and N of the permanent magnetic synchronous motor driven frequency changer are connected with those of the energy feedback unit, and the output end of the energy feedback unit is connected with380V of a power grid. Energy input to the testing system by the power grid outside is reduced, so that the objectives of saving energy and protecting environment.

Description

technical field [0001] The invention relates to the technical field of performance testing of an AC asynchronous frequency converter and a three-phase asynchronous motor, in particular to a test system, a test method and an installation method for a recyclable energy-recyclable frequency converter and a three-phase asynchronous motor. Background technique [0002] There are three main types of existing inverter or motor testing systems and methods: [0003] One is to test various functions directly with the motor load, that is, the inverter is powered by an external power grid, and the output three-phase is connected to the motor. By changing the parameters of the inverter, observe whether the functions such as motor rotation are normal. This test method is the most common, and the output parameters of the motor and frequency converter cannot be read, and the load is not variable. [0004] Second, at present, the traditional excitation debugging is widely used in the domest...

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Problems solved by technology

This test method is the most common, the output parameters of the motor and the inverter cannot be read, and the load is not variable

[0004] Second, at present, the traditional excitation debugging is widely used in the domestic inverter and motor load test system. Compared with the energy recovery system, the traditional excitation motor test system consumes more energy, and the excitation part is prone to heat damage and requires periodic maintenance. replace

[0005] The third is to use the method of asynchronous motors to hug each other. Through the coaxial of the system motor and the tested motor, and the common DC bus of the system frequency converter and the tested frequency converter, although the energy recovery and the load of the tested frequency converter and the motor can be achieved. Adjusting parameters can read and store functions, but it has a disadvantage that the initial parameters set by the tested inverter and the system inverter need to be consistent, and the direction of the motor is opposite. After running to the set frequency, by changing the system inverter The parameter frequency is loaded on the frequency converter and the motor under test, that is to say, the frequency converter and the motor are set to have the same acceleration and deceleration time and the same frequency during the start-up acceleration and deceleration stop process, so the load test cannot be carried out during the start-up acceleration and deceleration stop process. A no-load test, for the inverter test, low-frequency load acceleration start, and low-frequency load deceleration stop are the most important performance manifestations of the inverter

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