A motor test variable frequency power supply system

Abstract

The invention discloses an electrical motor test variable-frequency power source system. The electrical motor test variable-frequency power source system comprises two four-quadrant cascade connection type frequency converters, motors and a contactor, wherein the two four-quadrant cascade connection type frequency converters respectively drag one motor to work or simultaneously drag the two motors which are linked in a coaxial and rigid mode to conduct an opposite-dragging test. When the two four-quadrant cascade connection type frequency converters run independently, the contactor is switched off, and the two four-quadrant cascade connection type frequency converters conduct motor tests with different voltage levels respectively. When the two four-quadrant cascade connection type frequency converters run independently, the contactor is switched off, and the two motors are linked in the coaxial and rigid mode, the two four-quadrant cascade connection type frequency converters conduct motor opposite-dragging tests with different voltage levels. When the two four-quadrant cascade connection type frequency converters run in a parallel connection mode, the contactor is switched on, and the two four-quadrant cascade connection type frequency converters complete a motor test with a higher capacity level. According to the electrical motor test variable-frequency power source system, driving capability of the power source system can be greatly improved, the two motors can be connected in parallel to conduct driving or the two motors can independently and respectively conduct driving, relevant rest requirements of motors with different voltage levels and different capacity levels can be met, and four-quadrant transmission of the motors can be achieved.

Description

technical field [0001] The invention relates to a power supply system, in particular to a variable frequency power supply system applied to energy feedback type motor tests. Background technique [0002] Motors are widely used in power plants, oil fields, petrochemicals, mines, metallurgy, chemicals, building materials and other industries. In recent years, with the rapid development of my country's national economy, the market demand for motors has become increasingly strong, and the requirements for the quality of motors have also become higher and higher. The motor test is one of the important means to test the quality of the motor, and its accuracy and reliability are closely related to the quality of the motor test power supply. In the motor industry, in the past, generator sets were mainly used as motor test equipment for motor testing. This method is restricted by the capacity of the equipment, and cannot meet the requirements of motor testing in the case of large ca...

AI Technical Summary

Problems solved by technology

However, the existing technologies 2 and 3 adopt the energy circulation scheme of the common DC bus, and the output harmonic content is large, and a special output filter device needs to be added, and the rated capacity output of multiple voltage levels cannot be realized.

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