Low-uncertainty stray loss test system of motor

Abstract

The invention discloses a low-uncertainty stray loss test system of a motor, which is characterized by comprising a rectifying unit, a test power supply, a simulating constant torque load and a torque / rotating speed sensor, wherein the rectifying unit respectively connects direct current obtained by bridge-rectifying alternating current commercial power to the test power supply and the simulating constant torque load; the test power supply is sequentially connected with an electrical parameter measuring control, output control and test motor after modulating the direct current into frequency converting static alternating current power supply; the simulating constant torque load is connected with a load motor after modulating the direct current into a controllable power supply of a constant torque load; and the torque / rotating speed sensor is respectively connected with a data measurement and test motor and the load motor. Compared with the prior art, the invention has the advantages of simple test system, convenient operation, high test precision and good stability, can meet an efficiency test of an efficient and superefficient motor of 0.37-375kW, has an uncertainty value lower than 0.4 percent and lays a certain foundation for China to be dedicated to research and development of the high-efficiency motor.

Description

technical field [0001] The invention relates to the technical field of electromechanical equipment detection, in particular to a low-uncertainty stray loss testing system for motors. Background technique [0002] At present, many countries in the world (including my country) are actively participating in the work of energy-saving motor systems. The International Electrotechnical Commission IEC / TC2 proposed to formulate a motor energy efficiency classification standard in 2006, which divides the motor efficiency into four levels: IE1, IE2, IE3, and IE4. The standard efficiency index coverage: 0.75 ~ 370kW, the number of poles is 2, 4, 6 poles, divided into 50Hz and 60Hz two types of indicators, the standard was officially released at the end of 2008. The efficiency grades in the motor product markets of various countries are as follows: the markets of the United States, Canada, Australia and other countries are IE2 efficiency grades, which are the minimum mandatory standards...

AI Technical Summary

Problems solved by technology

[0005] This is a new requirement for the Chinese motor industry: (1) There is no such literature on the uncertainty evaluation method of the motor stray loss and efficiency test in the world; (2) The two stray loss test methods that have been used in China are both It is a high-uncertainty method. The US IEEE112B method recommended by the IEC60034-2-1 standard and the EH-star method introduced by Europe are basically not mastered in my country. It is necessary to study the uncertainty of these two methods and choose one of them as the test method. ; (3) To achieve efficient low-uncertainty testing, it is necessary to study more accurate mathematical models and test data correction techniques, and to realize automatic control measurement

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