A method and system for online identification of rotor flux linkage of permanent magnet synchronous motor

A permanent magnet synchronous motor and rotor flux linkage technology, which is applied in the field of rotor flux linkage online identification, can solve the problems of overcurrent and failure of the air conditioner to start, and achieves the effect of small calculation amount, simple realization, and prevention of demagnetization phenomenon.
CN105227024BActive Publication Date: 2017-11-10GD MIDEA AIR-CONDITIONING EQUIP CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
GD MIDEA AIR-CONDITIONING EQUIP CO LTD
Publication Date
2017-11-10

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Abstract

The invention relates to a method and system for on-line identification of rotor flux linkage of a permanent magnet synchronous motor, comprising S1, respectively acquiring the previous rotor flux linkage value and intermediate variable value; And the intermediate variable value is substituted into the rotor flux linkage calculation formula to calculate the current rotor flux linkage value. The present invention adopts the classical dq-axis mathematical model, and uses the recursive least squares method. Through the estimation of the rotor flux linkage, the state of the permanent magnets of the rotor can be effectively known, and the demagnetization phenomenon caused by the excessive current can be effectively prevented. The problem of frequent shutdowns is solved, thereby solving the related complaints of consumers; the invention is simple to implement, has a small amount of calculation, does not need to increase any hardware cost, can be popularized in a large area of ​​engineering practice, and is suitable for different types of permanent magnet synchronous motors.
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Description

technical field

[0001] The invention relates to the field of motor drive control, in particular to a method and system for online identification of rotor flux linkage of a permanent magnet synchronous motor. Background technique

[0002] For motors, convex permanent magnet synchronous motors are generally used. The rotor flux linkage is a key parameter that reflects the performance of the motor. In air conditioning applications, the permanent magnet synchronous motor is the main component of the compressor. If the compressor has too much current and the motor demagnetizes, it will have a great impact on the performance of the air conditioner. Impact. If the original parameters are still used to set in the case of demagnetization, then the air conditioner will have problems such as overcurrent or failure to start.

[0003] At the same time, the rotor flux parameters of the motor also play a very important role in vector control. For example: position estimation, MTPA (maxi...

Claims

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