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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.

Active Publication Date: 2017-11-10
GD MIDEA AIR-CONDITIONING EQUIP CO LTD +1
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Problems solved by technology

If the original parameters are still used for setting in the case of demagnetization, then the air conditioner will have problems such as overcurrent or failure to start.

Method used

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

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Embodiment Construction

[0035] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0036] figure 1 It is a flow chart of the online identification method of the rotor flux linkage of the permanent magnet synchronous motor according to the first embodiment of the present invention.

[0037] Such as figure 1 As shown, an online identification method of rotor flux linkage of a permanent magnet synchronous motor includes the following steps:

[0038] S1, obtain the previous rotor flux value and intermediate variable value respectively.

[0039] S2. Substituting the previous rotor flux linkage value and the intermediate variable value obtained in S1 into the rotor flux linkage calculation formula to calculate the current rotor flux linkage value.

[0040] The rotor flux calculation formula of the pr...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/14
Inventor 陈毅东
Owner GD MIDEA AIR-CONDITIONING EQUIP CO LTD
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