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Observation method of permanent magnet synchronous motor stator flux linkage based on extended flux linkage observer

A technology of permanent magnet synchronous motor and flux observer, which is applied to the control of generators, motor generators, electronically commutated motors, etc., and can solve problems such as strong dependence on motor parameters

Active Publication Date: 2015-10-28
黄山市开发投资集团有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is a method to construct a full-order state observer of the stator flux linkage in the dq coordinate system, but this method not only requires the accurate orientation angle of the rotor flux linkage, but also uses more motor parameters, and its motor parameters are highly dependent

Method used

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  • Observation method of permanent magnet synchronous motor stator flux linkage based on extended flux linkage observer
  • Observation method of permanent magnet synchronous motor stator flux linkage based on extended flux linkage observer
  • Observation method of permanent magnet synchronous motor stator flux linkage based on extended flux linkage observer

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Embodiment Construction

[0057] The present invention will be further elaborated below in conjunction with the accompanying drawings and embodiments.

[0058] see figure 1 , the signal acquisition part, u αβ and i αβ is by sampling the stator line voltage u ab , stator line voltage u bc , Stator A-phase current i A , Stator B-phase current i B , Stator C-phase current i C , and obtained through transformation from a three-phase stationary coordinate system to a two-phase stationary coordinate system, and the actual electrical angular velocity ω is obtained by using a photoelectric rotary encoder. The present embodiment carries out as follows:

[0059] Step 1. Sampling to obtain the real-time measured motor stator line voltage u ab and u bc , three-phase stator current i A i B i C and rotor electrical angular velocity ω, and for u ab , u bc i A i B i C Perform coordinate transformation to obtain the voltage and current u on the αβ coordinate system αβ i αβ ;

[0060] 1) First, use t...

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Abstract

The invention discloses a PMSM stator flux linkage observation method which is characterized in that an extension flux linkage observer is established according to a motor stator voltage phasor u alpha beta, a stator current phasor i alpha beta and a rotor electric angular speed omega in a two-phase static coordinate system (alpha beta coordinate system for short), on the basis of the theory of a state observer and according to a mathematical model of the PMSM in the alpha beta coordinate system, the motor stator voltage phasor u alpha beta, the stator current phasor i alpha beta and the rotor electric angular speed omega are obtained through collection and calculation, and then the relation between the stator flux linkage and the extension flux linkage is utilized for observing a rotor flux linkage psis. According to the PMSM stator flux linkage observation method, the problem of direct-current bias and integral saturation caused by the pure integral stator flux linkage observation method can be solved, the problems of the amplitude value and phase deviation or waveform distortion caused by an improved integrator are solved, and the advantage that parameters of the pure integral stator flux linkage observer are good in robustness is reserved. Due to the fact that only a minimum-order observer is required, engineering practice is benefited. The stator flux linkage observation method can be applied to a surface-mounted-type SPMSM and an inserted-type SPMSM and have the advantage of being good in universality.

Description

technical field [0001] The invention relates to a flux linkage observation method, in particular to a permanent magnet synchronous motor stator flux observation method. Background technique [0002] Permanent magnet synchronous motor (referred to as PMSM) has the advantages of high efficiency, high power density, large torque output, small pulsation, fast dynamic response, wide speed range, etc., and is currently widely used in the fields of wind power generation systems and electric vehicle electric drive systems . [0003] The common PMSM speed control system usually consists of a speed outer loop and a current inner loop to form a double closed-loop control form, and the inner loop current given value is given by the speed closed-loop regulator, so there is generally no need for accurate electromagnetic torque observation. In wind power generation and electric vehicle systems, the PMSM drive controller generally does not need speed closed-loop control, and is often requi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/14
Inventor 杨淑英占琦张兴谢震郭磊磊
Owner 黄山市开发投资集团有限公司
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