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PMSM (permanent magnet synchronous motor) rotor position and rotating speed estimation method based on decoupling adaptive observer

A permanent magnet synchronous motor and rotor position technology, which is applied in the direction of control of generators, motor generators, and electromechanical transmissions, can solve problems such as unsatisfactory low-speed performance and rotor position deviation, and achieve improved dynamic performance and robustness. good sex effect

Active Publication Date: 2016-08-31
ZHEJIANG UNIV
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Problems solved by technology

However, when there is an error in the model parameters, the estimated rotor position will have a large deviation, and the low-speed performance is not ideal

Method used

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  • PMSM (permanent magnet synchronous motor) rotor position and rotating speed estimation method based on decoupling adaptive observer
  • PMSM (permanent magnet synchronous motor) rotor position and rotating speed estimation method based on decoupling adaptive observer
  • PMSM (permanent magnet synchronous motor) rotor position and rotating speed estimation method based on decoupling adaptive observer

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Embodiment Construction

[0047] In order to describe the present invention in more detail, the technical solution of the present invention will be described in detail below with reference to the drawings and specific embodiments.

[0048] Such as figure 1 As shown, the present invention involves three sets of coordinate systems: a stationary two-phase α-β coordinate system, a d-q coordinate system based on the actual position, and a γ-δ coordinate system based on the estimated position. Usually the permanent magnet synchronous motor model is established in the d-q coordinate system. Since the rotor position is unknown in the actual position sensorless control system, the motor model needs to be transformed to the γ-δ coordinate system based on the estimated position.

[0049] The present invention constitutes a decoupling adaptive observer by constructing a reference model, an adjustable model, and an adaptive rate of rotor position and speed. Its principle is as follows figure 2 Shown. The decoupled vol...

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Abstract

The invention discloses a PMSM (permanent magnet synchronous motor) rotor position and rotating speed estimation method based on a decoupling adaptive observer, and the method comprises the steps: taking a decoupling voltage vector as an input quantity, and building a decoupling PMSM mathematic model; taking the mathematic model as a reference model, and constructing an adjustable model based on the estimated rotor position and rotating speed; carrying out the subtraction of the reference model and the mathematic model, carrying out Laplace transformation, obtaining the quantitative relation among a current estimation error, a rotor position estimation error and a rotating speed estimation error, and determining the adaptive rate of the observer according to the above. The built decoupling adaptive observer can achieve the decoupling of the rotor position and the rotating speed estimation, and the estimated rotor position and rotating speed are corrected at the same time through the current estimation error. The method belongs to a parallel estimation structure, so the method is higher in dynamic response performances.

Description

Technical field [0001] The invention belongs to the technical field of motor control, and specifically relates to a method for estimating the rotor position and rotational speed of a permanent magnet synchronous motor based on a decoupling adaptive observer. Background technique [0002] Permanent magnet synchronous motors have the characteristics of high torque density, high efficiency, and superior dynamic performance. They are widely used in the fields of electric traction, wind power generation, new energy vehicles, electric drives and robots. The current variable frequency speed regulation system of permanent magnet synchronous motors generally adopts automatic operation mode: the position of the permanent magnet synchronous motor rotor is detected by a mechanical position sensor installed coaxially with the rotor, and then the output of the inverter is controlled according to the rotor position and speed of the motor Frequency to realize the speed control of permanent magne...

Claims

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Application Information

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IPC IPC(8): H02P21/18
Inventor 杨家强毛永乐
Owner ZHEJIANG UNIV
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