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A speed sensorless control method and system for a permanent magnet motor

A speed sensorless, permanent magnet motor technology, applied in control systems, vector control systems, motor generator control, etc., can solve problems such as poor control performance and complex design of speed controller parameters

Active Publication Date: 2021-08-20
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides a speed sensorless control method and system of a permanent magnet motor, which is used to solve the problem that the parameter design of the speed controller is relatively complicated in the prior art, and the parameters of the speed controller are related to the automatic The technical problem of poor control performance due to the coupling of adaptive law parameters

Method used

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  • A speed sensorless control method and system for a permanent magnet motor
  • A speed sensorless control method and system for a permanent magnet motor
  • A speed sensorless control method and system for a permanent magnet motor

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Embodiment 1

[0041] A speed sensorless control method for a permanent magnet motor, such as figure 1 shown, including the following steps:

[0042] S1. Obtain a reference model and an adjustable model based on the mathematical model of the permanent magnet synchronous motor; wherein, the reference model is a matrix equation with the actual value of the stator current as a state variable; the adjustable model is a matrix equation with the observed value of the stator current as a state variable;

[0043] Specifically, based on the mathematical model of the permanent magnet synchronous motor, the matrix equation with the stator current as the state variable is derived, the mathematical model of the permanent magnet synchronous motor in the two-phase rotating coordinate system is transformed into a form with the stator dq axis current as the state variable, and the rotational speed Constrained in the system matrix, the following expression is obtained:

[0044]

[0045] Among them, i d i...

Embodiment 2

[0091] A speed sensorless control system for a permanent magnet motor, comprising: a reference model and an adjustable model building block, a speed and load torque adaptive law building block, a speed controller building block, and a motor control module;

[0092] The reference model and adjustable model building blocks are used to obtain the reference model and adjustable model based on the permanent magnet synchronous motor mathematical model; where the reference model is a matrix equation with the actual value of the stator current as the state variable; the adjustable model is the stator current observation Values ​​are matrix equations of state variables;

[0093] The speed and load torque adaptive law building block is used to make the difference between the reference model and the adjustable model to obtain the current error state equation, and build an error system based on the current error state equation; based on Popov's ultra-stability theory and the obtained error...

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Abstract

The invention discloses a speed sensorless control method and system of a permanent magnet motor. After obtaining a reference model and an adjustable model based on the mathematical model of the permanent magnet synchronous motor, an error system is further constructed based on the reference model and the adjustable model; Stability theory and error system, combined with the motor motion equation to obtain the expression of the adaptive law of the speed and load torque; by introducing the feedforward compensation of the load torque in the speed error proportional control, the speed controller is constructed; in the running state of the motor, Based on the actual current and the observed current, the rotational speed and load torque are observed simultaneously by using the adaptive law expression of the rotational speed and load torque, and the speed sensorless control of the motor is realized by adjusting the parameters of the speed controller. The invention can observe the speed and load torque at the same time, and by introducing the load torque feed-forward control method, it can realize the disturbance suppression of the load torque and the no-static control of the speed controller under a single parameter, and the system control performance is better .

Description

technical field [0001] The invention belongs to the technical field of speed sensorless control of permanent magnet motors, and more specifically relates to a speed sensorless control method and system of permanent magnet motors. Background technique [0002] Permanent magnet synchronous motors have the advantages of high power factor, high efficiency, and high starting torque, and are widely used in industrial production, electric vehicles, aerospace and other fields. For permanent magnet synchronous motors, speed and rotor position information are essential as long as closed-loop control is performed. However, the installation of the position sensor increases the system cost and hardware complexity, and it is difficult to apply to harsh working conditions such as high temperature and vibration. Therefore, the realization of permanent magnet synchronous motor speed sensorless control has broad application prospects, and its research has attracted the attention of scholars ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/00H02P21/18
CPCH02P21/0017H02P21/18
Inventor 徐伟唐一融王磊
Owner HUAZHONG UNIV OF SCI & TECH