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A Method for Estimating Rotor Position and Speed ​​of Permanent Magnet Synchronous Motor

A permanent magnet synchronous motor, rotor position technology, applied in the control of generator, motor control, motor generator control and other directions, can solve the problem of speed asymmetry permanent magnet synchronous motor sliding mode observer and so on

Active Publication Date: 2021-04-30
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the deficiencies of the prior art, the present invention improves the existing sliding mode observer, aiming to solve the chattering problem of the sliding mode observer of the permanent magnet synchronous motor caused by the asymmetry of approach speeds on both sides of the sliding mode surface, and improve the position and Velocity Estimation Accuracy

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  • A Method for Estimating Rotor Position and Speed ​​of Permanent Magnet Synchronous Motor

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[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0035] A back EMF feedforward sliding mode observer, the back EMF feedforward sliding mode observer includes a current observation state device, a comparator, a sign function unit, a feedforward back EMF calculation unit, and a bandpass filter (BPF) and phase-locked loop (PLL);

[0036] The current observation state device is connected with a sign function unit, and the sign function unit is connected with a feedforward back EMF calculation unit, a...

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Abstract

The invention discloses a method for estimating the rotor position and speed of a permanent-magnet synchronous motor based on a back-EMF feedforward sliding mode observer. The current observer is connected with a sign function unit, the sign function unit is connected with a feed-forward back EMF calculation unit, the current observer and a band-pass filter, and the band-pass filter is connected with a phase-locked loop. The purpose of the invention is to solve the chattering problem of the sliding mode observer of the permanent magnet synchronous motor caused by the asymmetry of approaching speeds on both sides of the sliding mode surface, and improve the position and speed estimation accuracy.

Description

technical field [0001] The invention belongs to the technical field of motor control; in particular, it relates to a method for estimating the rotor position and speed of a permanent magnet synchronous motor based on a back EMF feedforward sliding mode observer. Background technique [0002] In occasions such as low cost, poor use environment, and harsh space requirements, position sensorless technology is widely used in permanent magnet synchronous motor control systems to replace mechanical position sensors. The back EMF of permanent magnet synchronous motor contains angle and velocity information, so position sensorless methods based on back EMF estimation are widely used, these methods include sliding mode observer, Romberg observer, adaptive observer, extended Kalman filter device etc. Among them, the sliding mode observer has the advantages of simple structure and good robustness, and is a more commonly used position estimation method. However, the switching function...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/18H02P21/24H02P21/13H02P21/00H02P25/022
CPCH02P21/0007H02P21/13H02P25/022H02P2207/05H02P21/18H02P21/24
Inventor 安群涛陈长青马腾张建秋杨宇达
Owner HARBIN INST OF TECH
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