Method and device for calculating rotor position of surface-mounted permanent magnet synchronous motor based on sliding mode observer

Abstract

The invention provides a method and device for calculating the rotor position of a surface-mounted permanent magnet synchronous motor based on a sliding mode observer, which introduces the cosine saturation segmental function of the adaptive boundary layer thickness into the sliding mode control rate, and combines the quasi-unitary algorithm , effectively reduce high-frequency chattering and improve the calculation accuracy of rotor position and speed; firstly, according to the reference value of stator voltage, the actual value of stator current and the observed value of rotor electrical angular velocity, the standard unit value of back electromotive force sliding mode observation standard unit is calculated by sliding mode observer ; and then according to the back EMF sliding mode observation standard unit value and the rotor electrical angular velocity observation value through the second order generalized integrator to calculate the back electromotive force observation standard unit value; finally according to the back electromotive force observation standard unit value through the phase-locked loop calculation to obtain the rotor Electric angular velocity observation value and rotor electric angle observation value; the rotor position calculation method proposed by the present invention has high reliability and strong robustness, and meets the requirements of high-speed hydrogen pump, air compressor and other permanent magnet synchronous motor driving fields on system reliability and efficiency. requirements.

Description

Rotor position calculation method of surface-mounted permanent magnet synchronous motor based on sliding mode observer and device technical field The present invention relates to motor control technical field, especially a kind of permanent magnet synchronous motor rotor based on sliding mode observer Location calculation method. Background technique Permanent magnet synchronous motor has the characteristics of high power density, high efficiency, compact structure and high reliability. Fields such as wind power generation, household appliances and electric vehicles have been widely used. In order to realize the high-performance control of permanent magnet synchronous motor To meet the precise control of speed and current, the motor drive system must accurately obtain the rotor position in real time. The mechanical sensors of traditional direct position detection mainly include resolvers, encoders, Hall sensors, etc. It increases the cost of the motor, increases...

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Problems solved by technology

However, the sliding mode observer control is a discontinuous control. The unideality of the switch and the inertia of the system will cause high-frequency chattering in the system, which greatly reduces the accuracy of rotor position estimation.

In addition, the speed change will affect the amplitude of the back electromotive force, thereby affecting the system bandwidth, reducing the anti-speed disturbance ability of fixed parameters, and affecting the observation accuracy

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