Speed Sensorless Control Method

A technology without a speed sensor and a control method, which is applied in control systems, motor control, and generator control, can solve problems such as the influence of motor dynamic characteristics, integral saturation, etc., and achieve the goal of solving integral saturation problems, suppressing disturbances, and ensuring stability Effect

Inactive Publication Date: 2019-01-11
SHANGHAI INST OF TECH
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Problems solved by technology

The permanent magnet synchronous motor control system using the traditional PI controller to control the high-frequency injection method of the speed loop has integral saturation, which will affect the dynamic characteristics of the motor, especially at low speeds. The improved speed loop controller is the industry a mainstream direction of

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Embodiment Construction

[0042] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0043] Aiming at the integral saturation phenomenon that is easy to appear in the PI controller in the PMSM speed control system based on the traditional high-frequency injection method, the problem of dynamic performance degradation is caused. The speed sensorless control method provided by the present invention combines the high-frequency injection method with the cerebellum model neural network, and adjusts the PID parameters online through the CMAC-PID intelligent controller, so that the motor has good...

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Abstract

The invention provides a speed sensorless control method, comprising the following steps: a deviation between the given speed of the motor and the feedback value of the rotor angular speed is adjustedby the CMAC-PID intelligent controller and the torque current is output, and the deviation between torque current and torque current feedback is regulated by PI regulator, and the output voltage is uq. The deviation between the excitation current and the feedback value of the excitation current is regulated by the PI regulator and the output voltage ud is obtained. The voltage uq and the voltageud are inversely transformed to obtain two-phase control voltages. The injected high-frequency carrier signal is superposed on the two-phase control voltage, and the superposed voltage signal is usedas the input signal of SVPWM modulation. The output of SVPWM modulates six PWM pulse signals needed to control the on-off of the trinomial inverter switching devices, and the inverter outputs three-phase voltage to control the permanent magnet synchronous motor. Thus, the purpose of adjusting PID parameters on line is realized, and the motor has good dynamic and static performance in a wide rangeof speed.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a speed sensorless control method. Background technique [0002] Permanent Magnet Synchronous Motor (PMSM) has the advantages of high power density, high energy conversion efficiency, wide speed range, small size, light weight, etc., and has been widely used in industrial, civil, military and other fields. [0003] Vector control and direct torque control are widely used in permanent magnet synchronous motor speed control systems, and can meet most control requirements. Both conventional control methods require the installation of position sensors to determine the position and speed information of the motor rotor, but this also brings a series of problems to the transmission system, such as increasing the moment of inertia of the motor shaft, increasing system cost, and reliability. The performance is reduced, and it is also accompanied by the defect of difficult installat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/18H02P21/00H02P21/18H02P21/24H02P27/08
CPCH02P6/183H02P21/0014H02P27/08H02P2203/03H02P2203/11H02P21/18H02P21/24
Inventor 王步来徐强强刘祥盛张海刚杨园园任攀元卞鹏苑宇阳卢煜
Owner SHANGHAI INST OF TECH
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