Current ring starting method for permanent magnet synchronous motor with variable PID parameters

Abstract

The invention provides a current ring starting method for a permanent magnet synchronous motor with variable PID parameters. The current ring starting method comprises the steps as follows: a three-phase winding of the motor is powered on to enable the N pole of a rotor to be stopped in the position of an A-axis direction of an ABC coordinate system, wherein the rotor position angle <theta> is equal to 0 at the moment; a three-phase symmetrical sine alternating voltage is pumped to the three-phase winding of the motor, the voltage frequency f is constantly increased, and the motor starts acceleration; the set rotor position angle <theta> is increased progressively; after the motor is started, a position estimator begins to estimate a rotor position <theta>', and an error value <delta> <theta> between the <theta>' and <theta> is calculated; the parameters of Kp, Ki and Kd of the current ring are adjusted through a setting module according to the estimation error <delta> <theta>, a motor stator excitation component current error value <delta>Id and a torque component current error value <delta>Iq, and after configuration is completed, the current ring is executed. By virtue of the current ring starting method, the no-position start of the permanent magnet synchronous motor can be more reliable and safer; and in addition, the control cost is low, and the control system is high in dynamic performance and high in anti-interference capability.

Description

technical field [0001] The invention relates to the field of starting a permanent magnet synchronous motor, in particular to a method for starting a permanent magnet synchronous motor with a variable PID parameter current loop. Background technique [0002] The permanent magnet synchronous motor adopts electronic commutation, which can avoid the noise and loss caused by the traditional mechanical transmission device, can improve the operating efficiency of the system, reduce vibration noise, and has many incomparable advantages compared with other motors. [0003] In the control of permanent magnet synchronous motors, it is necessary to determine the position and speed information of the rotor. Traditionally, the installation of position sensors must affect the structure of the motor, which usually increases the cost and complexity of the system. The use of non-position control can reduce the cost of control. Improve the running stability and reliability of the motor. [00...

AI Technical Summary

Problems solved by technology

[0009] Purpose of the invention: In order to solve the technical problems that the parameters of the PID controller cannot be adjusted in the current loop control of the above-mentioned traditional permanent magnet synchronous motor, and the technical problems of overcurrent and out-of-step are prone to occur, the present invention proposes a variable PID parameter current loop of the permanent magnet synchronous motor start method

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