A sensorless control method and verification system for delta-connected permanent magnet synchronous motors

Abstract

The invention relates to a method for controlling a delta-connected permanent magnet synchronous motor without a position sensor, including performing pulse width modulation output of a delta-connected permanent magnet synchronous motor; performing coordinates of a delta-connected permanent magnet synchronous motor without a position sensor Transformation; second-order improved coupled sliding mode position estimation. The invention also relates to a system for verifying the control function of the delta-connected permanent magnet synchronous motor without a position sensor. The method and verification system for controlling the delta-connected permanent magnet synchronous motor without a position sensor according to the present invention can realize the smooth switching between the start-up strategy and the closed-loop strategy of sliding mode estimation speed with load, and can realize the step size of the speed under load. The rapid acceleration and deceleration steps of 1000r / min (the rated speed of the delta connection sensorless permanent magnet synchronous motor used in the experiment is 1500r / min, which is a low-speed air pump motor for vehicles), has good dynamic response ability and steady state Anti-load interference ability.

Description

technical field [0001] The present invention relates to the field of electric drive technology, in particular to the field of MCU control methods for vehicle air pumps, in particular to a method for controlling a delta-connected permanent magnet synchronous motor without a position sensor and a verification system thereof. Background technique [0002] The application of permanent magnet synchronous motor (PMSM) with delta connection has certain historical reasons. In the period without frequency converter, in order to reduce the inrush current when the motor starts, the connection method of the motor can be changed through the contact switch. It is star-shaped, and then connected into a delta after starting. This is the common star-delta start in industrial control. With the frequency converter, especially after the emergence of vector control, the problem of excessive starting current is easily solved. For convenience, many motors are directly designed into a star connecti...

AI Technical Summary

Problems solved by technology

Due to its structure, the delta connection motor will form a circulating current inside it during operation, which will theoretically cause the motor to heat up and reduce its efficiency

There are very few studies on the driving algorithm related to the control of delta-connected motors, and the existing related research is also aimed at the performance comparison of different connection methods.

Images