Sensorless control method for triangle connection permanent magnet synchronous motor and verification system thereof

Abstract

The invention relates to a sensorless control method for a triangle connection permanent magnet synchronous motor. The sensorless control method comprises the following steps: performing pulse width modulation output of the triangle connection permanent magnet synchronous motor; performing coordinate transformation of sensorless control of the triangular connection permanent magnet synchronous motor; and performing second-order improved coupled sliding mode position estimation. The invention also relates to a verification system of the sensorless control function for the triangular connectionpermanent magnet synchronous motor. With application of the sensorless control method for the triangle connection permanent magnet synchronous motor and the verification system thereof, smooth on-loadswitching between the start-up strategy and the sliding mode estimation speed closed-loop strategy can be realized, and the sharp acceleration and deceleration step with the on-load speed step of 1000r / min (the rated speed of the triangular connection sensorless permanent magnet synchronous motor used in the experiment is 1500r / min, which is a low-speed motor of the air pump used in the vehicle)can be realized, and thus the dynamic response capability and the steady-state anti-load-interference capability are good.

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