Method, device and motor for determining angular position of permanent magnet synchronous motor rotor

Abstract

The invention provides a method and device for determining the rotor angle position of a permanent magnet synchronous motor and the permanent magnet synchronous motor. The motor is provided with a Hall magnetic ring of which the number of pole pairs is twice that of the pole pairs of the motor, and the method comprises the following steps: acquiring a Hall position signal level when the permanentmagnet synchronous motor is powered on and is in a stop state, and determining an initial Hall angle position and an initial sector value according to the Hall position signal level; adding current inthe q-axis direction of the initial Hall angle position, and judging whether the initial sector value is changed or not; when the change occurs, recording a sector change value, and determining a rotation direction and a Hall position flag bit of the permanent magnet synchronous motor according to the sector change value; when the Hall position does not change, adding a positive voltage pulse anda negative voltage pulse to the initial Hall angle position, and obtaining and comparing a positive current peak value and a negative current peak value to determine a Hall position flag bit; and determining the rotor angle position of the permanent magnet synchronous motor according to the Hall position flag bit and the initial Hall angle position.

Description

technical field [0001] The invention relates to the technical field of permanent magnet synchronous motors, in particular to a method and device for determining the angular position of a permanent magnet synchronous motor rotor and a permanent magnet synchronous motor. Background technique [0002] The closed-loop control of the permanent magnet synchronous motor is based on the fact that a variety of control variables can be measured, such as the feedback variables required by the speed loop and torque loop, including speed, rotation angle and current. Among them, in order to adjust the speed and position of the rotor, it is generally necessary to install a position sensor with high precision (such as a photoelectric encoder and a resolver) on the shaft end of the motor rotor for closed-loop control of the speed and position. The use of the position sensor ensures the control of the motor. However, it also has the disadvantages of increased system cost and reduced system re...

AI Technical Summary

Problems solved by technology

It can be seen that the position resolution of the permanent magnet synchronous motor Hall position acquisition scheme in the related art is 60° electrical angle, which cannot meet the application requirements for high-demand low-speed control occasions

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