Method and system for detecting initial position of rotor of counter-rotating permanent magnet synchronous motor

Abstract

The invention belongs to the field of rotor position angle detection, particularly relates to a method and a system for detecting the initial position of a rotor of a counter-rotating permanent magnet synchronous motor, and aims to solve the problem that the initial position angle of the rotor cannot be measured when a stator winding and the rotor of the counter-rotating permanent magnet synchronous motor rotate. The method comprises the steps that a rotor of a rotary transformer is arranged on a motor rotor and a stator, a stator of the rotary transformer is arranged on a machine shell, and a current rotor absolute position angle theta 2 is obtained; fixing the stator winding, obtaining a current stator winding position angle theta 10, and obtaining a rotor initial position angle theta '0 under the fixed stator winding; rotating the stator winding to obtain the absolute position theta1 of the current stator winding; obtaining a rotor initial position angle theta0 of the motor under the rotating stator winding by combining the variable quantity from theta10 to theta1 and theta0 '; theta0 and theta2 are initial positions of the synchronous motor rotor. According to the invention, the measurement of the initial position angle of the rotor under the condition that the stator winding and the rotor of the counter-rotating permanent magnet synchronous motor both rotate is realized by using the double rotary transformers.

Description

technical field [0001] The invention belongs to the field of rotor position angle detection in the permanent magnet synchronous motor control technology, and in particular relates to a counter-rotating permanent magnet synchronous motor rotor initial position detection method and system. Background technique [0002] The attitude of the underwater vehicle needs to be stable during the navigation process, so most of them use the counter-rotating propeller propulsion system to overcome the gyroscopic effect. The counter-rotating permanent magnet synchronous propulsion motor has two mechanical output ports because there are no brushes, commutators and gears. Direct drive counter-rotating propeller propulsion system, high power, high reliability, small torque ripple, good heat dissipation, small radial and axial tension, no gyro effect and other excellent performances, so it is used in ships, underwater vehicles, etc. It is widely used in the field of electric propulsion. [00...

AI Technical Summary

Problems solved by technology

[0011] In order to solve the above-mentioned problems in the prior art, that is, the problem that the rotor initial position angle cannot be measured when both the stator winding and the rotor of the counter-rotating permanent magnet synchronous motor rotate, the present invention provides a counter-rotating permanent magnet synchronous motor rotor initial position detection method, which includes:

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