Permanent magnet synchronous motor rotary transformer initial zero measurement method and system

Abstract

The invention discloses a permanent magnet synchronous motor rotary transformer initial zero measurement method and system. The method of the invnetion comprises: calculating an angle theta<dq> when acurrent vector I<s> is unknown relative to a phase angle theta<dq> of a dq axis of an actual quadrature-direct axis coordinate system of a motor rotor; when the phase angle theta<dq> of the current vector Is relative to the actual quadrature-direct axis coordinate system dq axis of the motor rotor is known, dragging the measured motor in a three-phase short-circuit state to a given rotating speedn<ref>; calculating a phase angle theta<DQ> of the current vector I<s> in a DQ coordinate system established by the reading of the rotary transformer in a stable state; and calculating an initial zero angle theta<0> of the motor rotary transformer according to the obtained angle theta<DQ> and the known angle theta<dq>. The method, provided in the invention, for simply, conveniently and accuratelymeasuring the initial zero position of the permanent magnet synchronous motor rotary transformer solves the problems that an existing method is not high in measuring precision, complex in measuring equipment and process and the like, and the initial zero position angle of the motor rotary transformer is difficult to simply, conveniently and accurately detect.

Description

technical field [0001] The invention relates to the technical field of permanent magnet synchronous motor control, in particular to a method and system for measuring the initial zero position of a rotary transformer of a permanent magnet synchronous motor. Background technique [0002] Permanent magnet synchronous motor control usually needs to obtain the real-time position signal of the motor rotor. Due to its high precision, good reliability, and adaptability to harsh environments, resolvers are widely used in occasions such as electric vehicle permanent magnet motors. The resolver is coaxially connected with the motor rotor, and the relative position between the resolver and the motor rotor is random in the initial assembly, resulting in the initial zero position of the resolver (attached figure 1 D-axis direction) and the actual rotor pole direction (attached figure 1 In the d-axis direction) there is a deviation angle θ 0 . In order to ensure the normal operation an...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method and system for measuring the initial zero position of a rotary transformer of a permanent magnet synchronous motor, aiming at solving the problem that the initial zero position angle of the rotary transformer of a permanent magnet synchronous motor is difficult to be accurately detected simply and conveniently

Images