Permanent magnet synchronous motor rotary transformer and automatic zero setting method thereof

Abstract

The invention provides a permanent magnet synchronous motor rotary transformer and an automatic zero setting method thereof. The permanent magnet synchronous motor rotary transformer comprises a rotary transformer stator, a rotary transformer rotor, a rotating shaft, a rear flange and an automatic zero setting device, wherein the rotary transformer rotor is arranged on the rotating shaft, the rotary transformer stator is installed on the rear flange, a second positioning hole and an installation hole are formed in the automatic zero setting device, and a pin penetrates through the second positioning hole and the first positioning hole to be matched with each other. The automatic zero setting method comprises the following steps of displaying a plurality of periodically changed waveforms through an oscilloscope, and when the two periodically changed waveforms coincide at a preset zero point, controlling the automatic zero setting device of the permanent magnet synchronous motor rotary transformer and the rotating shaft to stop rotating. According to the embodiment of the invention, the zero setting rapidness and automation of the rotary transformer of the permanent magnet synchronous motor can be realized, the consistency of the zero point of the rotary transformer is improved, and the running reliability of the whole vehicle is improved.

Description

technical field [0001] The invention relates to a rotary transformer for a permanent magnet synchronous motor, in particular to a rotary transformer for a permanent magnet synchronous motor and an automatic zeroing method thereof. Background technique [0002] With the continuous development of new energy vehicles, especially pure electric vehicles, permanent magnet synchronous motors are widely used in pure electric vehicles due to their high power density and efficiency, small size, fast response, and flexible control. For motor control, the vector control of permanent magnet synchronous motor requires accurate real-time detection of the absolute position of the rotor. Resolvers are widely used in permanent magnet synchronous motors. At present, most motor manufacturers have certain requirements for the factory precision of the resolvers of permanent magnet synchronous motors, and require products to have high consistency. Therefore, the zero point of the resolver of the m...

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Problems solved by technology

[0004] The embodiment of the present invention provides a permanent magnet synchronous motor rotary transformer and its automatic zeroing method, which is used to solve the problem of poor automatic zeroing consistency of the permanent magnet synchronous motor rotary transformer in the prior art, or the slow production cycle of ordinary manual adjustment

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