Variable-reluctance stimulation and decoding module for measuring position angle of rotor of permanent magnet synchronous motor

Abstract

The embodiment of the invention designs a variable-reluctance stimulation and decoding module for measuring position angle of a rotor of a permanent magnet synchronous motor. The variable-reluctance stimulation and decoding module comprises a signal stimulation circuit, a signal decoding circuit, wherein the signal stimulation circuit is used for converting a digital square signal of a signal processor into a sine wave stimulation signal for driving a rotating transformer and comprises a multi-stage filtering amplification circuit for generating a sine wave signal, a push-pull circuit connected with the output end of the multi-stage filtering amplification circuit, and a stimulation winding for improving the driving capability of the signal so as to drive the rotating transformer; the signal decoding circuit is used for decoding the output signal of the rotating transformer and comprises a differential amplification circuit, a rectification turning circuit and a filtering circuit; the differential amplification circuit is used for receiving a differential signal output by the rotary transformer and outputting an amplified echo signal; the rectification turning circuit is used for extracting an envelope line of an echo signal; the filtering circuit is used for filtering the turned echo signal into a flat level signal. According to the embodiment, the cost is effectively reduced, and the function of a decoding chip can be achieved by using only resistance-capacitance devices and operational amplifiers.

Description

technical field [0001] Embodiments of the present invention relate to the field of motor control, and more specifically, the present invention provides a circuit module for measuring the rotor position angle of a permanent magnet synchronous motor. Background technique [0002] For permanent magnet synchronous motors embedded with a resolver, the detection of the rotor position is determined by collecting the signal output from the resolver. The resolver has the advantages of high temperature resistance, humidity resistance, impact resistance, anti-interference and high precision. Widely used in automotive control systems. The resolver is an analog device that outputs an AC modulation signal. In a digital control system, it is often necessary to convert the output signal of the resolver into a digital angle signal. Common resolver angle decoding methods include the method of decoding with a hardware decoding chip and the method of decoding with software based on DSP. [00...

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a circuit module for measuring the rotor position angle of a permanent magnet synchronous motor. Position angle signal, so as to solve the problem that cannot be used in large quantities due to the high price of the hardware decoding chip

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