Rotary transformer decoding circuit and control method thereof

Abstract

The invention discloses a rotary transformer decoding circuit. A rotary transformer decoding chip outputs a preset excitation signal, and inputs the preset excitation signal to the input end of an excitation signal push-pull amplifier circuit connected with the rotary transformer decoding chip. The excitation signal push-pull amplifier circuit receives the preset excitation signal and amplifies the preset excitation signal. The excitation signal push-pull amplifier circuit outputs an excitation signal needed for a rotary transformer according to the resistance of a digital potentiometer. A digital signal processor control circuit is connected with the rotary transformer decoding chip, receives a feedback signal of the rotary transformer decoding chip, and adjusts the resistance of the digital potentiometer connected with the digital signal processor control circuit, thus realizing adaptive matching for different rotary transformers. The invention further discloses a control method of the rotary transformer decoding circuit.

Description

technical field [0001] The invention relates to the technical field of rotary transformers, in particular to a rotary transformer decoding circuit and a control method thereof. Background technique [0002] A resolver is an electromagnetic sensor, also known as a synchronous resolver. It is a small AC motor for measuring angles, used to measure the angular displacement and angular velocity of the rotating object, and consists of a stator and a rotor. Among them, the stator winding is used as the primary side of the transformer to receive the excitation voltage. The rotor winding is used as the secondary side of the transformer, and the induced voltage is obtained through electromagnetic coupling. Resolver, referred to as resolver, is a signal component whose output voltage changes with the rotor angle. [0003] The resolver is installed on the motor, and the resolver decoding circuit is used to analyze the motor speed and angle signals fed back by the resolver. At presen...

AI Technical Summary

Problems solved by technology

At present, the resolver decoding circuit can only match the circuit for a specific resolver. Since the range of the excitation signal of the resolver and the feedback sine and cosine signals are fixed, it is necessary to recalculate the resolution of the resolver circuit for different resolvers. parameters, change the PCB for circuit matching

At present, there are various resolvers for motors in the field of electric vehicles and industrial control. In order to match the resolver, the control board of the motor controller needs to be repeatedly designed or processed, which increases the cost of R&D and production processing.

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