Permanent magnet synchronous motor resolver zero position calibration circuit

Abstract

The invention discloses a permanent magnet synchronous motor resolver zero position calibration circuit comprising three voltage dividing circuits for collecting three-phase output voltages Ua, Ub and Uc of a permanent magnet synchronous motor. The output ends of the three voltage dividing circuits are connected with the in-phase input ends of three comparators U1A, U1B and U5A. The inverting input ends of the three comparators are connected with a bus negative electrode. The comparator output voltages Ua' and Ub' through an exclusive OR gate and the comparator output voltage Uc' are exclusive OR again. The output voltages of the three comparators are connected with the NO pin of an alternative analog switch through a digital isolator after the exclusive OR logic output. The resolver sampling signal and the selection signal sent by the DSP are connected with the NC pin and the IN pin of the alternative analog switch. The COM pin of the alternative analog switch connects the output signal to the SAMPLE pin of a resolver decoding chip. Resolver zero position calibration can be quickly performed, the cost is low, the response is fast and the calibration accuracy is high, and the circuit can be directly transplanted to a PCB for real-time calibration and self-learning for the hybrid vehicle type.

Description

technical field [0001] The invention relates to a permanent magnet motor, in particular to a permanent magnet synchronous motor resolver zero calibration circuit. Background technique [0002] The existing resolver zero position calibration needs to place the motor and electronic control on the test bench, and the experimenter operates the upper computer and the bench, and continuously debugs to obtain the resolver zero position angle. The operation is complicated, time-consuming, and the accuracy is not high enough. High; use the dynamometer to drag the motor to a certain speed to collect the back electromotive force method, although the precision is high, but it relies on the dynamometer and other devices, and it is relatively complicated to implement. [0003] The closest public document to this patent solution is the patent "A Permanent Magnet Synchronous Motor Resolver Zero Position Calibration System and Calibration Method" (publication number: 109239635A), which mainl...

AI Technical Summary

Problems solved by technology

[0004] Compared with the present invention, the existing technical solution is relatively complicated to implement, and the cost is also high. It c

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