Optimal efficiency point tracking device and method for wireless motor system

Abstract

The invention discloses an optimal efficiency point tracking device and method for a wireless motor system, and belongs to the technical field of wireless power transmission. The device comprises a Bluetooth module, an optimal efficiency point control module and a phase shift angle controller. According to the invention, coil parameters are designed, so that the motor under a rated working condition meets an impedance matching condition; and the minimum output voltage of the full-bridge rectifier circuit meeting the operation condition of the motor is calculated, the output voltage of the full-bridge rectifier circuit meeting the impedance matching condition is estimated, and the d-axis current of the motor is controlled according to the magnitude relationship of the two voltages. In consideration of an estimation error, a perturbation and observation method is introduced to obtain a full-bridge rectifier circuit output reference voltage, and a phase shift angle of a transmitting side full-bridge inverter circuit is changed to enable a receiving side full-bridge rectifier circuit output voltage to be the reference voltage, so that impedance matching conditions are met, and the efficiency of two ends of a coupling coil is improved; and the system efficiency of the motor under the non-rated working condition is improved. The system efficiency can be improved while normal operation of the motor is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of wireless power transmission, and more particularly relates to a device and method for tracking the optimal efficiency point of a wireless machine system. Background technique [0002] Due to the increasingly serious problems of fossil energy shortage and ecological environment deterioration, human beings are paying more and more attention to clean energy, electric energy has been widely used as a clean and efficient energy source, and the electric vehicle industry has flourished in recent years. As a future development direction of electric vehicles, wireless motors have received more and more attention because they can bring greater design freedom and more flexible control to electric vehicles. [0003] The motor with constant speed and electromagnetic torque can be regarded as a constant power load, and viewed from the input side of the three-phase inverter, the motor and the inverter as a whole can be ...

AI Technical Summary

Problems solved by technology

However, in actual operation, the operation of the motor cannot always be maintained at the rated working condition, causing the equivalent load of the motor to deviate from the impedance matching condition, which in turn causes the transmission power at both ends of the coil to decrease

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