Automotive brush-less motor and control method thereof

Abstract

The invention provides an automotive brush-less motor and a control method thereof. The control method of the automotive brush-less motor comprises the following steps of S1, energizing an A-phase coil and a B-phase coil of the brush-less motor; S2, continuously monitoring an induced electromotive force of a C-phase coil; and S3, when the induced electromotive force of the C-phase coil is lower than the voltage of the center point of a star connection relation, carrying out commutation on the brush-less motor after the same time period, wherein the time period is the time from coil energization to a situation that the induced electromotive force of the C-phase coil islower than the voltage of the center point. The automotive brush-less motor and the control method thereof eliminate rotarytransformers or similar Hall sensor components in a conventional brush-less motor, control the start-up and speed regulation of the brush-less motor by monitoring the induced electromotive force of athird phase, and have the advantages of saving cost and installation man-hour, reducing fault sources and saving arrangement space of a whole automobile.

Description

technical field [0001] The invention relates to the technical field of brushless motors for vehicles, in particular to a commutation control method suitable for brushless motors adopting star-shaped connection of stator windings and a corresponding brushless motor for vehicles. Background technique [0002] At present, all brushless motors used in new energy vehicles use resolvers (electromagnetic sensors) to determine the position of the motor rotor relative to the motor stator to commutate the motor windings, which has the advantage of simple control. However, the above commutation control method has the following disadvantages: [0003] (1) The resolver is expensive to purchase and has a heavy weight. It is not cost-effective under the current situation that the national new energy policy subsidy is declining and the subsidy is linked to the mileage. [0004] (2) The resolver adds a potential failure factor to the motor, and if the resolver fails, the motor cannot work. ...

AI Technical Summary

Problems solved by technology

[0003] (1) The purchase price of the resolver is expensive, and its weight is relatively large. It is not cost-effective under the current situation that the national new energy policy subsidy is declining and the subsidy is linked to the mileage

[0004] (2) The resolver adds a potential failure factor to the motor. If the resolver fails, the motor will not work

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