Fault-tolerant control method and system for single-phase Hall faults of brushless direct-current motor

Abstract

The invention discloses a fault-tolerant control method and system for the single-phase Hall faults of a brushless direct-current motor. The method comprises the following steps that: a plurality of pieces of switching quantity information of three Hall sensors in a preset time range are obtained, the plurality of pieces of switching quantity information are coded, so that a plurality of switchingquantity information codes are formed; the plurality of switching quantity information codes are converted into a switching state sorting table; the fault switching quantity information of the Hall sensors in the switching state sorting table is obtained by comparing information in the switching state sorting table with information in a correct six-step state sorting table; normal switching quantity information corresponding to the fault switching quantity information is constructed, and wrong switching quantity information in the switching state sorting table is replaced with the normal switching value information, so that a new switching state sorting table can be formed; and the brushless direct-current motor is controlled to operate according to the new switching state sorting table.With the method adopted, the single-phase Hall faults can be rapidly and simply analyzed, and fault-tolerant control can be effectively implemented.

Description

technical field [0001] The invention relates to the technical field of brushless DC motors, in particular to a fault-tolerant control method and system for single-phase Hall faults of brushless DC motors under 120° distribution of Hall sensors. Background technique [0002] The brushless DC motor is an AC motor with a permanent magnet rotor, which has the advantages of small size, high efficiency, simple structure, easy control, and excellent performance. [0003] In order to achieve reliable commutation and control of brushless DC motors, it is usually necessary to install switch-type Hall position sensors. However, under harsh application conditions of strong vibration and strong corrosion, the reliability of Hall sensors will be greatly affected. Especially with the long-term operation of the brushless DC motor, the Hall sensor will inevitably fail, and the short-circuit fault or open-circuit fault of the single-phase Hall sensor is the most common. Once the Hall sensor ...

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a fault-tolerant control method and device for a single-phase Hall fault of a brushless DC motor, so as to solve the cumbersome and complicated problem of the Hall fault detection method of a brushless DC motor in the prior art

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