Brushless motor open-phase detection device and method

Abstract

The invention discloses a brushless motor open-phase detection device and a brushless motor open-phase detection method, which belong to the technical field of motor control. The brushless motor open-phase detection device comprises a position detection unit, a control and driving unit and a determining unit, wherein the position detection unit is used for detecting a position of a motor rotor; the control and driving unit is used for applying a driving voltage to a one-phase coil or multiphase coils of a motor according to the position of the motor rotor; and the determining unit determines whether the one-phase coil or the multiphase coils of the motor has / have an open phase according to positions of the motor rotor before and after the application of the driving voltage. The brushless motor open-phase detection method comprises the steps of: acquiring the position of the motor rotor for the first time; applying the driving voltage according to the position of the motor rotor; acquiring position of the motor rotor for the second time; and determining whether the one-phase coil or the multiphase coils of the motor has / have an open phase according to the position of the motor rotor acquired for the second time and an expected position of the motor rotor. Through the open-phase detection, the brushless motor open-phase detection device and the brushless motor open-phase detection method can reduce motor loss in the early stage, can improve reliability and safety of the motor in the using process, and prevents equipment or human life safety risk caused by problems occurred in motor operation.

Description

technical field [0001] The invention relates to a brushless motor phase loss detection device and method, belonging to the technical field of motor control. Background technique [0002] The brushless motor uses an electronic commutation device to alternately apply a driving voltage to the coils of each phase of the motor, so as to realize the formation of a rotating magnetic field inside the motor, and then push the motor rotor to rotate. Brushless motors can be single-phase, two-phase, three-phase or multi-phase, but regardless of the number, once a phase loss occurs, the operation of the motor will be greatly affected. This effect can be failure to start, or large fluctuations in speed or severe vibration during operation. In any case, the lack of phase will endanger the safety of terminal equipment and even human life. Early and timely determination of motor phase loss can avoid losses during motor production and various dangerous situations during motor operation. ...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, provide a brushless motor phase loss detection device and method, and solve the problem that the existing motor phase loss detection process has high requirements for detection circuits and calculation units, and the process is cumbersome and unnecessary. Convenience for practical use

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