A Hall phase sequence identification method for DC brushless motor

Abstract

The invention provides a method for identifying the Hall phase sequence of a DC brushless motor. The identification method comprises the steps of firstly, carrying out pre-positioning on a rotor of the DC brushless motor by the means of sequentially introducing a first pre-positioning voltage vector and a second pre-positioning voltage vector, collecting Hall state signals of three Hall sensors after the pre-positioning, then determining a correct Hall combination mode according to a Hall state combination target value corresponding to the second pre-positioning voltage vector and the Hall state signals of the three Hall sensors to obtain a candidate set, then introducing a third pre-positioning voltage vector into the DC brushless motor, collecting Hall state signals of the three Hall sensors after introducing the third pre-positioning voltage vector, and further selecting a correct Hall combination mode from the candidate set to serve as an identification result according to a Hall state combination target value corresponding to the third pre-positioning voltage vector and the Hall state signals. The automatic identification of the Hall phase sequence of the DC brushless motor isrealized without manual debugging.

Description

technical field [0001] The invention relates to the field of motor control, in particular to a Hall phase sequence identification method for a DC brushless motor. Background technique [0002] When the flow brushless motor is running normally, the rotor position must be known, that is, the power-on sequence of the motor is controlled according to the output state of the Hall element. There are 6 combinations of three-phase Hall element output, so it is necessary for the debugger to judge the correct Hall combination according to the running state of the motor. The more intuitive way is to use an oscilloscope to observe the current waveform to judge, but if the oscilloscope cannot be obtained In some occasions, manual debugging is required. During manual debugging, the debugger needs to have certain professional knowledge to debug smoothly, which is very inconvenient. Therefore, the technical problem to be solved by the present invention is how to provide a method that can ac...

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Problems solved by technology

There are 6 combinations of three-phase Hall element output, so it is necessary for the debugger to judge the correct Hall combination according to the running state of the motor. The more intuitive way is to use an oscilloscope to observe the current waveform to judge, but if the oscilloscope cannot be obtained In some occasions, manual debugging is required. During manual debugging, the debugger needs to have certain professional knowledge to debug smoothly, which is very inconvenient. Therefore, the technical problem to be solved by the present invention is how to provide a method that can accurately identify the brushless The Method of Hall Phase Sequence of DC Motor

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