Hall line sequence adaptive learning method of brushless motor

Abstract

The invention discloses a Hall line sequence adaptive learning method of a brushless motor. The method comprises the steps of targeting to a first sector, opening a C-phase upper bridge arm, an A-phase lower bridge arm and a B-phase lower bridge arm; enabling the current to flow in from the C phase and flow out from the phase A and the phase B; enabling the rotor of the motor to stop at a positionafter being dragged by a magnetic field, storing the Hall signal of the position , and establishing a mapping relation : when the Hall signal appears, if the motor needs to be controlled to rotate forwards, controlling the current direction of the coil to be A phase to B phase, and if the motor needs to be controlled to rotate reversely, controlling the current direction of the coil to be B phaseto A phase; and sequentially processing the second sector, the third sector, the fourth sector, the fifth sector and the sixth sector in the same way. According to the invention, by establishing themapping relation between the Hall signal and the brushless motor energized coil, the motor power line and the Hall signal line can be connected according to any sequence; the installation type of theHall sensor can be recognized, and various Hall sensor installation modes can be supported.

Description

Technical field [0001] The invention relates to a motor drive system, in particular to a Hall line sequence adaptive learning method of a brushless motor. Background technique [0002] In the prior art, a Hall sensor brushless motor uses a Hall sensor to know the position of the permanent magnet of the rotor, and switches the energization phase of the stator coil according to the Hall signal. Compared with the Hallless brushless motor, it is more stable when starting at low speed, and the maximum torque can be output when starting at zero speed. Therefore, the Hall brushless motor is widely used in occasions where large torque is required for frequent start and stop. The driver needs to determine the coil that the motor is energized according to the Hall signal, so the mapping relationship between the Hall signal data and the motor energization coil must be determined. In actual applications, the power line ABC from the driver to the motor and the Hall signal HA, HB, HC must be c...

AI Technical Summary

Problems solved by technology

This method is suitable for Hall installed with an advanced timing angle of 30 degrees. If this method is used on a more widely used motor with a Hall installed at a timing angle of 0 degrees, the identification may fail due to repeated jumps of the Hall signal.

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