Drive control apparatus for brushless motor

Details Drive control apparatus for brushless motor Drive control apparatus for brushless motor

1998-02-03

1999-05-25

Ro, Bentsu

Electricity: motive power systems

Limitation of motor load, current, torque or force

318254, 318461, H02P 610

Patent

active

059072261

ABSTRACT:
An object of preventing a reduction in the output efficiency of a motor in the high speed rotation range and reducing the noise of the motor in the low speed rotation range is to be achieved. Since, if a signal that corresponds to the rotation rate has a value equal to or smaller than a specific value, the timing with which a switch performs switching is retarded relative to the timing used when the signal corresponding to the rotation rate has a value larger than the specific value, once the operation shifts to the low speed rotation range, the switching timing is retarded to shift from the setting that gives priority to efficiency, to the setting for achieving noise reduction as long as the switching timing is set in advance so that an optimal output efficiency is achieved in the high speed rotation range.

REFERENCES:
patent: 3863118 (1975-01-01), Lander et al.
patent: 4720663 (1988-01-01), Welch et al.
patent: 4874993 (1989-10-01), Tanaka et al.
patent: 5019756 (1991-05-01), Schwarz
patent: 5206567 (1993-04-01), Sakurai et al.
patent: 5233275 (1993-08-01), Danino
patent: 5319289 (1994-06-01), Austin et al.
patent: 5717301 (1998-02-01), Griebhammer et al.

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