Direct current brushless motor and driving method therefor

Details Direct current brushless motor and driving method therefor Direct current brushless motor and driving method therefor

1997-02-13

1998-09-29

Masih, Karen

Electricity: motive power systems

Limitation of motor load, current, torque or force

318254, 318138, 318599, H01R 3946

Patent

active

058149570

ABSTRACT:
A direct current brushless motor has a control unit (8) for controlling a commutation of current flowing in a stator winding (3), a duty ratio of an applied voltage to the stator winding (3), and a carrier period for the duty ratio. The control unit (8) switches over between a first operating mode at a starting operation and a second operating mode at an ordinary operation in accordance with at least one of a rotational speed of the rotor (2) and time length from starting of the first starting mode. The control means (8) adjust the carrier period so that a first setting value to be adjusted in the first operating mode is larger than a second setting value to be adjusted in the second operating mode.

REFERENCES:
patent: 5166586 (1992-11-01), Yaguchi

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