Control device for brushless DC motor

Details Control device for brushless DC motor Control device for brushless DC motor

1998-12-04

2000-03-07

Ro, Bentsu

Electricity: motive power systems

Switched reluctance motor commutation control

318431, 318437, H02P 618

Patent

active

060344946

ABSTRACT:
A control device controls operation of a brushless DC motor in such a way that the motor is started and accelerated up to a predetermined rotational speed by applying driving voltage formulated based on a synchronous signal under a startup-drive-mode and the driving mode is switched, after the predetermined rotational speed is established, to a self-controlled-drive-mode in which the driving voltage is formulated based on signals indicating an angular position of the rotor relative to the armature. In the transient period for switching-over from the start-up-drive to the self-controlled-drive, phase difference between the driving voltage and the rotor position signal is detected for a period covering more than one rotation of the rotor, the switching-over is carried out only when the phase difference is sufficiently small to avoid a motor stall or an excessive shock. Preferably, a pulse-width-modulated voltage is used as the driving voltage, so that the phase difference can be controlled by changing a duty ratio of the driving voltage.

REFERENCES:
patent: 5378976 (1995-01-01), Inaji et al.
patent: 5783917 (1998-07-01), Takekawa
patent: 5814957 (1998-09-01), Yoshida

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