Drive control apparatus for brushless motor

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

1998-02-05

1999-08-10

Ro, Bentsu

Electricity: motive power systems

Constant motor current, load and/or torque control

318254, 318459, H02P 608

Patent

active

059363649

ABSTRACT:
A pulse width of a drive pulse of a brushless motor is modulated in correspondence to a setting signal for setting the rotation rate. Switching control for the current supplied to exciting coils is implemented by using an output signal from Hall elements for detecting the position of the rotor and the drive pulse. Correction of the pulse width of the drive pulse is implemented to ensure that the average voltage is maintained at a constant level even when the source voltage fluctuates so that stable rotation can be maintained over the entire rotation rate range even when the source voltage supplied to the brushless motor fluctuates and so that the fuse can be prevented from melting and the motor can be prevented from becoming damaged, which may otherwise be caused by a fluctuating source voltage.

REFERENCES:
patent: 5287044 (1994-02-01), Izawa et al.
patent: 5519301 (1996-05-01), Yoshida et al.
patent: 5537020 (1996-07-01), Couture et al.

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