Vehicular motor driving apparatus

Details Vehicular motor driving apparatus Vehicular motor driving apparatus

1998-07-28

1999-07-27

Masih, Karen

Electricity: motive power systems

Positional servo systems

Pulse-width modulated power input to motor

363 8, 363127, 318581, 318807, 318811, 388814, G05B 1128

Patent

active

059295864

ABSTRACT:
A vehicular motor driving apparatus includes a control unit 15 for drive-controlling a motor by PWM-drive-controlling a motor driving circuit based on a motor starting signal. The control unit has a drive controller for setting a drive frequency of a PWM-drive control signal to be an integral multiple of or (integer+0.5) times a channel frequency interval of channel frequencies allotted for AM radio broadcasts. As a result, radiation noise associated with harmonics of the PWM-drive control signal, when coincided with the channel frequencies used by AM radio broadcast stations, is removed along with the channel frequencies through radio receiver detection. When the radiation noise does not coincide with the in-use channel frequencies, it is offset by the channel frequency interval therefrom, thereby preventing its reception.

REFERENCES:
patent: 5321596 (1994-06-01), Hurst
patent: 5501201 (1996-03-01), Miyoshi et al.

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