Method of driving fan motor

Details Method of driving fan motor Method of driving fan motor

2007-02-01

2008-11-25

Duda, Rina I (Department: 2837)

Electricity: motive power systems

Positional servo systems

Pulse-width modulated power input to motor

C318S811000, C388S800000, C388S819000

Reexamination Certificate

active

07456597

ABSTRACT:
A fan motor is driven under a pulse width modulation (PWM) control. PWM signals to be supplied to a circuit for driving the fan motor are formed from carrier waves having a specified frequency and a duty ratio of the PWM control. Rotational speed of the fan motor is increased by increasing the duty ratio. In a low speed region, the fan motor is driven with a high carrier frequency to suppress driving noises of the fan motor, while it is driven with a low carrier frequency in a high speed region to reduce switching losses in semiconductor elements. The carrier frequency may be continuously decreased when the fan motor speed reaches the high speed region, or it may be stepwise decreased. The low carrier frequency used in the high speed region is set to such a frequency that guarantees a sufficient number of switching times at a maximum speed of the fan motor.

REFERENCES:
patent: 5300866 (1994-04-01), Yasohara et al.
patent: 6850031 (2005-02-01), Nakata et al.
patent: 6873125 (2005-03-01), Seima et al.
patent: 2004/0189221 (2004-09-01), Kurosawa et al.
patent: A-2002-142494 (2002-05-01), None
patent: A-2003-154952 (2003-05-01), None
patent: A-2004-268789 (2004-09-01), None

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