Apparatus for preventing generation of noise of a blower unit us

Details Apparatus for preventing generation of noise of a blower unit us Apparatus for preventing generation of noise of a blower unit us

1991-08-09

1992-07-14

Ro, Bentsu

Electricity: motive power systems

Switched reluctance motor commutation control

318138, 318460, G05B 501, H02P 602

Patent

active

051306212

ABSTRACT:
A noise prevention apparatus for a blower unit using a brushless motor is disclosed in which, when a setting speed of rotation set by a rotational speed setting unit is judged as being equal to a speed of rotation corresponding to a natural frequency of the blower unit, a drive pulse which is to be provided to a switching unit for controlling the rotation of the blower is corrected by a drive pulse correction unit such that the setting speed of rotation is deviate from the speed of rotation corresponding to the natural frequency of the blower unit. With this arrangement, the brushless motor is driven at speeds other than the speed corresponding to the natural frequency of the blower. Consequently, a higher harmonic of the vibration of the motor is always kept out of coincidence with the natural frequency of the blower unit, so that a operation noise caused by resonance does not take place any more.

REFERENCES:
patent: 4353016 (1982-10-01), Born
patent: 4358722 (1982-11-01), Iwakane et al.
patent: 4980617 (1990-12-01), Tajima et al.

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