Control apparatus for vibration driven motor

Details Control apparatus for vibration driven motor Control apparatus for vibration driven motor

1990-06-18

1991-04-02

Shoop, Jr., William M.

Electricity: motive power systems

Reciprocating or oscillating motor

Energizing winding circuit control

310 51, H02N 200

Patent

active

050049640

ABSTRACT:
A unit for attenuating frequency components generated in a sideband of a frequency of an AC voltage applied to an electro-mechanical energy conversion element. This attenuation is achieved by modulation performed in a speed control apparatus for a vibration driven motor. The control apparatus includes a filter for cutting frequency components of a smaller frequency difference (fd) or more of an absolute value of a frequency difference between a natural frequency of an n-th order vibration and a natural frequency of an (n-1)th- or (n+1)th-order. A filter output is input to a modulator in a driving circuit, and noise of the vibration driven motor can be greatly reduced.

REFERENCES:
patent: 4588934 (1986-05-01), Suzuki et al.
patent: 4594636 (1986-06-01), Hamer et al.
patent: 4659969 (1987-04-01), Stupak, Jr.
patent: 4700148 (1987-10-01), Pauly
patent: 4810922 (1989-03-01), Hirsch
patent: 4929874 (1990-05-01), Mizuno et al.
patent: 4935651 (1990-06-01), Hong et al.

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