Electricity: motive power systems – Impact – mechanical shock – or vibration-producing motors
Reexamination Certificate
2006-12-12
2006-12-12
Duda, Rina (Department: 2837)
Electricity: motive power systems
Impact, mechanical shock, or vibration-producing motors
C318S632000, C318S611000
Reexamination Certificate
active
07148636
ABSTRACT:
A motor drive control apparatus for driving and controlling a linear vibration motor having a mover supported by a spring, with an AC current. The motor drive control apparatus includes a waveform creation unit for creating a comparative current waveform to be a reference of a driving current for the linear vibration motor based on the operating condition of the linear vibration motor, a current detector for detecting the driving current, and a controller for controlling a driving voltage of the linear vibration motor so that a difference between the comparative current waveform and a waveform of the current detected by the current detector becomes zero. The frequency of the driving current is controlled to be close to the resonance frequency of the linear vibration motor, based on the comparative current waveform. Accordingly, the driving frequency of the linear vibration motor can always be brought to the resonance frequency without using a sensor for detecting a displacement, speed, or acceleration of the mover, for example.
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Nakata Hideki
Ueda Mitsuo
Yoshida Makoto
Duda Rina
Matsushita Electric - Industrial Co., Ltd.
Wenderoth , Lind & Ponack, L.L.P.
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