Electricity: motive power systems – Impact – mechanical shock – or vibration-producing motors
Reexamination Certificate
2006-12-19
2006-12-19
Duda, Rina (Department: 2837)
Electricity: motive power systems
Impact, mechanical shock, or vibration-producing motors
C318S119000, C310S012060
Reexamination Certificate
active
07151348
ABSTRACT:
A motor driving apparatus for driving a linear vibration motor having a spring member that supports a mover so as to form a spring vibration system including the mover. The motor driving apparatus employs an accurate spring constant of the spring member corresponding to an individual linear vibration motor at a position calculation for obtaining the position of the mover during the operation, thereby increasing the accuracy of the position calculation. The motor driving apparatus includes a mover force vibration unit for making the mover of the linear vibration motor freely vibrate, a relative position detection unit for detecting a timing when the freely vibrating mover passes through a fixed point (relative position), and a natural frequency detection unit for detecting a natural frequency of the mover based on output information from the relative position detection unit, thereby calculating the spring constant based on the detected natural frequency.
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Nakata Hideki
Ueda Mitsuo
Yoshida Makoto
Duda Rina
Matsushita Electric Industrila Co., Ltd.
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