发明名称 |
Linear vibration motor and method for controlling vibration thereof |
摘要 |
A linear vibration motor which includes a vibration system, an electromagnetic driver, a detection system, and a control system. The vibration system includes a driven member or reciprocator which is mounted to a magnetic member for reciprocating movement. The amplitude of the reciprocating movement varies as an inverse function of load on the motor. The electromagnetic driver includes a coil and drives the vibration system by applying an electromagnetic force to the magnetic member, the electromagnetic force being produced by a driving current flowing through the coil. The detection system detects at least one characteristic of the vibration system that is related to a characteristic frequency of the vibration system, and produces a feedback signal indicative of a value of the at least one characteristic. The control system is responsive to the feedback signal, during a primary mode of operation, to controllably vary the driving current flowing through the coil in such a manner as to drive the vibration system in resonance with the characteristic frequency, and determines the existence of a condition that renders the detection system non-functional, and drives the vibration system at a prescribed frequency when it is determined that the condition exists, during a back-up mode of operation. <IMAGE> |
申请公布号 |
EP0860933(B1) |
申请公布日期 |
2004.12.29 |
申请号 |
EP19980103302 |
申请日期 |
1998.02.25 |
申请人 |
MATSUSHITA ELECTRIC WORKS, LTD. |
发明人 |
AMAYA, HIDETOSHI;MAEKAWA, TAKIO;OKAMOTO, TOYOKATSU;IBUKI, YASUO |
分类号 |
H02K33/04;B26B19/28;H02K33/16;H02K33/18;H02P25/02 |
主分类号 |
H02K33/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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