Linear vibration motor and method for controlling vibration ther

Details Linear vibration motor and method for controlling vibration ther Linear vibration motor and method for controlling vibration ther

1998-02-25

1999-09-21

Ramirez, Nestor

Electrical generator or motor structure

Dynamoelectric

Oscillating

15 222, 388937, 388902, 318119, 310 50, H02K 3302

Patent

active

059557990

ABSTRACT:
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.

REFERENCES:
patent: 4583027 (1986-04-01), Parker et al.
patent: 5613259 (1997-03-01), Craft et al.
patent: 5632087 (1997-05-01), Motohashi et al.
patent: 5736797 (1998-04-01), Motohashi et al.

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