Control system for a linear vibration motor
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsMitsuo Ueda, Hideki Nakata, Makoto Yoshida
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Abstract
A motor driving apparatus for driving a linear vibration motor is provided with an order output determining unit for determining a motor output required of the linear vibration motor, and a driving frequency determining unit for determining a driving frequency of the linear vibration motor on the basis of the determined motor output, and an amplitude-fixed AC voltage having a frequency equal to the determined driving frequency is applied to the linear vibration motor, whereby the output of the linear vibration motor can be controlled without changing the amplitude value of the driving voltage applied to the linear vibration motor.
Claims16
A motor driving apparatus for driving a linear vibration motor having a mover which is reciprocatably provided, and a spring member which supports the mover, including:
- a motor driver for supplying an AC voltage as a driving voltage to the linear vibration motor;
- and
- said motor driver controlling at least one of a motor output of the linear vibration motor and a stroke of the mover by adjusting a frequency of the AC voltage.
A motor driving apparatus as defined in any of claims 4 to 7, wherein said reference position is determined on the basis of an elastic limit value of the spring member supporting the mover.
Dependencies are inferred from the claim text.