Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1995-03-02
1997-05-20
Dougherty, Thomas M.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
H02N 200
Patent
active
056315163
ABSTRACT:
This invention relates to a vibration type actuator device, which obtains a driving force by applying alternating signals to an electro-mechanical energy conversion element.
In particular, this invention relates to an actuator device system, which forms position information of a movable member by counting pulses from an encoder using a counter upon execution of moving amount control of the movable member using the actuator device, and performs driving control of the actuator device on the basis of this count value.
In this system, a memory for storing the count value of the counter obtained when the actuator device is stopped is provided, and when the actuator device is restarted, the count value stored in the memory is transferred to the counter. When the actuator device is stopped, even if power supply to a control circuit portion such as the counter is stopped as well, precise control based on the count value of the counter can be performed upon restarting of the actuator device.
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Canon Kabushiki Kaisha
Dougherty Thomas M.
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