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US 6,801,007 B2Granted
Electrically-operated actuator system
AssigneeDenso Corporation
InventorsTokuhisa Takeuchi, Takashi Takata
Life of this patent
Estimating the term…
Abstract
A motor stopping circuit is activated when a motor control circuit is stopped by a reset signal outputted from a reset circuit. This maintains an overrun angle small. As a result, a difference between a rotation angles measured when the motor control circuit is turned off and measured when the motor control circuit is turned on are small. Therefore, frequent origin setting operation is not required. This reduces sizes and manufacturing costs of a stopper and an actuator.
Claims5
An electric actuator system comprising:
- an electric motor having an output shaft;
- a rotation angle determination means that detects a rotation angle of the output shaft based on a pulse signal produced by a pulse generator according to a rotation angle of the electric motor;
- a motor control means that controls an operation of the electric motor based on the rotation angle determined by the rotation angle determination means;
- a reset means that turns off the motor control means when a voltage applied to the motor control means becomes lower than a predetermined level, and turns on the motor control means when the voltage becomes higher than the predetermined level;
- a motor driving means that supplies driving current to the electric motor based on a control signal from the motor control means;
- a motor stopping means that stops the electric motor via electric braking based on the control signal from the motor control means within a time that pulses counted after the motor control means is turned off is less than a predetermined number;
- and
- a motor stopping means driving means that drives the motor stopping means when the motor control means is turned off by the reset means.
5 more elements
Dependencies are inferred from the claim text.