Rotation control apparatus, electronic timepiece, and rotation control method
AssigneeCasio Computer Co., Ltd.
InventorYuta SAITO
Life of this patent
Estimating the term…
Abstract
A rotation control apparatus for a stepping motor includes a motor control unit including a function of supplying to a coil a first pulse for rotating a rotor, a function of supplying to the coil a second pulse that is shorter than the first pulse and has the opposite polarity from the first pulse, and a function of supplying to the coil a third pulse that is shorter than the first pulse and has the same polarity as the first pulse; and a determination unit that determines whether or not the rotor has been rotated by the first pulse on the basis of a current that flows in the coil in response to the third pulse.
Claims18
A rotation control apparatus for a stepping motor, comprising:
- a motor control unit that causes a first pulse for rotating a rotor of the stepping motor to be supplied to the stepping motor;
- the motor control unit subsequently causing a second pulse that is shorter than the first pulse and that has an opposite polarity from the first pulse to be supplied to the stepping motor so as to stabilize the rotor, and thereafter causing a third pulse that is shorter than the first pulse and that has the same polarity as the first pulse to be supplied to the stepping motor so as to induce a current in the stepping motor for detecting whether or not the rotor has successfully rotated to a target position;
- and
- a determination unit that receives a signal representing the current induced in the stepping motor so as to determine whether or not the rotor has successfully rotated to the target position.
A rotation control apparatus for a stepping motor having a coil to rotate a rotor, comprising:
- a motor control unit causing a first pulse for rotating the rotor of the stepping motor to be supplied to the coil of the stepping motor, the motor control unit subsequently causing a second pulse that has an opposite polarity from the first pulse to be supplied to the coil so as to stop the rotor at a stable position where the rotor is magnetically stable, and thereafter causing a third pulse that is shorter than the first pulse and has the same polarity as the first pulse to be supplied to the coil;
- and
- a determination unit that determines whether or not the rotor has been rotated by the first pulse on the basis of a current that flows in the coil in response to the third pulse supplied.
A rotation control method, used in a stepping motor that includes a rotor having a magnet and a stator having a coil for rotating the rotor, of controlling rotation of the rotor, the method comprising:
- supplying to the coil a first pulse for rotating the rotor;
- thereafter, supplying to the coil a second pulse that is shorter than the first pulse and that has an opposite polarity from the first pulse;
- thereafter, supplying to the coil a third pulse that is shorter than the first pulse and has the same polarity as the first pulse;
- and
- determining whether or not the rotor has been rotated by the first pulse to a target position on the basis of a current that flows in the coil in response to the third pulse.
Dependencies are inferred from the claim text.