Method of controlling positioning of rotor of stepping motor
First Claim
1. A method of controlling the positioning of a rotor of a stepping motor having phase windings comprising the steps of:
- (1) energizing the windings within the last step in a movement of the rotor to a desired rest position thereof so as to produce a first magnetic vector, a position indicated by said first magnetic vector being displaced from said desired rest position of the rotor in the direction of said movement thereof by a predetermined amount so that the rotor is caused to overshoot said desired rest position of the rotor by such an amount that a positioning error of the rotor due to a hysteresis characteristic thereof in the direction of said movement is compensated; and
(2) subsequently energizing the windings so as to produce a second magnetic vector, a position indicated by said second magnetic vector coinciding with said desired rest position of the rotor.
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Accused Products
Abstract
A method of controlling the positioning of a rotor of a stepping motor is disclosed. During the last step in a movement of the rotor to a desired rest position thereof, the windings of the stepping motor are energized so as to produce a first magnetic vector, a position indicated by the first magnetic vector being displaced from the desired rest position in the direction of the movement of the rotor by a predetermined amount. This displacement of the first magnetic vector causes the rotor to overshoot the desired rest position by such an amount that a positioning error of the rotor due to a hysteresis characteristic of the rotor in the direction of the movement thereof is compensated. The windings are then energized to produce a second magnetic vector with the position indicated by this second magnetic vector coinciding with the desired rest position of the rotor. The energization of the windings may be performed in small steps to effect a vernier driving of the rotor.
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Citations
4 Claims
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1. A method of controlling the positioning of a rotor of a stepping motor having phase windings comprising the steps of:
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(1) energizing the windings within the last step in a movement of the rotor to a desired rest position thereof so as to produce a first magnetic vector, a position indicated by said first magnetic vector being displaced from said desired rest position of the rotor in the direction of said movement thereof by a predetermined amount so that the rotor is caused to overshoot said desired rest position of the rotor by such an amount that a positioning error of the rotor due to a hysteresis characteristic thereof in the direction of said movement is compensated; and (2) subsequently energizing the windings so as to produce a second magnetic vector, a position indicated by said second magnetic vector coinciding with said desired rest position of the rotor. - View Dependent Claims (2, 3, 4)
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Specification