摘要 |
A method and apparatus for accurately controlling a hysteresis synchronous motor velocity eliminate low frequency hunting, which is characteristic of the motor. A nominal input phase current is modified by providing feedback information, thereby enabling a microprocessor control system to modify the phase of quadrature input current signal to the motor and thereby eliminating hunting of the motor. Accordingly, in a high resolution scanning application, speed variations which could cause disturbing artifacts to appear in an output image are eliminated. Velocity control, better than 15 parts per million, can be achieved |
申请人 |
ECRM INC., TEWKSBURY, MASS., US |
发明人 |
BOSTON, W., THOMAS, NORTH ANDOVER, MA 01845, US;CARL, JAMES, A., LITTLETON, MA 01460, US;CONNOLLY, JOHN, L., III, NEWTON, NH 03858, US |