Motor drive system for a polygon scanner

Details Motor drive system for a polygon scanner Motor drive system for a polygon scanner

1992-10-05

1993-08-31

Shoop, Jr., William M.

Electricity: motive power systems

Synchronous motor systems

Hysteresis or reluctance motor systems

318721, 358296, G06F 506

Patent

active

052412520

ABSTRACT:
A scanning polygon in a ROS system in driven by a motor whose speed is varied in response to desired changes in the resolution of the scan line being formed at a photosensitive surface. The motor of choice is a 2-phase AC hysteresis synchronous motor which is run by square wave input signals to each winding which 90.degree. out of phase. The motor input signals are at a power level which is variable in response to changes in the frequency of the square wave inputs. The power level variations are applied at the wave front transition so as to prevent the motor from jumping out of synchronism at these points, thus enabling smooth motor operation.

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