Stepper motor control to vary output torque

Details Stepper motor control to vary output torque Stepper motor control to vary output torque

1989-08-14

1992-04-21

Shoop, Jr., William M.

Electricity: motive power systems

Open-loop stepping motor control systems

318685, H02P 800

Patent

active

051071940

ABSTRACT:
A mechanical drive system with different load requirements is enabled by a motor whose input is varied in response to known changes in output torque requirements during various time segments of the duty cycle. In one example a fuser roll in a copier is driven by a DC stepper motor during a period in which a copy sheet is in the fusing area at a first speed V.sub.1. Upon completion of the fusing portion of the cycle, the fuser load requirements increase requiring a higher torque to be delivered by the motor. The change in fuser operation is determined by timing and an appropriate signal is sent to the control circuit reducing the motor speed, and allowing the motor to produce the additional torque required.

REFERENCES:
patent: 3855515 (1974-12-01), Hutchins, Jr.
patent: 3909125 (1975-09-01), Reehil et al.
patent: 3921043 (1975-11-01), Luzio
patent: 4340848 (1982-07-01), Hanagata et al.
patent: 4496891 (1985-01-01), Kobayashi
patent: 4822978 (1989-04-01), Morris et al.

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