Programmable stepper motor controller

Details Programmable stepper motor controller Programmable stepper motor controller

1989-09-29

1991-07-16

Shoop, Jr., William M.

Electricity: motive power systems

Open-loop stepping motor control systems

318685, 318 6, 318603, 377 44, H02P 800

Patent

active

050327801

ABSTRACT:
A motor controller provides a digital monostable circuit which generates a control signal indicating whether a field coil within a motor should be turned on or off. Two registers are provided within the digital monostable to store values indicating a fixed off time and a minimum on time. These registers can be loaded with selected values by a microprocessor or other controller. The stored values are selectively loaded into a counter which, when the field coil current reaches a preselected level, turns the supply to the field coil off for a time corresponding to the off time value, then on again for a period at least as long as the minimum on time value. The values in the off time and minimum on time registers can be changed to suit operating conditions of the system, and the controller can be operated in either PWM or open loop mode.

REFERENCES:
patent: 4065074 (1977-12-01), Anderson et al.
patent: 4330751 (1982-05-01), Swain
patent: 4506201 (1985-03-01), Tsuneki

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