Electricity: motive power systems – Open-loop stepping motor control systems
Patent
1990-06-06
1992-05-26
Shoop, Jr., William M.
Electricity: motive power systems
Open-loop stepping motor control systems
318685, 318561, 318567, H02P 800
Patent
active
051171716
ABSTRACT:
A stepping motor having independently energizable windings for respectively producing magnetic fields at right angles to each other and directed at the axis of a rotor having a fixed polarity perpendicular to its axis, is operated so that the advance from one step to the next is produced by energizing one winding with a voltage producing a current continuously in one direction, while the voltage applied to the other winding is a rectangularly alternating voltage of a constant period and a gradually changing keying ratio. The roles of the two windings are interchanged between successive steps. A microcomputer for control of the motor has a pulse timing table and a program memory. Two control code memories are provided, one for specifying the direction of current in each of the windings during pulses of a sequence and one for specifying the direction of current in each of the windings during pauses between pulses of a sequence, as well as during an energized interval preceding the beginning of a pulsed step. The microcomputer times a switch which alternately connects a driving stage to the pulse and pause control memories. Smooth operation of the stepping motor without vibration or noise is economically obtained.
REFERENCES:
patent: 4536691 (1985-08-01), Sakakibara
patent: 4600868 (1986-07-01), Bryant
IV. Controller and Driver ICs, Toshiba Corporation, TA8435H.
Bergmann Saul M.
Robert & Bosch GmbH
Shoop Jr. William M.
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