Method and apparatus for driving a stepper motor with multiple voltages
AssigneeInternational Business Machines Corporation
InventorsJohn P. Bolash, Joel G. Goodwin, Nicholas J. Krull
Life of this patent
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Abstract
The invention is for an improved method and apparatus of driving a stepper motor with multiple voltages. A first voltage is applied to the step motor winding for a driving phase, and a second higher voltage is applied to the same motor winding during the same driving phase just prior to and substantially until the time that the winding is de-energized.
Claims24
A method for driving a stepper motor with multiple excitations, the method comprising
- applying a first excitation to a motor winding during a driving phase;
- and
- subsequently applying a second excitation having a voltage higher than the first excitation to the same motor winding during the same driving phase and at least just prior to and continuing substantially until the time that the winding is de-energized at the end of the driving phase.
A method for driving a stepper motor with a plurality of excitations, the method comprising applying a higher voltage excitation to the motor winding during a driving phase just prior to and continuing substantially until the time that the winding is de-energized at the end of the driving phase, the higher voltage excitation being of a voltage higher than the immediately preceding voltage applied to the motor winding during the same of the driving phase.
Apparatus for driving a stepper motor with multiple excitations, the apparatus comprising
- means for applying a first excitation to a motor winding during a driving phase;
- and
- means for subsequently applying a second excitation having a voltage higher than the first excitation to the same motor winding during the same driving phase and at least just prior to and continuing substantially until the time that the winding is deenergized at the end of the driving phase.
Apparatus for driving a stepper motor with a plurality of voltages, the apparatus comprising means for applying a higher voltage to the motor winding during a driving phase just prior to and continuing substantially until time that the winding is de-energized at the end of the driving phase, the higher voltage being of a voltage higher than the immediately preceding voltage applied to the motor winding during the same the driving phase.
Apparatus for driving a multi-coil stepper motor with multiple excitations, the apparatus comprising
- a source of high voltage;
- a source of low voltage;
- switching means for selectively applying the high and low voltages to selected stepper motor windings in response to control signals;
- and
- control means for applying a predetermined timed sequence of control signals to said switching means, said switching means applying a low voltage excitation to a selected stepper motor winding during a driving phase and subsequently applying a high voltage excitation to the same motor winding during the same driving phase at least just prior to and continuing substantially until time that the winding is de-energized at the end of driving phase.
Dependencies are inferred from the claim text.