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US 4,490,665 AGranted
Method for driving a stepper motor
AssigneeBeckman Instruments, Inc.
InventorsRichard C. Meyer, Peter Kan
Life of this patent
Estimating the term…
Abstract
A method for driving a stepper motor. The method includes varying the width of the high level drive impulses of a bi-level drive system based on the desired speed to be achieved by the stepper motor. A microprocessor is used to vary the pulse width.
Claims4
A method for driving a stepper motor wherein at least some steps of the motor rotation each comprise:
- supplying a first voltage to the motor for a time period, such time period being selected as a function of the required speed of the motor;
- and
- supplying a second lower voltage to the motor for the remainder of the motor step after the time period ends.
A method for driving a stepper motor wherein at least some steps of the motor rotation each comprise:
- beginning the motor step by supplying a first voltage to the motor;
- terminating the first voltage at a time defining a time period which is a function of the required speed of the motor, such time period increasing with increasing required motor speed;
- and
- supplying a second lower voltage to the motor for the remainder of the motor step upon the termination of the first voltage.
1 more element
Dependencies are inferred from the claim text.