Electricity: motive power systems – Open-loop stepping motor control systems
Patent
1998-04-14
1999-08-03
Ip, Paul
Electricity: motive power systems
Open-loop stepping motor control systems
318695, 318685, 318254, 427256, 604 66, 604 67, H02P 800
Patent
active
059329874
ABSTRACT:
A method and apparatus for controlling a low volume, low rate precision dispensing pump for photochemicals and the like comprises generating constant current signals having magnitudes related by sin and cos values to the angular step size of the stepper motor pump, and varying the magnitudes smoothly over an incremental range of angles to vary the quantity of liquid dispensed. The step size and step rate can be varied to provide a desired liquid dispense rate. The magnitude of the current applied to the motor is ramped up and down while maintaining constant the relative relationships in the magnitudes of the currents applied in order to smoothly step the motor over a desired step angle.
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Ip Paul
Millipore Corporation
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