Acceleration shaping circuit for a stepper motor
First Claim
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1. An acceleration shaping circuit for a stepper motor, said acceleration shaping circuit providing a variable ramp voltage, comprising, in combination:
- a power supply;
source means, couplable to said power supply, for providing a substantially constant current;
first voltage storage means, coupled to said source means, for receiving said substantially constant current, said first voltage storage means charging substantially linearly in response thereto to provide a substantially linear ramp voltage;
a first resistance element;
second voltage storage means, coupled to said first resistance elements and couplable to said power supply, for receiving a current from said power supply through said first resistance element, said second voltage storage means charging substantially exponentially in response thereto to provide a substantially exponential ramp voltage; and
a first adjustable resistance element having a first end terminal, a second end terminal and a wiper, said first end terminal being coupled to said first voltage storage means and said second end terminal being coupled to said second voltage storage means, said variable ramp voltage being available at said wiper and being variable between said substantially linear ramp voltage across said first voltage storage means and said substantially exponential ramp voltage across said second voltage storage means.
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Abstract
An acceleration shaping circuit for a stepper motor is described and includes two voltage storage devices. One is charged linearly and the other is charged exponentially. The output ramp voltage is an adjustable combination of the two stored voltages and is therefore variable between a linear ramp voltage and an exponential ramp voltage.
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10 Claims
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1. An acceleration shaping circuit for a stepper motor, said acceleration shaping circuit providing a variable ramp voltage, comprising, in combination:
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a power supply; source means, couplable to said power supply, for providing a substantially constant current; first voltage storage means, coupled to said source means, for receiving said substantially constant current, said first voltage storage means charging substantially linearly in response thereto to provide a substantially linear ramp voltage; a first resistance element; second voltage storage means, coupled to said first resistance elements and couplable to said power supply, for receiving a current from said power supply through said first resistance element, said second voltage storage means charging substantially exponentially in response thereto to provide a substantially exponential ramp voltage; and a first adjustable resistance element having a first end terminal, a second end terminal and a wiper, said first end terminal being coupled to said first voltage storage means and said second end terminal being coupled to said second voltage storage means, said variable ramp voltage being available at said wiper and being variable between said substantially linear ramp voltage across said first voltage storage means and said substantially exponential ramp voltage across said second voltage storage means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification