Controller for driving a stepper motor
First Claim
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1. A controller for driving a stepper motor with a magnetic rotor and at least one coil, the controller comprising:
- a power stage for supplying the at least one coil with current, the power stage having an input including a comparator, a filter means connected to the comparator, a power amplifier connected to the filter means and an output connected to the power amplifier and configured for connection with the at least one coil, the power stage having a current feedback loop connecting the output of said power stage to an input of said comparator to feed an output signal at the output of the power stage back to the input,at least one analog Hall sensor mounted near the magnetic rotor and magnetically sensing a position of the magnetic rotor with respect to the Hall sensor and providing an output signal at an output, anda feedback line connecting the output of the Hall sensor with a multiplier whose output is connected to the input of the comparator to feed the output signal of the Hall sensor back to the power stage, which is configured to supply a current to the at least one coil as a function of the signal of the Hall sensor,wherein the comparator receives the signal from the multiplier and the signal from the output of the power stage;
wherein the at least one analog Hall sensor provides a substantially sinusoidal signal when the rotor is rotating.
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Abstract
A controller is provided for driving a stepper motor with a magnetic rotor and at least one coil. The controller has a power stage for supplying the at least one coil with current, at least one analog Hall sensor for providing a signal as a function of the position of the magnetic rotor with respect to the Hall sensor, and a feedback line connecting the Hall sensor with the power stage to feed the signal of the Hall sensor back to the power stage.
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Citations
16 Claims
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1. A controller for driving a stepper motor with a magnetic rotor and at least one coil, the controller comprising:
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a power stage for supplying the at least one coil with current, the power stage having an input including a comparator, a filter means connected to the comparator, a power amplifier connected to the filter means and an output connected to the power amplifier and configured for connection with the at least one coil, the power stage having a current feedback loop connecting the output of said power stage to an input of said comparator to feed an output signal at the output of the power stage back to the input, at least one analog Hall sensor mounted near the magnetic rotor and magnetically sensing a position of the magnetic rotor with respect to the Hall sensor and providing an output signal at an output, and a feedback line connecting the output of the Hall sensor with a multiplier whose output is connected to the input of the comparator to feed the output signal of the Hall sensor back to the power stage, which is configured to supply a current to the at least one coil as a function of the signal of the Hall sensor, wherein the comparator receives the signal from the multiplier and the signal from the output of the power stage; wherein the at least one analog Hall sensor provides a substantially sinusoidal signal when the rotor is rotating. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification