Method of processing sensor signals for determining motion of a motor shaft
First Claim
1. A method of processing sensor signals to determine motion of a motor shaft, said method comprising the steps of:
- sampling a first signal and a second signal via a controller, wherein the first signal is offset from the second signal;
calculating a rotational direction and a displacement of the motor shaft from the first signal and the second signal when a count of samples taken without a state change is above a predetermined threshold; and
calculating a displacement from the first signal and the second signal when the count of samples taken without a state change is below the predetermined threshold and a previous direction is assumed.
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Accused Products
Abstract
Methods and systems of processing sensor signals to determine motion of a motor shaft are disclosed. This disclosure relates to the processing of sequences of pulses from a sensor for computing the motion of an electric motor output shaft. Furthermore, this disclosure relates to the processing of two sequences of pulses from sensor outputs, which may be separated by only a few electrical degrees, to compute the motion of an electrical motor output shaft while using a limited bandwidth controller. Motor shaft direction, displacement, speed, phase, and phase offset may be determined from processing the sensor signals.
41 Citations
19 Claims
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1. A method of processing sensor signals to determine motion of a motor shaft, said method comprising the steps of:
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sampling a first signal and a second signal via a controller, wherein the first signal is offset from the second signal; calculating a rotational direction and a displacement of the motor shaft from the first signal and the second signal when a count of samples taken without a state change is above a predetermined threshold; and calculating a displacement from the first signal and the second signal when the count of samples taken without a state change is below the predetermined threshold and a previous direction is assumed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of processing sensor signals to determine motion of a motor shaft, said method comprising the steps of:
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sampling a first signal and a second signal via a controller, wherein the first signal is offset from the second signal; determining a first speed of the motor shaft from the first signal and the second signal based on a count of samples taken by the controller without a state change occurring in the first signal and the second signal being above a predetermined threshold; determining a second speed of the motor shaft from the first signal and the second signal based on a count of samples taken by the controller without a state change occurring in the first signal or the second signal being below the predetermined threshold; and calculating a displacement of the motor shaft from the first signal and the second signal, when the count of samples taken without the state change is above the predetermined threshold. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification