Method for initializing position with an encoder
First Claim
1. A method for detecting an absolute rotational position of an electromechanical device or at least one component thereof comprising:
- using a pair of signals to determine a relative position of the electromechanical device or the at least one component thereof from a starting point;
obtaining a commutation index signal;
determining a first absolute position of the electromechanical device or the at least one component thereof based on the commutation index signal;
obtaining a Z-index signal; and
determining a second absolute position of the electromechanical device or the at least one component thereof based on the Z-index signal.
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Abstract
A method for detecting an absolute rotational position of an electromechanical device or the at least one component thereof comprising determining a first absolute position of the electromechanical device or the at least one component thereof based on a commutation index signal, obtaining a Z-index signal, and determining a second absolute position of the electromechanical device or the at least one component thereof based on the Z-index signal. The method initially determines a coarse rotational position of the electromechanical device such as a rotor or steering wheel based on the commutation index signal. When a device'"'"'s position is first initialized by a commutation index signal before the Z-index pulse is detected, the device'"'"'s position is re-initialized upon detection of the Z-Index pulse to provide a more accurate absolute device rotational position.
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Citations
14 Claims
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1. A method for detecting an absolute rotational position of an electromechanical device or at least one component thereof comprising:
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using a pair of signals to determine a relative position of the electromechanical device or the at least one component thereof from a starting point;
obtaining a commutation index signal;
determining a first absolute position of the electromechanical device or the at least one component thereof based on the commutation index signal;
obtaining a Z-index signal; and
determining a second absolute position of the electromechanical device or the at least one component thereof based on the Z-index signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification