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US 7,295,000 B2Granted
Method for detecting disturbances when determining the rotational speed of a rotor and evaluation circuit
AssigneeInfineon Technologies AG
InventorTobias Werth
Life of this patent
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Abstract
The invention relates to a rotary encoder and to a method for detecting disturbances in such a rotary encoder. In this case, vibrations or other disturbances are detected by means of the phase difference between a rotational speed signal, which represents a rotational speed of a rotor, and a direction of rotation signal, which represents a direction of rotation of the rotor.
Claims11
A method for detecting disturbances when determining a rotational speed of a rotor, the method comprising:
- providing a first rotational speed signal representative of a rotational speed of the rotor;
- providing a first direction of rotation signal representative of a direction of rotation of the rotor;
- and
- determining a phase difference between the first rotational speed signal and the first direction of rotation signal.
1 more element
A method for generating a signal containing information about a rotational speed or direction of a rotor, the method comprising:
- providing a first rotational speed signal representing the rotational speed of a rotor;
- providing a first direction of rotation signal representing the direction of rotation of the rotor;
- detecting disturbances by analyzing a phase difference between the first rotational speed signal and the first direction rotation signal;
- and
- in cases where no disturbance is detected, generating an output signal based on the first rotational speed signal or the first direction of rotation signal.
2 more elements
Dependencies are inferred from the claim text.