ENHANCED INDUCTIVE SENSE USING MUTUAL INDUCTANCE
First Claim
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1. A method for determining rotor position in a motor including a rotor and stator windings, comprising:
- measuring inductive sense values for each pair of the stator windings by performing an inductive sense routine on the motor;
measuring stator winding voltage values, induced by mutual inductance between windings, for each of the stator windings by performing a mutual inductance sensing routine on the motor; and
determining the rotor position based on the inductive sense values and the stator winding voltage values.
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Abstract
Methods and apparatus for determining rotor position in a motor including a rotor and stator windings. The method includes measuring inductive sense values for each pair of the stator windings by performing an inductive sense routine on the motor, measuring stator winding voltage values, induced by mutual inductance between windings, for each of the stator windings by performing a mutual inductance sensing routine on the motor, and determining the rotor position based on the inductive sense values and the stator winding voltage values.
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Citations
21 Claims
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1. A method for determining rotor position in a motor including a rotor and stator windings, comprising:
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measuring inductive sense values for each pair of the stator windings by performing an inductive sense routine on the motor; measuring stator winding voltage values, induced by mutual inductance between windings, for each of the stator windings by performing a mutual inductance sensing routine on the motor; and determining the rotor position based on the inductive sense values and the stator winding voltage values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for determining rotor position in a motor including a rotor and three stator windings, comprising:
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measuring inductive sense values for each pair of the stator windings by determining a time for a current through each pair of stator windings to reach a current limit; measuring stator winding voltage values, induced by mutual inductance between windings, for each of the stator windings by supplying a current through a pair of the stator windings and measuring the zero crossings of a voltage across a third winding of the stator windings; and determining the rotor position by accessing an entry in a table based on the measured inductive sense values and the measured stator winding voltage values.
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12. Apparatus for determining rotor position in a motor including a rotor and stator windings, comprising:
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first circuitry configured to measure inductive sense values for each pair of the stator windings by performing an inductive sense routine on the motor; second circuitry configured to measure stator winding voltage values, induced by mutual inductance between windings, for each of the stator windings by performing a mutual inductance sensing routine on the motor; and processing circuitry configured to determine the rotor position based on the inductive sense values and the stator winding voltage values. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification