Absolute position sensor for field-oriented control of an induction motor
First Claim
1. An automotive drive system comprising:
- an induction motor having a rotor;
an absolute position sensor coupled to the induction motor, wherein the absolute position sensor is configured to sense an absolute angular position of the rotor; and
a controller coupled to the absolute position sensor to add a slip angle to a relative angular position of the rotor to produce a transformation angle, wherein the relative angular position is determined based on the absolute angular position.
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Accused Products
Abstract
Systems and methods are provided for an automotive drive system using an absolute position sensor for field-oriented control of an induction motor. An automotive drive system comprises an induction motor having a rotor, and a position sensor coupled to the induction motor. The position sensor is configured to sense an absolute angular position of the rotor. A processor may be coupled to the position sensor and configured to determine a relative angular position of the rotor based on a difference between the absolute angular position and an initial angular position obtained when the induction motor is started. A controller may be coupled to the induction motor and the processor and configured to provide field-oriented control of the induction motor based on the relative angular position of the rotor.
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Citations
20 Claims
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1. An automotive drive system comprising:
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an induction motor having a rotor; an absolute position sensor coupled to the induction motor, wherein the absolute position sensor is configured to sense an absolute angular position of the rotor; and a controller coupled to the absolute position sensor to add a slip angle to a relative angular position of the rotor to produce a transformation angle, wherein the relative angular position is determined based on the absolute angular position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A drive system for use in a vehicle, the drive system comprising:
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an induction motor having a rotor; a resolver integrated with the induction motor, wherein the resolver further comprises; a resolver rotor coupled to a shaft of the induction motor, wherein the resolver rotor is concentric to and integral with the shaft; and a resolver stator coupled to the induction motor, wherein the resolver stator is concentric to the resolver rotor; a resolver-to-digital converter coupled to the resolver stator, the resolver-to-digital converter being configured to convert signals from the resolver to a digital output representative of an absolute angular position of the rotor; and a controller coupled to the induction motor and the resolver-to-digital converter to determine a relative angular position of the rotor based on the absolute angular position of the rotor, determine a rotor speed based on the relative angular position, and determine a magnetizing current command to produce a desired rotor flux based on the rotor speed. - View Dependent Claims (12, 13, 14, 15)
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16. A method for controlling an induction motor having a rotor, the method comprising:
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obtaining an initial absolute angular position of the rotor using an absolute position sensor, wherein the initial absolute angular position of the rotor is obtained when the induction motor is started; obtaining a subsequent absolute angular position of the rotor using the absolute position sensor; determining a relative angular position of the rotor based on the initial absolute angular position and the subsequent absolute angular position; and determining a magnetizing current command to produce a desired rotor flux based on the relative angular position. - View Dependent Claims (17, 18, 19, 20)
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Specification