Encoder for a permanent magnet sinusoidal brushless motor in an electric power steering system
AssigneeDelphi Technologies, Inc.
InventorMalakondaiah Naidu
Life of this patent
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Abstract
An encoder for a brushless motor of an Electric Power Steering (EPS) system that includes a commutation track coupled to a shaft for the generation of a commutation signal. The commutation signal in turn is used to generate an index signal every electrical cycle. The encoder further includes a set of high-resolution quadrature signal tracks. The set of high-resolution quadrature signal tracks generate a set of high-resolution signals which are phased at a set angular displacement with respect to one another. A set of sensors sense the commutation signal and the set of high resolution quadrature signals.
Claims20
An encoder for determining the angular position of a motor shaft, the encoder comprising:
- one commutation track having a first set of alternating teeth and slots coupled to the motor shaft;
- a set of high resolution tracks having a second set of alternating teeth and slots coupled to the motor shaft;
- and
- a set of sensors for sensing the angular position of the commutation and high resolution tracks.
A method of determining the angular position of a motor shaft, the method comprising:
- responsive to the rotation of one commutation track of the motor shaft, generating a commutation signal having a first and second level;
- sampling the commutation signal generating thereby an index signal having a first and second level;
- responsive to the rotation of a set of high resolution tracks of the motor shaft, generating a set of high resolution signals having a first and second level.
An electric power steering system comprising:
- a motor;
- a shaft coupled to a rotor of the motor;
- and
- an encoder including
- one commutation track coupled to the shaft for generating a commutation signal and an index signal every electrical cycle;
- a set of high resolution signals tracks for generating a pair of high resolution signals;
- and
- a set of sensors sensing the commutation signal and the set of high resolution signals.
Dependencies are inferred from the claim text.