Sensorless rotor position detection for switched reluctance machines having irregular poles
AssigneeTridelta Industries, Inc.
InventorDavid J. Morris
Life of this patent
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Abstract
A system for detecting the position of a rotor for a switched reluctance (SR) machine having an irregular pole configuration. The system does not require the use of a conventional sensing device, and provides accurate position information, without disrupting operation of the machine. A voltage ratio is used to infer the position of the rotor relative to the stator.
Claims49
A method of position detection in a switched reluctance (SR) machine having a rotor including a plurality of rotor poles and a stator having a plurality of stator poles, wherein at least one of said rotor and/or said stator has an irregular pole configuration for at least one respective rotor and stator pole, the method comprising:
- sensing a first voltage across a first coil set of a first phase winding associated with at least one of the plurality of stator poles, without introducing a test current into the first phase winding;
- determining a rotor position based upon the first voltage, wherein an encoder output signal is derived in accordance with said rotor position.
A method of position detection in a switched reluctance (SR) machine having a rotor including a plurality of rotor poles and a stator having a plurality of stator poles, wherein at least one of said rotor and/or said stator has an irregular pole configuration for at least one respective rotor and stator pole, the method comprising:
- sensing a first voltage across a first coil set of a first phase winding associated with at least one of the plurality of stator poles, without introducing a test current into the first phase winding;
- comparing said first voltage to at least one reference value to generate a position output signal indicative of a known rotor position;
- and
- generating an encoder output signal in accordance with said position output signal to control excitation of the first phase winding.
A system of position detection in a switched reluctance (SR) machine having a rotor including a plurality of rotor poles and a stator having a plurality of stator poles, wherein at least one of said rotor and/or said stator has an irregular pole configuration for at least one respective rotor and stator pole, said system comprising:
- sensing means for sensing a first voltage across a first coil set of a first phase winding associated with at least one of the plurality of stator poles, without introducing a test current into the first phase winding;
- comparison means for comparing said first voltage to at least one reference value to generate a position output signal, indicative of a known rotor position;
- and
- means for generating an encoder output signal in accordance with said position output signal to control excitation of the first phase winding.
A system for position detection in a switched reluctance (SR) machine having a rotor including a plurality of rotor poles and a stator having a plurality of stator poles, wherein at least one of said rotor and said stator has an irregular pole configuration for at least one respective rotor and stator pole, the method comprising:
- sensing means for sensing a first voltage across a first coil set of a first phase winding associated with at least one of the plurality of stator poles, without introducing a test current into the first phase winding;
- and
- means for determining a rotor position based upon the first voltage, wherein an encoder output signal is derived in accordance with said rotor position.
A method of position detection in a switched reluctance (SR) machine having a rotor including a plurality of rotor poles and a stator having a plurality of stator poles, wherein at least one of said rotor and/or said stator has an irregular pole configuration for at least one respective rotor and stator pole, the method comprising:
- sensing a first voltage at a common node where a first pair of coils are joined, wherein the first voltage is indicative of the voltage across a first coil set of a first phase winding, said first coil set including at least one coil, and
- determining a rotor position in accordance with the first voltage, wherein an encoder output signal is derived in accordance with said rotor position.
A system for position detection in a switched reluctance (SR) machine having a rotor including a plurality of rotor poles and a stator having a plurality of stator poles, wherein at least one of said rotor and/or said stator has an irregular pole configuration for at least one respective rotor and stator pole, the system comprising:
- means for sensing a first voltage at a common node where a first pair of coils are joined, wherein the first voltage is indicative of the voltage across a first coil set of a first phase winding, said first coil set including at least one coil, and
- means for determining a rotor position in accordance with the first voltage, wherein an encoder output signal is derived in accordance with said rotor position.
Dependencies are inferred from the claim text.