Method and apparatus for calibrating and initializing an electronically commutated motor
First Claim
1. A method for calibrating and initializing position for a rotating device, the method comprising:
- establishing a sensor subsystem datum indicative of a measurement reference point for a sensor subsystem;
obtaining a calibration value corresponding to a distance to a selected magnetic reference position for said rotating device, relative to said sensor subsystem datum;
measuring a position and calculating a position delta relative to an initial reference;
estimating an offset from said sensor subsystem datum to said initial reference;
determining an absolute position estimate of said rotating device relative to said magnetic reference position; and
wherein said absolute position estimate is responsive to said calibration value, said position delta, and said offset from said sensor subsystem datum to said initial reference.
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Accused Products
Abstract
Disclosed herein is a method and system for initializing a rotating device such as an electronically commutated electric machine. The system comprises: an electric machine; a position sensor subsystem operatively connected to the electric machine configured to measure a position and transmit a position signal to a controller. The controller executes a method initializing position for the electric machine, the method comprising: establishing a sensor subsystem datum indicative of a measurement reference point for a sensor subsystem; obtaining a calibration value corresponding to a distance to a selected magnetic reference position for the electric machine, relative to the sensor subsystem datum; and measuring a position and calculating a position delta relative to an initial reference. The method also includes: estimating an offset from the sensor subsystem datum to an initial reference; determining an absolute position estimate of the electric machine relative to the magnetic reference position. The absolute position estimate is responsive to the calibration value, the position delta, and the offset from the sensor subsystem datum to the initial reference.
91 Citations
153 Claims
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1. A method for calibrating and initializing position for a rotating device, the method comprising:
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establishing a sensor subsystem datum indicative of a measurement reference point for a sensor subsystem;
obtaining a calibration value corresponding to a distance to a selected magnetic reference position for said rotating device, relative to said sensor subsystem datum;
measuring a position and calculating a position delta relative to an initial reference;
estimating an offset from said sensor subsystem datum to said initial reference;
determining an absolute position estimate of said rotating device relative to said magnetic reference position; and
wherein said absolute position estimate is responsive to said calibration value, said position delta, and said offset from said sensor subsystem datum to said initial reference. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102)
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103. A system for calibrating and initializing an electronically commutated electric machine, the system comprising:
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an electric machine;
a position sensor subsystem operatively connected to said electric machine configured to measure a position and transmit a position signal to a controller;
an absolute position sensor operatively connected to said controller and transmitting a position signal indicative of an absolute position of said electric machine. a relative position sensor operatively connected to said controller and transmitting a position signal indicative of a position of said electric machine. wherein said controller executes a process implementing a method for calibrating and initializing position for said electric machine, the method comprising;
establishing a sensor subsystem datum indicative of a measurement reference point for a sensor subsystem;
obtaining a calibration value corresponding to a distance to a selected magnetic reference position for said rotating device, relative to said sensor subsystem datum;
measuring a position and calculating a position delta relative to an initial reference;
estimating an offset from said sensor subsystem datum to said initial reference;
determining an absolute position estimate of said electric machine relative to said magnetic reference position; and
wherein said absolute position estimate is responsive to said calibration value, said position delta, and said offset from said sensor subsystem datum to said initial reference. - View Dependent Claims (104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151)
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152. A storage medium, said storage medium including instructions for causing a controller to implement a method for calibrating and initializing position for a rotating device:
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establishing a sensor subsystem datum indicative of a measurement reference point for a sensor subsystem;
obtaining a calibration value corresponding to a distance to a selected magnetic reference position for said rotating device, relative to said sensor subsystem datum;
measuring a position and calculating a position delta relative to an initial reference;
estimating an offset from said sensor subsystem datum to said initial reference;
determining an absolute position estimate of said rotating device relative to said magnetic reference position; and
wherein said absolute position estimate is responsive to said calibration value, said position delta, and said offset from said sensor subsystem datum to said initial reference.
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153. A computer data signal, said data signal comprising code configured to cause a controller to implement a method for determining a velocity of a rotating device, the method comprising:
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establishing a sensor subsystem datum indicative of a measurement reference point for a sensor subsystem;
obtaining a calibration value corresponding to a distance to a selected magnetic reference position for said rotating device, relative to said sensor subsystem datum;
measuring a position and calculating a position delta relative to an initial reference;
estimating an offset from said sensor subsystem datum to said initial reference;
determining an absolute position estimate of said rotating device relative to said magnetic reference position; and
wherein said absolute position estimate is responsive to said calibration value, said position delta, and said offset from said sensor subsystem datum to said initial reference.
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Specification