Rotor position detection in an electrical machine
First Claim
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1. A method comprising:
- determining error in the output of a rotor position transducer that directly detects a position of a rotor of an electrical machine and that outputs first signals, the determining including;
operating the electrical machine so as to produce the first signals and to produce, from a sensorless position detection algorithm, second signals representing an estimate of the position of the rotor, the sensorless position detection algorithm producing the second signals independently of and without reference to the first signals; and
comparing the first and second signals to produce an error value representing the error in the output of the rotor position transducer; and
storing the error value;
wherein the rotor position transducer provides binary first signals and is arranged in relation to the rotor of the electrical machine to produce no more than two transitions in the binary first signals in a phase inductance cycle.
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Abstract
An electrical machine has a rotor position transducer which provides output signals to a control system. The output signals contain errors due to component shortcomings and manufacturing imperfections. A method is disclosed which is able to determine the errors in the signals by the use of a position detection algorithm so as to provide compensations to the control system of the machine. The compensations may be stored in the control system and used to improve the accuracy of the transducer output signals, thus improving the output of the machine.
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Citations
15 Claims
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1. A method comprising:
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determining error in the output of a rotor position transducer that directly detects a position of a rotor of an electrical machine and that outputs first signals, the determining including; operating the electrical machine so as to produce the first signals and to produce, from a sensorless position detection algorithm, second signals representing an estimate of the position of the rotor, the sensorless position detection algorithm producing the second signals independently of and without reference to the first signals; and comparing the first and second signals to produce an error value representing the error in the output of the rotor position transducer; and
storing the error value;wherein the rotor position transducer provides binary first signals and is arranged in relation to the rotor of the electrical machine to produce no more than two transitions in the binary first signals in a phase inductance cycle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. Apparatus comprising:
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a rotor position transducer that directly detects a position of a rotor of an electrical machine and that outputs first signals; means for carrying out a sensorless position detection algorithm that produces second signals representing an estimate of the position of the rotor, the sensorless position detection algorithm producing the second signals independently of and without reference to the first signals; control means for operating the electrical machine so as to produce the first and second signals; and means for comparing the first and second signals to produce an error value representing error in the output of the rotor position transducer; wherein the rotor position transducer provides binary first signals and is arranged in relation to the rotor of the electrical machine to produce no more than two transitions in the binary signals in a phase inductance cycle of the machine. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification
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Current AssigneeNidec S R Drives Ltd (Nidec Corporation)
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Original AssigneeSwitched Reluctance Drives Limited (Nidec Corporation)
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InventorsMcClelland, Michael Leo, Moriarty, Peter Mark, Tankard, Michael Paul
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Primary Examiner(s)Lau; Tung S
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Application NumberUS11/159,943Publication NumberTime in Patent Office1,650 DaysField of Search702/94, 702/150, 333/20, 212/150US Class Current702/94CPC Class CodesH02P 25/089 Sensorless control direct t...H02P 6/18 without separate position d...
