Rotor position detection in an electrical machine
First Claim
1. A method of determining a compensation value for the output of a rotor position transducer (rpt) of an electric machine, the method comprising;
- repeatedly operating the machine under predetermined conditions and with selected candidate values of compensation applied to the output of the rotor position transducer;
recording at least one parameter of the machine as a set of test results for the candidate values of rpt output compensation;
selecting from the test results a desired value of the rpt output compensation; and
subsequently using the desired value to compensate the output of the rotor position transducer.
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Accused Products
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 successively running the machine with a series of assumed errors in the rpt signals and building up a set of test results. These results are subsequently compared with each other so as to determine the optimum value of corrections to the control system of the machine. The correction 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
10 Claims
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1. A method of determining a compensation value for the output of a rotor position transducer (rpt) of an electric machine, the method comprising;
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repeatedly operating the machine under predetermined conditions and with selected candidate values of compensation applied to the output of the rotor position transducer; recording at least one parameter of the machine as a set of test results for the candidate values of rpt output compensation; selecting from the test results a desired value of the rpt output compensation; and subsequently using the desired value to compensate the output of the rotor position transducer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of determining a rotor position compensation value for a rotor position output of a rotor position transducer of an electric machine, the method comprising:
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repeatedly operating the machine under predetermined conditions and with selected candidate values of rotor position compensation applied to the rotor position output of the rotor position transducer; recording at least one parameter of the machine as a set of test results for the candidate values of rotor position compensation; selecting from the teat results a desired value of the rotor position compensation; and subsequently using the desired value to compensate the rotor position output of the rotor position transducer.
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Specification