Rotor position detection in an electrical machine
First Claim
1. A method of determining error in the output of a rotor position transducer providing binary signals and being arranged in relation to the rotor of an electrical machine to produce no more than two transitions in the binary signals in a phase inductance cycle, the method comprising;
- creating an event associated with at least one phase inductance cycle of the machine; and
comparing the actual occurrence of the event with a transition in the output of the rotor position transducer to produce an error value.
2 Assignments
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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. An apparatus is disclosed which is able to determine the errors in the signals and 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.
24 Citations
27 Claims
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1. A method of determining error in the output of a rotor position transducer providing binary signals and being arranged in relation to the rotor of an electrical machine to produce no more than two transitions in the binary signals in a phase inductance cycle, the method comprising;
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creating an event associated with at least one phase inductance cycle of the machine; and
comparing the actual occurrence of the event with a transition in the output of the rotor position transducer to produce an error value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. Apparatus for determining the error in the output of a rotor position transducer providing binary signals and being arranged in relation to a rotor of an electrical machine to produce no more than two transitions in the binary signals in a phase inductance cycle of the machine, the apparatus comprising:
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means for positioning the machine to create an event associated with at least one phase inductance cycle of the machine;
means for monitoring for occurrence of the event; and
means responsive to the means for monitoring for comparing the actual occurrence of the event with a transition in the output of the rotor position transducer to produce an error value. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification