Switched Reluctance Drives Limited

Nidec Sr Drives, Ltd

Peter Mark Moriarty

Michael Paul Tankard

Michael Leo McClelland

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.

Rotor position detection in an electrical machine

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.

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.

A reluctance drive includes a stator, a phase winding ( ) on the stator, a rotor ( ) that is movable relative to the stator, a controller for applying a current to the phase winding ( ), and a sensor for measuring the phase current in the winding ( ). Aspects of the invention detect when the phase current has passed its peak, compute when the peak phase current occurred using information on when the phase current passed its peak, determine rotor position using the computed position of the peak phase current.

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Knaresborough, United Kingdom

Peter Mark Moriarty