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US 2003/0111975 A1Published application
Rotor position detection of a switched reluctance drive
AssigneeSwitched Reluctance Drives Limited
InventorHoward James Slater
Life of this patent
Estimating the term…
Abstract
A switched reluctance drive is controlled without using a physical rotor position detector. The control method estimates the standing flux-linkage associated with the phase and uses this estimate to improve its estimate of rotor position. The method works robustly regardless of whether the current is continuous or discontinuous.
Claims23
A method of detecting rotor position in a reluctance machine, comprising:
- deriving a value for flux linkage associated with the or at least one phase of the machine at a first point, at a moment at which voltage is applied to that phase;
- deriving a value of phase current and phase flux linkage at a subsequent point;
- combining the derived flux linkage values to give a value of total flux linkage at the subsequent point;
- and
- deriving the rotor position from the phase current and the value of the total flux linkage.
2 more elements
A rotor position detector for a reluctance machine comprising:
- means for determining a value for flux linkage associated with the or at least one phase of the machine at a first point, at a moment when voltage is applied to that phase;
- means for deriving a value of phase current and phase flux linkage at a subsequent point;
- means for combining the derived flux linkage values to give a value of total flux linkage at the subsequent point;
- and
- means for deriving the rotor position from the phase current and the value of total flux linkage.
2 more elements
Dependencies are inferred from the claim text.