Switched reluctance initial rotor position estimation
AssigneeCaterpillar Inc.
InventorsJesse Gerdes, Jackson Wai, Mark Hartman, Ahmed Khalil, Carlos Nino Baron
Life of this patent
Estimating the term…
Abstract
A method of estimating an initial rotor position of a switched reluctance (SR) machine having a rotor and a stator is provided. The method may comprise the steps of driving a phase current in each of a plurality of phases of the SR machine to a predefined limit, performing an integration of a common bus voltage associated with each phase, determining a flux value for each phase based on the integrations, and determining the initial rotor position based on the flux values.
Claims17
A method of estimating an initial rotor position of a switched reluctance (SR) machine having a rotor and a stator, comprising the steps of:
- driving a phase current in each of a plurality of phases of the SR machine to a predefined limit;
- performing an integration of a common bus voltage associated with each phase;
- determining a flux value for each phase based on the integrations;
- determining the initial rotor position based on the flux values;
- determining a middle flux value based on relative magnitudes of the flux values;
- determining the phase corresponding to the middle flux value;
- and
- determining the initial rotor position based on the middle flux value and the corresponding phase.
An initial rotor position estimation system for a switched reluctance (SR) machine having a rotor and a stator, comprising:
- a converter circuit in electrical communication between the stator and a common bus;
- and
- a controller in electrical communication with at least the converter circuit, the controller being configured to drive a phase current in each of a plurality of phases of the SR machine to a predefined limit, integrate a voltage across the common bus in association with each phase, determine a flux value for each phase based on the integrations, determine an initial position of the rotor based on the flux values, determine a middle flux value based on relative magnitudes of the flux values, determine the phase corresponding to the middle flux value, and determine the initial rotor position based on the middle flux value and the corresponding phase.
An electric drive apparatus, comprising:
- a switched reluctance (SR) machine having a stator and a rotor, the rotor being coupled to a primary power source and rotatably disposed in proximity to the stator;
- a converter circuit configured to electrically communicate with the stator and a common bus;
- and
- a controller in electrical communication with at least the converter circuit, the controller being configured to drive a phase current in each of a plurality of phases of the SR machine to a predefined limit, integrate a voltage across the common bus in association with each phase, determine a flux value for each phase based on the integrations, determine an initial position of the rotor based on the flux values, determine a middle flux value based on relative magnitudes of the flux values, determine the phase corresponding to the middle flux value, and determine the initial rotor position based on the middle flux value and the corresponding phase.
Dependencies are inferred from the claim text.