Estimator initialization circuit and method for a sensorless switched reluctance machine system
AssigneeSundstrand Corporation
InventorsStephen R. Jones, Barry T. Drager
Life of this patent
Estimating the term…
Abstract
An estimator initialization circuit for a sensorless switched reluctance machine system pulses phase windings of the machine a certain number of times and derives initial values for an estimator of the system.
Claims16
Apparatus for developing an initial estimate of a condition of a machine having a plurality of phase windings each coupled to a power converter, wherein a first circuit is coupled to the phase windings for developing a plurality of phase relative angle estimates and a second circuit is coupled to the first circuit and combines the plurality of phase relative angle estimates into a single estimate, comprising:
- means for pulsing the phase windings during an initialization period such that the second circuit develops a sequence of phase relative angle estimates;
- and
- means coupled to the second circuit for deriving the initial estimate of the machine condition from the sequence of phase relative angle estimates.
In a sensorless control for a switched reluctance machine having a plurality of phase windings each coupled to a power converter, a first circuit coupled to the phase windings for developing a plurality of phase relative angle estimates, a second circuit for combining the plurality of phase relative angle estimates into a single estimate, apparatus for developing an initial estimate of a machine condition, comprising:
- means for pulsing the phase windings during an initialization period such that the second circuit develops a sequence of phase relative angle estimates;
- and
- means coupled to the second circuit for deriving the initial estimate of the machine condition from the sequence of phase relative angle estimates.
A method of developing an initial estimate of a condition of a machine having a plurality of phase windings each coupled to a power converter, wherein a first circuit is coupled to the phase windings for developing a plurality of phase relative angle estimates and a second circuit is coupled to the first circuit and combines the plurality of phase relative angle estimates into a single estimate, the method comprising the steps of:
- providing a number of pulses to the phase windings during an initialization period such that the second circuit develops a sequence of phase relative angle estimates;
- and
- deriving the initial estimate of the machine condition from the sequence of phase relative angle estimates.
Dependencies are inferred from the claim text.