Compensating hysteresis bands to hold specified switching frequency
First Claim
1. A control system for compensating a hysteresis band of a switched reluctance (SR) machine having a rotor and a stator, the control system comprising:
- a converter circuit operatively coupled to the stator and including a plurality of switches in selective communication with each phase of the stator; and
a controller in communication with each of the stator and the converter circuit, the controller being configured to monitor at least one phase current of the SR machine relative to each of an upper current threshold and a lower current threshold of the hysteresis band, determine an adjustment value based on a difference between the phase current and an exceeded one of the upper and lower current thresholds if the phase current exceeds either current threshold, and compensate the current thresholds by the adjustment value.
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Accused Products
Abstract
A control system for compensating a hysteresis band of a switched reluctance (SR) machine having a rotor and a stator is provided. The control system may include a converter circuit and a controller. The converter circuit may be operatively coupled to the stator and include a plurality of switches in selective communication with each phase of the stator. The controller may be in communication with each of the stator and the converter circuit, and configured to monitor at least one phase current of the SR machine relative to a current threshold of the hysteresis band, determine an adjustment value based on a difference between the phase current and the current threshold if the phase current exceeds the current threshold, and compensate the current threshold by the adjustment value.
21 Citations
20 Claims
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1. A control system for compensating a hysteresis band of a switched reluctance (SR) machine having a rotor and a stator, the control system comprising:
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a converter circuit operatively coupled to the stator and including a plurality of switches in selective communication with each phase of the stator; and a controller in communication with each of the stator and the converter circuit, the controller being configured to monitor at least one phase current of the SR machine relative to each of an upper current threshold and a lower current threshold of the hysteresis band, determine an adjustment value based on a difference between the phase current and an exceeded one of the upper and lower current thresholds if the phase current exceeds either current threshold, and compensate the current thresholds by the adjustment value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of controlling hysteresis compensation, the method comprising the steps of:
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monitoring at least one parameter relative to each of an upper threshold and a lower threshold of a hysteresis band; determining an adjustment value based on a difference between the at least one parameter and any exceeded one of the upper and lower thresholds; and adjusting each of the upper and lower thresholds of the hysteresis band by the adjustment value. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A method of providing hysteresis compensation for a switched reluctance (SR) machine having a rotor and a stator, the method comprising the steps of:
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monitoring a phase current through at least one phase of the stator relative to each of an upper current threshold and a lower current threshold of a hysteresis band; determining a difference value between the phase current and any one of the upper and lower current thresholds exceeded by the phase current; determining an adjustment value based at least partially on the difference value; and adjusting each of the upper and lower current thresholds of the hysteresis band by the adjustment value. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification