Switched reluctance generators
First Claim
1. A switched reluctance generator system comprising a rotor;
- a stator having at least one phase winding, switch means, means for supplying energy to the phase winding according to actuation of the switch means, means for rotating the rotor relative to the stator and control means operable to control the switch means, the control means being arranged to actuate the switch means for supplying energy at a first voltage across at least part of the phase winding to cause flux growth at a first rate during a first part of a phase inductance cycle, and being arranged to actuate the switch means to switch a second voltage across the phase winding to cause flux decay at a second rate, which second rate of decay is slower than the first rate of flux growth, rotation of the rotor causing energy to be supplied at the second voltage from the phase winding during the second part of the phase inductance cycle.
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Accused Products
Abstract
A switched reluctance generator is controlled such that flux growth in a phase winding occurs at a faster rate during the initial part of the phase inductance cycle and at a second, slower rate during the subsequent part of the phase inductance cycle. The difference between flux growth and decay may be achieved either by applying different voltages during the two parts of the phase inductance cycle or by applying the same voltage over only part of the phase winding during the initial part of the phase inductance cycle and then applying that voltage across the phase winding thereafter. It is advantageous to make the increase in flux more rapid than its decay because minimizing the length of time that the flux is present while the phase inductance is rising will minimize the production of unwanted (motoring) torque.
39 Citations
24 Claims
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1. A switched reluctance generator system comprising a rotor;
- a stator having at least one phase winding, switch means, means for supplying energy to the phase winding according to actuation of the switch means, means for rotating the rotor relative to the stator and control means operable to control the switch means, the control means being arranged to actuate the switch means for supplying energy at a first voltage across at least part of the phase winding to cause flux growth at a first rate during a first part of a phase inductance cycle, and being arranged to actuate the switch means to switch a second voltage across the phase winding to cause flux decay at a second rate, which second rate of decay is slower than the first rate of flux growth, rotation of the rotor causing energy to be supplied at the second voltage from the phase winding during the second part of the phase inductance cycle.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of operating a switched reluctance generator comprising a rotor and a stator having at least one stator winding, the method comprising:
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rotating the rotor; switching a first voltage across at least part of the phase winding during a first part of a phase inductance cycle to cause flux growth at a first rate during the first part of the phase inductance cycle; switching a second voltage across the phase winding during a second part of the phase inductance cycle to cause flux decay at a second rate, which second rate of decay is slower than the first rate of flux growth, during the second part of the phase inductance cycle. - View Dependent Claims (13, 14, 15, 16)
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17. A switched reluctance generator comprising:
a rotor;
a stator having at least one phase winding, the rotor being rotatable relative to a stator;
switch means; and
control means operable to control the switch means, the control means being arranged to actuate the switch means to switch a first voltage across at least part of the phase winding to cause flux growth at a first rate during a first part of a phase inductance cycle of the rotor, and being arranged to actuate the switch means to switch a second voltage across the phase winding to cause flux decay at a second rate, which second rate of decay is slower than the first rate of flux growth, rotation of the rotor causing energy to be generated at the second voltage from the phase winding during the second part of the phase inductance cycle.- View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
Specification