Power factor correction drive circuit topologies and control for switched reluctance machines
First Claim
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1. A power converter for supplying power to a motor, the power converter comprising for a phase of the motor:
- a unidirectional current element that conveys current in a single direction;
first and second series-connected windings for the motor phase;
a capacitive element; and
first and second switches that each conducts current when activated and does not conduct current when deactivated, wherein;
the unidirectional current element, capacitive element, first and second windings, and first and second switches are interconnected such that when interconnected with a single-phase alternating current supply through a full-wave bridge rectifier;
a first operational mode of the power converter exists in which current is conducted through the first switch and the first winding, the conduction of current through the first winding imparting a motive force upon a rotor of the motor,a second operational mode of the power converter exists in which current is not conducted through the first switch and energy is transferred from the first winding to the capacitive element by the conduction of current through the first winding, the unidirectional current element, and the capacitive element, anda third operational mode exists in which energy stored in the capacitor during the second operational mode is discharged by the conduction of current through the first and second switches, capacitive element, and second winding, the conduction of current through the second winding imparting a motive force upon the motor rotor.
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Abstract
Drive circuits that provide power factor correction and input current waveform shaping for controlling the speed and torque in a switched reluctance machine (SRM). The machine'"'"'s phase windings are split into two segments, one of which is used for active power factor correction, input ac current waveform shaping and partial torque generation and the other of which is used for torque generation.
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Citations
24 Claims
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1. A power converter for supplying power to a motor, the power converter comprising for a phase of the motor:
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a unidirectional current element that conveys current in a single direction; first and second series-connected windings for the motor phase; a capacitive element; and first and second switches that each conducts current when activated and does not conduct current when deactivated, wherein; the unidirectional current element, capacitive element, first and second windings, and first and second switches are interconnected such that when interconnected with a single-phase alternating current supply through a full-wave bridge rectifier; a first operational mode of the power converter exists in which current is conducted through the first switch and the first winding, the conduction of current through the first winding imparting a motive force upon a rotor of the motor, a second operational mode of the power converter exists in which current is not conducted through the first switch and energy is transferred from the first winding to the capacitive element by the conduction of current through the first winding, the unidirectional current element, and the capacitive element, and a third operational mode exists in which energy stored in the capacitor during the second operational mode is discharged by the conduction of current through the first and second switches, capacitive element, and second winding, the conduction of current through the second winding imparting a motive force upon the motor rotor.
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2. A power converter for supplying power to a motor, the power converter comprising for two phases of the motor:
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no more than three diodes; a single capacitor; and no more than three switches that each conducts current when activated and does not conduct current when deactivated, wherein; the three diodes, capacitor, and three switches are interconnected such that when interconnected with a single-phase alternating current supply through a full-wave bridge rectifier, first and second series-connected windings for a first of the two motor phases, and third and fourth series-connected phase windings for a second of the two motor phases; a first operational mode of the power converter exists in which current is conducted through a first of the three switches and the first winding, but no current is conducted through a second of the three switches, a second operational mode of the power converter exists in which current is conducted through the second switch and the second winding, but no current is conducted through the first switch, a third operational mode exists in which energy stored in the first winding during the first operational mode is discharged into the capacitor by the conduction of current through the first winding, a first of the three diodes, and the capacitor, a fourth operational mode exists in which energy stored in the second winding during the second operational mode is discharged into the capacitor by the conduction of current through the second winding, a second of the three diodes, and the capacitor, a fifth operational mode exists in which energy stored in the capacitor during the third or fourth operational modes is discharged by the conduction of current through the third winding, the first switch, and a third of the three switches, and a sixth operational mode exists in which energy stored in the capacitor during the third or fourth operational modes is discharged by the conduction of current through the fourth winding and the second and third switches. - View Dependent Claims (3)
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4. A power converter for supplying power to a motor, the power converter comprising:
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a capacitive element; and first, second, and third switches that each conducts current in a conductive state and does not conduct current in a non-conductive state, wherein; the capacitive element and first, second, and third switches are interconnected such that when interconnected with a single-phase alternating current supply, through a full-wave bridge rectifier, first and second series-connected windings constituting a first phase of the motor, and third and fourth series-connected windings constituting a second phase of the motor; energy is transferred from the current supply to the first winding, by the conveyance of current through the first switch and first winding, when the first switch is in the conductive state, energy stored in the first winding is transferred to the capacitive element, by the conveyance of current through the first winding and capacitive element, when the first switch is in the non-conductive state, energy stored in the capacitive element is transferred to the second winding, by the conveyance of current through the first and second switches and the second winding, when the first and second switches each are in the conductive state, energy is transferred from the current supply to the third winding, by the conveyance of current through the third switch and third winding, when the third switch is in the conductive state, energy stored in the third winding is transferred to the capacitive element, by the conveyance of current through the third winding and the capacitive element, when the third switch is in the non-conductive state, and energy stored in the capacitive element is transferred to the fourth winding, by the conveyance of current through the second and third switches, the fourth winding and the capacitive element, when the second and third switches each are in the conductive state. - View Dependent Claims (5, 6, 7, 8, 9)
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10. A power converter for supplying power to a motor, the power converter comprising:
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first and second unidirectional current elements that each conducts current in a single direction; first and second capacitive elements; and first and second switches that each conducts current in a conductive state and does not conduct current in a non-conductive state, wherein; the first and second unidirectional current elements, first and second capacitive elements, and first and second switches are interconnected such that when interconnected with a single-phase alternating current supply through a full-wave bridge rectifier, first and second windings constituting a first motor phase, and third and fourth windings constituting a second motor phase; energy is transferred from the current supply to the first winding, by the conveyance of current through the first switch and first winding, when the first switch is in the conductive state, energy stored in the first winding is transferred to the first capacitive element, by the conveyance of current through the first winding, first unidirectional current element and first capacitive element, when the first switch is in the non-conductive state, energy stored in the first capacitive element is transferred to the second winding, by the conveyance of current through the first capacitive element and second winding, energy is transferred from the current supply to the third winding, by the conveyance of current through the second switch and third winding, when the second switch is in the conductive state, energy stored in the third winding is transferred to the second capacitive element, by the conveyance of current through the third winding, second unidirectional current element and second capacitive element, when the second switch is in the non-conductive state, and energy stored in the second capacitive element is transferred to the fourth winding, by the conveyance of current through the second capacitive element and fourth winding. - View Dependent Claims (11, 12, 13, 14)
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15. A power converter comprising:
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first, second, and third unidirectional current elements that each conducts current in only one direction between a current input terminal and a current output terminal; a capacitive element for storing energy across first and second terminals; and first, second, and third switches that each conducts current between a current input terminal and a current output terminal when in a conductive state and does not conduct current when in a non-conductive state, wherein; the first terminal of the capacitive element, the current input terminal of the second switch, and the current output terminals of the first and third unidirectional current elements are directly connected by a first node, the current input terminal of the first unidirectional current element is directly connected to the current input terminal of the first switch by a second node, the current output terminal of the second switch is directly connected to the current output terminal of the second unidirectional current element by a third node, the second terminal of the capacitive element is directly connected to the current output terminals of the first and third switches, and the current input terminal of the second unidirectional current element by a fourth node, and the current input terminals of the third switch and the third unidirectional current element are directly connected by a fifth node. - View Dependent Claims (16, 17, 18, 19)
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20. A power converter comprising:
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first and second unidirectional current elements that each conducts current in only one direction between a current input terminal and a current output terminal; first and second capacitive elements that each stores energy across first and second terminals; first and second switches that each conducts current between a current input terminal and a current output terminal when in a conductive state and does not conduct current when in a non-conductive state; first and second motor windings constituting a first motor phase, each of the first and second windings having first and second terminals; third and fourth motor windings constituting a second motor phase, each of the third and fourth windings having first and second terminals, wherein; the first terminals of the first and second capacitive elements and the first terminals of the first, second, third, and fourth windings are directly connected by a first node, the second terminal of the first winding and the current input terminals of the first switch and first unidirectional current element are directly connected by a second node, the second terminals of the first capacitive element and the second winding and the current output terminal of the first unidirectional current element are directly connected by a third node, the second terminal of the third winding and the current input terminals of the second switch and second unidirectional current element are directly connected by a fourth node, the second terminals of the second capacitive element and the fourth winding and the current output terminal of the second unidirectional current element are directly connected by a fifth node, and the current output terminals of the first and second switches are directly connected by a sixth node.
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21. A power converter for supplying power to a motor, the power converter comprising:
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a capacitive element; and first, second, third, and fourth switches that each conducts current in a conductive state and does not conduct current in a non-conductive state, wherein; the capacitive element and first, second, third, and fourth switches are interconnected such that when interconnected with a single-phase alternating current supply, through a full-wave bridge rectifier, first and second series-connected windings constituting a first phase of the motor, and third and fourth series-connected windings constituting a second phase of the motor; energy is transferred from the current supply to the first winding, by the conveyance of current through the first switch and first winding, when the first switch is in the conductive state, energy stored in the first winding is transferred to the capacitive element, by the conveyance of current through the first winding and capacitive element, when the first switch is in the non-conductive state, energy stored in the capacitive element is transferred to the second winding, by the conveyance of current through the first and second switches and the second winding, when the first and second switches each are in the conductive state, energy is transferred from the current supply to the third winding, by the conveyance of current through the third switch and third winding, when the third switch is in the conductive state, energy stored in the third winding is transferred to the capacitive element, by the conveyance of current through the third winding and the capacitive element, when the third switch is in the non-conductive state, and energy stored in the capacitive element is transferred to the fourth winding, by the conveyance of current through the third and fourth switches, the fourth winding and the capacitive element, when the third and fourth switches each are in the conductive state. - View Dependent Claims (22, 23, 24)
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Specification