PM BRUSHLESS MOTOR DRIVE CIRCUIT TOPOLOGY AND CONTROL
First Claim
Patent Images
1. A motor drive system comprising:
- a first capacitive element that stores energy so as to provide a first direct current (dc) voltage supply;
a second capacitive element that stores energy so as to provide a second dc voltage supply;
a first electrically conductive switch for electrically connecting in series with a winding of a single motor phase and the first capacitive clement to form a first series circuit when the first switch conducts current; and
a second electrically conductive switch for electrically connecting in series with the motor phase winding and the second capacitive element to form a second series circuit when the second switch conducts current, wherein;
the entire voltage of the first capacitive element is applied across the motor phase winding, less the voltage drop across the first switch and the voltage drop resulting from parasitic resistance in the first series circuit, when;
(1) the second switch does not conduct current and (2) the second capacitive element is neither being charged nor discharged, andthe entire voltage of the second capacitive element is applied across the motor phase winding, less the voltage drop across the second switch and the voltage drop resulting from parasitic resistance in the second series circuit, when;
(1) the first switch does not conduct current and (2) the first capacitive element is neither being charged nor discharged.
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Accused Products
Abstract
An inverter for a permanent magnet brushless do machine, having a permanent magnet rotor and a set of stator windings, applies the full dc voltage provided to the inverter to each phase of the machine.
30 Citations
14 Claims
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1. A motor drive system comprising:
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a first capacitive element that stores energy so as to provide a first direct current (dc) voltage supply; a second capacitive element that stores energy so as to provide a second dc voltage supply; a first electrically conductive switch for electrically connecting in series with a winding of a single motor phase and the first capacitive clement to form a first series circuit when the first switch conducts current; and a second electrically conductive switch for electrically connecting in series with the motor phase winding and the second capacitive element to form a second series circuit when the second switch conducts current, wherein; the entire voltage of the first capacitive element is applied across the motor phase winding, less the voltage drop across the first switch and the voltage drop resulting from parasitic resistance in the first series circuit, when;
(1) the second switch does not conduct current and (2) the second capacitive element is neither being charged nor discharged, andthe entire voltage of the second capacitive element is applied across the motor phase winding, less the voltage drop across the second switch and the voltage drop resulting from parasitic resistance in the second series circuit, when;
(1) the first switch does not conduct current and (2) the first capacitive element is neither being charged nor discharged. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A motor drive system comprising:
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a phase winding of a motor that applies electromotive force to a rotor of the motor; a first capacitive element that stores energy so as to provide a first direct current (dc) voltage supply; a second capacitive element that stores energy so as to provide a second dc voltage supply; a first electrically conductive switch for electrically connecting in series with the motor phase winding and the first capacitive element to form a first series circuit when the first switch conducts current; and a second electrically conductive switch for electrically connecting in series with the motor phase winding and the second capacitive element to form a second series circuit when the second switch conducts current, wherein; the entire voltage of the first capacitive element is applied across the motor phase winding, less the voltage drop across the first switch and the voltage drop resulting from parasitic resistance in the first series circuit, when;
(1) the second switch does not conduct current and (2) the second capacitive element is neither being charged nor discharged, and the entire voltage of the second capacitive element is applied across the motor phase winding, less the voltage drop across the second switch and the voltage drop resulting from parasitic resistance in the second series circuit, when;
(1) the first switch does not conduct current and (2) the first capacitive element is neither being charged nor discharged. - View Dependent Claims (9, 10)
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11. A motor drive system comprising:
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a first capacitive element that stores energy so as to provide a first direct current (dc) voltage supply; a second capacitive element that stores energy so as to provide a second dc voltage supply; and first, second, third, and fourth electrically conductive switches each comprising an input current terminal and an output current terminal, wherein; a first terminal of the first capacitive element is electrically connected directly to the input current terminals of the first and second switches, a second terminal of the first capacitive element is electrically connected directly to a first terminal of the second capacitive element, a second terminal of the second capacitive element is electrically connected directly to the output current terminals of the third and fourth switches, the output current terminal of the first switch is electrically connected directly to the input current terminal of the third switch, the output current terminal of the second switch is electrically connected directly to the input current terminal of the fourth switch, a first terminal of a winding of a first motor phase is electrically connected directly to the second terminal of the first capacitive element and the first terminal of the second capacitive element, a second terminal of the first motor phase winding is electrically connected directly to the output current terminal of the first switch and the input current terminal of the third switch, a first terminal of a winding of a second motor phase is electrically connected directly to the second terminal of the first capacitive element and the first terminal of the second capacitive element, a second terminal of the second motor phase winding is electrically connected directly to the output current terminal of the second switch and the input current terminal of the fourth switch. - View Dependent Claims (12, 13)
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14. A motor drive method comprising:
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discharging energy stored by a first capacitive element into a single electrical phase of a motor, via a first electrically conductive switch, such that the entire voltage across the first capacitive element is applied across the motor phase winding, less the voltage drop across the first switch and the voltage drop resulting from parasitic resistance in a first series circuit comprising the first capacitive element, the first switch, and the motor phase winding; discharging energy stored by the motor phase winding into a second capacitive element, via a second electrically conductive switch, such that the entire voltage across the motor phase winding is applied across the second capacitive element, less the voltage drop across the second switch and the voltage drop resulting from parasitic resistance in a second series circuit comprising the second capacitive element, the second switch, and the motor phase winding.
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Specification