Unipolar drive topology for permanent magnet brushless DC motors and switched reluctance motors
First Claim
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1. A unipolar drive, comprising:
- a booster comprising a first transistor, a first capacitor coupled to a first transistor terminal of the first transistor, and a first inductor coupled to the first capacitor and the first transistor terminal of the first transistor;
an energy storage module coupled to the booster, the energy storage module comprising a second inductor coupled to the first capacitor, a second capacitor connected coupled to the second inductor at a first capacitor terminal of the second capacitor, and a first diode coupled to a second transistor terminal of the first transistor and a second capacitor terminal of the second capacitor, wherein the energy storage module is operable to transfer energy from the second capacitor to the booster using the first diode;
a unipolar inverter, comprising;
a plurality of windings for a motor;
a plurality of second transistors, each second transistor connected in series to one of the windings, and each second transistor operable to cause the respective winding to be energized; and
a plurality of second diodes, each second diode coupled to one of the windings between the respective winding and the transistor in series with the winding, and each second diode operable to return energy from the respective winding to the energy storage module and the booster when the respective winding is not being energized;
a voltage comparator operable to control the first transistor based on a comparison between an output voltage of the booster and a reference voltage; and
a hysteresis comparator operable to control the second transistors based on a comparison between a reference frequency and a measured frequency of a motor driven by the unipolar drive.
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Abstract
A unipolar drive includes a booster, an energy storage module, and a unipolar inverter. The booster increase a voltage received from a power supply to produce an energy output. The energy storage module store at least some of the energy output by the booster. The unipolar inverter energizes windings of a motor using energy from the booster and returns energy from the windings to the booster when the windings are not being energized.
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Citations
15 Claims
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1. A unipolar drive, comprising:
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a booster comprising a first transistor, a first capacitor coupled to a first transistor terminal of the first transistor, and a first inductor coupled to the first capacitor and the first transistor terminal of the first transistor; an energy storage module coupled to the booster, the energy storage module comprising a second inductor coupled to the first capacitor, a second capacitor connected coupled to the second inductor at a first capacitor terminal of the second capacitor, and a first diode coupled to a second transistor terminal of the first transistor and a second capacitor terminal of the second capacitor, wherein the energy storage module is operable to transfer energy from the second capacitor to the booster using the first diode; a unipolar inverter, comprising; a plurality of windings for a motor; a plurality of second transistors, each second transistor connected in series to one of the windings, and each second transistor operable to cause the respective winding to be energized; and a plurality of second diodes, each second diode coupled to one of the windings between the respective winding and the transistor in series with the winding, and each second diode operable to return energy from the respective winding to the energy storage module and the booster when the respective winding is not being energized; a voltage comparator operable to control the first transistor based on a comparison between an output voltage of the booster and a reference voltage; and a hysteresis comparator operable to control the second transistors based on a comparison between a reference frequency and a measured frequency of a motor driven by the unipolar drive.
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2. A unipolar drive, comprising:
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a booster operable to increase a voltage received from a power supply to produce an energy output; an energy storage module operable to store at least some of the energy output by the booster; and a unipolar inverter operable to energize windings of a motor using energy from the booster, wherein the unipolar inverter is further operable to return energy from the windings to the booster when the windings are not being energized, wherein the unipolar inverter comprises; a plurality of transistors, each transistor coupled to a winding of the motor, and each transistor operable to cause the respective winding to become energized; and a plurality of diodes, each diode coupled to one of the windings, and each diode operable to carry energy from the windings to the booster when the windings are not being energized. - View Dependent Claims (3)
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4. A method for driving a motor, comprising:
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receiving a voltage input from a power supply; boosting the voltage received from the power supply; energizing windings of the motor by unipolar inverter using the boosted voltage; storing at least some of the energy not used by the windings to excite the motor; and when the windings are not being energized, returning at least some of the energy stored in the windings via energy return diodes to the booster. - View Dependent Claims (5, 6, 7, 8, 9, 10)
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11. A unipolar drive, comprising:
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a plurality of windings for a motor; a plurality of first transistors, each transistor coupled to one of the windings and operable to energize the respective winding; a plurality of first diodes, each diode coupled to one of the windings; an energy storage module comprising a first capacitor, a first inductor, and a second diode; and a booster coupled to the first diodes and the second diode, the booster comprising a second transistor, a second capacitor and a second inductor, wherein the booster is operable to receive energy from the windings and the energy storage module using the first diodes and the second diode respectively. - View Dependent Claims (12, 13, 14, 15)
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Specification