Hybrid-electric vehicle having a matched reactance machine
First Claim
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1. A hybrid-electric vehicle (HEV) comprising:
- a prime mover;
a matched reactance machine integrated with the prime mover;
a power conditioning unit receiving three-phase power from the matched reactance machine, wherein the power conditioning unit is a three-phase bridge rectifier using six diodes without using semiconductor switches; and
a control unit for controlling a speed of the matched reactance machine to provide a substantially constant terminal voltage for a variable demand level;
wherein;
the matched reactance machine comprises a permanent magnet rotor type machine having a back electromotive force (BEMF) voltage with a line-to-line peak voltage that is equal to a desired terminal voltage of the matched reactance machine at a first finite machine speed; and
the matched reactance machine having an inductance value which allows for a proportional increase in the selected BEMF voltage value throughout a speed range between the first machine speed and a second machine speed which second machine speed is greater than the first speed.
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Abstract
A hybrid-electric vehicle including a matched reactance machine power generation system (MRMPGS). The MRMPGS comprises a permanent magnet rotor type machine having a selected back electromotive force (BEMF) voltage value and a selected machine inductance value. The BEMF voltage value is selected having a line-to-line peak voltage that is equal to a desired terminal voltage of the machine at a first machine speed. The machine inductance value is selected based upon a machine reactance value and a frequency value, which correspond to a proportional increase in the selected BEMF voltage value between the first machine speed and a second machine speed.
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Citations
17 Claims
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1. A hybrid-electric vehicle (HEV) comprising:
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a prime mover; a matched reactance machine integrated with the prime mover; a power conditioning unit receiving three-phase power from the matched reactance machine, wherein the power conditioning unit is a three-phase bridge rectifier using six diodes without using semiconductor switches; and a control unit for controlling a speed of the matched reactance machine to provide a substantially constant terminal voltage for a variable demand level;
wherein;the matched reactance machine comprises a permanent magnet rotor type machine having a back electromotive force (BEMF) voltage with a line-to-line peak voltage that is equal to a desired terminal voltage of the matched reactance machine at a first finite machine speed; and the matched reactance machine having an inductance value which allows for a proportional increase in the selected BEMF voltage value throughout a speed range between the first machine speed and a second machine speed which second machine speed is greater than the first speed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of providing power to a propulsion load of a hybrid-electric vehicle (HEV) comprising:
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providing a turbine engine driven permanent magnet rotor type machine, a battery, a simple three phase rectifier and a propulsion load; coupling the generator to the simple three phase rectifier, and coupling the combination of generator and rectifier in parallel with the battery and the propulsion load; using the generator and battery to provide power to the propulsion load, and the battery to store power produced by the propulsion load; wherein the permanent magnet rotor type machine has a selected back electromotive force (BEMF) voltage value and a selected machine inductance value, wherein an excitation of the machine is fixed and achieved by at least one permanent magnet embedded in a rotor assembly of the machine; wherein the BEMF voltage value is selected at a first machine speed having a line-to-line peak voltage that is equal to a desired terminal voltage of the machine the BEMF value having substantially equal amplitude to the desired terminal voltage at the first speed and wherein an electrical phase difference between the BEMF value and the terminal voltage is approximately zero; wherein the machine inductance value is selected based upon a machine reactance value at a frequency value which correspond to a proportional increase in the selected BEMF voltage value between the first machine speed and a second machine speed which second speed is greater that the first speed, wherein the terminal voltage and a phase current are in phase; and wherein an output voltage of the machine remains substantially constant throughout a speed range between the first speed and the second speed, a machine speed being selected based on a variable power demand level.
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Specification