Power system and method for driving an electromotive traction system and auxiliary equipment through a common power bus
First Claim
1. A power system comprising:
- a power source;
a power bus coupled to receive electrical power from the power source;
a traction system coupled to the power bus, wherein the traction system comprises at least one electromotive machine having a first type of stator winding configured to provide a level of protection relative to voltage spikes expected at the traction stator under a first voltage level appropriate for the traction system;
inverter circuitry coupled to draw electrical power from the bus to drive auxiliary equipment comprising at least one electromotive machine having a second type of stator winding configured to provide a level of protection relative to voltage spikes expected at the auxiliary stator under a second voltage level, wherein the second voltage level is lower than the first voltage level; and
signal-conditioning circuitry coupled to attenuate repetitive voltage spikes produced by the inverter circuitry, wherein the power bus is operated at the first voltage level, and further wherein the voltage spike attenuation is sufficient to protect the auxiliary stator notwithstanding of operation of the power bus at the first voltage level, wherein the signal-conditioning circuitry comprises a filter, wherein the filter comprises a resistor/inductor/capacitor-based filter arranged in a Y-circuit topology, wherein each branch of the Y-circuit comprises a respective resistor, inductor and capacitor connected in series circuit.
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Accused Products
Abstract
Power system and method for providing electrical power are provided. The system includes a traction system and auxiliary equipment coupled to a power bus. The traction system includes one or more electromotive machines having a first type of stator winding that provides protection relative to voltage spikes expected at the traction stator under a first voltage level appropriate for the traction system. The auxiliary equipment includes one or more electromotive machines having a second type of stator winding that provides protection relative to spikes expected at the auxiliary stator under a second voltage level lower than the first voltage level. Inverter circuitry is coupled to drive the auxiliary equipment, and signal-conditioning circuitry is provided to attenuate voltage spikes produced by the inverter circuitry. The power bus is operated at the first voltage level, and the voltage spike attenuation is sufficient to protect the auxiliary stator.
41 Citations
16 Claims
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1. A power system comprising:
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a power source; a power bus coupled to receive electrical power from the power source; a traction system coupled to the power bus, wherein the traction system comprises at least one electromotive machine having a first type of stator winding configured to provide a level of protection relative to voltage spikes expected at the traction stator under a first voltage level appropriate for the traction system; inverter circuitry coupled to draw electrical power from the bus to drive auxiliary equipment comprising at least one electromotive machine having a second type of stator winding configured to provide a level of protection relative to voltage spikes expected at the auxiliary stator under a second voltage level, wherein the second voltage level is lower than the first voltage level; and signal-conditioning circuitry coupled to attenuate repetitive voltage spikes produced by the inverter circuitry, wherein the power bus is operated at the first voltage level, and further wherein the voltage spike attenuation is sufficient to protect the auxiliary stator notwithstanding of operation of the power bus at the first voltage level, wherein the signal-conditioning circuitry comprises a filter, wherein the filter comprises a resistor/inductor/capacitor-based filter arranged in a Y-circuit topology, wherein each branch of the Y-circuit comprises a respective resistor, inductor and capacitor connected in series circuit. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A power system comprising:
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a power source; a power bus coupled to receive electrical power from the power source; a traction system coupled to the power bus, wherein the traction system comprises at least one electromotive machine having a first type of stator winding configured to provide a level of protection relative to voltage spikes expected at the traction stator under a first voltage level appropriate for the traction system; inverter circuitry coupled to draw electrical power from the bus to drive auxiliary equipment comprising at least one electromotive machine having a second type of stator winding configured to provide a level of protection relative to voltage spikes expected at the auxiliary stator under a second voltage level, wherein the second voltage level is lower than the first voltage level; and signal-conditioning circuitry coupled to attenuate repetitive voltage spikes produced by the inverter circuitry, wherein the power bus is operated at the first voltage level, and further wherein the voltage spike attenuation is sufficient to protect the auxiliary stator notwithstanding of operation of the power bus at the first voltage level, wherein the signal-conditioning circuitry comprises a filter, wherein the filter comprises a resistor/capacitor-based low-pass filter, wherein said filter is further based on inductance and is arranged in a Y-circuit topology, wherein each branch of the Y-circuit comprises a respective resistor and inductor connected in parallel circuit and further comprises a capacitor connected in series circuit to the parallel circuit. - View Dependent Claims (8, 9)
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10. A power system comprising:
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a power source; a power bus coupled to receive electrical power from the power source; a traction system coupled to the power bus, wherein the traction system comprises at least one electromotive machine having a first type of stator winding configured to provide a level of protection relative to voltage spikes expected at the traction stator under a first voltage level appropriate for the traction system; inverter circuitry coupled to draw electrical power from the bus to drive auxiliary equipment comprising at least one electromotive machine having a second type of stator winding configured to provide a level of protection relative to voltage spikes expected at the auxiliary stator under a second voltage level, wherein the second voltage level is lower than the first voltage level; and signal-conditioning circuitry coupled to attenuate repetitive voltage spikes produced by the inverter circuitry, bus is operated at the first voltage level, and further wherein the voltage spike attenuation is sufficient to protect the auxiliary stator notwithstanding of operation of the power bus at the first voltage level, wherein the signal-conditioning circuitry comprises a filter, wherein the filter comprises a resistor/capacitor-based low-pass filter, wherein a line separation from an output side of a given inverter circuitry to an input side of a given auxiliary load comprises a first distance, and further wherein said filter is located in a range from the input side of the auxiliary load to a second distance upstream from the auxiliary load, wherein the second distance is half the first distance.
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11. A method for arranging and operating a powered system comprising:
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coupling a power bus to receive electrical power from a power source; coupling a traction system to the power bus, wherein the traction system comprises at least one electromotive machine having a first type of stator winding configured to provide a level of protection relative to voltage spikes expected at the traction stator under a first voltage level appropriate for the traction system; drawing power from the power bus through inverter circuitry coupled to drive auxiliary equipment comprising coupling auxiliary equipment to the power bus wherein the auxiliary equipment comprises at least one electromotive machine having a second type of stator winding configured to provide a level of protection relative to voltage spikes expected at the auxiliary stator under a second voltage level, wherein the second voltage level is lower than the first voltage level; operating the power bus at the first voltage level; and conditioning signals from the inverter circuitry to the auxiliary equipment to attenuate voltage spikes produced by the inverter circuitry, wherein the voltage spike attenuation is sufficient to protect the auxiliary stator notwithstanding of operating the power bus at the first voltage level, wherein the signal conditioning comprises filtering the signals from the inverter circuitry to the auxiliary equipment, wherein a line separation from an output side of the inverter circuitry to an input side of the auxiliary load comprises a first distance, and wherein the method further comprises defining a first filter topology to be located in a range from the output side of the inverter circuitry to a second distance downstream from the inverter circuitry, wherein the second distance is half the first distance. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification