ELECTROMECHANICAL ENERGY CONVERSION SYSTEMS
First Claim
1. An energy processing system comprising:
- an electric machine that comprises;
a stator with a plurality of winding locations distributed substantially evenly across a surface of the stator; and
a plurality of conductors formed into a plurality of coils arranged substantially symmetrically among the plurality of winding locations and connected to form a number (N) of sets of multiple (M) phase windings, wherein for each of the windings, each of the coils spans a single pole to form a full pitch winding, and wherein each of the N sets of windings are substantially offset with respect to each other so as to substantially reduce a harmonic content of a magnetic flux within a first frequency range during operation; and
a processing stage that comprises N substantially independent modules corresponding to each of the N sets of windings, each of the N modules having M input ports for connection to each of the corresponding M windings, and having a first and a second output port, wherein the first and second outputs ports for each of the N modules are connectable to a first node and a second node of a voltage bus.
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Accused Products
Abstract
An exemplary power system may include an electric machine with multiple sets of stator windings, each set of windings being coupled through a separate switch matrix to a common voltage bus, and each of which may be spatially arranged in full pitch around the stator such that stator flux harmonics are substantially reduced. The reduced stator flux harmonics may be associated with phase current harmonic content. In an example application, such power systems may operate in a generating mode to transfer mechanical energy to electrical energy on a DC voltage bus. In some illustrative embodiments, the power system may provide both high-power and high-speed (e.g., 1 MW at 8000 rpm or above) motoring and/or generating capability suitable, for example, for on-board (e.g., marine, aviation, traction) power systems.
239 Citations
21 Claims
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1. An energy processing system comprising:
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an electric machine that comprises; a stator with a plurality of winding locations distributed substantially evenly across a surface of the stator; and a plurality of conductors formed into a plurality of coils arranged substantially symmetrically among the plurality of winding locations and connected to form a number (N) of sets of multiple (M) phase windings, wherein for each of the windings, each of the coils spans a single pole to form a full pitch winding, and wherein each of the N sets of windings are substantially offset with respect to each other so as to substantially reduce a harmonic content of a magnetic flux within a first frequency range during operation; and a processing stage that comprises N substantially independent modules corresponding to each of the N sets of windings, each of the N modules having M input ports for connection to each of the corresponding M windings, and having a first and a second output port, wherein the first and second outputs ports for each of the N modules are connectable to a first node and a second node of a voltage bus. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for providing for electromechanical energy conversion, the method comprising:
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providing an electric machine that comprises; a stator with a series of tooth structures separated by a corresponding plurality of slots; and a plurality of conductors formed into a plurality of coils arranged substantially symmetrically in the plurality of slots and connected to form a number (N) of sets of multiple (M) phase windings, wherein for each of the windings, each of the coils spans a single pole to form a full pitch winding, and wherein each of the N sets of windings are substantially offset with respect to each other so as to substantially reduce a harmonic content of a magnetic flux within a first frequency range during operation; and processing energy between the electric machine and a voltage bus using a processing stage that comprises N substantially independent modules corresponding to each of the N sets of windings, each of the N modules having M input ports for connection to each of the corresponding M windings, and having a first and a second output port, wherein the first and second outputs ports for each of the N modules are connectable to a first node and a second node of the voltage bus. - View Dependent Claims (20, 21)
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Specification