Electromechanical energy conversion systems
First Claim
1. A 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 defining 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 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 plurality of switch matrices configured to provide electrical power to the N sets of windings during operation.
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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.
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Citations
31 Claims
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1. A 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 defining 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 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 plurality of switch matrices configured to provide electrical power to the N sets of windings during operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for providing for providing mechanical energy conversion, comprising:
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providing 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 defining 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 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 operating the electric machine. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A 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 defining 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 offset with respect to each other so as to 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 coupled to the N sets of windings. - View Dependent Claims (21, 22, 23, 24, 25, 26)
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27. A method comprising:
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providing an electric machine that comprises; a stator with a plurality of winding locations distributed substantially evenly across a surface of the stator; a plurality of conductors defining a plurality of coils arranged substantially symmetrically among the plurality of winding locations and connected to form windings; and a plurality of switch matrices configured to provide electrical power to the windings; and operating the electric machine at a fundamental electrical frequency of the electric machine by switching the switch matrices at a switching frequency substantially equal to the fundamental electrical frequency. - View Dependent Claims (28, 29, 30, 31)
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Specification