US 7,710,081 B2Granted

Electromechanical energy conversion systems

AssigneeDirect Drive Systems, Inc.

InventorsDaniel M. Saban, Raed H. Ahmad, Zhiguo Pan

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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.

Claims23

Dependent claims

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.

3 more elements

A method for providing for electromechanical energy conversion, the method comprising:

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.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/751,450Filed 21 May 2007 · us provisional application
Priority: 27 Oct 2006
Published: US 2008/0103632 A11 May 2008
Granted: 4 May 2010
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

H02K 3/28
Windings characterised by the conductor shape, form or construction, e.g. with bar conductors: layout of windings or of connections between windings
H02K 11/33
Structural association with control circuits or drive circuits: drive circuits, e.g. power electronics
H02K 21/48
Synchronous motors having permanent magnets; Synchronous generators having permanent magnets: generators with two or more outputs
H02P 29/50
Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors: reduction of harmonics

Family

Application60/863,233Us provisional application · filed 27 Oct 2006
Application60/864,882Us provisional application · filed 8 Nov 2006
Application60/895,025Us provisional application · filed 15 Mar 2007
US 2008/0103632 A1Pre-grant publication · published 1 May 2008
US 7,710,081 B2This patent

From the US filing history. Foreign family members aren’t listed.