Richard E Hartsfield

US Patent:

6359355, Mar 19, 2002

Filed:

Mar 20, 2000

Appl. No.:

09/528829

Inventors:

Richard E. Hartsfield - Chesterfield MO
Michael E. Moore - Princeton IN

Assignee:

Emerson Electric Co. - St. Louis MO

International Classification:

H02K 500

US Classification:

310 89, 310254, 310258

Abstract:

The construction of an electromagnetic device, such as an electric motor, has a segmented stator with a plurality of stator teeth held in a circular pattern solely by a shell of the motor that has been hot dropped over the stator teeth.

US Patent:

20020067092, Jun 6, 2002

Filed:

May 9, 2001

Appl. No.:

09/851865

Inventors:

Alan Crapo - Florissant MO, US
Todd Walls - Rock Hill MO, US
Richard Hartsfield - Chesterfield MO, US
Charles Ketterer - Fenton MO, US
Ken Luca - O'Fallon IL, US

International Classification:

H02K021/12

US Classification:

310/156470

Abstract:

A permanent magnet electric machine with reduced cogging torque includes a plurality of axial rotor sections that are defined on a radially outer surface of a rotor. The axial rotor sections include a set of permanent magnets that are in an unmagnetized state and that have opposite edges that are aligned with an axis of the rotor. The axial rotor sections are rotationally offset such that the edges of the permanent magnets create stair step interfaces. The n sets of permanent magnets are magnetized using a magnetizing fixture. The permanent magnets have a generally rectangular shape and are preferably arc magnets or breadloaf magnets. The conductors of the magnetizing fixture are aligned with the stair step interfaces. A magnetic field induced in the permanent magnets is substantially reduced along the stair step interfaces.

US Patent:

20020093269, Jul 18, 2002

Filed:

Jan 16, 2001

Appl. No.:

09/761125

Inventors:

Bernard Harter - Lynnville IN, US
Richard Hartsfield - Chesterfield MO, US
James Wafer - Belleville IL, US

International Classification:

H02K001/12
H02K001/14

US Classification:

310/254000, 310/216000

Abstract:

A stator for an electric machine such as a motor or a generator includes a plurality of stator segment assemblies. The stator segment assembly includes a stack of stator plates forming a stator segment core. The stator plates include an outer rim section and a tooth section that extends radially inwardly from a center portion of the outer rim section. A radially inner surface of the outer rim section is generally perpendicular to the tooth section. Undercut portions are formed in the radially inner surface of the outer rim section adjacent to the center portion. The undercut portions increase slot area and allow additional winding wire to be wound around the stack. The additional winding wire increases the current carrying capacity of the electric machine through reduced resistance or increased torque per unit volume.

US Patent:

20020101126, Aug 1, 2002

Filed:

Jan 30, 2001

Appl. No.:

09/774214

Inventors:

Alan Crapo - Florissant MO, US
Todd Walls - Rock Hill MO, US
Richard Hartsfield - Chesterfield MO, US

International Classification:

H02K021/16

US Classification:

310/156010, 310/07500R

Abstract:

An electric power steering system for a vehicle includes a steering wheel and a steering shaft that is connected to the steering wheel. A worm gear is connected to the steering shaft. A worm is threadably engaged to the worm gear. A permanent magnet motor is connected to the worm. The permanent magnet motor includes a stator with twelve slots and a rotor with ten poles. The rotor includes one or more axial rotor sections. If more than one axial rotor section is employed, the axial rotor sections are rotationally offset. The axial rotor sections are rotationally offset by an offset angle that is equal to a cogging angle divided by the number of axial rotor sections. The rotor includes breadloaf, spoke, radial or arc permanent magnets.

US Patent:

20030201137, Oct 30, 2003

Filed:

May 7, 2003

Appl. No.:

10/431263

Inventors:

Alan Crapo - Florissant MO, US
Todd Walls - Rock Hill MO, US
Richard Hartsfield - Chesterfield MO, US

International Classification:

B62D005/04

US Classification:

180/444000

Abstract:

An electric power steering system for a vehicle includes a steering wheel and a steering shaft that is connected to the steering wheel. A worm gear is connected to the steering shaft. A worm is threadably engaged to the worm gear. A permanent magnet motor is connected to the worm. The permanent magnet motor includes a stator with twelve slots and a rotor with ten poles. The rotor includes one or more axial rotor sections. If more than one axial rotor section is employed, the axial rotor sections are rotationally offset. The axial rotor sections are rotationally offset by an offset angle that is equal to a cogging angle divided by the number of axial rotor sections. The rotor includes breadloaf, spoke, radial or arc permanent magnets.

US Patent:

20040006865, Jan 15, 2004

Filed:

Jul 11, 2002

Appl. No.:

10/193515

Inventors:

Richard Hartsfield - Chesterfield MO, US
Gary Horst - Manchester MO, US
Dennis Hurst - Florissant MO, US
Kent Sheeran - Festus MO, US

Assignee:

Emerson Electric Co. - St. Louis MO

International Classification:

H02K015/00
H01R043/00
H05K013/00
H02K015/14

US Classification:

029/596000, 029/857000, 029/854000

Abstract:

A method of connecting phases of a segmented stator electric machine includes providing a stator core. An end cap assembly is attached to the stator core. Winding wire is wound around the end cap assembly and the stator core to form a stator segment assembly. A plurality of the stator segment assemblies are assembled into a stator including first, second and third phases. A phase wire stitching machine is used to connect opposite ends of the winding wire of each of the stator segment assemblies to form the first, second and third phases of the stator. The phase wires can be attached to the stator segment assemblies using terminals, IDCs, hook terminals, and/or directly to the winding wire.

US Patent:

20040007934, Jan 15, 2004

Filed:

Jul 11, 2002

Appl. No.:

10/193391

Inventors:

Paul Michaels - St. Louis MO, US
Kent Sheeran - Festus MO, US
Craig Wallace - Brighton IL, US
Daniel Hilton - St. Louis MO, US
Richard Hartsfield - Chesterfield MO, US

Assignee:

Emerson Electric Co. - St. Louis MO

International Classification:

H02K001/12
H02K005/00

US Classification:

310/254000, 310/091000

Abstract:

An interconnecting ring and wire guide for an electric machine includes an annular radial ring having a radially inner edge and a radially outer edge. An axial ring projects axially from the radially inner edge of the annular radial ring. A guide positioner positions the annular radial ring and the axial ring relative to the electric machine. Wire dividers are located on a radially outer surface of the radial ring. The wire dividers include a plurality of circumferential projections that are formed on the radially outer surface of the radial ring. A plurality of wire guides are located adjacent to a radially outer edge of the annular radial ring. Indicia on an outer surface of the annular radial ring identifies at least one of a mounting position for the interconnecting ring and wire guide and a wiring schematic for phases wiring of the electric machine.

US Patent:

20040041483, Mar 4, 2004

Filed:

Aug 28, 2002

Appl. No.:

10/229506

Inventors:

Horst Gary - Manchester MO, US
Richard Hartsfield - Chesterfield MO, US
Mark Carrier - Wildwood MO, US

International Classification:

H02K021/12

US Classification:

310/156080

Abstract:

An interior permanent magnet machine including a rotor stack defining at least two adjacent magnet retention slots and a plurality of permanent magnets positioned within the interior of the rotor, wherein the radial thickness of the rotor that is above a given magnet retention slot transitions from a first radial thickness to a bridge region having a second radial thickness that is less than the first radial thickness. The bridge region is positioned between the two magnet retention slots and the transition to the bridge region occurs within an area falling within a defined angular expanse. Areas of low permeability are positioned below the bridge region between the ends of the adjacent permanent magnets such that (i) there are no direct linear paths between the end edges of the two adjacent magnets that do not pass through an area of low permeability, and (ii) that there are no direct linear paths that extend radially from the outer portion of the rotor to the interior of the rotor, between the permanent magnets, that do not also pass through an area of low permeability.