Three-Dimensional-Flux Electric Motor And Method For Making Thereof

Patent metadata

Field	Value
Publication number	US-2025357801-A1
Application number	US-202519206386-A
Country	US
Kind code	A1
Filing date	May 13, 2025
Priority date	May 14, 2024
Publication date	Nov 20, 2025
Grant date	—

Abstract

A stator for an axial flux motor includes: a yoke, a plurality of teeth arranged on the yoke and spaced from each other, each tooth of the plurality of teeth including a sprayed soft-magnetic composite material including a matrix of ferro-magnetic domains separated by insulation layers, and a coil over each tooth, the coil over each tooth being connected to coils on adjacent teeth. Each tooth of the plurality of teeth includes a body portion having three sides, each of the three sides having a bottom edge and a top edge, and a top portion located on the top edges. The top portion includes an overhang portion that overhangs the top edges of the body portion. Each tooth of the plurality of teeth provides for a magnetic flux flow in the spray-formed composite material in axial, radial, and circumferential directions.

First claim

What is claimed is:

1 . A stator for an axial flux motor, the stator comprising:
a yoke, a plurality of teeth arranged on the yoke and spaced from each other, each tooth of the plurality of teeth comprising a sprayed soft-magnetic composite material comprising a matrix of ferro-magnetic domains separated by insulation layers, and a prefabricated coil over each tooth, the coil over each tooth being connected to coils on adjacent teeth, wherein each tooth of the plurality of teeth includes a body portion having three sides, each of the three sides having a bottom edge and a top edge, and a top portion located on the top edges, wherein the top portion includes an overhang portion that overhangs the top edges of the body portion, and wherein each tooth of the plurality of teeth provides for a magnetic flux flow in the spray-formed composite material in axial, radial, and circumferential directions.

2 . The stator of claim 1 , wherein the matrix of ferro-magnetic domains separated by insulation layers is formed from particles of a powder, wherein a particle of the powder comprises a core-shell structure having a core of ferro-magnetic material covered by a shell of insulating material reactively formed with the ferro-magnetic material.

3 . The stator of claim 2 , wherein the core of ferro-magnetic material comprises at least one of iron, cobalt, or nickel, and wherein the shell of insulating material comprises a ceramic.

1 . The stator of claim 2 , wherein the core-shell structures are from 50 micrometers to 100 micrometers in diameter, and wherein the shell of insulating material is 100 nanometers to 150 nanometers in thickness.

2 . The stator of claim 1 , wherein the soft-magnetic composite material is configured to be sprayed using a high velocity air fuel system or a high velocity oxy-fuel system.

3 . The stator of claim 1 , wherein the matrix of ferro-magnetic domains separated by insulation layers comprises a plurality of the ferro-magnetic domains separated by the insulation layers mechanically interlocked and held in compression.

4 . The stator of claim 1 , wherein a density of the matrix of ferro-magnetic domains separated by insulation layers is between 6000 and 7000 kilograms per cubic meter.

5 . The stator of claim 1 , wherein the plurality of teeth arranged on the yoke and spaced from each other are formed from a spray-formed tooth ring, the spray-formed tooth ring being spray-formed in a near-net manner.

6 . A method of making a stator for an axial flux flow motor, the method comprising:
providing a yoke; spray-forming a tooth ring as a sprayed soft-magnetic composite material comprising a matrix of ferro-magnetic domains separated by insulation layers; separating portions of the tooth ring to form a plurality of teeth; arranging the separated teeth in a circular pattern, wherein each separated tooth is spaced from an adjacent tooth; inserting a prefabricated coil over each separated tooth, wherein the coil comprises two lead wires extending from a same face of each coil; locating the yoke onto the plurality of teeth; placing a housing onto the yoke; and connecting the coils to each other at the two lead wires extending from the same face of each coil.

7 . The method of claim 9 , wherein spray-forming the tooth ring comprises spraying particles of a powder using a high velocity air fuel system or a high velocity oxy-fuel system, wherein a particle of the powder comprises a core-shell structure having a core of ferro-magnetic material covered by a shell of insulating material reactively formed with the ferro-magnetic material.

8 . The method of claim 10 , wherein spray-forming the tooth ring comprises spraying particles of the powder using a high velocity air fuel system or a high velocity oxy-fuel system comprises heating the particles of the powder to a temperature sufficient to soften the core of ferro-magnetic material.

9 . The method of claim 11 , wherein spray-forming the tooth ring comprises spraying the heated particles of the powder at a speed sufficient to cause the heated particles to bind together.

10 . The method of claim 9 , wherein spray-forming the tooth ring causes the ferro-magnetic domains and insulation layers separating the ferro-magnetic domains to mechanically interlock and be held in compression.

11 . The method of claim 9 , wherein spray-forming the tooth ring comprises spray-forming the sprayed soft-magnetic composite material comprising a matrix of ferro-magnetic domains separated by insulation layers in a near-net shape manner.

12 . The method of claim 9 , wherein spray-forming the tooth ring comprises spraying the soft-magnetic composite material in a radial pattern onto a spinning target.

13 . The method of claim 10 , further comprising regulating a temperature of the sprayed soft-magnetic composite material to minimize fracturing of the shell of insulating material.

14 . A method of forming a motor component in a near-net manner, the method comprising:
providing a mold as a target, the mold having a cavity defined therein; spinning the mold about an axis extending through a center of the mold; translating a spray gun of a spray-deposition system in a radial direction relative to the axis; spraying, from the spray-deposition system, a beam of soft-magnetic composite material comprising particles having a core-shell structure, onto the mold; angling the beam of sprayed soft-magnetic composite material at an inside corner defined by at least two walls of the mold; and removing the motor component formed by the sprayed soft-magnetic composite material from the mold.

15 . The method of claim 17 , further comprising machining the inside corner defined by the at least two walls of the mold to reduce a radii or a chamfered surface.

16 . The method of claim 17 , further comprising grit blasting a surface of the mold.

17 . The method of claim 17 , further comprising sanding a surface of the mold.

18 . The method of claim 17 , wherein removing the motor component formed by the sprayed soft-magnetic composite material from the mold comprises shearing the mold off of the motor component.

19 . The method of claim 17 , wherein removing the motor component formed by the sprayed soft-magnetic composite material from the mold comprises cutting the motor component from the mold.

20 . The method of claim 17 , wherein removing the motor component formed by the sprayed soft-magnetic composite material from the mold comprises heating the mold.

21 . An axial flux motor, comprising:
a housing comprising a bearing sleeve axially positioned in the housing; at least one stator mounted on the bearing sleeve, the at least one stator comprising,
a spray-formed stator yoke,
a plurality of teeth arranged on the spray-formed stator yoke and spaced from each other, each tooth of the plurality of teeth comprising a sprayed soft-magnetic composite material comprising a matrix of ferro-magnetic domains separated by insulation layers, and
a coil over each tooth, the coil over each tooth being connected to coils on adjacent teeth,
wherein each tooth of the plurality of teeth includes a body portion having three sides, each of the three sides having a bottom edge and a top edge, and a top portion located on the top edges,
wherein the top portion includes an overhang portion that overhangs the top edges of the body portion, and
wherein each tooth of the plurality

Assignees

• Persimmon Tech Corporation

Inventors

• Krishnasamy Jayaraman
• Hosek Martin
• Taghavi Morteza
• Guralnick Brett
• Gupta Ankur
• Talmer Mark

Classifications

• H02K1/148

  Sectional cores (H02K1/141 takes precedence) · CPC title

• H02K15/12

  Impregnating, moulding insulation, heating or drying of windings, stators, rotors or machines · CPC title

• H02K1/146

  consisting of a generally annular yoke with salient poles · CPC title

• H02K21/24

  with magnets axially facing the armatures, e.g. hub-type cycle dynamos · CPC title

• H02K1/02 Primary

  characterised by the magnetic material · CPC title