# US 10,312,776 B2 · Synchronous motor with permanent magnets

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- Number: US 10,312,776 B2
- Document ID: US10312776B2
- Status: Granted
- Kind: B2
- Application number: 13/326,621
- Filed: 2011-12-15
- Published: 2012-06-21
- Granted: 2019-06-04
- Earliest claimed: 2010-12-15
- Assignees: Infranor Holding SA
- Applicants: Giampiero Tassinario; Ivan Flotats; Francesc Cruellas
- Inventors: Giampiero Tassinario; Ivan Flotats; Francesc Cruellas
- Web page: https://patentgrep.com/patent/US10312776B2

## CPC

- H02K 15/24: Shaping or compacting winding heads (H02K15/0428, H02K15/28, H02K15/36 take precedence)
- H02K 3/04: Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K 3/47: Air-gap windings, i.e. iron-free windings
- H02K 1/12: Stationary parts of the magnetic circuit
- H02K 21/00: Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K 21/24: with magnets axially facing the armatures, e.g. hub-type cycle dynamos
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

A synchronous motor with permanent magnets includes a rotor (110) provided with permanent magnets, and a winding (120) formed by overlapping coils located inside a slotless stator (100). The winding coils (120) are regularly distributed all around the 360° of the inside surface of the stator (100) and the ends of the coils are designed such that the winding has the same thickness throughout and the ends of the winding are at least partially inside the slotless stator (100).

## Claims

### Claim 1

A synchronous motor with permanent magnets comprising:
a rotor configured to rotate along a rotation axis provided with permanent magnets; and
a winding of overlapping coils located inside a slotless stator and comprising at least three electrical phases,
wherein the coils of the winding are regularly distributed all around the 360° of the inside surface of the stator,
wherein the coils of the winding comprise first portions having a substantially rectangular section and turn portions, the first portion extending between two opposite turn portions,
wherein the dimensions of the rectangular section of each coil have a width “a” and a thickness “b”, such that the cross-sectional area of the rectangular section is equal to A, wherein A=‘b’בa’,
wherein the turn portions comprise a thickness less than the thickness “b” in the first portions and a cross-sectional area equal to “A”,
wherein the cross-sectional area A of the coils is constant,
wherein the winding has the same radial thickness and a constant cross-section over its length,
wherein only two ends of coils at the turn portions are crossed at a same location, and
wherein the slotless stator extends over the crossing of the coils at ends of the coils.

### Claim 2 (depends on 1)

A synchronous motor according to claim 1, wherein the synchronous motor includes a radial magnetic flux motor provided with a cylindrical rotor, the permanent magnets located on the lateral surface of the rotor, and
wherein the winding is a tubular winding and the stator is a slotless tubular stator.

### Claim 3 (depends on 2)

A synchronous motor according to claim 2, wherein the stator is made from a magnetic wire coiled to produce a tube of the slotless tubular stator.

### Claim 4 (depends on 2)

A synchronous motor according to claim 2, wherein the stator is made from magnetic powder composite or materials capable of being sintered.

### Claim 5 (depends on 1)

A synchronous motor according to claim 1, wherein the stator is made from magnetic steel laminations.

### Claim 6 (depends on 1)

A synchronous motor according to claim 1, wherein the wires of the winding are made of graphene materials.

### Claim 7

An axial magnetic flux motor with permanent magnets disposed along a rotation axis, comprising:
two flat annular stator parts forming a slotless stator;
a disk shaped rotor provided with permanent magnets located inside the two flat annular stator parts; and
two winding, each of which have overlapping coils, distributed around surfaces of the two flat annular stator parts proximal to the disk shape rotor comprising at least three electrical phases,
wherein the coils of the windings comprise first portions having a substantially rectangular section and turn portions, the first portion extending between two opposite turn portions,
wherein the dimensions of the rectangular section of each coil comprise a width “a” and a thickness “b”, such that the cross-sectional area of the rectangular section is equal to A, wherein A=‘b’בa’,
wherein the turn portions comprise a thickness less than the thickness “b” in the first portions and a cross-sectional area equal to “A”,
wherein the cross-sectional area A of the coils is constant,
wherein the winding has the same axial thickness and a constant cross-section over its length, and
wherein only two ends of coils at the turn portions are crossed at a same location, and
wherein the slotless stator extends over the crossing of the coils at ends of the coils.