# US 2018/0008289 A1 · Surgical motor

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- Number: US 2018/0008289 A1
- Document ID: US20180008289A1
- Status: Published application
- Kind: A1
- Application number: 15/546,581
- Filed: 2016-01-28
- Published: 2018-01-11
- Earliest claimed: 2015-02-02
- Assignees: Aesculap AG
- Applicants: Aesculap AG
- Inventors: Thomas Kahler; Jürgen Barth; Stephanie Auber; Roland-Alois Högerle
- Web page: https://patentgrep.com/patent/US20180008289A1

## CPC

- A61B 17/1628: {Motors; Power supplies}
- H02K 3/47: Air-gap windings, i.e. iron-free windings
- H02K 5/02: Casings or enclosures characterised by the material thereof
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

A coil former for an electric motor, in particular a high-speed surgical motor, in which a rotor is surrounded concentrically by the substantially hollow-cylindrical coil former, carries at least one stator winding. To ensure that as narrow an air gap as possible is permanently maintained between the coil former, which is preferably produced using an injection-molding method often with complex shaping, and a rotor, which runs in the coil former, the coil former is formed either by a non-conductive fully ceramic body, or is in the form of a composite body in which at least one dimension-stabilizing frame element is embedded by injection-molding with plastic in a plastic body which is preferably produced by injection molding.

## Claims

### Claim 1

An electric motor, comprising a rotor which is surrounded concentrically by a substantially hollow-cylindrical coil former which carries at least one stator winding, the coil former being provided with spoke members, ribs and rib extensions for fixing the at least one stator winding in an exactly structured shape, the coil former being in the form of a composite body in which at least one dimension-stabilizing frame element is embedded by injection molding with plastic in a plastic body which is produced by injection molding.

### Claim 2 (depends on 1)

The electric motor according to claim 1, wherein the frame element comprises a sleeve body.

### Claim 3 (depends on 2)

The electric motor according to claim 2, wherein the sleeve body comprises non-conductive material and at least in portions forms a cylindrical inner surface of the coil former.

### Claim 4 (depends on 3)

The electric motor according to claim 3, wherein the sleeve body has a wall thickness which is within a range of from 0.01 to 0.03×D, with D being an inner diameter of the coil former.

### Claim 5 (depends on 4)

The electric motor according to claim 4, wherein the wall thickness of the sleeve body is within a range of from 0.1 to 0.5 mm.

### Claim 6 (depends on 1)

The electric motor according to claim 1, wherein the frame element is formed by a ceramic component.

### Claim 7 (depends on 6)

The electric motor according to claim 6, wherein the ceramic component comprises oxide ceramics.

### Claim 8

A coil former for an electric motor, the electric motor comprising a rotor which is surrounded concentrically by the coil former, the coil former being a substantially hollow-cylindrical coil former having a composite body in which at least one dimension-stabilizing frame element is embedded by injection molding with plastic in a plastic body which is produced by injection molding.

### Claim 9 (depends on 8)

The coil former according to claim 8, wherein the coil former has a complex shape produced by injection molding and having a plurality of fitting surfaces.

### Claim 10 (depends on 8)

The coil former according to claim 8, wherein the frame element comprises a sleeve body.

### Claim 11 (depends on 10)

The coil former according to claim 10, wherein the sleeve body is made of non-conductive material and at least in portions forms a cylindrical inner surface of the coil former.

### Claim 12 (depends on 11)

The coil former according to claim 11, wherein the sleeve body has a wall thickness which is within a range of from 0.01 to 0.03×D, with D being an inner diameter of the coil body.

### Claim 13 (depends on 12)

The coil former according to claim 12, wherein the wall thickness of the sleeve body is within a range of from 0.1 to 0.5 mm.

### Claim 14 (depends on 8)

The coil former according to claim 8, wherein the frame element is formed by a ceramic component.