# US 11,114,906 B2 · Stator in an electric motor

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- Number: US 11,114,906 B2
- Document ID: US11114906B2
- Status: Granted
- Kind: B2
- Application number: 15/970,076
- Filed: 2018-05-03
- Published: 2018-11-08
- Granted: 2021-09-07
- Earliest claimed: 2017-05-05
- Assignees: Bühler Motor GmbH
- Applicants: Bühler Motor GmbH
- Inventors: Jürgen Brettschneider; Richard Guttenberger
- Web page: https://patentgrep.com/patent/US11114906B2

## CPC

- H02K 1/148: {Sectional cores (H02K1/141 takes precedence)}
- H02K 3/30: Windings characterised by the insulating material
- H02K 3/522: {for generally annular cores with salient poles}
- H02K 5/225: {Terminal boxes or connection arrangements (specially adapted for submersible motors H02K5/132)}
- H02K 15/022: with salient poles
- H02K 15/32: Manufacture of terminal arrangements; Connecting the terminals to external circuits
- H02K 15/33: Connecting winding sections; Forming leads; Connecting leads to terminals
- H02K 2211/03: Machines characterised by circuit boards, e.g. pcb
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

A stator in an electric motor and to a method for producing the stator in which a plurality of individual coils are wound on laminated stator poles and are provided with an insulation, wherein the insulation bears connection contacts for bringing the individual coils into contact with a printed circuit board, wherein the connection contacts are press-fitted into the printed circuit board. The present stator provides for a compact size and for simple and economical joining processes. In a preferred embodiment, the electric motor is a dosing pump motor for drug delivery systems.

## Claims

### Claim 1

A stator in an electric dosing pump motor for drug delivery systems, the stator comprising;
a plurality of laminated stator pole cores having first and second ends;
a printed circuit board with contact recesses;
a plurality of individual coils having wire ends, each coil being wound on one of the laminated stator pole cores;
first insulation caps provided at the first end of each stator pole core;
a plurality of the first insulating caps having a star-point baffle and the star-point baffle being positively or non-positively connected to the first insulating caps, wherein, in the contact recesses, the plurality of the first insulating caps are perforated, serrated, or provided with at least one notch;
second insulation caps provided at the second end of each stator pole core;
terminal connection contacts provided on the first insulation caps for bringing the individual coils into contact with the printed circuit board, the wire ends being electrically connected to the terminal contacts, wherein the terminal connection contacts are press-fitted into the contact recesses of the printed circuit board, so that the length tolerance between the first axial end of a stator pole core and one end of the associated terminal contact at the first axial end of the stator pole core is substantially less than the length tolerance of the stator pole core; and
the star-point baffle has balancing bridges with tolerance compensation contours, wherein the length of the balancing bridges along these tolerance compensation contours is greater than the bridged linear distance between adjacent contact points of the winding wire ends at the star-point baffle.

### Claim 2 (depends on 1)

The stator according to claim 1, wherein the length tolerance between a reference plane, which defines the position of the first axial ends of the stator pole cores, and an end of each terminal contact facing the printed circuit board is substantially less than the length tolerance of a stator pole core.

### Claim 3 (depends on 1)

The stator according to claim 1, wherein the terminal contacts with first insulating caps are positively or non-positively connected, wherein the connection contacts are perforated, toothed, or provided with at least one notch.

### Claim 4 (depends on 3)

The stator according to claim 3, wherein the first and second insulating caps accept the stator pole cores in a form-fitting manner.

### Claim 5 (depends on 1)

The stator according to claim 1, wherein the second insulating caps have holding recesses for accepting a retaining means.

### Claim 6 (depends on 1)

The stator according to claim 1, wherein the terminal contacts have a wire connection region and a press-fit region.

### Claim 7 (depends on 1)

The stator according to claim 1, wherein the wire ends of the individual coils are welded, bonded, soldered, or crimped to the terminal contacts to the wire connection region.