# US 11,309,774 B2 · Electric motor with busbar unit

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- Number: US 11,309,774 B2
- Document ID: US11309774B2
- Status: Granted
- Kind: B2
- Application number: 16/590,476
- Filed: 2019-10-02
- Published: 2020-07-02
- Granted: 2022-04-19
- Earliest claimed: 2019-01-02
- Assignees: Nidec Corporation
- Applicants: Nidec Corporation
- Inventors: Pascual Guardiola; Thomas Kübler
- Web page: https://patentgrep.com/patent/US11309774B2

## CPC

- H02K 11/40: Structural association with grounding devices
- H02K 3/522: {for generally annular cores with salient poles}
- H02K 2203/09: Machines characterised by wiring elements other than wires, e.g. bus rings, for connecting the winding terminations
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

An electric motor includes a rotor rotatable about a rotation axis, and a stator that externally surrounds the rotor and includes a stator core and coils wound on the stator core. The windings are defined by a winding wire including winding wire end portions that are electrically contacted at end surfaces thereof by busbars held at least partially in a busbar holder, and include a ground contact to connect the stator to a ground potential. The ground contact includes a first end region received in a longitudinal groove on an outside of the stator core.

## Claims

### Claim 1

An electric motor, comprising:
a rotor that is rotatable about a rotation axis; and
a stator that externally surrounds the rotor and includes a stator core and coils wound on the stator core; wherein
the coils are defined by a winding wire including winding wire end portions being electrically contacted at end surfaces thereof by busbars held at least in part in a busbar holder, and including a ground contact to connect the stator to a ground potential; and
the ground contact includes a first end region received in a longitudinal groove on an outside of the stator core.

### Claim 2 (depends on 1)

The electric motor according to claim 1, wherein the ground contact includes a portion of the busbar holder.

### Claim 3 (depends on 1)

The electric motor according to claim 1, wherein the busbar holder is made of an injection molded material, and the ground contact is overmolded by the injection molded material.

### Claim 4 (depends on 1)

The electric motor according to claim 1, wherein the ground contact includes a press-in contact portion including at least one jagged lateral surface in the first end region.

### Claim 5 (depends on 1)

The electric motor according to claim 1, wherein the ground contact includes a portion for rigid connection to a printed circuit board of a controller in a second end region opposite to the first end region.

### Claim 6 (depends on 5)

The electric motor according to claim 5, wherein the portion is a press-fit portion including a press-fit pin.

### Claim 7 (depends on 5)

The electric motor according to claim 5, wherein the first and second end regions of the ground contact are interconnected by a bent portion.

### Claim 8 (depends on 5)

The electric motor according to claim 5, wherein the first and second end regions of the ground contact extend parallel or substantially parallel to a longitudinal axis of the electric motor.

### Claim 9 (depends on 1)

The electric motor according to claim 1, wherein the ground contact includes a guide plate.

### Claim 10 (depends on 1)

The electric motor according to claim 1, wherein the stator core includes a stack of sheets that are electrically insulated from one another in a planar manner, and the ground contact electrically interconnects at least 10% of all of the sheets in the stack of sheets.

### Claim 11 (depends on 1)

The electric motor according to claim 1, wherein the busbar holder is attached to an upper side of the stator.

### Claim 12 (depends on 1)

The electric motor according to claim 1, wherein the coils are surrounded by a positioner on an outside when viewed in the direction of a radius and the busbar holder is held on the positioner.

### Claim 13 (depends on 1)

The electric motor according to claim 1, further comprising a non-conducting motor housing including a plastics material.