# US 10,768,028 B2 · Sensor unit for determining a rotor position of an electric motor and electric motor, preferably for a clutch actuator of a clutch actuation system of a motor vehicle

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- Number: US 10,768,028 B2
- Document ID: US10768028B2
- Status: Granted
- Kind: B2
- Application number: 15/507,890
- Filed: 2015-09-15
- Published: 2017-09-14
- Granted: 2020-09-08
- Earliest claimed: 2014-09-16
- Assignees: Schaeffler Technologies AG & Co. KG
- Applicants: Schaeffler Technologies AG & Co. KG
- Inventors: Peter Biegert; Dominik Holl
- Web page: https://patentgrep.com/patent/US10768028B2

## CPC

- G01D 11/245: {Housings for sensors}
- F16D 25/08: with fluid-actuated member not rotating with a clutching member (F16D25/02 takes precedence {F16D25/048 takes precedence})
- G01D 5/145: {influenced by the relative movement between the Hall device and magnetic fields (see G01R33/06)}
- F16D 28/00: Electrically-actuated clutches (arrangements for synchronisation F16D23/02; clutches actuated directly by means of an electromagnet F16D27/00; automatic clutches F16D43/00 - F16D45/00; external control F16D48/00)
- F16D 2025/081: {Hydraulic devices that initiate movement of pistons in secondary cylinders for actuating clutches, i.e. primary cylinders}
- F16D 2300/18: Sensors; Details or arrangements thereof
- F16D 2500/302: from the actuator
- F16D 2500/5122: Improve passengers comfort
- G01L 3/102: {involving magnetostrictive means (magnetostrictive sensors H10N35/101)}
- G01D: MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- G01L: MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE (weighing G01G)

## Abstract

The invention relates to a sensor unit for determining a rotor position of an electric motor, including at least one magnetic field sensor attached to a carrier element. In the case of a sensor unit, in which the sensor system can be easily exchanged, the carrier element is positioned in a sensor system housing which is open on one side and in which a sensing area of the at least one magnetic field sensor is directed in the direction of the open side of the sensor system housing.

## Claims

### Claim 1

An electric motor assembly comprising:
a sensor unit for determining a rotor position of an electric motor, the sensor unit including:
at least one magnetic field sensor, which is fastened on a carrier element,
the carrier element is positioned in a sensor housing, the sensor housing having a cylindrical profile, the sensor housing being open at one side and the at least one magnetic field sensor is positioned inside of the sensor housing and in a direction of the one side of the sensor housing that is open,
the sensor housing has a step in an axial direction thereof by which the sensor housing is divided into two portions with two-cross sections having different outer diameters and the at least one magnetic field sensor is partially arranged in both of the two portions, wherein a circumferential surface of the sensor housing includes a protruding locking mechanism,
a rotor, which is directly connected to a magnet, and
a stator, at which the at least one magnetic field sensor is arranged for detecting a magnetic field extending from the magnet outside an axis of rotation of the rotor.

### Claim 2 (depends on 1)

The electric motor assembly according to claim 1, wherein the sensor unit is arranged at the stator, with an open side of the sensor housing facing the magnet.

### Claim 3 (depends on 1)

The electric motor assembly according to claim 1, wherein the sensor housing is pluggable onto a housing of the rotor.

### Claim 4 (depends on 1)

The electric motor assembly according to claim 1, wherein the electric motor is part of a clutch actuating system for a motor vehicle.

### Claim 5 (depends on 1)

The electric motor assembly according to claim 1, wherein the sensor housing tapers to a smaller diameter in the direction of the one side of the sensor housing that is open.

### Claim 6 (depends on 1)

The electric motor assembly according to claim 1, wherein the carrier element comprises a circuit board or as a leadframe.

### Claim 7 (depends on 6)

The electric motor assembly according to claim 6, wherein the carrier element is molded or injection molded with a synthetic material in the sensor housing.

### Claim 8 (depends on 1)

The electric motor assembly according to claim 1, wherein at least one of wiring of the carrier element or wiring of the at least one magnetic field sensor are guided in a cable outlet, which projects from the sensor housing, with the cable outlet being filled with a synthetic material.

### Claim 9 (depends on 1)

The electric motor assembly according to claim 1, wherein the sensor housing has at an exterior circumference thereof at least one gasket.

### Claim 10 (depends on 1)

The electric motor assembly according to claim 1, wherein the carrier element is equipped at both sides with at least one of the at least one magnetic field sensor or an electronic evaluation unit or an amplification electronics.