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

Patent metadata

Field	Value
Publication number	US-10768028-B2
Application number	US-201515507890-A
Country	US
Kind code	B2
Filing date	Sep 15, 2015
Priority date	Sep 16, 2014
Publication date	Sep 8, 2020
Grant date	Sep 8, 2020

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.

First claim

The invention claimed is:

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.

2. 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.

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

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

5. 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.

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

7. 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.

8. 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.

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

10. 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.

Assignees

• Schaeffler Technologies Ag

Inventors

• Biegert Peter
• Holl Dominik

Classifications

• G01L3/102

  involving magnetostrictive means (magnetostrictive sensors H10N35/101) · CPC title

• F16D25/08

  with fluid-actuated member not rotating with a clutching member (F16D25/02 takes precedence {F16D25/048 takes precedence}) · CPC title

• F16D2300/18

  Sensors; Details or arrangements thereof · CPC title

• G01D5/145 Primary

  influenced by the relative movement between the Hall device and magnetic fields (see G01R33/06) · CPC title

• G01D11/245 Primary

  Housings for sensors · CPC title