Electric motor comprising an integrated rotary encoder
An electric motor has an end shield and a sensor for detecting a magnetic field. The sensor is integrated into the end shield of the electric motor. An electric drive unit may include a brake, in particular an electromagnetically actuatable brake, and an electric motor, where a shielding element is arranged between the sensor and the brake.
1. An electric drive unit, comprising:
a brake;
an electric motor having an end shield and having a sensor that senses a magnetic field and is integrated into the end shield of the electric motor; and
a shielding element arranged between the sensor and the brake, wherein a surface of the shielding element that faces toward the brake forms a friction surface of the brake.
2. The electric motor as claimed in claim 1 , wherein the electric motor has an encoder element, connected in a rotationally fixed manner to a shaft of the electric motor, for generating a magnetic field that can be sensed by the sensor.
3. The electric motor as claimed in claim 2 , wherein the encoder element is arranged, in a direction parallel to an axis of the electric motor, in a region of the end shield.
4. The electric motor as claimed in claim 3 , wherein the encoder element is arranged between a bearing of the motor supported by the end shield and a shielding element.
5. The electric motor as claimed in claim 1 , wherein the shielding element magnetically shields the sensor against a magnetic field acting externally on the electric motor.
6. The electric motor as claimed in claim 1 , wherein the end shield has a seating surface for supporting the shielding element in a direction parallel to the electric motor.
7. The electric motor as claimed in claim 6 , wherein the seating surface is for taking a mechanical force applied to the shielding element.
8. The electric motor as claimed in claim 1 , wherein the end shield has a recess for receiving the sensor and/or a recess for receiving a cable connected to the sensor.
9. The electric motor as claimed in claim 8 , wherein the recess for receiving the sensor and/or the recess for receiving a cable connected to the sensor is set back from a seating surface in a direction parallel to an axis of the electric motor, and/or forms a depression in the seating surface.
10. The electric motor as claimed in claim 1 , wherein the end shield is a cast part.
11. The electric motor as claimed in claim 10 , wherein a recess for receiving a cable, a recess for receiving the sensor and/or a receiver for a strain relief element for the cable are formed into the end shield by casting.
12. The electric motor as claimed in claim 1 , wherein the shielding element includes a shielding plate.
13. The electric drive unit as claimed in claim 1 , wherein the brake is electromagnetically actuated.