Rotor for an electric machine and electric machine having a rotor

Patent metadata

Field	Value
Publication number	US-12021415-B2
Application number	US-202217577477-A
Country	US
Kind code	B2
Filing date	Jan 18, 2022
Priority date	Feb 19, 2021
Publication date	Jun 25, 2024
Grant date	Jun 25, 2024

Abstract

A rotor (1) for an electric machine (2) has a rotor body including multiple poles. The rotor (1) further has at least one sensor element (3) for detecting at least one condition variable of the rotor (1), and a signal processing unit (4) connected to the at least one sensor element (3). The signal processing unit (4) is configured to generate measured data from the condition variable of the rotor (1) and to transmit the measured data to a control device (5). Additionally, the rotor (1) has at least one induction coil (7), where each of the at least one induction coil (7) includes at least one electrical conductor (8). The at least one induction coil (7) is arranged at the rotor (1) and is configured to generate electrical energy from a magnetic field that is temporally changing during operation of the electric machine (2).

First claim

The invention claimed is:

1. A rotor ( 1 ) for an electric machine ( 2 ), comprising:
a rotor body including multiple poles;
at least one sensor element ( 3 ) for detecting at least one condition variable of the rotor ( 1 );
a signal processing unit ( 4 ) connected to the at least one sensor element ( 3 ), the signal processing unit ( 4 ) being configured to generate measured data from the condition variable of the rotor ( 1 ) and to transmit the measured data to a control device ( 5 ); and
at least one induction coil ( 7 ), each of the at least one induction coil ( 7 ) includes at least one electrical conductor ( 8 ), the at least one induction coil ( 7 ) being arranged at the rotor ( 1 ) on an outer circumferential surface ( 12 ) of the rotor ( 1 ) and being configured to supply electrical energy to power one or both of the signal processing unit ( 4 ) and the at least one sensor element ( 3 ) from a magnetic field that is temporally changing during operation of the electric machine ( 2 ).

2. The rotor ( 1 ) of claim 1 , wherein the at least one electrical conductor ( 8 ) of the at least one induction coil ( 7 ) extends in a first direction in a first area ( 9 . 1 ) of the rotor ( 1 ) and extends back from the first direction in a second area ( 9 . 2 ) of the rotor ( 1 ).

3. The rotor ( 1 ) of claim 1 , wherein the at least one induction coil ( 7 ) is on a circuit board ( 10 ).

4. The rotor ( 1 ) of claim 3 , wherein the circuit board ( 10 ) is flexible.

5. The rotor ( 1 ) of claim 3 , wherein the circuit board ( 10 ) is on the outer circumferential surface ( 12 ) of the rotor ( 1 ).

6. The rotor ( 1 ) of claim 3 , wherein the circuit board ( 10 ) and the at least one induction coil ( 7 ) are received in a slot ( 23 ) defined in the rotor ( 1 ).

7. The rotor ( 1 ) of claim 1 , wherein the at least one induction coil ( 7 ) is received in an indentation ( 16 ) defined in the outer circumferential surface ( 12 ) of the rotor ( 1 ).

8. The rotor ( 1 ) of claim 1 , wherein the at least one induction coil ( 7 ) is fixed on the outer circumferential surface ( 12 ) of the rotor ( 1 ) by one or both of adhesive and a binding band ( 22 ).

9. The rotor ( 1 ) of claim 1 , wherein the at least one induction coil ( 7 ) is between two of the multiple poles or on an axis that extends through one of the multiple poles.

10. The rotor ( 1 ) of claim 1 , wherein the signal processing unit ( 4 ) is on an end face of the rotor ( 1 ).

11. The rotor ( 1 ) of claim 1 , further comprising at least one permanent magnet ( 15 . 1 , 15 . 2 ) proximate each of the multiple poles of the rotor ( 1 ).

12. An electric machine ( 2 ), comprising:
a control device ( 5 ) for open-loop control of the electric machine ( 2 );
a stator ( 11 ); and
the rotor ( 1 ) of claim 1 .

13. A rotor ( 1 ) for an electric machine ( 2 ), comprising:
a rotor body including multiple poles;
a rotor shaft extending along an axial direction, the rotor body being fixed to the rotor shaft for rotation with the rotor shaft about the axial direction;
at least one sensor element ( 3 ) for detecting at least one condition variable of the rotor ( 1 );
a signal processing unit ( 4 ) connected to the at least one sensor element ( 3 ), the signal processing unit ( 4 ) being configured to generate measured data from the condition variable of the rotor ( 1 ) and to transmit the measured data to a control device ( 5 ); and
at least one induction coil ( 7 ), each of the at least one induction coil ( 7 ) includes at least one electrical conductor ( 8 ), the at least one induction coil ( 7 ) being arranged at the rotor ( 1 ) and being configured to supply electrical energy to power one or both of the signal processing unit ( 4 ) and the at least one sensor element ( 3 ) from a magnetic field that is temporally changing during operation of the electric machine ( 2 ), the at least one induction coil ( 7 ) extending at least partially along the axial direction.

14. The rotor ( 1 ) of claim 13 , wherein the at least one electrical conductor ( 8 ) of the at least one induction coil ( 7 ) extends in a first direction in a first area ( 9 . 1 ) of the rotor ( 1 ) and extends back from the first direction in a second area ( 9 . 2 ) of the rotor ( 1 ).

15. The rotor ( 1 ) of claim 13 , further comprising at least one core ( 24 ), each of the at least one induction coil ( 7 ) being wound around a respective one of the at least one core ( 24 ),
wherein a recess ( 25 ) is defined in the rotor ( 1 ) for accommodating each of the at least one induction coil ( 7 ) and the respective one of the at least one core ( 24 ), each recess ( 25 ) extending in the axial direction.

16. The rotor ( 1 ) of claim 15 , wherein each of the at least one core ( 24 ) comprises a plurality of axially stacked sheet-metal elements.

17. An electric machine ( 2 ), comprising:
a control device ( 5 ) for open-loop control of the electric machine ( 2 );
a stator ( 11 ); and
the rotor ( 1 ) of claim 13 .

Assignees

• Zahnradfabrik Friedrichshafen

Inventors

• Eggler Jochen
• Kehr Ulrich

Classifications

• H02P6/21

  Open loop start · CPC title

• H02P29/66

  Controlling or determining the temperature of the rotor · CPC title

• H02P1/445

  by using additional capacitors switched at start up · CPC title

• H02K11/35

  Devices for recording or transmitting machine parameters, e.g. memory chips or radio transmitters for diagnosis · CPC title

• H02K11/0094

  Structural association with other electrical or electronic devices · CPC title