Electrical radial flow machine and powertrain

Patent metadata

Field	Value
Publication number	US-12362639-B2
Application number	US-202118007525-A
Country	US
Kind code	B2
Filing date	May 3, 2021
Priority date	Jun 4, 2020
Publication date	Jul 15, 2025
Grant date	Jul 15, 2025

Abstract

An electric radial flow machine having a stator, a rotor body connected to a rotor shaft, and a spring element which applies a spring force to the rotor body in the axial direction such that in a first operating position, the rotor body is held in an axial position in which the overlap between opposing surfaces of the rotor body and the stator is less than 100%. A displacement device with first and second displacement elements generates an axial movement between the rotor body and the stator against the spring force using a torque produced between the rotor shaft and the rotor body so that in the event of a rotation of the first displacement element relative to the second displacement element or vice versa, the rotor body is pushed on the rotor shaft axially against the spring force.

First claim

The invention claimed is:

1. An electric radial flow machine formed as a permanently excited synchronous machine, comprising:
a stator;
a rotor body connected to a rotor shaft;
a spring element which applies a spring force to the rotor body in an axial direction such that in a first operating position, the rotor body is held in an axial position in which an overlap between opposing surfaces of the rotor body and the stator is less than 100%;
at least one displacement device configured to generate an axial movement between the rotor body and the stator based on a torque produced between the rotor shaft and the rotor body against the spring force;
the at least one displacement device has a first displacement element, a second displacement element, and at least one rolling element arranged between the first displacement element and the second displacement element;
the first displacement element is connected to the rotor body and is axially slidable and rotatable at least in certain areas on the rotor shaft, which is arranged so that the rotor shaft cannot be slid axially;
the second displacement element is connected to the rotor shaft in a rotationally and slidably fixed manner;
the first displacement element on a side facing the second displacement element has a first ramp element and the second displacement element has a second ramp element on a side thereof facing the first displacement element; and
the first ramp element and the second ramp element are configured such that upon a rotation of the first displacement element relative to the second displacement element or vice versa, the rotor body is pushed on the rotor shaft axially against the spring force.

2. The radial flow machine according to claim 1 , wherein the spring element is dimensioned with the spring force such that, when the radial flow machine is at rest, the rotor body and the stator are spaced apart by the spring force when overcoming a magnetic attraction force existing between the rotor body and the stator by a predetermined maximum axial distance d from one another, and the distance d is dimensioned such that the overlap of the opposing surfaces of the rotor body and stator is at least 20% and at most 80%.

3. The radial flow machine according to claim 1 , wherein the spring element is dimensioned with the spring force and the displacement device is configured such that when the radial flow machine is in an operating state in which a maximum predetermined torque is reached, the rotor body is pushed axially against the spring force so that the overlap of the opposing surfaces of the rotor body and stator is one hundred percent.

4. The radial flow machine according to claim 1 , further comprising a stop arranged such that the rotor body transmits its torque via the stop to the rotor shaft in an operating state of maximum torque.

5. The radial flow machine according to claim 4 , wherein the spring element is supported against the stop, and the stop is non slidably arranged on the rotor shaft.

6. The radial flow machine according to claim 1 , wherein the spring element comprises a compression spring, a combination of a leaf spring assembly and a plate spring element acting parallel thereto, or a torsion spring.

7. The radial flow machine according to claim 1 , wherein the first displacement element has at least three of the first ramp elements and the second displacement element has at least three of the second ramp elements which correspond to the first ramp elements.

8. The radial flow machine according to claim 1 , wherein the rotor body is conical and the stator body has a corresponding interior space for receiving the conical rotor body.

9. The radial flow machine according to claim 1 , wherein the rotor comprises a first rotor body and a second rotor body.

10. An electric radial flow machine formed as a permanently excited synchronous machine, comprising:
a stator;
a rotor body connected to a rotor shaft for rotation within the stator;
a spring which applies a spring force to the rotor body in an axial direction such that in a first operating position, the rotor body is held in an axial position in which an overlap between opposing surfaces of the rotor body and the stator is less than 100%;
a displacement device configured to generate an axial movement between the rotor body and the stator based on a torque produced between the rotor shaft and the rotor body against the spring force;
the displacement device has a first displacement element, a second displacement element, and at least one rolling element arranged between the first displacement element and the second displacement element;
the first displacement element is connected to the rotor body and is axially slidable and rotatable at least in certain areas on the rotor shaft, which is arranged so that the rotor shaft cannot be slid axially; the second displacement element is connected to the rotor shaft in a rotationally and slidably fixed manner;
the first displacement element on a side facing the second displacement element has pairs of first ramp elements and the second displacement element has pairs of second ramp elements on a side thereof facing the first displacement element; and
the pairs of first ramp elements each meet to form a roller element receiving depression and the pairs of second ramp elements each meet to form an opposing roller receiving depression, and upon a rotation of the first displacement element relative to the second displacement element or vice versa, the rotor body is pushed on the rotor shaft axially against the spring force.

11. The radial flow machine according to claim 10 , wherein the spring element is dimensioned with the spring force such that, when the radial flow machine is at rest, the rotor body and the stator are spaced apart by the spring force when overcoming a magnetic attraction force existing between the rotor body and the stator by a predetermined maximum axial distance d from one another, and the distance d is dimensioned such that the overlap of the opposing surfaces of the rotor body and stator is at least 20% and at most 80%.

12. The radial flow machine according to claim 10 , wherein the spring element is dimensioned with the spring force and the displacement device is configured such that when the radial flow machine is in an operating state in which a maximum predetermined torque is reached, the rotor body is pushed axially against the spring force so that the overlap of the opposing surfaces of the rotor body and stator is one hundred percent.

13. The radial flow machine according to claim 10 , further comprising a stop arranged such that the rotor body transmits its torque via the stop to the rotor shaft in an operating state of maximum torque.

14. The radial flow machine according to claim 13 , wherein the spring element is supported against the stop, and the stop is non slidably arranged on the rotor shaft.

15. The radial flow machine according to claim 10 , wherein the spring element comprises a compression spring, a combination of a leaf spring assembly and a plate spring element acting parallel thereto, or a torsion spring.

16. The radial flow machine according to claim 10 , wherein the first displacement element has at least three of the first ramp elements and the second displacement element has at least three of the second ramp elements which correspond to the first ramp elements.

17. The radial flow machine according to claim 10 , wherein the rotor body is conical and the stator body has a corresponding interior space for receiving the conical rotor body.

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Assignees

• Schaeffler Technologies Ag

Inventors

• Kuhl Dennis
• Witt Holger
• Raber Christoph

Classifications

• H02K2213/09

  Machines characterised by the presence of elements which are subject to variation, e.g. adjustable bearings, reconfigurable windings, variable pitch ventilators · CPC title

• Y02T10/72

  Electric energy management in electromobility · CPC title

• H02K7/12

  with auxiliary limited movement of stators, rotors or core parts, e.g. rotors axially movable for the purpose of clutching or braking · CPC title

• H02K11/24

  Devices for sensing torque, or actuated thereby (H02K11/27 takes precedence) · CPC title

• H02K21/024

  Radial air gap machines · CPC title