Actuator system with dual chambers

Patent metadata

Field	Value
Publication number	US-9835222-B2
Application number	US-201415034042-A
Country	US
Kind code	B2
Filing date	Nov 10, 2014
Priority date	Nov 12, 2013
Publication date	Dec 5, 2017
Grant date	Dec 5, 2017

Abstract

The present invention relates to an actuator system with a magnetic lead screw, comprises a magnetic rotor and a translator cylinder, the translator cylinder comprises a magnetic stator, the translator cylinder has a closed first end and a second end confined by a lid, the lid having a shaft opening for a shaft coupled to the magnetic rotor, wherein the magnetic rotor, when inserted in the translator cylinder, is arranged to translate a linear movement of the translator cylinder into a rotational movement of the magnetic rotor by using magnetic flux interacting between the magnetic stator and the magnetic rotor, said rotational movements is being transferred through a shaft, the lid with a shaft opening arranged for receiving the shaft, wherein the shaft is arranged to make both the linear and the rotational movement in the shaft opening, the lid being arranged for confining the second end of the translator cylinder, the translator cylinder confined by the lid forms, when divided by the magnetic rotor, a first chamber with a first volume and a second chamber with a second volume, wherein the first volume and the second volume changes as a function of the linear movement. The invention also relates to a method of operating an actuator system with a magnetic lead screw.

First claim

The invention claimed is:

1. An actuator system comprising:
a magnetic lead screw, comprises a magnetic rotor and a translator cylinder, the translator cylinder comprises a magnetic stator,
the translator cylinder has a closed first end and a second end confined by a lid, the lid having a shaft opening for a shaft coupled to the magnetic rotor,
wherein the magnetic rotor, when inserted in the translator cylinder, is arranged to translate a linear movement of the translator cylinder into a rotational movement by using magnetic flux interacting between the magnetic stator and the magnetic rotor, said rotational movements is being transferred through the shaft,
the lid with the shaft opening arranged for receiving the shaft, wherein the shaft is arranged to make both the linear and the rotational movement in the shaft opening, the lid being arranged for confining the second end of the translator cylinder,
the translator cylinder confined by the lid forms, when divided by the magnetic rotor, a first chamber with a first volume and a second chamber with a second volume, wherein the first volume and the second volume changes as a function of the linear movement and wherein the first chamber and the second chamber are sealed from each other by at least one first seal arranged to operate between the translator cylinder and the magnetic rotor.

2. The actuator system according to claim 1 , wherein the magnetic rotor is arranged with a magnetic domain forming a helical shape and the magnetic stator is arranged with a magnetic domain forming a helically shape.

3. The actuator system according to claim 1 , wherein a top chamber is arranged to be sealed by at least one second seal.

4. The actuator system according to claim 1 , wherein the magnetic rotor is arranged in the translator cylinder with at least one guide system.

5. The actuator system according to claim 1 , wherein the first chamber comprises a first fluid and the second chamber comprises a second fluid.

6. The actuator system according to claim 5 , wherein the system further comprises at least one reservoir tank, said reservoir tank being arranged for communicating with the first fluid and the second fluid.

7. The actuator system according to claim 5 , wherein the system further comprises at least one reservoir tank, said reservoir tank being arranged for communicating with the first fluid.

8. The actuator system according to claim 5 , wherein the system further comprises at least one reservoir tank, said reservoir tank being arranged for communicating with the second fluid.

9. The actuator system according to claim 1 , wherein the first chamber comprises at least one valve arranged for controlling a pressure in said chamber.

10. The actuator system according to claim 1 , wherein the second chamber comprises at least one valve arranged for controlling a pressure in said chamber.

11. The actuator system according to claim 1 , wherein the system further comprises an electrical machine, and wherein the shaft is connected with the electrical machine.

12. The actuator system according to claim 11 , wherein the shaft transfers the rotational movement of the rotor to the electrical machine through a shaft coupling coupled to the shaft.

13. The actuator system according to claim 1 , wherein the first chamber and the second chamber each comprises at least one valve arranged for controlling a pressure in the chamber.

14. The actuator system according to claim 1 , wherein at least one of the first chamber and the second chamber operates as a pump.

15. The actuator system according to claim 1 , wherein at least one of the first chamber and the second chamber works as a spring or a damper.

16. The actuator system according to claim 1 , wherein the magnetic lead screw is configured as an active damper for a vehicle.

17. The actuator system according to claim 16 , wherein the active damper further comprises a coil spring.

18. Method for operating an actuator system, the actuator system comprises a magnetic lead screw, with a magnetic rotor being operably positioned in a translator cylinder with a magnetic stator, the translator cylinder having, a closed first end and a second end confined by a lid, the lid having a shaft opening for a shaft coupled to the magnetic rotor, the method comprising:
providing a linear movement of the translator cylinder,
translating the linear movement of the translator cylinder into a rotational movement of the magnetic rotor by using a magnetic flux interacting between the magnetic stator and the magnetic rotor, said rotational movement being transferred through the shaft,
receiving the shaft in the shaft opening, where the shaft carries out both the linear and the rotational movement in the shaft opening,
dividing the translator cylinder by the magnetic rotor, and thereby forming a first chamber with a first volume and a second chamber with a second volume,
changing the first volume and the second volume as a function of the linear movement.

Assignees

• Univ Aalborg

Inventors

• Berg Nick Ilso
• Holm Rasmus Koldborg
• Rasmussen Peter Omand

Classifications

• F04B19/022

  reciprocating cylinders · CPC title

• F16F2232/06

  Translation-to-rotary conversion · CPC title

• B60G2202/32

  The spring being in series with the damper and/or actuator · CPC title

• F16F13/00 Primary

  Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs (F16F5/00, {F16F6/00, F16F9/003} take precedence) · CPC title

• H02K2201/18

  Machines moving with multiple degrees of freedom · CPC title