Electromagnetic rotary drive, a centrifugal pump and a pump unit

Patent metadata

Field	Value
Publication number	US-11879466-B2
Application number	US-202217710566-A
Country	US
Kind code	B2
Filing date	Mar 31, 2022
Priority date	Apr 26, 2021
Publication date	Jan 23, 2024
Grant date	Jan 23, 2024

Abstract

An electromagnetic rotary drive includes a rotor and a stator. The rotor magnetically driven without contact about an axial direction, and magnetically levitated without contact with respect to the stator. The rotor actively magnetically levitated in a radial plane and passively magnetically stabilized in the axial direction against tilting. The stator has coil cores, each including a longitudinal limb extending in the axial direction and a transverse limb arranged in the radial plane. The transverse limb extends from the longitudinal limb and is bounded by an end face. A concentrated winding is arranged on each of the longitudinal limbs surrounding a respective longitudinal limb. The end faces have a first distance in the radial direction from a first portion and a second distance in the radial direction from a second portion, the second distance greater than the first distance.

First claim

What is claimed is:

1. An electromagnetic rotary drive configured as a temple motor, comprising:
a rotor comprising a ring-shaped or disk-shaped magnetically effective core; and
a stator configured as a bearing and drive stator, by which the rotor is configured to be magnetically driven without contact in an operating state about an axis of rotation which defines an axial direction, and by which the rotor is capable of being magnetically levitated without contact with respect to the stator, the rotor configured to be actively magnetically levitated in a radial plane perpendicular to the axial direction and passively magnetically stabilized in the axial direction and against tilting, the stator having a plurality of coil cores, each of the coil cores comprising a longitudinal limb extending in the axial direction and a transverse limb arranged in the radial plane, the transverse limb extending from the longitudinal limb in a radial direction and bounded by an end face facing the magnetically effective core of the rotor, and at least one concentrated winding arranged on each of the longitudinal limbs surrounding a respective longitudinal limb, each of the longitudinal limbs comprising a first portion and a second portion arranged adjacent to each other with respect to the axial direction, the transverse limb for each of the coil cores arranged at the second portion, the end face of each of the transverse limbs has a first distance in the radial direction from the first portion of the respective longitudinal limb and a second distance in the radial direction from the second portion, the second distance greater than the first distance.

2. The rotary drive according to claim 1 , wherein for each of the longitudinal limbs, the first portion and the second portion are arranged parallel to each other and are connected to each other by a transition region in which a radial distance from an end face of a respective transverse limb changes from the first distance to the second distance.

3. The rotary drive according to claim 1 , wherein the magnetically effective core has a rotor height which is a maximum extension of the magnetically effective core in the axial direction (A), and the rotor height is greater than a stator pole height defined by a maximum extension of the end faces of the transverse limbs in the axial direction.

4. The rotary drive according to claim 1 , wherein the second distance is greater than half of a stator pole height defined by a maximum extension of the end faces of the transverse limbs in the axial direction.

5. The rotary drive according to claim 3 , wherein the magnetically effective core comprises a central region arranged with respect to the axial direction between a first edge region and a second edge region, and having a rotor diameter, the first edge region forming a first axial boundary surface of the magnetically effective core and has a first edge diameter, the second edge region forming a second axial boundary surface of the magnetically effective core and having has a second edge diameter, and each of the first and second edge diameters being smaller than the rotor diameter.

6. The rotary drive according to claim 5 , wherein the central region has a central height which is an extension of the central region in the axial direction, and the central height is a same height size as the stator pole height.

7. The rotary drive according to claim 5 , wherein the magnetically effective core has an outer surface that is not parallel to the axial direction either between the central region and the first axial boundary surface or between the central region and the second axial boundary surface.

8. The rotary drive according to claim 1 , wherein the at least one concentrated winding includes two concentrated windings disposed on each of the longitudinal limbs, each of the two concentrated windings surrounding the respective longitudinal limb, and being arranged adjacent to each other with respect to the axial direction.

9. A centrifugal pump for conveying a fluid, comprising:
the electromagnetic rotary drive claim 1 , the rotor of the electromagnetic rotary drive being the rotor of the centrifugal pump.

10. The centrifugal pump according to claim 9 , further comprising a pump unit with a pump housing comprising an inlet and an outlet for the fluid to be conveyed, the rotor is disposed in the pump housing and comprises a plurality of vanes for conveying the fluid, the pump unit configured to be inserted into the stator such that the magnetically effective core of the rotor is surrounded by the end faces of the transverse limbs.

11. A pump unit for a centrifugal pump, the pump unit configured for the centrifugal pump according to claim 9 .

12. The pump unit according to claim 11 , wherein the pump housing comprises a base part and a cover connected to each other in a sealing manner, and the outlet of the pump housing is completely arranged in the base part.

13. The pump unit according to claim 11 , wherein the rotor has a central bore extending completely through the rotor in the axial direction.

14. The pump unit according to claim 11 , wherein the pump unit is configured to be detachably connected to the stator of the centrifugal pump.

15. The pump unit according to claim 11 , wherein the pump unit is a single-use device for single use.

Assignees

• Levitronix Gmbh

Inventors

• Stettler Marcel
• Schneeberger Thomas

Classifications

• F04D29/048

  magnetic; electromagnetic · CPC title

• F04D13/06 Primary

  the pump being electrically driven · CPC title

• A61M60/232

  Centrifugal pumps · CPC title

• F04D13/027

  Details of the magnetic circuit · CPC title

• F04D29/4293

  Details of fluid inlet or outlet · CPC title