Electromagnetic rotary drive

• US 6,559,567 B2
• Filed: 05/10/2001
• Issued: 05/06/2003
• Est. Priority Date: 05/12/2000
• Status: Active Grant

• Current Assignee: Thoratec LLC
• Original Assignee: Levitronix LLC (George N. Hatsopoulos, PhD)
• Inventors: Schöb, Reto
• Primary Examiner(s): Mullins, Burton S.
• Application Number:
  US09/853,431
• Publication Number:
  US 20020047401A1
• Time in Patent Office: 726 Days
• Field of Search: 310/90.5, 310/156.01
• US Class Current: 310/90.5
• CPC Class Codes: F16C 32/0444 Details of devices to control the actuation of the electromagnets
• CPC Class Codes: F16C 32/0497 generating torque and radial force
• CPC Class Codes: H02K 7/09 with magnetic bearings

Abstract

An electromagnetic rotary drive, designed as bearingless motor, is proposed which comprises a magnetically journalled rotor (3) and a stator (2) which comprises a drive winding for producing a magnetic rotary drive field which produces a torque on the rotor (3), and a control winding for producing a magnetic rotary control field by means of which the position of the rotor (3) with respect to the stator (2) can be regulated, with the stator (2) having exactly six stator teeth (21).

Claims

1. An electromagnetic rotary drive, designed as bearingless motor, the electromagnetic rotary drive comprising:

a magnetically journalled rotor, wherein the magnetically journalled rotor is a permanent magnet rotor; and

a stator, wherein the stator comprises;

a drive winding for producing a magnetic rotary drive field that produces a torque on the rotor, wherein the drive winding includes a number of pole pairs equal to one; and

a control winding for producing a magnetic rotary control field that is usable to regulate the position of the rotor with respect to the stator, wherein the stator has exactly six stator teeth.

2. Rotary drive in accordance with claim 1, wherein the control winding has a number of pole pairs equal to two.

3. Rotary drive in accordance with claim 1, wherein the drive winding is designed to be three-phased.

4. Rotary drive in accordance with claim 1, wherein the control winding is designed to be three-phased.

5. Rotary drive in accordance with claim 1, comprising at least one concentrated coil on each stator tooth.

6. Rotary drive in accordance with claim 1, wherein the drive winding and the control winding are designed as separate windings.

7. Rotary drive in accordance with claim 6, wherein the drive winding and the control winding in each case comprise six concentrated coils, with exactly one coil of the drive winding and exactly one coil of the control winding being wound around each stator tooth.

8. Rotary drive in accordance with claim 6, wherein coils of the drive winding are electrically connected pair-wise in series and coils of the control winding are electrically connected pair-wise in series, with in each case those coils that are wound around diametrically oppositely lying stator teeth being pair-wise connected.

9. Rotary drive in accordance with claim 8, wherein the coils of the one winding are connected pair-wise and being wound in mutually opposite senses and wherein the coils of the other winding are connected pair-wise and being wound in mutually the same sense.

10. Rotary drive in accordance with claim 1, wherein exactly one coil is provided on each stator tooth, each coil being controllable separately and independently of the other coils, and with the drive winding being realized with the same coils as the control winding.