# US 10,873,241 B2 · Electromagnetic rotary drive

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- Number: US 10,873,241 B2
- Document ID: US10873241B2
- Status: Granted
- Kind: B2
- Application number: 15/177,764
- Filed: 2016-06-09
- Published: 2017-01-12
- Granted: 2020-12-22
- Earliest claimed: 2015-07-06
- Assignees: Levitronix LLC
- Applicants: Levitronix GmbH
- Inventors: Reto Schöb; Jörg Hugel; Thomas Holenstein
- Web page: https://patentgrep.com/patent/US10873241B2

## CPC

- H02K 7/09: with magnetic bearings
- A61M 60/10: Location thereof with respect to the patient's body
- A61M 60/237: the blood flow through the rotating member having mainly axial components, e.g. axial flow pumps
- A61M 60/422: the force acting on the blood contacting member being electromagnetic, e.g. using canned motor pumps
- A61M 60/508: Electronic control means, e.g. for feedback regulation
- A61M 60/818: Bearings
- B01F 33/4535: {using a stud for supporting the stirring element}
- F04D 3/00: Axial-flow pumps (priming or boosting F04D9/00)
- F04D 13/064: {Details of the magnetic circuit}
- F04D 13/0673: {the motor being of the inside-out type}
- F04D 25/0613: {the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator}
- F04D 29/048: magnetic; electromagnetic
- F04D 29/058: magnetic; electromagnetic
- F16C 32/0446: {Determination of the actual position of the moving member, e.g. details of sensors}
- F16C 32/0457: {Details of the power supply to the electromagnets}
- F16C 32/0465: {with permanent magnets provided in the magnetic circuit of the electromagnets}
- F16C 32/0485: {with active support of three degrees of freedom}
- H02K 1/146: {consisting of a generally annular yoke with salient poles}
- H02K 1/17: Stator cores with permanent magnets
- H02K 1/22: Rotating parts of the magnetic circuit
- H02K 3/18: Windings for salient poles
- H02K 19/103: {Motors having windings on the stator and a variable reluctance soft-iron rotor without windings}
- F16C 32/0489: {with active support of five degrees of freedom, e.g. two radial magnetic bearings combined with an axial bearing}
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})
- A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)}
- B01F: MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING (mixing paints B44D3/06)
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS

## Abstract

An electromagnetic rotary drive includes a magnetically contactlessly drivable rotor free of coils, and a stator configured as a bearing and drive stator configured to drive the rotor magnetically and contactlessly about an axis of rotation. The rotor is capable of being supported magnetically contactlessly with respect to the stator in an operating state. The stator includes an upper stator part having a plurality of pronounced upper poles configured to carry upper windings and a lower stator part having a plurality of pronounced lower poles configured to carry lower windings. The upper stator part and the lower stator part are arranged spaced apart from one another with respect to an axial direction. A permanent magnet is disposed between the upper stator part and the lower stator part.

## Claims

### Claim 1

An electromagnetic rotary drive, comprising:
a magnetically contactlessly drivable rotor free of coils, the rotor comprising a magnetically active core and being free of permanent magnets; and
a stator configured as a bearing and drive stator configured to drive the rotor magnetically and contactlessly about an axis of rotation,
the rotor capable of being supported magnetically contactlessly with respect to the stator in an operating state, and the stator comprising an upper stator part having a plurality of pronounced upper poles configured to carry upper windings and a lower stator part having a plurality of pronounced lower poles configured to carry lower windings, the upper stator part and the lower stator part being arranged spaced apart from one another with respect to an axial direction and a permanent magnet being disposed between the upper stator part and the lower stator part.

### Claim 2 (depends on 1)

A rotary drive in accordance with claim 1, wherein the upper stator part comprises exactly three upper poles or the lower stator part comprises exactly three lower poles.

### Claim 3 (depends on 1)

A rotary drive in accordance with claim 1, wherein a number of the upper poles is equal to a number of the lower poles.

### Claim 4 (depends on 3)

A rotary drive in accordance with claim 3, wherein the upper stator part and the lower stator part form an angle therebetween with respect to the axis of rotation so that, when viewed in the axial direction, the upper poles are each arranged in a gap between two adjacent lower poles, with the angle being 360° divided by a total number of upper and lower poles.

### Claim 5 (depends on 3)

A rotary drive in accordance with claim 3, wherein a number of the upper poles and a number of the lower poles is an even number, with the upper poles and the lower poles being arranged so as to overlap when viewed in the axial direction.

### Claim 6 (depends on 1)

A rotary drive in accordance with claim 1, wherein the rotor comprises at least one impeller configured to convey fluids.

### Claim 7 (depends on 1)

A rotary drive in accordance with claim 1, wherein the rotor is one of at least two separate rotors, each rotor of the at least two separate rotors being magnetically contactlessly drivable and free of coils, the rotors being arranged spaced apart from one another and coaxially with respect to the axial direction in the operating state, and the stator is a first stator of at least two stators, a second stator of the at least two stators being a bearing and drive stator, and comprising an upper stator part having a plurality of pronounced upper poles configured to carry upper windings and a lower stator part having a plurality of pronounced lower poles configured to carry lower windings, the upper stator part and the lower stator part of the first and second stators being arranged spaced apart from one another with respect to the axial direction, and a first permanent magnet being disposed between the upper stator part and the lower stator part of the first stator and a second permanent magnet being disposed between the upper stator part and the lower stator part of the second stator, and the first and second stators are arranged spaced apart from one another with respect to the axial direction in the operating state.

### Claim 8 (depends on 1)

A rotary drive in accordance with claim 1, wherein the magnetically active core of the rotor has a plurality of pronounced rotor poles facing the poles of the stator in the operating state.

### Claim 9 (depends on 8)

A rotary drive in accordance with claim 8, wherein the poles of the rotor are configured or arranged asymmetrically such that positions of engagement with respect to the stator are avoided in the operating state.

### Claim 10 (depends on 8)

A rotary drive in accordance with claim 8, wherein the magnetically active core of the rotor has a ring shape, with a peripheral ring of constant diameter formed at a center with respect to the axial direction and with the poles of the rotor being disposed above and beneath the ring peripheral.

### Claim 11 (depends on 1)

A rotary drive in accordance with claim 1, further comprising a coil arranged as a winding on each upper pole and each lower pole, and for each coil, a separate power amplifier is disposed such that coil current or coil voltage for the coil can be regulated independently of the coil current or the coil voltage of each other coil.

### Claim 12 (depends on 1)

A rotary drive in accordance with claim 1, further comprising a coil arranged as a winding on each upper pole and each lower pole, two coils being connected together to an electrical phase, and a separate power amplifier is provided for the electrical phase.

### Claim 13 (depends on 1)

A rotary drive in accordance with claim 1, wherein the permanent magnet has disk shape or a ring shape, is magnetized in the axial direction and connects the upper stator part to the lower stator part.

### Claim 14 (depends on 1)

A rotary drive in accordance with claim 1, wherein the rotary drive is a pumping or mixing apparatus configured to convey or mix fluid substances or is a component of a pumping or mixing apparatus configured to convey or mix fluid substances.

### Claim 15 (depends on 1)

A rotary drive in accordance with claim 1, wherein the stator is disposed radially inwardly of the rotor.

### Claim 16 (depends on 1)

A rotary drive in accordance with claim 1, wherein the magnetically contactlessly drivable rotor is electrically contactless.