# US 8,541,912 B2 · Planar motor for positioning a load along a plane

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- Number: US 8,541,912 B2
- Document ID: US8541912B2
- Status: Granted
- Kind: B2
- Application number: 12/120,451
- Filed: 2008-05-14
- Published: 2008-11-27
- Granted: 2013-09-24
- Earliest claimed: 2007-05-25
- Assignees: Etel S.A.
- Applicants: Vincent Cardon; Jean-Pierre Morel
- Inventors: Vincent Cardon; Jean-Pierre Morel
- Web page: https://patentgrep.com/patent/US8541912B2

## CPC

- H02K 41/031: {of the permanent magnet type}
- H02K 2201/18: Machines moving with multiple degrees of freedom
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

A planar motor includes a flat base element arranged in a plane, and substantially cuboidal first magnets arranged on the base element whose magnetization is perpendicular to the plane and which are arranged at evenly spaced intervals and with alternating polarity in a first direction and in a second direction. The planar motor also includes substantially cuboidal second magnets whose magnetization is parallel to the plane and which are disposed with alternating polarity in the first direction and second direction between the first magnets, so that each first magnet is surrounded by four second magnets. The first magnets are disposed on protrusions of the base element.

## Claims

### Claim 1

A planar motor, comprising:
a flat base element arranged in a plane;
substantially cuboidal first magnets arranged on the base element , magnetization of the first magnets perpendicular to the plane, the first magnets arranged at evenly spaced intervals and with alternating polarity in a first direction and in a second direction;
substantially cuboidal second magnets, magnetization of the second magnets parallel to the plane, the second magnets arranged with alternating polarity in the first direction and the second direction between the first magnets, each first magnet surrounded by four second magnets;
wherein the first magnets are arranged on protrusions of the base element;
wherein the second magnets are arranged in grooves formed by two adjacent protrusions; and
wherein a width of the groove corresponds to a width of the second magnets over a full depth of the groove so that the second magnets are supported laterally by the potrusions.

### Claim 2 (depends on 1)

The planar motor according to claim 1, wherein, perpendicular to the plane, a sum of a height of the first magnets and a height of the protrusions corresponds to a height of the second magnets so that surfaces of the first magnets and the second magnets facing away from the base element are located in a common plane parallel to the base element.

### Claim 3 (depends on 1)

The planar motor according to claim 1, wherein perpendicular projections of the protrusions and of the first magnets into the plane are congruent.

### Claim 4 (depends on 1)

The planar motor according to claim 1, wherein the base element is formed of a steel plate.

### Claim 5 (depends on 1)

The planar motor according to claim 1, wherein the base element is formed of at least one of (a) aluminum, (b) a composite material, (c) an epoxide, and (d) polyoxymethylene.

### Claim 6 (depends on 1)

The planar motor according to claim 1, wherein the first magnets are cemented to the base element.

### Claim 7 (depends on 1)

The planar motor according to claim 1, wherein the second magnets are cemented to the base element.

### Claim 8 (depends on 4)

The planar motor according to claim 4, wherein the grooves are at least one of (a) trapezoidal and (b) dovetailed.

### Claim 9 (depends on 1)

The planar motor according to claim 1, wherein the four second magnets surrounding each first magnet have a same magnetization direction with respect to the first magnet.

### Claim 10 (depends on 1)

The planar motor according to claim 1, wherein the first magnets and the second magnets are arranged in a two-dimensional Halbach array.

### Claim 11 (depends on 1)

The planar motor according to claim 1, further comprising a movable part arranged on a side of the first magnets and the second magnets opposite to the base element, the movable part including at least one coil.

### Claim 12 (depends on 11)

The planar motor according to claim 11, wherein the coil is arranged as an elongated coil.

### Claim 13 (depends on 1)

The planar motor according to claim 1, wherein the protrusions are formed by at least one of (a) machining, (b)stamping, (c) casting, (d) sintering, and (e) electrodeposition.

### Claim 14

A planar motor, comprising:
flat base means arranged in a plane;
substantially cuboidal first magnet means arranged on the base means, magnetization of the first magnet means perpendicular to the plane, the first magnet means arranged at evenly spaced intervals and with alternating polarity in a first direction and in a second direction;
substantially cuboidal second magnet means, magnetization of the second magnet means parallel to the plane, the second magnet means arranged with alternating polarity in the first direction and the second direction between the first magnet means, each first magnet means surrounded by four second magnet means;
wherein the first magnet means are arranged on protrusion means of the base means;
wherein the second magnet means are arranged in grooves formed by two adjacent protrusions means; and
wherein a width of the groove corresponds to a width of the second magnet means over full depth of the groove so that the second magnet means are supported literally by the protrusions.