# US 9,882,456 B2 · Magnet wheel

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- Number: US 9,882,456 B2
- Document ID: US9882456B2
- Status: Granted
- Kind: B2
- Application number: 14/366,191
- Filed: 2012-12-19
- Published: 2014-12-11
- Granted: 2018-01-30
- Earliest claimed: 2011-12-20
- Assignees: Continental Automotive GmbH
- Applicants: Lothar Schröder; Jan Weimar
- Inventors: Lothar Schröder; Jan Weimar
- Web page: https://patentgrep.com/patent/US9882456B2

## CPC

- H02K 11/21: Devices for sensing speed or position, or actuated thereby (specially adapted for machines having non-mechanical commutating devices H02K29/06, H02K29/14)
- H02K 1/2733: Annular magnets
- H02K 1/30: using intermediate parts, e.g. spiders
- H02K 29/08: using magnetic effect devices, e.g. Hall-plates, magneto-resistors (H02K29/12 takes precedence)
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

A magnet wheel for an electric motor includes a shaft and a disk made of a plastic containing magnetic particles. The disk is arranged on a carrying hub and the carrying hub is pressed onto the shaft. The carrying hub is a slotted ring around which the disk is molded on by injection molding.

## Claims

### Claim 1

A magnet wheel for an electric motor, comprising:
a shaft (2);
a disk (3) made of a plastic containing magnetic particles; and
an annular support hub (4) on which the disk (3) is arranged, the annular support hub (4) being pressed with the shaft (2), the disk (3) being formed integrally around the annular support hub (4),
wherein the annular support hub (4) has a slot (5), the slot (5) defining a circumferential gap in the annular support hub (4), and
wherein the support hub (4) has only a single notch (6) radially on an outside portion of the support hub (4), the single notch (6) comprising one selected from the group of:
one to four cutouts (8) in the support hub, and
two knurls (7),
the single notch being arranged exclusively in a region, the ends of the region being arranged at least 90° away from the slot (5), no notch being formed in any region less than 90° to the left or right of the slot (5).

### Claim 2 (depends on 1)

The magnet wheel as claimed in claim 1, wherein the support hub (4) is rolled from tape material.

### Claim 3 (depends on 1)

The magnet wheel as claimed in claim 1, wherein the support hub (4) is a turned or stamped part into which the slot (5) is introduced.

### Claim 4 (depends on 1)

The magnet wheel as claimed in claim 1, wherein in a case in which the notch (6) comprises the two knurls, the notch (6) is in the form of at least two impressed portions.

### Claim 5 (depends on 1)

The magnet wheel as claimed in claim 1, wherein in a case in which the notch (6) comprises a single cutout (8) in the support hub (4), the single cutout (8) is arranged opposite the slot (5).

### Claim 6 (depends on 1)

The magnet wheel as claimed in claim 1, wherein in a case in which the notch (6) comprises two to four cutouts (8) in the support hub (4), the two to four cutouts are arranged symmetrically with respect to the slot (5).

### Claim 7 (depends on 1)

The magnet wheel as claimed in claim 1, wherein the disk (3) is formed around the support hub (4) by injection molding.