Rotor for an electric motor

• US 4,864,175 A
• Filed: 04/15/1988
• Issued: 09/05/1989
• Est. Priority Date: 04/23/1987
• Status: Expired due to Fees

• Current Assignee: Lothar Rossi
• Original Assignee: Lothar Rossi
• Inventors: Rossi, Lothar
• Primary Examiner(s): Skudy, R.
• Application Number:
  US07/182,475
• Time in Patent Office: 508 Days
• Field of Search: 310/156, 310/268, 310/91, 310/51, 310/261, 310/46, 310/162, 310/157, 74/573 R
• US Class Current: 310/156.29
• CPC Class Codes: H02K 1/2796 where both axial sides of the rotor face a stator
• CPC Class Codes: H02K 21/24 with magnets axially facing the armatures, e.g. hub-type cycle dynamos
• CPC Class Codes: H02K 7/04 Balancing means

Abstract

In connection with a rotor for an electric motor, in particular a disk-type rotor comprising flat magnets being arranged in the form of angular segments and in spaced relationship and supported by supporting disks mounted on both sides of a central hub, it is proposed to provide the supporting disks with window-like openings corresponding to the contour of the said flat magnets so that the flat magnets are seated between the supporting disks without a cover in the axial direction and are secured by them against the effects of centrifugal forces in the sense of rotation and by an integrally formed outer marginal ring, the flat magnets being additionally guided and secured in the axial direction by inner projections formed integrally with the inner central annular disk area. The spoke-like webs which taper towards each other between the flat magnets form together with the outer integrally formed hoop-like ring a stiff triangular structure.

Claims

1. A rotor for an electric motor comprising a plurality of spaced flat magnets, each one being in the form of an angular segment;

a hub;

a supporting disk mounted on each side of said hub;

openings in said disks in the shape of said magnets each receiving a respective one of said plurality of magnets therein;

each of said disks having a central area positioned adjacent to said hub and a plurality of webs extending radially outwardly from said central area, and being located between adjacent magnets;

the webs of said disks tapering toward each other in the radial direction to overlie the side edges of the adjacent magnets;

the webs of each disk terminating in a respective ring which overlies the outermost edge of said plurality of magnets and which is connected to the ring of the other disk, whereby said magnets are secured against centrifugal and other forces.

2. Rotor according to claim 1, characterized in that the central area of each of the said supporting disks (10a, 10b) is connected with the said hub (12) by rivets (15).

3. Rotor according to claim 1, characterized in that said rings are connected by rivets.

4. Rotor according to claim 3, characterized in that said rivets (15) connecting said rings exhibit different weights.

5. Rotor according to claim 3, wherein said rivets are provided in non-uniform distribution about said rings to balance said rotor.

6. Rotor according to claim 1, characterized in that all connection points between the said supporting disks (10a, 10b) are connected by gluing.

7. Rotor according to claim 1, characterized in that radial projections extend from said central disk area, the said projections being sized to overlie said magnets to serve as axial guide for the flat magnets (17), on both sides thereof.

8. Rotor according to claim 1, characterized in that the said flat magnets (17) are fixed by gluing in the openings formed by the said supporting disks (10a, 10b).