Permanent magnet rotor with magnet retention band
US4855630A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 5, 1988 |
| Grant date | Aug 8, 1989 |
| Priority date | — |
| Expiry date | May 5, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K1/278
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A rotor structure for a dynamoelectric machine including a magnetic core having a cylindrical outer surface. Equicircumferentially spaced permanent magnets are secured to the face of the core with gaps therebetween on diametrically opposite locations of the core. The outer surfaces of the magnets define a cylindrical surface. A retention band encircles the magnets. The band has a width substantially less than the width of the magnets including opposite ends overlapped and aligned with a securement gap. The core has a first hole aligned with the securement gap. A securement unit has a seat engaging the overlapping ends and a stem in the core hole to lock the band in holding engagement. The head is located within the cylindrical surface. A second hole is diametrically spaced from the first hole and aligned with a second gap. The second hole is formed to balance the rotor and may also receive a second securement unit to establish the band tension. The securement unit is shown as a T-shaped member having a pin which is wedged or threaded into the hole. The securement unit is also shown as an axially elongated wedge and the core hole is an axially elongated slot, with the opposite ends …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.