Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1977-08-08
1979-03-13
Budd, Mark O.
Electrical generator or motor structure
Dynamoelectric
Rotary
H02K 2112
Patent
active
041444698
ABSTRACT:
A rotor of a permanent magnet type synchronous motor comprises a rotary shaft, a rotary supported by the rotary shaft and including an alternate disposition of a core section in the form of a lamination of a magnetic material which is stacked in the axial direction and a reinforcement section of a non-magnetic material and cavities axially formed in the core and reinforcement sections by passing therethrough, permanent magnets received in the cavities, and a strap interposed at least between the radial outer surface of respective permanent magnets and the opposing inner wall of the cavity, whereby distribution of pressures resulting from a centrifugal force due to the rotation of the rotor, which pressures are imparted on the inner wall of the cavity by the outer surface of the permanent magnet, is uniformed or shared by the strap, thereby preventing the permanent magnet from being fractured.
REFERENCES:
patent: 2303893 (1942-12-01), Mullner
patent: 2519895 (1950-08-01), Edwards et al.
patent: 2522233 (1950-09-01), Merrill
patent: 2831992 (1958-04-01), Blackburn
patent: 3531670 (1970-09-01), Loudon
patent: 4067101 (1978-01-01), Ono
Miyashita Kunio
Okuda Hironori
Tanabe Shoji
Yamashita Seizi
Budd Mark O.
Hitachi , Ltd.
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