Surface multipolar rare earth-iron-boron rotor magnet and method

Details Surface multipolar rare earth-iron-boron rotor magnet and method Surface multipolar rare earth-iron-boron rotor magnet and method

1988-04-06

1989-12-19

Salce, Patrick R.

Electrical generator or motor structure

Dynamoelectric

Rotary

148104, 310 44, 335302, 419 29, 420 83, H02K 2106, H01F 702, C22C 75246

Patent

active

048885126

ABSTRACT:
A cylindrical permanent magnet of from 4-48 poles containing, as major components, R (R is at least one rare earth element selected from Nd, Pr, Dy, Ho and Tb and may further contain at least one rare earth element selected from La, Ce, Sm, Gd, Er, Eu, Tm, Yb and Y), B and Fe, and having multipolar anisotropy at the surface without suffering from cracking. The ratios of inner and outer magnet diameters are established as functions of the number of poles. Bushings of ferromagnetic materials allow for reduced permanent magnet thicknesses.

REFERENCES:
patent: 4010434 (1977-03-01), Kools
patent: 4547758 (1985-10-01), Shimizu et al.
patent: 4597938 (1986-07-01), Matsuura et al.
patent: 4600555 (1986-07-01), Shimizu
patent: 4601875 (1986-07-01), Yamamoto et al.
patent: 4628809 (1986-12-01), Das et al.
patent: 4642502 (1987-02-01), Carpenter et al.
patent: 4684406 (1987-08-01), Matsuura et al.
patent: 4737674 (1988-04-01), Miyao
patent: 4755701 (1988-07-01), Shikama

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