Electromagnetic machines with permanent magnet excitation

Details Electromagnetic machines with permanent magnet excitation Electromagnetic machines with permanent magnet excitation

1978-09-29

1980-12-02

Budd, Mark O.

Electrical generator or motor structure

Dynamoelectric

Rotary

310216, 310268, H02K 2126, H02K 122

Patent

active

042373964

ABSTRACT:
An electromagnetic machine (particularly an electric motor) based on the design described in British Patent Application No. 48794/74.
Iron losses in this type of machine are reduced by laminating the rotor backing plate (2,4). Although a spiral lamination (FIG. 3) is preferred, an axial stack of insulated plates (FIG. 2) may be employed.
Interpolar flux leakage is reduced by radially staggering the U-shaped pole pieces around the stator coil (FIG. 4). In addition or alternatively differently shaped pole pieces may be employed, alternately, around the stator assembly (FIG. 5).
Eddy current losses are reduced by replacing the backing plates (2,4) and separate magnets (1,1a,3,3a) with plates (12,14) of sintered magnetic material, permanently magnetized to present alternate North and South poles, therearound.
Alternatively eddy current losses are reduced by forming the backing plates from sintered ferrite material (16,18) and mounting either an array of discrete magnets (20,20a,22,22a) or a magnetized ring such as (16,18), therearound.

REFERENCES:
patent: 2758231 (1956-08-01), Welter
patent: 3303371 (1967-02-01), Moressee et al.
patent: 3315106 (1967-04-01), Reynst
patent: 3529191 (1970-09-01), Baudot
patent: 3700943 (1972-10-01), Heintz
patent: 3984709 (1976-10-01), Kuwako
patent: 3999092 (1976-12-01), Whiteley
patent: 4011475 (1977-03-01), Schmider

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