Efficient permanent magnet rotor for brushless motor

Details Efficient permanent magnet rotor for brushless motor Efficient permanent magnet rotor for brushless motor

1997-08-21

1999-01-26

Ramirez, Nestor

Electrical generator or motor structure

Dynamoelectric

Rotary

310261, 310264, H02K 2112

Patent

active

058641912

ABSTRACT:
An efficient permanent magnet rotor for a brushless motor has a yoke (2) formed by laminating many steel sheets (4) so as to provide an even number of magnetic poles projected externally, filed permanent magnets (3) inserted in the magnetic poles, bridges (10) provided at either end of the permanent magnets and having a width, among a first minimum width below which said bridges cannot be punched out without breaking, a maximum width at which an allowable maximum number of magnetic fluxes passes through said bridges, and a second minimum width below which said bridges cannot withstand a centrifugal force caused by rotation of said permanent magnet rotor, (1) equal to or larger than the greater one of the first and second minimum widths and smaller than the maximum width when the first and second minimum widths are equal to or smaller than the maximum width, or (2) equal to or larger than the greater one of the first and second minimum widths when said greater one of the first and second minimum widths is equal to or larger than the maximum width, and (3) equal to or larger than the thickness of each of said steel sheets.

REFERENCES:
patent: 4922152 (1990-05-01), Gleghorn et al.
patent: 4939398 (1990-07-01), Lloyd
patent: 4973872 (1990-11-01), Dohogne
patent: 5097166 (1992-03-01), Mikulic
patent: 5159220 (1992-10-01), Kliman
patent: 5369325 (1994-11-01), Nagate et al.

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