The Paradox of Flat Block Magnets in Small Motor Design General Parts Div., Ford Motor Company

Format:

Conference/Event

Author/Creator:

Merriam, F. Richard, author.

Conference Name:

1971 Automotive Engineering Congress and Exposition (1971-01-11 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 1971

Summary:

In many small permanent magnet motors the conventional arc-shaped ferrite magnets can be replaced with flat blocks of high energy ferrites at a substantial economic advantage and with an improvement in motor performance.Confining itself to magnetic field design only for a given armature, this paper shows by rigorous calculation and illustrations the relative effects of varying the design parameters of air gap length, magnet thickness, pole arc angle, magnet length, and magnet grade characteristics.Inherent with flat block magnet field configurations is a longer air gap length at the pole tips. This reduces magnetic cogging and contributes to reduction in pole tip demagnetization due to armature reaction. In addition, the higher energy product of fully oriented flat ferrites relative to the peak energy product of most arcuate segments can result in a significantly lower volume of magnet material required

Notes:

Vendor supplied data

Publisher Number:

710096

Access Restriction:

Restricted for use by site license