Permanent magnet linear door motor

Details Permanent magnet linear door motor Permanent magnet linear door motor

1990-10-31

1992-12-29

Beha, Jr., William H.

Electrical generator or motor structure

Dynamoelectric

Linear

318135, H02K 4100

Patent

active

051754550

ABSTRACT:
A linear motor comprises: a first module having several aligned permanent magnets separated by gaps of fixed length, the magnets being disposed so that their North and South poles alternate in plane; a second module formed of one or more pairs of U-shaped electromagnets, the electromagnets having parallel legs and being separated from an adjacent electromagnet by a width equal to that of the gaps between the permanent electromagnets disposed on the fixed module, the electromagnet being connected such that when one of the electromagnets is in register with a gap between two permanent magnets, the other is in register with a third permanent magnet; and, a means for supplying the electromagnets with power as a function of the position of the electromagnet, such that each electromagnet; has a given polarity between a first point beyond register with a permanent magnet by a certain distance and a second point before register with a next permanent magnet by a certain distance, has no power supplied between the second point and a third point when the electromagnet passes beyond the next permanent magnet, and has a reverse polarity at and beyond the third point etc.

REFERENCES:
patent: 2303263 (1942-11-01), Fisher
patent: 2365632 (1944-12-01), Fisher
patent: 3771462 (1973-11-01), Barthalon et al.
patent: 4329636 (1982-05-01), Uchida et al.
patent: 4623806 (1986-11-01), Yoshikawa
patent: 4707642 (1987-11-01), Sorimachi et al.
patent: 4803387 (1989-02-01), Seider
French Search Report dated Oct. 19, 1990 (2 pages).

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