Clean pump

Details Clean pump Clean pump

1992-11-25

1994-09-27

Bertsch, Richard A.

Pumps

Motor driven

Electric or magnetic motor

417420, 310 905, F04B 1700

Patent

active

053502833

ABSTRACT:
In a clean pump of the present invention, a magnetic coupling is formed by a permanent magnet attached to a rotor and a permanent magnet attached to an impeller, with a combined electromagnet arranged to be opposed to a soft iron member of the impeller at the side opposite to the rotor. The combined electromagnet is provided with a permanent magnet arranged at one side of its core and two coils wound around the permanent magnet. These coils are zero-power controlled by a control circuit based on outputs of position sensors such that the impeller is supported approximately at the center of a casing by an attracting force of the permanent magnets and an attracting force of the permanent magnet of the combined electromagnet.

REFERENCES:
patent: 3107310 (1963-10-01), Carriere
patent: 3575536 (1971-04-01), Jacobs
patent: 4312628 (1982-01-01), Yamamura
patent: 4523896 (1985-06-01), Lhenry et al.
patent: 4642036 (1987-02-01), Young
patent: 4688998 (1987-08-01), Olsen et al.
patent: 4763032 (1988-08-01), Bramm et al.
patent: 4806080 (1989-02-01), Mizobuchi et al.
patent: 4841184 (1989-06-01), Chen
patent: 4944748 (1990-07-01), Bramm et al.
patent: 4948348 (1990-08-01), Doll et al.
patent: 4984972 (1991-01-01), Clausen et al.
patent: 5112202 (1992-05-01), Oshima et al.

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