Vacuum pump motor arrangement having reduced heat generation

Details Vacuum pump motor arrangement having reduced heat generation Vacuum pump motor arrangement having reduced heat generation

1997-01-03

1998-07-14

Freay, Charles G.

Pumps

Motor driven

Electric or magnetic motor

417373, 4174103, 4174237, F04B 3504, F04B 5308

Patent

active

057794537

ABSTRACT:
A vacuum pump has a pump casing having a suction side where a suction port is located and a discharge side where a discharge port is located, a pump assembly housed in the pump casing and comprising a pair of pump rotors rotatable in synchronism with each other and having respective shafts, and a brushless direct-current motor mounted on the pump casing at a suction side of the pump casing. The motor has a pair of motor rotors comprising respective sets of permanent magnets which are mounted respectively on the shafts, a pair of cans surrounding outer circumferential and end surfaces of the motor rotors in sealing relation to the pump assembly, a motor stator mounted on the cans and housed in a water-cooled motor frame.

REFERENCES:
patent: 1612330 (1926-12-01), Trumpler
patent: 2937807 (1960-05-01), Lorenz
patent: 3378710 (1968-04-01), Martin, Jr.
patent: 3572982 (1971-03-01), Kozdon
patent: 4797071 (1989-01-01), Veyrat
patent: 5045026 (1991-09-01), Buse
patent: 5354179 (1994-10-01), Maruyama et al.

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