PUMP WITH GAP-TUBE MOTOR

• US 3,572,982 A
• Filed: 02/24/1969
• Issued: 03/30/1971
• Est. Priority Date: 03/02/1968
• Status: Expired due to Term

• Current Assignee: Kozdon Friedrich
• Original Assignee: Kozdon Friedrich
• Inventors: KOZDON FRIEDRICH
• Application Number:
  US04/801,326
• Time in Patent Office: 764 Days
• US Class Current: 417/423.7
• CPC Class Codes: H02K 29/08 using magnetic effect devices, e.g. Hall-plates, magneto-resistors H02K29/12 takes precedence
• CPC Class Codes: H02K 5/128 using air-gap sleeves or air-gap discs

Abstract

A brushless DC motor having permanent magnets is coaxially joined with a pump rotor within a tubular housing portion of nonmagnetic material. The rotor and the bearings thereof are exposed to the liquid being pumped. The motor has field windings mounted externally on the tubular portion for action upon the permanent magnets. Sensors responsive to the angular position of the permanent magnets control the commutation of the field windings and are mounted on the pump housing externally of the tubular portion.

Claims

1. A pump for chemically aggressive liquids, comprising:

a pump housing having a tubular portion of nonmagnetic material;

a pump rotor coaxially journaled in said housing and having bearings enclosed within said housing so that said rotor and said bearings are exposed to liquid being pumped;

a brushless DC motor having permanent magnet means coaxially joined with said pump rotor within said tubular housing portion and having field windings mounted externally on said tubular portion for action upon said permanent magnet means; and

sensors responsive to angular position of said permanent magnet means for controlling the commutation of said field windings, said sensors comprising galvanomagnetic semiconductor components mounted on said pump housing externally of said tubular portion.

2. A pump as claimed in claim 1 for delivering liquids in hermetically sealed systems, said pump housing having an inlet duct and an outlet duct for ingress and egress respectively of the liquid and being otherwise completely sealed so as to hermetically envelop said pump rotor with said magnet and said bearings.

3. A pump as claimed in claim 1, said angular position sensors consisting of galvanomagnetic two-terminal resistors.

4. A pump as claimed in claim 1, said angular position sensors consisting of Hall generators.

5. A fuel pump for vehicles comprising:

a pump housing having a tubular portion of nonmagnetic material;

a vane-carrying pump rotor coaxially journaled in said housing and having bearings enclosed within said housing so that said rotor and said bearings are exposed to liquid being pumped;

a brushless DC motor having permanent magnet means coaxially joined with said pump rotor within said tubular housing portion and having field windings mounted externally on said tubular portion for action upon said permanent magnet means, said housing having an inlet duct and an outlet duct for ingress and egress respectively of the liquid and being otherwise sealed so as to hermetically envelop said pump rotor with said magnet and said bearings; and

galvanomagnetic sensors responsive to angular position of said permanent magnet means for controlling the commutation of said field windings, said sensors being mounted on said pump housing externally of said tubular portion.