Sealed and balanced motor and fluid pump system

• US 4,644,202 A
• Filed: 04/15/1985
• Issued: 02/17/1987
• Est. Priority Date: 04/15/1985
• Status: Expired due to Fees

• Current Assignee: Rockwell International Corporation
• Original Assignee: Rockwell International Corporation
• Inventors: Kroy, Ralph E., Catterfeld, Fritz C.
• Primary Examiner(s): SKUDY, ROBERT
• Application Number:
  US06/722,915
• Time in Patent Office: 673 Days
• Field of Search: 310/46, 310/66, 310/156, 310/90, 310/268, 310/114, 310/112, 310/62, 310/63, 310/89, 310/54, 310/58, 310/88, 310/59, 310/60 R, 310/61, 310/52, 310/67 R, 417/369, 417/370, 384/313, 384/316, 277/53, 415/174
• US Class Current: 310/58
• CPC Class Codes: F04D 13/0666 the motor being of the plane gap type
• CPC Class Codes: H02K 7/086 radially supporting the rotor around a fixed spindle; radially supporting the rotor directly H02K7/09 takes precedence
• CPC Class Codes: H02K 7/14 Structural association with mechanical loads, e.g. with hand-held machine tools or fans with fan or impeller for cooling the machine H02K9/06
• CPC Class Codes: H02K 9/19 for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
• CPC Class Codes: Y10S 277/93 Seal including heating or cooling feature

Abstract

A pancake, d.c., brushless electric motor 10 and pump 32 in which the rotating parts of the pump 32 are integral with the rotor 18 of the motor 10. The motor and pump housing is hermetically sealed from the flow of the pumped fluid. A small portion of fluid is leaked through a seal 38 and acts to cool the motor 10 and to lubricate a sleeve bearing 24 which supports the rotor 18 on the motor'"'"'s stationary shaft 26. The rotor 18 has permanent magnets 22 divided into two sets which lie on opposite sides of the poles of the stator coils 14 and, therefore, the magnetic thrust between stator and rotor is balanced out.

Claims

1. A unitary electric magnetic-thrust balanced motor and fluid pump system for use in a reaction engine comprising:

a hermetically-sealed motor casing having an exterior and interior;

a stationary shaft supported wholly within and bonded to the casing interior;

an internal sleeve bearing supported rotatably by the stationary shaft;

an internal rotor having two opposing faces and including a peripheral annular recess formed in the center of the rotor;

opposing rotor faces positioned on opposite sides of the recess;

means for coupling the sleeve bearing rotatably with the rotor;

an internal annular stator, having at least two stator coils and poles, housed inside the rotor peripheral annular recess;

an internal rotating shaft having a proximal end and a distal end integrally coupled to the rotor at the proximal end thereof;

a central bore within the stationary shaft passing from the proximal end to the distal end thereof;

radial holes formed in the shaft at the proximal end and at the distal end in communication with the bore;

permanent magnets set into the rotor faces in opposing relationship to the stator coils;

labyrinthine seals formed on the rotating shaft near the distal end thereof;

an impeller integrally associated with the distal portion of the rotor;

means for introducing a fluid into the impeller;

a fluid collector volute recess formed within the casing in functional association with the impeller; and

means for introducing and channeling a motor coolant and lubricant fluid into the motor and fluid pump system.

2. A motor and fluid pump system according to claim 1 wherein said means for introducing and channeling said motor coolant and lubricant fluid into the system includes lubricating passageways associated with the fluid collector volute and the labyrinthine seals and communicating with the rotor, the stator, and the motor casing interior.

3. A motor and fluid pump system according to claim 1 wherein said means for introducing and channeling said motor coolant and lubricant fluid into the system further includes coolant passages associated with the labyrinthine seals and communicating with peripheral annular coolant passages annularly surrounding the stator coils and located within the stator for cooling the stator coils.

4. A motor and fluid pump system according to claim 1 wherein said means for introducing and channeling said motor coolant and lubricant fluid into the system further includes

bifurcating coolant and lubricating passages depending from the annular coolant passages surrounding the stator coils;

the bifurcating coolant and lubricating passages forming two sections;

one section diverting to radial holes communicating with the shaft bore at the proximal end of the shaft causing said coolant and lubricating fluid to pass into the shaft bore at the proximal end and exit the shaft bore through the radial holes proximate the distal end of the shaft;

second section of the bifurcating coolant passage interfacing at the proximal end of the sleeve bearing whereby said coolant and lubricant fluid is forced between the sleeve bearing and the shaft; and

a fluid collection recess at the distal end of the shaft including passages in the rotating shaft communicating between the recess and the impeller whereby said coolant and lubricating fluid introduced into the pump system is reintroduced into the fluid collector volute recess.

5. A motor and fluid pump system according to claim 1 wherein the means for coupling the sleeve bearing rotatably with the rotor comprise bolts.

6. A motor and fluid pump system according to claim 1 wherein the shaft is bonded to the casing by welding.

7. A motor and fluid pump system according to claim 1 wherein the means for introducing and channeling said motor coolant and lubricant fluid into the motor and fluid pump system comprises a pump inducer.

8. A motor and fluid pump system according to claim 1 wherein the motor coolant and lubricant fluid is a propellant.

9. A motor and fluid pump system according to claim 1 wherein the sleeve bearing is made of carbon.

10. A motor and fluid pump system according to claim 1 wherein the rotor is axially thrust balanced by the placement of the rotor permanent magnet on opposite sides of each of said stator coils and poles.