US2014205475A1PendingUtilityA1

Dual motor pump for subsea application

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Assignee: DALE HELGEPriority: Aug 23, 2011Filed: Aug 16, 2012Published: Jul 24, 2014
Est. expiryAug 23, 2031(~5.1 yrs left)· nominal 20-yr term from priority
Inventors:Helge Dale
H02K 5/20H02K 16/00H02K 5/132H02K 7/14F04D 13/086F04D 13/08F04D 25/06F04D 13/06
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Claims

Abstract

An apparatus includes a pump having a pump drive shaft for operating the pump, a first motor connected via a first flexible coupling to drive one end of the shaft and a second motor connected via a second flexible coupling to drive the opposite end of the shaft. The apparatus also includes a variable speed drive connecting each of the first and second motors electrically to drive the pump drive shaft.

Claims

exact text as granted — not AI-modified
1 . An apparatus comprising:
 a pump having a pump drive shaft for operating the pump, a first motor connected via a first flexible coupling to drive one end of the shaft and a second motor connected via a second flexible coupling to drive the opposite end of the shaft; and   a variable speed drive connecting each of the first and second motors electrically to drive the pump drive shaft.   
     
     
         2 . The apparatus according to  claim 1  wherein the variable speed drive is common to the first and the second motor. 
     
     
         3 . The apparatus according to  claim 1  wherein at least the first motor comprises an induction motor. 
     
     
         4 . The apparatus according to  claim 1  wherein the first and the second motors comprise induction motors. 
     
     
         5 . The apparatus according to  claim 1  wherein at least the first motor comprises a permanent magnet motor. 
     
     
         6 . The apparatus according to  claim 1  wherein both the first and second motors comprise a permanent magnet motor. 
     
     
         7 . The apparatus according to  claim 1  wherein at least the first motor is liquid cooled. 
     
     
         8 . The apparatus according to  claim 7  wherein the first motor is liquid cooled by a barrier fluid moving in a single circuit. 
     
     
         9 . The apparatus according to  claim 7  wherein the first motor comprises a stator canning comprising a mechanical sleeve and a stator barrier fluid. 
     
     
         10 . The apparatus according to  claim 9  wherein the motor barrier fluid moves in a double circuit. 
     
     
         11 . The apparatus according to  claim 1  wherein the flexible couplings are adapted to allow axial expansion.

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