Charles A Powers

US Patent:

20110211979, Sep 1, 2011

Filed:

Feb 26, 2010

Appl. No.:

12/713943

Inventors:

Behrend Goswin Schlenhoff - Hamburg, DE
Axel Helmut Tank-Langenau - Remmels, DE
Charles James Powers - Westminster MD, US
Thomas Albers - Ahrensburg, DE

International Classification:

F04B 53/08
F04B 17/03
H02K 9/19
H02K 5/132

US Classification:

4174101, 310 54, 310 87

Abstract:

A multistage electric motor includes a plurality of motor stages connected in series, each motor stage comprising a stator, and a rotor; a plurality of cooling fluid paths, each cooling fluid path forming a recirculating loop independent of the other cooling fluid paths, each cooling fluid path in communication with the stator of one of motor stages; and a cooling fluid flowing through each cooling fluid path, the cooling fluid removing heat from the stator of each motor stage. A submersible pump including the multistage electric motor, and a method of cooling the multistage electric motor are also described.