Abstract: An integral combination of two motor pumps wherein two pumps 12, 14 are operated preferably from the motor shafts 41, 43 of a centrally located, pancake-type, d.c., brushless electric motor 10, the entire combination being housed in a unitary casing. The stator 22 is located within a central peripheral cavity between a pair of rotor faces 26, 28 in which are set spaced permanent mangets 32, 34 which react with the commutated d.c. fields of the stator coils to rotate the rotors 36, 38. Each rotor, e.g. 38, is integral with a motor shaft section which is integrally coupled with a pump shaft, e.g., 44. The pump shaft 44 supports an inducer 46 and an impeller 48 which pump a fluid that is also sent through passages in the motor 10 to lubricate the sleeve bearings 54 and to cool the motor components. The speeds of the rotor 36, 38 can be individually adjusted, for example, by adjusting the number of permanent magnets 32, 34 in each rotor face 26, 28.

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.