consisting of a rotor 82 a and a rotor shaft 82 b mis located within rotor cavity 79 rotor shaft 82 b is supported by a rear bearing 96 positioned within the rear cover 74 which plugs the rear opening of the rotor cavity 79 and a front bearing 86 and seals 100 positioned within a front cover 70 which plugs the forward opening of the rotor cavity 79 drive pin 84 is positioned transversely through rotor shaft 82 b and drives impeller 76 referring to fig9 unlike the preferred embodiment this alternative embodiment has two separate sets of diffuser vanes the first set 81 being configured on the front cover 70 and the second set 83 being configured on the stator housing assembly 64 0039 fig1 and 11 clearly show the resultant fluid passage 88 formed between the vanes 83 and the inner and outer walls 73 a 73 b of the metal case 73 the encapsulated stator assembly 75 may be manufactured by locating the stator assembly 90 within the substantially cylindrical metal case 73 and temporarily capping the two open ends of the metal case the stator assembly 90 would then be encapsulated in a polymeric thermally conductive electrically insulative material 77 the opposing ends of the metal case would be uncapped and.