Abstract: A radial vent composite heat pipe system for cooling and increasing the power density of an electrical machine is provided. The system comprises a plurality of radial vent composite heat pipe assemblies each comprising a slot portion thermally connected to a vent portion. The slot portions are disposable within respective stator slots of a stator core pack of a stator assembly of the electrical machine. The vent portions are disposable within stator vents of the stator assembly. The slot portions absorb heat from the stator coils of the stator assembly and transfer the absorbed heat to the vent portions. The vent portions reject the transferred heat into a cooling air flowing through the respective stator vent, thereby rapidly transferring heat from the respective stator coil to the cooling air flowing through stator vent, and thereby greatly increasing the power density of the electrical machine.

Abstract: A radial vent composite heat pipe system for cooling and increasing the power density of an electrical machine is provided. The system comprises a plurality of radial vent composite heat pipe assemblies each comprising a slot portion thermally connected to a vent portion. The slot portions are disposable within respective stator slots of a stator core pack of a stator assembly of the electrical machine. The vent portions are disposable within stator vents of the stator assembly. The slot portions absorb heat from the stator coils of the stator assembly and transfer the absorbed heat to the vent portions. The vent portions reject the transferred heat into a cooling air flowing through the respective stator vent, thereby rapidly transferring heat from the respective stator coil to the cooling air flowing through stator vent, and thereby greatly increasing the power density of the electrical machine.

Abstract: A submersible gearmotor including a liquid resistant housing with radially inwardly extending partitions which form at least two shaft receiving chambers. The separate chambers act as protective regions between the internal components of the gearmotor and an outside liquid medium when submersed. The gearmotor also includes a tandem seal arrangement including an inboard seal located inside the housing and an outboard seal located outside the housing. The seals prevent the outside liquid medium from entering the gearmotor where the housing intersects with the rotating output shaft. The gearmotor further includes a leak detection system consisting of moisture sensing probes mounted inside one or both of the receiving chambers.