Abstract: Wax-based compositions for making barrier layers used in oral treatment devices are thermally stable when formed into a flat sheet or three-dimensional article to a temperature of at least 45° C. and are plastically deformable at room temperature (25° C.). The wax-based compositions include a wax fraction homogeneously blended with a polymer fraction. The wax fraction includes at least one wax and the polymer fraction includes at least one polymer selected such that, when the at least one wax and at least one polymer are homogeneously blended together, they yield a wax-based composition having the desired properties of thermal stability and plastic deformability. Barrier layers and oral treatment devices made from such wax-based compositions are dimensionally stable to a temperature of at least 40° C. without external support and can be plastically deformed in a user's mouth to become at least partially customized to the size and shape of user's unique dentition.

Abstract: A motor drive system has a rotor assembly that is rotatable about an axis and includes a hollow shaft, a tube, and one or more fin sets. The tube is received in the shaft and defines a first passage. The fin sets are disposed about the tube and are engaged to the shaft. Each fin set defines a plurality of circumferentially spaced apart fins that are coupled to the shaft and the tube. The first passage is configured to discharge fluid communicated therethrough into a return chamber that is formed in the rotor assembly. A plurality of second passages are formed between the shaft and fins and are in fluid communication with the return chamber.

Abstract: A motor drive system with a rotor assembly having an insert, which is received into a blind hollow rotor space in a rotor shaft. The insert is unitarily and integrally formed and defines a central hole, which is disposed along a rotational axis of the rotor assembly, and a plurality of slots that extend through an outer circumferential surface of the insert. The insert is disposed in the rotor shaft such that the outer circumferential surface of the insert is engaged to the inside circumferential surface of the rotor shaft. The central hole forms a first fluid passage through the insert, while the slots form a plurality of second fluid passages through the insert.

Abstract: A motor drive system with a rotor assembly having an insert, which is received into a blind hollow rotor space in a rotor shaft. The insert is unitarily and integrally formed and defines a central hole, which is disposed along a rotational axis of the rotor assembly, and a plurality of slots that extend through an outer circumferential surface of the insert. The insert is disposed in the rotor shaft such that the outer circumferential surface of the insert is engaged to the inside circumferential surface of the rotor shaft. The central hole forms a first fluid passage through the insert, while the slots form a plurality of second fluid passages through the insert.

Abstract: A motor drive assembly having an electric motor with a rotor that includes a rotor shaft and a heat exchanger received in the rotor shaft. The heat exchanger has an insert body with an outer insert surface that is engaged to an inside surface of the rotor shaft. The insert body includes a plurality of segments. Each of the segments defines a first through-hole, and a plurality of second through-holes. Each of the segments is fixedly coupled to one another. A first flow passage extends through the first through-holes in the plurality of segments. Each of the second through-holes defines a portion of a corresponding second flow passage. The second flow passages are disposed concentrically about the first flow passage.

Abstract: A motor drive system with a rotor assembly having an insert, which is received into a blind hollow rotor space in a shaft, a coolant inlet and a coolant outlet. The insert has an insert body, a first flow passage and a plurality of second flow passages. The insert body has an outer insert surface that is engaged to an inside surface of a shaft wall of the shaft. The first flow passage extends longitudinally through the insert body. The second flow passages extend longitudinally through the insert body radially between the outer insert surface and the first flow passage. The coolant inlet is fluidly coupled to one of the first and second flow passages, while the coolant outlet is fluidly coupled to the other one of the first and second flow passages.