Motor/rotor assembly

The initial SRL and ANL contactors used motorized spindles to drive the contactor rotors. These spindles have a large-diameter shaft that gives good stiffness to the motor/rotor assembly. The shaft is also hollow so that it can supply air to the... 

Figure 10.17 shows an eight-stage 4-cm contactor. The motors are also face mounted, as discussed by Leonard (1988). There is only one leg between the two four-stage banks of contactors. In later units, one leg has been put at each end of each bank of contactors. This design makes it easier to handle individual banks of four contactor stages. A four-stage 10-cm contactor is shown in Figure 10.18. In this photograph, an overhead crane is lifting one of the motor/rotor assemblies out of the contactor housing.

Feed material enters the inlet [2] and flows onto a distributor plate [5], which is part of the rotor assembly. The initiation of feed to the WFE occurs at the same time that the drive and motor [1] are started. As the rotor unit turns, centrifugal force spreads the feed from the distributor plate onto the heated wall of the WFE. Volatile components, such as glycerine, are rapidly evaporated. Slotted wiper blades [8] connected to the rotor evenly distribute the feed material into a uniform, agitated, thin film and continuously move material down the heated wall, including highly viscous materials. 

Figure 9.18 Condensate pump motor destroyed. The explosion knocked the rotor assembly out of the 75 Elp pump motor.

The superior toughness and fatigue strength of PEEK has led to its use in digital motors for Dyson vacuum cleaners. This helps double the life of the motor, which can be one of the first components to wear out. The fan spins at 100,000 rpm. The fan and rotor assembly is fixed on a shaft using PEEK spacers and PEEK bearing cages are used in the motor assembly. 

Reactor coolant pump assembly rotational inertia is provided by a flywheel (inside the pump pressure boundary) motor rotor, and other rotating parts. These have been assessed in section 5.4 of Reference 4.4 to demonstrate that failures would not breach the coolant boundary. 

FIG. 18-50 Intermeshing corotating twin screw extruder (a) drive motor, (h) gearbox, (c) feed port, (d) barrel, (e) assembled rotors, (f) vent, (g) barrel valve, (h) kneading paddles, ( ) conveying screws, (/) splined shafts, (k) blister rings, (APV Chemical Machinery, Inc.)... 

The exciter is an AC generator with a stator-mounted field. Direct cur rent for the exciter field is provided from an external source, typically u small variable voltage rectifier mounted at the motor starter. Exciter oui put is converted to DC through a three-phase, full-wave, silicon-diode bridge rectifier. Thyristors (silicon-controlled rectifiers) switch the cur rent to the motor field and the motor-starting, field-discharge resistors These semiconductor elements are mounted on heat sinks and assembled on a drum bolted to the rotor or shaft. 

The apparatus is shown in Fig. 4.1. The body of the extraction vessel is made from Pyrex. Separation is effected by absorption of a batch containing both phases into a porous 2 cm diameter nickel-chrome alloy disc (A), the upper surface of which is domed. The disc is mounted on the end of a stainless-steel shaft (B) turned by a geared high-torque electric motor. The disc-shaft-motor assembly can he transported along its axis of rotation to any of three stations. The assembly is shown at its bottom station, with the porous disc within the inner vessel (C), around which is a collar (D) forming the first annular pocket (E). The collar itself forms the inner wall of the second annular pocket (F), the outer wall of which extends upwards to support a Perspex Hd (G) on which the rotor (H) is situated. The inner vessel and both annular pockets are fitted with drain valves. A stiff piece of platinum wire is passed through the Hd into the glassware as far as the level of the first annular pocket. 

Figure 9-6. Preparative ultracentrifuge (a) with the cover panels in place, and (b) from the front and (c) from the rear with the cover panels removed. A, armor plate surrounding the rotor chamber B, drive and gear assembly C, electronics bank housing the speed, temperature, and vacuum control and monitoring systems D, vacuum pump E, vacuum pump motor F, refrigeration unit G, diffusion pump and H, drive oil reservoir. (Courtesy of Beckman Instruments, Palo Alto, Calif.)...

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