Page iv Abstract Experimental Investigation of Suction Slot Geometry on a Goldschmied Propulsor Nicole Thomason The Goldschmied Propulsor concept combines boundary. Optimization of slot geometry in shock wave boundary layer interaction phenomenon by using CFD–ANN–GA cycle. Controlling the geometry of slots. GD&T Best Practices Controlling the geometry of slots. Figure 1. Alternative Approaches to Controlling an “Open” Slot.
Optimization of Motor Rotor: Slot Shape, Frame Size, Rotor Diameter
We have also confirmed the adequacy of calculating rotor cage impedances using a simple flux tube one dimensional finite element model for simple trade studies. Larger machines may require different bar forms. Using standard analysis techniques and the slot impedance estimation technique described here, we can estimate machine performance for cast aluminum and cast copper. It has a characteristic tapered shape so that the teeth between rotor bars are of uniform section. Camera space rendering allows for drawing an entity slot in the Camera's local space - always making it relative to the camera, and avoiding that other objects are on top.
There has been, in recent years, an effort to make cast copper rotors for industrial use induction motors. The objective is to make motors more efficient because of the higher conductivity of copper. In addition, the reduced losses in such motors may lead to better design flexibility and therefore motors that are more compact. In this paper we examine the tradeoff between running efficiency and starting performance.
In order to understand how induction motors work it is necessary to have a good model for the conduction properties of the conductors in the slots of the rotor. We employ a simple model that has been developed for this purpose. We propose to examine the frequency response of the rotor bar impedance for indications of how the motor will work, taking into account not only running efficiency and starting performance but also stray load losses which are also affected by rotor bar impedance.
The characteristic curve with higher resistance would, for all load torques, operate at a somewhat lower running speed and hence higher slip and lower efficiency than the machine with the lower resistance. On the other hand, starting torque is lower for the low resistance rotor and this might lead to unsatisfactory performance in some applications. The use of copper as the conductor of induction motor rotors would typically lead to improvements in efficiency, relative to motors using aluminum.
This is often done in large motors in which squirrel cages are fabricated from bars of material brazed to end rings. In such machines it is common to employ 'starting' bars of higher resistivity material. Our objective here, however, is to discuss ways of designing rotor slots for fabrication by casting a single material, as is commonly done with aluminum as the rotor conductor material. In some induction motors, what is called the 'deep bar' effect, or distribution of rotor currents due to eddy currents, is taken advantage of.
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Entities can contain geometry, handled via the concept of Slots. Any entity can load geometry into slots, allowing them to either be rendered or treated as a physical part. This is made possible through the following functions in IEntity. Each slot is assigned a local transformation, in relation to its parent. This allows for offsetting the slot geometry from the entity it is attached to, and is especially useful when dealing with multiple slots in one entity.
Camera space rendering allows for drawing an entity slot in the Camera's local space - always making it relative to the camera, and avoiding that other objects are on top.
This is most commonly used for first person shooter weaponry and hands. By default, a slot contains a null material - resulting in the rendered form of a slot using the default material for the object assigned to it.
However, it is often useful to override the material of the slot, allowing custom effects on individual entity geometry. Character instances commonly represent character definitions CDF , created via the Character Tool to create a complex character out of multiple objects. Characters are represented by the ICharacterInstance interface. When assigned to an entity, a particle emitter will follow an entity and thus allow creating very complex effects with ease.
Very often useful, lights can be loaded into entities to create dynamic light sources that can move around the level at run-time.
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