Solid-state technology

Speed control through. solid-state technology 6/99... 

Energy conservation through solid-state technology 6/134... 

Application of solid-state technology operation of a process plant 6/142... 

Speed control through solid-state technology... 

In the following text we have discussed bow. with the application of varying supply parameters (V and/), one can alter the characteristics of a fixed parameter induction motor in any desired way. We then deal with the application of solid-state technology to obtain the variations in the fixed supply parameters to achieve the required controls in an a.e. machine. 

Induction motors, both, squirrel cage and slip-ring, can be easily controlled to achieve the required characteristics by applying solid-state technology. 

A very important feature of solid-state technology is energy conservation in the process of speed control. The slip losses that appear in the rotor circuit are now totally eliminated. With the application of this technology, we can change the characteristics of the motor so that the voltage and frequency are set at values just sufficient to meet the speed and power requirements of the load. The power drawn from the mains is completely utilized in doing useful work rather than appearing as stator losses, rotor slip losses or external resistance losses of the rotor circuit. 

With the application of solid-state technology, however, as di.scussed above, the potential energy of the loads in hoists, lifts and conveyors during descents can be saved and fed back to the source. 

Static drives using solid-state technology (see Section 6.2) This is the best method for achieving the required speed variations, not from the point of view of quicker and smoother speed variations, but of total energy conservation even at low outputs. 

Tbe use of special motors was more relevant until the 1980s. when solid-state technology was still in its infancy and wa.s not so widely applied. With the advent of static drives, as discus.sed in Sections 6.2-6.4, the use of standard motors is gradually becoming more common for all these applications. The drive it.self can alter the supply parameters to the required level to make a standard motor operate and perform within desired parameters, besides conserving energy. The purpose of describing a few of these applications is only to indicate their non-standard features, where a standard motor with normal controls may not be able to perform the required duties. 

With application of solid-state technology, this shortcoming of an electromagnetic relay is automatically overcome. The solid-state relays are available with switching stages as many as from 2 to 16. For special applications, they can be designed for even higher numbers of steps. 

This part-also deals w ith static controls and drives, soft starting and process control through solid-state technology (phasor and field-oriented controls) using IGBTs as well as energy conservation,... 

Solid-state synthesis, of polyimides, 304 Solid stating technology, 530 Solid waste disposal, 27 Solubility, 3... 

Rainer, D., et al., HI-V Transient Hydride Generation, Solid State Technology, pp. 35 0 (June 1993)... 

Maaeda, K., andFisher, S., CVD TEOS/O3 Development Hi story and Applications, Solid State Technology, pp. 83-88 (June... 

Drexel, C. F., Digital Mass Flow Controller Come of AgeJ Solid State Technology, pp. 99-106 (Nov. 1996)... 

Sullivan, L. A., and Bin Han., Vapor Delivery Methods for CVD, An Equipment Selection GmdQ, Solid State Technology, pp. 91-101 (May 1996)... 

Horn, M. W., Antireflection Layers and Planarization for Microlithography, Solid State Technology, pp. 57-62 (Nov. 1991)... 

Taylor, P. A., Silicon Source Gases for Chemical Vapor Deposition f Solid State Technology, pp. 143-138 (May 1989)... 

Roberts, B., Harms, A., and Jackson, R., Interconnect Metallization for Future Device Generations, Solid State Technology, pp. 69-78 (Feb. 1995)... 

Seebauer, C. G., and Ditchfield, R., Fixing Hidden Problem with Thermal Budget, Solid State Technology, pp. 111-120 (Oct. 1997)... 

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