Solid-state technology control

McIntyre, A. J., Shetin, B. J., Gallium Arsenide Hazards, Assessment, and Control, Solid State Technology, 32(9) 119-126 (1989)... 

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

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. 

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. 

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,... 

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

Armstrong, R. J. Laminating control system, Solid State Technology, p. 50, Nov. 1969... 

The galvanic cell studied (shown in Fig. 5.24) utilizes a highly porous solid electrolyte that is a eutectic composition of LiCl and KCl. This eutectic has a melt temperature of 352 °C and has been carefully studied in prior electrochemical studies. Such solid electrolytes are typical of thermal battery technology in which galvanic cells are inert until the electrolyte is melted. In the present case, shock compression activates the electrolyte by enhanced solid state reactivity and melting. The temperature resulting from the shock compression is controlled by experiments at various electrolyte densities, which were varied from 65% to 12.5% of solid density. The lower densities were achieved by use of microballoons which add little mass to the system but greatly decrease the density. 

The first demonstration of solid state fluorescence of API dates back to 1961, while its in-line use for final drug product manufacturing was not demonstrated until recently." While in its infancy as a process analytical technology for real-time monitoring and product parametric real-time release, the applications identified and in some instances demonstrated include (i) blend endpoint API content nniformity detection " (ii) segregation monitoring or API content at various process critical control points and (iii) at-line tablet content uniformity determination. The fundamentals of solid-state luminescence spectroscopy for pharmaceutical solids has been covered by Brittain."... 

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