scholarly journals Solid State A-C Variable Speed Drives

1977 ◽  
Author(s):  
John D. Zak
Keyword(s):  
Solid State ◽  
High Performance ◽  
Hydraulic Systems ◽  
Variable Speed Drives ◽  
Pwm Inverter ◽  
Pulse Width Modulated ◽  
Design Concepts ◽  
Industrial Drive ◽  
Adjustable Speed ◽  
Drive Systems

Solid state adjustable-speed a-c drives offer a new era in high performance, maintenance-free, industrial drive systems. Whether applying a solid state adjustable-speed a-c drive to a new application or a retrofit to a fixed frequency drive there will be recognized unique advantages, both economically and from this standpoint of performance. Since its’ introduction in the mid 1960’s the pulse width modulated (PWM) inverter has offered a number of significant advantages over hydraulic systems and other inverter types for low and medium frequency applications. With the advent of the fast turn-off thyristors and advances in PWM modulator techniques, the PWM now offers distinct application advantages to 200 Hz. PWM design concepts are analyzed, with a comparison of different types of inverters are discussed. Paper published with permission.

Fundamentals of Solid-State AC Variable-Speed Drives

1969 ◽  
Vol 6 (01) ◽  
pp. 76-82
Author(s):  
Donald L. Schoen
Keyword(s):  
Solid State ◽  
High Performance ◽  
Practical Implementation ◽  
Variable Speed ◽  
Variable Speed Drives ◽  
Ac Drive ◽  
Ac Motor ◽  
Economic Trends ◽  
History Of ◽  
Drive Systems

Solid-state ac variable-frequency drives offer a new generation of high-performance, maintenance-free drive systems. The desire to use the rugged ac motor as a high-performance, variable-speed device goes back many years; however, its practical implementation had to wait three-quarters of a century for development of the silicon controlled rectifier. This paper opens with a brief review of the history of variable-speed dc and ac drive systems. Then the fundamentals of solid-state ac variable-speed drives are presented with emphasis on future technical and economic trends. The ac system is evaluated as an economic solution to providing basic functional drive requirements. The characteristics are compared with traditional high-performance dc systems. Finally, an attempt is made to describe the solid-state ac variable-speed drive of the future.

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