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  • Dc motor impersonators
    , during a 2 motor speed increase. The curve duplicates the armature current for a dc motor performing the same operation. The net effect provides dc motor control response for ac induction motors. Synchronous dc motors often top the field in high-performance motor controls. This group of motors includes
  • The Drive for Simplicity: Defining Trends in Motor Drives
    By Ilpo Ruohonen, Mika Paakkonen, Mikko S. Koskinen ABB offers one of the world's largest portfolios of AC drives, serving an expanding horizon of applications. With increasing demands for flexibility, reliability and ease of use, ABB has come up with a number of solutions to make life simpler
  • Medical Device Link . Technology news
    A series of injection moulding machines driven by ac motors offers significant improvements in energy efficiency. The EC-series moulding machines use separate ac servomotors for each machine function. When a function is completed or the machine is idle between cycles, the motors are shut off
  • Servo On A Chip
    Control of ac servomotors can now take place on a single IC. Digital Control IC Design Center Circuitry for handling highperformance control of ac servos has been condensed onto one chip in the IRMCK201. There is an incentive to control motor speed in a widening array of applications. Technological
  • US Dynamics Rate Gyroscope Interface Brief
    inputs: 1. Spin motor excitation. Spin motor excitation provides the electrical power required to start and maintain the speed of the gyroscope spin motor, which is a synchronous induction, hysteresis type. Required here is a two phase AC signal, where the two phases are 90 electrical degrees displaced
  • Hybrids
    Power-circuit modules containing several power semiconductor switching devices can reshape ac power into other required forms and often have current ratings from 30 to 50 A. The semiconductor elements in these devices are usually SCRs or triacs and are glass passivated and mounted on a copper-clad
  • Electronic monitoring relays
    a dialed-in level longer than a delay time the user has also set. The relay switches off once current drops back to allowable levels. In recent years, monitoring relays have also found roles where ac power quality is suspect. Here specific models may be used to signal over or under-voltage coming from

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