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- W75889247 abstract "The problem here analysed concerns the drives providing the use of high speed induction motors. There is an increasing tendency to use this type of motors (having rated frequencies comprised between some hundreds and some thousands hertz) for those applications requiring the utilization of grinding and milling machines. In such cases the supply can be constituted by a square wave static inverter and closed loop speed regulation is often not necessary. For such reasons and other discussed in the paper, the starting of these motors is normally realized through the adoption of an open-loop ramp in the supply voltage and frequency. During the starting, transient current overloads may occur caused by a too fast increasing of the supply voltage and frequency; that may be even more verified, owing to the wide spread of the parameters concerning the motors that a given inverter is required to drive; of particular importance is often also the friction torque due to the bearings. The starting transient is considered as the more significant among all the other situations for which a variation in the shaft speed is necessary. The current overloads may cause different types of trouble: for instance the intervention of the maximum current protection, which is often present in such a type of drives. In the paper the starting transient are studied through a suitable dynamic model of the drive and a simple method for altering the starting characteristics of the system is proposed and analysed. The method is based on the alteration of the frequency variation rate, when the motor current exceed a given limit. Such adaptive control, for which a motor current feedback has to be provided, allows to increase the starting time only when it is necessary, leaving the speed transient conform to the present ramp in the other cases. The prediction of the quantitative effect of the technique are very interesting; experimental and simulation results allow to better clarify the terms of the problem and the obtainable results." @default.
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- W75889247 date "1983-09-01" @default.
- W75889247 modified "2023-10-17" @default.
- W75889247 title "High-Speed Induction Motor Drives: Starting Operation Control" @default.
- W75889247 doi "https://doi.org/10.1016/s1474-6670(17)61889-5" @default.
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