Use this resource - and many more! - in your textbook!
AcademicPub holds over eight million pieces of educational content for you to mix-and-match your way.
Extended high-speed operation via electronic winding-change method for AC motors
By: Morimoto, S.; Maemura, A.; Kume, T.; Swamy, M.M.;
2006 / IEEE
This item was taken from the IEEE Periodical ' Extended high-speed operation via electronic winding-change method for AC motors ' In many applications, it is often needed to extend the speed range of an electric motor. In permanent-magnet ac motors (PMAC), the maximum speed is limited by the available voltage for a given counter electromotive force value. The extension of the speed range can be achieved to some extent by using the field-weakening principle, resulting in constant-power characteristics, but is limited by machine parameters and inverter rating. In an induction-motor-based spindle drive for machine-tool applications, the wye/delta switchover method remains popular for extending the constant-power range without sacrificing the torque capability at higher speeds. Conventionally, the wye/delta method employs mechanical contactors that have limited life and are associated with dead time in the range of tens to hundreds of milliseconds due to mechanical constraints. Power-electronic versions of the contactors have been proposed, but they are rather complicated and involve many switching devices. This paper describes a novel and simple switching technique involving only two three-phase diode bridges and two insulated gate bipolar transistor (IGBT) switches to extend the speed range of ac machines (induction as well as permanent-magnet type). The proposed method requires a center tap to be placed in each phase of the motor with access to the ends and the center tap, making the motor a nine-lead machine. Test results carried out on a nonsalient-type PMAC motor and an induction motor are given to support the idea.
Power Semiconductor Switches
Electronic Winding-change Method
Permanent Magnet Ac Motors
Wye-delta Switchover Method
Three-phase Diode Bridge
Insulated Gate Bipolar Transistor Switches
Insulated Gate Bipolar Transistors
Permanent Magnet Motors
Signal Processing And Analysis
Power, Energy And Industry Applications
Induction Motor Based Spindle Drive