Aiming at the ultra high speed permanent magnet synchronous motor (PMSM) supported by gas foil bearings (GFBs), this paper calculates the transient line starting of the motor. Firstly, the start effect of the rotor composed of cylindrical PM and stainless steel sleeve is studied. Then, in order to enhance the start torque, copper ring, nickel ring and copper squirrel-cage are introduced in the ...

Rotor dynamics plays an important role in many engineering fields such as gas turbine, steam turbine, reciprocating and centrifugal compressors, the spindle of machine tools, and so on. Owing to the growing demands for high power, high speed, and light weight of the rotor-bearing system, computations of critical speeds and steady-state response at synchronous and sub critical resonances become ...

This paper is concentrated mainly to the cause and to clear the Power Swings in synchronous generator due to rotor speed oscillations in wind farm which is a distributed generation to maintain the stability of rotor oscillations. The paper presents different conditions of disturbances and faults in specified time period. In Power System Damping Oscillation modes are excited due to disturbance i...

A discrete-time sliding mode with block control aided design is applied to a nonlinear discrete-time induction motor model where the load torque is considered as unknown perturbation. With full state measurements, both rotor speed and rotor flux amplitude tracking objectives are satisfied. Then, a reduced order observer is implemented where speed and current measurements provide the observation...

This paper focuses on the so-called sensorless speed-tracking control for permanent magnet synchronous motors. A control strategy is proposed allowing to extract rotor position using electrical signals and an observer of electrical variables, and to guarantee the robust asymptotical tracking of a reference speed without measuring rotor velocity and position. Bounded parameter variations are sup...

The paper presents a novel secondary reactance control technique in the rotor circuit of a three phase wound rotor induction motor (WRIM). The problem associated with the conventional rotor capacitive reactance control is the demand of exceptionally large capacitance requirement for enhancing the performance of the motor in wide operating range. In the proposed technique, a three phase bridge r...

Doubly fed wound rotor induction machine with vector control is very attractive to the high performance, variable speed drive and generating applications[ 1-31. In variable speed drive application, the so-called slip power recovering scheme is a common practice where the power due to the rotor slip belowlabove synchronous speed is recovered to/supplied from the power source, resulting a high ef...

This paper presents the design of digital controller for a BLDC motor to control the speed and position control using Digital Signal Processor (DSP) TMS320LF 2407 which is used in an Electromechanical Actuator. Brushless D.C motor (BLDC) are one of the motor types rapidly gaining popularity. This motor offer a simple and rugged motor Solution for many variable speed drive application. Rotation ...

In this short paper we present a discrete-time eld oriented controller (FOC) for current-fed induction motors which insures global asymptotic speed regulation as well as rotor ux norm tracking. To the best of our knowledge, this is the rst time such a result is rigourously established for a controller implemented in discrete-time. To insure global stability a condition on the reference for the ...