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This paper introduces a new methodology for analysis of faults in induction motors based on MCSA using the Fast Fourier Transform (FFT). The report describes the methodology used for determining the exact amplitude of the harmonic fault, regardless of the sampling time used, thus making data acquisition and subsequent analysis easier. Another advantage of this method is that it only needs for its implementation the measurement of the stator current.

Non-member Dealing with position control of Linear Induction Motors (LIM), most strategies in bibliography are based on Secondary Flux Oriented Control (SFOC) and Direct Thrust Control (DTC). However, SFOC of linear induction motors needs complex identification methods to compensate parameter variation during operation, mainly due to local heating and end-effects. On the other hand, DTC based methods for LIMs present thrust ripple and have problems at low and zero speeds. In this paper, a new Indirect Thrust Control (ITC) based strategy for position control of linear induction motors that makes up for these drawbacks is presented. The position control loop design methodology and the method for automatic adjustment of compensators are described. Experimental results are presented to evaluate the performance and sensitivity of the control strategy. Finally, some conclusions are drawn about the applicability of the new algorithm that demonstrate the main advantages versus SFOC and DTC.

Non-member This paper analyses the dynamic performance of flat single-sided Permanent Magnet Linear Synchronous Motors (PMLSMs) employed as actuators, when the alternate motion and the attractive or repulsive forces between the primary and the secondary are controlled simultaneously. The control of the normal forces when the motor is in dynamic operation provides multiples advantages, such as the reduction of friction forces and audible noise, and the minimization of mechanical stresses of guides and supports. Two PMLSM prototypes, one with a ferromagnetic primary core, and another with a non-magnetic armature, were tested under these special operation conditions. A modified Rotor Flux Oriented Control (RFOC) strategy was employed to carry out the tests, and several conclusions were taken. The main purposes of this study are to show the feasibility of the simultaneous control of motion and normal forces employing vector control techniques and to analyse the dynamic response of the prototypes.