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- W325001087 abstract "The applications of robust squirrel-cage induction motorsin variable speed inverter drive systems have increasedconsiderably due to the availability of easily controlledsemiconductor switching devices. One problem encountered ininverter drives is the non-sinusoidal nature of the supplyvoltage, which results in increased motor losses and harmfultorque pulsations producing undesirable speed oscillations.The latter effects are negligible at high frequency operation,due to the damping effect of the rotor and load inertia.However, torque pulsations and speed ripple may be appreciableat low frequency, wore they may result in abnormal wear ofgear-teeth or torsional shaft failure. Hence, in applicationswhere constant or precise speed control is important, eg;machine tool, antenna positioning, traction drives etc., itis essential to establish a method for determining themagnitudes of these torque pulsations and speed ripple, as afirst stage in minimizing or eliminating them.When a voltage source inverter is used in such applications,pulse width modulation (PWM) techniques are usually employed,whereby the quasi square waveshape is modulated so as tominimize or eliminate the low order harmonic voltage componentsand thereby reduce the torque pulsations. Recent investigationshave shown that total elimination of low order components doesnot produce optimal efficiency or torque pulsations and speedripple. minimization. This thesis describes new PWM strategieswhich does not rely on complete elimination of low orderharmonics, but on controlling the magnitude and phase of thesecomponents to achieve a smooth rotor motion.Initially, a mathematical model for the inverter/inductionmotor drive was developed, based on numerical integration ofthe system differential equations. The changing topology ofthe inverter bridge was simulated using tensor techniques.Then an analytical method, based on harmonic equivalent circuitanalysis was proposed for calculating the induction motor pulsating torque components under steady-state operatingconditions, in terms of stator and rotor current harmonics.The accuracy of this method was verified by comparing itsresults with those obtained from the mathematical modeldeveloped earlier. This provided an extremely rapid,numerically stable and efficient means for evaluating harmoniccurrent and torque components with balanced non-sinusoidalapplied voltages. This method was then used to formulate thetorque performance function necessary to determine the newoptimal PWM switching strategies.Throughout the work, the predicted performance wasextensively validated and supported by practical resultsobtained from an experimental rig specifically designed todrive the machine under different PWM techniques." @default.
- W325001087 created "2016-06-24" @default.
- W325001087 creator A5003669041 @default.
- W325001087 date "1991-01-01" @default.
- W325001087 modified "2023-09-26" @default.
- W325001087 title "New optimal PWM strategies for a VSI induction motor drive" @default.
- W325001087 hasPublicationYear "1991" @default.
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