By Andrzej M. Trzynadlowski
This booklet is a accomplished reference resource for practising engineers and scholars focusing on electrical strength engineering and business electronics. it is going to illustrate the cutting-edge in induction automobiles. starting with features and simple dynamic types of induction cars, and progressing to low- and excessive- functionality force platforms. The ebook might be wealthy in invaluable details, with out an over the top mathematical burden. laptop simulations leading to mock oscillograms of actual amounts are used for representation of simple regulate ideas.
The content material of this publication is split into 3 easy components: 1) control-oriented description of induction cars, 2) regulate tools, and structures, three) regulate skill. An induction motor is gifted as an electromechanical energy converter, and easy family among undefined, magnetic and mechanical amounts within the motor might be defined. keep an eye on tools and structures may be categorized in keeping with the managed variables(torque, pace, flux), actuating variables(voltage, current), and dynamic functionality (uncontrolled, low-performance, and high-performance). an summary of energy digital converters and knowledge processing apparatus utilized in the trendy induction motor drives is incorporated. Such systematic technique will supply the readers a finished evaluate of the sphere of induction motor keep an eye on.
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Extra info for Control of Induction Motors, 1st Edition
16. Except for very low supply frequencies, the magnetizing reactance is much higher than the stator resistance and leakage reactance. Thus, shifting the magnetizing reactance to the stator terminals of the equivalent circuit does not significantly change distribution of currents in the circuit. 17) denotes the total leakage reactance. When Ir, given by Eq. 16), is substituted in Eq. 12), after some rearrangements based on Eqs. 5 pp 2 V ƒ s ͩ Rr s ͪ R Rs ϩ r s . 18) X2l The quadratic relation between the stator voltage and developed torque is the only serious weakness of induction motors.
Thus, shifting the magnetizing reactance to the stator terminals of the equivalent circuit does not significantly change distribution of currents in the circuit. 17) denotes the total leakage reactance. When Ir, given by Eq. 16), is substituted in Eq. 12), after some rearrangements based on Eqs. 5 pp 2 V ƒ s ͩ Rr s ͪ R Rs ϩ r s . 18) X2l The quadratic relation between the stator voltage and developed torque is the only serious weakness of induction motors. Voltage sags in power lines, quite a common occurrence, may cause such reduction in the torque that the motor stalls.
For instance, when a two-pole stator is reconnected to fourpole operation, the resulting pull-out torque can be the same as before (constant torque connection), half of its previous value (square-law torque connection), or twice its previous value (constant power connection). Clearly, these three types of torque-speed relationship are most suitable for loads with the constant, positive, and negative coefficient k in Eq. 1). 5 ABNORMAL OPERATING CONDITIONS Abnormal operation of an induction motor drive may be caused by internal or external problems.