By Andrzej M. Trzynadlowski
This e-book is a entire reference resource for training engineers and scholars focusing on electrical strength engineering and business electronics. it's going to illustrate the state-of-the-art in induction cars. starting with features and uncomplicated dynamic versions of induction automobiles, and progressing to low- and excessive- functionality force platforms. The publication should be wealthy in valuable info, with out an over the top mathematical burden. laptop simulations leading to mock oscillograms of actual amounts are used for representation of easy keep watch over strategies. The content material of this e-book is split into 3 uncomplicated elements: 1) control-oriented description of induction automobiles, 2) keep watch over tools, and structures, three) regulate capability. An induction motor is gifted as an electromechanical energy converter, and uncomplicated relatives among undefined, magnetic and mechanical amounts within the motor may be defined. keep an eye on tools and platforms can be labeled based on the managed variables(torque, velocity, 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 fashionable induction motor drives is integrated. Such systematic process will provide the readers a entire assessment of the sector of induction motor keep an eye on.
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Additional resources for Control of Induction Motors (Electrical and Electronic Engineering) (Engineering)
The total heat produced in the rotor is approximately three times the initial energy of the drive system. Therefore, plugging must be employed with caution to 48 CONTROL OF INDUCTION MOTORS avoid thermal damage to the rotor. 17) are the best candidates for effective plugging. 1 To illustrate braking by plugging, consider the example motor driving a load under rated operating conditions. The mass moment of inertia of the load is twice that of the motor. The initial braking torque and total energy dissipated in the rotor by the time the motor stops are to be determined.
Plugging is a good option for motors running light, while simply disconnecting the motor from the power line can be sufficient for quick stopping of drives with a high reactive load torque. In some drives, the reversing is performed in the gear train so that the motor operation is not affected. 4 POLE CHANGING A formula for speed, nM, of the induction motor as a function of the supply frequency, f, number of pole pairs, pp, of the magnetic field, and slip, s, of the motor can be obtained from Eqs.
Analysis of the steady-state operation of the induction motor is based on the per-phase equivalent circuit. The mechanical load of the motor is modeled by the equivalent load resistance. The developed torque resulting from interaction between the field and rotor currents strongly depends on the slip. It can be calculated as a ratio of power dissipated in equivalent load resistances of all three phases of the motor to the angular velocity of the rotor. The torque reaches a maximum value, the pull-out torque, at a speed lower than rated.