By Werner Leonhard
Electric drives play a massive half as electromechanical power converters in transportation, fabrics dealing with and so much construction techniques. This ebook offers a unified therapy of entire electric force structures, together with the mechanical components, electric machines, and gear converters and controls. because it used to be first released in 1985 the publication has stumbled on its method onto many desks in and universities around the globe. For the second one version the textual content has been completely revised and up to date, with the purpose of supplying the reader a common view of the sector of managed electric drives, that are holding and lengthening their significance because the so much versatile resource of managed mechanical power. Fachgebiet: electric Engineering Zielgruppe: learn and improvement
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Extra info for Control of Electrical Drives
The discontinuity of the motor torque is caused by the omission of the electrical transients. In reality the torque is also associated with energy states and, hence, is continuous. 30 3. Integration of the Simplified Equation of Motion OJ Fig. 5. 2 Starting the Motor with a Load Torque Proportional to Speed In Fig. 5 the curves of a drive with speed-proportional load torque are displayed. The steady state operating point is now at Wl < Wa, hence LlW(O) = -Wl. 11) Elimination of speed from the motor characteristic Eq.
This is the usual solution with highly pulsating loads such as punching presses. 3 Periodic Intermittent Duty With some types of load, for example elevators, automatic machine tools, mine hoists or rolling mill drives typical load cycles exist which are repeated periodically. A very simple case is seen in Fig. 5, where the power loss Pii follows a rectangular periodic pattern. t? '(O) 0 t1 t1+t2 2(t1+t2) Fig. 5. Thermal transients for intermittent duty This results in temperature fluctuations, the mean of which rises until a steady state condition is reached.
9. In bearings, gears, couplings and brakes we observe dry or Coulomb friction (a), which is nearly independent of speed; however one has to distinguish between sliding and sticking friction, the difference of which may be considerable, depending at the roughness of the surfaces. The forces when cutting or milling material also contain Coulomb type friction. 4 Stable and Unstable Operating Points 23 called viscous friction (b). At very low speed and without pressurised lubrication, Coulomb type friction again appears.