Control of Electrical Drives

Description

Electrical drives play an important role as electromechanical energy convert­ ers in transportation, material handling and most production processes. The ease of controlling electrical drives is an important aspect for meeting the in­ creasing demands by the user with respect to flexibility and precision, caused by technological progress in industry as well as the need for energy conser­ vation. At the same time, the control of electrical drives has provided strong incentives to control engineering in general, leading to the development of new control structures and their introduction to other areas of control. This is due to the stringent operating conditions and widely varying specifications - a drive may alternately require control of torque, acceleration, speed or position - and the fact that most electric drives have - in contrast to chem­ ical or thermal processes - well defined structures and consistent dynamic characteristics. During the last years the field of controlled electrical drives has undergone rapid expansion due mainly to the advances of semiconductors in the form of power electronics as well as analogue and digital signal electronics, eventu­ ally culminating in microelectronics and microprocessors. The introduction of electronically switched solid-state power converters has renewed the search for adjustable speed AC motor drives, not subject to the limitations of the mechanical commutator of DC drives which dominated the field for a century. Front Matter ....Pages I-XVIII Introduction (Werner Leonhard)....Pages 1-5 Some Elementary Principles of Mechanics (Werner Leonhard)....Pages 7-15 Dynamics of a Mechanical Drive (Werner Leonhard)....Pages 17-28 Integration of the Simplified Equation of Motion (Werner Leonhard)....Pages 29-42 Thermal Effects in Electrical Machines (Werner Leonhard)....Pages 43-50 Separately Excited DC Machine (Werner Leonhard)....Pages 51-68 DC Motor with Series Field Winding (Werner Leonhard)....Pages 69-76 Control of a Separately Excited DC Machine (Werner Leonhard)....Pages 77-96 Static Converter as a Power Actuator for DC Drives (Werner Leonhard)....Pages 97-138 Control of Converter-supplied DC Drives (Werner Leonhard)....Pages 139-162 Symmetrical Three—Phase AC Machines (Werner Leonhard)....Pages 163-214 Power Supplies for Adjustable Speed AC Drives (Werner Leonhard)....Pages 215-240 Control of Induction Motor Drives (Werner Leonhard)....Pages 241-301 Induction Motor Drive with Reduced Speed Range (Werner Leonhard)....Pages 303-328 Variable Frequency Synchronous Motor Drives (Werner Leonhard)....Pages 329-362 Some Applications of Controlled Electrical Drives (Werner Leonhard)....Pages 363-401 Back Matter ....Pages 403-460