By Jens Weidauer, Richard Messer

From the perspective of a consumer this e-book covers all points of contemporary electric drives. it's geared toward either clients, who desire to comprehend, layout, use, and retain electric drives, in addition to experts, technicians, engineers, and scholars, who desire to achieve a accomplished evaluation of electric drives.
Jens Weidauer and Richard Messer describe the rules of electric drives, their layout, and alertness, via to complicated automation options. within the procedure, they introduce the complete spectrum of force recommendations on hand and their major purposes. a distinct point is the combo of a number of drives to shape a force process, in addition to the combination of drives into automation solutions.
In basic and transparent language, and supported with many diagrams, advanced relationships are defined and awarded in an easy-to-understand approach. The authors intentionally keep away from a complete mathematical therapy in their topic and as an alternative concentrate on a coherent description of the lively rules and relationships. hence, the reader should be capable of comprehend electric drives as an entire and to unravel drive-related difficulties in daily specialist lifestyles.

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Extra info for Electrical Drives: Principles, Planning, Applications, Solutions

Example text

As thyristors can only conduct current in one direction, the current flow is 1. starting from a supply phase (in the Figure L1) 2. e. conducting, thyristor in the upper half-bridge (in the Figure T1) 3. continuing via the motor 4. continuing via a triggered thyristor in the lower half-bridge (in the Figure T6) 5. and back to another supply phase (in the Figure L3). Two supply phases and each one thyristor from the upper half-bridge and lower half bridge are therefore always participating in the current flow.

4 Variable-speed drives using DC motors The following rule applies: A positive excitation current and a positive armature current generate a positive torque and accelerate an unloaded motor in the positive direction (clockwise when looking at the motor shaft). A negative excitation current and a negative armature current also generate a positive torque and also accelerate an unloaded motor in the positive direction. If the polarities of the excitation and armature currents are different, then an unloaded motor will accelerate in the negative direction.

18 Circuit configuration of a DC motor with series-wound characteristic Of particular interest here is that the armature current flows through the excitation winding. The resulting magnetic field in the motor is no longer constant, but dependent on the motor load. This leads to the characteristic operating behaviour of the series-wound motor. 19). Series-wounds motors respond very “soft” to changes in load. Under no-load conditions, only the remanent flux of the motor is active. The air-gap flux is very small, and not until the motor speed is very high does it induce a motor voltage Vm large enough to compensate the armature voltage Va.

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