Electrical Drives: Principles, Planning, Applications, by Jens Weidauer, Richard Messer

By Jens Weidauer, Richard Messer

From the perspective of a consumer this publication covers all facets of recent electric drives. it's aimed 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 review of electric drives.
Jens Weidauer and Richard Messer describe the foundations of electric drives, their layout, and alertness, via to complicated automation recommendations. within the approach, they introduce the whole spectrum of force options on hand and their major functions. a unique element is the mix of a number of drives to shape a force approach, in addition to the mixing of drives into automation solutions.
In basic and transparent language, and supported with many diagrams, advanced relationships are defined and provided in an easy-to-understand means. The authors intentionally stay away from a finished mathematical therapy in their topic and in its place concentrate on a coherent description of the lively rules and relationships. therefore, the reader should be able to comprehend electric drives as an entire and to resolve drive-related difficulties in daily specialist existence.

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

Sample text

In motors with an excitation winding, the air-gap flux can be reduced Air-gap flux/exciby adjusting the excitation current. By reducing the excitation, the no- tation current load speed increases and the load-dependent speed reduction increases. Reducing the speed of a lightly loaded motor is therefore only possible by significantly increasing the excitation current. However, as the iron in the magnetic circuit of the motor would rapidly go into saturation, increasing the excitation current would not lead to the expected increase in the air-gap flux.

2 Developing torque In linear components, the relationship between the current and voltage Linear can be described using a linear equation or linear differential equation. components In non-linear components, the relationship between the current and Non-linear voltage can, in its simplest form, be represented by a characteristic components curve. In electrical drives non-linear components are mostly used to describe the power semiconductors in the controllers. As the power semiconductors in electrical drives are usually used as switches to switch the current on and off, the characteristic curves of these components can be very much simplified.

4 The right-hand rule ing conductor. If the conductor is not mechanically fixed, then it will move according to the acting force. This effect is put to use to develop torque in electric motors. The strength of the Lorentz force is proportional to Strength of the Lorenz force • the strength of the magnetic field, as well as • the speed and number of charged particles moved and therefore the strength of the electric current. This completes the overview of the most important factors responsible for developing a large torque in an electric motor.

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