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Electrical MachinesDC-Machines

Electrical Machines: DC-Machines 2 DC-Machines 2.1 Principle Construction Figure 2.1 shows a photograph of an open cut DC-machine, where all relevant parts are described. rotor iron stack brush and bearing bracket brush holder bearing commutator axis housing magnet winding Fig. 2.1. Photograph of a DC-machine. The principle construction of a DC-machine is like follows: The stationary part (called “stator“) mostly is composed of massive iron (to lead the magnetic flux). A stationary magnetic field with changing polarity is gen- erated, either by permanent magnets (see Fig. 2.1) or by salient poles having coils with DC-currents. The movable part (called “rotor“) - separated from the stator by an air-gap - is composed of an iron stack made from laminations, in whose slots coils made from copper are placed. These coils are connected with the clamps of the commutator segments. On the commutator the carbon brushes are sliding, so that the current is supplied from the stationary terminals to the rotating coils. By this commutator the supplied DC-current permanently changes direction in the rotor in such a way, that the current in the rotor coils below a permanent mag- net pole of the stator always flows in the same direction (under the magnet pole http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png

Electrical MachinesDC-Machines

Part of the Mathematical Engineering Book Series (volume 4)
Gerling, Dieter
Electrical Machines — Sep 4, 2014
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Publisher
Springer Berlin Heidelberg
Copyright
© Springer-Verlag Berlin Heidelberg 2015
ISBN
978-3-642-17583-1
Pages
37 –88
DOI
10.1007/978-3-642-17584-8_2
Publisher site
See Chapter on Publisher Site

Abstract

2 DC-Machines 2.1 Principle Construction Figure 2.1 shows a photograph of an open cut DC-machine, where all relevant parts are described. rotor iron stack brush and bearing bracket brush holder bearing commutator axis housing magnet winding Fig. 2.1. Photograph of a DC-machine. The principle construction of a DC-machine is like follows: The stationary part (called “stator“) mostly is composed of massive iron (to lead the magnetic flux). A stationary magnetic field with changing polarity is gen- erated, either by permanent magnets (see Fig. 2.1) or by salient poles having coils with DC-currents. The movable part (called “rotor“) - separated from the stator by an air-gap - is composed of an iron stack made from laminations, in whose slots coils made from copper are placed. These coils are connected with the clamps of the commutator segments. On the commutator the carbon brushes are sliding, so that the current is supplied from the stationary terminals to the rotating coils. By this commutator the supplied DC-current permanently changes direction in the rotor in such a way, that the current in the rotor coils below a permanent mag- net pole of the stator always flows in the same direction (under the magnet pole

Published: Sep 4, 2014

Keywords: Terminal Voltage; Rotor Current; Motor Operation; Circulation Path; Pole Pitch

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