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close this bookElectrical Machines - Basic Vocational Knowledge (IBE - Deutschland; 144 pages)
View the documentIntroduction
Open this folder and view contents1. General information about electrical machines
Open this folder and view contents2. Basic principles
Open this folder and view contents3. Execution of rotating electrical machines
close this folder4. Synchronous machines
Open this folder and view contents4.1. Operating principles
close this folder4.2. Constructional assembly
View the document4.2.1. Stator
View the document4.2.2. Rotor
Open this folder and view contents4.3. Operational behaviour
Open this folder and view contents4.4. Use of synchronous machines
Open this folder and view contents5. Asynchronous motors
Open this folder and view contents6. Direct current machines
Open this folder and view contents7. Single-phase alternating current motors
Open this folder and view contents8. Transformer

4.2.1. Stator

Synchronous machines may be either inner or external pole machines (Cp Figure 9). As direct current power required for excitation is relatively small as compared to alternating current energy, it is more economical to feed the rotors via slip rings with direct voltage. Alternating voltage can then be fed through permanent terminals, resp. tapped off. For this reason inner pole machines are generally manufactured.

Synchronous machines are mainly inner pole machines.

The stand of the inner pole machine comprises a steel casing containing a lamella pack with magnetically high-grade iron.

The windings are housed in the inner-positioned grooves. In the case of the single-phase machine these are distributed around some two thirds of the total circumference whereas, in the case of a three phase synchronous machine, three coils have each been displaced spatially within 120 degrees.

Figure 37 - Stator winding of a two-pole inner-pole synchronous machine Legend as for Figure 35

Figure 38 - Stator winding of a four-pole inner-pole synchronous machine

L1; L2; L3 Three-phase conductor
N Neutral conductor
4 Star point 1.1. to 3.2. as for Figure 35
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