Rotating Machines

Armature Winding in DC Machine

DC Machine

Armature Winding in DC Machine: With reference to the single-coil elementary Armature Winding in DC Machine of Figs 5.13 and 5.14(a) which shows the B-wave of the machine relative to the elementary full-pitched coil, LetConsider that the coil is lying in the interpolar region so that the full flux/pole (Φ) links it positively. Let it […]

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Short Pitch Coil or Chorded Coil

Short Pitched Coils

Short Pitch Coil or Chorded Coil: Short Pitch Coil – So far it was assumed that the stator coils are full-pitched (a span of π rad elect). Coils may have a span of less than the full-pitch. This arrangement offers certain advantages. Consider that the coil-span is less than the full-pitch by an elect. angle

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EMF Equation of AC Winding

Generated Voltage of ac Winding

EMF Equation of AC Winding: The B-wave of a EMF Equation of AC Winding synchronous machine (in general multi-polar) assumed sinusoidal is drawn in Fig. 5.15 and a single full-pitched coil (coil-side space separation π rad (180°) elect.) is shown in cross-sectional form. The B-wave moves towards left with a speed of ω elect. rad/s

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2 Pole Elementary DC Machine

DC Machine

2 Pole Elementary DC Machine: Figure 5.13 shows a 2 Pole Elementary DC Machine with a single coil rotating armature. It may be seen that the field winding is stationary with salient poles whose pole-shoes occupy a major part of the pole-pitch. An alternating emf is induced in the coil due to rotation of the

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Three Phase Synchronous Generator

Three-phase Generator (Alternator)

Three Phase Synchronous Generator: Practical synchronous generators are always of the 3-phase kind because of the well-known advantages of a 3-phase system. If two coils were located at two different space locations in the stator of Fig. 5.2, their emfs will have a time phase difference corresponding to their electrical space displacement. In Three Phase

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Rotating Electrical Machines

Rotating Electrical Machines

Rotating Electrical Machines: We Know that electromechanical energy conversion takes place whenever a change in flux is associated with mechanical motion. Speed voltage is generated in a coil when there is relative movement between the coil and magnetic field. Alternating emf is generated if the change in flux linkage of the coil is cyclic. The

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