Category: Armature Windings

Construction and Working of DC Machine

Construction and Working of DC Machine: A Construction and Working of DC Machine is a heteropolar structure with stationary poles and the rotating armature (Fig. 5.8). DC Machine Basic Structure: An alternating emf of the same wave shape as that of B-wave is induced in every coil. As the armature rotates, the emf s induced […]

Tooth Ripple

Tooth Ripple: Because of lower reluctance of the magnetic path corresponding to the teeth as compared to the slots, the flux density wave in the air-gap is ripple as shown in Fig. 6.9. Unlike the space harmonics of the B-wave which move at the same peripheral speed as the fundamental, the tufts of flux embracing […]

AC Winding

AC Winding: Ac winding are generally of a 3-phase kind because of the inherent advantages of a 3-phase machine. The armature coils must be connected to yield balanced (equal in magnitude and successive phase difference of 2π/3 rad) 3-phase emfs. To begin with the slots around the armature periphery must be divided into phase-bands. Phase […]

Types of Armature Winding

Types of Armature Winding: We Know that field and Armature Winding Machine are the essential features of electric machines. The field windings are simple arrangements with concentrated coils (i.e coils in which all the turns have the same magnetic axis). Types of Armature Winding Machine on the other hand comprise a set of coils (single […]