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Construction of dc machines
 

Construction of dc machines

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    Construction of dc machines Construction of dc machines Presentation Transcript

    • Construction of DC machines By, Rohini Haridas Assistant Professor, Dept of Electrical Engineering, SSGM College of Engineering,Shegaon
    • Is DC generator and motor have same construction???
    • Main construction diagram
    • Main parts The two major parts required for construction : 1. Stator That houses the field winding 1. Rotor Rotating part that rotates in magnetic field
    • Other parts Yoke Poles Field winding Armature winding Commutator Brushes
    • Yoke Its main function is to form a protective covering over the inner sophisticated parts of the motor and carries the flux produced by the poles. Made up of cast iron or steel.
    • Poles The magnetic poles are structures fitted onto the inner wall of the yoke with screws. The construction of magnetic poles basically comprises of two parts namely, the pole core and the pole shoe stacked together under hydraulic pressure and then attached to the yoke.
    • Field winding Made with field coils (copper wire) wound over the slots of the pole shoes The field windings basically form an electromagnet, that produces field flux
    • Armature The armature core are provided with slots to which the armature windings made with several turns of copper wire distributed uniformly over the entire periphery of the core.
    • Commutator It is a cylindrical structure made up of copper segments stacked together, but insulated from each other by mica. Collects the current from the armature conductors Converts alternating current induced in the armature circuit into unidirectional current.
    • Brushes Made with carbon or graphite structures, making sliding contact over the rotating commutator. Collects the current from commutator and make it available to the stationary ckt.