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DC machine construction
- 1. Dr. J. BelwinEdward, Asso. Prof., SELECT, VIT, Vellore
- 2. • DC Machine(Generator / Motor) • Working Principle • Generator • Motor • Construction (Common) • Types of Armature (Rotor) Winding • Lap Wound • Wave Wound 2 Content Dr. J. Belwin Edward, Associate Professor, SELECT, Vellore Institute of Technology, Vellore, Tamil Nadu, India
- 3. • Stator Assembly •Yoke •Field Poles • Field Windings / Coils • Rotor Assembly • Armature Core • Armature Winding / Coil • Commutator • Brushes • Ball Bearings 3 Parts of a DC Machine Dr. J. Belwin Edward, Associate Professor, SELECT, Vellore Institute of Technology, Vellore, Tamil Nadu, India • Outer frame of the DC generator • It acts as a protecting shield • Provides a complete path for the magnetic field • Provides mechanical support for the poles • Cast Iron – Small, Cast/Rolled Steel - Large
- 4. 4 Construction of DCMachine Dr. J. Belwin Edward, Associate Professor, SELECT, Vellore Institute of Technology, Vellore, Tamil Nadu, India • Stator Assembly • Yoke •Field Pole-Core • Field Windings / Coils • Rotor Assembly • Armature Core • Armature Winding / Coil • Commutator • Brushes • Ball Bearings • It consists of Pole Core & Pole Shoe • Pole Shoe Spreads out the flux in the Air Gap • Large Cross-section – Reduces Reluctance of the Magnetic Path • It acts as a support for the field coils
- 5. 5 Construction of DCMachine Dr. J. Belwin Edward, Associate Professor, SELECT, Vellore Institute of Technology, Vellore, Tamil Nadu, India • Stator Assembly • Yoke • Field Poles •Field Windings / Coils • Rotor Assembly • Armature Core • Armature Winding / Coil • Commutator • Brushes • Ball Bearings • Copper Wire wounded on the former • Current passing through the field coils produces the necessary magnetic flux
- 6. 6 Construction of DCMachine Dr. J. Belwin Edward, Associate Professor, SELECT, Vellore Institute of Technology, Vellore, Tamil Nadu, India • Stator Assembly • Yoke • Field Poles • Field Windings / Coils • Rotor Assembly •Armature Core • Armature Winding / Coil • Commutator • Brushes • Ball Bearings • It houses the Armature conductors • Provides a Low-reluctance path to the flux • Cylindrical / Drum-shaped • Circular Sheet-Steel Disc - Laminated
- 7. 7 Construction of DCMachine Dr. J. Belwin Edward, Associate Professor, SELECT, Vellore Institute of Technology, Vellore, Tamil Nadu, India • Stator Assembly • Yoke • Field Poles • Field Windings / Coils • Rotor Assembly • Armature Core •Armature Winding / Coil • Commutator • Brushes • Ball Bearings
- 8. 8 Construction of DCMachine Dr. J. Belwin Edward, Associate Professor, SELECT, Vellore Institute of Technology, Vellore, Tamil Nadu, India • Stator Assembly • Yoke • Field Poles • Field Windings / Coils • Rotor Assembly • Armature Core • Armature Winding / Coil •Commutator (Split-Ring) • Brushes • Ball Bearings • Facilitates the collection of Current from the Armature conductors • Converts AC-DC (Generator) or DC-AC (Motor) • Cylindrical Structure – Made up of Wedge Shaped Segments of High Conductivity • Each adjacent segments are insulated by thin sheet of Mica • No. of Commutator Segments = No. of Armature Coils
- 9. 9 Construction of DCMachine Dr. J. Belwin Edward, Associate Professor, SELECT, Vellore Institute of Technology, Vellore, Tamil Nadu, India • Stator Assembly • Yoke • Field Poles • Field Windings / Coils • Rotor Assembly • Armature Core • Armature Winding / Coil •Commutator • Brushes • Ball Bearings Different Types of Commutator
- 10. 10 Construction of DCMachine Dr. J. Belwin Edward, Associate Professor, SELECT, Vellore Institute of Technology, Vellore, Tamil Nadu, India • Stator Assembly • Yoke • Field Poles • Field Windings / Coils • Rotor Assembly • Armature Core • Armature Winding / Coil • Commutator •Brushes • Ball Bearings commutator • Collect Current from (Generator) /feed current to (Motor) via commutator • Made of Carbon/Graphite & in the shape of Rectangular blocks • Housed in the Brush holder. • No. of Brushes depends on the magnitude of rotor/Armature current
- 11. 11 Construction of DCMachine Dr. J. Belwin Edward, Associate Professor, SELECT, Vellore Institute of Technology, Vellore, Tamil Nadu, India • Stator Assembly • Yoke • Field Poles • Field Windings / Coils • Rotor Assembly • Armature Core • Armature Winding / Coil • Commutator • Brushes •Ball Bearings• Used to reduce Mechanical Wear & Tear Losses • Ball & Rollers are generally packed in Hard oil. • Sleeve bearings are used to reduce bearing wear
- 12. 12 Construction of DCMachine Dr. J. Belwin Edward, Associate Professor, SELECT, Vellore Institute of Technology, Vellore, Tamil Nadu, India • Stator Assembly • Yoke • Field Poles • Field Windings / Coils • Rotor Assembly • Armature Core • Armature Winding / Coil • Commutator • Brushes • Ball Bearings
- 13. 13 Parts of aDC Machine Dr. J. Belwin Edward, Associate Professor, SELECT, Vellore Institute of Technology, Vellore, Tamil Nadu, India
- 14. 14 Types of ArmatureWinding Dr. J. Belwin Edward, Associate Professor, SELECT, Vellore Institute of Technology, Vellore, Tamil Nadu, India • Lap Wound A=P High Current, Low Voltage machines (Welding) • Wave Wound A=2 Low Current, High Voltage Where A is the No. of Parallel Paths P – No of Poles
- 15. • P. S.Bimbhra, "Electrical machinery", Seventh Edition, Khanna Publications, 2014. • B. L. Theraja, A. K. Theraja, “Electrical Technology, Vol-2”, S. Chand Publisher. Construction of a DC Generator - Basic Electrical & Electronics Engineering • https://www.youtube.com/watch?v=d_LOXUEFA-o How does an Electric Motor work? (DC Motor) • https://www.youtube.com/watch?v=CWulQ1ZSE3c Construction and Working of a DC Motor (3D Animation) • https://www.youtube.com/watch?v=E9X_ZQDt670 How Motors Work For Beginners (Episode 1): The DC Motor • https://www.youtube.com/watch?v=onjFFoOC_yk 15 Dr. J. Belwin Edward, Asso. Prof., SELECT, VIT, Vellore Reference
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