Electrical Articles Archive
What is Rectification
Rectification is the process of converting the alternating voltage or current into the corresponding direct (dc) quantity. (Direct voltage or current) The input to a rectifier is ac whereas its output is unidirectional or dc. The electronic
TRACTION MOTOR
General requirements of Traction motors / traction system High starting torque A traction motor must have high starting torque. For urban and sub urban lines, the acceleration (speed at starting) should be high. Simple speed control –
Single Phase AC System vs Three Phase AC System (with Picture)
Motor used – A.C. series motor Voltage – 15 KV to 25 KV This is the voltage of overhead wire and not of motor. Motor operates at 400 V or 300 V. So, the 25 KV voltages
Direct Current (DC) System
Motor used in Direct Current System – Dc Series Motor Dc Compound Motor (as regenerative braking is difficult for Dc series motor) Dc series motor has high starting torque and easy speed control. Size of Dc series
Construction of DC Machine
The main parts of DC Machine (motor or generator) are as follows: Yoke Pole core and pole shoes Pole coil and field coil Armature core Armature winding or conductor Commutator Brushes and bearings 1. Yoke Function It
Types of Dc Machines
Following are three types of dc machines: 1) DC generator: “Energy can be converted from one form to other form” It is rotated by prime mover and produces a dc voltage. i.e. Convert mechanical energy into electrical