Communication channel

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Communication Channels: Telephone Channels, Co-axial cable, Optical Fiber, Wireless Broadcast channels, Mobile radio channel, Sat-elite channel. Prepared By: Rashmi Saini B.Tech (ECE) 4th Semester (2012-13), Guru Nanak Education Trust Group of Institution, Roorkee.

In recent years, Permanent Magnet Synchronous Machines (PMSMs) are increasing applied in several areas such as generation, traction, automobiles, robotics and aerospace technology. Basically PMSG topology has been beneficial for slow speed and variable speed operation and steady state output power produced in operation. PMSG is a part of synchronous machine family, so its construction features almost equivalent to synchronous machine. With respect of designing a PMSG, the permanent magnetic pole lies on the rotor and armature winding are in the inner part of stator that is electrically connected to the load. Armature winding consists of the set of three conductors which has phase difference 1200 apart to each other and providing a uniform force or torque on the generator’s rotor. To operate PMGS, it is connected to wind turbine through a shaft without gear box and rotate at slow speed. This uniform torque produced by the resultant magnetic flux which induces current in the armature winding. The stator magnetic field combined spatially with rotor magnetic flux and rotates as the same speed of the rotor. So the two magnetic fields synchronously rotate in PGSM to maintain the relative motion of rotor and stator. Thus the permanent magnets rotates at constant speed without any DC excitation system, which means it has not required any slip rings and contact brushes to make it more reliability or efficient.

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