The process of introducing impurities in to the selected regions of silicon wafer is called diffusion. The rate at which various impurities diffuse into the Silicon will be of the order of 1 micro metre per hour at the temperature range of 900 degree Celsius 1100 degree Celsius. The utility and terms of the tendency to move from regions of Ion concentration to lower concentration.
Thursday, 17 November 2016
Thursday, 20 October 2016
Advantages and disadvantages of synchronous motors
Advantages and disadvantages of synchronous motors
Advantages of synchronous motors
1. The speed is constant and independent of load.
2. These motors usually operate at higher efficiency
3 .Electromagnetic power varies linearly with the voltage.
4. These motors can be constructed with wider air gaps than induction motors, which make them better mechanically.
5. An over excited synchronous motor having a leading power factor can be operated in parallel with induction motors.
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