New Phylosophy for pole amplitude modulation in the three phase induction machines. | ||||
| ERJ. Engineering Research Journal | ||||
| Article 6, Volume 22, Issue 3, October 1999, Page 87-102 PDF (327.78 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/erjm.1999.72452 | ||||
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| Authors | ||||
| F.E Abdel-kader1; A.E. Abou Mobarka1; W.S. Abouel-Fadl2 | ||||
| 1Dept. of Elect. Eng., Faculty of Eng. Minufiya University, Shebien El-Kom, Egypt | ||||
| 2Dept. of Elect. Eng., Faculty of Eng. Minufiya University, Shebien El-Kom, Egypt. | ||||
| Abstract | ||||
| The induction motor is considered to be one of the best elecmcal motors However up to now,it is difficult to control its speed by an ideal method, or even by a method close to that of direct current motors. In spite of this disadvantage, this motor is widely used when the load is not in need of control of its speed over a wide range. Some loads need to change the speed by a ratio of two or three times the rated value. In this case, it is possible to use the Pole Amplitude Modulation to control the method of speed . This method does not need high cost and keeps the motor characteristics in a high grade. The previous papers on this subject mentioned that this technique can be carried out by different methods of modulating the connections of motor winding parts. There is a contradiction between theory and practice seemed when verifying these connections experimentally on an actual motor, so that the predicted speeds could not be obtained. So the motor performance has been analyzed mathematically and physically. From these results, the conditions necessary for motor windings, their distribution and the method of connection have been obtained. | ||||
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