Abstract
In the present paper it is explained that although there are many methods, in practice, for the power factor compensation of the polyphase induction motor; it is seemed most economical for small size of induction machine from the design considerations of electric machine that the compensating means make a part of electric or magnetic circuit of the motor. Then the writer is saying that the compensated induction motor will be the very best one as the induction motor of high power factor from such a view point. A typical type of the compensated induction machine is quated and explained its theory standing on its vector diagram.
A method of calculation of the performance characteristics of such a type of the machine is shown and arranged in order to be convenient for the calculation in routine work in practice. The performance characteristics under various brush angle is calculated by the author's method and researched the effect of the brush position on its performance characteristics summarizing these results of calculation. Then the meaning of the best brush position is explained clearly.
The calculations were done using the necessary constants which were obtained from the test machine and then their results are compared with that obtained from actual load test of the machine. These comparisons show that this method of calculation is worthy to determine the performance characteristics of such a machine relying on, not load test, but loss tests only.
The primary current wave is very spoiled containing several higher harmonics generally in such a type of machine and, for example, the oscillograms taken by the test machiue are shown for our information. At last the compensated induction machine as the generator is considered briefly.
