. A text-book of electrical engineering;. Fig. 470 Fig. 471 143. La Cours Motor Converter. The disadvantages of the rotary converter with regard both to startingand regulation of the terminal pressure on the side are obvious. Furtherdisadvantages are the necessity of static transformers for reducing thealternating supply pressure, and the difficulty of commutation for any butlow frequencies. These difficulties are overcome to a certain extent by usingmotor-generators, in which the two machines are quite distinct but coupledmechanically together. We then have a free hand in the design of e
. A text-book of electrical engineering;. Fig. 470 Fig. 471 143. La Cours Motor Converter. The disadvantages of the rotary converter with regard both to startingand regulation of the terminal pressure on the side are obvious. Furtherdisadvantages are the necessity of static transformers for reducing thealternating supply pressure, and the difficulty of commutation for any butlow frequencies. These difficulties are overcome to a certain extent by usingmotor-generators, in which the two machines are quite distinct but coupledmechanically together. We then have a free hand in the design of eachmachine, and the number of poles in the dynamo is not affected by thefrequency of the supply. The motor can be designed to take the fullsupply pressure, thus dispensing with transformers, and the terminalpressure can be regulated in the usual way. On the other hand, we have twomachines each of the same output, which is also the full output of the increases the capital cost, requires more floor space, and decreases t
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