MEASUREMENT OF MAGNETIC FIELD INDUCTION COMPONENTS IN THE GAP OF AN INDUCTION PUMP,
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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It is noted that the magnetic field in the inductor of an induction pump consists of a travelling and a pulsating component. An expression derived elsewhere by G. I. Shturman is given for the distribution of the induction B in the clearance of an induction motor with closed magnetic drive. The author points out that in a test coil, placed in the clearance of an induction pump, a voltage is induced from the travelling as well as from both pulsating components of the induction. This phenomenon is examined in detail in the article on the basis of the Faraday law. It is shown that the induction of a travelling magnetic field can be measured by separating the two components of the pulsating field by means of three coils, with one of the coils placed in the center of the inductor and the other two placed symmetrically with respect to the first in the position y sub 0 2k 1 tau2. The symmetrical coils are connected in series with one another and in opposition to the center coil. The coil parameters necessary for compensation of the pulsating component are indicated, and the limitations of this method of measuring the inductance of a travelling magnetic field are noted. For the measurement of the distribution of the travelling component of the inductance, two pairs of coils are required, each pair being placed symmetrically with respect to the center of the inductor and interconnected in a congruent manner. One coil pair is used to measure the travelling component and the second pair to compensate for the pulsating component of the induction, distributed according to the hyperbolic cosine law.
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