JPS5456109A - Pole change induction motor - Google Patents

Abstract

PURPOSE: To enable a pole ratio of 1:4 obtained with a series-parallel connection switched for both of coil groups, by making a constitution of each phase coil from a first and second coil groups to make an arrangement in core grooves, that number 12n, in a specific order.

CONSTITUTION: A constitution of each phase coil of U, V, W phase is made by a first coil group (U_1a, U_1b), (V_1a, V_1b), (W_1a, W_1b) and a second coil group (U_2a, U_2b), (V_2a, V_2b), (W_2a, W_2b), with an arrangement made in core grooves, numbering 12n, for instance, numbering 12, 1 to 12. The arrangement will be made as shown in the drawing, as a coil, connected from power source terminals U, V, W toward a direction of neutral point, for positive and a coil, connected toward an opposite direction to the neutral point, for negative. That is, two phase coils of the three phase coils in the first coil group, for instance, V_1a, W_1b and two phase coils of the three phase coils in the second coil group, for instance, U_2a, V_2b are alternately arranged so as to be a phase sequence of U, V, W or U, W, V. In such manner as in the above, with a connection switched to parallel or series between the first and second coil groups, the pole change of 2 and 8 poles will be operated into a ratio of 1:4

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