| 摘要 |
<p>PURPOSE:To reduce the size and the weight of a load motor by providing an intermediate terminal for dividing the output voltage from the ternary winding of transformer unequally and making the voltage variation rate at the side having large number of turn higher than that at the side having small number of turn. CONSTITUTION:One intermediate terminal Z is provided in the ternary winding 14 of a transformer 10 such that the number of turn at U terminal side will be smaller than that at V terminal side, and the intermediate terminal Z is connected directly and permanently with the terminal of the auxiliary winding 16 of a phase converter 16. Voltage variation rate of the ternary winding is set such that epsilonu<epsilonv where epsilonu is the voltage variation rate of U-Z phase of the ternary winding and epsilonv is the voltage variation rate of V-Z phase of the ternary winding. The relation can be set, for example, by constituting the ternary winding with two independent windings and selecting the mutual spacial position or the spacial position with respect to the primary winding. Since the voltages of V-W phase and W-U phase are equalized through internal impedance drop of the ternary winding and the phase converter os the load current increases, output voltage of the phase converter 16 does not increase excessively.</p> |
