| 摘要 |
PURPOSE:To variably control the range of a speed corresponding to between windings by switching the rate of a current flowing time to a plurality of windings which varies in a plurality of stages at the speed. CONSTITUTION:A single-phase induction motor M has 2 windings for 'strong' and 'weak', and the windings are connected through triacs (TR1) and TR2 with a power source. The operating times and the switching times of the TR1 and TR2 are controlled by controlling the inverting time of a set-reset flip-flop (R-SFF) by utilizing the combination of set values of DIP switches (SW1) and SW2 and zero-cross detection pulse from an NOR gate. Thus, the rate of the current supplying times to the two windings for 'strong' and 'weak' is controlled to arbitrary control a rotating speed. |
