| 摘要 |
PURPOSE:To simplify an electric cleaning machine by connecting diodes connected in antiparallel to a handle switch and connecting it to the motor of a motor driven floor suction drive, thereby using mere two conductors between the machine body and the handle switch. CONSTITUTION:The operation of the handle switch 11 is detected by a current direction detector 12, stored in a memory 4 through an integrator 13, the output is compared with the output of a sawtooth wave generator 15, a pulse is generated at the coincidence time point, thereby controlling a bidirectional thyristor 19 to control the speed of a fan motor 9. The switches 11, 12 are formed of diodes 24, 25 and handle switches S1, S2 connected in antiparallel, connected to the motor 10 of a motor drive floor suction drive, the motor 10 is driven by the selection of the switches S1, S2, and a signal from the integrator 13 is outputted. Accordingly, only two conductors may be sufficient even when using the motor drive suction, thereby simplifying the structure. |
