| 摘要 |
PURPOSE:To improve a usability by operating a motor fan and a motor for driving a rotary brush built in a floor nozzle by means of both an alternating current and a secondary battery, respectively. CONSTITUTION:When an alternating power source 7 is used, a changeover switch 8 is turned on, and an alternating power is supplied to a motor fan 9. By a phase control circuit 11 and a bidirectional thyristor 10, a set voltage lower than the commercial power source 7 by being phase-controlled is impressed between the terminals of the fan 9. To a motor 19 for driving a rotary brush, the tap output of the fan 9 is supplied through a diode bridge 18. At the time of an operation of the secondary battery, the switch 8 is turned off, the power is supplied from tap terminals 14 and 15 of field coils 12 and 13 to the fan 9, and the power is supplied through the diode bridge 18 also to the motor 19. The voltage specification of the fan 19 is set by the voltage of a secondary battery 17, and it is made approximately equal to the voltage between the tap terminals of the fan 9 and the voltage of the secondary voltage 17 at the time of the operation by the alternating power source 7. |
