| 摘要 |
PROBLEM TO BE SOLVED: To control a brushless D.C. current motor-driven machine in accordance with a load state by controlling the number of closed loop rotation by means of the rotation number command of a motor-driven blower, which is calculated based on sucking vacuum pressure, and the pressure change of sucking vacuum pressure and also correcting a rotation command by means of the load current correcting value of the motor-driven blower. SOLUTION: The position of a rotary element 23 of the brushless D.C. current motor-driven machine 21 is detected by a position detecting part 24 so as to detect the number of rotation and pressure P in the dust collecting port part of a dust collecting bag is detected by a pressure sensor 13. When suction vacuum pressure P is reduced together with a dust collecting quantity, a microcomputer 9 executes control to highten sucking vacuum pressure by increasing the number of rotation. Moreover, when the current of the motor-driven blower 21 reaches a setting value, shifting is executed from rotation number correction by sucking vacuum pressure P into that by current I, control to lower the number of rotation is executed as against current and control is also executed in a character area with current fixing control. |
