PROBLEM TO BE SOLVED: To provide a power-type scale removing machine that can suppress power loss and heat generation, ensures sufficient torque and can be manufactured at low cost.;SOLUTION: A controller unit 2 of a power-type scale removing machine 1 includes: a switching power supply 21 with an output voltage being variable; and a voltage control unit 22 in which a first voltage being the lower limit of the output voltage is set in a variable range of a switching power supply 21, a specific voltage is output from the switching power supply 21 to the DC brushless motor 31 when the specific voltage for obtaining a rotational speed being set by a speed setting knob 23 with a DC brushless motor 31 is larger than the first voltage, and the first voltage is output by a PWM control method so that the rotational speed being set by the speed setting knob 23 may be obtained from the switching power supply 21 to the brushless motor 31 when the specific voltage is lower than the first voltage.;SELECTED DRAWING: Figure 5;COPYRIGHT: (C)2018,JPO&INPIT
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