ELECTRIC POWER TOOL

An electric power tool comprising a brushless motor including a stator and a rotor, the stator having a plurality of windings, the rotor being rotatable relative to the stator, an induced voltage being generated from the plurality of windings upon rotations of the rotor; a rectifier circuit configured to rectify an AC voltage; a smoothing capacitor configured to produce from the rectified voltage a pulsating voltage in which ripples remain; an inverter circuit configured to sequentially switch the plurality of windings for energization by a capacitor voltage developed across the smoothing capacitor; a receiving unit configured to receive a drive instruction for driving the brushless motor by a user; and a control unit configured to control the inverter circuit, wherein the smoothing capacitor has such a capacity that a first period of time for which a current flows through the brushless motor and a second period of time for which the current does not flow through the brushless motor alternately take place, the current flowing through the brushless motor for the first period of time being caused by the capacitor voltage exceeding the induced voltage resulting from a variation in the capacitor voltage accompanying a variation in the rectified voltage, the current not flowing through the brushless motor for the second period of time being caused by a balance of the capacitor voltage with the induced voltage, that the control unit is configured to control the inverter circuit such that the inverter circuit performs the sequential switching during both the first period of time and the second period of time insofar as the drive instruction is being received at the receiving unit.