Reamer driving device

The utility model discloses a reamer driving device which comprises a reamer motor, a frequency converter, a reamer main transformer, a pre-magnetizing transformer and a time delay switching control circuit, wherein the reamer motor is used for driving a reamer to rotate; the frequency converter is used for controlling rotation speed of the reamer motor, and the frequency converter is electrically connected with the reamer motor; a primary side of the reamer main transformer is connected with a main power supply through a first controlled switch, and a secondary side is connected with the frequency converter; the reamer main transformer is a phase-shifting three-winding transformer, a primary side thereof is connected into a triangle, a secondary side comprises two windings, one winding is connected into a triangle, and the other is connected into a star; an input end of the pre-magnetizing transformer is connected with the main power supply through a second controlled switch, and an output end is connected with the primary side of the reamer main transformer; and the time delay switching control circuit is used for controlling switching states of the first controlled switch and the second controlled switch. The reamer driving device can make the harmonic pollution of the whole system to the power grid small, reduces the magnetizing rush current, and prevents the normal operation of other weak current equipment from being affected due to occurrence of large transient voltage drop.