When the electric wrench rotates, it is very laborious. How can you repair the smoke when it is turned?
Electric wrench and electric drill, angle grinder and other power tools are different, there are positive and reverse, two-way operation, motor is a series of motor, serial motor, a characteristic is difficult to take into account two-way operation, relatively easy to optimize one-way.
There is no spark, there is a reversal of sparks, there may be two reasons, one is the motor winding design problems, not take into account the reversal; two is the individual cause of the motor, a fault.
