The electric wrench is turning, no sparks, no sparks
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.
