4V Hand-Held Electric Frequency High Working Stability Screw Machine Drill Electric Screwdriver

Single phase series motor with commutator and DC motor will cause serious electrical interference to TV and radio, so the interference of tilting system to radio shall be considered in the design of electric screwdriver. Measures such as shielding, symmetrical connection of exciter windings, setting of electrical filters, and connection of filters into △ shape are mainly adopted. If necessary, small inductance coils can also be connected in series at both ends of the motor armature.

The electric screwdriver shall be powered on and operated for one minute. When it is operated, it shall be held by hand. The hand shall not feel any abnormal vibration obviously. Observe the reversing spark. The reversing spark shall not exceed 3/2 level. Generally, when viewed from the air inlet of the electric screwdriver, there shall be no obvious arc light on the surface of the commutator. There shall be no abnormal noise during operation.