Connection method of rotor coil winding for portable electric drill
AC220V power tools are generally series excitation method, that is: the stator and rotor through carbon brush, commutator series connected to the power supply, of course, do not forget to switch the middle.
The voltage on the motor increases gradually, which increases the speed of the electric drill. Speed reduction of electric drill. When testing the incandescent lamp and a switch speed of about 100W series after receiving power (wiring methods are shown on the left). When the speed control switch is pressed, the incandescent lamp is bright. And the brightness changes as the force changes. This speed adjustment switch is normal.
When a hand-held electric drill is operated, a sliding rheostat is pressed by the index finger. When the force increases gradually. The voltage drop on the silicon controlled voltage regulator circuit is small.
