Why do electric drills use brush motors?
Easy to use, can be used in AC single-phase power supply, so the use of power supply is convenient.Change the input voltage, you can change the speed, so speed is also very convenient.
The crisis of high speed, small size, light weight and other AC motors are related with power frequency, when the power frequency is 50, but the speed can not exceed 3000r/min single-phase series excitation motor speed is not affected by power frequency limit.The higher the motor speed is, the smaller the amount of ferromagnetic material used in the motor, so the volume and weight of the motor will be reduced accordingly.
Start J torque and strong overload capacity single-phase series motor starting torque is large, 12000 R / mln motor starting torque of up to 4 to 6 times the rated torque of AC motor, and the other is 1 times the most single-phase so it is applicable to electric overload capacity, also suitable for heavy load.
