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An electric motor is a device used to convert electricity into mechanical energy.
Electric motors work by converting electrical energy to mechanical energy in order to create motion. Force is generated within the motor through the interaction between a magnetic field and winding alternating (AC) or direct (DC) current.
There are several characteristics that you need pay attention to when selecting a used electric motor:
Current is what powers the motor and too much current will damage the motor. For DC motors, operating and stall current are important.
Voltage is used to keep net current flowing in one direction and to overcome back current. The higher the voltage, the higher the torque.
Operating torque is the amount of torque the motor was designed to give and stall torque is the amount of torque produced when power is applied from stall speed.
Velocity, or speed (RPM), can be complex regarding motors. The general rule is that motors run most efficiently at the highest speeds but it is not always possible if gearing is required. Adding gears will reduce the efficiency of the motor, so take into account speed and torque reduction as well.
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