4-Pole Motor
4-Pole Motor 4-Pole Motor
4-Pole Motor

A DC Brush Motor is one of the earliest of all electrical motor designs. It is usually the motor of choice for the majority of torque control and variable speed applications. The Brush DC Motor provides simple speed control without the need of complicated electronics. The voltage applied to a Brush DC Motor is proportional to rotational speed, while torque is proportional to the current. By applying variable supply voltage, speed control can be achieved. The Brush DC Motor typically rotates toward the pole alignment point. The number of poles is the factor that determines the synchronous speed of a synchronous machine, and the running speed of an induction motor. A 4-pole motor is with 4 magnetic poles on the rotor and the number of related electro-magnetic windings (circuits.)

A 4-pole motor has about 3.0 ft.-lbs of torque per horsepower where a 2-pole motor has 1.5 ft.-lbs of torque. At 60 Hz, a 4-pole motor is about 1800 rpm where a 2-pole motor is 3600 rpm. Thus, the 4-pole motor provides higher efficiency, higher torque per unit of volume and weight.


When applied the same voltage and frequency is in the speed (RPM) and is given by the formula:

        S = f120/n

        where: S = rotor speed in rpm
                     f = frequency
                    n = number of poles per phase
                    120 is a constant



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