4. A 12 watts DC motor is used to run a remote-controlled car. A 3-inch aluminum shaft, with a diameter of 1/8 in., is connected to the motor rotates 5000 RPM. Determine the maximum shear stress on the shaft and the angle of twist if the shaft will be supported at the free end. Use G = 28 GPa %3D

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Speed control of motor

Speed control by DC motor-speed controller is required to realize variable speed drive. Whenever a motor drives a particular load, it is called drive, and variable speed drive refers to a load requiring variable speed. All this is obtained by a DC motor speed controller.