DC Motors DC MOTOR THEORYDC MOTOR THEORYDC motors are widely used to drive various equipment. The speedand torque produced in a DC motor depends on a variety of factors.EO 1.1 Using the right-hand rule for motors, DETERMINE thedirection of the magnetic field, direction of current flow,or force on a conductor.EO 1.2 STATE the function of torque in a direct current motorand how it is developed.EO 1.3 DESCRIBE how Counterelectromotive Force (CEMF) isdeveloped in a DC motor.EO 1.4 DESCRIBE the relationship between field current andmagnetic field size in a DC motor.EO 1.5 STATE the function of the CEMF that is developed ina DC motor.EO 1.6 DESCRIBE how the speed of a DC motor is adjusted.EO 1.7 DESCRIBE the relationship between armature currentand torque produced in a DC motor.InducingaForceonaConductorThere are two conditions which are necessary to produce a force on a conductor.The conductor must be carrying current.The conductor must be within a magnetic field.When these two conditions exist, a force will be applied to the conductor, which will attempt tomove the conductor in a direction perpendicular to the magnetic field. This is the basic theoryby which all DC motors operate.Rev. 0 Page 1 ES-06
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