Unit DC Motors and Generators

Festo Didactic 30329-00 61 When you have completed this unit, you will be able to use the DC Motor/Generator module to demonstrate and explain the operation of dc Motors and Generators Operating principle of dc Motors As stated in Unit 1, Motors turn because of the interaction between two magnetic fields. This unit will discuss how these magnetic fields are produced in dc Motors , and how magnetic fields induce voltage in dc Generators . The basic principle of a dc motor is the creation of a rotating magnet inside the mobile part of the motor, the rotor. This is accomplished by a device called the commutator which is found on all dc machines. The commutator produces the alternating currents necessary for the creation of the rotating magnet from dc power provided by an external source. Figure 2-1 illustrates a typical dc motor rotor with its main parts.

armature current + º, so that a dc motor can also be considered as a linear current-to-torque converter. Figure 2-11 illustrates the linear relationship between the motor torque 6 and the armature current + º. Constant 6 is the slope of the line relating the two. Figure 2-12 shows the linear current-to-torque converter. Figure 2-11.

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