# Dc Drives-Principles of DC Drive Control

May 4th, 2015
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To learn the basic characteristics of DC motors and their control parameters * to understand the various operating modes DC motors and their representation: The basic principle of a DC motor is the production of a torque as a result of the flux interaction between a “field” produced on the STATOR (either produced by a permanent magnet, or a field winding) and the current circulating in the “armature” windings on the ROTOR.

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Dc DrivesPart I: Principles of DC Drive ControlLearning Objectives: * to learn the basic characteristics of DC motors and their control parameters * to understand the various operating modes DC motors and their representation: The basic principle of a DC motor is the production of a torque as a result of the flux interaction between a field produced on the STATOR (either produced by a permanent magnet, or a field winding) and the current circulating in the armature windings on the ROTOR. In order to produce a torque of constant sign, the armature winding loops are connected to a set of brushes which commutate the current appropriately in each loop according to their geometric position. The commutator is a MECHANICAL RECTIFIER. Note that reversal of either the field current or the Armatur e Current armature current results in a torque in the opposite Field (free direction. However, reversal of both fields does Control wheeling Rfc Resistor diode) not change the torque direction, hence it can be +V used as a universal motor with DC or AC feed (La, Ra) (Rf, Lf) Eo if both windings are in series. NBasic Equations of a DC Machine:Fig 1: DC MotorSteady state conditions (assume all time varying quantities have a constant average value) Vf = Rf I f E = K vI f ( field winding ) (Counter emf or Back EMF ) (armature voltage ) (electrical torque)Va = Ra I a + E = Ra I a + K vI f Te = K t I f I a = A + B + Tload Pd = Te(developed power )(The

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