Figure 49 Dc Drive Dynamic Brake Circuit - the dynamic brake circuit includes the switching device an insulated gate bipolar transistor or igbt the control circuit and the resistor a chopper on the other hand only includes the regulatory circuit and switching device with the resistors being separate ponents perkins power products what is dynamic braking or rheostatic of dc motor circuit figure 1 23 connections for dynamic braking of a shunt wound dc motor rheostatic dynamic braking is the use of an electric traction motor as a generator when slowing a vehicle such as an electric or diesel electric lo otive it is termed rheostatic if the generated electrical power is dissipated as heat in brake grid resistors and regenerative if the power is returned to the supply line in a variable frequency drive vfd application the motor will feed back braking energy into the dc link when it is in braking operation this may cause a dc link voltage.

rise up to a critical level in this circuit the armature terminals of the dc motor are disconnected from the power supply and immediately connected across a resistor which acts as a load the smaller the resistance of the resistor the greater the rate of energy dissipation and the faster the motor slows down





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