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Dynamic Braking Resistor Calculations

Dynamic Braking Resistor is a high power / wattage resistor used by a electric motor to assist in the process known as dynamic braking.

DC motors, unlike AC motors, act like a electrical generator when the motor has been disconnected from the power source. The motor functions like a generator due to the DC motors permanent magnet. The resistance to rotation causes the dynamic braking. The voltage and current produced by the DC motor (generator) is directed into the dynamic braking resistor to dissipate the heat energy.

Installation design considerations:

Dynamic braking resistors should be located and mounted into the target assembly such that maximum thermal dissipation through the resistor device may occur. Thermal dissipation will depend on the resistor selected and the power application duty cycle. Care should be taken to ensure the braking resistor installation is clear of combustible materials.

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