Item specifice

Function of braking resistance: 1 Protect the frequency converter; 2. Protect
the power network. Braking resistance is a kind of ripple resistance, which is
mainly used in the mechanical system of frequency converter controlling the
rapid shutdown of motor. The firecracker motor converts the regenerative
electric energy generated by the rapid shutdown into heat energy. The principle
of resistance braking is that the rotor has current flow, which generates
torque opposite to the rotation direction in the magnetic field of the stator,
consumes the kinetic energy of the train, and achieves the purpose of braking.
When the motor or other inductive load driven by the frequency converter stops,
it is generally realized by energy consumption braking, that is, the kinetic
energy of the motor and the magnetic energy in the coil are consumed through
another energy consuming element after stopping, so as to realize rapid
shutdown.
Compent:
Ceramic tube: it is the skeleton of alloy resistance wire and has the effect of
radiator at the same time


Alloy resistance wire: the flat belt has a wavy shape and is wound on the
surface of the ceramic tube, which is responsible for converting the
regenerated electric energy of the motor into heat energy

The coating is flame-retardant on the surface of the alloy and has the
characteristics of high temperature resistance
Main hazards
During the rapid shutdown of the motor, a large amount of regenerative electric
energy will be generated due to inertia. If this part of regenerative electric
energy is not consumed in time, it will directly act on the DC circuit part of
the frequency converter. If it is light, the frequency converter will report
fault, and if it is serious, the frequency converter will be damaged; The
emergence of braking resistance solves this problem and protects the frequency
converter from the harm of motor regenerative electric energy;


Smooth operation
The braking resistance directly converts the regenerative electric energy in
the process of rapid braking of the motor into heat energy, so that the
regenerative electric energy will not be fed back to the power network and will
not cause grid voltage fluctuation, which plays a role in ensuring the smooth
operation of the power network