When starting, an electrical motor has a huge current
demand.
Inserting a resistor in the circuit (on stator side for
squirrel cage motors and on rotor side for ring type
motors ) will help to reduce current appeal, to control
torque level and to pilot starting phase duration.
When braking or stopping, a motor needs to purge its
kinetic energy. Most simple way is to dissipate this
energy into a resistor.
Parameters which will be used
for those resistors are :
- Stator or rotor electrical data
- Motor power
- Number of starting or braking steps
- Rated starting torque
- Starting or braking duration
- Starting or braking motor load or inertia
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