A simple, robust, and economical starting resistor

Delivered in IP23 case.
Starting resistors are calculated for each application and then manufactured in our workshops from stainless steel.
The result: starting resistors that provide identical starts, faithfully accompanying even the harshest processes | vibrations, humidity, corrosive atmosphere, heat, cold, dust, etc.
The boxes are sized for a number of starts and a timing period and are protected in case of overruns.

Benefits

• Initial power supply to the motor at reduced voltage
• Wide range of possibilities depending on priority (maximum torque, maximum current, etc.)
• Smooth ramp-up
• Economical
• Adaptable depending on the type of torque
• maintenance-free

Principle

Slip ring motors are excellent motors offering high power and a good compromise between a very economical but difficult to control cage motor and expensive servo motors. They offer precise adjustment options and good current/torque linearity around the nominal current.
A rotor start-up is carried out in several stages, generally between 3 and 5 stages. This is because slip ring motors start up under very unfavorable conditions: very low initial torque, starting current 7 times higher than the nominal current.
An economical solution, offering many possibilities and adaptable to different processes, consists of inserting resistors into the rotor circuit. The resistors are operated during start-up to enable the motor to start optimally. Each operation corresponds to a stage. Depending on the currents involved and the number of stages, it is possible either to add resistors in parallel or to short-circuit resistors in series, the aim always being to reduce resistance during start-up.

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