Starting Resistors
For smooth starting of wound rotor and DC motors
What is a starting resistor?
In slip-ring rotor motors, which are often used in high-power applications, the starting current must be controlled during the startup phase to achieve a “soft start.” This is accomplished using starting and regulating resistors, whose stepped resistance values are gradually short-circuited as the motor speed increases. For this purpose, FRIZLEN steel grid resistors or lamina type resistors are commonly used, where resistors in stages are integrated in one or more units.
Three-phase starting resistors for slip-ring motors
The FRIZLEN FS3 series provides an efficient solution for the gentle starting of slip-ring motors in the medium and high power range. These devices are designed as three-phase resistors and specifically limit the starting current through a resistor gradation in the rotor circuit. This generates a high starting torque while simultaneously protecting mechanical and electrical components.
The FRIZLEN team will be happy to assist you in selecting the right starting resistor for your application.
Starting resistors for DC motors
In industrial settings where a permanent and fail-safe power supply must be ensured – such as for powering safety-critical components – battery-powered DC motors are often used. A typical application is the lubrication supply for turbines or generators in power plants.
When starting such motors, it is essential to limit the starting current in order to prevent overloading of both the battery and the motor winding. For this purpose, single-phase starting resistors are used, which are individually designed for the specific application and power consumption of the motor.
The FRIZLEN FKE 31 series is frequently used for this purpose. It features a very compact design and, with its open construction, is installed directly into the switch cabinet.
