SIMPAX - oil and dry-air automatic resistance starters
The automatic resistance starters manufactured by SIMPAX are used to start wound-rotor induction motors applied in older types of high-power electrical machines.
Frame They are connected to three phases of motor rotor winding, using U, V and W terminals. The start up consists in activating individual resistance stages of the resistor. The use of active resistance in the rotor circuit reduces the motor starting current to a value being only about twice as high as the rated current and increases the starting torque – with this such motor can be started under load.
SIMPAX manufactures SIMPAX automatic resistance starters for every application, power (from a few Watts to a MW) and load cycle. N
Based on many years of experience and advanced 3D modeling, we can custom design a non-standard resistance starter, requiring unusual resistance elements and power [see SPECIAL DESIGN RESISTORS].
Design of resistance starters
In terms of electricity, it is a three-phase resistor with tapping connections corresponding to different resistance stages: R1, R2 .... The tapping connections are activated by contactors in accordance with parameters and start-up times – individual for each machine. The whole unit is regulated by a microprocessor controller or a normal – time controller.
Parameters of automatic resistance starters
| Resistor operating current [A] | In accordance with the starting current which results from the motor impeller parameters |
| Start-up time: | In accordance with machine start-up characteristics |
| Type of operation: | Pulse operation (only for start-up), cycle operation [%] for speed regulation resistors |
| Resistance: | Specify total phase resistance and the resistance of individual start-up stages |
| Start-up stages: | From 2 to 6 as standard, in accordance with machine start-up characteristics |
| Insulation voltage: | ≤ 1kV, or ≥ 1kV |
| Type of cooling: |
Natural, forces by fans, or oil cooling |
