Liquid Resistance Starter

These are used for inserting external resistance in the rotor - circuit of slip ring induction motor at the starting to reduce starting - current and increase starting - torque. used in various industries and installations like : cement plants, rolling mills , pumping plants, sugar mills, paper plants. we manufacture & supply liquid rotor resistances with both motor operated or manually operated mechanism. these give step - less cutting of resistance and are economical in comparison to wire wound or grid -resistances. we also manufacture stator - rotor panels.

Moving and fixed Electrodes are fabricated sheet steel ( Zinc Plated ) of suitable profile and size. One set of fixed Electrodes are mounted on Epoxy Cast Insulators and connected to Main Teminals, other set of moving electrodes are shorted and earthed. Electrodes of stainless steel can also be supplied if required.

A Control Box is provided for electrical operation, housing all Relays, Contactors, Push Buttons, Indicating Lamps, Switches and other necessary electrical items. Forward and reverse contactors with over load relays are provided to actuate the pilot motor. Contactors are interlocking such that only one contactor can be operated necessary interlocking circuits are provided for the safety of main motor.

Driving Mechanism is provided in the mechanism box containing pilot motor, gear box, set of spur gear and pinion, transmitting power to moving channel through a shaft fitted with sprocket and chain arrangement. The moving electrodes are fixed to the channel fitted with rollers moving smoothly on horizontal guide rails. During emergency or for maintenance, the mechnism can also be operated manually by a hand wheel after disengaging the motor drive with the help of declutching arrangement provided. To arrest the movement of the moving system at the end position, oil tight limit switches are provided.

Cable Box is of sufficiently large size cable gland plate is provided for termination of rotor cable to connect liquid resistance to the rotor of motor for proper termination of cable is on bus bar. The cable box also accommodates shorting contactor.

Smooth Start of Motor, liquid resistance provides high starting resistance to rotor circuit, cutting the resistance sleeplessly, synchronizing with motor acceleration to very low or negligible value near full load speed. This gives a high starting Torque and very smooth start. The above figure shows the comparision of grid resistance start and liquid resistance start. Liquid Speed Controllers can be supplied to provided required slip resistance to the slip-ring motors for speed variation special sized electrolyte tank and heat exchangers are provided to dissipate the heat energy generated in electrolyte during variation of speed special pump ( with mechanical seal ) is provided to circulate the electrolyte continuously.


Liquid Resistance Starter


These are used for inserting external resistance in the rotor -circuit of slip ring induction motor at the starting to reduce starting - current and increase starting - torque used in various industries and installations like : cement plants, rolling mills, pumping plants, sugar mills, paper plants.

we manufacture & supply liquid rotor resistances with both motor operated or manually operated mechanism. these give step - less cutting of resistance and are economical in comparison to wire wound or grid -resistances. we also manufacture stator - rotor panels.