Liquid Rotor Starter
Liquid Rotor Starter

Liquid Rotor Starter

This thyristor-based liquid rotor starter enables stepless voltage ramping and controlled current limitation. Prevents mechanical shock during motor acceleration without frequency conversion, offering cost-efficient LV/MV protection.

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Description

Technical Parameters

Brief Introduction

Engineered to eliminate mechanical shock during startup, this soft starter liquid rotor starter progressively regulates voltage through phase-controlled thyristor ramping, delivering smooth torque buildup without frequency conversion.

Core Starting Technologies:

Controlled Current Ramp: Limits inrush currents to 6-7 times below direct-start overload levels, preventing shaft torsion failures and mechanical stress.

Thyristor Voltage Modulation: Gradual conduction angle adjustment enables stepless voltage elevation from zero to rated supply, eliminating torque spikes.

Cost-Efficient Simplicity: Pure voltage regulation (non-frequency conversion) ensures lower complexity and maintenance costs versus VFD alternatives.

High/Low Voltage Adaptability: Standardized thyristor stacks support both MV/LV applications with unified control logic.

Critical implementations include:
• Pre-programmed torque curves for centrifugal pumps, conveyors, and compressors
• Bypass contactors engaging after run-up completion to minimize heat dissipation
• Insulated gate drivers with snubber circuits suppressing voltage transients
• Thermal-derating protection during extended starts

The CMC-LX 160-3 unit executes:

Adjustable current limiting via rotary dial interface

Real-time monitoring terminals for voltage/current validation

DIN-rail compatible control modules reducing cabinet footprint

NEMA 12 enclosure guarding against dust ingress

Validated for 380-690V systems, it extends motor lifespan through shock-free acceleration while eliminating gearbox/bearing damage common in uncontrolled starts. Excludes frequency manipulation capabilities for dedicated voltage-regulation applications.

Mounting

liquid rotor starter

Production Details

Frame

Compact and robust iron casting frame
Universal IEC and NEMA installation dimensions
Customizable

liquid rotor starter

Stator

99.9% pure copper winding for stator to ensure the output power and efficiency
Excellent insulation system with 5 more processing flows
All the windings are fitted in by handwork to ensure all slots are full and avoid any winding flaw.

Rotor

Aluminum casting rotor with silicon steel rotor core to assure induction efficiency
Precisely machined shafts with good capacity of strength and toughness

Testing

All motors must pass the piece testing before painting and packaging
Type tests will be regularly performed for each series, more often for new developed series and variants.