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Liquid Resistance Starter Cabinet

Liquid Resistance Starter Cabinet

The Liquid Resistance Starter Cabinet is a starting and speed control device for large asynchronous motors. By adjusting motor starting current through liquid resistance, it enables smooth startup and multi-stage speed regulation. The cabinet features a reliable structure and stable performance, effectively reducing motor starting impact and mechanical wear. It is widely used in mining, metallurgy, power systems, and large industrial machinery.

The cabinet is made of high-quality corrosion-resistant materials and is equipped with a liquid resistance regulation system and comprehensive protection devices, ensuring easy operation and reliable safety. The liquid resistance starting technology guarantees smooth motor performance during startup, acceleration, and deceleration, improving equipment efficiency and service life.

  • Liquid resistance starting for smooth start and stop

  • Multi-stage speed control for various load conditions

  • Reduces starting current impact and mechanical wear

  • Easy operation, safe and reliable

  • Extends motor and mechanical equipment lifespan

Applications: Mining coal mills, metallurgical rolling mills, power transmission systems, and large industrial equipment startup and speed control scenarios.

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Excerpt:

The liquid resistance starter cabinet is designed to provide smooth and controlled starting of motors using liquid resistance technology. It reduces starting current, prevents mechanical stress, and ensures reliable and safe motor operation in industrial applications.

Liquid Resistance Starter Cabinet: Ideal Smooth Start Solution for Medium and Large Motors


01 Product Overview

The Liquid Resistance Starter Cabinet is an advanced starting solution designed for medium and large wound-rotor asynchronous motors. It provides smooth, low-impact starting by inserting specially formulated liquid resistors into the rotor circuit and adjusting electrode positions to vary resistance.

This system effectively addresses the drawbacks of traditional starting methods such as direct-on-line or autotransformer start, including high starting currents and severe mechanical stress, ensuring safe and efficient motor start-up.

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02 Working Principle & Technical Features

1. Intelligent Starting Principle

The liquid resistance starter operates by inserting a liquid resistor into the motor rotor circuit. Upon receiving a start command, a small servo motor moves the electrodes, gradually reducing resistance.

Once the resistance reaches the minimum, the shorting contactor closes, directly connecting the motor rotor star point. This allows the motor to start smoothly with low current and high torque, minimizing grid impact.

2. Advantages of Liquid Resistance

  • Stepless Adjustment: Resistance can be adjusted continuously by changing electrode distance or electrolyte concentration.
  • High Thermal Capacity: Can perform 5–10 consecutive starts.
  • Low Starting Current: ≤1.3× rated current for wound-rotor motors.
  • Wide Voltage Adaptability: Can start even if supply voltage drops 10% below rated value.

03 Core Structure & Design Innovations

1. Modular Design

The cabinet features a modular design consisting of:

  • Cabinet Structure: Welded steel frame with reserved space for hydraulic and electrical components.
  • Liquid Resistor Tank: Houses liquid resistors and fixed electrodes; soft start is achieved by controlling electrode spacing.
  • Electrical Compartment: Contains low-voltage control and protection components.
  • Drive Mechanism: Typically uses a worm gear system for smooth, quiet operation.

2. Fully Enclosed Innovative Design

  • Sealed System: Prevents electrolyte evaporation with precision sealing of all joints.
  • Self-Circulating Cooling: Equipped with circulation pumps and internal piping to dissipate heat effectively.
  • Environmental Adaptability: Suitable for dry climates with annual precipitation below 200mm, ensuring reliable operation.

04 Performance Features & Advantages

  • Constant Current Soft Start: 2.5–3.5× rated current for cage rotor motors, reducing start-up heating.
  • Smooth, Shock-Free Start: Minimizes mechanical stress, extending motor and equipment life by ~30%.
  • High Start Success Rate: Unaffected by voltage fluctuations or load changes.
  • Minimal Grid Impact: Low voltage drop, no harmonic pollution.
  • Easy Operation & Maintenance: Fully automated, simple installation, and maintenance.

Compared to conventional oil-immersed, iron, or variable resistor starters, the liquid resistance starter offers superior start performance, reliability, and lifespan, and is simpler and maintenance-free compared to high-voltage soft starters.


05 Application Fields

  • Heavy Industry: Cement, metallurgy, mining, petroleum, chemical sectors for 75–10,000 kW wound-rotor motors.
  • Power & Water Industry: Auxiliary equipment in power plants, large pumps, compressors.
  • Special Conditions: Continuous multi-start applications, unstable or low-voltage grids.

Commonly used for ball mills, crushers, compressors, fans, and other heavy-load equipment.


06 Technical Specifications

ParameterSpecification
Applicable MotorWound-rotor asynchronous motor, squirrel-cage motor
Rated Voltage380V–12kV
Power Range75kW–10,000kW
Starting Current≤1.3× rated current (wound rotor), 2.5–3.5× rated current (squirrel cage)
Starting Time10–120 seconds, adjustable
Ambient Temperature-25℃–+50℃
Protection LevelIP20–IP54

07 Selection & Installation Guidelines

Selection Considerations

  • Motor model, rated power, rotor voltage/current, and rated speed.
  • Load characteristics and working conditions.
  • Installation environment requirements.
  • Appearance and cabinet color preferences.

Installation Environment

  • Stable, vibration-free location.
  • No corrosive gases or explosive hazards.
  • Tilt ≤5°.
  • Three-phase AC 380V±10%.
  • Special adaptations for temperatures < -5℃ or altitudes >2000m.

08 Maintenance & Troubleshooting

  • Regular Checks: Ensure electrolyte level within range; refill with distilled water if low.
  • Electrolyte Preparation: Adjust sodium carbonate solution concentration (typically 0.7–1.2%) based on load and motor parameters.
  • Protection Verification: Test overtemperature, low liquid level, and over-time protections.
  • Drive Mechanism Inspection: Ensure smooth operation, no jamming.

With its advanced technology, reliable performance, and smooth start capability, the Liquid Resistance Starter Cabinet is the ideal solution for medium and large industrial motors. It ensures safe, efficient, and long-lasting motor start-up, making it an essential choice for industries seeking reliable power and production stability.

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Simo Motor After-Sales Service Policy: Quality First, Customer Foremost

Sincere, Attentive, Dedicated — Simo Always Cares


Preface

Thank you for choosing Simo Motor products. As a company with many years of experience in motor manufacturing, Simo Motor always adheres to the principle of "Quality First, Customer Foremost." Through a comprehensive service system, we ensure that every customer enjoys efficient and professional after-sales support.

Our products have repeatedly been awarded provincial, municipal, and national honors such as “High-Quality Product,” “China Famous Brand Product,” “National Exemption from Inspection Product,” and “China Well-Known Trademark.” To further enhance customer experience, we have formulated this after-sales service policy, aimed at providing comprehensive, prompt, and satisfactory service guarantees.


1. Quality Assurance Commitment

Simo Motor strictly implements full quality control in accordance with international standards, national standards, industry standards, and corporate standards:

  • All products are manufactured under the effective operation of the GB/T 19001-2008/ISO 9001:2008 Quality Management System, ensuring rigorous inspection from raw material intake to final product delivery.

  • We guarantee that all products provided are brand new, unused, and meet the quality requirements stipulated in customer contracts.

  • We maintain a quality management system compliant with GB/T 19001-2000 idt ISO 9001:2000, ensuring its effective operation.


2. Pre-Sales Service

To help customers make the best choice, Simo Motor provides comprehensive pre-sales support:

  • Professional Technical Consultation: Responding to customer inquiries about motor products and technical issues.

  • Personalized Solutions: Objectively introducing Simo Motor product features and performance, and providing customized power solutions.

  • Comprehensive Product Information: Providing detailed quotations, drawings, and motor samples to help customers fully understand the product.


3. Ordering Instructions

To ensure the motor meets your usage requirements, please specify the following parameters when placing an order:

  • Basic Parameters: Motor model, rated power, rated voltage, number of poles, rated frequency.

  • Installation Environment: Protection level, cooling method, installation type, rotation direction, environmental conditions, cable exit position.

  • Usage Conditions: Installation altitude, working environment temperature, motor load type.

For special requirements, a separate technical agreement must be signed before placing an order. You may also call our customer service hotline 159-0292-3228 for professional guidance.


4. Warranty Policy Details

1. Warranty Period

Simo Motor provides a warranty of up to two years from the shipping date. Within this period, if the motor is damaged or cannot operate properly due to manufacturing defects, Simo Motor will repair or replace parts or the motor free of charge.

2. Warranty Coverage

  • The warranty covers product quality issues caused by our company, with free replacement of parts or free repair.

  • Warranty services require correct use and regular maintenance, following the original operation manual and recommended lubrication, cleaning, and care instructions.

3. Exclusions from Warranty

The following are not covered by the warranty:

  • Damage caused by non-designated personnel

  • Unauthorized modifications or self-repair

  • Use of non-official parts or software

  • Failure to follow operation manual instructions for use, handling, and maintenance

  • Damage caused by natural disasters (wind, fire, flood, earthquake, etc.)

  • Normal wear and tear under standard use


5. Post-Warranty Service

After the warranty expires, Simo Motor continues to provide service support:

  • Lifetime Paid Service: After the warranty period, if the product fails, we offer lifetime paid service, supplying consumable parts and components at cost price.

  • Regular Follow-Up: Our after-sales staff will periodically contact users to check product status and address potential issues.

  • Professional Repair Services: The company undertakes repair services for all types of motors, whether under warranty or not, providing professional maintenance and inspection.


6. Service Commitment and Standards

Simo Motor upholds the "Sincere, Attentive, Dedicated — Simo Always Cares" Three-Heart Service Philosophy, ensuring excellent customer experience through standardized service processes:

  • Professional Service Team: A dedicated team provides installation guidance, fault diagnosis, and repair services, ensuring efficient motor operation.

  • Rapid Response Mechanism: After receiving customer feedback, our after-sales team responds promptly and formulates quick solutions.

  • Full Tracking and Records: All service processes are documented to ensure traceability and continuous improvement of service quality.


7. Customer Complaint Channels

If you are not satisfied with Simo Motor’s services, please provide feedback through the following channels:

  • Direct complaints to the service department or headquarters

  • Call our customer service hotline: 159-0292-3228

We take every feedback seriously and continuously strive to improve our service quality.


Conclusion

Simo Motor will continue to provide high-quality products and professional after-sales service. Through a complete service system, we solve your concerns and ensure peace of mind. We firmly believe that only with customer success can Simo Motor grow. Choosing Simo Motor means choosing quality and trust.

Simo Motor — Dedicated Service, Creating the Future Together!

Simo Motor Brand Advantages: Outstanding Quality, Leading Innovation and Development in the Motor Industry

Over 60 Years of Professional Experience, Setting the Benchmark in the Motor Industry


Brand Heritage and Strength

Simo Motor (formerly Xi’an Motor Factory) was established in 1955. As one of the leading enterprises in China’s motor industry, it has over six decades of manufacturing experience and technical expertise. Today, the company has grown into a large-scale modern enterprise integrating motor product R&D, manufacturing, and sales. Its products are widely used in key sectors such as power, coal, petroleum, mining, metallurgy, railways, transportation, chemical, agriculture, water conservancy, and aviation.

With profound technical expertise and continuous innovation, Simo Motor has built a prestigious brand image in the motor industry. Its products are exported to more than 40 countries and regions, including North America, Europe, the Middle East, Southeast Asia, Africa, and Australia, earning trust and praise from global customers.


Core Technology Advantages

1. Leading R&D and Innovation Capability

Simo Motor treats technological innovation as the core driving force of enterprise development:

  • Professional R&D Team: Composed of senior engineers and technical experts focusing on cutting-edge motor technology research and applications.

  • Continuous Investment in Technology: 5%-7% of annual sales revenue is invested in R&D to ensure continuous innovation and product upgrades.

  • Patented Technology Achievements: Over 100 national patents, with multiple products receiving national and provincial science and technology progress awards.

  • Industry-Academia Collaboration: Strategic partnerships with renowned universities and research institutes to advance motor technology development.

2. Excellent Product Quality System

Simo Motor has established a robust quality assurance system to ensure each motor meets the highest standards:

  • International Certifications: ISO9001 Quality Management, ISO14001 Environmental Management, and OHSAS18001 Occupational Health and Safety certifications.

  • Strict Quality Control: 68 rigorous inspection processes from raw material procurement to final product delivery to ensure zero defects.

  • Advanced Testing Equipment: Equipped with international motor performance testing systems, vibration analyzers, noise measurement devices, and more.

  • Continuous Quality Improvement: Comprehensive feedback mechanisms for continuous optimization of production processes and product stability.


Product Advantages and Features

1. High-Efficiency Energy-Saving Technology

Simo Motor actively responds to national energy-saving policies with a series of high-efficiency products:

  • High-Efficiency Motor Series: Meets the national GB18613-2020 energy efficiency standards, with some products reaching IE4/IE5 ultra-high efficiency levels.

  • Energy-Saving Technology: Uses premium silicon steel, low-loss bearings, and efficient cooling systems to reduce operating energy consumption.

  • Intelligent Control Technology: Advanced variable frequency control systems optimize motor operation, improving energy savings by 15%-30%.

2. Outstanding Performance

Simo Motor products are known for high reliability, long service life, and low maintenance costs:

  • Powerful Output: Optimized electromagnetic design ensures high starting torque and strong overload capability.

  • Low Vibration and Noise: Dynamic balancing and noise reduction technologies ensure vibration and noise levels below national standards.

  • Strong Environmental Adaptability: Designed for harsh conditions with heat resistance, moisture-proof, and corrosion-resistant features.

  • Long Lifespan Design: Key components use specialized treatment and premium materials, with a design life exceeding 100,000 hours.

3. Comprehensive Product Series

Simo Motor provides a wide range of products to meet diverse customer needs:

  • High-Voltage Motors: Voltage levels of 6kV, 10kV, and power range 200–10,000 kW.

  • Low-Voltage Motors: Series such as YX3, YE3, YE4, with power range 0.55–1,000 kW.

  • Explosion-Proof Motors: Certified for use in flammable and explosive environments.

  • Special Motors: Customized for industries such as mining, metallurgy, and marine applications.

  • Non-Standard Customization: Strong ability to provide tailored solutions according to customer requirements.


Service System Advantages

Simo Motor has established a comprehensive customer service system:

  • Pre-Sales Technical Support: Professional selection guidance, solution design, and product demonstration.

  • In-Sales Support: Strict contract compliance, on-time delivery, and installation guidance.

  • After-Sales Guarantee: 24-month warranty, 24/7 technical support, 48-hour on-site service commitment.

  • Lifetime Maintenance Support: Customer equipment files maintained for full lifecycle service.


Industry Application Advantages

Simo Motor has extensive experience across key industries:

  • Power Industry: Provides reliable motors for thermal, hydro, and nuclear power.

  • Coal Industry: Explosion-proof motors certified for coal mine safety.

  • Petrochemical Industry: Corrosion-resistant and explosion-proof motors for harsh environments.

  • Metallurgy: High-overload, high-temperature resistant motors meet specialized equipment needs.

  • Transportation: Customized motors for railways, urban transit, and ports.


Brand Honors and Certifications

Simo Motor’s excellent product quality and market performance have earned multiple honors:

  • China Famous Brand Product, National Exemption from Inspection Product, China Well-Known Trademark

  • High-Tech Enterprise, Provincial Enterprise Technology Center

  • Multiple provincial and ministerial-level science and technology awards

  • Credit-worthy and trustworthy enterprise, AAA-level quality reputation


Conclusion

Choosing Simo Motor means choosing reliable quality, leading technology, and comprehensive service support. Over 60 years of professional accumulation have given Simo Motor deep technical expertise and rich industry experience, providing customers with the best motor products and complete power solutions.

In the future, Simo Motor will continue to adhere to the philosophy of “Quality First, Innovation Driven, Customer Foremost”, constantly improving product technology and quality, creating greater value for customers, and contributing to the development of China’s motor industry.

Simo Motor — Powerful, Efficient, and Fully Supported!

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