China Factory Z4 Series Direct Current Electric Motors
Professional Manufacturer of Industrial DC Motors Including Z4-450-22 630kW 440V, Z4-280-11 250kW, and Customized Heavy-Duty Direct Current Motors for Rolling Mills, Cement Plants, Steel Industry, Mining, Conveyors, Crushers, Paper Machines, Extruders and Large Industrial Equipment.
Industrial Z4 Series DC Motor Manufacturer from China
The Z4 Series Direct Current Motor represents one of the most reliable heavy-duty DC motor platforms developed for demanding industrial applications. Designed with advanced electromagnetic technology, precision manufacturing processes, and high-grade insulation systems, the Z4 Series provides exceptional operational stability, excellent overload capability, high starting torque, and accurate speed regulation for continuous industrial production.
Manufactured by Sealocean Group, the Z4 Series has been supplied to customers worldwide for applications requiring dependable performance under severe operating conditions. These motors are widely installed in cement factories, steel mills, mining operations, paper manufacturing plants, plastic extrusion lines, cable production facilities, metallurgy, chemical plants, ports, and material handling systems.
Our factory has accumulated decades of engineering experience in designing, manufacturing, testing, and exporting industrial electric motors. Every motor is manufactured under strict quality control procedures to ensure consistent reliability, long service life, and compliance with international industrial standards.
Main Featured Models
| Model | Rated Power | Voltage | Current | Speed | Cooling | Protection |
|---|---|---|---|---|---|---|
| Z4-450-22 | 630 kW | 440 V | 1525 A | 700 / 1500 RPM | IC06 | IP21S |
| Z4-280-11 | 250 kW | 440 V | — | 1500 / 2000 RPM | IC06 | IP21S |
Core Technical Advantages
High Starting Torque
Excellent starting performance for crushers, rolling mills, hoists and heavy industrial machinery requiring high torque at low speed.Accurate Speed Regulation
Wide speed adjustment range enables precise production process control while maintaining stable torque output.Heavy Duty Continuous Operation
Designed for S1 continuous duty under harsh industrial environments with long operating life.Premium Insulation
Class F insulation system combined with advanced vacuum pressure impregnation technology ensures excellent dielectric strength and thermal performance.Flexible Cooling Solutions
Available in IC06, IC17, IC37, IC410, IC666 and IC86W cooling arrangements according to application requirements.Global Industrial Standards
Designed according to IEC standards with high manufacturing precision for worldwide industrial applications.Typical Industrial Applications
- Steel Rolling Mills
- Hot Strip Mills
- Cold Rolling Production Lines
- Cement Ball Mills
- Vertical Roller Mills
- Mining Conveyors
- Crusher Systems
- Paper Machines
- Plastic Extruders
- Cable Manufacturing Equipment
- Rubber Machinery
- Heavy Hoisting Equipment
- Port Handling Systems
- Metallurgical Production Lines
- Power Generation Auxiliary Equipment
Customized voltage, power, cooling system, protection level, mounting arrangements and OEM manufacturing services are available for international customers.
Electrical Performance and Operating Characteristics
The Z4 Series Direct Current Motor has been engineered for demanding industrial applications requiring precise speed regulation, high starting torque, and continuous heavy-duty operation. Every motor is manufactured using precision laminated magnetic steel, optimized electromagnetic design, high-grade copper windings, and advanced vacuum pressure impregnation (VPI) insulation technology to maximize efficiency, reliability, and service life.
Unlike conventional induction motors, the Z4 Series DC Motor provides excellent low-speed torque characteristics while maintaining smooth acceleration and stable speed regulation across a wide operating range. These characteristics make the motor especially suitable for production processes where accurate speed control directly affects product quality and equipment productivity.
Standard Electrical Operating Conditions
| Parameter | Specification |
|---|---|
| Motor Series | Z4 Direct Current Motor |
| Rated Duty | S1 Continuous Duty |
| Rated Voltage | 160V / 220V / 400V / 440V / 660V (Custom Available) |
| Field Voltage | 180V |
| Rated Speed | 200~3000 RPM |
| Speed Regulation | Constant Torque + Constant Power |
| Insulation Class | Class F |
| Temperature Rise | Class B or F |
| Protection | IP21S (Optional IP23 / IP44 / IP54) |
| Cooling | IC06 / IC17 / IC37 |
| Excitation | Separate Excitation |
| Maximum Altitude | 1000 meters |
| Ambient Temperature | -15°C to +40°C |
| Applicable Standard | IEC 60034 / GB755 |
Wide Speed Regulation Capability
One of the most significant advantages of the Z4 Series is its exceptionally wide speed regulation capability. The motor maintains constant torque by adjusting armature voltage below the rated base speed and maintains constant output power through field weakening above the rated speed.
This flexible operating characteristic allows one motor to perform multiple production tasks while reducing mechanical transmission complexity and improving process stability.
- Excellent low-speed stability
- Constant torque operation
- Wide constant power range
- Smooth acceleration and deceleration
- High positioning accuracy
- Outstanding overload capability
- Fast dynamic response
- Minimal speed fluctuation under varying loads
Advanced Electromagnetic Design
The stator core adopts high-quality laminated silicon steel sheets to minimize eddy current losses while increasing magnetic efficiency. Precision machining ensures accurate pole spacing, reducing vibration, electrical noise, and commutation losses.
The armature winding utilizes high-purity electrolytic copper conductors with optimized slot design, resulting in lower resistance, improved efficiency, and better thermal performance during continuous industrial operation.
For larger frame sizes including Z4-315, Z4-355, Z4-400 and Z4-450, compensating windings are incorporated as standard to improve commutation quality during rapid load changes.
Reliable Insulation System
Industrial environments often expose motors to dust, vibration, thermal cycling, and continuous heavy loading. Therefore, the Z4 Series utilizes a premium Class F insulation system together with advanced vacuum pressure impregnation technology.
Vacuum Pressure Impregnation
Complete resin penetration provides superior insulation integrity and improved mechanical strength.Excellent Heat Dissipation
Optimized ventilation channels efficiently remove heat from the stator and armature.Moisture Resistance
Improved resistance against humidity and industrial contaminants.Long Service Life
Reduced insulation aging under continuous industrial operation.Cooling System Options
Different industrial applications require different cooling arrangements. The Z4 Series provides multiple internationally recognized cooling methods.
| Cooling Method | Description | Typical Applications |
|---|---|---|
| IC06 | Separate Forced Ventilation | Steel Plants, Rolling Mills |
| IC17 | Independent Forced Cooling | Mining Equipment |
| IC37 | Separate Air Circulation | Heavy Continuous Production |
| IC410 | Totally Enclosed Frame Cooling | Dusty Workshops |
| IC666 | Air-to-Air Heat Exchanger | Chemical Industry |
| IC86W | Air-to-Water Heat Exchanger | High Temperature Workshops |
Mechanical Construction
The Z4 Series motor housing is manufactured from high-strength steel with precision machining to ensure excellent rigidity, accurate shaft alignment, and minimal vibration. Bearings are carefully selected according to radial and axial load requirements to maximize operational reliability.
- Heavy-duty fabricated steel frame
- Precision dynamic balancing rotor
- Large terminal box for convenient wiring
- Reliable grounding terminal
- Flexible mounting positions
- Easy maintenance design
- Replaceable brush assembly
- Industrial-grade commutator construction
Why DC Motors Continue to Dominate Heavy Industrial Drives
Although AC variable frequency drives have become increasingly common, DC motors remain the preferred solution in many heavy industrial applications where extremely high starting torque, fast acceleration, precise speed regulation, and frequent load variations are required.
Industries including steel manufacturing, cement production, mining, paper processing, cable manufacturing, and rubber machinery continue to rely on DC drive systems because of their proven reliability and outstanding torque characteristics under demanding operating conditions.
Many existing production lines around the world were originally designed around DC drive technology. Replacing only the motor while maintaining the existing drive system significantly reduces investment costs and minimizes production downtime.
Typical Industries Served
Steel Industry
Rolling mills, strip mills, reheating lines, billet handling equipment.Cement Plants
Ball mills, rotary kilns, crushers, clinker conveyors.Mining
Ore conveyors, crushers, grinding mills, hoisting systems.Paper Industry
Paper machines, rewinders, coating machines.Plastic Processing
Extruders, mixers, calenders, pelletizing equipment.Port Equipment
Container cranes, ship loaders, heavy lifting systems.Metallurgy
Continuous casting, furnace charging equipment.Power Generation
Auxiliary drives, heavy conveying systems.Global Engineering Project Reference Library
Over the past two decades, Sealocean Group has supplied industrial direct current motors for customers operating in metallurgy, mining, cement, paper manufacturing, plastics processing, ports, power generation, and heavy machinery industries. The following engineering references are representative application examples prepared for technical demonstration purposes, illustrating the adaptability of different Z4 Series DC motor configurations under various industrial operating conditions.
Each project demonstrates how proper motor selection, cooling configuration, excitation design, and commissioning can significantly improve production efficiency, reduce maintenance costs, and extend equipment service life.
Engineering Case 01 — Cement Ball Mill Main Drive
| Project Information | |
|---|---|
| Project Location | Indonesia |
| Industry | Cement Manufacturing |
| Motor Model | Z4-450-22 |
| Rated Power | 630 kW |
| Voltage | 440 V |
| Speed | 700 / 1500 RPM |
| Cooling | IC06 |
| Protection | IP21S |
Customer Requirement
The customer required a replacement motor for a cement grinding ball mill operating continuously under heavy mechanical loads. The original imported motor had experienced repeated commutation failures and long maintenance shutdowns.
Engineering Solution
- Custom shaft dimensions
- Enhanced Class F insulation
- Dynamic rotor balancing
- Optimized commutator assembly
- Forced ventilation IC06
- Factory full-load testing
Project Result
After commissioning, the grinding system achieved smoother startup, lower vibration levels, improved production stability, and reduced maintenance frequency throughout continuous operation.
Engineering Case 02 — Plastic Extrusion Production Line
| Project Information | |
|---|---|
| Country | Türkiye |
| Industry | Plastic Extrusion |
| Motor Model | Z4-280-11 |
| Rated Power | 250 kW |
| Voltage | 440 V |
| Rated Speed | 1500 / 2000 RPM |
| Duty | S1 Continuous |
Customer Requirement
The extrusion process required precise speed regulation while maintaining stable output torque over long production cycles.
Engineering Solution
- Independent excitation system
- Precision balancing
- Improved ventilation efficiency
- Optimized brush assembly
- Customized coupling dimensions
Project Result
Production stability improved significantly, extrusion quality became more consistent, and equipment downtime caused by speed fluctuation was minimized.
Engineering Case 03 — Steel Rolling Mill Main Drive
| Project Information | |
|---|---|
| Country | India |
| Industry | Steel Rolling Mill |
| Motor Model | Z4-355-31 |
| Rated Power | 400 kW |
| Voltage | 440 V |
| Cooling | IC17 |
| Protection | IP21S |
Customer Challenge
The rolling line required extremely high starting torque with rapid forward and reverse rotation during continuous steel production.
Engineering Improvements
- Compensating winding
- Enhanced commutation
- Heavy-duty bearings
- Low vibration rotor
- Industrial balancing verification
Operating Results
The rolling mill demonstrated stable torque output, faster acceleration, reduced maintenance requirements, and improved production efficiency.
Engineering Case 04 — Mining Crusher Drive
| Project Information | |
|---|---|
| Country | Chile |
| Industry | Mining |
| Motor Model | Z4-315-41 |
| Rated Power | 315 kW |
| Voltage | 440 V |
| Cooling | IC06 |
Project Background
Mining crushers experience frequent impact loading and require excellent overload capability during startup.
Customized Configuration
- Reinforced shaft
- Heavy-duty bearing system
- Improved cooling airflow
- High-strength laminated core
- Premium insulation treatment
Project Performance
The crusher achieved reliable operation under severe impact loads while reducing unexpected shutdowns.
Engineering Case 05 — Bulk Material Conveyor System
| Project Information | |
|---|---|
| Country | South Africa |
| Industry | Bulk Material Handling |
| Motor Model | Z4-400-32 |
| Rated Power | 560 kW |
| Voltage | 440 V |
| Duty | S1 Continuous |
Customer Requirement
Continuous conveying over long distances with stable speed control and minimal maintenance interruptions.
Solution
- Independent ventilation
- Continuous duty design
- Heavy-duty commutator
- Low maintenance brush holder
- Customized mounting arrangement
Result
Continuous conveyor availability increased while reducing maintenance intervals and improving overall production efficiency.
Engineering Case 06 — Hot Rolling Steel Production Line
| Project Information | |
|---|---|
| Country | Vietnam |
| Industry | Metallurgy |
| Motor Model | Z4-450-42 |
| Rated Power | 800 kW |
| Voltage | 660 V |
| Cooling | IC37 |
| Protection | IP21S |
Project Challenge
High-temperature steel rolling required continuous operation with frequent speed changes and excellent overload performance.
Technical Solution
- Optimized excitation circuit
- Industrial-grade laminated magnetic core
- Improved cooling efficiency
- Precision commutator machining
- Factory full-load acceptance testing
Commissioning Result
The production line achieved reliable continuous operation with smooth acceleration, excellent speed regulation, and long-term operating stability under demanding metallurgical conditions.
Typical Industrial Equipment Driven by Z4 Series DC Motors
Steel Rolling Mills
Hot rolling mills, cold rolling mills, wire rod mills, billet mills and plate mills.Cement Plants
Ball mills, vertical mills, clinker crushers, rotary kilns and conveyor systems.Mining Industry
Ore crushers, grinding mills, mine hoists, belt conveyors and mineral processing equipment.Paper Industry
Paper machines, rewinders, coating lines, calenders and pulp processing systems.Plastic Industry
Extruders, mixers, granulators, calenders and sheet production lines.Port & Heavy Lifting
Container cranes, ship unloaders, hoists, cable winches and travel drives.Engineering Advantages of Sealocean Z4 DC Motors
- Over 20 years of industrial motor manufacturing experience.
- OEM and customized engineering solutions for international projects.
- Comprehensive testing including no-load, full-load, insulation, vibration and temperature-rise inspections.
- Support for IEC, GB and customized industrial specifications.
- Flexible voltage, shaft, flange, mounting and cooling configurations.
- Professional export packaging and worldwide technical support.
- Applications covering steel, mining, cement, power generation, ports, petrochemical and paper industries.
- Reliable long-term operation in demanding heavy-duty industrial environments.
Frequently Asked Questions (FAQ)
1. What is the Z4 Series DC Motor mainly used for?
The Z4 Series DC Motor is designed for heavy-duty industrial applications requiring high starting torque, precise speed regulation, and continuous operation. Typical applications include rolling mills, cement plants, mining conveyors, crushers, paper machines, plastic extruders, cable manufacturing lines, metallurgy equipment, and hoisting systems.
2. Which voltage ratings are available?
Standard armature voltages include 160V, 220V, 400V, 440V, and 660V. Customized voltages can also be designed according to customer specifications.
3. What is the standard insulation class?
Standard insulation is Class F with excellent thermal resistance. Class H insulation is available for high-temperature applications.
4. What protection ratings are available?
Standard protection is IP21S. Optional protection includes IP23, IP44, IP54, and customized designs depending on environmental conditions.
5. Which cooling methods are available?
Available cooling methods include IC06, IC17, IC37, IC410, IC666, and IC86W.
6. Can the motor be customized?
Yes. Shaft dimensions, mounting arrangements, flange sizes, cooling systems, voltage, speed, insulation, encoder installation, tachogenerator, and other accessories can all be customized.
7. Which standards are followed?
Products are manufactured according to IEC 60034, GB755, ISO quality systems, and customer project specifications.
8. Is OEM manufacturing available?
Yes. Sealocean Group provides OEM and ODM manufacturing for distributors, engineering companies, EPC contractors, and industrial equipment manufacturers worldwide.
9. What testing is performed before shipment?
Every motor undergoes dimensional inspection, insulation resistance testing, no-load testing, vibration analysis, temperature-rise verification, balancing, and routine factory acceptance testing before delivery.
10. What industries commonly use Z4 motors?
Steel, mining, cement, metallurgy, ports, paper manufacturing, plastics, rubber processing, cable production, power generation, water treatment, and heavy machinery industries.
Why Choose Sealocean Group?
Professional Manufacturing
Over two decades of experience in manufacturing industrial electric motors for demanding global applications.Customized Engineering
Complete engineering customization for voltage, speed, shaft dimensions, mounting, cooling, and industrial standards.Strict Quality Control
Every motor is inspected from raw materials through final performance testing before shipment.Global Export Experience
Products have been supplied to customers in Asia, Europe, South America, Africa, the Middle East, and CIS markets.Fast Technical Support
Professional engineers provide selection guidance, technical documentation, installation recommendations, and after-sales assistance.Long Service Life
Designed for reliable continuous operation under harsh industrial environments with reduced maintenance costs.Manufacturing & Quality Assurance
Every Z4 Series DC Motor is manufactured using precision CNC machining, automated winding equipment, dynamic balancing systems, and computerized electrical testing facilities. Strict inspection procedures are applied throughout production to ensure consistent quality and dependable performance.
| Manufacturing Capability | Description |
|---|---|
| CNC Machining | High-precision machining for stator, rotor, shaft, and bearing components. |
| Rotor Dynamic Balancing | Reduced vibration and smoother operation at rated speed. |
| Vacuum Pressure Impregnation | Improved insulation strength and moisture resistance. |
| Routine Testing | Electrical, mechanical, vibration, temperature-rise, and insulation verification. |
| Packaging | Export-grade wooden crates with anti-moisture protection. |
Industrial Certifications
- ISO 9001 Quality Management System
- IEC 60034 Compliance
- GB755 Electrical Machine Standards
- CE Compliance (available according to project requirements)
- Factory Acceptance Testing (FAT)
- Routine Test Reports
- Material Certificates Available Upon Request
- OEM Technical Documentation Support
Spanish Summary (Resumen en Español)
Los motores de corriente continua de la serie Z4 están diseñados para aplicaciones industriales de trabajo pesado que requieren un alto par de arranque, regulación precisa de velocidad y funcionamiento continuo. Son ampliamente utilizados en acerías, fábricas de cemento, minería, fabricación de papel, extrusión de plásticos, equipos portuarios y sistemas de transporte industrial.
Sealocean Group ofrece soluciones personalizadas para tensión, velocidad, eje, sistema de refrigeración, nivel de protección y configuración mecánica, proporcionando productos confiables para clientes de todo el mundo.
- Motor CC Serie Z4
- Alta eficiencia
- Servicio continuo S1
- Protección IP21S / IP23 / IP54
- Refrigeración IC06 / IC17 / IC37
- Fabricación OEM
- Exportación internacional
Resumo em Português
Os motores de corrente contínua da Série Z4 foram desenvolvidos para aplicações industriais pesadas que exigem elevado torque de partida, controle preciso de velocidade e operação contínua. São amplamente utilizados em siderúrgicas, fábricas de cimento, mineração, papel e celulose, extrusão de plástico, equipamentos portuários e sistemas de transporte industrial.
A Sealocean Group fornece soluções personalizadas para tensão, potência, velocidade, sistema de refrigeração, grau de proteção e configurações mecânicas, atendendo clientes industriais em diversos países.
- Motor CC Série Z4
- Alta confiabilidade
- Classe F de isolamento
- Serviço contínuo S1
- Proteção IP21S
- Refrigeração IC06 / IC17 / IC37
- OEM & Exportação Global
Industrial Applications
The Z4 Series DC Motor is widely applied in the following industries:
Contact Sealocean Group for Industrial DC Motor Solutions
Whether you require a standard Z4 Series DC Motor or a fully customized industrial drive solution, our engineering team is ready to assist with motor selection, technical consultation, OEM manufacturing, replacement of imported motors, and complete project support.
Request a Free Technical Proposal
✔ Motor Selection Support
✔ OEM & ODM Manufacturing
✔ Replacement for Imported DC Motors
✔ Engineering Drawings
✔ Factory Testing Reports
✔ Worldwide Export Packaging
✔ Fast Technical Response
Email: [email protected]
Website: www.sealocean-international.com
Related Industrial Products
Helpful Industrial Resources
The following technical resources provide additional information regarding electric motors, efficiency standards, industrial drive systems, and international electrical engineering practices.
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- Professional China Industrial Motor Manufacturer
- More Than 20 Years Manufacturing Experience
- OEM & Customized Engineering
- Worldwide Export Service
- Professional Technical Support
- Strict Quality Inspection
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