ac wound rotor motor
Voltage range：380V±5%
Power range：55-355 kW
Protection level：IP23，IP54
Application：This series of motors can be used to drive various machinery. Such as ventilators, compressors, water pumps, crushers, cutting machine tools and other equipment, and can be used as prime movers in coal mines, machinery industries, power plants and various industrial and mining enterprises.
Advantage：This series of motors has the advantages of high efficiency, energy saving, low noise, small vibration, light weight, reliable performance, and convenient installation and maintenance.
Certificate：Its power level and installation dimensions comply with IEC standards.
Others： SKF, NSK, FAG bearings can be replaced according to customer requirements.
- Product Description
AC Wound Rotor Motor Manufacturer and Supplier
The ac wound rotor motor addresses this critical need through its unique slip ring construction, enabling external resistance control for superior starting performance. Unlike standard squirrel-cage designs, wound rotor motors deliver controlled heavy-load startup capabilities essential for mining, cement production, and material handling operations. Shaanxi Qihe Xicheng Electromechanical Equipment Co., Ltd. specializes in providing reliable power equipment solutions backed by over 20 years of industry experience and partnerships with 30+ global motor manufacturers including ABB, Siemens, Wolong, and XEMC.
Pain Points vs. Solutions
Your Challenge: Traditional motors cause voltage drops during startup, tripping circuit breakers and damaging equipment.
Our Solution: Wound rotor design allows gradual resistance reduction, limiting inrush current while maintaining strong starting torque.
Your Challenge: Fixed-speed motors cannot adapt to varying load requirements, wasting energy.
Our Solution: Rotor circuit resistance adjustment enables stepless speed control for operational flexibility.
Your Challenge: Direct-start motors fail with heavy mechanical loads like crushers or ball mills.
Our Solution: External starting rheostat connections deliver up to 2.5x rated torque at startup without overheating.
Technical Advantages of ac wound rotor motor
Our YR series wound rotor motors incorporate precision-engineered features:
· Slip Ring Assembly: High-conductivity copper rings with self-lubricating carbon brushes ensure stable current transfer
· Thermal Management: Enhanced ventilation systems and optimized winding design prevent overheating during extended speed regulation
· Bearing Options: SKF, NSK, FAG premium bearings available for extreme-duty applications
· Efficiency Standards: Compliant with IEC power efficiency requirements while maintaining compact dimensions
· Protection Grades: IP23 and IP54 enclosures protect against dust and moisture ingress
The wound rotor configuration reduces starting current to 1.5-2.0 times rated current compared to 5-7 times in squirrel-cage motors.
Production Process
Quality control governs every manufacturing stage:
1. Material Selection: Electromagnetic steel sheets and copper conductors are strictly inspected
2. Winding Accuracy The rotors are wound using CNC controlled winders for balanced three phase resistance
3. Slip Ring Machining: Brush wear and sparking are reduced by mirror-polished surfaces
4. Dynamic Balancing: Computer controlled testing reduces vibration in all speed ranges
5. Load Testing: Full-voltage functional tests confirm thermal performance and torque curves
Factory management solutions coupled with SAP track component traceability from raw material to final assembly.
Industry Applications
Wound rotor motors excel in demanding environments:
· Mining Operations: Hoists, conveyors, ventilation fans requiring soft-start capabilities
· Cement Plants: Ball mills, crushers, rotary kilns with high inertia loads
· Steel Mills: Rolling equipment, heavy-duty pumps needing frequent speed adjustments
· Power Generation: Induced draft fans, coal pulverizers in thermal plants
· Marine Systems: Windlass mechanisms and cargo handling equipment
The YR series handles power requirements from 55kW to 355kW across 380V±5% voltage networks.
Customization Capabilities
We tailor solutions to your specific requirements:
· Voltage and frequency modifications for international standards
· Shaft extension designs for specialized coupling systems
· Custom mounting configurations (foot, flange, vertical)
· Climate-specific treatments (tropical, high-altitude, marine)
· Rotor resistance value adjustments for optimized speed ranges
· Cable entry position variations
Our ac wound rotor motor engineering team collaborates with you to adjust dimensions and specifications while maintaining certification compliance.
Reliability Testing & Certifications
All products undergo comprehensive validation:
· Quality Certifications: CCC, CE, ISO9001:2000, CRCC railway certification
· Environmental Standards: ZDHY management system compliance
· International Approvals: UL, GOST certifications for global markets
· Performance Testing: Temperature rise, insulation resistance, vibration analysis, protection grade verification
30-day return policy and dedicated support seven days weekly ensure risk-free purchasing.
Why Choose XCMOTOR
Proven Supply Chain: Direct access to original components from trusted global brands guarantees authenticity.
Technical Expertise: Two decades of motor application engineering translates customer needs into optimal solutions.
Comprehensive Service: From initial specification consultation through installation support and rapid troubleshooting response.
Competitive Advantages: Factory-direct pricing, flexible production scheduling, and multimodal transportation options reduce total ownership costs.
Long-Term Partnership: We solve not just today's motor requirements but evolve solutions as your operations grow.
FAQ
Q：What is the core advantage of YR series wound rotor motor compared with squirrel-cage Y motor?
A：The YR motor adopts wound rotor + slip ring structure. It can connect external starting rheostat to rotor circuit, delivering large starting torque with low starting current, which greatly reduces impact on power grid. It also supports wide-range speed regulation via rotor series resistance, making it ideal for heavy-load startup equipment.
Q：Can we short-circuit the rotor winding directly to start the motor without starting resistance?
A：Strictly prohibited. Direct short-circuit startup will generate huge rotor current, causing severe overheating of rotor winding and burning slip rings. Standard operation requires matching three-phase starting resistance box connected to slip rings before power-on, then gradually cutting resistance as speed rises.
Q：Is slight sparking on slip ring normal during operation?
A：Tiny, uniform dot sparks are normal friction discharge between carbon brush and slip ring. Heavy arc sparking indicates faults like worn brushes, slip ring oxidation, or unbalanced rotor resistance requiring immediate inspection.
Q：Can YR motor adjust speed continuously?
A：Yes, stepless speed change within certain ranges by changing rotor series resistance. Low initial investment but extra energy loss occurs. For long-term high-efficiency speed regulation, cascade speed control or inverter schemes work better.
Q：What common faults lead to low speed & weak torque after startup?
A：Main causes include rotor circuit faults (loose brush contact, broken wire), three-phase voltage imbalance, mechanical overload, or incorrect wiring. Check slip ring and brushes first, then test rotor resistance and input voltage.
Contact Us
Ready to upgrade your heavy-load startup systems with ac wound rotor motor technology? Our specialists will recommend specific brand, series, and model configurations matched to your application demands.
Email: XCMOTORs@163.com
