variable frequency wound rotor slip ring motor

Variable Frequency Wound Rotor Slip Ring Motor – Industrial Heavy-Duty Solution

Our variable frequency wound rotor slip ring motor has been shown to work well when your application needs high starting power with little impact on the grid. These motors, which were designed by Tellhow Shenyang Electric Machine Co., Ltd., offer 250% of their stated power when they first start up while using up to 60% less starting current than traditional designs. They are made to work in the harshest industrial settings, with power levels ranging from 160kW to 10,000kW and voltages from 400V to 13,800V. Our welding steel frame construction and flexible design make sure that our machines will work reliably for decades in heavy processing, mining, and making cement.

Why Choose Our Wound Rotor Slip Ring Motors?

Exceptional Starting Performance

You have a very important job to do: you need to start big loads without overloading your electricity system. This is taken care of by external rotor resistance control in our motors. This design lets high-inertia machines like ball mills and crushers move more smoothly while keeping your building's power distribution system safe.

Built for Continuous Heavy Duty

The conditions in which your equipment works are very harsh. We know that downtime costs you money and production.

Our motors feature:

• Welded steel plates make the structure more stable.
• Class F or H VPI shielding systems that can handle heat stress
• Slip ring systems that are reinforced and made to last 100,000 hours or more
• Better safety for bearings against shaft currents

True Variable Frequency Capability

These days, processes need to be flexible. These motors work perfectly whether you need to keep the speed steady or change the frequency. Voltage spikes from the VFD don't hurt the strengthened insulation as much as they would normal motors. Even when the engine is running at low RPM and high power, the right temperature is kept by separate cooling systems.

Technical Specifications

Key Applications

Your industry demands reliability. Our variable frequency wound rotor slip ring motor excels in:

• Crushers, elevators, and air devices are used in mining.
• Ball mills, rotating kilns, and grinding of raw materials are used to make cement.
• Metallurgy: Rolling mills, flying knives, and moving things around
• Big pumps and fans are used to treat water.
• For petrochemicals, heavy-duty fans and compressors

The motor's ability to provide high breakaway power while keeping the electrical system stable is useful in all situations.

Advanced Engineering Features

Intelligent Thermal Management

Failures caused by too much heat are not an option. Our cooling methods change based on the conditions of use:

• IC416 forced ventilation maintains airflow regardless of motor speed
• IC81W water cooling handles extreme ambient temperatures
• Multiple air-to-water cooling options for sealed environments

Precision Manufacturing

Dimensional accuracy matters for smooth operation. We maintain:

• Rotor balancing to ISO 1940 Grade G2.5
• Vibration levels below 2.3mm/s per IEC 60034-14
• Noise optimization for industrial workplace compliance

Comprehensive Protection Options

Your process monitoring requirements vary by application. We offer:

• PT100/PTC thermal sensors for winding protection
• Space heaters preventing condensation during shutdowns
• SPM vibration sensors for predictive maintenance programs
• Insulated bearings mitigating EDM bearing damage

Customization Capabilities

No two operations are identical. We provide ODM/OEM services including:

• Custom voltage and frequency configurations
• Modified mounting arrangements for tight spaces
• Specialized coatings for corrosive environments
• Integration with your existing control systems
• Small-batch production for unique specifications

Performance You Can Measure

Energy Efficiency

Operating costs matter. Our high-efficiency designs reduce energy consumption by 15-20% compared to older motor technologies. When coupled with variable frequency drives, you gain precise process control and additional energy savings through speed optimization.

Reliability Metrics

Your production schedule depends on equipment availability. Our variable frequency wound rotor slip ring motor deliver:

• Mean Time Between Failures (MTBF) exceeding industry standards
• Simplified maintenance access for brush and slip ring inspection
• Extended service intervals reducing labor costs
• Comprehensive spare parts availability

Global Support Network

You operate across multiple sites and time zones. Our support infrastructure includes:

• Regional technical service centers
• 24/7 engineering consultation
• Comprehensive documentation in multiple languages
• Training programs for your maintenance teams
• Lifecycle support from installation through decommissioning

Manufacturing Excellence

Tellhow Shenyang Electric Machine operates a 190,000-square-meter manufacturing facility with 8 million kW annual production capacity. Our 500 million RMB registered capital supports continuous investment in:

• Advanced CNC machining centers
• Automated winding and impregnation systems
• State-of-the-art testing laboratories
• Quality management systems certified to ISO9001-2015

This infrastructure ensures consistent quality across 49 motor series and over 2,100 specifications.

Frequently Asked Questions

Q: What advantages does a wound rotor design offer over Squirrel Cage Motors?

A: The wound rotor configuration allows external resistance control, giving you superior starting torque (up to 250% of rated torque) while drawing significantly lower starting current. This prevents voltage dips that affect other equipment on your electrical system.

Q: Can these motors operate with variable frequency drives?

A: Absolutely. Our product features reinforced VPI insulation meeting IEC 60034-18-41 standards for VFD applications. The insulation withstands voltage spikes and high dv/dt rates that occur with PWM switching.

Q: How often do slip rings and brushes require maintenance?

A: Maintenance intervals depend on operating conditions. Typical inspection intervals range from 3,000 to 6,000 operating hours. The modular design allows quick access and replacement without complete motor disassembly.

Q: What protection exists against shaft currents in VFD applications?

A: We install insulated bearings on the non-drive end and provide grounding brush options for the drive end. This two-layer approach effectively diverts capacitive currents that would otherwise cause bearing erosion.

Q: How do you ensure quality in high-voltage motors?

A: Every motor undergoes rigorous factory acceptance testing including insulation resistance measurement, polarization index testing, partial discharge analysis, dynamic balancing, and full-load heat run testing. We provide complete test reports with each shipment.

Q: What cooling method should I specify for low-speed operation?

A: For prolonged low-speed, high-torque applications, specify IC416 (independent electric fan) or water cooling methods. These maintain consistent cooling performance regardless of rotor RPM.

Q: Can you supply motors for hazardous locations?

A: Yes, we manufacture explosion-proof variants meeting ATEX, IECEx, and NEC classifications for hazardous gas and dust environments.

Contact Us

Contact our engineering team at sxmotor@yeah.net to discuss your specific requirements for variable frequency wound rotor slip ring motor.