Wound Rotor Induction Motors
Protection level：IP54
Voltage range：3000V±5%,3300V±5%,6000V±5%,6600V±5%,10000V±5%,11000V±5%
Power range：200-4500 kW
Application：hoist, rolling mill, wire drawing machine.
Advantage：low noise, small vibration, reliable performance, easy installation and maintenance.
Standard: This series of products complies with JB/T10314.2-2002 standards.
Others： SKF, NSK, FAG bearings can be replaced according to customer requirements.
- Product Description
Wound Rotor Induction Motors – YRKK Series High-Voltage Solution for Heavy-Load Industrial Drives
Wound Rotor Induction Motors in the YRKK series are designed for industrial drives where heavy-load starting and long-term reliability are critical priorities. Supplied by Shaanxi Qihe Xicheng Electromechanical Equipment Co., Ltd., this series covers 200–4500 kW with voltage options from 3000 V to 11000 V (±5%), protection to IP54, and compliance with JB/T10314.2-2002. Applications include hoists, rolling mills, ball mills, and wire drawing machines.
Manufacturer Background
Shaanxi Qihe Xicheng Electromechanical Equipment Co., Ltd. has supplied industrial power equipment for over 20 years. The company maintains long-term sourcing partnerships with more than 30 motor manufacturers, including ABB, Siemens, Wolong, NEC, SIMO, PINXING, XEMC, and CHANGSHA, and manages procurement through an SAP factory management system.
Products are selected based on end-user load requirements — with priority given to energy efficiency, stable output, and parts interchangeability. The YRKK series is backed by certifications covering both domestic and international compliance requirements: CCC, CE, ISO9001:2000, CRCC, CQC, UL, GOST, and China Energy Saving Certification.
Common Pain Points and How YRKK Addresses Them
Pain Point | YRKK Series Response |
High starting current destabilizes grid | Starting current controlled to 2.5–3× rated current (vs. 6–8× for squirrel-cage motors) |
Voltage dips affect nearby equipment | Staged soft-starting via external resistor connected through slip rings |
Equipment cannot start under full load | Starting torque of 1.8–2.2× rated torque supports full-load startup |
Slip ring accessibility complicates servicing | Slip rings and brushes are externally accessible for routine inspection |
Rotor insulation difficult to test | Insulation testing via slip ring leads without motor disassembly |
Bearing brand incompatibility with existing inventory | SKF, NSK, or FAG bearings available based on customer specification |
Technical Advantages
The YRKK series uses a wound rotor structure where rotor windings connect to an external starting resistor through slip rings. This allows direct control over starting current and starting torque — a capability that squirrel-cage motors cannot provide without additional voltage-reduction devices.
Starting current is held between 2.5 and 3 times the rated value. This protects the high-voltage power grid and prevents voltage dips from disrupting other connected equipment during startup.
Starting torque reaches 1.8–2.2× rated torque, enabling fully loaded equipment — such as ball mills, crushers, and hoists — to start smoothly under working conditions.
Technical Specifications
Parameter | Specification |
Series | YRKK |
Protection Level | IP54 |
Power Range | 200–4500 kW |
Voltage Range | 3000 V, 3300 V, 6000 V, 6600 V, 10000 V, 11000 V (±5%) |
Starting Current | 2.5–3× rated current |
Starting Torque | 1.8–2.2× rated torque |
Standard | JB/T10314.2-2002 |
Bearing Options | SKF / NSK / FAG (customer-specified) |
Noise & Vibration | Low-noise, low-vibration design |
Production and Quality Process
Each YRKK motor follows a structured manufacturing process managed through an SAP system. Stator windings and bearing seats follow standardized dimensional specifications, keeping replacement parts interchangeable across units.
Rotor windings are wound and connected to slip rings with insulation treatment verified under high-voltage conditions. Core components pass electrical, mechanical, and insulation checks prior to final assembly. Bearing selection follows standardized dimensions, and customers can specify SKF, NSK, or FAG brands to align with existing site inventory.
Industry Applications
The YRKK series Wound Rotor Induction Motors is suited to industries where starting conditions are demanding and downtime is costly.
· Mining & Metallurgy — ball mills, crushers, and hoists requiring frequent heavy-load starts
· Steel Industry — rolling mills needing controlled acceleration under full load
· Wire & Cable Manufacturing — wire drawing machines with variable tension requirements
· Material Handling — hoists and conveyor systems where controlled speed matters
· Heavy Industry — large industrial drives and elevators with high starting torque requirements
Customization Options
The YRKK series supports configuration based on actual site conditions:
· Voltage selection from six standard levels (3000 V–11000 V)
· Bearing brand specified as SKF, NSK, or FAG
· Dimensional adjustments based on installation constraints
· Transport options including sea freight, land, air, and multimodal logistics
· Motor brand, series, and model recommendations based on your load profile
If your project has specific requirements not listed here, Contact Us with your application parameters and we will identify the appropriate configuration.
Certifications
The YRKK series holds the following certifications, covering electrical safety, energy efficiency, and environmental management:
CCC · CE · ISO9001:2000 · CRCC (Ministry of Railways) · CQC · UL · GOST · China Energy Saving Certification · ZDHY Environmental Management System Certification
These provide documented compliance evidence for project approvals, procurement audits, and cross-border shipments.
Why Work With XCMOTOR?
· 20+ years supplying industrial power equipment
· Sourcing partnerships with 30+ motor manufacturers including ABB and Siemens
· Products certified under 10+ domestic and international standards
· Starting current reduced to 2.5–3× rated value — reducing grid stress at startup
· Annual maintenance cost reported at 6–9% of equipment purchase price
· Externally accessible slip rings and brushes simplify routine servicing
· Technical support available 7 days a week
FAQ
Q: What is the main difference between a wound rotor motor and a squirrel-cage motor?
A: A wound rotor motor has rotor windings connected to external resistors via slip rings, enabling controlled starting current (2.5–3× rated) and high starting torque (1.8–2.2× rated). Squirrel-cage motors draw 6–8× rated current at startup and provide no external control over rotor circuit resistance.
Q: Which industries are YRKK wound rotor motors best suited for?
A: Mining, metallurgy, steel rolling, wire drawing, and heavy material handling — applications where frequent heavy-load starts and controlled acceleration are required.
Q: Can the YRKK motor start under full load?
A: Yes. Starting torque of 1.8–2.2× rated torque allows the motor to start fully loaded equipment such as ball mills, crushers, and hoists without additional voltage-reduction devices.
Q: What bearing brands are available?
A: SKF, NSK, and FAG bearings can be fitted based on your site inventory or maintenance preferences.
Q: How is routine maintenance handled?
A: Slip rings and brushes are externally accessible. Routine checks involve inspecting brush wear and removing carbon dust. Annual maintenance cost is reported at 6–9% of the equipment purchase price.
Q: What certifications does the YRKK series carry?
A: CCC, CE, ISO9001:2000, CRCC, CQC, UL, GOST, China Energy Saving Certification, and ZDHY Environmental Management System Certification.
Contact Us
Send your Wound Rotor Induction Motors project requirements or technical questions to XCMOTORs@163.com">xcmotors@163.com.
