slip ring wound rotor motor

Slip Ring Wound Rotor Motor YR Series | High-Voltage Heavy-Duty Starting Solution

The YR Series slip ring wound rotor motor from Shaanxi Qihe Xicheng Electromechanical Equipment Co., Ltd. (XCMOTOR) is designed for high-voltage, heavy-load industrial applications where standard squirrel-cage motors struggle with startup demands. Covering a power range of 200–5,600 kW and voltage options from 3,000V to 11,000V, it delivers a starting torque of 1.8–2.2× rated torque while keeping inrush current to just 2.5–3× rated current — significantly below the 6–8× typical of squirrel-cage designs.

About XCMOTOR

Shaanxi Qihe Xicheng Electromechanical Equipment Co., Ltd. (XCMOTOR) has been supplying power equipment to industrial clients for over 20 years. The company works with more than 30 motor brands worldwide — including ABB, Siemens, Wolong, NEC, SIMO, XEMC, and CHANGSHA — to source and match motors to real end-user requirements, covering brand, series, model, and dimensional specifications.

Production is managed through a SAP factory management system, and every order is handled by a professional technical team from needs analysis through to delivery. Orders are supported 7 days a week, and XCMOTOR offers a 30-day open purchase return policy along with free delivery on qualifying orders.

Why Heavy-Load Industries Need a Different Starting Approach?

High-voltage squirrel-cage motors draw 6–8× rated current at startup, causing voltage dips, mechanical shock to drive components, and potential disruption to other equipment on the same grid. In applications such as ball mills, hoists, and rolling mills — where full-load starts are routine — this creates real operational and maintenance costs.

The YR Series addresses this through its wound rotor structure: rotor windings connect to external resistors via slip rings, allowing staged resistance adjustment during startup. This limits inrush current to 2.5–3× rated current and raises starting torque to 1.8–2.2× rated torque, enabling full-load cold starts without voltage-reduction starter equipment.

Technical Specifications

The slip ring assembly uses conductive metals such as brass or silver-plated alloys for the rotating rings. Brush contacts are made from copper graphite or silver graphite, maintaining stable electrical contact during continuous rotation. Bearings from SKF, NSK, or FAG can be specified based on your load and operating conditions.

Certifications

XCMOTOR's slip ring wound rotor motor products and quality system carry the following certifications:

· CCC and CE

· ISO 9001:2000 International Quality Management System

· CRCC (Ministry of Railways Certification)

· CQC Quality Management System Certification

· ZDHY Environmental Management System Certification

· China Energy Saving Production Certification

· UL and GOST

Production and Quality Process

Parts are sourced exclusively from verified brands with no substitutions, and production follows ISO 9001:2000 quality management standards throughout. The SAP factory management system tracks every stage, from initial needs analysis and model selection through dimensional adjustments, bearing specification, pre-shipment inspection, and packaging.

Industry Applications

The YR Series wound rotor induction motor is used across industries where repeated heavy-load starts at high voltage are a standard operating condition:

· Mining and Metallurgy — ball mills, crushers, and elevators requiring repeated full-load starts

· Steel and Metal Processing — rolling mills and wire drawing machines

· Material Handling — hoists and lifting equipment

· Industrial Drives — high-voltage applications requiring controlled torque during startup

Customization Options

XCMOTOR supports the following adjustments to match your specific installation and operating requirements:

· Voltage matched to your local grid (3,000V–11,000V)

· Power output from 200 kW to 5,600 kW

· Bearing brand: SKF, NSK, or FAG

· Rotor resistance configuration for specific speed-torque curves

· Custom dimensions for existing installation spaces

· Logistics options: sea freight, road transport, air freight, or combined multimodal transport

FAQ

Q: How does a wound rotor motor differ from a squirrel-cage motor at startup?

A: A wound rotor motor connects its rotor windings to external resistors through slip rings. Adjusting the resistance during startup controls the speed-torque characteristic, allowing smooth, low-current acceleration under full load — something a squirrel-cage motor cannot do without additional starting equipment.

Q: What is the starting current of the YR Series?

A: Starting current is limited to 2.5–3× rated current. Squirrel-cage high-voltage motors typically draw 6–8× rated current during startup, which can cause significant voltage drops and grid disturbances.

Q: Which industries are best suited for this motor?

A: Mining, metallurgy, steel processing, and heavy material handling — anywhere frequent heavy-load starts at high voltage are required, such as ball mills, hoists, and rolling mills.

Q: Can voltage and power be customized?

A: Yes. Voltage options run from 3,000V to 11,000V (±5%) and power from 200 kW to 5,600 kW. Dimensional adjustments are also available for special installation requirements.

Q: What bearing brands are available?

A: SKF, NSK, and FAG bearings can be specified depending on your load, speed, and environmental conditions.

Q: What certifications does the YR Series carry?

A: The motor and XCMOTOR's quality system hold CCC, CE, ISO 9001:2000, CRCC, CQC, ZDHY, China Energy Saving, UL, and GOST certifications.

Contact Us

Have a project in mind with slip ring wound rotor motor? Send your requirements to xcmotors@163.com — our team is available seven days a week and will respond promptly.