ac wound rotor motor

AC Wound Rotor Motor (YR Series) — Slip Ring Motor for Heavy Industrial Drives

AC wound rotor motor solutions from Shaanxi Qihe Xicheng Electromechanical Equipment Co., Ltd. are built for industrial environments where standard squirrel cage motors struggle with high-inertia loads. The YR Series covers 55–355 kW at 380V±5%, with IP23 and IP54 protection levels. We source directly from manufacturers including ABB, Siemens, Wolong, XEMC, SIMO, and CHANGSHA, and manage procurement, technical consultation, logistics, and after-sales support as a single point of contact.

What Is a Wound Rotor Motor and Why It Matters

A wound rotor induction motor connects its rotor windings to external resistors through slip rings. During start-up, these resistors limit inrush current and allow controlled torque build-up — a capability that squirrel cage designs cannot replicate. For equipment like hoists, crushers, ball mills, and loaded conveyors, this means smoother acceleration and less mechanical stress on both the motor and the driven load.

The YR Series is designed specifically for applications involving frequent starts, variable loads, or difficult start-up conditions where controlled speed and torque characteristics are required.

Technical Specifications

The rotor winding connects to external slip rings, allowing resistance insertion during start-up. This reduces inrush current and provides smooth, controlled acceleration suited to conveyor systems, pumps, and machine tools.

Common Sourcing Challenges and How We Address Them

Production Process

Each YR Series motor follows a defined manufacturing sequence before shipment:

1. Stator winding — coils wound and insulated to IEC-grade specifications

2. Rotor assembly — wound rotor with slip rings machined to tight geometric tolerances

3. Impregnation — vacuum pressure impregnation for moisture and vibration resistance

4. Dynamic balancing — rotor assembly balanced to reduce bearing wear and vibration

5. Final testing — no-load, locked-rotor, and insulation resistance tests conducted before shipment

Bearings from SKF, NSK, or FAG are selected and installed based on the application requirements you specify.

Industry Applications

The YR Series ac wound rotor motor is used across a range of heavy industries:

· Coal mines — driving ventilation fans and hoisting equipment under harsh conditions

· Machinery manufacturing — powering cutting machine tools and industrial presses

· Power plants — driving auxiliary equipment with demanding start-up cycles

· Water treatment — driving high-capacity pumps with smooth start-up control

· Cement and mining — running crushers and ball mills with high starting torque demand

· Conveyor systems — providing controlled acceleration for loaded belt conveyors

Customization Options

Standard catalog motors do not always fit site-specific installations. We offer:

· Dimensional adjustments — frame size and shaft dimensions modified to match your installation

· Bearing brand selection — SKF, NSK, or FAG based on load and speed requirements

· Protection level — IP23 for indoor ventilated spaces or IP54 for dusty and wet environments

· Voltage adaptation — configured within the 380V±5% range or adjusted per project requirement

· Logistics planning — sea, land, air, or multimodal transport arranged based on destination and timeline

Motor brand, series, and model recommendations are based on your actual technical requirements rather than generic catalog selections.

Certifications

All power levels and installation dimensions comply with IEC standards. Products pass insulation resistance, no-load, and performance tests before delivery.

Why Work With Us?

· Over 20 years of industrial power equipment supply experience

· Direct sourcing partnerships with ABB, Siemens, Wolong, XEMC, SIMO, CHANGSHA, and 25+ additional brands

· Full certification coverage including CCC, CE, ISO9001, CRCC, UL, and GOST

· Technical support available every day of the week, including weekends

· Customized dimensional adjustments and bearing selection per project

· Flexible logistics covering sea, air, land, and combined transport options

FAQ

Q: What is the power range of the YR Series?

A: The YR Series covers 55 kW to 355 kW, operating at 380V±5%, with IP23 and IP54 protection options.

Q: How does a wound rotor motor improve starting performance?

A: External resistance connected through the slip rings limits inrush current and allows controlled torque build-up during start-up — particularly useful for heavy loads such as crushers and hoists.

Q: Which bearing brands are available?

A: SKF, NSK, and FAG bearings can be installed based on your load profile and speed requirements.

Q: Can motor dimensions be adjusted for my installation?

A: Yes. Frame size, shaft dimensions, and mounting configurations can be modified to fit specific site requirements.

Q: What certifications are included?

A: Motors are certified under CCC, CE, ISO9001, CRCC, CQC, UL, GOST, and China Energy Saving standards.

Q: Which industries typically use the YR Series?

A: The YR Series is used in coal mines, power plants, water treatment facilities, cement production, conveyor systems, and machinery manufacturing — wherever controlled starting torque and reliable continuous operation are priorities.

Contact Us

Have a specific requirement or need a motor recommendation with ac wound rotor motor? Send your inquiry to XCMOTORs@163.com">xcmotors@163.com and our team will respond as soon as possible.