The high-voltage wound rotor motor, a bespoke high-voltage drive solution for heavy industry, belongs to the YR series of wound rotor high-voltage three-phase asynchronous motors. Its core competitive advantage lies in the 'wound rotor + slip ring' configuration. Unlike the cast aluminium rotor closed-loop design of squirrel-cage motors, its rotor features windings formed from enameled wire. Terminals are led out via slip rings, permitting external connection to resistors or speed control devices. This fundamentally resolves three major pain points in high-voltage, high-power applications: 'start-up electrical surges, difficulty in heavy-load starting, and inability to withstand impact loads.'

This series fully complies with IEC international standards and domestic high-voltage motor specifications, covering power ratings from 220kW to 2500kW (with the 900kW model being the industrial standard workhorse). Frame sizes range from 355mm to 630mm, compatible with 3kV/6kV/10kV industrial high-voltage systems (customisable for overseas specifications such as North American 13.8kV or European 11kV). Standard protection rating is IP23 (upgradable to IP55 for dusty environments). The main cooling method is IC611 forced ventilation. It's designed for continuous operation (S1 mode). It acts as the main power source for heavy-duty equipment-like those in mining, metallurgy, power generation, and chemical industries.

I.Key Point

1. Stable heavy-load starting, eliminating concerns for grid equipment

By connecting series resistors or frequency-sensitive resistors to the rotor, starting current is controlled within 2.5–3.5 times the rated current (compared to 5–7 times for conventional squirrel-cage high-voltage motors). Unlike traditional motors that 'depress the entire grid voltage' during start-up, high-voltage wound rotor motor eliminates the need for enterprises to incur additional costs for grid capacity expansion or reactive power compensation devices. Simultaneously delivering 1.8–2.5 times rated torque, it ensures smooth operation even for mining hoists and crushers. This eliminates impact on transmission components like gears and couplings, extending the entire equipment's service life.

Taking the 900kW model as an example, when driving a mining jaw crusher, the starting torque reaches 2260N・m with a current of only 108A. This represents nearly 40% lower starting current than cage motors of equivalent power, while grid fluctuations are controlled within ±3%.

2. Shock & Overload Resistant, Built for Harsh Conditions

It's shock and overload resistant-perfect for harsh working conditions. The stator windings use vacuum pressure impregnation (VPI) technology, so the insulation layer is dense. It can stand up to 3kV/6kV high-voltage breakdown and resist aging even at high temperatures (up to 155℃). The slip rings are made of copper alloy with a sealed dust-proof design. Compared to standard slip rings, they cut carbon brush wear by 50%. Even in dusty mine workshops, contact failures rarely happen.

The bearing system is built for heavy loads. It can handle 1.2 times the rated load for 1 hour. It also stands up to cyclic shock loads-like those from frequent starts/stops of metallurgical mills or steel ball impacts in mine ball mills. Even with 20% instant load fluctuations, the speed stays stable. That means uninterrupted production for you.

3. Easy Installation & Maintenance, Hassle-Free Replacement

It's easy to install and maintain, with replacement that's hassle-free. Frame dimensions, shaft extension details, and foot hole positions fully comply with IEC standards. Take 355mm frame motors: they come with a standard 80mm shaft diameter. That means this high-voltage wound rotor motor can replace same-size domestic or international wound rotor motors seamlessly. Replacing old motors requires no concrete foundation modifications or equipment adjustments-installation is completed in 8 hours, down from the traditional 3 days.

Routine maintenance is straightforward: inspect slip rings and carbon brushes weekly (carbon brushes last 6 months), wipe slip ring surfaces clean, and replenish bearing grease every 3 months (twice as long as comparable motors). No specialized high-voltage technicians are needed-ordinary electricians can handle upkeep.

II. Core Assurance

1. Quality

Core materials meet top-tier standards:

The stator core employs high-quality silicon steel laminations sourced from China's top five steel mills (with iron losses 15% lower than standard grades).

The windings employ 100% copper wire, with insulating paper and enameled wire.

Every motor undergoes 6 rigorous tests before delivery:

High-voltage withstand test (10kV for 30 seconds, no breakdown).

Heavy-load startup test (simulated 1.5x load startup).

Slip ring contact test (carbon brush resistance measurement).

Vibration test (vibration ≤0.1mm).

Efficiency test (≥94.8% for 900kW models).

Noise test (no-load noise ≤106dB).

All test data is provided in a traceable report.

2. Shipping

The high-voltage wound rotor motor packed in ISPM 15-compliant plywood crates (to avoid customs delays). Inside the motor, 8mm steel brackets keep everything secure. The motor's interior is fixed with 8mm steel brackets-super sturdy. The slip ring gets extra protection: sealed in a dust-proof bag plus 3 layers of pearl cotton cushioning. We work with professional freight forwarders to provide various transport choices.

III. Operation & Maintenance: Secrets to Long Motor Life

1. Operating Limits: Never Exceed These Boundaries

Ambient temperature	-15℃ to 40℃ (derate 1% per ℃ above 40℃).
Altitude	≤1000m (enhanced insulation required for higher altitudes).
Voltage fluctuation	±5% (e.g., 5.7kV-6.3kV for 6kV motors).
Avoid corrosive gases (e.g., chlorine, hydrogen sulfide) unless customized with anti-corrosion coatings.

Maintenance Checklist: Focus on Slip Rings & Bearings

Weekly	Clean slip ring dust; replace carbon brushes when worn to ≤20mm.
Monthly	Replenish bearings with NLGI 2-grade lithium-based grease (fill 1/3 of bearing space).
Quarterly	Conduct insulation resistance test (≥1MΩ is qualified).
Long-term storage (>6 months)	Run for 30 minutes monthly to prevent winding moisture.

IV. After-Sales Support: Dedicated Protection for Heavy-Duty Equipment

Warranty: 1-year full machine warranty (except wires). Repair/replacement for non-human damage.

Technical Support: Technical Support: If you have any issues, please call the support hotline. Engineers can provide video guidance. On-site service is also available.

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High Voltage Wound Rotor Motor

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