Product Highlights
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High Starting Torque: Ideal for heavy load inertia applications (e.g., mill drives) and weak network conditions.
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Wide Power Range: Rated power up to 10,000 kW with frame sizes from 400 to 710 mm.
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Flexible Customization: Customizable voltage (3–13.8 kV), frequency (50/60 Hz), and mounting arrangements.
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Robust Construction: Welded steel frame with IP55 protection against dust and splashing water.
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Extended Warranty: Standard 12–18 months warranty, with options to extend upon request.
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Versatile Applications: Suitable for mining, cement, metals, water treatment, and petrochemical industries.
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Advanced Cooling Options: Standard IC611/IP55 and IC81W/IP55; other methods available on request.
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Safety Features: Equipped with space heaters and temperature sensors for reliable operation.
Product Attributes
1. Product Description
Modular Slip-Ring Motors, Type NMK
NMK slip-ring motors are the ideal solution for applications requiring high starting torque and low starting current. They are especially suitable for heavy load inertia applications, such as mill drives, or situations where network conditions are weak.
By minimizing mechanical stress during startup, NMK motors increase the lifetime of your driven equipment while providing maximized availability and high torque over the entire speed range.
Key Features:
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Wide Application Scope: Widely used for mills, crushers, fans, and conveyors in the mining, cement, and metal industries. They also offer reliable solutions for pumps in the water industry and safe-area pumps, compressors, and mixers in the petrochemical sector.
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Design & Ratings: Available in shaft heights from 400 to 710 mm, with standard cooling methods of IC611/IP55 and IC81W/IP55. Motors are rated up to 10,000 kW.
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Robust Frame: Built with a welded steel frame. The slip ring unit can be supplied with permanent contact brushes or brush lifting gear. In both cases, the slip rings are enclosed in a housing at the N-end, separated from the main motor frame. A Liquid Resistance Starter (LRS) is available on request.
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Comprehensive Range: While typical catalog data shows 6 kV and 11 kV at 50 Hz for 4, 6, and 8-pole motors, the complete product scope covers 60 Hz, up to 16 poles, and voltage ratings up to 13.8 kV.
For detailed technical data and configuration solutions, please contact us.
2. Mounting Arrangements
Standard mounting arrangements for NMK motors include:
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Code I: IM B3
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Code II: IM 1001 (Horizontal foot mounted)
Other mountings, such as IM1002, are available upon request.
3. Enclosure and Cooling
Standard combinations for NMK motors are IC611/IP55 and IC81W/IP55. Other cooling methods (e.g., IC616, IC86W) are available on request.
IC611/IP55 (Air-to-Air Cooling):
This fully enclosed design features an air-to-air heat exchanger mounted on the motor. Shaft-mounted fans are fitted both inside the motor frame and slip ring housing, as well as outside the casing, to supply the internal and external cooling circuits. The motor is fully protected against dust and splashing water from any direction.
IC81W/IP55 (Air-to-Water Cooling):
This totally enclosed machine utilizes machine-mounted and SRU housing-mounted air-to-water heat exchangers. A shaft-mounted fan inside the casing supplies the internal cooling circuit, ensuring complete protection against dust and splashing water from any direction.
4. Packaging
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Standard Export Packaging: Seaworthy plywood or wooden fumigation package.
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Transport Ready: Suitable for long-distance transportation by sea or land.
5. Warranty Period
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Standard Warranty: 12 months after commissioning, or 18 months after delivery, whichever comes first.
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Extended Warranty: Available upon request. Please contact us for more details.
