Basic Information
| Parameter | Specification | Parameter | Specification |
|---|
| Model No. | NMK400L4A | Series | NMK Series |
| Rated Power | Up to 10,000 kW | Number of Poles | 4P–16P |
| Stator | Three-Phase | Rotor Structure | Winding Type (Slip-Ring) |
| Frequency | 50 Hz / 60 Hz | Voltage | 3 kV / 6 kV / 10 kV / 13.8 kV |
| Frame Size | 400–710 mm | Cooling Method | IC611 / IC81W |
| Mounting Arrangement | IMB3 / IMV1 | Rotation Direction | CW / CCW |
| Duty Type | S1 (Continuous) | Insulation Class | F |
| Temperature Rise | Class B | Ambient Temperature | -20°C to +50°C |
| Protection Rating | IP55 | Casing Type | Closed Type |
| Starting Mode | Direct-On-Line (DOL) | Installation Site | Indoor / Outdoor |
| Space Heater | Yes | Temperature Sensor | Yes |
| Certification | ISO 9001, CCC, CE | HS Code | 8501530090 |
| Origin | China | Production Capacity | 8,000 units |
| Transport Package | Standard Seaworthy Packing | | |
Product Description
NMK modular slip-ring motors are an 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.
NMK slip-ring motors minimize mechanical stress at starting, increasing the lifetime of driven equipment. They provide maximized availability and high torque over the entire speed range.
These motors are widely used in mills, crushers, fans, and conveyors in the mining, cement, and metal industries. They also offer a reliable solution for pumps in the water industry, as well as safe area pumps, compressors, and mixers in the petrochemical industry.
NMK slip-ring motors are available in shaft heights from 400 to 710 mm, with cooling methods and protection types of IC611/IP55 and IC81W/IP55 as standard. The motors are rated up to 10,000 kW.
NMK motors feature a welded steel frame. The slip ring unit can be supplied with permanent contact brushes or with brush lifting gear. In both cases, the slip rings are enclosed in a housing located at the N-end and separated from the main motor frame. A Liquid Resistance Starter (LRS) is available on request.
While this catalogue shows typical technical data for 6 kV and 11 kV at 50 Hz for 4, 6, and 8 pole motors, the complete product scope covers motors with 60 Hz, pole numbers up to 16, and voltage ratings up to 13.8 kV. For more detailed technical data and configuration solutions, please contact us.
Mounting Arrangements
Standard mounting arrangements for NMK motors:
- IMB3 (IM 1001): Horizontal foot-mounted
- Other mounting arrangements (e.g., IM1002) are available on request.
Enclosure and Cooling Options
Standard combinations for NMK motors are IC611/IP55 and IC81W/IP55. Other cooling methods such as IC616, IC86W, etc. are available on request.
IC611 / IP55 — Air-to-Air Heat Exchanger
This fully enclosed design incorporates an air-to-air heat exchanger mounted on the motor. Shaft-mounted fans are fitted both inside the motor frame and inside the slip ring housing, as well as outside the casing, to supply the internal and external cooling circuits respectively. The motor is protected against dust and splashing water from any direction.
IC81W / IP55 — Air-to-Water Heat Exchanger
This totally enclosed machine is fitted with machine-mounted and SRU housing-mounted air-to-water heat exchangers. A shaft-mounted fan is fitted inside the casing to supply the internal cooling circuit. The motor is protected against dust and splashing water from any direction.
Packaging
- Standard seaworthy package for export
- Plywood package or wooden fumigation-free package
- Suitable for long-distance transportation by sea or land
Warranty
Standard warranty: 12 months after commissioning, or 18 months after delivery, whichever comes first.
Extended warranty periods are available upon request — please contact us for details.
