ABB's engineered motors for low voltage variable speed drives range of up to 2240 kW. Modular slip-ring motors, type NMK
Availability for heavy load inertia applications
Slip-ring motors are an ideal solution for applications which require high starting
torque and low starting current. They are especially suitable for heavy load inertia
applications like mill drives or situations where network conditions are weak.
ABB’s slip-ring motors minimize mechanical
stress at starting, increasing the lifetime of your
driven equipment. They provide maximized
availability and high torque over the entire
speed range.
Slip-ring motors are widely used in mills,
crushers, fans, and conveyors in the mining,
cement and metal industries. In addition, these
motors offer a reliable solution for pumps in
the water industry and 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,
IC81W/IP55 as standard. The motors are rated
up to 10,000 kW.
NMK motors have a welded steel frame. 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. Liquid resistance starter(LRS) is available
on request.
For NMK motors this catalog only shows the
typical technical data of 6kV and 11kV at 50 Hz
for 4, 6, and 8 pole motors. While the complete
product scope covers motors with 60Hz,
pole numbers up to 16, and voltage rating
up to 13.8kV.
For more detailed technical data and
configuration solutions on NMK slip-ring
motors, please contact ABB.
Standard combinations for NMK motors are IC611/IP55 and IC81W/IP55,
other cooling methods of IC616, IC86W, etc. available on request.
IC611/IP55
This design has an air-to-air heat
exchanger mounted on the motor,
which is fully enclosed. Shaft mounted
fans are fitted both inside motor
frame and inside slip ring housing,
and outside of the casing to supply
the inside and outside cooling circuits
respectively. The motor is protected
against dust and splashing water
from any direction.
IC81W/IP55
The machine is totally enclosed having
a machine-mounted and a 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.a component designed for
this purpose and mounted directly on
the rotor of the main motor, or by a fan
or pump unit mechanically driven by
the rotor or the main motor.
The type designation of the NMK motors follows the coding principle shown below.
Example: NMK 450L4A BALS
1 NM New Alternating Current Machines
2 K Indicates the type of motor, I = SCIM, K = WRIM
3 450 Shaft centre height in mm, 400, 450, 500, 560, 630, 710
4 L Frame length, S = small, M = medium, L = long
5 4 Number of poles
6 A Stands for the IC/IP combination;
A = IC611 / IC616 / IC666 / IP55 [TEAAC] air-to-air cooled
L = IC81W / IC86W / IP55 [TEWAC] air-to-water cooled
7 B Mounting arrangement, B = IM1001 (horizontal)
8 A Bearing type, A = antifriction, S = sleeve
9 L Indication of special construction (1 or more digits, not obligatory)
L = Brush lifting device (BLD) X = electrically special
T = separate ventilation Y = mechanically special
10 S Location of manufacture
S = Shanghai (China) H = Helsinki (Finland)
I = India (Vadodara)
ABB has been manufacturing high quality electric motors and generators for more than 100 years. Motors for hazardous areas represent one of its special
Life cycle services and support
From pre-purchase to migration and upgrades
ABB offers a complete portfolio of services to ensure trouble-free operation and
long product lifetimes. These services cover the entire life cycle. Local support is
provided through a global network of ABB service centers and certified partners.
Find out all of the information about the ABB Motors Drives and Power Electronics product: AC motor NMK. Contact a supplier or the parent company directly ...
Configuration: with slip ring, modular
Other characteristics: high-voltage
Type: induction
Number of poles: 4-pole, 8-pole, 12-pole, 6-pole
ABB's slip-ring modular motors are available as N-series general purpose motors (type NMK) and A-series engineered motors (types AMK and AML)
Your reliable partner
ABB motors are based on reliable designs, proven
in thousands of installations, and provide high
productivity in demanding conditions.
With ABB you always have a partner to discuss
different motor solutions to optimize your process.
Our services do not stop at sales. We make it easy
for you to reach us at every stage of your motor’s
life cycle.
ABB’s extensive global network ensures local service
delivery whenever and wherever you need it. The
worldwide network includes over 60 service centers
and more than 150 authorized service providers.
We offer predefined maintenance programs for all
lifetime phases of all ABB motors, and preventive
diagnosis and updates can help to further boost
your competitiveness when needed.
