NORD Drivesystems B1000 - Manual (Page 696)

www.nord.com G694
Engineering Information
Standard Design & Construction
MOTORS
G1000 – Subject to Change Without Notice
Voltage and Frequency
NORD motors are available in a wide range of
voltages and frequencies for use in North America
and around the world. For a more detailed list of
choices see page 697.
NORD motors designed for North American voltages
(230V, 460V, 208V and 575V) conform to the voltage
and frequency tolerances in NEMA MG-1. The voltage
tolerance is +/-10%, the frequency tolerance is +/- 5%
or a combined voltage and frequency tolerance of
+/-10%.
Low Inertia
The motor inertia in all NORD motors is extremely low
which allows for a much more dynamic motor control
capability. Low motor inertia is a signifi cant ad-
vantage when using NORD motors with inverters
or vector controllers. NORD motors can cycle more
frequently and require less mechanical energy to
start than standard NEMA frame motors. This leaves
more energy to start the load.
High Torque
The NORD motors produce higher starting torque
than required by NEMA standards. This is achieved
through improved motor winding, rotor design and
construction.
Non-Sparking Fan
The standard NORD motor fan is a non-sparking de-
sign. The fan will also provide proper airfl ow in ei-
ther direction of rotation.
Terminal Block
Each NORD motor uses a terminal block, which is
a superior method of wire termination when com-
pared to pigtail leads. A terminal block ensures
long-term reliability of the power connections.
Tropical Protection (Anti-fungal)
As standard the NORD motor insulation system is
tropically protected. The insulating and construc-
tion components are inorganic materials so they re-
sist fungal growth.
Insulation Class
NORD motors are constructed with a thermal class F
insulating system. The motors are also designed for
a class B temperature rise (80°C). The use of class F
insulation with a class B temperature rise provides
increased operating life. Motors constructed with
class H insulation are also available as an option.
Insulation System
NORD motor insulation system is designed to pro-
vide a superior degree of protection. NORD utilizes
the following insulation components:
• Magnet wire – double coated insulation
• Varnish dip impregnation
• Slot liners
• Phase paper
• Phase separators
• Top sticks
• Connecting wire sleeves
Other motor manufacturers eliminate some of these
insulating components for cost reduction.
Inverter/Vector Duty – Voltage Spikes
All NORD motors are constructed with an insulating
system designed to withstand the repeated voltage
spikes generated by modern frequency inverters.
The insulation system withstands the ratings in
conformance with NEMA MG 1-2006 Section 31.4.4.2
Voltage Spikes.
Vpeak = 3.1 × Vrated with a Rise time ≤ 0.1μs.