SIEMENS
1/2
Siemens D 83.1 · 2016
1
Introduction
LOHER motors
Customized and industry-specific drive solutions in the process industry
■
Overview
With the LOHER CHEMSTAR, LOHER VARIO and SIMOTICS XP
motor series, Siemens has a range of drive solutions that are
specifically tailored to customized or industry-specific
requirements.
Building on well-proven standard platforms, the motors and
converters are adapted to a specific project with considerable
versatility in terms of mechanical and electrical design, as well
as special monitoring systems and cooling methods. Totally
individual drive systems are generated as a consequence which
are tailor made for the respective plant, application or customer
specification, thus enabling even highly sophisticated drives to
be achieved over the complete power range.
Motors in all applicable types of protection –
from 0.1 kW through to the megawatt range
LOHER CHEMSTAR and LOHER VARIO motors are available
depending on their classification from 0.1 to around 3000 kW in
all applicable types of protection. The motors ensure reliable
operation even in explosive atmospheres and provide maximum
safety for persons, machines and the environment.
The motors are available with the following types of protection:
•
Dust explosion protection in hazardous zones 21 and 22
• "Non-sparking"
Ex nA
for Zone 2
•
"Pressurized enclosure"
Ex p
for Zone 1
•
"Increased safety"
Ex e
for Zone 1
•
"Explosion-proof enclosure"
Ex d
for Zone 1
The portfolio comprises motors of Group II (EU Directive
2014/34/EU) for use in environments containing explosive gases
in the chemical, petrochemical and oil and gas industries, as
well as motors of Group I for firedamp protection in mining.
The motors are ATEX certified and also have country-specific
certificates such as EAC (Eurasian Customs Union), CCOE
(India) and NEPSI (China). The range of explosion-proof
low-voltage motors has been expanded with motors of the
SIMOTICS XP series. It represents the future standard product
series. The SIMOTICS XP motors are available in the type of
protection "Explosion-proof enclosure"
Ex d
for a power range
from 0.25 to 500 kW and supplement the LOHER CHEMSTAR
series. In comparison to the LOHER CHEMSTAR series, the
smaller range of products and fixed product characteristics
ensure significantly shorter delivery times and a considerably
easier ordering process.
Double protection for maximum safety
LOHER CHEMSTAR and LOHER VARIO motors can also be
used for drive solutions with double protection. This involves,
on the one hand, a combination of gas and dust explosion
protection for locations in which both fine dust and explosive
gases can occur, e.g. in the process industry or in mining.
On the other hand, this can be the double protection of the
Ex d and Ex e types of protection. This double protection is,
for example, appropriate onboard liquid gas tankers whereby
electrical equipment must be totally excluded as a possible
ignition source due to the hazardous load. For this purpose, the
explosion-proof motors are mechanically designed with the type
of protection "Explosion-proof enclosure.” At the same time, the
temperatures of the active parts correspond to the “increased
safety" type of protection.
Further products
This catalog contains explosion-proof motors in fin-cooled
designs. In the case of high powers up to 13.5 MW, tube-cooled
motors are available (normally in the type of protection “explo-
sion-proof enclosure" Ex d) as well as LOHER VARIO PLUS
motors with built-on heat exchangers (air-to-air or air-to-water).
The normal types of protection here are “non-sparking" Ex n and
“pressurized enclosure" Ex p. Specially designed motors are
also available in the larger frame sizes for converter operation.
They are characterized by subcritical operation, i.e. the critical
bending speed is higher than the rated speed. The full control
range can be utilized. The motors are designed with sleeve
bearings or roller bearings in accordance with their power rating
and number of poles.
© Siemens AG 2016