SIEMENS
7/4
Siemens CR 1 · 2015
7
SIMOTICS motors for cranes
General technical specifications
■
Overview
Siemens has for many years been one of the leading manufac-
turers of crane motors. This type overview covers the current
range of three-phase motors for use in cranes.
The technical specifications for hoisting motors 1PH8 of shaft
height 355 (85 dB(A)), for gantry motors 1LP4, 1LP6 of shaft
height 132-280 with fitted brake and for the hoisting motors
1LG4, 1LG6 of shaft height 315 with external fan you can find
in this Catalog.
The technical specifications for the hoisting motors 1PH8 of
shaft height 80-280 can be found in Catalog PM21, Chapter 5
SIMOTICS main motors. For the technical specifications for hoi-
sting- and gantry motors 1LE1 of shaft height 100-315 and
1LG4, 1LG6 of shaft height 100-280 see Catalog D 81.1.
In addition to these motors, for high outputs in hoisting gear,
SIMOTICS FD motors (1LM1/1LQ1/1LL1/1LP1, Catalog D 81.8)
can be used as hoist motors in converter-fed drives.
The range of crane motors is aimed at crane manufacturers, sys-
tem integrators, and crane operators. To make it easier to select
motors, they are listed by speed and output (continuous and in-
termittent duty). The tables indicate the rated motor torques and
the maximum permissible torques.
The asynchronous motors with the DURIGNIT 2000 winding
insulation are suitable for use on the SINAMICS S120 drive sys-
tem. Since the hoist motors in particular operate in a large field
weakening range during converter operation, you must check –
alongside the usual design criteria such as thermal load (rms
torque) and maximum acceleration torque – whether the motor
can still generate the required maximum torque in the field wea-
kening range. A torque-speed diagram can be created to check
this.
The requirements of the motors vary depending on the applica-
tion conditions:
•
Gantry cranes that are used in production halls are not usually
directly subjected to climatic influences. The motors do not
necessarily need high degrees of protection or special paint.
•
Cranes located in seaports are often exposed to harsh wea-
ther, which means that special measures must be taken to pro-
tect the motors against corrosion as well as the ingress of dust
and water.
•
Cranes in steel works are often subject to very high ambient
temperatures. The electrical and mechanical design (e.g.
special bearings) must take this into account.
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Application
Siemens crane motors are particularly suitable for crane opera-
tions under difficult conditions. These robust motors
•
offer a high degree of protection and are particularly suitable
for harsh operating conditions
•
offer torque reserves that can handle high impulse loads
•
are specially optimized for high-inertia drives with high torque
Both SIMOTICS SD and SIMOTICS M motors are used in crane
applications.
SIMOTICS M are main motors which are used in crane applica-
tions primarily as hoist motors. With a power spectrum ranging
from 2.8 kW to 1340 kW, they cover virtually every application.
The compact asynchronous servo motors/main spindle motors
are perfectly adapted to the SINAMICS S120 drive system.
The compact SIMOTICS
SD asynchronous standard motors with
cast-iron housing are particularly rugged and are, therefore, the
first choice in crane applications.
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Configuration
Motor dimensioning
When motors for crane drives are dimensioned (high-inertia
drives), two criteria must be taken into account:
•
The required maximum torque (starting torque)
•
The rated output (thermal motor capacity)
When you check the torque, you check whether the motor can
generate the required maximum torque (e.g. for acceleration).
The maximum permissible torque is greater than the rated
torque and is often specified as a multiple of the rated torque. An
adequate safety margin from the stalling torque must be maintai-
ned.
When the output is dimensioned, the rated motor output is adjus-
ted in accordance with the effective power requirements of the
drive. The rated motor output depends on the motor temperature
which, in turn, is influenced by the operating mode and the ther-
mal behavior of the motor. The rating data of a motor differs for
the various operating modes in accordance with EN 60034-1.
The data is usually specified for one or more of the following ope-
rating modes:
•
Continuous duty S1 (also corresponds to intermittent duty
S3-100 %)
•
Short-time duty S2
•
Intermittent duty S3
Intermittent duties S4 and S5 vary to such an extent that accu-
rate data can only be provided when certain additional condi-
tions have been clearly defined.
The operating modes are defined in accordance with
EN 60034-1.
Symbols used in formulae:
P
Load/specified motor output
P
V
Power loss of the motor
ϑ
e
Final temperature, steady-state temperature
ϑ
max
Max. winding temperature in respective operating mode
ϑ
mean
Mean winding temperature
t
e
Operating time
t
P
Idle time
t
S
Duty cycle duration
T
L
Thermal time constant of the motor (running)
T
St
Thermal time constant of the motor (stationary)
© Siemens AG 2015