SIEMENS
13/28
Siemens D 21.4 · 2017
Tools and configuration
Configuration notes
Motors
13
■
Configuration
Motor selection
The motor is selected on the basis of the required torque, which
is defined by the application, e.g. drives for gantries, hoists, test
stands, centrifuges, paper and rolling mill drives, feed drives
and main spindle drives. Gear units for movement conversion
or for adapting the motor speed and motor torque to the load
conditions must also be considered.
As well as the load torque which is determined by the applica-
tion, the following mechanical data are among those required
to calculate the torque to be provided by the motor:
•
Masses to be moved
•
Diameter of the drive wheel/diameter
•
Leadscrew pitch, gear ratios
•
Frictional resistance data
•
Mechanical efficiency
•
Traversing paths
•
Maximum velocity
•
Maximum acceleration and maximum deceleration
•
Cycle time
You must decide whether synchronous, induction or our
especially energy-efficient synchronous-reluctance motors
are to be used.
Synchronous motors should be selected for compact con-
struction volume, low rotor moment of inertia and therefore
maximum dynamic response.
Asynchronous motors (induction motors) can be used to in-
crease maximum speeds in the field-weakening range. Asyn-
chronous motors (induction motors) for higher powers are also
available.
The following factors are of prime importance during
configuration:
•
The line supply configuration when using specific types of
motor and/or line filters on IT systems (non-grounded
systems)
•
The ambient temperatures and the installation altitude of
the motors and drive components
The motor-specific limiting characteristics provide the basis
for defining the motors.
These define the torque or power characteristic with respect to
speed and take into account the motor limits based on the DC
link voltage of the Power Module or Motor Module. The DC link
voltage in turn is dependent on the line voltage and, with
multi-motor drives, on the type of Line Module.
Typical speed/power graph for asynchronous (induction) motors
Torque characteristics of synchronous motors
For detail engineering information, please refer to the motor
configuration manuals.
An updated overview of configuration manuals is available in a
number of languages on the Internet at:
The SIZER for Siemens Drives engineering tool is available to
assist you with configuring.
n
2
P
max
S
1
n
max
n
P
Voltage limiting characteristic
Constant
power
range
(field weakening range)
n
rated
P
rated
G_PM21_EN_00074a
Constant
torque
range
G_D211_EN_00271
n
max mech
n
n
max Inv
M
max
M
max Inv
without field
weakening
Field
weakening
operation
M
Voltage limiting characteristic
without field weakening
Voltage limiting characteristic
with field weakening
S3-25 %
S3-40 %
S3-100 %
S1 (100 K)
S1 (60 K)
© Siemens AG 2017