Selecting And Dimensioning Induction Motors; Clarification Of The Type Of Drive; Defining The Supplementary Conditions And Integration Into An Automation System - Siemens SINAMICS S120 Configuration Manual

2.3

Selecting and dimensioning induction motors

2.3.1

Clarification of the type of drive

The motor is selected on the basis of the required torque, which is defined by the application,
e.g. traveling drives, hoisting drives, test stands, centrifuges, paper and rolling mill drives,
feed drives or main spindle drives. Gearboxes to convert motion or to adapt 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 application, the following mechanical
data is among those required to calculate the torque to be provided by the motor:
● Masses to be moved
● Diameter of the drive wheel
● Leadscrew pitch, gear ratios
● Frictional resistance
● Mechanical efficiency
● Traversing paths
● Maximum velocity
● Maximum acceleration and maximum deceleration
● Cycle time
2.3.2

Defining the supplementary conditions and integration into an automation system

You must decide whether synchronous or induction motors are to be used.
Synchronous motors are the best choice if it is important to have low envelope dimensions,
low rotor moment of inertia and therefore maximum dynamic response ("Servo" control type).
Induction motors can be used to increase maximum speeds in the field weakening range.
Induction motors for higher power ratings are also available.
The following factors are especially important when engineering a drive application:
● The line system configuration, when using specific types of motor and/or line filters on IT
● The utilization of the motor in accordance with rated values for winding temperatures of
● The ambient temperatures and the installation altitude of the motors and drive
● Heat dissipation from the motors through natural ventilation, forced ventilation or water
Other supplementary conditions apply when integrating the drives into an automation
environment such as SIMATIC or SIMOTION.
1PH4 Induction Motors
Configuration Manual, (APH4S), 08/2008, 6SN1197-0AD64-0BP1
systems (non-grounded systems)
60 K or 100 K.
components.
cooling
2.3 Selecting and dimensioning induction motors
Configuring
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