Siemens S120 ユーザーズマニュアル
Configuring the motor
5.1 Procedure
Recalculating the duty cycle
If the moment of inertia initially assumed deviates significantly from the actual moment of
inertia, the duty cycle may have to be recalculated.
5.1.10
Selecting the drive system components for the power connection
The drive system components for the power connection are selected on the basis of the
peak and continuous currents that occur in the duty cycle. If more than one motor is
operated in parallel on a single power unit, the total values of the peak and continuous
currents must be taken into account.
Note
In systems where direct drives are used on controlled infeeds, electrical oscillations can
In systems where direct drives are used on controlled infeeds, electrical oscillations can
occur with respect to ground potential. These oscillations are, among other things, influenced
by:
The lengths of the cables
The rating of the infeed/regenerative feedback module
The number of axes
The size of the motor
The winding design of the motor
The type of line supply
The place of installation
The oscillations lead to increased voltage loads and may damage the main insulation! We
thus recommend using an HFD commutating reactor with damping resistance for damping
the oscillations. For specific details, refer to the documentation of the drive system being
used or contact your local Siemens office.
5.1.11
Calculating the required infeed power
Infeed power
The electrical infeed power of the motors can be determined from the mechanical power
delivered and the resulting electrical losses.
,
With
,
Here, M represents the motor torque in Nm, ω represents the angular velocity in 1/s, and k
T
represents the torque constant of the motor in Nm/A (see also "Explanations of the formula
abbreviations)".
1FW6 Built-in torque motors
70
Configuration Manual, 05/2009, 6SN1197-0AE00-0BP3