Rexroth IndraDrive Introducing the Products 1-15
DOK-INDRV*-FU*********-IB01-EN-P
• The cable parameters depending on cable design and length
(determine the properties of the transmission distance, such as the
attenuation).
• The motor design regarding capacitive and inductive properties (form
the end of the transmission distance).
As a result of the variables, the insulation system of the third-party motor,
as regards voltage, is loaded by the values
• peak voltage U
pp
and
• voltage change dv/dt.
The occurring peak voltages at the motor are caused by reflections in the
motor cable. The insulation of the motor is thereby loaded with other peak
voltages and voltage changes than the ones occurring at the output of the
power section.
Note: Determine the occurring voltage load at the terminals of the
third-party motor in the application with all involved
components.
Use voltage-reducing components (e.g. motor filter HMF), if one of the
following criteria applies:
• allowed voltage change (dv/dt) of third-party motor smaller than
5 kV/µs
• allowed peak voltage (crest value) of third-party motor between phase-
phase and phase-housing smaller than 1500 V
• motor cable length smaller than 25 m
• mains voltage greater than AC440V
Note: Apart from the nominal current I
N
, especially take the
maximum allowed switching frequency of the power output
stage (f
s
) into account with which the motor filter HMF may be
operated.
Verify the success of the voltage-reducing measure.
Minimum Inductance of Third-Party Motor
Depending on the controller used, the motor has to have a minimum
value for inductance. The actually available inductance of a motor can be
measured directly between two motor terminals by means of an
inductance measuring bridge. The measurement has to be made for a
complete motor wired for normal operation but not yet connected. During
the measurement one motor terminal remains open!
For asynchronous motors the measured value can only be used if the
rotor doesn't have closed slots!
Controller type Minimum required motor inductance
HCS with 3*AC230V
L
U-V
= 60* 4/(√2 * I
Typ
* f
s
)(in mH)
HMS, HMD at HMV (3*AC400V)
HMS, HMD at HCS (3*AC400V)
L
U-V
= 80* 4/(√2 * I
Typ
* f
s
)(in mH)
HMS, HMD at HMV (3*AC480V)
HMS, HMD at HCS (3*AC480V)
L
U-V
= 116* 4/( √ I
Typ
* f
s
) (in mH)
I
Typ
: maximum controller current acc. to type code (rms value)
f
s
: desired switching frequency in kHz
Fig. 1-12: Minimum inductances depending on controller data, supply units and
supply voltage
Use of Voltage-Reducing
Components, Motor Filter HMF
(64 paginas)
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