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Rexroth Frequency Converter EFC x610
Series
Fig. 12-22: Wiring of the motor
If the parameters above cannot be acquired from the motor nameplate. These
parameters can be calculated according to the following steps or auto tuning.
Only for synchrounus motors MSK. For the new MS2N motors the data can be
find in the MS2N instruction manual.
1. Choose motor rated speed Nn as required.
2. Select "speed-torque" characteristic curve according to the actual working
conditions, and derive torque Mn at the rated speed.
3. Rated power is calculated by Pn = (Mn x Nn x 2π) / 60.
4. Acquire torque constant km-n and number of pole pairs o from Rexroth mo-
tor instruction.
5. Rated current is calculated by In = Mn / (Km-n).
6. Rated frequency is calculated by fn = o x Nn / 60.
7. The number of motor poles equals to 2 x o.
Take the motor MSK071C-0450-NN as an example. The required motor rated
speed is 1,500 rpm, motor works continuously and the housing temperature rise
must not exceed 60 ℃. The parameters are calculated as follows.
Functions and Parameters
R912005854_Edition 09 Bosch Rexroth AG
157/653
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