Datasheet
QSH5718-10000-AT Hardware Manual • Hardware Version V1.00 | Document Revision V1.00 • 22.02.2019
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Percentage of rated cur-
rent
Percentage of motor
torque
Percentage of static mo-
tor power dissipation
Comment
150% ≤150% 225%
Limit operation to a few
seconds
125% 125% 156%
Operation possible for
a limited time
100% 100% 100%
= 2
∗ I
RMSRAT ED
∗
R
COIL
Normal operation
85% 85% 72% Normal operation
75% 75% 56% Normal operation
50% 50% 25%
Reduced microstep ex-
actness due to torque
reducing in the magni-
tude of detent torque
38% 38% 14% see above
25% 25% 6% see above
0% see detent torque 0%
Motor might lose posi-
tion if the application’s
friction is too low
Table 13: Motor current settings
6.2.1 Choosing the Optimum Current Setting
Generally, you choose the motor in order to give the desired performance at nominal current. For short
time operation, you might want to increase the motor current to get a higher torque than specified for the
motor. In a hot environment, you might want to work with a reduced motor current in order to reduce
motor self heating.
The TRINAMIC drivers allow setting the motor current for up to three conditions:
• Stand still (choose a low current)
• Nominal operation (nominal current)
•
High acceleration (if increased torque is required: You may choose a current above the nominal
setting, but be aware, that the mean power dissipation shall not exceed the motors nominal rating)
If you reach the velocity limit, it might be a good idea to reduce the motor current, in order to avoid
resonances occurring. Please refer to the information about choosing the driver voltage.
6.2.2 Choosing the Standby Current Setting
Most applications do not need much torque during motor stand-still. You should always reduce motor
current during stand still. This reduces power dissipation and heat generation. Depending on your
application, you typically at least can half power dissipation. There are several aspects why this is possible:
In standstill, motor torque is higher than at any other velocity. Thus, you do not need the full current even
with a static load! Your application might need no torque at all, but you might need to keep the exact
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