Chapter 1. Description of Hybrid Servo Drives | VFD-VJ
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3. Rated Torque and Rated Power of the Motor
When holding pressure is under maximum pressure, the required torque cannot exceed
1.5 times of the motor’s rated torque (depending on the data provided by the motor’s
manufacturer) at most or the motor would be overheated. Let us take the factor 1.5 as an
example, if the rated torque of the motor is 77 N-m, the motor with a power of 12kW* and
a rated speed of 1500 rpm can be chosen.
*The power of the motor is calculated by using
)60/2()()(
rpmmNTWP
4. Maximum Current of the Motor
Example: Check the parameter kt (Torque/A) in the motor’s specifications fist. If kt = 3.37,
the maximum current is approximately 116/3.37 = 34A at the maximum torque
of 116 N-m.
5. Selection of Matched Hybrid Servo Drive
Example: Look up the heavy-duty capability for each hybrid servo drive in the product
specifications.
If the holding pressure is under the maximum pressure of 17.5 Mpa by using
with a pump of 32cc/rev, the required motor current would be approximately
1883A.
Under such a current value, overload may occur in different times due to
different models.
For model VFD450VL43C-JO, the overload may occur within 20 sec..
For model VFD550VL43C-JO, the overload may occur approximately after 60
sec..
NOTE
If there is no suitable motor that meets the specifications, a motor with a higher rated power
can be used instead.
For any information about the hybrid servo drives or any assistance in detailed configuration
of your company's products, please contact the manufacturer.
Before running the hybrid servo drive, verify if there’s enough cooling oil in the oil circulation.
You need to preheat the cooling medium such as cooling oil to prevent any condensation caused
by temperature differences.
Make sure that the cooling medium stay liquidized to keep the heat dissipating system stays
functional. So do follow the oil temperature limitation (10 ~ 50 ºC), (50 ºF ~ 122 ºF) to prevent
overheating on cooling oil.
Heat dissipating system: The maximum working pressure cannot go over 1.5 bar at the oil
inlet. Do not exchange the positions of oil inlet and oil outlet. Verify the specification of
connector’s pope thread (1/2” PT) to prevent damaging the pipe thread. Wrap pipe threads with
teflon tape (thread seal tape).
Use wall-mounting method and follow the space requirements during the installation
of the hybrid servo system
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