1-6
manufacturer). Over such an operating condition, the over-temperature of the motor may
easily occur. 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, 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 over-load capability for each Hybrid servo drive in the product
specification chart
If the holding pressure is at the maximum pressure of 17.5 Mpa, and a pump of
32cc/rev is used, the required motor current is approximately 34A
For such a current value, the following models can be chosen
VFD075VL43A-J, the overload may occur within 20 sec.
VFD110VL43A-J, 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 value 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.
1-3-2 Selection of Pump for Hybrid Servo Motor
Select a pump with a suitable displacement based on the required flow rate and motor speed;
If low noise is required, you can choose the screw pump or internal gear type.If a high
volumetric efficiency is required, you can choose the piston pump or dual displacement
piston pump.
Comparison of Commonly Used Pump (This may vary for different pump manufacturers).
Type of Oil Pump
Volumetric
Efficiency
Flow Pulsation Rotation Speed Noise
Internal Gear Pump Low Medium Medium Low
Piston Pump High Low Low High
Screw Pump Medium High High Medium
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