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        中文 / ENGLISH

        Your position: Home > Product > Electro-hydraulic servo system

        Suzhou Wohe Fluid Control System Co., Ltd.

        Address: No 32, Muxu East Road, Mudu Town, Wuzhong District

        TEL:0512-66578402、13338660122

        FAX:66578242   QQ:417168484

        E-mail:panyoupu@163.com

        Electro-hydraulic servo system

        產品名稱:

        Servo system selection guide and manual

        所屬類別:Electro-hydraulic servo system
        發布時間:2018-10-23 10:57:42
        點擊量:
        分享:
        Detail:

        product manual:

        Electro-hydraulic servo system selection guide:

         

        1, servo oil pump recommended

        The oil pump is selected according to the displacement, flow rate and maximum speed of the pump and motor required by the hydraulic system.

        Hydraulic presses, die casting machines Common oil pumps are compared as follows (different brands of oil pumps will be different):

         

         

        Piston pumpVane pump

        Oil pump type

        Volumetric efficiency

        Flow pulsation

        Rotating speed

        Recommended speed(rpm):

        noise

        Internal gear pump

        low

               in

        in

        2000~2600

          in

        high

        high

        low

        1500~2200

        high


        in

        low

        high

        2000~3200

        low


         

        2, servo motor selection


        Select the torque of the servo motor based on the pump displacement and system pressure.


        (1) Calculate the maximum torque of the motor according to the hydraulic principle:


        Tmax=0.0159×P×q(Nm)


        P: maximum pressure (kgf/cm2), q: oil pump displacement (cc/r)


        (2) Determine the rated torque of the motor:


        According to engineering experience, the overload capacity of the motor is 1.3 to 1.8 times. When the working condition period is short and the frequency is higher, the overload capacity is 1.3 times. The rated torque of the motor is:


        Tm=Tmax/1.3~1.8


        (3) Calculation example:


        Assuming the oil pump is 50cc/r and the maximum pressure is 175kgf/cm2, the rated torque of the motor is:


        Tm=0.0159×50×175/1.8=77.3(Nm)


         


        3, servo drive selection


        (1) Determine the rated current of the servo drive:


        Ie =Tm/Kt/η


        Tm: rated motor torque (Nm), Kt: motor torque constant (Nm/A), η: motor efficiency (%)


        (2) Servo drive holding current:


        Ib=Ie×1.5


        Ie: drive rated current (A)


        (3) Calculation example:


        Assume that the oil pump displacement is 50cc/r, the system pressure is 175kgf/cm2, Kt is 2.8, and the motor efficiency is 92%.


        Tm=0.0159×50×175/1.8=77.3Nm


        Ie=77.3/2.8/0.92=30A


        Ib=30×1.5=45A


        The EM500T035C can be selected with a rated current of 32A, a holding current of 45A and a maximum current of 58A.



        Suzhou Wohe Fluid Control System Co., Ltd. TEL:0512-66578402,13338660122 E-mail:panyoupu@163.com  QQ:417168484 ICP13011250號-1

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