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    3.2 kW Water Cooled CNC Spindle Motor, 24000 rpm, ER20

    5 out of 5 based on 1 reviews | Write a review
    Best round water cooled spindle motor for sale, it features 3.2 kW power rating, 1.27 Nm holding torque and 24000 rpm high speed, P4 class for the spindle bearings, operates at 220V/380V AC 400Hz power system.
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    Delivery date: 6-12 days

    3.2 kW water cooled CNC spindle motor at low cost, 24000 rpm speed, 1.27 Nm torque, 400Hz frequency, 3 phase 220V/380V AC operating voltage, ER20 (φ3.175 mm - φ13 mm) collet.


    • Spindle motor with superior durability ER20 collet ensures smooth running.
    • Fast response, strong overload capacity, low noise and high mechanical precision.
    • High quality 3 pcs bearings (7005Cx2 + 7003Cx1), runout off less than 0.01mm, tapered bore less than 0.005mm.
    • P4 grade ceramic ball bearings used as spindle bearing, which improves the service life under high speed revolution.
    • Lubricated with grease, which is resistant to 200 degrees high temperature.
    • Tight sealing and two-layer dustproof design.


    This series water cooled electric spindle motors mainly match with variable frequency drives or engraving machines, CNC router machine, and used for high speed profiling, drilling, cutting, engraving and groove milling of wood, metal, plastics, foam, rubber and other materials.

    Note: The spindle motor and VFD shall be suitable with each other. The specifications and parameter settings of the VFD shall match the nominal parameters of the spindle motor. Otherwise, it will burn the spindle motor if the settings are not correct.


    Model STZ100-3.2-ER20
    Power 3.2 kW
    Diameter φ100 mm
    Phase Three phase
    Speed 24000 rpm
    Voltage 3-phase 380V±10% AC 3-phase 220V±10% AC
    Current 8A 12.8A
    Matched VFD Model GK3000-4T0055G (7.5 hp three phase VFD) GK3000-4T0055G (7.5 hp three phase VFD)
    Frequency 400Hz
    Torque 1.27 Nm
    Number of Pole 2 poles
    Cooling Type Water-cooled
    Installation Method Horizontally or Vertically (When the motor is installed, the radial runout standard is required to be within 5um, and the chuck is generally 10um-15um.)
    Lubrication Grease
    Thermal Class Class F
    Protection Class IP50
    Certification CE
    Warranty Bearings for half a year, other parts for one year
    Joint of Nose ER20 (φ3.175 mm - φ13 mm)
    Bearings Type 7005C P4*2 & 7003C P4*1
    Application Woodworking & Plastic
    Weight 8.5 kg
    PDFDownloa Attachments 3.2 kW Water Cooled Spindle Motor CAD Drawings



    3200W Water Cooled CNC Spindle Motor Details

    Tips: Water Cooling vs. Air Cooling of Spindle Motor

    When the high-speed motor spindle is working, the built-in motor and rolling bearing will generate a lot of heat during the rotation. Because the spindle has the characteristics of compact structure, small gap, and weak spontaneous heat dissipation effect, if the heat is not dissipated in time, it will cause different degrees of thermal expansion between internal parts, which will affect the performance parameters of the motor spindle rigidity and machining accuracy. It will seriously affect the service life of the spindle. For the overall cooling of the motor spindle, there are usually two ways of water cooling and air cooling.

    Water cooling refers to the design of cooling water circulation inside the high-speed spindle motor, and the corresponding cooling machine is equipped outside, so that the cooling liquid circulates inside the spindle to take away the internal heat. The advantages of this cooling method are simple and reliable in design, and the cooling effect is more obvious.

    Air cooling refers to the design of a forced convection channel between the housing of the high-speed spindle motor and the stator of the motor. The heat of the motor enters the forced convection area through heat conduction, and finally brings the heat into the air to realize the main shaft of the motor. Constant temperature work. Air cooling is non-polluting. If a static pressure gas bearing is used, the gas of the static pressure gas bearing can be used to circulate inside the spindle to take away part of the heat of the motor.

    Safety Tips for Using ATO CNC Spindle Motors

    1. The electric spindle motor and VFD shall be suitable with each other. The specifications and parameter settings of the VFD shall match the nominal parameters of the spindle motor, and it will burn the spindle motor if the settings are not correct.

    2. Before using water-cooled spindle motor, it shall ensure that cooling cycle system works normally and the running under no cooling conditions is prohibited. The volume of cooling water is calculated as per 1 liter/minute, the minimum flow of cooling water is not less than 5 liter/minute, cooling water pipe and the nozzle shall be connected reliably and there is no leakage.

    3. The cooling liquid shall be clean and free of grease and the temperature shall be within 5-30℃. The cooling medium shall carry out force cooling when the ambient temperature is higher than 30℃. The precision lathe requires the cooling liquid with a constant temperature of 20 +/-2℃.

    4. During storage and transport of the spindle motor, the status of high-speed grease inside the bearing will change. The user shall run it at a low speed first by starting from the lowest speed of the spindle motor for 30 minutes and then 20 minutes for every 3000 rounds. Otherwise there will have abnormal sound, noise, heat and other phenomena, which will affect the bearing life if the spindle motor is started directly at a high speed. During long term storage, the spindle motor shall run (at low speed) for 15-30 minutes once a week at least.

    5. Collet, nut and inner taper hole shall be washed clean when installing blades on the spindle motor in order to avoid any impact on the precision. The blade handle shall be inserted into the collet more than 15mm.

    6. For daily machining, the spindle motor shall be warmed up, run for 15-20 minutes when the machining speed is reached and then performs precise machining. It is better to stop the spindle motor for two hours every day in order to recover its mechanical fatigue and prolong its life time.

    7. No knocking the end cover of the spindle motor. No hammering the collet and blade head when removing blades. No shocking or colliding during transport, storage and using, especially the end of the spindle motor.

    8. The spindle motor shall run in designated direction.

    9. The spindle motor shall be installed and fixed according to the relevant drawings and instructions.

    10. The temperature shall be within 22-25℃ if water cooling machine is used.

    11. The spindle motor adopts vapor lock and the gas source shall not be used until it has passed oil-water separator and dry filter. The air pressure is 0.2-0.25Mpa and the filtering precision is 5μm, otherwise there will cause damages to the bearing.

    Existing reviews of 3.2 kW Water Cooled CNC Spindle Motor, 24000 rpm, ER20
    Great spindle motor at good price
    This water cooled spindle motor arrived on time. Well made spindle, installed without any problems. It has professional looking, very smooth and quiet operation. Matches perfectly to the one I am replacing.
    From: Lora Vance | Date: 03/12/2020
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