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    7.5 kW Water Cooled CNC Spindle Motor, 24000 rpm, ER32

    5 out of 5 based on 3 reviews | Write a review
    Buy a reasonable price 7.5kW water cooled CNC spindle motor, 24000rpm, 2.98N·m torque and ER32 (φ3.175mm - φ20mm), frequency 400Hz, works at 3 phase 380V AC, matched with VFD supply for CNC router machines.
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    Delivery date: 6-12 days

    High quality 7500 watt three phase water cooled CNC spindle motor, works at 3 phase 380V AC 400Hz, 24000rpm, 2.98N·m torque with ER32 (φ3.175mm - φ20mm), suitable for CNC router machines.


    • Spindle motor with superior durability ER32 collet ensures smooth running.
    • Fast response, strong overload capacity, low noise and high mechanical precision.
    • High quality 4 pcs bearings (7007Cx2 + 7005Cx2), 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 STZ125-7.5z-ER32
    Matched VFD Model GK3000-4T00110G (15 hp three phase VFD)
    GK3000-CS00110G (15 hp 1-phase 220V to 3-phase 380V VFD)
    Power 7.5 kW
    Diameter φ125 mm
    Phase Three phase
    Speed 24000 rpm
    Voltage 3-phase 380V±10% AC
    Current 16A
    Frequency 400Hz
    Torque 2.96 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 ER32 (φ3.175 mm - φ20 mm)
    Bearings Type 7007C P4*2 & 7005C P4*2
    Application Woodworking & Plastic
    Weight 26.5 kg
    PDFDownload Attachments 7.5 kW Water Cooled Spindle Motor CAD Drawings



    7500W Water Cooled CNC Spindle Motor Details

    Tips: Why use VFD for spindle motor?

    • A VFD can make the motor soft start, and the impact on mechanical equipment is small.
      The starting current of the VFD is smaller than that of the contactor, and the more frequent the working condition, the more energy-saving.
    • It can be infinitely variable, and it is easy to meet the work requirements of elevators and other requiring smooth speed.
    • Convenient for automatic control. The VFD has external control and local control, and can be selected at multiple speeds. With an encoder, the spindle motor can be accurately positioned, and the control is very portable.
    • The internal protection is perfect, and variable frequency drives are equipped with various fault protection functions. When the spindle motor or power supply fails, it will actively report the fault, and at the same time output the on-off signal through the relay contact, which is convenient to cut off the external control contactor and output the warning signal.

    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 last.

    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 7.5 kW Water Cooled CNC Spindle Motor, 24000 rpm, ER32
    Question for water or oil cooling spindle motor and VFD kit
    Our MTC Industries & Research company is looking for 7.5 Kwatt 50,000 rpm water or oil cooling spindle motor and VFD kit.
    We would appreciate your suggestion.
    From: Nancy | Date: 17/10/2023
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Unfortunately, we do Not provide a 7.5kW spindle motor at 50,000rpm, but a 7.5kW water-cooled spindle motor at 24,000rpm is available.

    There are two VFDs that match it (depending on your power supply parameters), please refer to the following:
    1. 15 hp (11 kW) VFD, 3 Phase VFD, SKU: GK3000-4T0110G
    2. 15 hp VFD, 1-Phase 220V to 3-Phase 380V, SKU: GK3000-CS0110G
    Value for money
    This is a very economical spindle with a water cooling function. It is quiet and runs at high speed and works very smoothly with the VFD I bought.
    From: Beyette | Date: 27/04/2022
    Was this review helpful? Yes No (0/0)
    Excellent spindle motor
    This high-quality 7.5kW water-cooled spindle motor works well with my VFD. It was so quiet that I almost forgot that I used it. 100% recommended!
    From: Vinod | Date: 27/04/2022
    Was this review helpful? Yes No (0/0)
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