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    1.5 kW Air Cooled CNC Spindle Motor, 18000 rpm, ER20

    5 out of 5 based on 2 reviews | Write a review
    1.5kW air-cooled spindle motor with 3 phase, high speed of 18000 rpm, 300Hz frequency, 0.91 Nm holding torque, offers high accuracy, stable performance and long service life. ER20 spindle motor designed for CNC engraving machine.
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    Delivery date: 6-12 days

    1500W CNC spindle motor for sale at affordable price, 18000 rpm speed, 0.91 Nm torque, 300Hz frequency, 3 phase 380V AC operating voltage, ER20 (φ3.175 mm - φ13 mm) collet.


    • Spindle motor with air cooling fan and ER20 collet ensures smooth running.
    • Fast response, strong overload capacity, low noise and high mechanical precision.
    • High quality 4 pcs bearings (7005Cx2 + 7002Cx2), 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 air-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 STF47-82-1.5
    Matched VFD Model GK3000-4T0022G (3 hp three phase VFD)
    GK3000-CS0022 (3 hp 1-phase 220V to 3-phase 380V VFD)
    Power 1.5 kW
    Phase Three phase
    Speed 18000 rpm
    Voltage 3-phase 380V±10% AC
    Current 3.2A
    Frequency 300Hz
    Torque 0.91 Nm
    Number of Pole 2 poles
    Cooling Type Air-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 - φ13mm)
    Bearings Type 7005C P4*2 & 7002C P4*2
    Application Woodworking & Plastic
    Weight 7 kg
    PDFDownload Attachments 1.5kW Air Cooled Spindle Motor CAD Drawings



    1500W Air Cooled CNC Spindle Motor 18000rpm Details

    6 Tips of Spindle Motor Maintenance

    1. Iron hook shall be commonly used to clean the leaking mouth at the lower end of the water drain cover at the front end of the spindle motor in use, so as to prevent debris from blocking the leaking pipe.

    2. The air into the spindle motor should be dry and clean.

    3. Remove the CNC spindle from the machine tool and use the air pipe to blow out the residual water in the motorized spindle cooling cavity.

    4. Long-term use of the spindle motor should be oil seal, start, in addition to the use of gasoline to wash the surface of anti-rust oil, should do the following work:

    A. Pass oil mist for 3-5 minutes. Turn the rotating shaft with your hands and feel no retardation.
    B. Use megohm meter to detect the insulation to the ground, usually ≥10 megohm.
    C. First run at 1/3 rated speed for 1 hour when the power is switched on. When there is no abnormal phenomenon, run at 1/2 rated speed for 1 hour
    D. Precision steel ball is adopted to maintain the turning accuracy of the spindle in high-speed grinding.

    5. The CNC spindle motor can be lubricated with high speed grease and oil mist according to different rotating speed.

    6. The temperature rise caused by the high-speed rotation of the spindle can be eliminated by using the coolant circulating system flow.

    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 1.5 kW Air Cooled CNC Spindle Motor, 18000 rpm, ER20
    Questions of spindle motor
    What is the height of the center of the spindle from the underside of the base? (60.5mm?) Warranty?  
    Would be nice if I could get a step file or solidworks model to incorporate into our design would make a decision and plan much easier.
    Do you know who made the drawing? The drawing appears to have been made off of a solid model, will you ask if they will send a step file?
    From: helen | Date: 19/07/2023
    Was this review helpful? Yes No (0/0)
    ATO Responded
    The height of the center of the spindle from underneath the base is 121÷2=60.5mm.
    The warranty period is one year.
    Unfortunately, we do not provide CAD drawings.
    Strong, well-constructed, high quality
    This is a very a strong, well-constructed, high quality spindle motor. I just installed it, and it runs smoothly and quietly! I would recommend to my mates and I also want to buy more.
    From: Ryan | Date: 06/04/2022
    Was this review helpful? Yes No (0/0)
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