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    4.5kW Air Cooled CNC Spindle Motor, 18000rpm, 2.27Nm

    5 out of 5 based on 1 reviews | Write a review
    Hot sale 4.5kW air cooled spindle motor for CNC router with high speed of 18000rpm, ER32 collet, 2.27Nm holding torque, works at 380V AC 300Hz, 4pcs P4 grade ceramic ball bearings which improves the service life under high speed revolution.
    Free Shipping Worldwide
    Delivery date: 6-12 days


    • Cooling: Air cooling, Power: 4.5kW, Torque: 2.27Nm, Collet: ER32
    • Voltage: 380V AC at 300Hz, cooled spindle motor speed: 1-18000 R/min
    • Fast response, strong overload capacity, low noise and high mechanical precision.
    • High quality 4pcs bearings (7008Cx2 + 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.
    • Tight sealing and two-layer dustproof design.


    This series air-cooled electric spindle motors are applicable to CNC engraving machines and used for high speed profiling, drilling, cutting, engraving and groove milling of wood, plastics, aluminum, rubber and other materials.

    4.5kW Air Cooled Spindle Motor Specification

    Model STF60-103-4.5
    Power 4.5kW
    Phase Three phase
    Speed 18000rpm
    Voltage 3-phase 380V±10% AC
    Current 9.1A
    Frequency 300Hz
    Torque 2.27Nm
    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 ER32 (φ3.175-φ20)
    Bearings Type 7008C P4*2 & 7002C P4*2
    Application Woodworking & Plastic
    Weight 12kg

    4.5kW Air Cooled Spindle Motor Dimension (Unit=mm)

    4.5kw spindle motor dimension


    Under normal processing conditions, the main parameter affecting tool life of woodworking engraving machine is spindle motor speed. Under the same conditions, the lower the spindle motor speed, the longer the tool life. In order to prolong the service life of the tool, it is desirable to set a lower spindle speed, but the speed of the spindle motor can not be reduced indefinitely. When the speed of the spindle motor is too low, the cutting force becomes larger at the same feed speed, which makes the tool unbearable. So there is a reasonable rotational speed range for spindle when processing certain materials.

    Cutting Organic Glass Plastic Cutting PVC









    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 4.5kW Air Cooled CNC Spindle Motor, 18000rpm, 2.27Nm
    Confirm something before buying
    1. Is your 4.5kW CNC spindle motor being on for long periods of time?
    2. 95% on time  for 8-10 hrs out of the day?
    3. Does air cooling require additional heat sink to keep it at safe temp?
    4. Is there a temp which should not be exceeded?
    From: Maksim Semeniuk | Date: 08/09/2020
    Was this review helpful? Yes No (0/0)
    ATO Responded
    1. Yes, no problem, it can be used for a long time,and the warranty is 12 months.
    2. No problem running 8 hours of a day.
    3. No other radiator needed.
    4. The temperature that should not be exceeded is 110 degrees.
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