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    6kW Air Cooled Spindle Motor for CNC Router

    5 out of 5 based on 1 reviews | Write a review
    Low cost spindle motor is 6kW, 3 phase, high precision with ER32 collet, 18000rpm high speed, 2.78Nm torque, with powerful fan, easy to operate and can be connected to the inverter. This air cooled spindle motor is designed for CNC router machine.
    Free Shipping Worldwide
    Delivery date: 6-12 days


    • Cooling: Air cooling, Power: 6kW, Torque: 2.78Nm, 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.

    6kW Air Cooled Spindle Motor Specification

    Model STF60-103-6.0
    Power 6kW
    Phase Three phase
    Speed 18000rpm
    Voltage 3-phase 380V±10% AC
    Current 12.1A
    Frequency 300Hz
    Torque 2.78Nm
    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 14kg

    6kW Air Cooled Spindle Motor Dimension (Unit=mm)

    6kw spindle motor dimension


    In CNC machine tools, spindle motors usually adopt variable frequency speed regulation method. At present, there are three main control modes: general frequency conversion control, vector control and direct torque control.

    1. Common frequency conversion is scalar drive and control. Its drive and control characteristics are constant torque drive. The output power is proportional to the speed. The dynamic performance of the common frequency conversion control is not ideal, the control performance is not good at low speed, the output power is not stable, and it does not have the function of C axis, but it is cheap and simple. It is generally used in grinders and ordinary high-speed milling machines.

    2. Vector control technology imitates the control of DC motor, uses rotor field orientation and vector transformation to realize drive and control, and has good dynamic performance. Vector control driver has a large torque value when it is just started. In addition, the motorized spindle itself has simple structure and small inertia. Therefore, the starting acceleration is high and the allowable limit speed can be achieved instantaneously after starting.

    3. Direct Torque Control (DTC) is a new high-performance AC speed regulation technology developed after vector control technology. Its control idea is novel, the system structure is concise and clear, it is more suitable for driving high-speed spindle motor, and it can meet the requirements of high-speed motorized spindle with high speed and wide speed range.

    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 6kW Air Cooled Spindle Motor for CNC Router
    Very good quality
    This is a very high quality air cooled spindle motor, I used it for CNC machine and worked great. We have no problems yet. I would highly recommend.
    From: Jesset | Date: 29/06/2021
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