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    7.5 kW Air Cooled CNC Spindle Motor, 18000 rpm, ER32

    5 out of 5 based on 2 reviews | Write a review
    7.5 kW air cooled spindle motor for sales, it features 18000 rpm high speed, 3.58 Nm torque, ER32 collet, 3 phase 380V AC at 300Hz, high quality 4pcs bearings, IP50 for protection grade, used in CNC drilling and milling equipment.
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    Delivery date: 6-12 days

    7.5 kW CNC spindle motor for sale at good price, 18000 rpm speed, 3.58 Nm torque, 300Hz frequency, 3 phase 380V AC operating voltage, ER32 (φ3.175 mm - φ20 mm) collet.


    • Spindle motor with air cooling fan and ER32 collet ensures smooth running.
    • Fast response, strong overload capacity, low noise and high mechanical precision.
    • High quality 4 pcs bearings (7008Cx2 + 7004Cx2), 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 STF60-103-7.5
    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
    Phase Three phase
    Speed 18000 rpm
    Voltage 3-phase 380V±10% AC
    Current 15.3A
    Frequency 300Hz
    Torque 3.58 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 ER32 (φ3.175 mm - φ20 mm)
    Bearings Type 7008C P4*2 & 7004C P4*2
    Application Woodworking & Plastic
    Weight 16 kg
    PDFDownload Attachments 7.5kW Air Cooled Spindle Motor CAD Drawings



    7500W Air Cooled CNC Spindle Motor Details

    Tips: How to Choose Right VFD Matching Spindle Motor?

    Variable frequency drive adopts frequency conversion technology and micro-electronic technology, by changing the working power frequency of the spindle motor, so as to achieve the purpose of energy saving speed regulation. The selection of frequency inverter should match the voltage, power and frequency of the spindle motor to maximize its utility.

    1. Set the VFD reference frequency. The reference frequency of the VFD is set according to the highest frequency of the motorized spindle. If the reference frequency of the VFD is not set, the spindle motor will burn out immediately after it starts running.
    2. The maximum frequency, rotation frequency and corresponding voltage of the VFD are set according to the curve in the instruction.
    3. The current of the VFD is set according to the rated current of the spindle motor.
    4. Set the overload current to 120% of the rated current of the spindle motor.
    5. Set the overload trip level to 100% and the overload trip time to 5s. Carrier frequency Settings are related to spindle motor power, with spindle motors less than 10 kW set at 8 KHz, spindle motors over 10 kW set at 5 KHz, and acceleration and deceleration times set at 10 S-20s. When the starting current exceeds the rated current protection, the acceleration time should be extended.
    6. After the power is switched on, VFD starts to observe whether the rotation direction of the spindle motor is consistent with the direction indicated by the motorized spindle. If the rotation direction is inconsistent, the power supply should be cut off immediately, and check the three-phase power mode connected with the inverter and spindle motor. It is strictly prohibited to run the spindle motor wrong in the direction of rotation.

    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 Air Cooled CNC Spindle Motor, 18000 rpm, ER32
    High quality 7.5kw air cooled spindle motor
    This is a high-quality air cooled spindle motor, I used it for a CNC machine. So far it works well. I would recommend it to my friends.
    From: Rojas | Date: 07/02/2023
    Was this review helpful? Yes No (0/0)
    Good 7.5kW air cooled CNC spindle motor
    Do you proivde cables / connectors to connect your CNC spindle motor with your VFD?
    From: Craig | Date: 13/07/2021
    Was this review helpful? Yes No (0/0)
    ATO Responded
    We do not provide cables, but we will provide the cables connectors, and the female connector, so you just need to solder the cables.
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