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

    4.6 out of 5 based on 3 reviews | Write a review
    Hot sale 4.5kW air cooled spindle motor for CNC router with high speed of 18000 rpm, ER32 collet, 2.27 Nm holding torque, works at 380V AC 300Hz, 4pcs P4 grade ceramic ball bearings which improves the service life under high speed revolution.
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    Delivery date: 6-12 days

    4.5 kW CNC spindle motor for sale at good price, 18000 rpm speed, 2.27 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 + 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 STF60-103-4.5
    Matched VFD Model GK3000-4T0075G (10 hp three phase VFD)
    GK3000-CS0075G (10 hp 1-phase 220V to 3-phase 380V VFD)
    Power 4.5 kW
    Phase Three phase
    Speed 18000 rpm
    Voltage 3-phase 380V±10% AC
    Current 9.2A
    Frequency 300Hz
    Torque 2.27 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 & 7002C P4*2
    Application Woodworking & Plastic
    Weight 12 kg
    PDFDownload Attachments 4.5kW Air Cooled Spindle Motor CAD Drawings



    4500W Air Cooled CNC Spindle Motor Details

    Tips: Speed Range of Spindle Motor in CNC Machine When Processing

    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
    Thickness Speed Thickness Speed
    20mm 20000-22000 rpm 20mm 18000-20000 rpm
    15mm 19000-21000 rpm 15mm 16000-18000 rpm
    10mm 18000-20000 rpm 10mm 16000-18000 rpm
    5mm 18000-20000 rpm -- --
    3mm 16000-18000 rpm -- --

    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 least.

    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 4.5 kW Air Cooled CNC Spindle Motor, 18000 rpm, ER32
    How do I install the VFD with the spindle motor?
    We have recently received the 4.5kW spindle motor and VFD your company kindly provided to Collins Aerospace.

    Is it possible for someone at ATO provide the listing, and identification on this motor? Usually, the VFDs have a "labeled" indicating they have been tested by a Nationally Recognized Laboratory such as UL, ETL, CSA, TUV, or other NRTL.

    Would you have such paperwork for this drive such that we can install it according to the National Electric Code NFPA 70 (see article 100 definitions Identified, Labeled, and Listed). I was unable to locate the "listing" of the drive in the detailed user manual nor the ATO name plate of the drive.

    Please tell me what you can provide as I'm unable to "Legally" install the Drive without it being listed and identified by a NRTL.
    From: Don Benson | Date: 24/03/2024
    Was this review helpful? Yes No (0/0)
    ATO Responded
    1. Our VFD only has CE certificate and EMC test report.
    2. The driver ordered is a customized version with single-phase 240V input and three-phase 380V output. This customized version is customized on our regular version, so you can Not see the related list in the user manual.
    You will notice: the 240V voltage connected to the input terminal is connected to the R, T terminals (the S terminal with the screw removed is Not available), and the motor is connected to the output terminals U, V, W. Regarding the installation wiring of this VFD, you can Refer to our demonstration video, see on:
    The lowest rpm of spindle motor
    With a VFD what is the lowest rpm this unit is capable of?
    18000 rpm is too fast for the application we have.
    We will be operating in the 1000-4500 rpm range, is that feasible with this motor and the matching VFD?
    From: rabbie | Date: 19/07/2023
    Was this review helpful? Yes No (0/0)
    ATO Responded
    This motor and the matching inverter can make the motor run in the range of 1000-4500 rpm, but there is not much torque.
    We recommend a customized motor with 1000-4500 rpm.
    Do you have specific parameter requirements and dimensions for the motor?
    Please send us the size chart for further confirmation.
    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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