3.7 kW Water Cooled CNC Spindle Motor, 24000 rpm, ER20

3.7 kW water-cooled CNC spindle motor at a fair price, 24000 rpm speed, 1.45 Nm torque, 400Hz frequency, 3 phase 220V/380V AC operating voltage, ER20 (φ3.175 mm - φ13 mm) collet.

Feature

• Spindle motor with superior durability ER20 collet ensures smooth running.
• Fast response, strong overload capacity, low noise, and high mechanical precision.
• High-quality 3 pcs bearings (7005Cx2 + 7003Cx1), runout off less than 0.01mm, tapered bore less than 0.005mm.
• P4 grade ceramic ball bearings are used as spindle bearings, 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.

Application

This series of air-cooled electric spindle motors is designed primarily for use with variable frequency drives or engraving machines, as well as CNC routers. It is ideal for high-speed profiling, drilling, cutting, engraving, and groove milling across a variety of materials, including wood, metal, plastics, foam, and rubber.

Note: Ensure that the spindle motor and VFD are compatible. The VFD’s specifications and parameter settings must align with the spindle motor’s nominal parameters. Incorrect settings can lead to spindle motor damage or burnout.

Specification

Model		STZ100-3.7-ER20
Power		3.7 kW
Diameter		φ100 mm
Phase		Three phase
Speed		24000 rpm
Voltage		3-phase 380V±10% AC		3-phase 220V±10% AC
Current		8A		10A
Matched VFD Model		GK3000-4T0055G (7.5 hp three phase VFD)		GK3000-4T0055G (7.5 hp three phase VFD)
Frequency		400Hz
Torque		1.45 Nm
Number of Pole		2 poles
Cooling Type		Water-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 - φ13 mm)
Bearings Type		7005C P4*2 & 7003C P4*1
Application		Woodworking & Plastic
Weight		9 kg
Download Attachments		3.7 kW Water Cooled Spindle Motor CAD Drawings

Details

Tips: 3 Control Mode of Spindle Motor in CNC Machine

In CNC machine tool processing, the spindle motor mainly has three control methods: Ordinary frequency conversion control, vector control and direct torque control.

Ordinary frequency conversion is scalar drive and control, and its drive control characteristic is constant torque drive, and the output power is proportional to the speed. The dynamic performance of ordinary frequency conversion control is not ideal, the control performance is not good at low speed, the output power is not stable enough, and it does not have the C-axis function. But the price is cheap, the structure is simple, and it is generally used for grinders and ordinary high-speed milling machines.

The vector control technology imitates the control of a DC motor, oriented by the rotor magnetic field, and realizes the drive and control by the method of vector transformation, which has good dynamic performance. The vector control drive has a large torque value when it is just started, and the spindle motor itself has a simple structure and small inertia, so the starting acceleration is large, and the allowable limit speed can be reached instantaneously after starting. This kind of driver has two kinds of open loop and closed loop. The latter can realize position and speed feedback, not only has better dynamic performance, but also can realize the C-axis function; while the former has a slightly worse dynamic performance and does not have C-axis function, but the price is cheaper.

Direct torque control is another new type of high-performance AC speed control technology developed after vector control technology. Its control idea is novel, the system structure is simple and clear, and it is more suitable for the driving of high-speed electric spindles and can meet the requirements of high-speed spindle motors. The dynamic and static characteristics of high speed, wide speed range, high speed, and instant stop have become a hot technology in the field of AC drive.