CNC Spindle Motor 7.5 kW, 18000 RPM, 380V Air-Cooled Square ER40

The 7.5 kW Air-Cooled Square Spindle Motor is a high-stability industrial powerhouse designed for substantial CNC tasks that demand significant cutting force and thermal reliability. Featuring a robust square body design for enhanced mounting rigidity, this motor delivers a high torque of 6.65 Nm, making it the primary choice for CNC pattern making, industrial foam cutting, and heavy wood carving. Operating at 18,000 RPM with a frequency range of 300 Hz – 400 Hz, it ensures efficient material removal across dense substrates. The spindle is equipped with a premium P4 bearing configuration (2x 7010 & 2x 7005) to handle high radial and axial loads, while the ER40 collet system supports large-diameter tools up to 30mm. At 30 kg, this 380V motor provides the mass and precision required for high-stability machining centers where water-cooling is not feasible.

Industrial 7.5 kW High-Torque Performance
Stable Square Body design for rigid mounting
Precision P4 Grade Bearing Assembly (7010 & 7005)
300 Hz – 400 Hz high-frequency stable operation
Powerful Air Cooling for continuous industrial use
Large ER40 Collet system for tools up to 30mm

⚡ Quick Technical Datasheet:

Power OutputN/A

Max SpeedN/A

Voltage RatingN/A

Collet InterfaceER Standard

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Comparative Technical Spindle Motor Configurations Matrix

Use the structural data catalog matrix below to evaluate power outputs, maximum RPM, operating voltages, and cooling styles across standard TriQuench CNC spindle models.

Spindle Capacity	Operating Speed	Operating Voltage	Cooling System
12.0 kW	18,000 RPM	380 V	Water-Cooled
0.8 kW	24,000 RPM	220 V	Air-Cooled (Long Shaft)
3.7 kW	40,000 RPM	380 V	Water-Cooled ISO20
9.0 kW	18,000 RPM	380 V	Air-Cooled

Technical Specifications

Technical Parameter	Engineering Specification Value
MAX SPEED	18000 RPM
MECHANICAL	weight: 30 Kg \| coolingType: Air Cooled (Industrial Fan) \| bodyType: Square Profile
FREQUENCY	300 Hz - 400 Hz
POLE COUNT	2 Pole
BEARING CONFIGURATION	2 x 7010 P4 (Front), 2 x 7005 P4 (Rear)
POWER RATING	7.5 kW
OPERATING VOLTAGE	380 V AC
RATED CURRENT	28.7 A
RATED TORQUE	6.65 Nm
COLLET INTERFACE	ER40 (3mm - 30mm)

Industrial Applications

Usage Scenario	Target Industry
Industrial CNC Router Manufacturing	Industrial Machine Tool Manufacturing
CNC Pattern Making and Foundry Tooling	Aerospace and Automotive Tooling
Large-Scale Foam Cutting and Shaping	Foundry and Pattern Shops
Heavy Wood Carving and Panel Processing	Commercial Woodworking and Furniture
Acrylic and Composite Material Routing	Packaging and Display Manufacturing
VMC Tooling and Headstock Retrofitting	General Engineering

Technical FAQ & Operational Guide

What is the advantage of a square body design for a 7.5kW spindle?

The square body provides a larger and flatter mounting surface compared to round spindles. This enhances the overall rigidity of the machine headstock, significantly reducing vibration during heavy-duty cutting operations and improving surface finish.

Does this spindle require a water chiller?

No, this is an air-cooled model. It utilizes a high-performance integrated fan to dissipate heat, making it easier to maintain and install in environments where liquid cooling systems are impractical.

Can I use large diameter tools with this spindle?

Yes, the ER40 collet interface is designed for heavy industrial use, supporting tool shanks from 3mm up to 30mm. This is ideal for large material removal bits used in pattern and foam cutting.

How is the rotational balancing calibrated on this spindle motor?

Every spindle motor is dynamically balanced in accordance with the ISO 1940 balancing standard to guarantee vibration-free running and maximum stability at high RPMs.

What are the runout tolerances of the shaft and collet interface?

The internal shaft taper maintains a runout accuracy tolerance of under 0.003mm (3 microns), maintaining precise tool concentricity and preventing premature cutter wear.

What cooling precautions are built-in to prevent heat exhaustion?

Built-in temperature dissipation channels support continuous water/liquid cooling circulation or forced fan airflow, preventing thermal expansion of components.

Is this spindle motor compatible with standard VFD inverters and collets?

Yes, the spindle supports direct electrical integration with standard variable frequency drives (VFD) and accepts industrial ER collets (ER11, ER20, ER25, or ER32) to match standard toolholder dimensions.

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CNC Spindle Motor 7.5 kW, 18000 RPM, 380V Air-Cooled Square ER40

Industrial 7.5 kW High-Torque Performance

Stable Square Body design for rigid mounting

Precision P4 Grade Bearing Assembly (7010 & 7005)

300 Hz – 400 Hz high-frequency stable operation

Powerful Air Cooling for continuous industrial use

Large ER40 Collet system for tools up to 30mm

⚡ Quick Technical Datasheet:

Power OutputN/A

Max SpeedN/A

Voltage RatingN/A

Collet InterfaceER Standard

Comparative Technical Spindle Motor Configurations Matrix

Use the structural data catalog matrix below to evaluate power outputs, maximum RPM, operating voltages, and cooling styles across standard TriQuench CNC spindle models.

Spindle Capacity	Operating Speed	Operating Voltage	Cooling System
12.0 kW	18,000 RPM	380 V	Water-Cooled
0.8 kW	24,000 RPM	220 V	Air-Cooled (Long Shaft)
3.7 kW	40,000 RPM	380 V	Water-Cooled ISO20
9.0 kW	18,000 RPM	380 V	Air-Cooled

Technical Parameter

Engineering Specification Value

MAX SPEED

18000 RPM

MECHANICAL

weight: 30 Kg | coolingType: Air Cooled (Industrial Fan) | bodyType: Square Profile

FREQUENCY

300 Hz - 400 Hz

POLE COUNT

2 Pole

BEARING CONFIGURATION

2 x 7010 P4 (Front), 2 x 7005 P4 (Rear)

POWER RATING

7.5 kW

OPERATING VOLTAGE

380 V AC

RATED CURRENT

28.7 A

RATED TORQUE

6.65 Nm

COLLET INTERFACE

ER40 (3mm - 30mm)

Usage Scenario

Target Industry

Industrial CNC Router Manufacturing

Industrial Machine Tool Manufacturing

CNC Pattern Making and Foundry Tooling

Aerospace and Automotive Tooling

Large-Scale Foam Cutting and Shaping

Foundry and Pattern Shops

Heavy Wood Carving and Panel Processing

Commercial Woodworking and Furniture

Acrylic and Composite Material Routing

Packaging and Display Manufacturing

VMC Tooling and Headstock Retrofitting

General Engineering