SJ-BG110F/240-01☐ (Mitsubishi Electric)

SJ-BG110F/240-01☐ is a Mitsubishi Electric SJ-BG series built-in AC spindle motor, designed for high-speed precision CNC machining applications where the motor is integrated directly into the spindle assembly. It belongs to Mitsubishi’s built-in spindle motor family, optimized for compact spindle construction, high rotational speed, and thermal stability.

🔧 Model code breakdown

Code section	Meaning
SJ	Mitsubishi spindle motor family
BG	Built-in spindle motor series
110F	110 mm frame / F-type structural variant
240	24,000 rpm class
01	design / winding variant
☐	optional OEM or machine-builder specification code

So:

SJ-BG110F/240-01☐ = 110 mm built-in spindle motor designed for ~24,000 rpm precision machining applications

🔧 Verified specifications (SJ-BG110F/240-01)

From Mitsubishi’s official SJ-BG specification manual:

Parameter	Value
Series	SJ-BG
Motor type	Built-in AC spindle motor
Continuous rated output	3.0 kW
Short-time rated output	5.5 kW (15% ED)
Standard accel/decel output	5.5 kW
Actual accel/decel output	6.6 kW
Continuous base speed	3000 rpm
Maximum speed	24,000 rpm
Cooling	Liquid/oil jacket cooling
Structure	Integrated spindle motor
Compatible drive	MDS-E-SP-80 / MDS-E-SP2-16080(M)

⚙️ What makes the “110F” variant special

Within the SJ-BG family:

Variant	General positioning
090A	Compact standard high-speed spindle
090B	Improved rigidity/high-speed balance
090D	Higher torque + thermal stability
110F	Larger high-speed spindle with higher rigidity and output

The 110F version is generally used when machines require:

better rigidity than 90-frame BG motors
higher continuous cutting capability
stable long-duration high-speed machining
improved thermal capacity

⚙️ What “☐” means

The square placeholder:

☐ = optional OEM/machine-builder configuration code

This may specify:

encoder type
connector orientation
bearing preload
cooling arrangement
balancing grade
special machine customization

🏭 Typical applications

SJ-BG110F/240-01☐ is commonly used in:

high-speed machining centers
mold & die machining
graphite machining
precision milling
aerospace finishing
compact integrated spindle units

It is selected when machines need:

⚡ very high spindle speed
🎯 precision contour machining
📉 low vibration
🧱 strong spindle rigidity in compact form

⚖️ Position in Mitsubishi spindle lineup

Series	Role
SJ-V	General machining spindle motors
SJ-VL	Low-inertia drilling/tapping
SJ-DG	High-torque cutting spindles
SJ-DL	Ultra high-speed external spindle
SJ-BG	Built-in ultra high-speed spindle motors

🧠 Simple explanation

SJ-BG110F/240-01☐ is a built-in high-speed CNC spindle motor designed for precision machining up to 24,000 rpm, offering compact construction, strong rigidity, and stable thermal performance.

Mitsubishi M80 Built-IN Spindle Motor SJ-BG110F/240-01☐

Description