SJ-BG160B/150-01 (R) (Mitsubishi Electric)

SJ-BG160B/150-01 (R) is a Mitsubishi Electric SJ-BG series built-in AC spindle motor, designed for high-precision CNC machining centers requiring:

integrated spindle construction
high rigidity
stable thermal performance
medium/high-speed machining capability

It belongs to Mitsubishi’s built-in spindle motor family, where the motor is directly integrated into the spindle instead of using belts or external spindle motors.

🔧 Model code breakdown

Code section	Meaning
SJ	Mitsubishi spindle motor family
BG	Built-in spindle motor series
160B	160 mm frame, B-type structural variant
150	15,000 rpm class
01	winding/design version
(R)	revised rotor/OEM configuration variant

So:

SJ-BG160B/150-01(R) = 160 mm built-in spindle motor designed for ~15,000 rpm precision machining with integrated spindle construction

🔧 Verified specifications

From Mitsubishi official SJ-BG spindle motor specification manuals:

Parameter	Value
Series	SJ-BG
Motor type	Built-in AC spindle motor
Continuous rated output	2.2 kW / 3.7 kW variants
Short-time rated output	3.7 kW (40% ED) or 7.5 kW (10% ED)
Standard accel/decel output	3.7–7.5 kW
Actual accel/decel output	4.44–9.0 kW
Maximum speed	15,000 rpm
Base speed	1300–3500 rpm (drive configuration dependent)
Continuous rated torque	6.0 / 16.2 / 20.0 N·m depending on drive combination
Rotor inertia	0.0048 kg·m²
Cooling	Liquid/oil jacket cooling
Structure	Integrated spindle motor
Stator mass	~7.1 kg
Rotor mass	~2.9 kg

⚙️ What makes the “160B” variant special

Within the SJ-BG family:

Variant	Positioning
120A	Compact high-speed spindle
120C	Higher rigidity 20k rpm spindle
150D	Heavy-duty 15k rpm spindle
160B	Larger integrated spindle with balanced rigidity and speed

The 160B version is generally optimized for:

improved spindle rigidity
stable thermal behavior
medium/high-speed cutting
compact integrated spindle assembly

Compared with smaller BG motors, the 160B provides:

larger rotor/stator structure
higher rigidity
better continuous machining stability

⚙️ What “(R)” means

The (R) suffix indicates a:

revised rotor specification
balancing variation
OEM/machine-builder customized version

It is not a different spindle family, only a configuration revision.

🏭 Typical applications

SJ-BG160B/150-01(R) is commonly used in:

high-speed machining centers
mold & die machining
precision contour milling
aerospace finishing
compact integrated spindle systems
continuous precision production machining

It is selected when machines need:

⚡ integrated high-speed spindle construction
🎯 stable precision machining
📉 low vibration
🧱 improved rigidity over smaller BG spindle motors

⚖️ Position in Mitsubishi spindle lineup

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

🧠 Simple explanation

SJ-BG160B/150-01(R) is a built-in CNC spindle motor designed for precision machining up to about 15,000 rpm, combining integrated spindle construction with higher rigidity, stable thermal behavior, and low vibration performance.

Mitsubishi M80 Built-IN Spindle Motor SJ-BG160B/150-01 (R)

Description