SJ-BG160D/150-01(R) (Mitsubishi Electric)

SJ-BG160D/150-01(R) is a Mitsubishi Electric SJ-BG series built-in AC spindle motor, intended for high-precision CNC machining centers that require:

integrated spindle motor construction
high rigidity
stable thermal characteristics
strong medium/high-speed cutting capability

It belongs to Mitsubishi’s SJ-BG built-in spindle family, where the motor is directly integrated into the spindle assembly instead of using belts or external spindle motors. (mitsubishielectric.com)

🔧 Model code breakdown

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

So:

SJ-BG160D/150-01(R) = 160 mm built-in spindle motor designed for ~15,000 rpm precision machining with enhanced rigidity

🔧 Verified specifications

From Mitsubishi SJ-BG spindle motor manuals: (mitsubishielectric.com)

Parameter	Value
Series	SJ-BG
Motor type	Built-in AC spindle motor
Continuous rated output	3.7 kW
Short-time rated output	7.5 kW (10% ED)
Standard accel/decel output	7.5 kW
Actual accel/decel output	9.0 kW
Continuous base speed	3500 rpm
Short-time base speed	3500 rpm
Maximum speed	15,000 rpm
Continuous torque	10.1 N·m
Short-time torque	20.5 N·m
Rotor inertia	0.0048 kg·m²
Cooling	Liquid/oil jacket cooling
Stator mass	~7.1 kg
Rotor mass	~2.9 kg

⚙️ What makes the “160D” version different

Within the SJ-BG family:

Variant	Positioning
160B	balanced high-speed spindle
160D	higher rigidity / stronger cutting capability

The D-type version generally provides:

stronger spindle rigidity
improved thermal stability
higher continuous machining stability
better cutting performance under load

Compared with the 160B variant, the 160D is optimized more toward:

stable cutting force
sustained machining accuracy
heavier precision machining

rather than only compactness/high speed.

⚙️ What “(R)” means

The (R) suffix typically indicates:

revised rotor specification
balancing revision
OEM/machine-builder customization

It does not indicate a different spindle family. (manualzz.com)

🏭 Typical applications

SJ-BG160D/150-01(R) is commonly used in:

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

It is selected when machines need:

⚡ integrated spindle construction
🎯 high contour accuracy
🧱 stronger rigidity than compact BG variants
📉 low vibration and thermal growth

⚖️ 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-BG160D/150-01(R) is a built-in CNC spindle motor designed for precision machining up to about 15,000 rpm, optimized for integrated spindle construction, stronger rigidity, and stable continuous cutting performance.

Mitsubishi M80 Built-IN Spindle Motor SJ-BG160D/150-01(R)

Description