BL-MP400J-20SBA Okuma
Wake Industrial LLC is not an authorized distributor of this product.
The Okuma BL-MP400J-20SBA is a 3-phase AC servo motor and part of the BL Servo Motors series. It has a rated output of 6.7 kW, rated speed of 2000 rpm, and operates at 143 volts with a rated current of 40.8 amps. The motor features a shaft diameter of 1-3/8 inches and uses the ER-JG-7200D encoder model.
Internal Product Review
The BL-MP400J-20SBA is an Okuma AC servo motor built for precise motion control in machine tool applications. Rated output of 6.7 kW and rated speed of 2000 rpm support strong acceleration and consistent servo response under production loads. The ER-JG-7200D encoder adds dependable feedback performance, making this motor a strong choice for high-accuracy axis service.
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Product Description:
The BL-MP400J-20SBA is a three-phase AC servo motor produced by Okuma within the BL Servo Motors series. Designed for precision feed and spindle axes on CNC machine tools, it converts command signals from an Okuma MIV drive into regulated torque that positions slides and rotates workpieces with closed-loop accuracy. Its electrical and mechanical interfaces use Okuma’s common architecture, allowing connection to compatible wiring and mounting hardware. The motor supports controlled acceleration, deceleration, and steady rotation as operating demands change during machining cycles.
It operates on three-phase power delivered by the MIV bus; this balanced supply minimizes neutral currents and supports sinusoidal commutation. The internal windings are tuned for a DC link of 143 V, allowing the inverter to reach rated magnetic flux without oversaturating the iron. At full load, the stator draws 40.8 A, a current that keeps copper losses within permissible thermal limits while sustaining the electromagnetic field. With that electrical input, the motor produces 6.7 kW of mechanical power, making it suitable for medium-frame axes that need fast acceleration and cutting force. The continuous shaft speed capability is 2000 rpm, providing a practical balance between available torque and surface speed on standard ball screw transmissions. Closed-loop regulation allows the connected drive to adjust motor current as the mechanical load changes.
For single-axis machines, the matching inverter is the MIV08DB-1, whereas twin-axis carriages share a larger MIV22-1 unit to conserve cabinet space and simplify bus wiring. Position feedback is generated by an ER-JG-7200D encoder whose 7,200-pulse reference provides fine-step detection for micron-level positioning when interpolated by the CNC. Output torque is carried through a 1-3/8-inch shaft; the generous diameter lowers shear stress during rapid acceleration and mates directly with common taper-bored couplings. The motor, drive, and encoder use compatible thermal sensors, plug connectors, and alarm codes across Okuma’s motion platform. These shared interfaces support consistent communication between the feedback device, inverter, and CNC during operation.
