BL-MP400J-20S Okuma
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The Okuma BL-MP400J-20S is a servo motor from the BL Servo Motors series, designed with an 8-pole permanent magnet field and an ER-J-7200D encoder. It features a continuous output of 6.7 kW, operates at 2000 min-1 rated speed, and has a stall torque of 45.8 Newton-meters. The motor runs on 3-phase power at 143 V and 40.8 A, follows the IEC 34 standard, and uses Y winding connection.
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Product Description:
The BL-MP400J-20S is a rotary servo motor manufactured by Okuma for the BL Servo Motors series. Intended for precision motion control, it works with Okuma drive amplifiers to position slides, spindles, or tool changers under numerical control. By translating command signals into regulated shaft output, the motor enables machine tools to achieve repeatable velocity profiles, accurate contouring, and tight synchronization with other axes in automated cells. Its compact construction fits directly into equipment where high dynamic response and limited maintenance are priorities, while the low-inertia magnetic circuit helps keep acceleration times short.
Energy conversion is handled by a permanent-magnet field that supports a continuous mechanical output of 6.7 kW. The motor uses three-phase power, so the three stator windings share current evenly at the rated line voltage of 143 V. When supplied through a Y connection, the stator operates at a synchronous electrical frequency of 133 Hz while the shaft turns at the rated speed of 2000 rpm. Under these conditions, the drive must deliver 40.8 A of phase current, which is relevant when selecting cables, overload protection, and amplifier outputs. Compliance with IEC 34 supports standardized dimensional and insulation requirements for the motor. The permanent-magnet design provides efficient torque production without requiring a separately excited rotor field.
A stall torque of 45.8 N·m provides high starting capability and allows the shaft to resist static loads during closed-loop positioning. The motor has 8 magnetic poles that work with the stator frequency to produce the electrical cycles needed for smooth commutation at low speed. Rotor position feedback is provided by the ER-J-7200D encoder, which transmits incremental signals to the controller for real-time velocity measurement and phase alignment. This feedback allows the connected drive to correct position errors as operating loads change. Stable low-speed performance supports controlled cutting operations, while the available acceleration assists with rapid indexing. Accurate feedback also helps the motor maintain commanded position during dwell periods in automated machine installations.
