Product Description:

The BL-MC200J-20SNA-A is a rotary servo motor manufactured by Okuma for the BL Servo Motors series. It supplies closed-loop motion to machine axes in automated cells, translating drive commands into controlled mechanical output. Designed for integration with Okuma amplifiers, the unit uses a permanent-magnet field and an ER feedback encoder to give the controller accurate position and velocity data during continuous duty. This feedback arrangement helps the drive maintain stable axis regulation during repeated positioning moves and steady-speed cutting passes. Its compact housing fits into tight spindle or feed-drive compartments.

During sustained operation, the motor delivers a continuous mechanical output of 4 kW while drawing a rated armature current of 14.7 A from the drive. At the nominal bus voltage of 157 V, it reaches a rated speed of 2000 rpm, giving a power range suited to medium-inertia loads on metal-cutting equipment. Because the stator windings are energized through a three-phase supply, torque production remains smooth across the full electrical cycle. The permanent-magnet topology minimizes rotor losses, and Control Type J identifies the parameter set expected by the associated amplifier. The integrated Okuma ER encoder supplies high-resolution feedback so that the controller can tune current loops and reject transient disturbances without auxiliary sensors.

The motor has a stall torque of 21 N·m, allowing the axis to hold heavy tables or tool turrets without motion when commanded current is maintained. An 8-pole rotor shortens the electrical period, so the magnetic field can be commutated at the operating electrical frequency of 133 Hz with minimal phase lag. The windings are connected in a delta configuration, giving lower impedance and faster current rise times than a comparable wye layout. This connection supports quick current response during acceleration and direction changes.