BL-MC300E-12SB Okuma
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The Okuma BL-MC300E-12SB is a BL Servo Motor that provides a continuous output of 3.6 kW and operates at a voltage of 141 V. As part of the BL Servo Motors series, it has a current rating of 14.7 A, features a permanent magnetic motor field, and uses an Okuma ER encoder. The motor runs at 80 Hz with a speed of 1200 min-1 and a stall torque of 31.5 N-m.
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Product Description:
The BL-MC300E-12SB is a servo motor produced by Okuma within the BL Servo Motors series. It is engineered for medium-power axes that require dependable duty cycling across long production shifts. The model belongs to the manufacturer’s permanent-magnet brushless lineup and works with Okuma drives to position feed screws and rotary tables in CNC machining centers and other automated equipment. By converting electrical commands into accurately controlled mechanical rotation, the unit supports repeatable, high-precision industrial motion. Its brushless design avoids the mechanical wear associated with brushes and commutators during sustained operation.
The continuous output power is rated at 3.6 kW, indicating the mechanical power the shaft can deliver without exceeding the motor’s thermal limits. To reach that output, the drive supplies a continuous phase current of 14.7 A at a line-to-line voltage of 141 V. Under these electrical conditions, the rotor operates at 1200 rpm with a commanded electrical frequency of 80 Hz when the pole count is considered. The permanent-magnet field eliminates the need for separate rotor excitation and helps limit heat generation during constant-torque operation. These electrical values allow the connected drive to regulate the motor while maintaining stable performance during extended machining cycles.
The stall torque reaches 31.5 N·m, indicating the torque available while the shaft is stationary. Torque is produced by an 8-pole rotor that receives balanced power from a three-phase inverter, supporting smooth electromagnetic coupling throughout the operating speed range. The windings use a Y configuration, which reduces the voltage applied across each individual phase compared with the line-to-line voltage. Rotor position feedback comes from an Okuma ER incremental encoder, allowing the drive to close the speed and position control loops with high resolution. The feedback signal helps the controller correct motion errors caused by changing loads or acceleration demands. This arrangement supports accurate feed-axis and rotary-table movement in equipment that requires controlled speed, torque, and position.
