Product Description:

The BL-MC300J-12S is a servo motor produced by Okuma within the BL Servo Motors series. It is designed for closed-loop motion axes where a rotary actuator must deliver constant torque at low speed and fine incremental positioning. In automated machine tools and material-handling cells, this motor converts electrical power from the matched drive into mechanical rotation that is synchronized with encoder feedback for accurate velocity and position control. That control approach is useful on feed axes that must start, stop, and reverse without losing positional accuracy.

This model draws power from a nominal 141 VAC line and is wound for three-phase operation, so each stator coil receives a phase-shifted waveform that produces a rotating magnetic field. The rotor is built with 8 poles, a geometry that balances torque density against cogging and electrical frequency. Under continuous duty it develops a mechanical output of 3.6 kW, and this rating marks the thermal load the motor can sustain without additional cooling. The rated speed is 1200 rpm, which suits low-noise, high-torque feed drives rather than high-speed spindles. These electrical and mechanical values affect inverter loading, reflected inertia, and axis response during acceleration and deceleration.

Position information is supplied by an ER-J7200D feedback device. This unit is a J-type absolute encoder, so each shaft position is reported as an unambiguous digital value after power-up and the control system does not require a homing routine before motion begins. The output shaft has a diameter of 1-3/8 in, sized for medium-torque couplings, and it uses a straight shaft configuration so standard couplings or collars can be mounted without adapting tapers or splines. These interface details allow direct integration with gearboxes, ball screws, or timing pulleys while the encoder preserves position tracking through repeated start-stop cycles.