Product Description:

The BL-MP400J-25SBB is a brushless servo motor produced by Okuma as part of the BL Servo Motors series. Intended for CNC axes and automated material-handling equipment, the unit converts electrical energy from a matched drive into controlled rotary motion with high positional accuracy. By integrating Okuma’s dedicated encoder channel, the motor supplies the position feedback required for closed-loop control so machine tools, pick-and-place heads, and other electromechanical stages can synchronize speed, torque, and direction while maintaining repeatability.

The motor delivers a continuous rated output of 6.2 kW, which is the mechanical power available at the shaft under nominal load. At a rated speed of 2500 rpm, this operating point reflects the relationship between torque and velocity during constant-duty machining cycles. Position and velocity data travel through Okuma Encoder Link, a proprietary high-speed serial channel that eliminates separate incremental tracks and simplifies cabling. Command accuracy is supported by an embedded resolver with a resolution of 24 bits per revolution, enabling drive controllers to issue fine interpolation steps. The encoder electronics operate from a protected DC +12 V ±30% supply that is sourced by the associated servo amplifier, isolating feedback circuits from mains disturbances.

The feedback system preserves signal integrity up to rotor speeds of 6000 rpm, allowing overspeed detection without losing absolute position. Over a multi-turn span of 7200 rev, the counter remains monotonic, so homing routines are unnecessary after power cycles. Okuma classifies the sensing element as J Type, which indicates mechanical fit and signal coding consistent with current BL drives and cabling. For axis safety during shutdowns, the motor is supplied with a brake; this electromechanical clamp locks the shaft when the drive disables torque, preventing drift on vertical or suspended loads.