Product Description:

The BL-MC140E-20SB is a three-phase permanent-magnet servo motor manufactured by Okuma as part of the BL Servo Motors series. It serves as a drive element in computer numerical control machines and material-handling cells where accurate speed regulation and repeatable positioning are essential. By pairing a laminated stator with rare-earth rotor magnets, the motor delivers responsive torque for continuous industrial duty while occupying a compact footprint in multi-axis assemblies. This arrangement supports controlled acceleration and stable response during repeated start-stop motion in feed axes and similar automated mechanisms. Its compact construction is useful where several servo axes must be mounted close together on a machine frame or transfer module.

The unit is rated for an output of 2.8 kW, which is the mechanical power it can deliver during steady operation. At this rating, the motor draws 12.5 A from the amplifier, so the connected drive must supply that current under normal load conditions. Nominal shaft velocity reaches 2000 rpm, which helps relate commanded frequency to linear feed rates on ball-screw or belt-driven systems. When commanded to hold position, the rotor can resist up to 13.7 N·m of stall torque, allowing cutting forces or axis loads to be opposed without an external holding brake. These operating points suit applications that need steady running speed, quick indexing, and consistent torque response through repeated production cycles. In feed systems, that combination of power, current, speed, and torque supports both continuous travel and momentary load peaks during direction changes.

Rated phase voltage is 133 V at a supply frequency of 133 Hz, which keeps the electrical operating point clear for matching with the drive. An 8-pole rotor supports smooth commutation and helps the feedback system track rotor position during contouring moves. Compliance with IEC 34 indicates alignment with established requirements for insulation, vibration, and thermal performance in industrial equipment. The winding is terminated in a Y connection to balance phase voltages under three-wire feeds and to support stable operation across the motor’s rated range.