Product Description:

The BL-MH151E-20TN is a rotary actuator produced by Okuma for the BL Servo Motors series. This brushless unit is intended for closed-loop industrial axes where consistent torque, quick reversals, and repeatable positioning are required. When paired with a matching servo amplifier, it delivers commanded motion profiles to machine tool spindles, pick-and-place arms, and automated transfer stations without the maintenance needs associated with carbon brushes. Its closed-loop use also suits applications that require accurate acceleration control and repeatable stopping points during frequent start-stop cycles.

A programmable current ceiling of 62.5 A protects the motor windings during transient peaks, while a continuous rating of 15.4 Arms sets the thermal limit for steady operation at nameplate load. Mechanical output is rated at 3 kW, which corresponds to a shaft speed of 2000 rpm at nominal drive output. For interface design, the associated BL-D or VAC drives must provide up to 75 A of phase current so the motor can reach full dynamic range without current foldback. A factory-installed jumper connector is shipped in the connect position, completing feedback lines between the resolver and the UMC board so field wiring is limited to power and signal trunk lines. That arrangement reduces extra point-to-point wiring at the motor and keeps the feedback circuit organized within the matched drive system.

When the axis encounters a locked-rotor condition, the motor can sustain 15.8 N-m of stall torque, which supports holding capability during static cuts or clamped loads. The permanent-magnet, iron-core topology of this brushless servo motor provides low electrical time constants, so torque rises quickly after each current command. Rapid torque rise is useful where the axis must respond quickly to command changes or load disturbances. The closed feedback arrangement keeps the resolver circuit in place at the motor assembly, which simplifies external connections while supporting stable servo response.