Product Description:

The BL-MS50E-20T-1 belongs to the BL Servo Motors series manufactured by Okuma. It is a brushless AC servo motor used in industrial automation to position and regulate machine-tool axes with high precision. Integrated with an E/F type encoder, the motor feeds real-time feedback to the matching Okuma servo drive so that motion commands are executed accurately and repeatably. This feedback arrangement helps the control loop correct position and speed errors during acceleration, deceleration, and contouring moves. Because it is brushless, there are no brushes to wear during normal operation, which helps maintain stable feedback and commutation behavior.

At a rated output of 1.0 kW, the motor can deliver continuous mechanical power suitable for moderate-load CNC slide tables and rotary attachments. Its rated speed of 2000 RPM is the shaft velocity at which that power is produced, while the corresponding rated current is 4.30 Arms, a value that guides thermal sizing of conductors and protection devices. A stall torque of 5.4 N-m indicates the holding torque the rotor can exert without rotation when energized, and the peak torque ratio of 3× rated torque shows the short-term overload capability during rapid accelerations. To match this transient demand, the associated Okuma amplifier must supply up to 30 A of output so the motor can respond to abrupt load changes without sluggishness. The integrated feedback device also supports commutation and position tracking, and the new stator design improves heat transfer from the windings. That balance of continuous output, torque reserve, and current demand suits feed axes that alternate between steady cuts and short positioning moves.

The electrical circuit is further safeguarded by a current limit of 18.0 A, preventing sustained overcurrent that could overheat the motor windings. The motor uses a 4-pole rotor design, so the drive must synthesize the matching electrical frequency for synchronous operation at the commanded speed. The Taper shaft style simplifies rigid coupling to worm gears or timing pulleys while maintaining concentricity. This shaft form can also help reduce play at the coupling interface when it is installed with compatible mating hardware. Pole count also influences back-EMF frequency as speed rises, which the paired drive must track to keep torque production smooth.