Product Description:

The BL-MS45E-30TN-B is a brushless AC servo motor manufactured by Okuma as part of the BL Servo Motors series. It interfaces with Okuma drive electronics to translate commanded current into controlled shaft motion for CNC axes and automated handling stations. The motor’s construction supports closed-loop velocity and position control, giving machine builders a direct means to coordinate tooling paths and transport sequences without mechanical gearing. Its electrical and magnetic design also favors low rotor inertia so rapid acceleration and deceleration cycles can be executed repeatedly in high-speed production environments.

The stator is wound for a 3-phase supply, which distributes power evenly and minimizes torque ripple. A rotor fitted with 6 poles establishes the commutation sequence that synchronizes with the inverter output. Under rated conditions the windings carry 5.9 Arms, a continuous current used for thermal sizing of cables and drives. The control system excites the windings at 150 Hz; combined with the six-pole geometry, this electrical frequency sets the mechanical output speed. Mechanical output power is specified at 1.4 kW, giving the servo enough capacity for medium-duty feed drives, and it is compatible with the Okuma 30D drive unit class.

Shaft rotation reaches 3000 rpm, enabling linear feedrates appropriate for milling tables, turning spindles, or gantry axes. The electrical design associates this speed with a terminal voltage of 143 V, so the matching inverter regulates motion without excessive voltage reserve. For short overload events the control can deliver up to 24.7 A, allowing the motor to overcome static friction or accelerate heavy loads quickly. When commanded to hold position, a stall torque of 4.9 N-m resists external disturbance until motion resumes. Those ratings must be observed when integrating the servo into automated equipment.