BL-MC500E-15SB Okuma
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The Okuma BL-MC500E-15SB is part of the BL Servo Motors series and features a continuous duty rating with a permanent magnet rotor type. This 3-phase, 8-pole motor operates at a rated power of 7.5 kW, with a rated current of 32.6 Amps and a rated speed of 1500 RPM. It is compliant with IEC 34 standards and has a stall torque of 52.5 Newton-meters.
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Product Description:
The BL-MC500E-15SB is a servo motor manufactured by Okuma for the BL Servo Motors series. Designed for medium-power axis drives in machining centers and automated cell transfer systems, the motor converts electrical energy into regulated rotary motion under feedback control. A permanent-magnet rotor provides repeatable torque at low speed and high positional resolution, qualities necessary for contouring or synchronized spindle tasks. Mechanical dimensions, insulation, and grounding arrangements follow IEC 34, allowing the unit to integrate with globally standardized enclosures and protective devices.
The electrical section is configured for continuous operation, so thermal equilibrium is maintained at the nameplate load without time-based derating. Three stator windings accept a three-phase supply and produce an eight-pole magnetic field, providing smooth torque at a moderate base frequency. Under rated conditions, the drive must deliver 32.6 A of sinusoidal current to establish the magnetic flux required for the motor’s listed output. Electrical excitation is synchronized to a fundamental frequency of 133 Hz, which works with the pole count to establish the mechanical base speed and commutation timing in the CNC amplifier.
With the stated current and frequency applied, the shaft provides 7.5 kW of mechanical power at a rated speed of 1500 rpm. This speed allows direct coupling to gearless tables or moderate-ratio reducers while preserving the surface finish on machined parts. The winding impedance is designed for a nominal line voltage of 133 V, simplifying cabinet design because the drive’s DC bus does not require excessive voltage boosting. When motion is stopped, the magnetic circuit can provide up to 52.5 N·m of stall torque, which secures tool position during cutting starts or axis clamping sequences.
