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Brushless Servo Drive for Axis Control – OKUMA BL-D15A
The BL-D15A is a brushless servo drive for axis control (“Brushless Servo Drive”) manufactured by OKUMA, a core component of the CNC axis drive system in OKUMA machine tools. The part number identifies a module from the BL-D (Brushless Drive) family rated at approximately 15 A continuous current, revision A. The module interfaces directly with OKUMA’s proprietary OSP (Open System Platform) CNC controller and with OKUMA brushless servo motors of the same brand. Documented on OKUMA vertical and horizontal machining centres and CNC lathes produced from the 1990s through the early 2000s.
The axis servo drive is the power and regulation module that converts position and speed commands from the CNC controller into current for driving the servo motor: it closes the real-time control loop on speed, torque and axis position. If this unit fails, the controlled axis becomes completely inoperative, bringing the machine to an immediate halt and making any automatic machining cycle impossible.
OKUMA is a Japanese CNC machine tool manufacturer founded in 1898, renowned for its vertically integrated production: it designs in-house the machines, numerical controllers (OSP series), servo motors and drives. The BL-D family drives are proprietary components, non-interchangeable with other manufacturers’ products; versions from the 1990s–2000s are legacy / discontinued and available only as used spare parts or through specialist repair centres.
Main Technical Specifications
| Type | Brushless servo drive for axis control (Brushless Servo Drive) |
| Part number | BL-D15A (BLD15A) |
| Brand | OKUMA Corporation (Japan) |
| Known application | OKUMA vertical/horizontal machining centres and CNC lathes with OSP controller (1990s–2000s) |
| Function | Position, speed and current regulation for brushless axis servo motor |
| Rated current | ~15 A (continuous, typical for this class) |
| Supply voltage | 200–230 V AC three-phase |
| Compatible motor | OKUMA BL series brushless servo motors |
| Interfaces / Connectors | OSP serial bus; encoder/resolver connectors; power terminal strip |
| Weight | ~2–5 kg |
| Dimensions | ~150–300 × 100–200 mm |
| Production status | Legacy / discontinued — used/surplus/repair only |