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OKUMA Servo Drive
Brand: OKUMA -
Cat: Servo Drive
Code:BLII-D7575A
| Combination name | Availability | Price |
|---|---|---|
Brushless II Servo Drive – OKUMA BLII-D7575A
The BLII-D7575A is an AC brushless servo drive (“AC Brushless Servo Amplifier”) from the BLII (Brushless II) series manufactured by OKUMA Corporation, designed for CNC machining centers, lathes, and milling machines equipped with OKUMA’s proprietary OSP (Open System Platform) control. The module is a digital drive that manages speed and current control loops for AC brushless servo motors on the working axes. The suffix “D7575A” identifies the size variant and revision within the BLII series; versions with different torque/power ratings may exist.
The servo drive is the power electronic stage that energises and regulates the axis servo motor: it converts digital commands from the CNC into precise phase currents, closing the speed and position control loops. A failure of the BLII-D7575A renders the corresponding axis uncontrollable, causing immediate machine stoppage and the risk of dimensional rejects or collisions during the machining operation in progress.
OKUMA Corporation is a Japanese manufacturer founded in 1898 in Oguchi, Aichi, and one of the world’s largest producers of CNC machine tools. OKUMA is one of the few manufacturers in the world to design machine, CNC control (OSP), and servo/spindle drives entirely in-house, ensuring full system integration. The BLII series belongs to a mature generation of the OKUMA product portfolio; all products in this line are legacy / discontinued and available only as used, surplus, or through specialist repair services.
Main Technical Specifications
| Type | Servo drive / AC brushless servo amplifier |
| Part number | BLII-D7575A (BLIID7575A) |
| Brand | OKUMA Corporation |
| Known application | OKUMA CNC machining centers, lathes, and milling machines with OSP control |
| Series | BLII (Brushless II) |
| Function | AC brushless servo motor drive and speed/current regulation |
| Input supply | Three-phase ~200–400 V AC, 50/60 Hz |
| Rated current | ~7.5–75 A |
| Control interface | Proprietary OSP serial bus / dedicated OKUMA connectors |
| Feedback | Incremental or absolute encoder from servo motor |
| Logic supply voltages | ±15 V and +5 V DC |
| Weight | ~3–8 kg |
| Dimensions | ~250–450 mm L |
| Production status | Legacy / discontinued — used/surplus/repair only |
