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OKUMA Servo Drive
Brand: OKUMA -
Cat: Servo Drive
Code:MIV0404-1-B1
| Combination name | Availability | Price |
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Spindle Motor Inverter Drive – OKUMA MIV0404-1-B1
The MIV0404-1-B1 is a spindle motor inverter drive module (“Motor Inverter Unit”) manufactured by OKUMA, a component of the OKUMA OSP (Open System Platform) CNC control system. The module handles power conversion and spindle motor speed loop regulation, receiving digital references from the OSP control unit and generating PWM output to the motor. Available in hardware revision B1. Documented on OKUMA vertical and horizontal machining centres and CNC lathes equipped with the OSP platform.
The spindle motor inverter drive is the electronic power converter that translates the CNC speed reference into voltage and frequency at the spindle motor output: through PWM modulation it maintains the programmed speed even under varying cutting loads. A failure of this module renders the spindle completely uncontrollable, halting all machining operations and forcing an immediate machine stop.
OKUMA Corporation is a Japanese precision machine tool manufacturer headquartered in Nagoya, founded in 1898. OKUMA designs and produces both the machine tools and their own CNC systems (the OSP platform), ensuring complete vertical integration between control and drives. The MIV-series drive components are proprietary to the OKUMA system and are not interchangeable with drives from other manufacturers. This product is legacy / discontinued: available only as used, surplus or through specialist repair.
Main Technical Specifications
| Type | Spindle motor inverter drive module (Motor Inverter Unit) |
| Part number | MIV0404-1-B1 (MIV04041B1) |
| Brand | OKUMA Corporation |
| Known application | OKUMA CNC machining centres and lathes with OSP control (Open System Platform) |
| Function | Power conversion and spindle motor speed regulation via PWM modulation |
| Control interface | Proprietary OKUMA OSP digital bus |
| Supply voltage | ~200–230 V AC three-phase |
| Output current class | ~4 A nominal |
| Revision | B1 |
| Interfaces / connectors | Edge connectors and terminal strip; connection to OSP bus and power stage |
| Weight | ~0.5–2.0 kg |
| Dimensions | ~150–300 mm |
| Production status | Legacy / discontinued — used / surplus / repair only |
