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Spindle Drive OKUMA
Brand: OKUMA -
Cat: Servo Drive
Code:MIV22-3-V3
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Spindle Inverter Drive – OKUMA MIV22-3-V3
The MIV22-3-V3 (main part number MIV223V3) is an electronic spindle inverter drive (“Spindle Inverter Drive”) manufactured by OKUMA, belonging to the MIV series of power modules integrated in OKUMA CNC machining centres and lathes equipped with the OSP (Open System Platform) numerical control. The module handles the conversion of the DC bus voltage into variable-frequency, variable-voltage three-phase power for the spindle motor, operating within the machine’s drive cabinet. The V3 designation indicates the third revision of the MIV22-3 variant, potentially incorporating hardware updates over earlier versions.
The spindle inverter drive is the power electronics module that converts DC bus voltage into variable-frequency and variable-voltage three-phase power for the spindle motor. It receives speed and torque references from the OSP control and maintains stable, precise spindle rotation at any programmed speed and cutting load. Failure of this unit completely disables the spindle, preventing the machine from performing any machining operation.
OKUMA is a Japanese CNC machine tool manufacturer founded in 1898, headquartered in Oguchi, Aichi. Unlike most machine tool builders, OKUMA designs and manufactures its own CNC controls (the OSP series), motors, and drives in-house, resulting in a highly integrated and proprietary system. MIV series components are machine-specific and generally not cross-compatible with other brands; older variants are legacy / discontinued and available only as used stock or through specialist repair services.
Main Technical Specifications
| Type | Spindle inverter drive module |
| Part number | MIV22-3-V3 (MIV223V3) |
| Brand | OKUMA |
| Known application | OKUMA CNC machining centres and lathes with OSP (Open System Platform) control |
| Function | DC bus to variable-frequency three-phase conversion for spindle motor; speed and torque regulation |
| DC bus voltage | ~530–700 V DC |
| Rated power | ~7.5–22 kW |
| Interfaces | Serial/parallel connector to OSP control, motor terminal block, DC bus connector |
| Revision | V3 (third revision of MIV22-3 variant) |
| Weight | ~3–8 kg |
| Dimensions | ~200–400 mm |
| Production status | Legacy / discontinued — used/surplus/repair only |
