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MITSUBISHI Spindle Drive
Brand: MITSUBISHI -
Code:MDS-B-SP-185
| Combination name | Availability | Price |
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Spindle Drive Amplifier – MITSUBISHI MDS-B-SP-185
The MDS-B-SP-185 is an AC spindle amplifier (“Spindle Amplifier”) from the MDS-B series manufactured by Mitsubishi Electric, designed for vector control of AC spindle motors in CNC machine tools. It is documented as a component of Mitsubishi’s MELDAS 600, MELDAS 640 and M64 CNC systems, where it performs speed and torque regulation of the main spindle motor. The “SP” suffix identifies the spindle variant within the MDS-B family, while “185” denotes a rated output current of 185 A. It is not interchangeable with the servo-axis variants MDS-B-V1 and MDS-B-V2. Available in different input voltage ratings (200 V and 400 V classes).
The MDS-B-SP-185 spindle amplifier is the heart of the spindle regulation system: it receives speed and torque references from the CNC controller via Mitsubishi’s proprietary high-speed serial servo bus and closes the current and speed loops on the AC spindle motor, ensuring stable rotation and constant cutting power throughout the machining process. A failure of this drive causes immediate spindle shutdown and machine stop: without this module no machining cycle can be started, resulting in complete production downtime and an extraordinary maintenance intervention.
Mitsubishi Electric is one of Japan’s leading industrial electronics multinationals, with its FA (Factory Automation) division specialising in CNC systems, servo drives, inverters and industrial robots for over fifty years. The MDS-B series was manufactured from the 1990s to the early 2000s and is now legacy / discontinued: replacement models belong to the MDS-C1 and MDS-D families, which are not always plug-in compatible with existing wiring.
Main Technical Specifications
| Type | AC spindle amplifier (Spindle Drive) |
| Part number | MDS-B-SP-185 (MDSBSP185) |
| Brand | Mitsubishi Electric – FA (Factory Automation) Division |
| Known application | Mitsubishi CNC systems MELDAS 600 / MELDAS 640 / M64 – machining centres and CNC lathes |
| Function | Vector speed and torque regulation of AC spindle motor |
| Input voltage | 3~ 200–230 V AC or 380–480 V AC, 50/60 Hz (verify nameplate) |
| Rated output current | 185 A |
| Rated output power | ~18.5 kW |
| CNC interface | Mitsubishi proprietary high-speed serial servo bus |
| Feedback | Encoder / speed transducer from spindle motor |
| Cooling | Internal forced-air ventilation |
| Weight | ~10–20 kg |
| Dimensions | ~300–400 mm × 450–550 mm × 150–200 mm (W × H × D) |
| Production status | Legacy / discontinued — used/surplus/repair only |
