Mitsubishi M80 Spindle Drive MDS-EH-SP-40

The Mitsubishi MDS-EH-SP-40 is a spindle drive unit (AC spindle amplifier) from the MDS-EH series used in CNC machine tools.

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🔧 Description

• Product type: Spindle drive (main spindle motor controller)
• Series: MDS-EH
• Model: MDS-EH-SP-40
• Manufacturer: Mitsubishi Electric
• Function: Controls CNC machine main spindle speed and torque
• Application: CNC lathes, milling machines, machining centers
• Control method: Vector-controlled AC spindle drive
• System type: CNC DC-bus spindle drive system
• Cooling: Forced-air cooling (cabinet installation)
• Protection: IP20 industrial enclosure use

📌 SP series = spindle drive (not axis servo). It is part of the same CNC drive system as V (servo axes).

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⚙️ Key Specifications (SP-40 class)

• Power class: 40A spindle drive category
• Output capability: typically supports mid-range spindle motors (around ~5.5 kW class depending on machine setup)
• DC bus input: 513–648V DC (standard EH system)
• Control power supply: 380–480V AC, 50/60Hz
• Control type: Digital spindle vector control
• Feedback: Spindle encoder / speed feedback system
• Operation modes:
  • Constant torque
  • Constant power (field weakening region)

📌 SP-40 is confirmed as a 40A spindle drive module in the Mitsubishi MDS spindle drive family

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🏭 Typical Applications

• CNC lathes (main spindle)
• Milling machine spindles
• Machining center main spindle control
• Medium-power industrial cutting machines
• Precision metal processing machines

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📊 Position in SP Series

• SP-20 → small spindle (light machines)
• SP-40 → medium spindle (balanced power & speed)
• SP-80 → heavy spindle
• SP-160 / SP-200+ → large industrial spindles

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⚠️ Important Notes

• SP = spindle only (not axis motion like V or V2 drives)
• Works only with Mitsubishi CNC systems (M70 / M700 class controllers)
• Must be paired with compatible spindle motor + encoder
• Part of integrated CNC drive architecture (servo + spindle + power supply modules)