Mitsubishi M80 Spindle Drive MDS-EH-SP-20

The Mitsubishi MDS-EH-SP-20 is a spindle drive unit (SP = Spindle) from the MDS-E / MDS-EH CNC drive system, used in Mitsubishi CNC machine tools.

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🔧 Description

• Product type: Spindle drive unit (AC spindle amplifier)
• Series: MDS-EH
• Model: MDS-EH-SP-20
• Manufacturer: Mitsubishi Electric
• Application: CNC machine tool spindle control (lathes, milling machines, machining centers)
• Drive role: Controls the main spindle motor speed and torque
• System type: CNC DC-bus spindle drive system
• Cooling: Forced-air cooling (cabinet mounting)
• Protection: IP20 industrial enclosure use

📌 In Mitsubishi terminology:

• V series = servo (feed axes)
• SP series = spindle drive (main spindle motor)

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⚙️ Key Specifications (SP-20 class)

• Power class: ~2.2 kW spindle drive (typical SP-20 range)
• DC bus input: ~513–648V DC (EH system standard)
• Control power supply: 380–480V AC, 50/60Hz
• Control method: Vector-controlled spindle drive
• Feedback: Spindle encoder / speed feedback system
• Operation: Supports constant torque + constant power spindle control

📌 Heating/drive class reference: SP-20 is the entry spindle drive level in EH series, used for lighter spindle loads compared to SP-40 / SP-80 / SP-160.

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🏭 Typical Applications

• Small CNC lathes
• Compact milling machines
• Auxiliary spindle systems
• Low-to-medium power machining spindles
• Precision light cutting machines

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📊 Position in SP Series

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

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⚠️ Important Notes

• Not a servo axis drive (V series does axis motion; SP does spindle rotation)
• Must be used with Mitsubishi CNC controller systems (M70 / M700 etc.)
• Requires compatible spindle motor + encoder system
• Part of integrated CNC drive architecture (not standalone inverter)