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Key Technical Specifications
| Parameter | Specification |
| Motor Type | Permanent Magnet DC Disc Armature Motor (Pancake Type) |
| Frame Size Class | GDM 120 Series |
| Armature Construction | Ironless, flat disc armature (zero cogging torque) |
| Commutator System | Carbon brushes with multi-segment planar commutator |
| Rated Speed | Up to 3,000 RPM (variant-dependent) |
| Inertia Characteristics | Extremely low rotor moment of inertia for rapid acceleration |
| Cooling Method | Convection / Natural air cooling (IC410 equivalent) |
| Protection Rating | IP44 / IP54 (depending on shaft seal integration) |
| Operating Temperature | -10 to +40°C |
| Mounting Style | Flange mount (IEC standard face dimensions) |
Product Introduction & Supply Chain Strategy
This product is a Brand New Surplus unit. It is not used, not pulled from a decommissioned plant, and not refurbished. All modules undergo rigorous quality verification to ensure OEM-level reliability. The Baumuller GDM120N-5280750 is a permanent magnet DC disc motor designed for high-dynamic industrial applications requiring flat form factors, rapid start-stop cycles, and zero-cogging positioning accuracy in robotics, printing presses, and medical automation.
Securing this specific model as New Surplus provides necessary supply-chain insurance for specialized machinery. Refurbished disc motors often suffer from worn commutator plates, thinned brush assemblies, and demagnetized permanent magnet segments caused by thermal overloads. A worn brush assembly or degraded disc armature can cause erratic torque output, brush sparking, and catastrophic motor stalling during acceleration phases. Sourcing verified New Surplus guarantees full commutator life, peak torque response, and exact mechanical drop-in security without risking machine performance on second-hand motors.
GDM120N-5280750
Installation & Configuration Guide
1.Pre-Installation (Prep & Safety):Isolate drive power and observe mechanical safety.
Execute Lock-Out/Tag-Out (LOTO) on the incoming DC motor drive power line. Wear grounded ESD wrist protection and protective eyewear. Take detailed photographs of the existing terminal box connections, cable entry points, tachometer/encoder connections, and mechanical mounting alignment.
2.Removal:Uncouple motor shaft and unbolt mounting flange.
Disconnect the armature power cables and feedback connections from the terminal strip. Decouple the motor shaft from the gear reducer or driven load. Remove the flange retaining bolts and carefully ease the motor straight out to avoid damaging the shaft extension or keyway.
3.Installation (Clone & Seat):Align mounting face and verify mechanical fit.
Inspect the mating machine flange and clean all mounting faces. Mount the new GDM120N-5280750 onto the flange, ensuring precise alignment of the motor shaft with the driven coupling. Tighten flange bolts evenly to specified torque values, and reconnect power leads observing proper polarity (+/-) for correct rotation direction.
4.Power-On & Testing:Check armature resistance and verify rotation under low voltage.
Measure armature resistance across terminals with a DMM to confirm circuit continuity. Apply a low DC test voltage to confirm shaft rotation and direction before full drive coupling. Reapply full power, verify smooth operation without excessive brush sparking, and check motor surface temperatures under initial load.
Firmware/Software Versions & Upgrade Notes
- Analog Motor Operation: The GDM120N-5280750 is a brushed DC motor that operates without internal digital firmware or embedded software.
- Drive Compatibility: Compatible with standard 4-quadrant DC servo drives and PWM amplifiers designed for permanent magnet DC motors.
- Feedback Integration: Ensure external tachometers or optical encoders mounted on the rear shaft extension match the pulse counts and signal levels configured in the DC drive parameters.
- Swap Warning: Always check motor armature voltage ratings and current limits in your DC controller before applying full power. Over-current conditions can overheat the thin disc armature, causing permanent thermal warping.
Frequently Asked Questions (FAQ)
Q: Is this Baumuller GDM120N motor brand new or reconditioned?
A: This unit is strictly New Surplus in its original factory packaging. It has never been mounted on a machine, used in production, or subjected to commutator turning or motor rewinding.
Q: Why choose New Surplus over a refurbished DC pancake motor?
A: Refurbished disc motors frequently retain thinned commutators and worn brushes that drastically reduce operational lifespan. Buying New Surplus ensures original copper thickness on the disc armature, full brush length, and optimal permanent magnet strength.
Q: Is the GDM series a mature/legacy line, and why should I stock a spare?
A: Yes, Baumuller GDM series disc motors are mature specialized components. Because factory lead times for disc motors can be extensive, stocking 1-2 New Surplus units in site buffer inventory prevents weeks of downtime if a motor fails on an operational line.
Q: What makes a disc armature motor different from a standard cylindrical DC motor?
A: Disc motors feature a flat, ironless rotor disc with zero cogging torque and extremely low rotor inertia. This design enables high acceleration rates, extremely smooth slow-speed rotation, and a short axial length (pancake shape) for tight mounting spaces.
Q: How do I change the rotation direction of the GDM120N motor?
A: Because the GDM120N is a permanent magnet DC motor, reversing the polarity of the DC voltage applied to the main armature terminals (+ and -) will reverse the direction of rotation.
Q: What warranty coverage applies to this module?
A: All New Surplus Baumuller motors include a full 1-year replacement warranty. If any functional defect occurs under standard operating conditions within 12 months of purchase, we replace the unit directly from our warehouse stock.
