Description
Core Product Summary
The Baumüller GDM 120N-528/0750 is a compact, high-dynamics permanent-magnet DC disc servo motor engineered for precise industrial motion control. Manufactured by Baumüller (and commonly referenced across industrial automation databases), this unit features an ironless rotor structure combined with a drum-type commutator. Its flat, “pancake” construction is specifically designed for space-constrained machine layouts requiring high torque density and low axial depth.
Operating on a 24 VDC nominal supply, the GDM 120N-528/0750 utilizes high-energy NdFeB permanent magnets to deliver smooth, detent-free rotation with minimal torque ripple. The coreless armature design virtually eliminates cogging torque, providing precise velocity control and rapid dynamic acceleration/deceleration response. Built in a robust IP44 enclosure with standard IM B14 mounting geometry, the motor is well-suited for robotics, positioning stages, automated feed drives, and industrial machinery where low inertia and slim axial installation space are paramount.
Key Technical Specifications
| Specification Parameter | Verified Value |
| Manufacturer | Baumüller |
| Product Model | GDM 120N-528/0750 |
| Motor Type | Coreless Permanent-Magnet DC Disc Servo Motor (Pancake Motor) |
| Nominal Operating Voltage | 24 VDC |
| Rated Continuous Current | 8.6 A |
| Rated Output Power | 150 W |
| Rated Rotational Speed | 2050 RPM |
| Rated Output Torque | 70 N·cm (0.7 Nm) |
| Armature / Rotor Type | Ironless (Coreless) Disc Rotor with Drum Commutator |
| Magnet Type | Neodymium-Iron-Boron (NdFeB) Permanent Magnets |
| Ingress Protection Rating | IP44 (Per IEC Standards) |
| Cooling Method | IC410 (Natural Air Convection) |
| Mounting Flange Standard | IM B14 Flange Mount |
| Outer Diameter | 120 mm |
| Axial Thickness / Depth | ~42 mm |
| Net Weight | ~4.5 kg |
| Operating Ambient Temperature | -20°C to +40°C |
Detailed Product Overview
The Baumüller GDM 120N-528/0750 disc motor addresses strict spatial and dynamic requirements in modern automation. Unlike conventional cylindrical DC motors, the GDM series employs a flat disc-shaped armature. By utilizing a coreless (ironless) winding arrangement, iron losses are reduced and cogging (detent torque) is eliminated. This allows the motor to maintain consistent, smooth torque output from near-zero speeds up to rated operational RPM.
The combination of low electrical inductance and an ironless rotor yields an extremely low moment of inertia. This high torque-to-inertia ratio enables high dynamic performance during rapid start-stop cycles, reversal operations, and precise velocity tracking. The drum-shaped commutator and optimized wire wrap reduce carbon brush wear, extending maintenance intervals under continuous industrial duty.
In automated machinery systems, the GDM 120N-528/0750 serves as a compact direct drive or geared servo actuator. Its slim axial profile allows mounting directly against gearboxes, feed mechanisms, or structural machine frames where standard long-body motor enclosures cannot fit.
GDM 120N-528/0750
System Compatibility & Integration Requirements
| Item / Dependency | Verified Compatibility or Requirement | Practical Note |
| Power Drive Source | 24 VDC Regulated Power Supply / DC Servo Controller | Requires a DC servo amplifier rated for continuous current of 8.6 A or higher. |
| Mounting Interface | IM B14 Flange Mount | Matches standard B14 face-mounting bolt patterns for 120 mm frame sizes. |
| Feedback Options | Compatible with optional tachometers, encoders, or resolvers | Feedback units can be integrated depending on closed-loop positioning requirements. |
| Gearhead Integration | Compatible with inline spur or planetary gearboxes | Designed for direct coupling to low-backlash speed reducers. |
| Environmental Protection | IP44 Enclosure | Suitable for general industrial environments; requires secondary housing for liquid-washdown areas. |
Dimensions, Mounting & Connection Notes
- Outer Diameter: 120 mm outer housing diameter.
- Axial Depth: Approximately 42 mm overall axial body length.
- Weight: Approximately 4.5 kg.
- Mounting Pattern: Standard IM B14 flange configuration for face-mounting.
- Cooling: Natural convection cooling (IC410 mode); ensure adequate surrounding airflow to maintain thermal limits under heavy continuous duty.
- Operating Ambient Temperature: -20°C to +40°C under normal operational conditions.
FAQ
What type of motor is the Baumüller GDM 120N-528/0750?
It is a coreless (ironless rotor) permanent-magnet DC disc servo motor designed for high dynamics and low axial mounting depth.
What is the nominal supply voltage for the GDM 120N-528/0750?
The motor operates on a nominal supply voltage of 24 VDC.
What power and torque output does this motor provide?
The motor provides a rated output power of 150 W and a nominal output torque of 70 N·cm (0.7 Nm) at 2050 RPM.
Why is a coreless disc rotor beneficial for motion control?
A coreless disc rotor eliminates cogging torque, significantly lowers rotor inertia, and delivers smooth, ripple-free torque output across the entire speed range.
What is the mounting flange specification?
The motor uses a standard IM B14 flange mounting pattern with a 120 mm body diameter and roughly 42 mm axial thickness.
What ingress protection rating does the enclosure have?
The unit features an IP44 rating according to IEC standards, protecting against solid objects larger than 1 mm and water splashing from any direction.
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