Dunkermotoren GR 63 25 40V motor

Dunkermotoren GR 63×25 Brushed DC motor assembly, manufactured by Dunkermotoren.

  • GR 63×25 40V motor
  • Worm gearbox SG80K
  • Encoder RE20S
  • Gear ratio 15:1
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Dunkermotoren GR 63 25 40V motor

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Dunkermotoren GR 63 25 40V motor

Dunkermotoren GR 63 25 40V motor

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DESCRIPTION

Dunkermotoren Brushed DC motor GR 63 25 40V for Dorma ES200e operator

Dunkermotoren, part of Ametek Germany, has been designing and manufacturing high-precision motors for over 50 years. Their motors are renowned for their power and long-lasting durability. With decades of expertise, we place our trust in their products and exclusively use original Dunkermotoren motors as the driving force in our automatic door systems.

The motors in the ES200e automatic sliding door opener/operator are Dunkermotoren's brushed DC motors, known for their low cogging torque, robust construction, and minimal inertia. These motors are identical to those used in the Dorma ES200e automatic door system.

Module combination: Motor GR 63x25 40V, Worm Gearbox SG80, Encoder RE20

  • Operation in both directions of rotation
  • Ball bearing at motor output shaft is standard
  • A Optionally with deviant shaft length and diameter, shaft on both sides, special and high voltage winding, higher protection class up
  • Nominal voltage V 40
  • Nominal speed rpm 3500

Dunkermotoren is based in Bonndorf im Schwarzwald (Baden-Württemberg), where it stands as the largest employer in the city. The motors supplied to the Chinese market are produced at Dunkermotoren’s facility in Taicang, China. Any Dunkermotoren motors purchased in China will be labeled as 'Made in China' rather than 'Bonndorf Germany.

LOCATIONS Taicang, China

Proof Letter From Dunkermotoren – Ametek

Key Specifications

  • Product Name: Dunkermotoren GR 63×25 Brushed DC Motor (40-V class) for precision motion and compact sliding-door headers.

  • Series Context (comparison): Closely related dunkermotoren GR 63×55 variant provides higher continuous power (~95–100 W class) and torque for heavier doors.

  • Voltage Options (typical): 12 / 24 / 40 / 60 V windings; 40 V curves commonly used for ES-class automatic doors .

  • Nominal Output (typical): ~50 W continuous, ~119 W peak (GR 63×25); ~95–100 W nominal (GR 63×55).

  • Nominal Speed (typical): ~3,300–3,450 rpm across 40-V builds.

  • Nominal Torque (typical): ~14 N·cm (GR 63×25) vs. ~27 N·cm (GR 63×55).

  • Load Capability (drawing data): Up to 150 N radial / 150 N axial for GR 63×25 standard output shaft.

  • Protection: GR series configurable up to IP65 with appropriate sealing.

  • Mechanical Envelope: Ø63-mm frame; compact 25-mm lamination stack length; face-mount pattern per series drawings.

  • Common Module Pairing: SG80 worm gearbox + RE20 incremental encoder for sliding-door operators; identical pairing widely listed for ES-series sets.

  • Application Fit: GR 63×25 suits compact headers / moderate leaf mass; GR 63×55 suits heavier leaves / high duty.

FAQ

Q1. What’s the difference between GR63x25 and dunkermotoren GR 63x55?
A. Both are 63-mm brushed DC motors. GR 63×25 uses a shorter stack for compact headers and delivers ~50 W continuous, ~14 N·cm nominal torque. GR 63×55 uses a longer stack to reach ~95–100 W class and ~27 N·cm nominal torque for heavier sliding doors.

Q2. Is the GR 63×25 a direct replacement for every ES-series operator?
A. Not always. Many ES200/ES200e configurations use GR 63×25 with SG80 + RE20; heavier Dorma ES200 sets often specify GR 63×55. Check your nameplate and module combination before ordering.

Q3. What speed range should I expect at 40 V?
A. Manufacturer and distributor curves show ~3,300–3,450 rpm nominal for 40-V windings, which, when geared through SG80, supports typical door tip speeds.

Q4. Does the motor support higher ingress protection?
A. Yes. GR series brushed DC motors are configurable up to IP65; confirm your exact build code for sealing options.

Q5. Can I reuse my current gearbox and encoder?
A. Often yes. ES-series drives are supplied as motor + SG80 worm gearbox + RE20 encoder modules. If your controller, gear ratio, and encoder type match, the module swaps with minimal rework.

Q6. How do I decide between GR 63×25 and GR 63×55 for a retrofit?
A. Use GR 63×25 when header space is tight and door mass is moderate. Choose GR 63×55 when the door leaves are heavier, cycle counts are high, or you need more torque margin for adverse conditions.

Q7. Are there official performance curves to validate my selection?
A. Yes—published characteristic diagrams show torque–speed/current–speed curves for GR 63×25 at 40 V, enabling precise engineering checks.

Q8. What radial/axial loads can the output shaft tolerate?
A. Representative GR 63×25 drawings list up to 150 N radial and 150 N axial loads; verify against your pulley/belt forces and mounting.

Q9. Any maintenance benefits over older door motors?
A. The GR series emphasizes reliable thermal behavior, robust bearings, and low cogging; recent design updates improved thermal management and corrosion resistance for longer service life.

Product Description

The Dunkermotoren GR 63×25 is a compact, industrial-grade brushed DC motor engineered for smooth, controllable motion in tight spaces—exactly what modern sliding-door headers demand. With a 63-mm frame and a short 25-mm lamination stack, it delivers ~50 W continuous and peaks above 100 W, providing brisk acceleration and reliable speed holding without the bulk of longer stacks. In automatic doors, it’s commonly paired with an SG80 worm gearbox and RE20 incremental encoder so the controller can execute soft-start/soft-stop profiles, maintain repeatable open/close times, and comply with force-limit expectations.

Where applications push into heavier leaf masses, the closely related dunkermotoren GR 63×55 steps in with a longer magnetic stack, raising nominal torque to about 27 N·cm and nominal power into the ~95–100 W class—ideal for Dorma ES200-class operators and high-duty entrances. Together, GR63x25 and GR63x55 give specifiers a clear, scalable path: pick the compact motor for space-constrained headers and moderate weights, or step up to the longer stack when additional torque margin and duty-cycle headroom are critical.

Power-to-size that makes commissioning easy

At 40 V, GR 63×25’s characteristic curves show ~3,300 rpm nominal speed with smooth torque delivery. That predictable behavior simplifies gearbox ratio selection and lets integrators hit door tip speeds consistently across seasons and pressure differentials. Because the GR platform exhibits low mechanical time constant and low cogging, doors start cleanly, track straight, and stop repeatably—reducing nuisance reversals and callbacks.

Built for long service life in busy entrances

The GR series has decades of field history in building automation. Its robust bearings, magnetic design, and revised corrosion/thermal management (announced for the series) support reliable service in malls, hospitals, transit nodes, and corporate lobbies. With IP65 configurations available, the motor tolerates dust and incidental moisture when correctly specified—useful for semi-exposed headers or environments with frequent cleaning aerosols.

Integration that respects your existing hardware

Most ES-series headers use standardized module footprints. If your current label lists GR 63×25 40 V and the module includes SG80 + RE20, you can typically swap like-for-like and be back online quickly after a controller learn cycle. If your installed label reads GR 63×55 or your door mass has increased (e.g., laminated or thicker glass), the higher-power motor is the prudent choice to preserve acceleration ramps and stopping accuracy.

Engineering checkpoints before you order

  1. Nameplate verification: Confirm motor type and voltage (GR 63×25 40 V vs. GR 63×55).

  2. Module mapping: Note gearbox model (SG80) and encoder (RE20); verify gear ratio and encoder resolution/settings against your controller.

  3. Load math: Cross-check leaf mass, friction, and desired door speed against the 40-V torque–speed curve.

  4. Shaft & load: Ensure your drive pulley loads sit within 150 N radial/axial limits.

  5. Environment: Specify IP65 sealing where cleaning agents, dust, or moisture are present.

What professionals appreciate most

  • Scalable platform: Choose GR63x25 for compact headers; step to dunkermotoren gr 63x55 when duty or mass rises.

  • Predictable commissioning: Smooth curves and low cogging let controllers learn distances, ramps, and stop points quickly.

  • Module standardization: The SG80 + RE20 pairing enables drop-in maintenance across large estates.

  • Long-term reliability: Updated GR series thermal and corrosion features support multi-year service intervals.

If your specification calls for a compact, dependable 40-V PMDC motor for a modern sliding-door header, GR 63×25 is the efficiency-first choice. When the opening gets heavier or cycle counts rise, the compatible GR 63×55 provides the torque headroom to keep doors gliding quietly and stopping precisely—day after day.

References

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