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3. Key Technical Specifications
| Parameter | Value (typical 24 V version) |
|---|---|
| Frame Size | 65 mm |
| Motor Length | Approx. 50 mm (body) |
| Nominal Voltage | 24 V DC |
| Nominal Current | 5.2 – 5.6 A |
| Nominal Torque | 26 Ncm (0.26 Nm) |
| Nominal Speed | 2950 – 3100 rpm |
| Nominal Power | 80 – 100 W |
| No-Load Speed | Approx. 5590 – 6150 rpm |
| Stall Torque | Up to ~163 Ncm (limited by electronics) |
| Controller | Integrated SI 4-quadrant speed controller |
| Feedback | Hall sensors (standard); encoder options available |
| Protection | IP54 / IP65 (depending on connector version) |
| Weight | Approx. 1.3 – 1.43 kg |
| Temperature Range | –20 °C to +60/100 °C (depending on version) |
4. Product Introduction
The Dunkermotoren BG65X50SI is a 65 mm frame brushless DC motor with an integrated SI 4-quadrant speed controller. It combines a high-efficiency BLDC motor and electronics in one compact package, eliminating the need for a separate drive in many applications.
This motor is widely used in automation, packaging, medical equipment, and material handling where compact size, long life, and simple speed control are required. The integrated controller accepts analog (0–10 V) or digital commands for direction, start/stop, and speed, making it a straightforward drop-in replacement for existing BG65 SI installations.
BG65X50SI
BG65X50SI
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| Motor does not run | No power, Enable signal missing, or controller fault | ✅ High | Verify 24 V supply and control inputs | Confirm power and command signals first |
| Runs only in one direction | Direction input or wiring issue | ✅ High | Check digital direction input and polarity | Correct input wiring or configuration |
| Speed unstable or hunts | Load variation or feedback problem | ✅ Medium | Check mechanical load and Hall sensor signals | Inspect coupling and feedback connections |
| Over-temperature shutdown | Overload or poor heat dissipation | ✅ High | Measure current; check mounting surface | Reduce load or improve thermal path |
| No response to analog speed command | Signal level or wiring error | ✅ High | Measure 0–10 V input at the connector | Verify analog signal integrity |
If the problem continues, record supply voltage, current draw, and control signal states, then contact technical support with the information.
6. Frequently Asked Questions (FAQ)
Q: Is the BG65X50SI still in production?
A: Availability varies by exact configuration. New-surplus and fully tested refurbished units remain common for legacy systems.
Q: What does the “SI” suffix mean?
A: SI indicates the integrated 4-quadrant speed controller version. The motor includes onboard electronics for speed and direction control.
Q: What voltage versions are available?
A: The most common is 24 V DC. Other voltages (e.g., 42 V) exist in the BG65 SI family. Confirm the nameplate voltage before installation.
Q: Does it require an external servo drive?
A: No. The SI version has the speed controller built in. It only needs a suitable DC power supply and control signals (analog or digital).
Q: Can it be combined with a gearbox?
A: Yes. Dunkermotoren offers matching planetary and right-angle gearboxes (e.g., PLG, SG series) that mount directly to the BG65 flange.
Q: What feedback is included?
A: Standard Hall sensors for commutation. Some versions include an incremental encoder. Check the specific unit or order code for encoder details.
Q: Why choose a tested refurbished unit?
A: These compact BLDC motors with integrated electronics are frequently used in production equipment. Fully tested units restore performance quickly while carrying a warranty, avoiding long lead times for scarce new stock.
