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3. Key Technical Specifications
| Parameter | Value (typical) |
|---|---|
| Frame Size | 90 mm |
| Continuous Stall Torque | Approx. 10 Nm |
| Rated Speed | 2000 rpm |
| Rated Bus Voltage | 300–320 VDC |
| Continuous Current | Approx. 6 A RMS (model dependent) |
| Peak Current | Significantly higher (typically 3–4× continuous) |
| Feedback | Resolver (AA suffix) |
| Inertia | Medium (A-series) |
| Protection | IP54 |
| Insulation Class | F |
| Mounting | Flange |
| Typical Weight | Approx. 5.5–14.5 lb (depending on exact length variant) |
| Poles | 8 |
Exact current, power, and length values should be confirmed against the motor nameplate, as minor variations exist within the BSM90 family.
4. Product Introduction
The Baldor BSM90A-2150AA is a medium-inertia brushless AC servo motor from the BSM A-series. It delivers approximately 10 Nm continuous stall torque at a 2000 rpm base speed and is designed for use with 300 VDC class servo drives.
This motor is commonly applied in packaging, material handling, machine tools, and general automation where reliable closed-loop performance and resolver feedback are required. The A-series design provides a good balance of torque, inertia, and size for medium-duty positioning and velocity applications.
BSM90A-2150AA
BSM90A-2150AA
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| Motor does not turn | Drive enable off, power loss, or feedback fault | ✅ High | Verify drive status, bus voltage, and resolver signals | Confirm drive and feedback connections first |
| Over-current or drive fault | Mechanical bind or winding short | ✅ High | Check for free rotation; measure winding resistance | Clear mechanical issues; replace motor if shorted |
| Position error or hunting | Feedback or tuning problem | ✅ High | Inspect resolver cable and shielding | Repair feedback wiring; re-tune drive |
| Over-temperature | Overload or poor heat dissipation | ✅ Medium | Monitor current and motor surface temperature | Reduce load or improve cooling |
| Noisy operation | Bearing wear or misalignment | ✅ Medium | Listen and feel for vibration | Replace motor if bearings are failing |
If the problem continues, record drive fault codes, bus voltage, current, and feedback status, then contact technical support with the information.
6. Frequently Asked Questions (FAQ)
Q: Is the BSM90A-2150AA still in production?
A: Availability is limited. New-surplus and fully tested refurbished units are the common supply path for maintaining existing systems.
Q: What does the “AA” suffix indicate?
A: It typically denotes resolver feedback. Confirm the exact feedback type on the nameplate or by connector inspection.
Q: What drive is compatible?
A: It is designed for Baldor / ABB servo drives that support the BSM series (300 VDC bus class). Confirm continuous and peak current ratings match the drive.
Q: Can it be used with a gearbox?
A: Yes. Matching planetary gearheads (GBSM series) are available for the BSM90 flange.
Q: What is the difference between A-series and B-series or N-series?
A: A-series is medium inertia. B-series and N-series have different inertia and magnet technology options. Match the series to the original motor for best performance.
Q: Does it include a holding brake?
A: The base BSM90A-2150AA typically does not. Brake versions exist with different suffixes. Check the nameplate.
Q: Why choose a tested refurbished unit?
A: These servo motors are frequently used in production equipment. Fully tested units restore performance quickly while carrying a warranty, avoiding long lead times for scarce new stock.
