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“How many hours before this servo motor needs attention?” is a fair question, and the honest answer only exists if it comes from the manufacturer’s own manual — not from a guess based on how the motor sounds today. Below are the verified service-life intervals published by Yaskawa and Panasonic for two current servo families, exactly as documented, with the source for each figure.
This is reference data, not a diagnosis. Actual life depends heavily on your operating conditions and environment — these are the manufacturer’s own baseline figures for planning, not a guarantee.
Yaskawa Sigma-7 (SGM7x) — verified component life
Source: Yaskawa Sigma-7 Series AC Servo Drive Rotary Servomotor Product Manual (SIEPS80000136D), Chapter 10 — Service Lives of Parts.
| Component | Standard service life | What to check |
|---|---|---|
| Bearing | 20,000 hours | Abnormal sounds and vibration during inspections |
| Holding Brake (if fitted) | 20,000 hours | Brake releases when power is supplied; changes in operating time |
| Oil Seal | 5,000 hours (replace at least once every 5,000 hours) | Oil leaks during inspections |
Yaskawa’s manual also specifies a calendar-based check independent of run hours: measure insulation resistance at least once a year at 500V. A reading of 10 MOhm or higher is normal; below that, the manual directs you to contact a Yaskawa representative.
Panasonic MINAS A6 (MSMF/MSMD/MSME) — verified component life
Source: Panasonic MINAS A6 Series AC Servo Motor & Driver Operating Instructions, Maintenance and Inspections / Replacement Guidance (p.72). Panasonic’s reference cycles assume ambient 30°C annual average, load factor up to 80%, and operating hours up to 20 per day — different conditions will shift these figures.
| Component | Standard replacement cycle | Notes |
|---|---|---|
| Bearing | 3–5 years (20,000–30,000 hours; lower bound used for planning) | Replace defective parts immediately regardless of the cycle |
| Oil Seal | 5,000 hours | — |
| Encoder | 3–5 years (20,000–30,000 hours; lower bound used for planning) | Dismantling should be done by the manufacturer or sales agents |
| Battery (Absolute Encoder) | 1 year from first use | Calendar-based, not hours-based |
| Cooling Fan (driver) | 2–3 years (10,000–30,000 hours; lower bound used for planning) | Applies to driver models fitted with a cooling fan |
| Smoothing Condenser (driver) | ~5 years | Calendar-based guidance |
| PCB Electrolytic Capacitor (driver) | ~5 years | Calendar-based guidance |
How to use these numbers without guessing
Two figures matter for any component: your actual accumulated run hours (or years in service, for calendar-based items), and the verified reference figure above. The ratio between the two tells you where you stand — well below the reference, approaching it, or at/beyond it. That is exactly the calculation our free Servo Health Check tool runs automatically once you enter your motor’s brand, model, and usage — it currently supports this same Yaskawa Sigma-7 and Panasonic MINAS A6 dataset, sourced from the same manuals cited above.
If you don’t know your accumulated run hours, the tool (and this data) still gives you a calendar-based read using years in service for the components that are governed by a calendar cycle rather than hours — nothing here fabricates a run-hours figure you haven’t provided.
Servo life-interval questions, answered
How many hours does a Yaskawa Sigma-7 servo motor bearing last?
20,000 hours standard service life, per Yaskawa’s own product manual (SIEPS80000136D) — affected by your actual operating conditions, and the manual recommends checking for abnormal sounds and vibration during inspections regardless of the hour count.
When should I replace the oil seal on a Panasonic MINAS A6 servo motor?
Panasonic’s manual specifies a 5,000-hour standard replacement cycle for the oil seal.
What if I don’t track operating hours?
Use the calendar-based components (insulation check, battery, condensers) as your planning anchor, and start logging hours going forward — the hours-based figures above cannot be responsibly estimated without real usage data.
Check your own motor against this data
Enter your brand, model, and usage into the free Servo Health Check tool for an instant read against these verified intervals, or send your nameplate details to Ask Star for a maintenance review.