A servo aging test is the reliability gate that every XQ-Power actuator passes before it is allowed to ship. Long before an RC airframe, an AGV steering module, or a robotic joint receives a drive unit, that unit has already been powered continuously, cycled through temperature extremes, shaken on three axes, and struck with controlled shock pulses. This article explains what the servo aging test program actually does, which parameters XQ-Power monitors, and how IEC-based vibration and shock testing expose the mechanical and electrical weaknesses that a datasheet never shows.
- Aging test — continuous powered aging at room temperature and under high/low-temperature cycling, plus long-duration continuous start/stop cycling.
- Monitored parameters — no-load and loaded current, positioning accuracy, return-to-center deviation, and jitter.
- Vibration test — sinusoidal vibration to IEC 60068-2-6, three axes tested separately, 10–2000 Hz.
- Shock test — half-sine shock pulses to IEC 60068-2-27, applied on multiple axes.
- Why it matters — early-life failures in motors, gear trains, and driver boards are screened out before shipment, so every delivered servo can be matched to RC, AGV, and robotics duty cycles.
What is aging test
A servo aging test is a time-compressed reliability procedure in which a servo is operated under controlled electrical and thermal stress until latent defects surface. Its purpose is not to prove that a servo works on day one — bench inspection already does that. Its purpose is to accelerate the infant-mortality region of the reliability curve, where weak solder joints, marginal motor windings, and imperfect gear meshing fail early, and to remove those units from the production batch.
XQ-Power runs the servo aging test in three stages, each targeting a different failure mechanism.
Stage 1 — Continuous Power-On Aging
Servos are powered continuously and held under load for an extended, uninterrupted period. Continuous operation raises internal temperature to a realistic steady state and exposes thermal weaknesses that a short functional check would miss — for example, a driver board that only misbehaves after it has been hot for several hours, or a motor that draws progressively more current as its brush or winding degrades.
Stage 2 — High- and Low-Temperature Cycling Aging
The same powered-aging routine is repeated inside a thermal chamber, cycling between high and low temperature limits. Temperature cycling produces differential expansion between the aluminium case, the steel or titanium gear train, the PCB, and the potting compound. That mechanical mismatch is what eventually opens a cold solder joint or cracks a gear tooth root — and it is far cheaper to find it in the chamber than in a customer’s robot.
Stage 3 — Long-Duration Continuous Start-Stop Aging
Rather than holding a static position, the servo is commanded through continuous start-stop cycles. Each start draws an inrush current, each stop produces a deceleration torque, and every reversal loads the gear train in the opposite direction. This stage validates sustained working stability — the behaviour that matters most in an AGV that steers hundreds of times per shift or a robotic arm that cycles continuously on a production line.
What XQ-Power Monitors During the Servo Aging Test
Monitoring continues throughout the aging window, so a unit is judged on its trend, not just its final state.
| Monitored parameter | How it is measured | Failure signal |
|---|---|---|
| No-load current | Current draw with the output shaft free | Rising trend indicates friction, gear wear, or winding degradation |
| Loaded current | Current draw against a defined load | Excessive current means the drive is compensating for mechanical loss |
| Positioning accuracy | Commanded angle vs. achieved angle | Growing error indicates encoder or gear-train degradation |
| Return-to-center deviation | Repeat commands to the neutral position | Drift points to backlash or sensor zero-shift |
| Jitter | High-resolution observation of a held position | Oscillation reveals control-loop or sensor noise |
When any parameter moves outside its acceptance band during the servo aging test, the unit is set aside. This is the same philosophy behind the published 2,000-hour industrial life test — long-duration data, not a single pass/fail reading.
Servo Vibration Testing to IEC 60068-2-6
Vibration is the stress that reaches a servo through the frame it is bolted to: an aeroelastic airframe, a rough-terrain AGV chassis, or a robot that lands hard on every cycle. XQ-Power evaluates this with a sinusoidal vibration test following IEC 60068-2-6 (“Environmental testing – Part 2-6: Tests – Test Fc: Vibration (sinusoidal)”), the IEC standard that defines how a specimen is swept through a frequency range and endorsed to a specified severity. See the IEC 60068-2-6:2007 publication page for the standard’s formal scope.
How the Vibration Test Is Run
- Sinusoidal excitation. The servo is driven with a controlled sine waveform, which is deterministic and therefore easy to correlate with a specific resonance.
- Three axes, tested separately. The unit is mounted and vibrated along each of the three orthogonal axes in turn. Testing the axes separately prevents the masking effect that a combined-axis sweep can create.
- Frequency range of 10–2000 Hz. The sweep spans the range where structural resonances of small mechanisms are typically found — from low-frequency chassis motion up to the higher-frequency response of a lightweight servo case and PCB.
- Acceleration set by product specification. Rather than applying one severity to every model, the acceleration level is set from the servo’s own specification and intended application.
- Defined duration. The sweep is repeated for a specified endurance period to accumulate fatigue cycles rather than produce a single shock.
Post-Vibration Inspection Checklist
After the sweep, the servo is inspected rather than simply returned to stock:
- Housing — no cracks, loosened fasteners, or distorted mounting ears.
- Gear train — no abnormal backlash, tooth marking, or debris.
- PCB solder joints — no hairline cracks at component leads or connector pins.
- Function — the servo still tracks commands, holds position, and meets its rated speed and torque.
Servo Shock Testing to IEC 60068-2-27
Where vibration delivers fatigue, shock delivers instantaneous peak load. XQ-Power tests this with a half-sine shock pulse to IEC 60068-2-27 (“Environmental testing – Part 2-27: Tests – Test Ea and guidance: Shock”), the IEC procedure for non-repetitive and repetitive shocks that can reveal accumulated damage or structural degradation. The IEC 60068-2-27:2008 publication page describes the standard procedure in full.
How the Shock Test Is Run
- Half-sine pulse. A half-sine waveform is the conventional pulse shape for reproducing drop and impact events — a single, clean acceleration peak followed by a return to rest.
- Multi-axis application. Shock is applied along multiple axes so that the mechanical structure is loaded from more than one direction, reflecting the unpredictable orientation of a real impact.
- Peak and duration set by torque class. The shock peak acceleration and pulse duration are set according to the model’s torque class. A heavier, high-torque servo carries more inertia and therefore sees different internal loading than a lightweight micro servo, so a single universal severity would be meaningless.
- Scenario mapping. The chosen severity reproduces the two events that dominate field failures: a drop during handling or installation, and a sudden load release or collision during operation.
Post-Shock Inspection Checklist
After the shock sequence, every unit is checked for the failure modes that shock uniquely produces:
- Mechanical structure — no chipped or fractured gear teeth, no cracked case, no deformed output shaft.
- Internal wiring — no de-soldered joints, no detached connectors, no broken lead wires.
- Performance — torque output and response speed still meet specification, and positioning accuracy is unchanged.
Why Aging, Vibration, and Shock Testing Matter for RC, AGV, and Robotics
Each application stresses a servo differently, which is exactly why XQ-Power runs all three test types rather than a single generic screen. The table below maps the dominant field stress to the test that reproduces it.
| Application | Dominant field stress | Test that reproduces it |
|---|---|---|
| RC aircraft / UAV control surfaces | Continuous small-amplitude vibration, occasional hard landing | IEC 60068-2-6 vibration + IEC 60068-2-27 shock |
| AGV steering and drive | Thousands of start-stop cycles, chassis vibration | Continuous start-stop aging + vibration |
| Robotic joints / robotic arms | Cyclic load reversal, thermal build-up | Loaded aging + temperature cycling |
| Handheld / compact devices | Drop impact | IEC 60068-2-27 shock |
| Long-dwell valve or positioning actuators | Sustained holding, minimal motion | Continuous power-on aging |
Testing to a published standard, rather than to an internal checklist alone, also gives integrators something they can trace. A design engineer specifying a high-torque servo for an AGV or robotic joint can point to IEC 60068-2-6 and IEC 60068-2-27 as the reference conditions and compare them against their own environmental requirements.
From Test Data to Model Selection
Test results are only useful if they inform the choice of a specific servo. Once a unit has cleared the servo aging test, the vibration test, and the shock test, its verified behaviour can be matched to a duty cycle:
- High-load, continuous-duty applications — start with the high-torque servo range and the brushless servo motor range, where the reliability work is aligned to sustained industrial operation.
- Robotic and multi-joint systems — the smart robot servo and smart serial bus servo families are designed for networked, repeatedly commanded motion.
- Compact and lightweight assemblies — the micro servo range and coreless servo motor range carry the same qualification discipline at a smaller scale.
- Project context — the broader reliability and validation approach is described in XQ-Power’s engineering capabilities hub and the practical application notes in the servo motor technical guide.
For teams that need to validate a specific duty cycle — a shock peak above the standard envelope, an unusual thermal profile, or a bespoke start-stop count — XQ-Power’s engineering team can review the requirement against a standard model or an OEM/ODM configuration. Start from the contact page or read more about XQ-Power.
Frequently Asked Questions (FAQ)
A servo aging test is a reliability procedure that operates a servo continuously under controlled electrical and thermal stress to accelerate early-life failures. XQ-Power applies three stages: continuous power-on aging at room temperature, high- and low-temperature cycling aging, and long-duration continuous start-stop aging.
The test monitors no-load and loaded current, positioning accuracy, return-to-center deviation, and jitter. Any parameter drifting outside its acceptance band during the aging window marks the unit as a suspect, which allows motor, gear, and driver-board early failures to be screened out.
Vibration testing follows IEC 60068-2-6, sinusoidal vibration, with each of the three axes tested separately across a 10–2000 Hz frequency range. The acceleration level and endurance duration are set from the individual product specification.
Shock testing follows IEC 60068-2-27, using a half-sine pulse applied along multiple axes. The shock peak and pulse duration are set according to the model’s torque class to reproduce drop and sudden-load events.
After vibration, XQ-Power checks the housing, gear train, and PCB solder joints for loosening or cracking, and confirms the servo still meets its functional specification. After shock, the checks focus on broken gear teeth, internal wiring and solder integrity, and whether torque and response speed remain within specification.
Aging, vibration, and shock each trigger different failure mechanisms. Aging exposes thermal and wear-related degradation; vibration exposes fatigue in housings, gears, and solder joints; shock exposes instantaneous structural and electrical damage. Running all three is what allows a shipped servo to be matched confidently to RC, AGV, and robotics duty cycles.
Conclusion
A datasheet tells you what a servo can do once. A servo aging test, a sinusoidal vibration test to IEC 60068-2-6, and a half-sine shock test to IEC 60068-2-27 tell you what it will still do after thousands of cycles, a few temperature swings, and a hard landing. XQ-Power applies all three, re-verifies basic performance on every unit after testing, and rejects anything that falls outside specification — so the servo that reaches an RC model, an AGV, or a robot has already survived the conditions that would have retired a lesser unit.
Ready to specify a servo that has earned its reliability data? Contact the XQ-Power engineering team with your torque, voltage, duty cycle, and environment, and we will recommend the right model or an OEM/ODM configuration.