Strict Control of Quietness Quality | ETONM MOTOR Establishes Standardized NVH Testing System, Further Enhancing the Acoustic Performance of Micro Gear Motors

12 Aug,2026

ETONM MOTOR has recently finalized an integrated NVH (Noise, Vibration, and Harshness) testing system for its micro DC gear motors. Equipped with soundproof testing chambers, high-precision acoustic data acquisition equipment, and intelligent spectrum analysis systems, the company has established a comprehensive control mechanism—spanning R&D finalization and sample validation to 100% noise screening of finished products on the production line. By replacing traditional subjective human listening with quantitative acoustic data, ETONM MOTOR continues to provide low-noise, stable micro-drive solutions to downstream clients with rigorous quietness requirements, such as those in smart locks, smart sanitary ware, medical equipment, small robots, and electric valves.

Micro DC gear motors are widely used in end-user products, where abnormal sounds from gear meshing, bearing noise, or electromagnetic noise directly impact the user experience. For a long time, many manufacturers in the industry relied on the subjective hearing of quality inspectors; such standards were easily influenced by the environment or the inspector's condition, leading to missed detections of faint or intermittent abnormal sounds and making it difficult to meet the supply standards of clients requiring high levels of quietness, such as those in the medical and smart home sectors. To address this industry pain point, ETONM MOTOR leveraged the specific characteristics of its Φ8–Φ51mm DC gear motors (planetary, spur, and worm gear types) to build a standardized acoustic testing environment and a digitalized inspection process. By benchmarking against the GB/T 10069.1 standard for noise determination in rotating electrical machines, the company established its own internal control standards, achieving noise testing that is digitalized, reproducible, and traceable.

In ETONM MOTOR’s testing laboratory, the soundproof chamber maintains a consistently low background noise environment, eliminating interference from external equipment or ambient noise. The testing process covers multiple operating conditions—including no-load, rated load, and various voltage/speed settings. High-precision microphones capture A-weighted sound pressure level data at fixed distances, while vibration signals are simultaneously acquired and subjected to FFT spectrum analysis. This allows for the precise differentiation of noise sources—such as gear friction, bearings, or electromagnetics—enabling the system not only to read total decibel values ​​but also to pinpoint abnormal frequency points, thereby rapidly guiding R&D teams in optimizing magnetic circuits, gear modules, lubrication schemes, and assembly processes. An in-line noise screening station is deployed alongside the fully automated assembly line. Upon completion, every finished motor automatically enters the acoustic testing stage, where the system—using model-specific noise thresholds and anomaly characteristic profiles—automatically determines pass/fail status and rejects defective units. This eliminates the subjectivity associated with manual listening and enables the automated detection of abnormal sounds, extraneous noise, and intermittent acoustic anomalies. Test data is synchronized with the Manufacturing Execution System (MES) and linked to product serial numbers for archiving; customers can retrieve acoustic test records as needed to meet requirements for incoming material audits and quality traceability.

Leveraging this standardized noise testing system, ETONM Motor can optimize noise performance to meet specific customer needs. The company develops low-noise, customized gear motors for applications such as smart bathroom fixtures, medical actuators, and smart security locks; while maintaining torque and service life, these motors feature optimized gear lubrication and dynamic balancing to minimize transmission noise. Furthermore, noise benchmarking can be performed during the initial sampling phase to lock in acoustic specifications early, thereby shortening the customer's system-level debugging cycle and enhancing the end-user experience.

A ETONM Motor representative stated: "Although micro-motors are small, the quietness of operation is a critical factor in the competitiveness of the end product. We established a professional NVH (Noise, Vibration, and Harshness) testing system with the core objective of transforming 'auditory perception' into reliable, stable, and quantitative data, allowing us to manage the risk of abnormal noise across the entire value chain—from R&D and manufacturing processes to mass production." Looking ahead, Yitongda will continue to deepen its R&D into low-noise micro DC gear motors, refine acoustic simulation and in-line detection algorithms, and expand its portfolio of quiet motor products.

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