Ono Sokki

Automotive electric motors
EV motors
EV drive units
Brushless motors
Office automation (OA) equipment
Audio-visual (AV) equipment
Home appliances
Wind power generation systems
Industrial Robots / Service Robots

In recent years, the rapid advancement of electrification has led to increasingly sophisticated performance demands for motors.
These motors are expected to deliver high efficiency while minimizing noise and vibration.
In the development of such motors, in addition to evaluating basic characteristics, it is essential to measure factors such as efficiency, cogging torque, and torque ripple, which can cause noise and vibration.
Our motor testing systems contribute to the development of high-performance motors by accurately capturing motor behavior for precise evaluation.

Using Ono Sokki’s proprietary phase difference method, we have achieved high-precision and highly reproducible torque measurement across a wide rotational speed range—from low to high speeds.
Building on this technology, we offer systems capable of comprehensive measurement and evaluation of various performance characteristics, including the torque characteristics of small AC/DC motors.
Our products also feature enhanced torsional rigidity, enabling precise detection of subtle torque fluctuations.
They support the measurement of critical parameters such as "torque ripple" and "cogging torque," which are essential for improving motor efficiency and reducing noise, thereby providing strong support for motor development.
Furthermore, we offer motor testing systems for evaluating basic characteristics in a wide range of applications, including motors for HEV/EV, electric power steering (EPS), compressors, robotics, and household appliances such as vacuum cleaners and washing machines.

Automotive electric motors
EV motors
EV drive units
Brushless motors
Office automation (OA) equipment
Audio-visual (AV) equipment
Home appliances
Wind power generation systems
Industrial Robots / Service Robots

・Motor Shipping Inspection
We support the transition from conventional sensory inspections—such as operator-based listening checks—to automated inspection systems. By measuring motor vibration and abnormal sounds, our solution enables pass/fail judgment and can also detect internal bearing abnormalities.

・Vibration Monitoring of Motors and Pumps
By continuously monitoring motors installed in equipment, our system helps accurately determine optimal timing for parts replacement, supporting more efficient maintenance and reduced downtime. It also plays a key role in preventing unexpected failures and associated accidents.

・Tracking Analysis of Vibration and Noise in Rotating Machinery
We analyze vibration and noise generated by rotating machinery such as motors, generators, and transmissions, breaking down the frequency components according to rotational speed. This allows us to identify at which rotational speeds specific vibrations or noises become prominent. We offer a comprehensive total solution, from sensor measurement to data analysis.

We visualize motor noise and vibration issues to support improved performance and quality.
Our solutions specialize in the vibration and noise analysis of motors, which are essential components in manufacturing equipment and plant facilities. We offer a full lineup of sensors—including microphones and accelerometers—as well as measurement and analysis instruments. By utilizing FFT analysis, we contribute to anomaly detection, identification of resonance phenomena, and preventive maintenance.
In addition to motors, we also provide detailed analysis of noise and vibration from a wide range of mechanical systems, including pumps, piping, automobiles, railway equipment, home appliances, and electronic components. Furthermore, we flexibly support on-site solutions requiring FFT analysis, such as resonance and frequency response evaluation of mechanical structures using electromagnetic shakers or impulse hammers.