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Development and application of a diagnostic technology of electric devices by noticing higher harmonics of electric power source   NITTA Junya1   1. Arcadia Systems, lnc., Shin Osaka Prime Tower 20th Floor, 6-1-1 Nishi Nakajima, Yodogawa-ku, Osaka-shi, 532-0011 Japan (nitta@arc-mec.co.jp)   Abstract: A unique diagnostic technology for electric devices has been developed to detect anomaly and estimate the cause of failure of the device easily by analyzing the higher harmonics of electric source current. Higher harmonic diagnosis devices have been realized and improved to be served as the portable device for maintenance works of various electric equipment such as AC/DC motors, inverters, transformers, cables, etc.. The device has many favorable characters such as (i)capable of no direct contact test to the equipment on live state, (ii)not only the mechanical  but also the electrical anomaly and deterioration  can be diagnosed, (iii)capable of detecting incipient deterioration easily to prevent from developing to rare short, (iv)possible to apply for inverter, (v)possible to diagnose notwithstanding the capacity and voltage if the equipment is higher than 1 horse power,  (vi) the weight of the device itself is as light as ca. 7 kg which includes battery power source, and (vii) easy to use even by non-experienced workers to handle and diagnose the equipment in real field. The merit of the device has been recognized in the domains of steel, electric power, chemical and automobile industries in Japan, Korea and China. For the appreciation and memory of the inventor of the device, late Hiroshi Koh, the principle and the product development of the higher harmonic diagnosis device are introduced in this paper, together  with the prospect of further deployment by big data science and IoT (internet of things). Keywords: higher harmonic diagnosis; no contact live diagnosis; simultaneous diagnosis of mechanical and electrical anomaly; principal component analysis
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