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Cable Technology Feature Article

October 21, 2008

Oki , Fanuc Team to Develop Non-Shielded Motor Drive Cable

By Jyothi Shanbhag, TMCnet Contributor

Oki Electric Cable and Fanuc Ltd. are developing a motor drive cable that significantly reduces the impact of conducted noise caused by inverter switching.
Oki Electric Cable provides various advanced communications cables, optical cables, and related electronic parts and equipment to the worldwide market. Its product line offers an increased density capability, targeted high speed and high reliability of communication equipment, measuring instruments, office machines and peripherals equipment.
The newly developed cable is named “Symmetric Motor Drive Cable 'SYM Series' with joint patent pending in Japan and overseas can double the recovery efficiency of conducted noise current.
“We always take environmental conservation activities seriously and are developing products that do not contain hazardous substances,” said Takashi Hattori, president of OKI (News - Alert) Electric cable, in a statement. “So for example, this cable bans all six subject substances in Europe's RoHS Directive.”
The company said that, with conventional cables, as inverter switching speeds become faster, conducted noise tends to increase as well. Conventional cables have low noise current recovery efficiency because the earth cable impedance is large, making it likely that peripheral equipment may malfunction due to conducted noise.
The new "SYM Series" achieves a noise current recovery efficiency that is equivalent to a shielded cable by reducing the earth cable inductance to the same level as a shielded cable. While the cable is a maximum of 15 percent thinner and 20 percent lighter than a shielded cable, the noise current recovery efficiency is equivalent.
Because the SYM Series eliminates the need for shielding, which adds another step when fabricating cable terminals, the cable offers increased flexibility and significantly improves the laying and installation characteristics.
OKI Electric Cable has succeeded in developing this new cable on their proprietary cable structure by balancing the three centers of the earth cable and motive power line, without using a shield. In addition, by bringing the cables close and reducing the size of the earth cable's impedance.
Company has recently released industry-first 3D FPC which enables 3D wiring, such as forming wave patterns or curves. This solution is expected to create new possibilities for new applications in the cable industry as well as the manufacturing industry.

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Jyothi Shanbhag is a contributing editor for TMCnet. To read more of Jyothi's articles, please visit her columnist page.

Edited by Mae Kowalke