2012 The former Hitachi Cable News Release
Information (including product prices, product specifications, details of services, launch dates, inquiry information, and URLs) contained in this news release is current as of the date of the press release but is subject to change without notice. Please note that details may differ from those effective on the search date.
Development of High PDIV Enameled Wires
that Suppress Partial Discharge
Hitachi Cable announces the successful development of high PDIV (Partial Discharge Inception Voltage) enameled wires that suppress partial discharge in order to achieve motors with a longer life-time, greater compactness, and more power.
Hybrid vehicles and various industrial machines are equipped with inverter-fed motors. It is well known that rapidly changing, highly steep voltages (inverter surge) are applied to inverter-fed motors. When the inverter surge voltage becomes higher than the PDIV of the enameled wires used for the motor coil, partial discharge occurs between them, eroding the insulation coating and causing the motor’s insulation to break down. Hence, it requires partial discharge-resistant or partial discharge-suppressing enameled wires.
Through the use of organic/inorganic nano-composite materials, the Hitachi Cable Group is developing inverter surge resistant enameled wires with an improved life-time. Our enameled wires are used in many inverter-fed motors, including those in hybrid vehicles.
As one of the development projects, we have developed high PDIV enameled wires that suppress partial discharge in order to achieve motors with a longer life-time, greater compactness, and more power.
In these developed articles, we have developed high PDIV enameled wires by using low dielectric constant materials with high heat resistance as the insulation coating. The developed articles lineup includes high PDIV enameled wires using three types of low-k insulation coating materials (polyesterimide, polyamide-imide, and polyimide).
In particular, the high PDIV polyimide enameled wire shows a 13% improvement in PDIV over that of our general polyamide-imide enameled wire (AIW). This has made it possible for us to produce thinner insulation coating for enameled wires. As a result, their life-time is longer, and the lamination factor is increased. Using these enameled wires will improve the reliability of motors, reducing their size and increasing their power.
Hitachi Cable Group is committed to continuing development aimed at further improvement of enameled wire performance, and to expanding our corresponding business operations.
