Product News January 16, 2018

 NICHICON CORPORATION has applied its simulation technology toward the development of the UXY series of lead-type aluminum electrolytic capacitors. These capacitors utilize a high vibration-resistant structure that is optimized for vibration required by the market for automotive applications.
 This product was displayed 9th EV & HEV Drive System Technology Expo, held at Tokyo Big Sight on Wednesday, January 17, to Friday, January 19, 2018. It will also be on display at the Applied Power Electronics Conference (APEC 2018) being held in San Antonio, TX from March 5 to March 7, 2018

Overview/Development Background

 In recent years, the placement of the engine control power train ECU as well as other control units have been moved from the cabin to the engine compartment as a result of their placement directly on the engine and transmissions the demands for high vibration resistance has increased. The UXY series was developed to meet these market demands.
 In conventional products, there is a gap between the element and case which allows the element to shake, and increases the risk of disconnection of the lead terminals in high vibration environment. This series of products addresses the issue by using slits at the side of the capacitor case. These slits reduces stress on the lead terminal and therefore increases vibration resistance. When developing this case, we used simulation technology to compare the amount of stress placed on the lead terminals as the number of slits varied. Figure 1, shows the simulation results for the different number of slits. This simulation indicates that that stress on the lead terminals tends to decrease as the number of slits increases, with the stress reduction tending to taper off after six or more slits. Taking into consideration the tradeoff between the safety of case processing and increasing the number of slits, we therefore decided to use six slits. We launched the UXY series after confirming vibration resistance through actual testing of the cases with slits.

  • Figure 1. Number of slit simulation results (assuming φ18 x 40L size)

Features

 As in-vehicle applications require high capacity, product sizes increase. However, as product size becomes larger, the vibration resistance tends to decrease because of an increasing amount of stress placed on the lead terminal bases. To solve this problem, we employed a new, proprietary structure to realize a larger-size product (φ18 x 31.5L, φ18 x 40L) able to handle up to 40G of vibration acceleration and high temperatures of 125C and 135C.
 With this series lineup, NICHICON believes it can meet demands for high vibration resistance in various in-vehicle control units. By using a case with slits, we have realized a capacitor whose vibration resistance does not change over time.

Main Specifications

  • Rated voltage range

: 25 to 50V

  • Rated capacitance range

: 2300 to 11,000μF

  • Product dimensions

: φ18 x 31.5L , φ18 x 40L

  • Life

: Guaranteed 3,000 hours at 125C; guaranteed 3,000
hours at 135C (with allowable ripple current derating)

  • Terminal shape

: Lead type

  • Samples

: Being provided

  • Mass production

: From January 2018

  • Production plant

:NICHICON (OHNO) CORPORATION
1-11-2 Shimoyoro, Ohno-shi, Fukui Pref.,
(ISO 9001, ISO/TS 16949 and ISO 14001 certified)

Anti-vibration performance

Category performance
Vibration After testing the following vibration conditions at room temperature (15 to 35C), satisfies the following when measured to return to 20C
Rate of change in capacitance Within ±5% of initial value
tanδ Below initial standards
Leakage of current Below initial standards
Vibration conditions
Vibration frequency range 10 to 2,000Hz
Amplitude or acceleration Total amplitude of 1.5mm or 392m/s2 (40G), whichever is looser
Sweep rate 0.5 octave/minute
Vibration direction and time Two hours each in the x, y, and z directions, for a total of six hours
Fixed Fixed the product and its leads in a fixture (inquire for details)
  • Launch of the UXY series of vibration-resistant,
    lead-type aluminum electrolytic capacitors

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