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Latest Technological Trends in Aluminum Electrolytic Capacitors for Robots

NICHICON CORPORATION

The introduction of factory automation equipment and robots has increased rapidly in recent years. China in particular, is actively investing in factory automation and labor-saving technologies due to labor shortages and other factors. For these devices, indispensable servo systems that exercise control following specified positions and speeds are incorporated into factory automation equipment. This includes semiconductor manufacturing equipment, mounters, industrial robots and other equipment. Parts used must be compact, have a high withstand voltage, long life and charge/discharge durability performance. The latest technological trends in aluminum electrolytic capacitors for robots and other industrial machinery are:

■ LGN series of snap-in terminal type aluminum capacitors
The LGN series (image 1) is a miniature snap-in terminal aluminum electrolytic capacitor guaranteed to operate at 105°C. This product is used mainly in industrial machinery including high voltage inverter circuits in power electronics. Because of the advances being made in high voltage systems, due in part to the increasing demands for high-efficiency and energy conservation, there is increasing demand for higher voltage resistance aluminum electrolytic capacitors. These capacitors are used in inverter power sources and other control circuitry. Demand is particularly strong for solar and wind power generators in the renewable energy market. Previously the LGN series had a maximum voltage rating of 500V. The addition of the 600V ratings makes the LGN series the highest rated voltage in the industry. The LGN series is the choice for power electronics devices that place a heavy emphasis on energy-efficient operation. The LGN series uses highly reliable electrodes that have been formed with a high withstand voltage oxide film. The LGN series offers the industry’s highest voltage, employing electrolytic solution and high-withstand-voltage electrolysis paper with enhanced film restoring capacity at high voltages providing long-term stability. With a newly developed electrolytic solution that can withstand 600V at 105°C, we have been able to achieve approximately 20–30% of the high breakdown voltage. To meet system voltage requirements, connecting multiple aluminum electrolytic capacitors in a series enables a reduction in required parts compared to previous products. For example, to generate 1,200V, three 400V units are required, but only two 600V products are necessary. Thus saving space.

■ LGM series of snap-in terminal-type aluminum electrolytic capacitors
The LGM series (image 2) is an ultra-compact snap-in terminal-type aluminum electrolytic capacitor guaranteed to operate at 105°C for 2,000 hours, used mainly in industrial machinery including inverters for power electronics and switching power supplies. Industrial equipment is becoming increasingly smaller due to the growing need for power-saving and efficiency. Accordingly, the components also need to be smaller. To meet these demands, NICHICON developed the LGM series, which is smaller than the conventional LGL series. The LGM series utilizes a high-capacity electrode foil, in addition to a highly durable electrolyte and electrolytic paper, all of which combine to achieve a small product size. These developments make the LGM series up to 16% smaller (by volume) than the LGL series and allow NICHICON to offer aluminum electrolytic capacitors that are ideal for space-saving circuit design.

Product Size Comparison
Rated voltage/
capacitance
LGM series LGL series Volume
reduction
450V-180μF Φ25×25L Φ25×30L -16%
450V-180μF Φ22×30L Φ22×35L -14%
450V-390μF Φ30×35L Φ30×40L -13%
450V-820μF Φ35×45L Φ35×50L -10%

■ LNU series of screw terminal-type aluminum electrolytic capacitors
The LNU series (image 3) is a high withstand voltage miniature screw terminal-type aluminum electrolytic capacitor guaranteed to operate at 105°C. Development points include the adoption of electrode foil using high withstand voltage oxide film, the use of an electrolytic solution with enhanced oxidized film restoring capacity at high voltages with long-term stability, the use of low-density, high-withstand-voltage electrolysis paper and an enhanced heat dissipation structure realizing a higher rated voltage (525V) and longer life (5,000 hours) than the LNT series. This series is 20–30% smaller when compared to other 500V rated products. This contributes to equipment miniaturization and weight reduction. The LNU also incorporates our rapid charge-discharge technology, which has a strong reputation in industrial machinery applications where severe load fluctuation is an issue. This technology enables the capacitor to be used in such products as AC servo motors where repeated rapid charging and discharging over short periods of time is required. With a higher rated voltage than standard products, this capacitor can be used for smoothing currents in regions with unstable power source voltage conditions that cause fluctuating input voltages. It also corresponds to system voltage demands, enabling a reduction in parts required when connecting multiple aluminum electrolytic capacitors in series, making it ideal for circuit designs with reduced size and cost.

With an expansive lineup of aluminum electrolytic capacitors, NICHICON has built a strong reputation on its ability to leverage its strengths to offer one-stop development and production in accordance with the desired specifications of customers in a variety of areas. Going forward, we will continue promoting the development of new products to meet customer expectations.

Image 1: LGN series of snap-in terminal type aluminum capacitors

Image 1:LGN series of snap-in terminal type aluminum electrolytic capacitors

Image 2: LGM series of snap-in terminal-type aluminum electrolytic capacitors

Image 2: LGM series of snap-in terminal-type aluminum electrolytic capacitors

Image 3: LNU series of screw terminal-type aluminum electrolytic capacitors

Image 3: LNU series of screw terminal-type aluminum electrolytic capacitors

 
 

NICHICON CORPORATION
From the Dempa Shimbun, Jan. 10, 2018

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