YMIN Capacitors LKF/LKM Solution For Overheating And Burnout Of ESC Capacitor Pins/Leads In Drones

(MENAFN- Market Press Release) April 13, 2026 1:22 am - Addressing Capacitor Pin/Lead Overheating and Burnout under Instantaneous High Current in Drone ESCs: YMIN Aluminum Electrolytic Capacitor LKF/LKM Application Solutions

In the power systems of drones and model aircraft, the electrolytic capacitors at the input of the ESC power board, installed at the power input and in front of the power MOSFET, are primarily responsible for absorbing the peak current output from the battery and stabilizing the bus voltage. For high-performance racing drones, speed drones, and industrial drones, this location is also a critical node in the instantaneous high-current transmission path.

When the drone is in extreme maneuvering conditions such as rapid acceleration, high-speed right-angle turns, and steep climbs, the ESC needs to provide the motors with extremely large instantaneous current within milliseconds. At this time, the input electrolytic capacitors not only have to perform the basic functions of filtering and energy storage, but also have to withstand extremely high instantaneous current pressure; their performance directly affects the extreme operational stability of the ESC.

Why do capacitors fail at the input of drone ESCs?

In practical applications, typical fault phenomena reported by customers are as follows: During competitions, high-performance racing drones or speed drones occasionally experience sudden ESC stalling and drone crashes when performing rapid acceleration, high-speed right-angle turns, etc. Disassembly of the failed equipment revealed that the failure points were concentrated on the external solder joints of the electrolytic capacitors at the ESC input terminal, or at the connection points between the capacitor's internal leads and the foil. The consequences included melted solder joints, overheated and broken internal leads, and subsequent irreversible hardware damage, competition losses, and safety hazards.

The core issue of this type of problem is not limited to conventional electrical performance parameters. The customer had previously selected liquid aluminum electrolytic capacitors with acceptable nominal ESR (Equivalent Series Resistance) and ripple current, and even tested relatively expensive solid-state capacitors. However, under high-load maneuvering scenarios, these capacitors still could not meet the instantaneous high current handling requirements of the UAV's ESC, and the failure remained unresolved.

Root Cause: More Than Just ESR and Ripple Current

Under the impact of extreme instantaneous currents, the physical path of current flow becomes a performance bottleneck: if the cross-sectional area of??the capacitor's internal leads or external wires is insufficient, the local current density will increase significantly, generating a large amount of heat; if the lead material is not pure enough, has high resistance, or the solder joint has high impedance and insufficient mechanical strength, these connection points are more likely to become weak points in the entire circuit under the combined effects of thermal stress and electromagnetic forces, ultimately leading to failure.

Therefore, for high instantaneous current applications such as the input terminals of drone ESCs, the focus of capacitor selection should not only be on the conventional criteria of "low ESR" and "ripple current compliance," but also on the capacitor's current-carrying structure design, internal connection process, and structural reliability under high-pulse conditions to fundamentally avoid failure risks.

Yongming's Application Solution for Through-hole Aluminum Electrolytic Capacitors

To address the pain point of high instantaneous current under high-load maneuvering of drone ESCs, Yongming recommends the LKF/LKM series through-hole aluminum electrolytic capacitors as a dedicated solution. This series of capacitors boasts a low ESR advantage, with ESR values??as low as below 20m?, rivaling the performance of leading Japanese competitors. Thanks to a special lead structure design, the ripple current per unit can reach 5500mA, stably providing instantaneous ultra-high current support for UAV ESCs. The product is designed collaboratively from both electrical performance and physical structural reliability perspectives, ensuring no structural failure under extreme operating conditions.

We have specifically reinforced the capacitor's critical current path to improve its instantaneous current carrying capacity and thermal shock resistance. Employing low-impedance, high-reliability internal connection technology effectively reduces hotspot temperature rise during current transmission. Simultaneously, combined with overall thermal design and a high-quality material system, we minimize localized heat accumulation under high-current surges, comprehensively ensuring stable capacitor operation.

For UAV ESCs, this solution is more suitable for applications involving high-frequency pulsed high current and frequent high-load maneuvers. Unlike general-purpose capacitor selection methods that only focus on conventional parameters and are suitable for general filtering and energy storage scenarios, this approach better meets the actual operational needs of UAVs.

Application Testing Feedback

Under the same or even more stringent extreme flight test conditions (e.g., continuous "full throttle-emergency braking" cycle test), we compared the measured results before and after replacing the capacitors with Yongming LKF series capacitors: Before adjustment (using conventional capacitors): the highest temperature of the capacitor leads reached 237?, and pins or internal leads melted during the test; After adjustment (using Yongming LKF series): the highest temperature of the leads dropped to 117?, the temperature rise decreased by 120?, and no pins or leads melted again during the entire test cycle.

The test results show that Yongming LKF/LKM series capacitors can significantly reduce the temperature rise of the leads under instantaneous high current surges, completely eliminating physical connection failures caused by overheating, fully verifying their structural reliability under extreme pulse conditions, and perfectly adapting to the operational requirements of UAV ESCs.

Conclusion

For the input of drone ESCs, electrolytic capacitors not only perform the basic functions of input filtering and energy storage, but also occupy a critical position in the battery's instantaneous high-current path. When applications involve high-load maneuvers such as rapid acceleration, high-speed cornering, and sharp climbs, capacitor failure modes may manifest as solder joint melting or internal pin breakage due to overheating. For this application scenario, YMIN's LKF/LKM series offers corresponding through-hole aluminum electrolytic capacitor solutions, serving as a preferred choice for applications like UAV ESCs where high instantaneous current and structural reliability are critical.

For further information on relevant models, samples, or application selection support, please consider specific voltage, capacitance, and size requirements.

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