I. Application Scenarios: Robot Joint Motor Controllers

In the field of robot joint motor controllers, with the continuous upgrading of high integration, high response speed, and intelligence levels, capacitor selection needs to consider performance, space layout, and lightweight design. Aluminum electrolytic capacitors are installed at the power input of the drive bus, close to the power MOSFET bridge arm. Their main function is to absorb bus voltage ripple and provide instantaneous large current for the peak power demands of motor acceleration and deceleration, directly determining the system's power supply stability and control accuracy.

YMIN's LKZ series high-capacity density liquid aluminum electrolytic capacitors have been successfully used to replace traditional MLCC (multilayer ceramic capacitor) solutions in quadruped robot joint motors, suitable for applications with limited space and strict standards for dynamic response and cost control.

II. Core Challenges: Engineering Difficulties of Traditional MLCC Parallel Solutions

In practical applications, the customer's original design used 48 100V 10μF 1210 packaged ceramic capacitors connected in parallel. Several problems arose during operation:

**Large Space and Cost Pressures:** A large number of parallel MLCCs occupied excessive PCB area, and the driver could not meet the miniaturization requirements of the joint module; the multiple ceramic capacitors also increased the overall material cost.

**Insufficient High Current Carrying Capacity:** The capacitance of a single MLCC is relatively small, and the total capacitance after parallel connection is still low. This results in insufficient performance to handle high current loads, poor current carrying capacity, causing severe heat generation, and exacerbating equipment operating noise.

**Unable to Meet Control Accuracy Standards:** The shortcomings in capacitor performance affected the system's power supply stability and response speed, causing the control program execution accuracy to fall short of design expectations.

III. Root Cause: Material and Process Limitations of Traditional MLCCs

From a technical perspective, traditional ceramic capacitors, limited by material properties and manufacturing processes, cannot achieve high capacity within a limited volume, making it difficult to meet the core requirements of high-instantaneous energy supply and large-capacity energy storage in joint actuators. Specifically, this manifests as insufficient energy storage capacity per unit volume and low current carrying capacity. In designs requiring resistance to peak current surges and ensuring system safety and reliability, traditional MLCC solutions have inherent flaws.

IV. Yongming Aluminum Electrolytic Capacitor LKZ Series Solution

4.1 Technical Solution Overview
Yongming's LKZ series liquid aluminum capacitors utilize high-density materials and professional anti-vibration technology. This series boasts an ESR (Equivalent Series Resistance) as low as 200mΩ (taking the 150μF model as an example), and a maximum single-cell ripple current of 0.9A. Within the same volume constraints, a single capacitor has a capacity of 150μF, and four capacitors connected in parallel can achieve a total capacity of 600μF, efficiently meeting the performance requirements of high-end applications.

Application Results (Based on Actual Replacement Cases)

Replacing the original 48 MLCCs with four LKZ 100V 150μF 8×25 coated aluminum shell capacitors in parallel yielded significant results:

Overall high current carrying capacity nearly doubled compared to the original solution.

Physical space usage was reduced by approximately 20%.

Overall cost was reduced by over 60%.

Heat generation and operating noise issues were completely resolved, and control program execution accuracy met standards.

Furthermore, this solution utilizes purely domestic processes and raw materials, ensuring supply chain self-control from the source, resulting in more stable and reliable product delivery.

V. Scenario-Based Q&A

Q1: Robot joint actuator PCB space is limited. To meet high current requirements, dozens of ceramic capacitors must be connected in parallel, leading to excessive cost and space usage. Are there better capacitor solutions?
A1: Yes. Yongming LKZ series liquid aluminum capacitors offer a single-cell capacitance of up to 150μF/100V. Only four capacitors connected in parallel achieve a total capacitance of 600μF, outperforming the solution of 48 100V 10μF MLCCs. Actual measurements show a saving of approximately 20% in installation space and a cost reduction of over 60%. Their low ESR (