Humanoid Robot Joints: Sources of Eddy Current Loss and Structural Optimization Strategies
Eddy current loss is a major cause of heat generation and service life degradation in humanoid robot joints. This article analyzes the drawbacks of the riveting process and introduces the optimized adhesive insulation structure.
Oct 22,2026
Under dynamic operating conditions of humanoid and quadruped robots, alternating magnetic fields inside joints continuously generate eddy current loss, which constitutes one of the key triggers for motor overheating, insulation aging and shortened service life of the complete machine. Many R&D teams encounter a common issue during prototype commissioning: prototypes deliver satisfactory performance in static tests, yet suffer excessive temperature rise and performance derating after continuous dynamic gait cycles. Eddy current loss is often an easily overlooked factor.
The conventional riveting assembly process breaks the insulation isolation of stator laminations and creates extra conductive paths. Under alternating magnetic fields, substantial eddy currents are induced and bring additional heat. With prolonged cyclic operation, the risk of insulation layer damage increases further, compromising joint operational safety and durability.
The adhesive-bonded insulation process maintains complete electrical isolation between silicon steel sheets, breaks cross-conductive loops, effectively suppresses eddy current generation and cuts extra thermal loss. Under identical operating conditions, it reduces internal heat buildup, slows insulation aging and improves joint stability under high-frequency dynamic gaits.
It should be noted that eddy current loss suppression is not merely an assembly-process issue. It requires integrated design combining segmented magnetic poles, electromagnetic simulation and stator lamination technology. JEO conducts multiple rounds of iterative optimization targeting eddy currents at the motor simulation stage. The adhesive insulation structure has been implemented across its full range of joint products to mitigate loss risks at the structural source.
For R&D teams selecting components for complete machines, apart from torque and speed specifications, it is also necessary to evaluate the internal structural scheme of joints and fully consider thermal and durability performance under dynamic working conditions.
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