Table 2.

Comparative analysis for different PGMs

Types	Principle	Structures	Characteristics	Limitations	Applicability
EMG	Flux changes with magnet-coil motion	•Radial flux •Axial flux	•Low voltage & high current •High output capability •High-frequency response	•Complex structure •Poor performance at micro size •Inefficient at low frequencies	•Macro size •High wind speed •Horizontal or Darrieus rotor
PEG	Deformation forces stress/strain in PE material	•Cantilever beam •Flexural structure •Stacked structure	•Medium voltage & current •Simple and flexible structure •Resonant frequency response	•Hard to couple rotors •Limited operating frequency	•Unlimited size •Stable wind speed •Depends on construction
TENG	Triboelectric films produce potential differences post-separation	•Contact separation •Lateral sliding •Single electrode •Freestanding TE-layer	•High voltage & low current •High power density •Simple and flexible structure	•Limited operating life generation potential	•Micro size •Low wind speed •Savonius rotor or wind cup