Theoretical Vibration Analysis on 600 Wh Energy Storage Flywheel Rotor—Active Magnetic Bearing System

Table 1

Model parameters.

Parameter	Description	Value	Unit
𝑚	Mass of rotor	70	kg
𝐿	Length of rotor	0.505	m
𝐿𝑧1	Distance between 𝑂 and upper RAMB	0.3047	m
𝐿𝑧2	Distance between 𝑂 and lower RAMB	0.2463	m
𝐿𝑐1	Distance between 𝑂 and upper position sensor	0.3112	m
𝐿𝑐2	Distance between 𝑂 and lower position sensor	0.2518	m
𝐽𝑑	Transverse mass moments of inertia of rotor about the x- and y-axes	1.6426	Kg⋅m^2
𝐽𝑝	Polar mass moment of inertia of rotor about the 𝑧-axis	1.9235	Kg⋅m^2
𝑟𝑏	Distance between CG and external disturbances	0.263	m
𝑆0	Nominal air gaps in the x- and y-axes of RAMB	0.3	mm
𝜇0	Electromagnet parameter	4𝜋×10^−7	H/m
𝑖0	Bias currents	0.15	A
𝑧0	Nominal air gap in the 𝑧-axis of TAMB	0.3	mm
𝜔max	Design maximum speed	20000	rpm
𝜔	Rated speed	5000~16000	rpm