Magnetic suspension bearing energy storage flywheel description
1. The flywheel energy storage battery system consists of three core parts: a flywheel, motor-generator and power electronic converter.
2. The power electronic conversion device inputs electric energy from the outside to drive the motor to rotate. The motor drives the flywheel to rotate. The flywheel stores kinetic energy (mechanical energy). When the external load requires energy, the flywheel drives the generator to rotate, converts the kinetic energy into electrical energy, and then passes the power electronic. The converter becomes the energy of various frequency and voltage levels required by the load to meet different needs.
3. The actual flywheel device mainly includes the following components: flywheel, shaft, bearing, motor, vacuum vessel and power electronic converter.
4. In actual work, the speed of the flywheel can reach 40,000~50000r/min. In order to reduce the energy loss during charging and discharging (mainly friction loss), the motor and the flywheel use magnetic bearings to suspend to reduce mechanical friction. At the same time, the flywheel and motor are placed in a vacuum container to reduce air friction. The net efficiency (input and output) of the flywheel battery is about 95%.


Main advantage
(1) Flywheel battery takes into account the advantages of energy storage devices such as chemical batteries, fuel cells and superconducting batteries
(2) High energy density: the energy storage density can reach 100-200 wh/kg, and the power density can reach 5000-l0000w/kg.
(3) High energy conversion efficiency: working efficiency is as high as 90%.
(4) Small size and light weight: the diameter of the flywheel is about 20 cm, and the total weight is about 10 kg.
(5) Wide operating temperature range: There is no strict requirement for ambient temperature.
(6) Long service life: It can be cycled for millions of times without being affected by repeated deep discharge. The life expectancy is more than 20 years
(7) Low loss, low maintenance: The magnetic suspension bearing and vacuum environment can make the mechanical loss negligible and the system maintenance period is long.


General parameters

Rotating speed	40000～50000r/min	Power density	5000～l0000w/kg	Energy storage density	100～200wh/kg
Inner diameter	20（mm）	Thickness	20（mm）	use	UPS, space flywheel, subway energy recovery
Outer diameter	40（mm）	Lubricant	No lubrication	Oil lubrication method	Magnetic bearings, no lubrication
Weight	20（kg）	Product Usage	For energy storage	Energy conversion efficiency	90%

For more information, please contact EECTECH