16-05-2012, 12:03 PM
PERFORMANCE OF A MAGNETICALLY SUSPENDED FLYWHEEL ENERGY STORAGE DEVICE
[attachment=22118]
Introduction
Latest developments in the eld of composite materials and active magnetic
bearings (AMB)
have led to kinetic energy storage devices which are smaller and lighter and which operate
at higher rotational speed. This increase of eciency makes kinetic energy storage devices
interesting for several elds of application.
Compared with kinetic energy storage devices static energy storage devices such as batteries
or capacitors have limited lifetime cycles and low power and capacity.
Description of the Flywheel Energy Storage System
The system features an inner type stator with the radial magnetic bearings (see gures 2,
3, 4). The composite
ywheel is connected to the outer type rotor with a cone interference
t. The rotor itself consists of an inner and an outer part, with the stator of the electrical
machine in between (see gure 3). One single thrust bearing on the top of the rotor carries
Behaviour of a Magnetically Suspended Gyroscope
In this section the basic behaviour of gyroscopes with magnetic suspension is shown. More
information on the behaviour of gyroscopes in general can be found in [Mag71].
For simplicity the system behaviour is shown for a linearized bearing model using decentralized
PD-control. In this case the rotor behaves like an elastically suspended gyroscope
(suspension with spring and damper).
the weight.
[attachment=22118]
Introduction
Latest developments in the eld of composite materials and active magnetic
bearings (AMB)
have led to kinetic energy storage devices which are smaller and lighter and which operate
at higher rotational speed. This increase of eciency makes kinetic energy storage devices
interesting for several elds of application.
Compared with kinetic energy storage devices static energy storage devices such as batteries
or capacitors have limited lifetime cycles and low power and capacity.
Description of the Flywheel Energy Storage System
The system features an inner type stator with the radial magnetic bearings (see gures 2,
3, 4). The composite
ywheel is connected to the outer type rotor with a cone interference
t. The rotor itself consists of an inner and an outer part, with the stator of the electrical
machine in between (see gure 3). One single thrust bearing on the top of the rotor carries
Behaviour of a Magnetically Suspended Gyroscope
In this section the basic behaviour of gyroscopes with magnetic suspension is shown. More
information on the behaviour of gyroscopes in general can be found in [Mag71].
For simplicity the system behaviour is shown for a linearized bearing model using decentralized
PD-control. In this case the rotor behaves like an elastically suspended gyroscope
(suspension with spring and damper).
the weight.