Flywheel Energy Storage (Part II)
Graz University of Technology
Institute of Electrical Measurement and Measurement Signal Processing
Institute for Machine Elements and Methods of Development
An Opportunity for the Automotive Industry and Beyond A. Buchroithner and Professor G. Jürgens
2. FESS Rotor Design Balancing quality
The selection of the electric motor type is influenced by the following arguments:
Resonance frequency
Energy content
(use of reluctance machines)
1. Idle Losses 2. Safety Behavior 3. Centripetal Stress
Rotor design
(avoidance massive rotor parts)
(use of high strength electrical sheets and fiber composite materials)
Integration of
Costs
Impact marks
E-Machine
Burst containment from mild steel
Safety
Fragments of electric motor
Cooling
Bearing design
End plates from high strength steel
3. FESS Housing Design
Power supply
Plastic deformation of burst ring
Accelerometer
Laser displacement sensor
To avoid problems of mobile FESS such as gyroscopic bearing loads, low energy density and safety issues Stationary FESS:
Power Electronics
Vehicle and Subsystem
-20
-20
-40
-40
-60
-60
-80
-80
-100
-100
10000
5000
0 5 Drehzahl
10
15
20
Besch. unten
25
s 30
Beschl. oben
Sensor data
Critical Components
Energy intake
Repellent SmCo Magnets
B) Reduction of Axial Loads Magnetic weight compensation using repellent SmCo-magnets
Silikonring
Contact Component Test Rigs
Dipl.-Ing. Armin Buchroithner Institut für Elektrische Messtechnik
Subsystem Synthesis Solutions
Bearings
Resilient Bearing Seat
Rotor
Metal Sheet Stack Rotor
Safety Housing
Optimized Steel Containment
Primary Energy Storage
Transmission
0 15000
0
Cast silicone bearing seat allowing super-critical operation
Vacuum pump
Supersystem Analysis
Prime mover
20000
Silicone Bearing Seat
The benefits of FESS for mobile applications lead to the development of prototypes and component test beds :
Secondary mover
20
Steel Flywheel
Summary
Secondary Energy Storage
20
Down-Sized Ball Bearing
Deckel
Geography and Infrastructure
40
1
Lagerhülse
Application
40
25000
A) Reduction of Radial Loads
Grid
Energy Source
60
Low-Loss Bearing Design
PV panel Power electronics
Energy Storage
60
0
Collection of a statistically significant number of samples
Image: TEA Machine Components Inc.
Vehicle + Environment
80
Torn burst ring
Magnetic Coupling
Photograph: © SECAR Technologie GmbH
80
Signal amplifier
Alternatives: FESS for Renewable Energy FESS
100 100 30000 m/s**2 m/s**2 rpm
Surface: Magnetic flux density norm (T) Contour: Magnetic vector potential Phi component (Wb/m)
Coolant pump
Burst kinematics
Geometriy: Units (mm), air gap 4.2 mm
3. So far no design guidelines available in literature.
Vacuum pump
Evaluation of tests
of for
R.p.m. counter
Duktile Test-Flywheel
Brittle Test-Flywheel
Manometer
Vacuum housing
2. Safety and image technology is critical market penetration.
Electric motor
Trest specimen
1. Containment has significant effect on specific energy of FESS.
Test Bench for Burst Containment Investigation
Burst containment design for high speed rotational machines is becoming increasingly important.
Cooling system
und Messsignalverarbeitung Technische Universität Graz Inffeldgasse 23/II A-8010 Graz Email:
[email protected] Telephone: (0316) 873 - 30514
Institute of Electrical Measurement and Measurement Signal Processing
