Summary Low-Loss Bearing Design Alternatives

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Alternatives: FESS for Renewable Energy. Bearings. 1. Down-Sized Ball Bearing. Steel Flywheel. Silicone Bearing Seat. Repellent SmCo Magnets. Su rfa ce.
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