emkit

Launch and Recovery Using the

EMKIT System

G Bellamy, J Watson (MoD), and K Flint – Converteam December 2010

Presented by Kathleen Lentijo, PhD

CUSTOMISED TECHNOLOGY FOR CUSTOMER SUCCESS Issue B © 2010 Converteam UK Ltd. All rights reserved

COMMERCIAL IN CONFIDENCE

Slide 2

EMKIT Demo

•EMKIT Technology

•Components

•EMKIT to EMCAT

•Wrap-up



Slide 3

CVT Electromagnetic Launchers

EMKIT EMKIT+ EMCAT

Launch Mass 524 kg 12,000 kg 37,000 kg

End Speed* 51 m/s 50 m/s 78 m/s

Length 15 m 94 m 94 m

Energy

Storage 6.4 MJ 24 MJ 480 MJ

Voltage Level Low Low Medium

Example

Aircraft Hermes,

Predator A

Global

Hawk F35-C

TRL (est.) 6/7 6 4/5

*End speed at max thrust

with given launch mass

EMKIT = Electromagnetic Kinetic Integrated Technology

EMCAT = Electromagnetic Catapult



Slide 4

Linear Motor Development

History of linear motor

technologies:

Traditional linear induction

motor (60+ years)

Linear synchronous motors

(~1998)

Advanced linear induction

motors (ALIM) for EMKIT

(2001-2007)

ALIMe (2009+)



Slide 5

The EMKIT system



Slide 6

Topology covered by

UK patent No: 240697 Advanced linear

induction motors

Sine wave filters

for low EMI

Diesel Gen

PWM AFE

converters

Static

switches

High speed induction

motor energy stores

The EMKIT System

Shuttle’s

reaction plate

Charge/launch

contacts



Slide 7

The EMKIT Power Converter and Energy Storage

PWM Converter and Controller

Energy Storage



Slide 8

EMKIT+ and Super Capacitors

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44

12 M joule energy stores EMKIT static switches

EMKIT converters EMKIT ALIMe stators 44 in total

Super-capacitor energy store

DG



Slide 9

EMKIT Electromagnetic Arresting System

The proven ability of the

ALIMes to provide

electromagnetic braking

can be used for arresting

of UAVs and aircraft.

Proof of concept proposed.

Energy recovery.

An enabler for recovery of

UAV’s on small flight decks at

sea.

Can use same catapult for

launch and recovery.

For aircraft carriers, flight

deck logistics likely to make

this prohibitive for full size

aircraft Shows how to validate at the EMKIT site



Slide 10

The EMKIT Launch And Braking Profile



Slide 11

EMKIT Measured ALIM Currents

L1 and L2

Switched Off

3-Phase ALIM current

during launch:

shows shuttle location, and

illustrates effect of static switches.



Slide 12

Mature technology since September 2007:

2,500+ successful launches

< 1% error for all speeds

Less than 4.5 oC temperature rise per launch

Dynamic control of energy stores, ALIMs, and plant proven

EMI above slot < Def-Stan requirements

EMKIT Key Trial Results



Slide 13

The EMCAT system



Slide 14

Low voltage

technology

Medium voltage

technology

EMKIT And EMCAT Applications



Slide 15

ALIMs have to be manufactured in sections.

This result in half-filled slots in split zone, reduced airgap flux and static end effects

Result is thrust perturbations Linear motor winding in middle of a section

Linear motor winding at section joints

Joint

Linear motor winding in middle of a section

Linear motor winding at section joints

Joint

Linear Motor End Effects



Slide 16

Test Results For The ALIMe System

The high speed section of EMKIT has been fitted with the new ALIMe stators to validate the design, the results are shown below for rated thrust and speed.

The ALIMe design is now proven for high power launch systems

Time in ms

15

10

5

0

- 5

- 10

Mo

vin

g m

ass a

ccele

rati

on

in

G

60

50

40

30

Sp

eed

in

m/s

an

d

Dis

tan

ce i

n m

20

10

0

500 0

Acceleration

Speed Distance

ALIM region with increasing end effects ALIMe region with no end effects



Slide 17

EMCAT ALIMe’s modules designed to fit in a 1.5 m deep trough.

The EMCAT ALIMe Trough Design

De-ionised water cooled static switch

Transverse force support and deck plates to allow for deck bow / sag.

Reaction plate spray water cooled

Tandem ALIMe stators with AN cooling apart from start section with spray water cooling

Wheel-less shuttle guide

Standard aircraft nose gear spreader

Shuttle bottom guide and drain pan assembly,



Slide 18

3 kV Induction pulse generator based on Converteam’s standard

MGV0 or MGV1 high speed rotor design.

Operates at either 9300 rpm or 11700 rpm with 80 MJoules stored

energy via additional rotor mass.

Peak power of 24 MW with average power of approximately 3 MW.

Detailed design in progress and the main challenges are :

Proving, balancing and cyclic loading.

Bearing design for sea going motion with magnetic bearings.

Ship installation for withstanding gyroscopic forces.

Audible noise levels.

The alternative is the use of static super capacitors.

The EMCAT Rotary Energy Store



MV7000

Slide 19

The EMCAT Power Converters

MV3000

COTS converter used for EMKIT but has also been militarized for

applications such as the aux propulsion on LHD-8 (15,000+)

VDM25000

Military-grade converter used for main propulsion on DDG1000

MV7000*

COTS converter very successful in commercial applications (600+)

Militarized

COTS

Power

MV3000

IPSC,

VDM25000

LV MV

IPSC*

(Integrated Power System

Converter)

Military-grade converter

based on strengths of

MV7000 and VDM25000.

*possible EMCAT converters



Slide 20

The EMKIT….

is a mature technology

has many advanced features

is a derisking platform

has advanced the technology readiness of EMCAT

Conclusions

Thank you for your attention Thank you

www.converteam.com

http://www.converteam.com/

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