FPU Struts, Filter Wheel, Calibration Source 1

PACS IIDR 01/02 Mar 2001

FPUStruts, Filter Wheel, Calibration Source

D.Kampf, Dr. Roland GraueKayser-Threde GmbH

FPU Struts, Filter Wheel, Calibration Source 2

PACS IIDR 01/02 Mar 2001

FPU Suspension

• Mechanical/thermal Decoupling : Isostatic Suspension with 6 Struts– X-Translation, Rotation about Z : 3 Struts– Z/Y - Translation and Rotation : 1 Strut/2 Struts

• Dimensions:– Cross Section/Length Ratio : 50 mm2/70 mm

• Material (Baseline) : Stainless Steel for

Struts and Fittings• Mass (w/o contingency) : 1.5 kg

FPU Struts, Filter Wheel, Calibration Source 3

PACS IIDR 01/02 Mar 2001

Photoconductor Detector Suspension

• Mechanical/Thermal Decoupling: Isostatic Suspension with 6 Rods

– X-Translation, Rotation about X : 3 Struts– Z/Y - Translation and Rotation : 2 Struts/1 Strut

• Dimensions:– Cross Section : 13 x 2 mm2

– Length : approx. 40 mm excl. Fittings

• Material (baseline) : UD Kevlar 49 (0o -Orientation)

: Epoxi Matrix

: Ti 6 Al - 4V Fittings

• Mass (w/o Contingency) : 0.42 kg

FPU Struts, Filter Wheel, Calibration Source 4

PACS IIDR 01/02 Mar 2001

Filter Wheel Assembly Design

• Unlimited Angle of Rotation

• 2 Preloaded, Dry, Gold coated Bearings (GRW)

• Rotor for 2 (optional 4) filters

• Cryotorquer Drive

• Total Mass: 0.580 kg

• Rotor Inertia: 0.11 gm2

• Dynamic Straylight Baffle

FPU Struts, Filter Wheel, Calibration Source 5

PACS IIDR 01/02 Mar 2001

Filter Wheel Cryotorquer Drive

• Brushless Motor with Magnets Positioned at the Rotor

• Cryotorquer Drive Design: – 12 Poles

– 24 Magnets (Samarium-Cobalt)

– 2 Phases (Each Redundant)

– 12 x 180 Cu-Coil Windings

• Stator with 4 Hall - Sensors, Two for Each of the Coil Package

FPU Struts, Filter Wheel, Calibration Source 6

PACS IIDR 01/02 Mar 2001

FW Assembly

FPU Struts, Filter Wheel, Calibration Source 7

PACS IIDR 01/02 Mar 2001

FW Bearing / Housing

FPU Struts, Filter Wheel, Calibration Source 8

PACS IIDR 01/02 Mar 2001

Cross section of the motor

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1: Mechanical interface2: Flange3: Hall sensor4: Stator5: Yoke6: Rotor7: Hub8: Inner bore9: Permanent magnets

FPU Struts, Filter Wheel, Calibration Source 9

PACS IIDR 01/02 Mar 2001

Fig. 2.1-1: Position of the permanent magnets

Permanent magnets

N

N

N

S

S

S

N

N

S

S S

N

FPU Struts, Filter Wheel, Calibration Source 10

PACS IIDR 01/02 Mar 2001

Part-winding 2 (Phase 2)

Part-winding 1 (Phase 1)

Arrangement of the coils

FPU Struts, Filter Wheel, Calibration Source 11

PACS IIDR 01/02 Mar 2001

I = 0 I = 0I = 0

Phase 1

Phase 2

RotorForce

Permanent magnets

Coils

Stator

.

Principle of driving

FPU Struts, Filter Wheel, Calibration Source 12

PACS IIDR 01/02 Mar 2001

Phase 1

Phase 2

Phase 1

Phase 2

Hall sensor cable

Hall sensors

Support flange(GFK)

Phase 1

Phase 2

Phase 1

Phase 2

Hall sensor cable 16 x AWG 32

Stator part 1Stator part 2

Top side:4 x AWG 28

Bottom side:4 x AWG 28

Technical description

FPU Struts, Filter Wheel, Calibration Source 13

PACS IIDR 01/02 Mar 2001

Filter Wheel Cryotorquer Drive - Cont‘d

• Temperature Range (op.): 3 - 313 K

• Rotor Positioning by One Hall Sensor (Red.) and One Magnet at Each Stop (Powerless Dormitory Mode During Measurement Time)

FPU Struts, Filter Wheel, Calibration Source 14

PACS IIDR 01/02 Mar 2001

Cryotorquer Breadboard

FPU Struts, Filter Wheel, Calibration Source 15

PACS IIDR 01/02 Mar 2001

Filter Wheel Torquer Status

• Breadboard Tested at LHe-Temperatures

• Torquer Constant: 0.3 Nm/A (Per Stator Package)

• Operational Current: 0.25 A (Per Phase and Stator Package)

• Power Dissipation: <10 mWs (per Position Change)

: 25 mW (max)

FPU Struts, Filter Wheel, Calibration Source 16

PACS IIDR 01/02 Mar 2001

Filter Wheel Assembly

Mass:– Stator : 75 g– Rotor : 265 g– Bearings : 20 g– Filter Wheel : 100 g– Mechanical Support : 120 g

_________________________________________________________

Total (w/o Contigency) : 580 g

FPU Struts, Filter Wheel, Calibration Source 17

PACS IIDR 01/02 Mar 2001

Flow diagram for Q-tests cryomotor F in a l te st

R T , co ld

L ife cycle , co ld(tb d cyc le s)

R a nd o m v ib ra tionco ld

S in e v ib ra tionco ld

S in e se a rchR T , co ld

T h e rm a l cyc leR T , co ld , R T

F u n ctio n a l T e stR T , co ld

FPU Struts, Filter Wheel, Calibration Source 18

PACS IIDR 01/02 Mar 2001

Calibration Sources

• Outer Diameter : 50 mm

• Aperture Diameter : 12 mm

• Temperature : 90 - 115 K

• Long Term Stability : 25 mK (13 bit

Resolution)

• Mass (w/o contingency) : 0.14 kg (2)

FPU Struts, Filter Wheel, Calibration Source 19

PACS IIDR 01/02 Mar 2001

Assembly

FPU Struts, Filter Wheel, Calibration Source 20

PACS IIDR 01/02 Mar 2001

Baffle

FPU Struts, Filter Wheel, Calibration Source 21

PACS IIDR 01/02 Mar 2001

PT500/1000 Suspension

FPU Struts, Filter Wheel, Calibration Source 22

PACS IIDR 01/02 Mar 2001

Calibration Source Design

• Redundant Heat Source and Temperature

Sensor (PT 100/ PT 500 tbc), 4 wire method

• Aluminum Semispheres Coated with Highly Reflective Surface (Ni, Gold)

• Highly Reflective Scatter Plate (Ni, Gold) with

200 µm rms Surface Roughness

• Collimating Source Mirrors to Increase the Flux

Homogeneity

FPU Struts, Filter Wheel, Calibration Source 23

PACS IIDR 01/02 Mar 2001

ICD Status

ICD Status IF/ EnvelopeDrawing

Comments

Chopper Issue1 YBolometer Issue1 Y Document updatedPhotoconductor,Detectors

Issue 1 Y Document updated

DistributionBoards

Draft Y Document updated

GratingAssembly

Issue 1 Y Book Keeper : CSL

Filter Wheel Draft Y

Filter Draft Y

CalibrationSource

Draft Y