pacs iidr 01/02 mar 2001 fpu struts, filter wheel, calibration source1 d.kampf, dr. roland graue...
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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 8
PACS IIDR 01/02 Mar 2001
Cross section of the motor
123456789
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 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 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
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