SPACEBUS G3 SLIPRING AND SENSORS

Competitiveness & Growth

Status

Ongoing
Status date

2016-09-08

Objectives

The Slipring is developed to be used in the new generation of SpaceBus Solar Array Drive Mechanism (SADM), for Thales Alenia Space platform.

The main challenges for the slipring were:

• the increase of power transfer capacity (16.5 kW à 27kW)

• The limited volume and length available

• The improve of the thermal design

The Angular Sensor was developed considering the following:

• Directly integrated on the rear side of the SlipRing

• Use reliable technologies for tribological contacts

• include both digital and analogic channels

Challenges

AAS:

The design of the AAS is based on single brush/track contacts therefore the AAS design is sensitive to glitches issue. The AAS design must be modified in order to address efficiently the glitch issue

The AAS is not qualified today, but the work has been done according the initial plan and the qualification results are satisfactory in some parts. The glitches issue is the main cause of the functional tests failure during the qualification. Thanks to RUAG’s investigation, the phenomenon is better understood and design improvement have been proposed for the potential new generation of AAS

SRC:

The acceptance tests performed at RUAG have successfully demonstrated the G3 SRC QM performances. All the results were in the expected range and compliant

Benefits

SRC.

Compact slipring with high power capacity
Optimized in mass and volume
Plug& Play solution (connectors integrated)

Features

SRC performance:

	Power forward lines	Power return lines	Signal lines	Grounding lines
Number	25	5	24	3
Current [A RMS]	9	45	1	1
Voltage [V]	120	120	120	-

Properties	Unit	Value
Mechanical configuration	-	Cylindrical slipring Bearing less with plain bearing at rotor end
Housing diameter	[mm]	97
Overall diameter (Connector plate)	[mm]	222
Length	[mm]	162.5
Maximum mass	[kg]	4.35
Power transfer	[kW]	27
Maximal heat dissipation	[W]	52
Qualification temperature range	[°C]	-50 ≤…≤ 140
Lifetime	years	18

AAS performances:

	Description	Unit	Nominal value	Tolerances
Nominal
Channel 1	Step size	[°]	180	±0.5
	Angular deviation of electrical zero wrt. Mechanical zero at delivery	[°]	0	±0.2
	repeatability	[+/-°]	0	±0.094
Channel 2	Step size sectors	[°]	5, 9, 11	±0.13
	Angular deviation of CH2 electrical zero wrt. CH1 electrical zero	[°]	0	±0.2
	repeatability	[+/-°]	0	±0.106
Channel 3	Step size	[°]	5	±0.15
	Angular position of CH3 electrical zero wrt. CH1 electrical zero	[°]	182.5	±0.614
	Repeatability	[+/-°]	0	±0.111
Redundant
Channel 1	Step size	[°]	180	±0.5
	Angular deviation of electrical zero wrt. Mechanical zero at delivery	[°]	0	±0.2
	Angular deviation of redundant electrical zero wrt. nominal electrical zero	[°]	0	±0.4
	repeatability	[+/-°]	0	±0.139
Channel 2	Step size sectors	[°]	5, 9, 11	±0.13
	Angular deviation of CH2 electrical zero wrt. CH1 electrical zero	[°]	0	±0.4
	repeatability	[+/-°]	0	±0.13
Channel 3	Step size	[°]	5	±0.15
	Angular position of CH3 electrical zero wrt. CH1 electrical zero	[°]	182.5	±0.614
	repeatability	[+/-°]	0	±0.149