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Reaction Wheel Assenmbly Type L-A

Reaction Wheel Assenmbly Type L-A
Registration date 2/2/2015
JAXA development group Research Unit I, Research and Development Directorate
View diagram See Attachment 1
Environmental resistance See Attachment 2
Patent number
(publication number)		 N/A
Reference N/A
Satellite and launch date will be launched on ASTRO-H (2015)
Note N/A
Manufacturer

Mitsubishi Precision Company, Limited
Kamakura-shi, Kanagawa, Japan
https://www.mpcnet.co.jp/e/index.html

Features

The new reliable low-disturbance reaction wheel assembly Type L-A (large size) was developed based on original Type L. The major design modifications are improvement in output torque from 0.1 Nm (Type L) to 0.2 - 0.4 Nm (Type L-A), and improvement in mechanical environment tolerance for random vibration.

Applications

Reaction wheel is an attitude control actuator for 3-axis stabilization of spacecraft.
Type L-A covers a storage momentum range from 10 Nms to 80 Nms for large- and medium- size spacecraft.

Specifications

Item Specification Remarks
Momentum (Max.) 10 - 80 Nms Depending on 9 types
Output torque (Max.) -6000 rpm - +6000 rpm : >0.2 Nm or
-3500 rpm - +3500 rpm : >0.3 Nm or
-2000 rpm - +2000 rpm : >0.4 Nm 		Depending on 9 types
Speed range -6000 rpm - +6000 rpm or
-3500 rpm - +3500 rpm or
-2000 rpm - +2000 rpm 		Depending on 9 types
Run-up time 25 s - 400 s
  1. 0 to max. speed @max. output torque
  2. Depending on 9 types
Coast-down time 238 s - 1967 s
  1. Max. speed to 100 rpm @motor off
  2. Depending on 9 types
Power consumption Peak torque <230 W @max. speed and max. output torque
Steady state 18 W - 35 W
  1. @max. speed and 0 Nm
  2. Depending on 9 types
Disturbance force / torque force <2 × 10-2 N [0.1<10 Hz]
<2 × 10-4 × f2 N [10 to 100 Hz]
<2 N [100<200 Hz]
 f : frequency
torque <4 × 10-3 Nm [0.1<10 Hz]
<4 × 10-5 × f2 Nm [10 to 100 Hz]
<4 × 10-1 Nm [100<200 Hz]
Bus voltage 30.0 - 52.0 Vdc -
Vibration Sine : 196.1 m/s2 (20 G)
Random : 159.4 m/s2 rms (in-plane),
195.9 m/s2 rms (out-of-plane) 		-
Temperature range Operation : -5 - +60 °C
Turn-on : -15 - +60 °C
Non-operation (storage) : -30 ? +70 °C 		-
Life On ground
and storage		 >5 years -
On orbit >10 years -

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