Reaction Wheels

For making changes in the attitude (or position) of the satellites, considering the level of change and its kind, different actuators can be used.
This actuators, by the use of Action and Reaction Principle (Newton’s second principle), can import force to the satellite without relying on any surface.
One of the most important of such actuators is reaction wheels in which the reaction force made because of rotation’s start, rotation’s speed change, or rotation’s stop can be used as propulsion of attitude’s change.
Due to the country’s need and in order to achieve to the designing and manufacturing technology of such actuators, Space Research Laboratory has begun designing and making samples of such actuators in order to be used in micro level satellites.
Manufactured models are RW1800, RW1900, RW2000 and RW2100 whose mechanical properties are mentioned in the following table.

Reaction wheels are made up of different parts including: disc, rotor, stator, installation base, driver and encoder.
The disc is used in order to provide rotator inertia. Rotor and stator are used in order to connect the disc to the driver. Driver’s task is rotating rotor with a definite speed. The encoder measures the rate of rotation speed changes and it also gives feedback to the driver.

  • It can be used as attitude control actuator on satellites

  • Different control algorithms can be tested by using it

  • The possibility of installing and testing on “HAGH 100” & “HOJAT 100” systems

  • The possibility of controlling and programming of the changes in rotation rate

  • Smaller dimensions and lower weight in recent samples

Reaction Wheel (RW 2100)
Performance
Angular Momentum 3.8 N.m.s
Nominal Rotation Speed 4000 rpm
Max. Rotation Speed 6000 rpm
Nominal Torque 0.40 N.m
Mechanical
Disk Mass 2 kg
Dimension Ф160*47.6mm
Moment of Inertia 0.0009kgm²
Mechanical Power 85 W
Electrical
Voltage 18-24V
Type of plug Micro-D 15 Female
Data Interfaces RS 485 with ASCII or Binary Protocol
Power Consumption
Stand By 1.1W
Max Torque 100W
General
Operation temperature range -40 to +85
Storage Temperature -50 to +90
Reaction Wheel (RW 2000)
Angular Momentum 0.35 N.m.s
Nominal Rotation Speed 6000 rpm
Max. Rotation Speed 7500 rpm
Nominal Torque 0.012 N.m
Mechanical
Mass 0.8 kg
Dimension Ф100*62m
Moment of Inertia 4*10^(-4)kgm²
Mechanical Power 18 W
Electrical
Voltage 18-24V
Type of plug Micro-D 15 Female
Data Interfaces RS 485 with ASCII or Binary Protocol
Power Consumption
Stand By 1.1W
Max Torque 22W
General
Operation temperature range -20 to +50
Storage Temperature -30 to +60
Reaction Wheel (RW 2200)
Angular Momentum 5.5*10^(-4) N.m.s
Nominal Rotation Speed 8000 rpm
Max. Rotation Speed 16000 rpm
Nominal Torque 22*10-10 N.m
Mechanical
Mass 0.4 kg
Dimension Ф50*35m
Moment of Inertia 700gmm²
Mechanical Power 0.65 W
Electrical
Voltage 12V
Type of plug Micro-D 15 Female
Data Interfaces RS 485 with ASCII or Binary Protocol
Power Consumption
Stand By 0.5W
Max Torque 0.75W
General
Operation temperature range -20 to +50
Storage Temperature -30 to +60

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Contact Info

Space Research Laboratory, Aerospace Engineering Faculty, K. N. Toosi University of Technology, Daneshgah Blvd., Ehsan Exit, East Zeynoddin Highway, Tehran, Iran

Phone: +98 21 77334133

Fax: +98 21 73064234

Web: Spacerl

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