الفهرس 
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Abstract
lywheel power systems are now seen as a technology that can be used in
various applications, including low-earth space satellite orbits, pulse
transmission for hybrid electric vehicles and many other applications. In
consideration of the energy storage feature, a flywheel device has great
advantages over chemical batteries for Low Earth Orbit (LEO) satellites:
lifespan, density of power, short charge time, wide operational temperature
band, and deep depth of discharge. Flywheel systems have significant
advantages over chemical batteries also it can be used to control the
spacecraft attitude. The combination of energy and attitude control is a
reasonable solution to improve space missions for satellites. Double
counter-rotating flywheels mounted on an air table are introduced in this
thesis to execute the control system of combined power and single axis
attitude control. The system control technique of integrated power and
attitude control could be implemented based either on a speed control
mode or on a torque control mode. The control algorithm’s method is field
orientation control. This method offers the flywheel motor / generator with
precise and high bandwidth torque control by controlling rotor reference
frame currents that are dc in steady-state. The Permanent magnet
synchronous motor/generator is controlled by the direction of the field. The
current rotational frame of the d-axis is ordered to zero and the q-axis
current component changes to maintain the required dc bus level and
commanded attitude angle. MATLAB Simulink was used to model the
combined power and single-axis attitude control system using two similar
flywheels. Furthermore, different cases and different modes of operation are
presented which showed that flywheels behavior changed according to
different operation.