Abstract:Reaction flywheel system is the actuator of attitude adjustment for satellite and other spacecraft. At present, the flywheel motor used for satellite attitude control in China is a conventional single-layer magnetic steel flywheel motor. According to the specific performance requirements of flywheel motor in the system, this paper proposes a double-circle magnetic steel flywheel motor and the electromagnetic design and optimization of the motor is carried out, which improves the air gap magnetic flux waveform, torque ripple and increases the output torque and reduces the losses of motor. Firstly, the finite element software is used to simulate the flywheel motor. Then the number of poles and the arc coefficient of the motor are optimized as the size of the flywheel motor is determined. Because the magnetic density produced by the double magnetic steel flywheel motor is more evenly distributed in the air gap than that of the conventional flywheel motor, it is finally compared with the conventional flywheel motor quantitatively. In the end, the double-circle magnetic steel flywheel motor is compared with the conventional one. The results show that the air gap flux density waveform of the double-coil magnet flywheel motor is improved and the torque ripple is reduced. The control accuracy and stability of the reaction flywheel system are improved. The loss of the double-circle magnet flywheel motor is smaller, which enhances the operation efficiency of the motor.