海洋二号（HY-2A）卫星要求微波散射计和微波辐射计实现扫描过程中所产生的力矩波动不能影响卫星姿态稳定度。这两个载荷使用永磁同步电动机矢量控制，对负载直接驱动；通过电机本体采用齿槽转矩优化设计、采用固定角度计时法消除量化误差、相电流测量误差控制、逆变器死区补偿等措施，抑制转矩波动。通过电机本体和控制策略进行联合精确模型仿真，分析了系统的转矩波动。由在轨遥测数据分析可得，实现了大惯量旋转部件的精确控制。

Taking into account attitude stability，microwave scattermeter and microwave radiometer while rotating need to reduce torque ripple. Permanent-magnet motors using vector control technique are used to drive directly both sensors. Restraining cogging torque of motor， eliminating quantization error with fix angle timing，compensating dead time，these are presented. The control system and motor has been simulated by accurate model，results show that the torque ripple is reduced. The orbital attitude speed results are presented to validate this scheme.