【摘要】 提出了一种异步电机无速度传感器矢量控制的新方法,用瞬时无功功率和励磁电流变化来估计电机转速。该系统建立在同步旋转坐标系下,数学模型较为简单。还为分析系统的稳定性,导出了线性数学模型,并根据零极点轨迹,选择系统的增益,使电机在电动模式或发电模式下都能有较宽的调速范围。最后通过数字仿真验证了系统的可行性。更多还原

【Abstract】 This paper proposes a new method of sensorless vector control for induction motors,in which the motor speed is estimated by both instantaneous reactive power and variation of magnetizing current.The proposed system is constructed in a synchronously rotating reference frame and is very simple.A linear model is deduced to analyze system stability.According to the trajectories of poles and zeros,the system gain is selected to be suitable for operating in a wide speed range and in motoring or regenerating mode.The feasibility of the proposed system is verifed by digital simulation.更多还原