【摘要】 以异步电动机机械特性曲线为基础,分析了变频调速异步电动机在拖动恒转矩负载、恒最大转矩负载、变转矩(非风机和泵类)负载、恒功率负载以及风机和泵类负载时,转差率随频率变化的规律.给出了在不同性质的负载和频率条件下,电动机的转差率和转速的计算公式.研究表明,变频调速电动机的转差率随频率的变化而变化.本研究的结论否定了变频调速电动机转差率不变的观点.更多还原

【Abstract】 Based on the torque-speed characteristic curve of induction motors,analyses were done on changes in slip with an variation in frequency when an induction motor drives different kinds of loads,including those with constant torque,constant-maximum torque,variable torque(except fans and pumps) and constant power,as well as fans and pumps.The formulas to calculate the slip and the speed under different frequencies and loads were presented.The analyses show that slip changes with an change in frequency for an induction motor with frequency speed control.This conclusion does not support the viewpoint that the slip of an induction motor with frequency speed control is constant.更多还原