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1 Introduction Withthedevelopmentofthefrequencyconversiontechnology ,thefrequencyconvertersareextensivelyemployedinVVVFdrivesystems.Theyareusedtorealizesoftstartingoftheinductionmotor ,whichisoneoftheiradvantages.Nevertheless,inpractice ,thein verter moto… 相似文献
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教学活动中经常用测验来了解教学效果,每次测验都要对学生的心理产生一系列的影响,一次好的测验不仅可以为教师和学生提供积极的信息,而且也能对学生的心理产生积极的影响,使学生提高自信心,突出自我形象,强化自我观念,激发学习兴趣。而一次失败的测验往往在学生的心理上产生不良的影响。了解学生对测验成绩的心理承受能力,对教学改革和教学实践都有积极的意义。…… 相似文献
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Influence of PWM Modes on Commutation Torque Ripples in Sensorless Brushless DC Motor Control System
This paper introduces four PWM modes used in the sensorless brushless DC motor control system,analyzes their different influences on the commutation torque ripple in detail,and selects the best PWM mode in four given types to reduce commutation torque ripple of Brushless OC( BLDC) motors,Simulation and experimental results show that the selection is correct and practical. 相似文献
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