Most small wind turbines use permanent magnet (PM) generators. The generators are usually direct-drive (i.e., no gearbox is required). Direct-drive PM generators are characterized by low maintenance and high efficiency. Small wind turbines are usually self-starting and require very simple controls. Cogging torque is an inherent characteristic of PM generators and is caused by the geometry of th...

Due to harmonics, sudden voltage dips and large fluctuating torque causes a great problem in the starting of large induction motor. Some times due to tripping of relay, equipment failure, surge, no load or overload motor voltage fluctuates resulting in the failure of motor starting. This paper discusses the solution of these problems by using soft starter technique. Soft starting of induction m...

introduction: the purpose of this study was to compare the accuracy of the torque wrenches used in different dental implant systems. methods: we evaluated 42 torque wrenches used in different dental clinics in mashhad, iran, using a digital torque meter (mark 10). high (25, 30 and 35 n·cm) and low (15 n·cm) levels of torque were examined. ten tests were performed on each wrench, and the mean va...