Cho động cơ có Z=24 rãnh, 2p=4 cực. Vẽ sơ đồ khai triển dây quấn động cơ kiểu đồng tâm hai mặt phẳng, q tập trung, đầu vào các pha liên tiếp lệch 1200 điện.

Amixture of slurry and mud is to be pumped through a horizontal pipe of diameter 500 mm. the fluid behaves as a bingham plastic with a yield stress of 30 pa and viscosity 0.04 pa.s. describe the effects of the shear stress through a transverse section of the pipe by plotting the variation in shear stress and velocity profile: (i) just before the slurry starts to move (ii) as the slurry flows when the pressure gradient is double that in part (i)