Research of torque permanent magnet synchronous motor used in pump jack

Since the normal output is only 20%～30% of the rated power,the efficiency and power factor are low,which results in waste of electric power.To overcome this problem,measures to improve the efficiency,and starting torque and broaden economic operation range for PMSMs are studied,and the corresponding design guidelines are proposed.One 22kW 6-pole high efficiency and high starting torque PMSM prototype was designed and produced.Test results prove that the 22kW 6-pole high efficiency and high starting torque PMSM can replace 37kW 6-pole induction motor used in pump jack.The products have been applied in the oilfield and economical efficiency is remarkable.