Permanent Magnetization Transformation and Performance Analysis of Small Power Three Phase Asynchronous Motor

Abstract

Oilfield pumping units are the main production machinery in the oilfield, and the electricity consumed accounts for about 60% of the oilfield’s electricity consumption. The requirements of the pumping unit for the electric motor are high starting torque, high efficiency, and a wide economic operating range. If an induction motor is used, in order to meet the requirements of high starting torque of the pumping unit, it is necessary to configure a large capacity induction motor. However, during normal operation, the average load rate is low, mostly under light or no-load operation, the efficiency and power factor are low, resulting in a large amount of waste of electrical energy. In this paper, the permanent magnetization of the induction motor is proposed. The stator remain unchanged, only grooves (straight/inclined) are cut on the outer surface of the rotor to place permanent magnets. The original asynchronous motor is converted to a permanent magnet motor. It can be used in actual oilfield exploitation engineering.