Submersible permanent magnet synchronous motor

Abstract

An oil submersible permanent magnet synchronous motor, including a motor housing, in which a stator and a rotor are correspondingly arranged, and the two ends of the motor housing are respectively sealed and connected with other external devices through a coupling device to form an integrated structure The casing assembly; the stator and the rotor are respectively a multi-section stator assembly and a rotor assembly, the stator assembly is fixed on the casing assembly, and the rotor assembly is installed inside the stator assembly; oil is injected into the casing assembly liquid. The present invention adopts the motor housing assembly with an integrated structure, the stator assembly and the rotor assembly with a multi-section structure, and optimizes the electromagnetic scheme by adopting the settings of a 10-pole rotor and a 12-slot stator, thereby improving operational reliability and Motor performance; the hollow main shaft enables oil circulation in the motor cabin, thus solving the problem of heat dissipation; it can realize low speed and high torque, and is suitable for various downhole oil pumping conditions, especially suitable for the screw pump oil pumping environment.

Description

technical field [0001] The invention relates to a submersible permanent magnet synchronous motor, which belongs to the technical field of machinery manufacturing. Background technique [0002] At present, in my country and other oil-producing countries in the world, submersible motors are widely used in oil fields to drive submersible electric pumps to draw crude oil. The electric submersible pump system is an important equipment for oilfield production. The power source of the traditional electric submersible pump system is mainly asynchronous motors. The existing oil production system has the following problems in the oil production supporting process: [0003] First, when the asynchronous motor is matched with a centrifugal pump, the motor efficiency and power factor are low because the motor speed is lower than the synchronous speed; [0004] Second, when the asynchronous motor is matched with the screw pump, because the motor speed is too high, it is difficult to reduc...

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Problems solved by technology

[0003] First, when the asynchronous motor is matched with a centrifugal pump, because the motor speed is lower than the synchronous speed, the motor efficiency and power factor are low;

[0004] Second, when the asynchronous motor is matched with the screw pump, because the motor speed is too high, it is difficult to reduce the speed to the required range of the screw pump through the reducer. Even if the reducer is used, the oil production cost will be greatly increased, and the oil recovery will also be reduced. Efficiency, and directly affects the life of the system;

[0005] The third is that asynchronous motors usually use frequency conversion control. When the AC power on the ground is transmitted to the underground for a long distance, the energy loss is serious, which greatly reduces the motor control accuracy, thereby reducing the system efficiency.

The number of poles of the motor rotor and the number of slots of the stator are too large, which will greatly increase the manufacturing cost. At the same time, it is not an optimal solution from the perspective of the electromagnetic scheme of the motor.

Moreover, the downhole sealing problem and the motor heat dissipation problem are not considered

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