High torque permanent magnet low rotating speed direct-drive oil extractor motor

Abstract

The invention discloses a high torque permanent magnet low rotating speed direct-drive oil extractor motor, comprising a permanent magnet system, an armature and an air gap; the main magnetic field flux formed by permanent magnetic poles is in radial direction; an armature winding is multiphase symmetrical concentration winding; the relational expression between the pitch t of an armature core andthe polar distance tau of the permanent magnetic poles is as follows: mkt (mk+ / -c) tau / d, wherein, d is 1 or 2, when d is equal to 1, c is more than and equal to 2 and less than or equal to 0.15mk; when d is equal to 2, c is more than and equal to 1 and less than or equal to 0.15mk; m is equal to 3n, and m is the phase number of the motor; the tooth number of the armature core z is equal to mk; the number of poles of the permanent magnetic poles 2P=(mk+ / -c) / d, wherein, 2P is more than or equal to 16; n, k, c and P are selected from natural numbers; k coils in phases are divided into c groupsof downlinks, and each group has k / c coils in average. The materials of the motor provided by the invention have higher utilization rate, shorter winding head, smaller volume, lighter weight and higher efficiency, and are more stable when running in low speed; the transmitted torque can reach more than ten kilo N.m, thus better meeting the requirements of a large-scale low rotating speed direct-drive oil extractor.

Description

technical field [0001] The invention belongs to oil pumping equipment for oil wells, in particular to a high-torque permanent magnet low-speed motor used in direct-drive pumping units. Background technique [0002] Petroleum, as the main energy source for the operation of the national economy, has become the lifeblood of the country's development, and the improvement of oil extraction technology has become the main subject of our country's solution to the energy crisis. At present, the traditional pumping units used in this industry all need to use the reducer with a large speed ratio to reduce the speed, and the structure of the high-torque gear reducer is very complicated, the life of the whole machine is short, the weight is large, the maintenance cost of the equipment is high, the reactive power loss is large, and the energy The conversion efficiency is low. [0003] In order to solve the above problems, some solutions have been proposed in the prior art, such as the CN...

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Problems solved by technology

[0005] On the one hand, the present invention solves the problems of low reliability of the complete machine and high equipment maintenance cost caused by the complex structure of the traditional pumping unit, as well as the low utilization rate of the magnetic steel and the heavy weight of the complete machine in the prior art; on the other hand, it solves the problems of It solves the problems of long winding ends, large copper consumption, complex insulation structure and high cost of traditional permanent magnet motors, and provides a high-torque permanent magnet low-speed direct-drive pumping unit with high reliability and low equipment maintenance costs. motor

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