Protection method and stand structure of oil field DC motor

Abstract

The invention relates to a protection method and a stand structure of an oil field DC motor; an oil well drilling rig uses a DC motor stand and adopts an all-lamination structure, reduces the eddy in a stand magnetic yoke by changing the resistance of stand laminations, so that the flux changes in the stand magnetic yoke follows the magnetic potential changes, an originally balanced commutating electric field of the motor is not damaged in a transition process, so as to significantly reduce the commutating sparks in the transition process of the motor and in pulse flow, and effectively improve the anti-explosion performance of the motor. The stand of the motor is in the all-lamination structure, and comprises the stand magnetic yoke; the stand magnetic yoke is formed by axially laminating a plurality of pressed layers of 1 to 1.5mm steel sheets; symmetric equalization positions on the inner side of the stand magnetic yoke are provided with a plurality of positioning grooves for fixing main pole iron cores; both ends of the stand magnetic yoke are provided with pressing rings for pressing; the two pressing rings are connected by 4 to 8 rib webs with equal spacing; and the stand magnetic yoke is extruded between the pressing rings on both ends.

Description

technical field [0001] The invention relates to a motor protection method and component structure, in particular to a method for preventing commutation sparks during the transition process and pulse flow of the motor, and a magnetically conductive yoke structure for a DC motor base used in an oilfield environment. It is mainly suitable for use in DC motors for oil well drilling rigs. Background technique [0002] Since the beginning of the new century, my country's oilfield mining industry has developed rapidly, and the demand for DC motors for oil well drilling rigs is huge. Because there are a lot of flammable and explosive gases in the oil field environment, which belongs to the explosive hazardous area, for the sake of safety, the electrical products used in the oil field environment must determine the explosion-proof requirements according to the level of the explosive hazardous area according to the requirements of the relevant state departments; The higher the explos...

AI Technical Summary

Problems solved by technology

At present, the DC motors widely used in domestic oil fields have an integral solid structure, which is easy to generate eddy current when the magnetic flux in the magnetic yoke changes, so that the change of the magnetic flux lags far behind the change of the magnetic potential, so that the motor The change of the commutation pole magnetic flux in the transition process lags far behind the change of the commutation pole current, so that the originally balanced commutation magnetic field of the motor becomes unbalanced, resulting in commutation sparks in the motor transition process, and there is a motor transition process The explosion-proof safety hazard of reversing sparks easily appears in the motor, which affects the overall explosion-proof performance of the motor. For this kind of operation, reversing sparks are easily generated in the motor, which is a dangerous hidden danger, and it is necessary to improve this

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