Underground brushless DC motor controller

Abstract

The invention relates to an underground brushless DC motor controller, which comprises a main power supply, wherein the output end of the main power supply is respectively connected with an auxiliary power supply and a three-phase fully controlled bridge module, and the auxiliary power supply converts high voltage output by the main power supply into low voltage and supplies power to a power switch tube driving module and a main controller; the three-phase fully controlled bridge module is connected with the main controller through the power switch tube driving module; a detection circuit module is used for detecting a position rotating speed signal and a current signal of a brushless DC motor and transmitting the detection signals to the main controller and a storage unit module, and data stored in the storage unit module is transmitted to the main controller according to a calling instruction of the main controller; the main controller inputs six paths of PWM (Pulse Width Modulation) control signals to the power switch tube driving module according to the received position rotating speed signal and current signal of the brushless DC motor, and the power switch tube driving module processes the six paths of PWM control signals and controls the three-phase fully bridged module to work; and the main controller is also connected with a communication module. The invention can be widely applied to underground tools of an oil well.

Description

technical field [0001] The invention relates to a motor controller, in particular to a downhole brushless DC motor controller used in oil well downhole tools. Background technique [0002] In the downhole, a hydraulic telescopic mechanism is usually used to pump formation fluid, and the direction of hydraulic oil is controlled by a hydraulic reversing valve. Although the solenoid valve is convenient to control, due to the limitation of space, the force generated by the solenoid valve may not be enough to push the valve core, so a motorized hydraulic valve is considered. The motor drives the lead screw nut to push the valve core, and after deceleration drives the lead screw to rotate and drive the valve core to move to realize the control of the hydraulic valve. With its advantages of high reliability, good controllability, high efficiency, small size, long life and strong overload, the brushless DC motor is suitable for the harsh working environment in the mine and is used ...

AI Technical Summary

Problems solved by technology

However, the existing brushless DC motor controllers currently on the market have the following deficiencies: 1. The size is relatively large and cannot meet the internal space requirements of downhole drill pipes

2. The application environment is limited, and it cannot adapt to harsh working environments such as high temperature, high pressure, and strong vibration underground, and the safety and reliability are poor.

3. The control function is limited, and it needs to be reconfigured according to the requirements of the downhole control system, and the specificity is poor

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