Direct-Drive Motor for Deep-Sea Drilling
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Solution Overview
Problem
Existing electric drilling tools for ocean underwater drilling rigs have complex structures, low efficiency, and poor reliability due to their mechanical speed reducing mechanisms, making them unsuitable for deep-sea operations.
Innovation Solution
An electric drilling tool with a low-speed, high-torque permanent magnet synchronous motor that directly drives the load without a mechanical speed reducer, featuring a segmented stator and rotor assembly for uniform air gaps and a reliable sealing structure, along with a hollow motor design for drilling fluid circulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a mechanical speed reducing mechanism is used in electric drilling tools, then the drilling speed can be controlled, but the structure becomes complex and reliability decreases
Solution Approach 1:
The patent removes the mechanical speed reducing mechanism from the drilling tool structure, extracting the problematic component that caused complexity and reliability issues. The electric motor directly drives the drill bit without intermediate mechanical transmission components, eliminating gears, shafts, and other reducing mechanism parts while maintaining speed control through electrical means.
Solution Approach 2:
The patent replaces the mechanical speed reducing mechanism with an electrical control system. Instead of using mechanical gears and shafts to reduce speed, the system uses electrical motor control to regulate drilling speed, substituting a mechanical system with an electrical one that is more reliable and simpler in structure.
2Speed
If a mechanical speed reducing mechanism is used in electric drilling tools, then speed control is possible, but reliability deteriorates due to wear
Solution Approach 1:
The patent removes the mechanical speed reducing mechanism that was causing wear and reliability problems. By extracting this component entirely, the system eliminates the source of mechanical wear, friction, and potential failure points, thereby improving overall reliability while maintaining speed control through electrical means.
Solution Approach 2:
The patent replaces the unreliable mechanical speed reducing mechanism with a robust electrical control system. The electric motor directly drives the drill bit, and speed control is achieved through electrical regulation rather than mechanical transmission, eliminating wear-related failures and improving system reliability.
3Speed
If a mechanical speed reducing mechanism is used in electric drilling tools, then speed regulation is achieved, but the mechanism is easily worn
Solution Approach 1:
The patent extracts and removes the mechanical speed reducing mechanism that was subject to wear and limited service life. By eliminating this component, the system achieves unlimited service life for the driving mechanism, as the electric motor has no mechanical wear parts in the transmission path.
Solution Approach 2:
The patent replaces the wear-prone mechanical speed reducing mechanism with an electrical drive system. The electric motor directly couples to the drill bit through a simple connection, and speed regulation is achieved through electrical control rather than mechanical gear engagement, eliminating wear and extending service life.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances drilling efficiency and reliability, provides wide speed regulation, strong overload capacity, and high control precision, while simplifying the structure and ensuring operation in harsh underwater conditions.
Implementation Method 1
a motor assembly and a bit assembly. The motor assembly includes a connecting joint, an upper machine head, a motor housing, a stator assembly, a rotor assembly
Implementation Method 2
The motor assembly has a hollow structure vertically penetrating through the motor assembly, which has an upper end connected with coiled tubing through the connecting joint and a lower end connected with the bit through the transition joint
Data Source
AI summary
An electric drilling tool suitable for ocean under rater drilling rig is provided, which belongs to the technical field of ocean drilling equipment and includes a power supply assembly, a motor assembly and a bit assembly. The power supply assembly includes a power distribution cabinet, a power supply cable and a cable plug. The motor assembly includes a connecting joint, an upper machine head, a motor housing, a stator assembly, a rotor assembly, a centering bearing, stabilizing bearings, a rotating shaft, a lower machine head and a protector. The bit assembly includes a transition joint and a bit.