Gearless Hoisting Apparatus Direct Drive Motor Drum
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Solution Overview
Problem
Elevators for drilling rigs are complex, heavy, and labor-intensive to produce and maintain due to numerous moving parts and the need for gears and brakes, which increases production and maintenance costs and wear.
Innovation Solution
A gearless elevator design where the drive motor and drum share a common axis, allowing direct torque transmission without gears, reducing the number of moving parts and simplifying assembly and maintenance, with an optional electromagnetic brake for controlled lowering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If gears and manual transmissions are used to drive the drum, then torque conversion is achieved, but device complexity and weight increase
Solution Approach 1:
The patent replaces the mechanical gear transmission system with an electromagnetic drive system. The electric motor directly drives the drum through electromagnetic forces, eliminating the need for gears, shafts, and other mechanical transmission components. This substitution reduces device complexity while maintaining torque conversion capability through the motor's inherent torque-speed characteristics.
Solution Approach 2:
The patent extracts and removes the gear transmission system from the elevator mechanism. By taking out the manual transmission and gear components, the design achieves direct-drive operation where the electric motor connects directly to the drum, significantly reducing the number of moving parts and simplifying the overall structure.
2Reliability
If multiple brakes and safety devices are added, then safety and control are improved, but device complexity and maintenance requirements increase
Solution Approach 1:
The patent merges the safety brake and working brake functions into a single integrated braking system. Instead of using separate mechanical brakes, the design employs an electromagnetic brake that can operate in different modes to provide both safety functions and controlled lowering, reducing component count while maintaining reliability.
Solution Approach 2:
The electromagnetic brake serves multiple functions: it acts as a safety brake to prevent uncontrolled descent, a working brake for controlled lowering, and can potentially serve as a holding brake. This multi-functionality reduces the number of separate braking components needed while improving overall system reliability.
3Device complexity
If a gearless design with direct motor-drum coupling is used, then device complexity is reduced, but torque multiplication capability may be compromised
Solution Approach 1:
The patent changes the operational parameters of the electric motor to achieve high torque output at low speeds. By selecting a motor with appropriate torque characteristics and operating it in its high-torque regime, the system achieves sufficient torque multiplication without mechanical gears. The motor's torque-speed curve is utilized to provide the necessary torque multiplication effect.
4Adaptability or versatility
If numerous moving parts are used, then functional capabilities are enhanced, but wear and maintenance costs increase
Solution Approach 1:
The patent replaces mechanical transmission components subject to wear (gears, shafts, couplings) with an electromagnetic drive system. The electromagnetic coupling between motor and drum eliminates mechanical contact and friction, significantly reducing wear while maintaining full functional capabilities for torque transmission and speed control.
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 results in a lighter, more compact, and easier-to-transport elevator with reduced production and maintenance time, lower wear, and lower lubricant requirements, while maintaining high torque and force capabilities.
Implementation Method 1
an electromagnetic brake, which brakes the lowering of the drilling device during operation
Data Source
Figure 1
Figure 2a~2b
Figure 3a~3d
AI summary
The invention relates to a hoisting apparatus (10) for moving a load, particularly a drilling device, comprising a drum (24) that can be rotated about the longitudinal axis (X) thereof for winding a flexible pulling means, comprising at least one driving motor (32, 46), which has high torque and is disposed together with the drum (24) on a common axis (Y), the axis in particular being parallel to the longitudinal axis (X), wherein the drum (24) can be driven in a gearless manner by the driving motor (32, 46), and to a method for producing such a hoisting apparatus (10).