Mine Hoisting Device Permanent Magnet Motor Explosion Isolation

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Solution Overview

Problem

Existing mine explosion-isolating winches with traditional hydraulic and three-phase asynchronous motor systems have high failure rates and instability due to harsh environments and large loads, compromising reliability and operation stability.

Innovation Solution

A mine explosion-isolating hoisting device with a built-in permanent magnet motor, featuring a spindle, stator, drum, and external rotor with a split structure and cooling apparatus, where the drum is separated from the external rotor by a preset distance to prevent load transfer and maintain an explosion-isolating gap, and includes a cooling liquid pipeline for explosion isolation and a sine-cosine encoder for magnetic pole position detection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional hydraulic or three-phase asynchronous motor systems are used in mine explosion-isolating winches, then the device can operate in harsh environments, but the failure rate is high and reliability is low due to large loads and evil service environments

Engineering Contradiction:

ImprovereliabilityVSAvoidharsh environment impact

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent divides the motor into separate components: the stator is fixed on the spindle while the external rotor is mounted on the drum, connected through isolating discs. This segmentation allows the motor to be designed specifically for explosion-proof requirements while maintaining operational reliability in harsh mine environments.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Isolating discs are introduced as intermediary components between the external rotor and the drum, and between stator and spindle. These isolating structures create sealed compartments that prevent explosive atmospheres from affecting motor internal components, thereby improving reliability in explosive environments.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the drum is directly connected to the external rotor, then the structure is simplified, but the load is transferred to the motor causing instability and poor operation stability

Engineering Contradiction:

Improveoperation stabilityVSAvoidstructural complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The connection between drum and external rotor is segmented through isolating discs, creating independent load paths. The drum rotates on the spindle while the external rotor rotates independently on the drum, preventing direct load transfer and improving operational stability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The load-bearing function is extracted from the motor components by introducing isolating discs and separate mounting structures. The external rotor is mounted on the drum rather than directly on the spindle, removing the motor from the direct load path and eliminating load-induced instability.

Inventive Principle:

Principle #2Taking out (Extraction)

3Volume of moving object

If the radial distance between external rotor and drum inner wall is reduced, then the device size is minimized, but the explosion-isolating gap is compromised

Engineering Contradiction:

Improvedevice sizeVSAvoidexplosion isolation

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

The patent applies different quality requirements to different regions: the explosion-isolating gap between external rotor and drum is maintained at specific distances to ensure safety, while other dimensions are optimized for compactness. This local differentiation allows minimal device size while preserving explosion isolation reliability.

Inventive Principle:

Principle #3Local quality

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

The solution enhances the reliability and stability of the hoisting device by preventing load transfer to the motor, maintaining a stable air gap, and ensuring explosion isolation, thereby improving operational performance and safety.

Implementation Method 1

a permanent magnet motor stator, a drum and a permanent magnet motor external rotor... The permanent magnet motor external rotor is fixed by a spoke plate and rotates relative to the spindle

Methodology Applied

Scientific EffectElectromagnetic interaction: Electromagnetic Induction

Implementation Method 2

a cooling apparatus for cooling the permanent magnet motor stator, the cooling apparatus includes a cooling liquid cavity for accommodating a cooling liquid, and at least one outer wall of the cooling liquid cavity is propped against a stator iron core

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS11242230B2Mine explosion-isolating hoisting device with built-in type permanent magnet motor

Publication Date: 2022.02.08 GUIYANG PLATEAU MINING MACHINERY

AI summary

A mine explosion-isolating hoisting device with a built-in type permanent magnet motor includes a spindle fixed on the ground; a permanent magnet motor stator fixed on the spindle; a drum rotating relative to the spindle, the drum surrounding the spindle circumferentially; and a permanent magnet motor external rotor fixed by a spoke plate and rotating relative to the spindle; the drum is connected to the permanent magnet motor external rotor via an isolating disc; and a radial distance between an outer circumferential surface of the permanent magnet motor external rotor and an inner wall of the drum is greater than a preset value.