Monorail Hoist Robot Motor Control for Multi-Drive Synchronization
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Solution Overview
Problem
Lithium battery monorail hoists in coal mines face issues of asynchronous operation due to varying load conditions and wheel-spinning, leading to inefficiencies and reduced power capacity, especially under heavy loads and changing conditions like climbing or descending slopes.
Innovation Solution
A monorail hoist transportation robot equipped with a state perception system and permanent magnet motors, which adjusts operation modes (constant power or torque) based on real-time conditions, using sensors and controllers to synchronize driving units and manage wheel abrasion, ensuring stable operation and synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If lithium battery monorail hoist uses multiple driving units to compensate for lower power density, then the power capacity is improved, but the asynchronous operation problem occurs under varying load conditions
Solution Approach 1:
The patent implements dynamic adjustment of motor operating modes (constant torque mode and constant power mode) based on real-time detection of traveling state by the state perception system. This dynamic control strategy ensures synchronous operation of multiple driving units under varying load conditions while maintaining the power capacity provided by multiple units.
2Ease of operation
If different drive wheel diameters are used to prevent wheel-spin under different operation conditions, then the wheel-spin problem is improved, but the asynchrony among driving units is worsened
Solution Approach 1:
The patent uses parameter changes in motor control (switching between constant torque mode and constant power mode) rather than physical changes in wheel diameters. The state perception system detects traveling state and the main controller adjusts motor parameters to prevent wheel-spin while maintaining synchronous operation of all driving units with identical wheel diameters.
3Power
If more driving units are utilized to compensate for insufficient lithium battery power, then the power deficiency is improved, but the device complexity is worsened
Solution Approach 1:
The patent merges the control of multiple driving units under a unified control system with centralized state perception and coordinated control. This integration manages the complexity of multiple driving units by coordinating them as a unified system, reducing operational complexity while maintaining the power output benefits of having multiple units.
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
Enhances operational synchronization and efficiency by adapting to changing conditions, extending the service life of the monorail hoist by managing wheel abrasion and maintaining consistent performance across varying loads and terrains.
Implementation Method 1
Each driving unit includes a permanent magnet motor
Implementation Method 2
a monorail hoist transportation robot driven by permanent magnet and variable frequency of an explosion-proof lithium battery
Data Source
AI summary
A monorail hoist transportation robot driven by permanent magnet and variable frequency of an explosion-proof lithium battery includes a state perception system and a cockpit, a lifting device, a power carriage and a plurality of driving units all suspended on the suspension track. Each driving unit includes a motor, and each motor has the operation modes including a constant power mode and a constant torque mode. The main controller is configured to obtain the travelling state of the monorail hoist transportation robot through the state perception system, and adjust the operation mode of the motor according to the travelling state.