Evaporator Condenser Cooling for Elevator Hoisting Machinery
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Solution Overview
Problem
Hoisting machinery for elevators faces challenges in thermal management due to heat generation, which leads to thermal aging and increased size when using more copper or better materials, and larger cooling areas, compromising compactness and efficiency.
Innovation Solution
A free-flowing cooling system with an evaporator part at the stator flange, a condenser part in contact with ambient air, and an expansion tank, allowing heat to be efficiently transferred outside the machinery, preventing overheating without increasing size or cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If more copper is used for windings or better electrical steel is used for the stator core, then heat generation is reduced, but production cost increases
Solution Approach 1:
The invention extracts the heat generation problem from the motor components and transfers it to an external cooling system. The evaporator part removes heat from the stator, separating the thermal management function from the motor structure, thus avoiding the need to use more expensive copper or electrical steel to reduce heat generation internally.
2Loss of energy
If more copper is used for windings, then heat generation is reduced, but the size of the hoisting machinery increases
Solution Approach 1:
The cooling system extracts heat management from the motor internals, allowing the use of standard copper windings without increasing motor size. The evaporator part and cooling medium handle thermal management externally, decoupling heat reduction from volume increase.
3Temperature
If the cooling area is increased to improve natural cooling, then cooling performance is improved, but the size of the hoisting machinery increases
Solution Approach 1:
The invention uses phase transitions of the cooling medium (evaporation and condensation) to achieve efficient heat transfer without requiring large cooling areas. The evaporator part utilizes the phase change from liquid to vapor, and the condenser part uses vapor to liquid transition, providing high cooling performance in a compact form.
4Reliability
If a cooling system is added to improve cooling performance, then thermal aging is reduced, but device complexity increases
Solution Approach 1:
The cooling system is designed to operate automatically using natural convection and phase transitions. The cooling medium circulates through evaporation in the evaporator part, rises to the condenser part, condenses, and returns to the evaporator part without requiring external pumps or complex control mechanisms, thus reducing system complexity while maintaining effective cooling.
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
Improves cooling performance, reduces thermal aging, and maintains compactness by effectively transferring heat from the stator to the outside, avoiding the need for larger cooling areas or expensive materials.
Implementation Method 1
the evaporator part is arranged at the stator flange in a manner to allow the cooling medium to receive heat generated by the stator windings
Implementation Method 2
the cooling medium in the evaporator part evaporates and becomes vaporous cooling medium
Implementation Method 3
the condenser part is arranged at the frame in a manner to be in contact with ambient air
Implementation Method 4
the vapor is cooled in the condenser part and thus condenses to become liquefied cooling medium
Implementation Method 5
the vapor is cooled in the condenser part and thus condenses to become liquefied cooling medium
Data Source
Figure 1
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AI summary
A hoisting machinery (1) for an elevator comprises a frame (2) with a stator flange (3), a stator (4) supported at the stator flange (3), stator windings (5) arranged at the stator (4), and a cooling system having an evaporator part (22), a condenser part (20) and an expansion tank (21), wherein a cooling medium can circulate through the cooling system. The evaporator part (22) is arranged at the stator flange (3) in a manner to allow the cooling medium to receive heat generated by the stator windings (5). The condenser part (20) is arranged at the frame (2) in a manner to be in contact with ambient air. The expansion tank (21) is arranged at the frame (2) in a manner to allow the condensed cooling medium to be collected.