Reel Motor Closed Cooling Circuit for Low-Speed Heat Dissipation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conveyor rollers with integrated electric motors face challenges in heat dissipation due to thermal resistance and contamination issues, leading to reduced efficiency and service life, especially at low speeds and in environments with varying ambient conditions.
Innovation Solution
A roller motor design featuring a closed cooling circuit with a fan wheel generating a cooling air flow that removes heat from the stator and conducts it to the outer housing, ensuring efficient heat dissipation without contamination, using a tubular outer housing and stator housing with radial openings for air flow, and sealing elements to prevent external interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the roller speed is reduced, then the conveying speed is lowered, but the heat dissipation capability deteriorates
Solution Approach 1:
The cooling system dynamically adapts to varying operating conditions by using a fan-driven forced convection system that maintains effective cooling across different conveying speeds. The fan generates sufficient air flow even at low speeds to overcome the thermal resistance in the air gap, ensuring the cooling capability remains effective regardless of the roller's conveying speed.
Solution Approach 2:
The invention employs a pneumatic cooling system where a fan generates a cooling air flow that is directed through the air gap between the roller body and drive unit. This forced air convection eliminates the reliance on natural convection that would be insufficient at low speeds, maintaining effective heat dissipation across the entire operating range.
2Reliability
If the air gap between the roller body and drive unit is increased, then the protection and compact structure are improved, but the thermal resistance increases and heat dissipation worsens
Solution Approach 1:
The invention uses forced convection with a fan to generate a cooling air flow that actively passes through the air gap between the roller body and drive unit. This pneumatic cooling system overcomes the thermal resistance introduced by the air gap, allowing effective heat dissipation while maintaining the protective spacing required for compact and protected structure.
Solution Approach 2:
The invention changes the cooling mechanism from passive natural convection to active forced convection by introducing a fan. This parameter change in the cooling approach allows the system to maintain effective heat dissipation despite the increased thermal resistance from the air gap, enabling both protection and thermal management.
3Temperature
If the roller body is designed open for direct air cooling, then heat dissipation is improved, but contamination from foreign substances and dirt increases
Solution Approach 1:
The invention introduces cooling air as an intermediary medium that is directed through controlled pathways. The fan-generated air flow serves as a mediator that transfers heat from the drive unit to the roller body's outer surface, enabling heat dissipation without requiring the roller body to be open to the environment. This intermediary cooling approach maintains both effective thermal management and protection against contamination.
4Temperature
If the distance between the motor and roller body is reduced, then thermal resistance is lowered and heat dissipation is improved, but manufacturing precision requirements and susceptibility to damage increase
Solution Approach 1:
The invention employs forced convection cooling with a fan to actively transport heat from the motor to the roller body through a controlled air flow. This pneumatic heat transfer mechanism allows the system to achieve effective heat dissipation without requiring minimal spacing between components, thereby maintaining both low thermal resistance and relaxed manufacturing precision requirements.
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 closed cooling circuit maintains consistent temperature and efficiency across varying speeds, reduces contamination risks, and enhances the durability and protection of the roller motor, ensuring reliable operation in diverse environments.
Implementation Method 1
A roller motor design featuring a closed cooling circuit with a fan wheel generating a cooling air flow that removes heat from the stator and conducts it to the outer housing
Implementation Method 2
a cooling air flow that removes heat from the stator and conducts it to the outer housing
Data Source
Figure 1
AI summary
The invention relates to a reel motor (1) for a driven conveyor roller having a stator (11) which is surrounded by a stator housing (10), and a rotor (12) which is driven by a rotor shaft (13), also having a tubular external housing (30) which runs around the state housing (10) at a distance in the circumferential direction, wherein a cooling duct (20), which has a flow connection to an interior, holding the stator (11), of the stator housing (10) is formed between the external housing (30) and the stator housing (10), and an impeller wheel (14) which is secured to the rotor shaft (13) and is designed to generate a cooling air flow (K), wherein the interior of the stator housing (10) and a cooling duct (20) determine a closed cooling circuit through which the cooling air flow is guided.