Open-Type Induction Motor Rotor Cooling via Radial Duct Plates
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Solution Overview
Problem
The existing open-type induction motors have low cooling efficiency due to air flowing only in an axial direction through a ventilation hole, leading to increased internal temperatures and high manufacturing costs associated with the use of a ventilation fan, which also generates mechanical loss.
Innovation Solution
The design includes a rotor with iron rotor cores having air holes for axial airflow and duct plates with radially formed blade portions and slit portions that enhance air discharge, eliminating the need for an additional fan by utilizing centrifugal force for air circulation between the rotor and stator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If air flows only in axial direction through ventilation hole, then structure is simple, but cooling efficiency is low
Solution Approach 1:
The patent introduces radial airflow paths through duct plates with radial slots, transforming the cooling system from single-axis (axial) to multi-dimensional (axial + radial) airflow. This enables air to flow through both axial ventilation holes and radial duct slots, significantly enhancing cooling efficiency without excessive structural complexity
Solution Approach 2:
The rotor core is divided into multiple segments with stacked duct plates inserted between laminations. Each duct plate contains radial slots that create segmented airflow paths, allowing air to cool the rotor core from multiple directions simultaneously, improving overall cooling efficiency
2Temperature
If ventilation fan is used to introduce ambient air, then cooling performance is improved, but manufacturing cost increases
Solution Approach 1:
The rotor structure itself serves the dual function of both generating electromagnetic torque and providing cooling airflow paths. The duct plates with radial slots and air holes in rotor laminations create self-cooling capability, eliminating the need for separate ventilation fans and reducing manufacturing costs
Solution Approach 2:
The rotor core is designed to perform multiple functions: electromagnetic torque generation and thermal management. The duct plates and air holes integrate cooling functionality into the rotor structure, making the rotor both the driving element and the cooling system, thereby eliminating additional components
3Temperature
If ventilation fan is driven to cool rotor and stator, then internal temperature decreases, but mechanical loss increases
Solution Approach 1:
The rotating rotor generates its own cooling airflow through centrifugal force and pressure differential created during normal operation. Air is drawn through axial ventilation holes and radial duct slots without requiring external mechanical power, eliminating the mechanical loss associated with ventilation fans
Solution Approach 2:
The patent replaces the mechanical ventilation fan system with a passive fluid dynamics-based cooling system. Instead of using mechanical power to drive airflow, the design utilizes natural convection, pressure differentials, and centrifugal effects generated during rotor rotation to achieve 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
This configuration enhances cooling efficiency, reduces manufacturing costs, and eliminates mechanical losses by automatically introducing ambient air to the rotor and stator, improving motor performance and reducing noise.
Implementation Method 1
utilizing centrifugal force for air circulation between the rotor and stator
Implementation Method 2
a stator positioned to face the rotor and generating magnetism to enable the rotor to rotate
Data Source
AI summary
There is provided an open-type induction motor, and more particularly, to an open type induction motor in which a rotor has a structure allowing air to flow therein, thus enhancing cooling efficiency of the rotor and a stator. The open-type induction motor includes: a stator including an iron stator core having a radial duct hole and a stator coil wound around the iron stator core; and a rotor disposed in a hollow of the stator so as to be rotatable by magnetism generated by the stator coil, and including a rotational shaft, a plurality of iron rotor cores stacked in an axial direction of the rotational shaft and coupled to the rotational shaft, a rotor coil coupled to the plurality of iron rotor cores, and duct plates stacked between the plurality of iron rotor cores and outwardly discharging air present at the inner side of the iron rotor cores.