Column Type Coreless Motor Heat Dissipation and Weight Reduction
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Solution Overview
Problem
Traditional motors with silicon steel sheets and coil windings suffer from significant weight, iron loss, heat dissipation issues, and complex assembly processes, limiting their efficiency and endurance, making them unsuitable for modern electric tools and garden equipment.
Innovation Solution
A column-type coreless motor with a U-shaped annular groove rotor, permanent magnets, and a heat dissipation fan, combined with a stator made from thermosetting materials and enameled wires, reduces weight and heat loss, and simplifies assembly by using a clamp sleeve structure and vane-type heat dissipation air passage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If traditional motors use silicon steel sheets and coil windings, then the motor structure is established, but the weight increases and iron loss occurs
Solution Approach 1:
The patent removes the iron core (silicon steel sheets) from the motor structure, creating a coreless motor design. This extraction eliminates the source of iron loss and significantly reduces motor weight while maintaining the functional structure through alternative materials and design configurations
Solution Approach 2:
The patent employs composite material construction, combining non-magnetic materials with magnetic components. The motor uses a composite structure with a non-magnetic coreless rotor body, permanent magnets, and specialized winding materials to achieve both weight reduction and energy efficiency
2Power
If traditional motors operate at high speed, then power output increases, but heat generation increases and reliability decreases
Solution Approach 1:
The patent converts the harmful heat generated during high-speed operation into a manageable thermal management challenge by designing integrated heat dissipation pathways. The heat dissipation fan and air passage system transform thermal energy into controlled airflow, preventing overheating while maintaining high power output capability
Solution Approach 2:
The patent introduces a heat dissipation fan as an intermediary component between the heat-generating coil and the external environment. This fan mediates thermal management by actively circulating air through designated passages, ensuring reliable operation during high-power conditions
3Force
If permanent magnets are installed on the rotor, then magnetic field strength increases, but centrifugal force causes magnets to detach
Solution Approach 1:
The patent transitions from a conventional radial magnet arrangement to a three-dimensional embedded magnet structure within the coreless rotor. By distributing magnets in multiple spatial dimensions and embedding them within the rotor body rather than mounting on the surface, the design resists centrifugal detachment forces while maintaining magnetic field strength
4Temperature
If a heat dissipation system is added to the motor, then heat dissipation improves, but device complexity increases
Solution Approach 1:
The patent merges the heat dissipation function with existing motor components rather than adding separate independent systems. The heat dissipation fan is integrated with the rotor assembly, and air passages are incorporated into the housing structure, combining thermal management with mechanical components to minimize overall complexity
5Ease of manufacture
If the motor uses a modular assembly mode, then assembly convenience improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent divides the motor into distinct modular components including the coreless rotor assembly, stator, housing, and heat dissipation system. Each module can be manufactured and assembled separately, improving ease of manufacture while standardized interfaces maintain required precision
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 motor achieves high efficiency, reduced noise, and increased reliability with improved heat dissipation and modular assembly, enhancing power and durability for electric tools and garden equipment.
Implementation Method 1
a column type coreless motor comprises a body composed of a motor housing, a rotor and a stator. The rotor is manufactured into a column type structure with a U-shaped annular groove, and may be made of high-strength iron materials, effectively ensuring a rotational inertia of the motor. An inner side surface of the U-shaped annular groove may be evenly provided with several pairs of permanent magnets
Implementation Method 2
A heat dissipation air passage is ingeniously arranged in the housing structure, and discharges effectively therefrom heat generated by the motor coil through an action of the fan
Data Source
Figure 1~2
Figure 3(a)~4
Figure 5~6
AI summary
A column type coreless motor is provided. The novel motor comprises a stator, a rotor and a motor housing, wherein the designed rotor is a column type structure with a U-shaped annular groove, the stator is placed in the U-shaped annular groove of the rotor, the stator is made by solidifying a coil therein with a thermosetting material through a pressure device, the coil is wound by combining multiple enamelled wires into a phase line; successively superposing three-phase lines; and winding each phase line in a toothed circle shape, and the novel motor has no iron loss, low heat loss and high efficiency. Further, the rotor is provided with a heat dissipation fan, the fan discharges the heat generated by the coil out of the motor through a heat dissipation air passage in the motor housing, effectively ensuring the heat dissipation effect of the motor.