Inner shell circulating air-cooled outer rotor brushless DC motor

Abstract

The invention proposes a housing internal circulation air-cooled external rotor brushless direct current motor, which relates to a motor and comprises a stator component and a rotor component. Between the stator component and the rotor component, a maze-type sealing structure is utilized. The rotor housing of the rotor component is provided with an internal fan blade on the inner side in the radial direction. The radial outer side of the rotor iron core of the rotor component is provided with a heat radiation boss. When the rotor component is assembled, the radial outer surface of the heat radiation boss is located on the radial outer side of the rotor housing; the rotor iron core is provided with an iron core air channel. When the motor runs, the internal fan blade generates internal circulation cooled air which circulates and flows in the internal cavity of the rotor along the iron core air channel and the gap between two adjacent stator windings; and the internal circulation cooled air generated from the internal fan blade transmits the heat generated by the stator windings to the rotor iron core in a convection manner, and then, the heat is spread to the radial outer surface of the heat radiation boss in the conductive manner, and finally, through the cooled air generated by the internal fan blade, the heat transmitted to the radial outer surface of the heat radiation boss is brought away.

Description

technical field [0001] The invention relates to a brushless DC motor with an inner circulation air-cooled outer rotor, which relates to a motor, in particular to a brushless direct current motor with an inner circulation air-cooled outer rotor. Background technique [0002] Ordinary external rotor brushless DC motors are mostly used in small ventilation fans in industrial plants or commercial places, as well as miniature ventilation fans used in ventilation and cooling of computer and electronic equipment chassis. The modes of heat transfer are conduction, convection, and radiation. For the motor, the heat generated by the stator winding of the open fan cooling motor is mainly dissipated by convection, and the cooling air generated by the fan takes away the heat generated by the stator winding, and the heat dissipation efficiency is high. The disadvantage is that dust can enter the inner cavity of the motor, which cannot meet the design requirements of waterproof, dustproof...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of ordinary outer rotor brushless DC motors adopting a semi-closed structure, that is, it is impossible to prevent dust from entering the motor inner cavity, and it is not conducive to the heat dissipation of the motor stator windings, and to provide a shell-in-shell circulating air-cooled outer rotor brushless motor. DC motor, while preventing dust from entering the inner cavity of the motor, it can also improve the heat dissipation efficiency of the stator winding of the motor

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