Hollow cup brushless motor for manicure polishing tool

Abstract

The utility model discloses a coreless brushless motor for a nail polishing tool, which comprises a casing, a front cover and a rear cover, a rotor assembly and a stator assembly are arranged in the casing, the rotor assembly is arranged in the stator assembly in a penetrating manner, and the stator assembly comprises a stator iron core and a three-section coil winding. The three coil windings are arranged in the stator core in a penetrating mode and tightly attached to the inner side wall of the stator core, the central angle of each coil winding is 120 degrees, circumferential symmetry is formed, a single-layer or double-layer varnished wire centralized winding is embedded in each coil winding, varnished wires are spirally wound in the radial direction of a wire cup, and the phase difference between every two adjacent coil windings is 120 degrees. A heat dissipation groove is formed in the bottom of each coil winding, and the end part of each coil winding is arc-shaped. The heat dissipation area is increased through the three-petal symmetrical design, and the temperature rise is reduced through the heat dissipation grooves; vibration noise is low, magnetic field distribution is uniform, and torque pulsation is reduced; miniaturization: the concentrated winding saves space, and meets the requirement for miniaturization of manicure tools; manufacturing is convenient, and automatic winding is facilitated through the modular wire cup structure.