External rotor motor

Abstract

The invention relates to an external rotor motor. A rotor shell is internally and fixedly provided with a plurality of permanent magnets which are the same tile-shaped hexahedral structures and are regularly arranged along a circumferential direction and an axial direction. A plurality of permanent magnets are arranged in any circumferential and any axial direction. Two circumferential side faces of the permanent magnets are inclined plane shapes with inside cutting angle shapes, and the angle of a cutting angle is 5 degrees to 35 degrees. The outer edge of a permanent magnet cross section in a radial direction is a circular arc line shape whose center is at the axis of the rotor shell. The inner edge of the permanent magnet cross section in a radial direction is a single arc shape or a curved line formed by connecting a plurality of arc shapes mutually. The permanent magnets are made of high performance NdFeB materials, the lengths of the permanent magnets are between 30mm and 95mm, and the thicknesses of the permanent magnets are between 8mm and 18mm. The external rotor motor has the advantages of good stability, small vibration, low noise and high power in low-speed operation and is especially suitable for a drum direct drive crane lifting mechanism and the like.

Description

technical field [0001] The invention relates to an outer rotor motor, in particular to a low-speed, high-torque outer rotor permanent magnet synchronous motor. Background technique [0002] The existing outer rotor permanent magnet synchronous motor usually includes an outer rotor and a stator located inside the outer rotor, the stator is fixedly installed on the central shaft, and the two ends of the outer rotor are fixedly connected with fixed disks, and the fixed disks pass through The rotor bearing is rotatably connected with the central shaft. The outer rotor includes a cylindrical rotor shell and permanent magnets fixed in the rotor shell. The stator includes a stator core made of stacked punched iron core pieces and embedded in The winding on the stator core is connected to the AC power supply in a certain way. When the winding is energized, a rotating magnetic field is generated to interact with the permanent magnet on the outer rotor, driving the outer rotor to rota...

AI Technical Summary

Problems solved by technology

However, since the excitation magnetic field of the permanent magnet rotor or the stator winding is not an ideal sinusoidal distribution, there will be obvious pulsating torque when running at low speed (including ultra-low speed), which will affect the stability of the motor operation, large vibration, high noise, and serious hampers its use at low speeds

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