Coreless Armature Inner and Outer Rotor Brushless DC Permanent Magnet Motor

Abstract

The invention discloses a moving-coil brushless DC (direct-current) permanent magnet motor with an inner and outer rotor structure. The moving-coil brushless DC permanent magnet motor comprises a shaft assembly and a moving assembly, wherein the shaft assembly comprises a rotating shaft, bearings, a first end cover, a moving-coil stator and a flange plate; the moving assembly comprises a casing, an outer permanent magnet, an inner permanent magnet, a magnetic conducting ring and a second end cover; the moving-coil stator comprises a cup-shaped framework and a winding and is further fixedly connected onto the first end cover through connection with the flange plate, the inner permanent magnet is arranged on the radial inner side of the moving-coil stator, and the outer permanent magnet is arranged on the radial outer side of the moving-coil stator; the inner wall of the inner permanent magnet is arranged on the magnetic conducting ring in a sleeving manner; the outer wall of the outer permanent magnet is tightly attached to the inner wall of the casing; the magnetic conducting ring and the casing are embedded and fixed with the inner side of the second end cover through clamp ports; the first end cover and the second end cover are convex, the first end cover is connected with the rotating shaft through the bearings, the second end cover is fixed with the rotating shaft through screws, and magnetic polarity of the inner permanent magnet is the same as that of the outer permanent magnet in the radial direction.

Description

technical field [0001] The invention relates to the technical field of permanent magnet direct current motors, in particular to a coreless armature brushless direct current permanent magnet motor with inner and outer rotor structures. Background technique [0002] Permanent magnet motors have the characteristics of compact structure, small size, reliable operation, flexible size and shape, especially coreless motors because of their light weight, no cogging effect, small moment of inertia, fast response and stable operation. It is widely used in daily life, industrial production, aerospace and other fields. [0003] At present, the permanent magnet motor still has the following deficiencies: (1) In the permanent magnet motor, the amount of silicon steel sheets and other soft magnetic materials accounts for a relatively large proportion of the total weight of a single motor, and the silicon steel sheets and soft magnetic materials in the alternating magnetic field Due to the...

AI Technical Summary

Problems solved by technology

[0004] In the hollow cup armature inner and outer rotor brushless DC permanent magnet motor provided by the present invention, the winding of the hollow cup stator is bonded to the flange and fixed on the end cover to keep absolutely still, and the inner permanent magnet, outer permanent magnet, magnetic conducting ring and The casings are relatively stationary to each other. During the operation of the motor, the casing and the magnetic ring are stationary relative to the inner permanent magnet and the outer permanent magnet, so there is no iron loss caused by the alternating magnetic field, and the inner permanent magnet and the outer permanent magnet are separated. The magnetomotive force is in the form of series, which greatly increases the magnetic flux density of the air gap in the motor. At the same time, the coreless stator winding adopts the form of stacked winding, which can easily realize the winding of wire cups with different performance requirements, and effectively solve the problem of internal iron in the motor. Large loss, low air gap magnetic density, insufficient utilization of wire space in hollow cup production, poor winding effect of armature winding wire cup, and even failure to wind into shape

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