Multipole magnetic ring

Abstract

The invention relates to the technical field of micromotors, in particular to a multipole magnetic ring. The multipole magnetic ring comprises a magnetic ring body and at least two pairs of circular arc-shaped magnetic sections, wherein the magnetic ring body has an integral structure which is made of magnetic materials by injection molding, the magnetic sections are embedded inside the magnetic ring body, and the magnetic sections are arranged evenly inside the magnetic ring body according to mutually-reversed polarities. A first step is arranged on one side, facing towards the inner wall of the magnetic ring body, of the upper surface of the magnetic ring body, four circular holes are formed in a whole surface where the upper surface of the magnetic ring body and the surface of the first step are connected, wherein a circumference where the four circular holes are located is evenly divided by the four circular holes, and centers of the circular holes are located on a common boundary where the upper surface and the surface of the first step are connected. Two first grooves arranged oppositely are formed in the surface of the first step, a second step is arranged on one side, facing towards the inner wall of the magnetic ring body, of the bottom surface of the magnetic ring body, and second grooves are formed in the second step. The magnetic ring is made of the magnetic materials by once-forming, so that concentricity and mass uniformity of the magnetic ring are guaranteed, and meanwhile, at least two magnetic sections are embedded when the magnetic ring is formed, so that the formed magnetic ring is enabled to have multipole magnetic fields.

Description

technical field [0001] The invention relates to the technical field of micro-motors, in particular to a multi-pole magnetic ring. Background technique [0002] Micro motors are now widely used in automation, electromechanical and other fields. In the fields of micro-motors and stepping motors, multi-pole magnetic rings are widely used as rotors. After a pulse current is passed through the external coils, the rotors rotate through a fixed angle. [0003] The traditional multi-pole magnetic ring is made by bonding multiple magnetic segments, but it is difficult to process when making a small micro-motor. At the same time, it is difficult to make the magnetic pole angle accurately due to the splicing of multiple magnetic segments. It is difficult to achieve uniform quality of the entire magnetic ring, which makes the dynamic balance of the magnetic ring poor, increases the vibration and noise of the motor, and affects the performance of the motor. Contents of the invention ...

AI Technical Summary

Problems solved by technology

[0003] The traditional multi-pole magnetic ring is made by bonding multiple magnetic segments, but it is difficult to process when making a small micro-motor. At the same time, it is difficult to make the magnetic pole angle accurately due to the splicing of multiple magnetic segments. It is difficult to achieve uniform quality of the entire magnetic ring, which makes the dynamic balance of the magnetic ring poor, increases the vibration and noise of the motor, and affects the performance of the motor

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