Rotor magnet ring and hollow cup motor

By employing anisotropic magnetic rings and dividing the rotor magnetic rings of a coreless motor into magnetic units, and utilizing the deflection angle β to superimpose and cancel the magnetization directions, the problem of insufficient utilization of the inner magnetic field of the rotor magnetic rings is solved, thereby improving the overall performance of the motor.

CN224520788UActive Publication Date: 2026-07-17SHENZHEN LINGQIAO DRIVE & CONTROL TECHNOLOGY CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
SHENZHEN LINGQIAO DRIVE & CONTROL TECHNOLOGY CO LTD
Filing Date
2025-06-10
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

The magnetic field inside the rotor magnetic ring of a coreless motor is difficult to utilize effectively, resulting in a waste of magnetic energy and limiting the overall performance of the machine.

Method used

Anisotropic magnetic rings are used, and magnetic force units are divided in the magnetic poles. By deflecting the angle β, the magnetization direction is superimposed on the outside of the rotor magnetic ring and canceled out on the inside, thereby increasing the strength of the outer magnetic field.

Benefits of technology

By concentrating magnetic field energy in the effective working area, the overall performance of the coreless motor is improved.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application relates to the technical field of motors, in particular to a rotor magnetic ring and a hollow cup motor. The rotor magnetic ring is a polar anisotropic magnetic ring, which comprises at least two pairs of magnetic poles, each pair of the magnetic poles is oppositely arranged on the two sides of the rotor magnetic ring, and the magnetic properties of adjacent magnetic poles are opposite; each magnetic pole comprises at least two magnetic force units arranged along the circumference of the magnetic pole in sequence, the magnetization directions of adjacent magnetic force units have a deflection angle beta, and the magnetization directions of all the magnetic force units are arranged along the circumference with the deflection angle beta, so that the magnetic field intensity on the outer side of the rotor magnetic ring is greater than that on the inner side, the magnetic field energy is concentrated in an effective working area, and the overall working performance of the hollow cup motor is improved.
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Claims

1. A rotor magnet ring, characterized by, The rotor magnetic ring is an anisotropic magnetic ring, including at least two pairs of magnetic poles. Each pair of magnetic poles is disposed opposite to each other on both sides of the rotor magnetic ring, and the magnetic properties of adjacent magnetic poles are opposite. Each magnetic pole includes at least two magnetic units arranged sequentially along the circumference of the magnetic pole. The magnetization directions of adjacent magnetic units are separated by a deflection angle β, and the magnetization directions of all magnetic units are arranged along the circumference according to the deflection angle β, so that the magnetic field strength on the outer side of the rotor magnetic ring is greater than the magnetic field strength on the inner side.

2. The rotor magnet ring of claim 1, wherein The deflection angle β satisfies the following relationship: 0.8(p-1)·360 / (2pN) ≤ β ≤1.2(p-1)·360 / (2pN); Where p is the number of pairs of magnetic poles and p≥2, and N is the number of magnetic units in each magnetic pole and N≥2.

3. The rotor magnet ring of claim 2, wherein The rotor magnetic ring includes two pairs of magnetic poles, each magnetic pole including five magnetic units, and the deflection angle β is from 14.4° to 21.6°; or, The rotor magnetic ring includes 3 pairs of magnetic poles, each magnetic pole includes 6 magnetic units, and the deflection angle β is 16° to 24°.

4. The rotor magnet ring of any one of claims 1 to 3, wherein, The magnetization direction of adjacent magnetic units is determined by the magnetization direction of each magnetic unit, and the magnetization direction of each magnetic unit deflects in steps along the circumference of the rotor magnetic ring according to the deflection angle β.

5. The rotor magnet ring of any one of claims 1 to 3, wherein, The rotor magnetic ring is provided with positioning structures for positioning, and the number of positioning structures matches the number of magnetic poles.

6. The rotor magnet ring of claim 5, wherein The positioning structure includes positioning grooves arranged in a direction parallel to the axial direction of the rotor magnetic ring, and the positioning grooves are evenly distributed on the outer circumferential edge of the end face of the rotor magnetic ring.

7. The rotor magnet ring of claim 6, wherein The positioning slot is a blind slot, and the two end faces of the rotor magnetic ring are arranged in pairs with the positioning slots, and the same pair of positioning slots are aligned in a direction parallel to the axial direction of the rotor magnetic ring.

8. The rotor magnet ring of claim 6, wherein The number of positioning slots is no greater than the number of magnetic poles, and they are located in the middle of the outer circumferential edge of the end face of the magnetic pole.

9. A hollow cup motor, characterized by include: Shaft; The rotor magnetic ring according to any one of claims 1 to 8 is sleeved and fixed to the rotating shaft; And a stator assembly, which is arranged around the outside of the rotor magnetic ring.

10. A hollow cup machine as claimed in claim 9, characterized in that The stator assembly includes an iron core and a winding, the winding being disposed inside the iron core, and a radial air gap being present between the winding and the rotor magnetic ring.