Rotor and motor

The rotor design with linear flat or concave surfaces on protrusions and adhesive application addresses leakage flux issues, enhancing magnetic flux and motor output by reducing cogging torque.

JP2026023293APending Publication Date: 2026-02-13NIDEC INSTR CORP
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Patent Information

Application Number
JP2024125205
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-07-31
Publication Date
2026-02-13

AI Technical Summary

Technical Problem

The arc-shaped outer peripheral surface of protrusions in existing rotors increases leakage flux, leading to reduced effective magnetic flux and motor output.

Method used

A rotor design with linear flat portions or concave surfaces on the outer peripheral surface of protrusions, along with adhesive application methods to fix magnets, reduces leakage flux and enhances adhesive strength, while maintaining effective magnetic flux.

Benefits of technology

The design effectively suppresses cogging torque and maintains or increases effective magnetic flux, thereby improving motor output.

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Abstract

To provide a rotor capable of suppressing reduction in effective magnetic flux due to leakage magnetic flux passing through a protrusion from a magnet in a rotor core in which an opening is formed, and to provide a motor using the rotor.SOLUTION: The rotor 30 includes the rotor core 31 including the plurality of magnetic pole portions 34 extending radially outward in the radial direction from the annular portion, and the plurality of magnets 32 each disposed in the slit portion 50 formed between the magnetic pole portions 34 adjacent to each other in the circumferential direction. The magnetic pole portion 34 includes a protruding portion 341 that protrudes from the radially outer end portion to both sides in the circumferential direction and forms an opening portion 310 on the radially outer side of the slit portion 50. A linear flat surface portion 347 is formed on the outer peripheral surface of the protruding portion 341 on the outer side in the radial direction.SELECTED DRAWING: Figure 6
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Citation Information

Patent Citations

  • Buried magnet motor

    WO2008078584A1