Rotor for electromotor using permanent magnets

Abstract

The present invention discloses a rotor for an electromotor using permanent magnets. The rotor comprises one or more C-type permanent magnets (9), a core (10), and a rotor shaft (15). Each of the one or more C-type permanent magnets (9) has a C shape and provides magnetic force. The core (10) has a cylindrical shape and has the one or more C-type permanent magnets (9) coupled thereto with different magnetic poles. An aperture (11) is formed at each of the boundaries of the C-type permanent magnets (9) having the different magnetic poles. The rotor shaft (15) is formed at the center of the core (10). Cogging torque can be reduced because a magnetic field of the C-type permanent magnets coupled through the outside core forms a normal sine wave form.

Description

technical field [0001] The present invention relates to a motor rotor using permanent magnets, in particular to a rotor for reducing the reluctance torque and noise of a high-performance permanent magnet rotor applied to a large-capacity, high-output brushless motor. Background technique [0002] Usually, the permanent magnet rotor interacts with the rotating magnetic field of the armature to generate a mechanical rotational torque, but actually it is due to various reasons such as the combination structure of the rotor core and a single permanent magnet, the magnetization pattern, or the pole and gap structure of the armature. , causing the rotating magnetic field to be uneven or the distribution of the rotating magnetic field cannot form an ideal shape similar to a sine wave, thereby generating a reluctance torque (cogging torque), and inducing vibration and noise of the generator, which has become a major problem in related fields. [0003] In particular, large-capacity, ...

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Problems solved by technology

[0009] In addition, the ferrite (ferrite) C-type permanent magnet used in the existing permanent magnet rotor to solve the above problems arranges the magnetic powder along the radial direction during the manufacturing process, or arranges it in a polar anisotropic manner. (anisotropic), and sintering and magnetization can solve the above problems, but for high-performance magnets (alnico), neodymium (Nd: Neodymium), samarium cobalt (SmCo) magnets made by casting, The manufacturing and magnetization methods of this kind of magnetic field arrangement are not easy, and when it is used to manufacture motor rotors, it has the disadvantage that the above problems cannot be solved.

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