Anisotropic inner circle orientation multi-pole magnetic ring and mold and preparation method thereof

Abstract

The invention discloses an anisotropic inner circle orientation multi-pole magnetic ring and a mold and a preparation method thereof, and belongs to the field of magnetic ring manufacturing. The multi-pole magnetic ring is an anisotropic 2n-pole magnetic ring with an oriented inner circle, n is a natural number, and the waveform of a magnetic circuit on the surface of the inner circle of the magnetic ring is a sinusoidal waveform; the mold comprises a core rod, an outer cylinder, an upper pressing head and a lower pressing head, and the core rod, the upper pressing head, the lower pressing head and the outer cylinder are matched and sleeved to form a mold cavity. The core rod comprises a sleeve and a magnet yoke, the magnet yoke comprises a base body and protruding parts, 2n protruding parts are distributed on the side face of the end, stretching into the upper pressing head, of the base body in the circumferential direction, copper wires are wound around the protruding parts respectively, and the protruding parts are sleeved with the sleeve in a matched mode. The preparation method comprises the following steps of: filling magnetic powder into the mold cavity, pressing the magnetic powder, electrifying a copper wire, applying a direct-current or pulsed magnetic field to the magnetic powder, orienting the magnetic powder, sintering, grinding and magnetizing to obtain the anisotropic inner circle orientation multi-pole magnetic ring. The multi-pole magnetic ring is directly manufactured into an integral stator magnetic ring, and stable and quiet operation of a motor is facilitated.

Description

technical field

[0001] The invention belongs to the field of magnetic ring manufacturing, and more specifically relates to an anisotropic inner circle oriented multi-pole magnetic ring, a mold and a preparation method thereof. Background technique

[0002] The magnetic device used as the stator in the motor generally exists in the form of magnetic tiles. Because of the magnetic leakage or the design requirements of the motor for the magnetic circuit, some occasions must require anisotropic multi-pole magnetic rings, which cannot be satisfied by the magnetic tiles. The magnetic tiles are used as the stator, which are generally even-numbered pieces (2 / 4 / 6 / 8 pieces, magnetized to the poles and pasted on the stator casing) to form a circular ring, which uses the magnetic field of its inner arc surface to provide energy. There is magnetic flux leakage in this method, because there is a phenomenon of poor concentricity in piece-by-piece assembly, and the waveform of the inner circ...

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