Novel multi-layer structure of rotor core

Abstract

The invention relates to a novel multi-layer structure of a rotor core. The novel multi-layer structure of the rotor core is formed by laminating punched silicon-steel sheets and embedding magnetic steel. During the design of a rotor, a double-layer structure is adopted, wherein the first layer comprises a piece of linear magnetic steel; and the second layer of magnetic steel has a V-shaped structure. Magnetic flux can be output to a largest extent by reasonably designing the length of the magnetic steel and distances between the respective magnetic steel, and the similarity of a counter potential wave form and a sine wave reaches 1.02 to 1.04. In a novel multi-layer embedded rotor sheet, on the basis of reserving the conventional advantages that a motor smoothly operates at a speed of 8,000 rpm, by the unique multi-layer structure of the rotor, the output of the magnetic flux of each electrode can be guaranteed to a largest extent, and the volume of the magnetic steel cannot be greatly increased.

Description

technical field [0001] The invention belongs to the field of permanent magnet synchronous motors and relates to a multi-layer structure of a novel rotor core. Background technique [0002] Now commonly used permanent magnet synchronous motor rotor core sub-surface type and embedded type. Existing surface rotor structures are divided into protruding and embedded, and permanent magnets provide the direction of magnetic flux. The surface of the protruding rotor core is pasted with tile-shaped magnetic steel, and the outer surface of the permanent magnet and the inner circle of the stator core are generally only covered with a non-magnetic cylinder for protection, or the surface of the permanent magnet poles is covered with a non-woven glass ribbon for protection. This is to prevent the rotor magnetic steel from detaching from the rotor core under the joint action of centrifugal force and electromagnetic torque when the rotating speed exceeds 5000rpm. There is a ferromagnetic ...

AI Technical Summary

Problems solved by technology

[0003] The main disadvantage of the surface-protruding rotor is that the structural adhesive layer is applied between the magnet steel and the upper surface of the rotor core. Since the design of the magnet steel and the rotor core surface generally only leaves a gap of about 0.05, but because the best domestic magnet steel The manufacturer's processing accuracy can only be guaranteed at ±0.04mm, and the tolerance of the outer diameter of the rotor after lamination is also +0.02-+0.05mm, so there must be a local gap that is too small after pasting, resulting in some structural glue rare or missing

[0004] After research, the reason for the phenomenon that the magnetic steel is usually thrown out and broken is that when the high-speed operation is performed, the local magnetic steel is not firmly attached to the surface of the rotor core, and is thrown out by centrifugal force a little, hitting the stator core, causing the contact part to be broken. Splashed magnets block the air gap and stop the motor

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