Rotor structure of motor and brushless DC motor with same

Abstract

The invention provides a rotor structure of a motor and a brushless dc motor with the rotor structure. The rotor structure includes a rotating shaft, a rotor core and permanent magnet blocks; the rotating shaft penetrates through the center of the rotor core, clamping grooves are evenly formed in the periphery of the rotor core at intervals, convex cones are formed between the adjacent clamping grooves, the permanent magnet blocks are arranged in the clamping grooves, and gaps are formed in the positions, corresponding to the convex cones, between every two adjacent permanent magnet blocks; the rotor structure further comprises adhesive and a fixed mount, the fixed mount is provided with barrier strips, the gaps are filled with the adhesive, the rotor core is contained in the fixed mount, and the barrier strips press against the edges of outer ring surfaces of every two permanent magnet blocks on the two sides of each gap; a plurality of magnetic flux holes are formed in the surface of the rotor core, construction blocks and partition walls are formed between the adjacent magnetic flux holes, wherein the construction blocks and the partition walls are connected, and the bisectrix of the middle between each construction block and each partition wall coincides with the bisectrix of each convex cone. According to the rotor structure of the motor, the stationarity of the permanent magnet blocks of a rotor can be improved, and magnetic conductive performance is enhanced.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a rotor structure of the motor and a brushless DC motor with the rotor structure. Background technique [0002] Due to its wide speed range, good low-speed performance, stable operation, low noise, and high efficiency, brushless DC motors are widely used in various production fields. [0003] CN201220620741 discloses a brushless DC motor, the rotor 1 has a rotor core 11 and a plurality of arc-shaped permanent magnet blocks, the rotor core 11 is provided with arc-shaped grooves, and the plurality of arc-shaped permanent magnet blocks surround the arc fixed on the rotor core 11 However, this method of fixing the permanent magnet block by using the clamping of the arc-shaped groove and the attraction force between the magnet and the iron core 11, the stability of the permanent magnet block is not good. The magnet block may shift or swing relative to the arc-shaped slot due to inerti...

AI Technical Summary

Problems solved by technology

[0003] CN201220620741 discloses a brushless DC motor, the rotor 1 has a rotor core 11 and a plurality of arc-shaped permanent magnet blocks, the rotor core 11 is provided with arc-shaped grooves, and the plurality of arc-shaped permanent magnet blocks surround the arc fixed on the rotor core 11 However, this method of fixing the permanent magnet block by using the clamping of the arc-shaped groove and the attraction force between the magnet and the iron core 11, the stability of the permanent magnet block is not good. The magnet block may shift or swing relative to the arc-shaped slot due to inertia. In particular, with the use of the motor for a long time, each time the permanent magnet block shifts slightly relative to the arc-shaped slot, it will pose a hidden danger to the subsequent safe operation. , and because the displacement of the permanent magnet block will also affect the magnetic flux, affecting the speed

If a shell is placed on the periphery to protect the permanent magnet block, the gap between the outer peripheral surface of the permanent magnet and the inner peripheral surface of the stator structure is very small, which is inconvenient to install the shell, and the shell will block the magnetic force lines of the permanent magnet and affect the magnetic flux. , poor magnetic permeability

In addition, the magnetic flux hole structure on the surface of the rotor core has a great influence on the magnetic flux. In the existing rotor structure, the utilization of the magnetic flux hole to the magnetic flux is not ideal, and it is not conducive to saving rotor materials.

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