Bladeless motor surface-mounted permanent magnet rotor mortise and tenon type magnetic steel pole error structure

Abstract

The application relates to the technical field of special motors and discloses a mortise and tenon type magnetic steel pole error structure of a surface-mounted permanent magnet rotor of a brushless motor, which comprises a shaft serving as one of basic components of an overall structure and used for supporting pole error magnetic steels, an iron core with a hole connected and fixed with the shaft and an outer wall pasted with magnetic steels and having a magnetic conducting effect, magnetic steels with two sector grooves with an angle of alpha provided at end faces and pasted and fixed on the outer wall of the iron core and used for generating permanent magnetic fields, and magnetic steel wedges embedded in the sector grooves of the magnetic steels and pasted on the outer wall of the iron core and used for ensuring that axially adjacent same-pole magnetic steels are staggered by an angle of alpha; the iron core is made of silicon steel sheets through lamination; the magnetic steels comprise N-pole magnetic steels and S-pole magnetic steels, and same-pole adjacent magnetic steels are axially staggered by an angle of alpha. By mutually staggering same-pole segmented magnetic steels of the surface-mounted permanent magnet rotor by a certain angle, the motor tooth slot effect is weakened, and the motor running stability is improved.

Description

Technical Field

[0001] This invention relates to the field of special motor technology, specifically to a brushless motor with a surface-mounted permanent magnet rotor and a tenon-and-mortise type magnet pole-shifting structure. Background Technology

[0002] Using staggered poles of rotor magnets in brushless motors is an effective measure to reduce the cogging effect. The rotor magnets are arranged with alternating N and S poles along the circumference; magnets of the same pole are attached axially, with each segment staggered at a certain angle. This places the magnets of the same pole in different positions relative to the stator teeth, weakening the magnetic pull between the staggered magnets and the stator teeth, thus reducing the cogging effect.

[0003] In conventional surface-mount permanent magnet rotors with misaligned pole structures, the misaligned magnets of the same pole are typically positioned using auxiliary fixtures and bonded in place with adhesive. The auxiliary fixtures are removed after the adhesive has cured. Each rotor bonding requires one auxiliary fixture, which must be removed after the adhesive has cured. This results in low fixture utilization and a complex process. To prevent the auxiliary fixtures from sticking to the adhesive, they are generally made of polytetrafluoroethylene (PTFE). However, wear on these fixtures can lead to decreased magnet positioning accuracy, affecting the reduction of the cogging effect in the motor. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a tenon-and-mortise type magnet offset structure for surface-mounted permanent magnet rotors in brushless motors, which solves the problem of decreased magnet positioning accuracy caused by tooling wear.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a brushless motor surface-mount permanent magnet rotor with a tenon-and-mortise type magnet offset structure, comprising:

[0006] The shaft, as one of the basic components of the overall structure, is used to support the misaligned magnets;

[0007] The iron core has an inner hole that is fixed to the shaft, and magnets are attached to the outer wall to provide magnetic conductivity.

[0008] The magnet has two fan-shaped grooves with an angle of α on its end face, which are bonded and fixed to the outer wall of the iron core to generate a permanent magnetic field.

[0009] A magnetic wedge, which is embedded in the fan-shaped groove of the magnet and bonded to the outer wall of the iron core, is used to ensure that adjacent magnets of the same pole are staggered by an angle α in the axial direction.

[0010] Preferably, the iron core is made of laminated silicon steel sheets.

[0011] Preferably, the magnets include N-pole magnets and S-pole magnets. The N-pole magnets and S-pole magnets are bonded to the outer cylindrical surface of the iron core at intervals along the circumferential direction. Magnets of the same pole are bonded to each other in the axial direction. Each magnet has two fan-shaped grooves with an angle of α. Magnet wedges with an angle of α are bonded and embedded in the grooves. The grooves of diagonally adjacent magnets of different poles are aligned with the magnet wedges and bonded in place. Each magnet and magnet wedge is bonded in place in sequence, so that axially adjacent magnets of the same pole are staggered by an angle of α.

[0012] Preferably, a protective cover for the magnet is bonded and fixed to the outer wall of the magnet.

[0013] Working principle: The shaft is inserted into the central hole of the iron core for connection and fixation. Magnet blocks are pasted circumferentially with N and S poles alternately on the outer wall of the iron core. Magnet blocks of the same pole are divided into three sections along the axial direction. A fan-shaped groove with a specific angle α is opened at the diagonal of the outer wall of each magnet. Magnet wedges with an angle of α are pasted and embedded in the fan-shaped grooves. Precise control of the staggered pole angle can be achieved without the use of auxiliary structures. Assembly is simple and production efficiency is high. Moreover, the length of the magnet wedge is twice that of the fan-shaped groove, so that adjacent axial magnets of the same pole are staggered by a certain angle, which weakens the cogging effect of the motor and improves the smoothness of motor operation. After all magnet blocks and magnet wedges are pasted in place, a magnet protective cover is fitted into the outer wall of the rotor magnet and firmly bonded. After curing, the surface-mounted permanent magnet rotor of the brushless motor with mortise and tenon magnet staggered pole structure is completed, which brings convenience to the work.

[0014] This invention provides a tenon-and-mortise type magnet offset structure for a surface-mount permanent magnet rotor in a brushless motor. It offers the following advantages:

[0015] 1. This invention enables the same-pole segmented magnets of the surface-mounted permanent magnet rotor to be staggered at a certain angle, thereby reducing the cogging effect of the motor and improving the smoothness of motor operation.

[0016] 2. This invention can achieve precise control of the polarity angle without the need for auxiliary tooling positioning, making assembly simple and production efficiency high. Attached Figure Description

[0017] Figure 1 This is a diagram illustrating the misaligned pole structure in this invention;

[0018] Figure 2 This is a cross-sectional view of the misaligned pole structure in this invention;

[0019] Figure 3 This is a side view of the misaligned pole structure in this invention;

[0020] Figure 4 This is a schematic diagram of the misaligned pole structure in this invention.

[0021] Among them, 1. Shaft; 2. Iron core; 3. Magnet; 4. Magnet wedge; 5. Magnet protective cover. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Example 1:

[0024] Please see the appendix Figure 1 - Appendix Figure 4 This invention provides a brushless motor surface-mount permanent magnet rotor tenon-and-mortise type magnet offset structure, comprising:

[0025] Shaft 1, as one of the basic components of the overall structure, is used to support the misaligned magnets;

[0026] Iron core 2, whose inner hole is fixed to the shaft, and whose outer wall is attached with magnets, has a magnetic conduction function;

[0027] Magnet 3 has two fan-shaped grooves with an angle of α on its end face, which are bonded and fixed to the outer wall of iron core 2 to generate a permanent magnet magnetic field.

[0028] The magnetic wedge 4 is embedded in the fan-shaped groove of the magnet 3 and bonded to the outer wall of the iron core 2 to ensure that adjacent magnets 3 are staggered by an angle α.

[0029] Specifically, a magnetic wedge 4 with the same opening angle as itself is pasted and embedded in the fan-shaped groove. The diagonally adjacent fan-shaped grooves of different poles are aligned with the magnetic wedge 4 and pasted in place. Then, each magnet 3 and magnetic wedge 4 are pasted in place in sequence. This can make the axially adjacent magnets of the same pole staggered by a certain angle, weaken the cogging effect of the motor, and improve the smoothness of the motor operation.

[0030] Core 2 is made of laminated silicon steel sheets;

[0031] Magnet 3 includes N-pole magnets and S-pole magnets, which are bonded to the outer cylindrical surface of iron core 2 at intervals along the circumferential direction;

[0032] Specifically, the same pole magnet 3 is divided into several segments along the axial direction. Each magnet 3 has two fan-shaped grooves with an angle of α. Magnet wedges 4 with an angle of α are pasted and embedded in the grooves. The fan-shaped grooves of diagonally adjacent magnets of different poles are aligned with the magnet wedges 4 and pasted in place. Each magnet 3 and magnet wedge 4 is pasted in place in sequence, so that the axially adjacent magnets of the same pole are staggered by an angle of α.

[0033] A protective cover 5 is bonded and fixed to the outer wall of the magnet 3;

[0034] Specifically, the magnet protective cover 5 is a thin-walled cylindrical structure, which serves to enhance the strength of the rotor structure and protect the magnet 3.

[0035] Example 2:

[0036] The features that are the same as those in Embodiment 1 will not be repeated here. The differences are as follows:

[0037] Shaft 1, as one of the basic components of the overall structure, is supported by magnetic steel and has the functions of both shaft 1 and iron core 2. Magnets 3 and magnetic wedges 4 are bonded to the outer wall and have a magnetic guiding function.

[0038] Specifically, shaft 1 combines the functions of shaft 1 and iron core 2, and can achieve precise control of the misalignment angle without the need for auxiliary tooling positioning. It is easy to assemble and has high production efficiency.

[0039] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A brushless motor with a surface-mount permanent magnet rotor and a tenon-and-mortise type magnet pole-shifting structure, characterized in that, include: Shaft (1), which serves as one of the basic components of the overall structure, is used to support the misaligned magnets; The iron core (2) has its inner hole fixed to the shaft and its outer wall is pasted with magnets, which has a magnetic conduction function. The iron core (2) is made of silicon steel sheets stacked together. The magnet (3) has two fan-shaped grooves with an angle of α on its end face, which are bonded and fixed to the outer wall of the iron core (2) to generate a permanent magnet magnetic field. A magnetic wedge (4) is embedded in the fan-shaped groove of the magnet (3) and bonded to the outer wall of the iron core (2) to ensure that adjacent magnets (3) are staggered by an angle α. The magnet (3) includes N-pole magnets and S-pole magnets. The N-pole magnets and S-pole magnets are bonded to the outer cylindrical surface of the iron core (2) at intervals along the circumferential direction. Magnets of the same pole are bonded to each other along the axial direction. Two fan-shaped grooves with an angle of α are opened on each magnet. A magnetic wedge with an angle of α is bonded and embedded in the groove. The grooves of diagonally adjacent magnets of different poles are aligned with the magnetic wedges and bonded in place. Each magnet and magnetic wedge is bonded in place in sequence, so that adjacent magnets of the same pole in the axial direction are staggered by an angle α. A magnetic protective cover (5) is bonded and fixed to the outer wall of the magnet (3).

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