CN213243671U

CN213243671U - Permanent magnet rotor for permanent magnet motor

Info

Publication number: CN213243671U
Application number: CN202022632896.9U
Authority: CN
Inventors: 丁凤波
Original assignee: Changzhou Lefeng Motor Co ltd
Current assignee: Changzhou Lefeng Motor Co ltd
Priority date: 2020-11-16
Filing date: 2020-11-16
Publication date: 2021-05-18
Anticipated expiration: 2030-11-16

Abstract

The utility model relates to a permanent magnet rotor for a permanent magnet motor, which comprises an iron core and a multi-pole magnetic ring, wherein the multi-pole magnetic ring is sleeved outside the iron core, an annular plastic part is arranged between the inner side surface of the multi-pole magnetic ring and the iron core, and a rotating shaft is arranged in a shaft hole of the iron core in a penetrating way; the novel permanent magnet rotor has small vibration during rotation, and can not generate shaft current in the rotating shaft.

Description

Permanent magnet rotor for permanent magnet motor

Technical Field

The utility model relates to a permanent-magnet machine technical field, concretely relates to permanent-magnet rotor for permanent-magnet machine.

Background

Permanent magnet rotor is a rotor for permanent-magnet machine, and common permanent magnet rotor includes iron core and pivot on the market, and rotor core's shaft hole is passed in the pivot to together with the iron core fastening, the outside of iron core is equipped with a plurality of boss, and a plurality of magnetic shoe is the spiral-lock respectively between two adjacent bosses, permanent magnet rotor is supported rotatoryly by the bearing.

The following problems exist with the permanent magnet rotor commonly found on the market: the iron core and the magnetic shoe are fixedly bonded, the bonding process is complicated, and the problem of falling off of the magnetic shoe when the permanent magnet rotor rotates can be caused due to the insecure bonding; the vibration of the permanent magnet rotor is large when the permanent magnet rotor rotates, so that the bearing generates resonance and generates resonance noise; when the permanent magnet rotor rotates, shaft current is easily generated on the rotating shaft, and high temperature generated by partial discharge energy of the shaft current can melt a plurality of micro areas on the inner ring, the outer ring or the ball of the bearing and form grooves, so that the service life of the bearing is shortened due to electric corrosion.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is through a permanent magnet rotor for permanent magnet motor, vibration when this permanent magnet rotor rotates is little, and can not produce the axle current in the pivot.

In order to solve the technical problem, the utility model provides a pair of permanent magnet rotor for permanent magnet motor, including iron core and multipolar magnetic ring, the outside of iron core is located to multipolar magnetic ring cover, be equipped with between the medial surface of multipolar magnetic ring and the iron core and be annular and mould the piece, wear to be equipped with the pivot in the shaft hole of iron core.

Furthermore, the iron core, the multi-pole magnetic ring and the plastic part are combined into a whole during injection molding; the iron core and the multi-pole magnetic ring are directly combined into a whole through injection molding, and the fixing mode is simple and reliable.

Furthermore, the iron core comprises a plurality of rotor punching sheets which are mutually overlapped.

Further, the cross section of the plastic part is C-shaped, and the plastic part is coated on two end faces and the outer side face of the iron core; the plastic part covers two end faces of the iron core so as to realize axial fixation of the plastic part on the iron core.

Furthermore, a plurality of grooves are uniformly distributed on the right end opening of the multi-pole magnetic ring at the circumference, protrusions with the same number and the corresponding positions as the grooves are arranged on the outer side surface of the right end of the plastic part, and the protrusions are clamped in the grooves; the structure realizes circumferential fixation and axial fixation of the multistage magnetic ring on the plastic part.

Furthermore, grooves are formed in the left end port and the right end port of the multi-pole magnetic ring, and protrusions are arranged at the two ends of the plastic part; the structure ensures that the multi-stage magnetic ring is more reliably fixed on the plastic part in the axial direction.

Furthermore, the groove and the bulge are both in a semi-waist shape.

The utility model has the advantages that: the novel permanent magnet rotor comprises a multi-pole magnetic ring, the surface magnetic flux density of the multi-pole magnetic ring is high and is obviously superior to the performance of assembling the traditional tile-shaped magnetic steel, and the magnetic field distribution on the surface of the multi-pole magnetic ring is in a sine waveform, so that the design of a motor is facilitated; an annular plastic part is arranged between the inner side surface of the multi-pole magnetic ring and the iron core, and the plastic part has a damping effect, so that the vibration of the permanent magnet rotor during rotation is small, and a bearing for supporting the rotation of the permanent magnet rotor cannot generate resonance and generate resonance noise; the permanent magnet rotor comprises a plastic part and is a magnetism isolating rotor, so that shaft current cannot be generated on a rotating shaft, a bearing for supporting the permanent magnet rotor to rotate cannot be corroded electrically, and the service life of the bearing is longer.

Drawings

In order to clearly illustrate the innovative principles of the invention and its technical advantages compared to the existing permanent magnet rotors, a possible embodiment is illustrated below by way of non-limiting example applying said principles, with the aid of the accompanying drawings. In the figure:

fig. 1 is a schematic view of a permanent magnet rotor for a permanent magnet motor according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of FIG. 1;

FIG. 3 is a left side view of FIG. 2;

fig. 4 is a perspective view of fig. 1.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.

It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the present embodiment are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

In the present invention, unless expressly stated or limited otherwise, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific circumstances.

In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it is necessary to be able to be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent, and is not within the protection scope of the present invention.

As shown in fig. 1-4, a permanent magnet rotor for a permanent magnet motor includes an iron core 1 and a multi-pole magnetic ring 2, the multi-pole magnetic ring 2 is sleeved outside the iron core 1, an annular plastic member 3 is disposed between an inner side surface of the multi-pole magnetic ring 2 and the iron core 1, and a rotating shaft is disposed in a shaft hole of the iron core 1.

Preferably, the iron core 1, the multi-pole magnetic ring 2 and the plastic part 3 are combined into a whole during injection molding; the iron core 1, the multi-pole magnetic ring 2 and the plastic part 3 can be bonded and fixed.

The iron core 1 comprises a plurality of rotor punching sheets which are mutually overlapped.

The cross section of the plastic part 3 is C-shaped, and the plastic part 3 is coated on two end faces and the outer side face of the iron core 1.

Preferably, four grooves 4 are uniformly distributed on the right end opening of the multi-pole magnetic ring 2 at the circumference, four protrusions 5 corresponding to the grooves 4 are arranged on the outer side surface of the right end of the plastic part 3, and the protrusions 5 are clamped in the grooves 4; the left and right ports of the multi-pole magnetic ring 2 can be provided with grooves 4, and the two ends of the plastic part 3 are provided with protrusions 5.

Preferably, the groove 4 and the protrusion 5 are both semi-waist-shaped; the grooves 4 and the protrusions 5 can also be semicircular, square or polygonal.

The novel permanent magnet rotor comprises a multi-pole magnetic ring 2, the surface magnetic flux density of the multi-pole magnetic ring 2 is high and is obviously superior to the performance of assembling the traditional tile-shaped magnetic steel, and the distribution of the magnetic field on the surface of the multi-pole magnetic ring 2 is in a sine waveform, so that the design of a motor is facilitated; an annular plastic part 3 is arranged between the inner side surface of the multi-pole magnetic ring 2 and the iron core 1, and the plastic part 3 has a damping effect, so that the vibration of the permanent magnet rotor during rotation is small, and a bearing for supporting the rotation of the permanent magnet rotor cannot generate resonance and generate resonance noise; the permanent magnet rotor comprises the plastic part 3 and is a magnetism isolating rotor, so that shaft current cannot be generated on a rotating shaft, a bearing for supporting the permanent magnet rotor to rotate cannot be corroded electrically, and the service life of the bearing is longer.

The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A permanent magnet rotor for a permanent magnet motor is characterized by comprising an iron core (1) and a multi-pole magnetic ring (2), wherein the multi-pole magnetic ring (2) is sleeved on the outer side of the iron core (1), an annular plastic part (3) is arranged between the inner side surface of the multi-pole magnetic ring (2) and the iron core (1), and a rotating shaft penetrates through a shaft hole of the iron core (1).

2. The permanent magnet rotor of claim 1, wherein: the iron core (1), the multi-pole magnetic ring (2) and the plastic part (3) are combined into a whole during injection molding.

3. The permanent magnet rotor of claim 1, wherein: the iron core (1) comprises a plurality of rotor punching sheets which are mutually overlapped.

4. The permanent magnet rotor of claim 1, wherein: the cross section of the plastic part (3) is C-shaped, and the plastic part (3) is coated on two end faces and the outer side face of the iron core (1).

5. The permanent magnet rotor of claim 1, wherein: the multi-pole magnetic ring is characterized in that a plurality of grooves (4) are uniformly formed in the right end opening of the multi-pole magnetic ring (2) in the circumferential direction, protrusions (5) which are the same as the grooves (4) in number and correspond to the grooves in position are arranged on the outer side face of the right end of the plastic part (3), and the protrusions (5) are clamped in the grooves (4).

6. The permanent magnet rotor of claim 5, wherein: the left and right ports of the multi-pole magnetic ring (2) are provided with grooves (4), and the two ends of the plastic part (3) are provided with bulges (5).

7. The permanent magnet rotor according to claim 5 or 6, characterized in that: the groove (4) and the protrusion (5) are semi-waist-shaped.