CN217642908U

CN217642908U - Electric machine

Info

Publication number: CN217642908U
Application number: CN202221507741.5U
Authority: CN
Inventors: 朝子雅弘; 藤田裕介
Original assignee: Nidec Intelligent Research Institute Pinghu Co ltd; Nidec Techno Motor Corp
Current assignee: Nidec Intelligent Research Institute Pinghu Co ltd; Nidec Techno Motor Corp
Priority date: 2022-06-16
Filing date: 2022-06-16
Publication date: 2022-10-21
Anticipated expiration: 2032-06-16

Abstract

The utility model relates to the technical field of electric machines, a motor is provided, include: a rotating shaft extending along a central axis; a rotor supported by the rotating shaft; a stator disposed opposite to the rotor; a housing for accommodating the stator and the rotor; a first bearing for supporting the rotating shaft and enabling the rotating shaft to rotate; a bearing support portion that holds the first bearing; the rotor includes: the stator is provided with a stator iron core; the axial dimension of the rotor magnet is larger than that of the rotor core, and a steel plate is arranged between the rotor core and the rotor magnet in the circumferential direction. The utility model discloses can reduce the magnetic resistance, increase the magnetic flux, realize reducing the magnetic leakage of rotor core external diameter tip, increase the magnetic linkage towards stator core to effectively utilize rotor magnet's magnetic flux, improve the output of motor under equal size.

Description

Electric machine

Technical Field

The utility model relates to the technical field of electric machines, especially, relate to a motor.

Background

Currently, in the existing design, the output performance of the motor is mainly improved by the following two methods:

the first way is that the height of the rotor magnet is greater than that of the rotor iron core; the second way is that the height of the rotor magnet and the height of the rotor core are both larger than the height of the stator core.

For the first mode, the excess part of the rotor magnet is exposed in the air, the magnetic resistance in the air is more than 1000 times of that of the electromagnetic steel plate, and the magnetic flux is reduced, so that the magnetic force of the magnet cannot be effectively utilized, and the output performance is reduced;

for the second mode, the magnetic leakage at the end part of the outer diameter of the rotor core is more, the thickness of the rotor core is increased, and the cost is improved.

SUMMERY OF THE UTILITY MODEL

The utility model discloses mainly solve prior art's rotor magnet and surpass the part and expose in the air, lead to the output performance to reduce to and the more technical problem of rotor core's external diameter tip magnetic leakage, propose a motor, in order to reach the magnetic flux of effectively utilizing magnet, improve the purpose of motor output under equal size.

The utility model provides a motor, include: a rotating shaft extending along a central axis; a rotor supported by the rotating shaft; a stator disposed opposite to the rotor; a housing for accommodating the stator and the rotor; a first bearing for supporting the rotary shaft and allowing the rotary shaft to rotate; a bearing support portion that holds the first bearing; the rotor includes: the stator is provided with a stator iron core; the axial dimension of the rotor magnet is larger than that of the rotor iron core, and a steel plate is arranged between the rotor iron core and the circumferential direction of the rotor magnet.

Further, the axial dimension of the stator core is larger than the axial dimension of the rotor core.

Furthermore, the parts of the two ends of the rotor iron core, which are close to the rotor magnet, are not punched, and the rest parts are tilted upwards to be configured with the steel plates.

Further, the radial dimension of the rotor core where the rotor magnet is arranged is the same as the axial dimension of the rotor magnet.

Further, still include: a second bearing for supporting the rotation shaft to rotate in cooperation with the first bearing; the rotor is located between the first bearing and the second bearing.

Further, the first bearing and the second bearing are housed within the housing; the housing receives the second bearing portion with a smaller diameter than the diameter of the stator and rotor portions.

Furthermore, two opposite sides of the shell are respectively provided with a connecting part; and the shell is also provided with a junction box.

The utility model provides a pair of motor through dispose the steel sheet in rotor magnet side, reduces the magnetic resistance, increases the magnetic flux, realizes reducing the magnetic leakage of rotor core external diameter tip, increases the flux linkage towards stator core to effectively utilize rotor magnet's magnetic flux, improve the output of motor under equal size.

Drawings

Fig. 1 is a schematic view of an internal structure of a motor housing provided by the present invention;

fig. 2 is a schematic structural diagram of a motor housing provided by the present invention;

fig. 3 is a schematic structural diagram of a rotor and a stator of an electric machine provided by the present invention;

fig. 4 is a schematic structural view of a steel plate at the side of a rotor magnet of the motor provided by the present invention;

fig. 5 is a schematic structural diagram of a connecting portion and a junction box provided in a motor housing according to the present invention.

Reference numerals: 1. a rotating shaft; 2. a first bearing; 3. a bearing support portion; 4. a rotor; 5. a housing; 6. a stator; 7. a second bearing; 8. a steel plate; 41. a rotor core; 42. a rotor magnet; 51. a connecting portion; 52. a junction box; 61. a stator core is provided.

Detailed Description

In order to make the technical problems, the technical solutions adopted and the technical effects achieved by the present invention clearer, the following description is made in conjunction with the accompanying drawings and embodiments for further details of the present invention. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the relevant portions of the present invention are shown in the drawings.

As shown in fig. 1, an embodiment of the present invention provides a motor including: a rotating shaft 1 extending along a central axis; a rotor 4 supported by the rotating shaft 1; a stator 6 disposed opposite to the rotor 4; as shown in fig. 2, the housing 5 for accommodating the stator 6 and the rotor 4, the housing 5 is usually made of resin; a first bearing 2 for rotatably supporting the rotary shaft 1; a bearing support portion 3 that holds the first bearing 2; as shown in fig. 3, the rotor 4 includes: a rotor iron core 41 and a rotor magnet 42, wherein the stator 6 is provided with a stator iron core 61, and the upper part and the lower part of the stator iron core 61 are provided with insulating parts; the axial dimension of the rotor magnet 42 is larger than the axial dimension of the rotor core 41, and as shown in fig. 4, a steel plate 8 is provided between the rotor core 41 and the rotor magnet 42 in the circumferential direction, and the steel plate is disposed on the side surface of the rotor magnet 42, whereby the magnetic resistance can be reduced and the magnetic flux can be increased, the leakage flux at the outer diameter end portion of the rotor core 41 can be reduced, and the flux linkage toward the stator core 61 can be increased. With the above two methods, the magnetic flux of the rotor magnet 42 can be effectively utilized, and the motor output can be improved with the same magnitude.

In the present embodiment, as shown in fig. 3, the axial dimension of the stator core 61 is larger than the axial dimension of the rotor core 41. The output characteristic of the motor is improved under the same size, the number of the punching sheets of the rotor core 41 is reduced, and the production cost of the motor is reduced.

In the present embodiment, as shown in fig. 4, the portions of both ends of the rotor core 41 near the rotor magnets 42 are not punched, and the remaining portions are tilted upward to dispose the steel plates 8, thereby facilitating the disposition of the steel plates.

In the present embodiment, as shown in fig. 4, the radial dimension of the rotor core 41 where the rotor magnet 42 is disposed is the same as the axial dimension of the rotor magnet 42. The waste materials for processing the rotor iron core are used as steel plates, so that the production cost of the motor can be reduced, and the consumption of resources is saved.

In this embodiment, as shown in fig. 1, the method further includes: a second bearing 7 for supporting the rotation of the rotating shaft 1 in cooperation with the first bearing 2; the rotor 4 is located between the first bearing 2 and the second bearing 7. The double bearings can prevent the rotor 4 and the stator 6 from generating radial deflection to influence the output of the motor.

In the present embodiment, as shown in fig. 2, the first bearing 2 and the second bearing 7 are accommodated in the housing 5; the diameter of the part of the housing 5 that houses the second bearing 7 is smaller than the diameter of the part that houses the stator 6 and the rotor 4.

In the present embodiment, as shown in fig. 5, the opposite sides of the housing 5 are respectively provided with a connection portion 51 for connecting an external device; the housing 5 is further provided with a terminal box 52, and the terminal box 52 is connected with the stator 6 in the housing 5, so that external equipment can be conveniently wired.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: it is to be understood that modifications may be made to the technical solutions described in the foregoing embodiments, or some or all of the technical features may be equivalently replaced, without substantially departing from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electric machine, the electric machine comprising:

a rotating shaft (1) extending along a central axis;

a rotor (4) supported by the rotating shaft (1);

a stator (6) disposed opposite to the rotor (4);

a housing (5) accommodating the stator (6) and the rotor (4);

a first bearing (2) that supports the rotating shaft (1) and enables the rotating shaft to rotate;

a bearing support portion (3) that holds the first bearing (2);

it is characterized in that the preparation method is characterized in that,

the rotor (4) comprises: a rotor iron core (41), a rotor magnet (42), and a stator (6) having a stator iron core (61);

the axial dimension of the rotor magnet (42) is larger than that of the rotor iron core (41), and a steel plate (8) is arranged between the rotor iron core (41) and the rotor magnet (42) in the circumferential direction.

2. An electric machine according to claim 1, characterized in that the axial dimension of the stator core (61) is larger than the axial dimension of the rotor core (41).

3. The motor according to claim 1, wherein the portions of the two ends of the rotor core (41) close to the rotor magnets (42) are not punched, and the rest portions are tilted upwards to configure the steel plates (8).

4. An electric machine according to claim 1, characterized in that the radial dimension where a rotor magnet (42) is arranged in the rotor core (41) is the same as the axial dimension of the rotor magnet (42).

5. The electric machine of claim 1, further comprising: a second bearing (7) for supporting the rotation shaft (1) to rotate in cooperation with the first bearing (2); the rotor (4) is located between the first bearing (2) and the second bearing (7).

6. The machine according to claim 5, characterized in that said first bearing (2) and said second bearing (7) are housed inside said casing (5); the diameter of the part of the housing (5) containing the second bearing (7) is smaller than the diameter of the part containing the stator (6) and the rotor (4).

7. The machine according to claim 6, characterized in that the opposite sides of the housing (5) are provided with respective connection portions (51); and the shell (5) is also provided with a junction box (52).