CN205377491U - Electric motor rotor and permanent -magnet machine - Google Patents

Abstract

The utility model provides an electric motor rotor, including rotor core and embedded in rotor core's multiunit permanent magnet, every group permanent magnet includes the arc permanent magnet more than two, and the convex surface of the arc permanent magnet more than two sets up relatively and forms a magnetic pole, and the polarity identical of the convex surface of the arc permanent magnet more than two, in adjacent two sets of permanent magnet, the polarity of two adjacent arc permanent magnets is opposite. The utility model also provides a permanent -magnet machine. The utility model discloses an electric motor rotor and permanent -magnet machine has promoted the anti demagnetization ability of easily moving back the magnetic domain territory, has solved the problem of local demagnetization to integrally lift up the reliability of motor, and it is long -pending to have improved each magnetic pole upper permanent magnet's table magnetic surface, promoted the air -gap flux density degree and the output torque of motor, further promoted the performance of motor.

Description

Motor rotor and permanent magnet motor

technical field

The utility model relates to the technical field of motors, in particular to a motor rotor and a permanent magnet motor.

Background technique

In order to reduce the cost of permanent magnet motors using rare earth NdFeB, non-rare earth ferrite permanent magnets are generally used instead of NdFeB permanent magnets, and the permanent magnets of general motors usually adopt a built-in single-layer arc structure. However, due to the poor magnetic properties of ferrite permanent magnets, the permanent magnet motor with this rotor structure has problems such as low efficiency and easy demagnetization.

Utility model content

In view of the current state of the prior art, the purpose of this utility model is to provide a motor rotor and a permanent magnet motor to solve the problem of easy demagnetization of the motor, thereby improving the reliability of the motor.

In order to achieve the above object, the utility model adopts the following technical solutions:

A motor rotor, comprising:

the rotor core; and

Multiple groups of permanent magnets embedded in the rotor core, each group of permanent magnets includes more than two arc-shaped permanent magnets, the convex surfaces of more than two arc-shaped permanent magnets are arranged opposite to form a magnetic pole, and more than two The polarities of the convex surfaces of the arc-shaped permanent magnets are the same;

Among the two adjacent sets of permanent magnets, the polarities of the adjacent two arc-shaped permanent magnets are opposite.

In one embodiment of the present invention, more than two arc-shaped permanent magnets in each set of permanent magnets are spliced to form a V shape or a U shape.

In one embodiment of the present invention, each set of permanent magnets includes two arc-shaped permanent magnets, which are respectively a first arc-shaped permanent magnet and a second arc-shaped permanent magnet;

The first arc-shaped permanent magnet and the second arc-shaped permanent magnet respectively extend from the shaft hole on the rotor core to the outer surface of the rotor core, and the convex surface of the first arc-shaped permanent magnet and the The convex surfaces of the second arc-shaped permanent magnets are oppositely arranged to form a V shape, and the opening of the V shape faces the outer surface of the rotor iron core.

In one embodiment of the present invention, each set of permanent magnets includes more than three arc-shaped permanent magnets, and more than three arc-shaped permanent magnets are sequentially spliced to form a U shape, and the opening of the U shape faces the The outer surface of the rotor core.

In one embodiment of the present invention, each set of permanent magnets includes three arc-shaped permanent magnets, which are respectively the third arc-shaped permanent magnet, the fourth arc-shaped permanent magnet and the fifth arc-shaped permanent magnet;

Wherein, the convex surface of the third arc-shaped permanent magnet is set towards the outer surface of the rotor core, and the fourth arc-shaped permanent magnet and the fifth arc-shaped permanent magnet are respectively arranged on two sides of the third arc-shaped permanent magnet. The ends are U-shaped, and the convex surface of the fourth arc-shaped permanent magnet is opposite to the convex surface of the fifth arc-shaped permanent magnet.

In one embodiment of the present invention, the arc length of the convex surface of the fourth arc-shaped permanent magnet is greater than or equal to the arc length of the convex surface of the third arc-shaped permanent magnet;

The arc length of the convex surface of the fifth arc-shaped permanent magnet is greater than or equal to the arc length of the convex surface of the third arc-shaped permanent magnet.

In one embodiment of the present utility model, the magnetic performance of the fourth arc-shaped permanent magnet is smaller than that of the third arc-shaped permanent magnet;

The magnetic performance of the fifth arc-shaped permanent magnet is smaller than that of the third arc-shaped permanent magnet.

In one embodiment of the present invention, the angle A between the first arc-shaped permanent magnet and the second arc-shaped permanent magnet or the angle A between the fourth arc-shaped permanent magnet and the fifth arc-shaped permanent magnet The angle A between the magnets satisfies the following relationship:

Among them, p represents the number of poles of the permanent magnet motor.

In one embodiment of the present invention, there is a preset distance between the center of the convex surface and the center of the concave surface of the arc-shaped permanent magnet.

In one embodiment of the present invention, the thickness of the arc-shaped permanent magnet gradually decreases from the center to both ends of the arc-shaped permanent magnet.

In one embodiment of the present utility model, grooves are formed on the outer surface of the rotor core along the axial direction of the rotor core, and the grooves are placed adjacent to two adjacent sets of permanent magnets. between two arc-shaped permanent magnets.

In one embodiment of the present invention, the rotor core is provided with mounting parts for mounting multiple sets of permanent magnets, and the motor device further includes The magnetic isolation bridge between the parts, the width of the magnetic isolation bridge is greater than or equal to the thickness of a silicon steel sheet.

The utility model also provides a permanent magnet motor, comprising a motor stator and the motor rotor described in any one of the above.

The beneficial effects of the utility model are:

The motor rotor and the permanent magnet motor of the utility model adopt two or more arc-shaped permanent magnets to form a group of permanent magnets, and arrange the convex surfaces of more than two arc-shaped permanent magnets to form a magnetic pole, thereby passing through a multi-stage arc. The splicing method of shaped permanent magnets improves the anti-demagnetization ability of the easy-demagnetization area, solves the problem of local demagnetization, and thus improves the reliability of the motor as a whole. At the same time, by using the characteristic that the arc length of the convex surface of the arc-shaped permanent magnet is greater than the arc length of the concave surface, the convex surfaces of more than two arc-shaped permanent magnets are oppositely arranged to provide the magnetic flux of one magnetic pole, thereby improving the permanent magnet under each magnetic pole. The surface magnetic area improves the air gap magnetic density and output torque of the motor, further improving the performance of the motor.

Description of drawings

Fig. 1 is the structural representation of an embodiment of the motor rotor of the present utility model;

Fig. 2 is a partial enlarged view of the motor rotor in Fig. 1;

Fig. 3 is a schematic structural view of another embodiment of the motor rotor of the present invention;

Fig. 4 is a partial enlarged view of the motor rotor in Fig. 3;

Fig. 5 is the schematic diagram of an embodiment of the arc-shaped permanent magnet in the motor rotor of the present invention;

Fig. 6 is the contrast figure of the permanent magnet consumption of the motor rotor of the present invention and the permanent magnet consumption of traditional motor rotor;

Fig. 7 is a comparison diagram of the air-gap magnetic density of the motor rotor of the present utility model and the air-gap magnetic density of the traditional motor rotor;

Fig. 8 is a comparison diagram of the output torque of the motor rotor of the present invention and the output torque of the traditional motor rotor;

Fig. 9 is the magnetic density nephogram of traditional motor rotor under specific demagnetization field;

Fig. 10 is a magnetic density nephogram of the motor rotor of the present invention under the same demagnetizing field.

detailed description

In order to make the technical solution of the utility model clearer, the motor rotor and the permanent magnet motor of the utility model will be further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the utility model and are not intended to limit the utility model.

Referring to FIG. 1 and FIG. 3 , the present invention provides a motor rotor, including a rotor core 100 , multiple sets of permanent magnets embedded in the rotor core, and a rotating shaft (not shown). Wherein, the rotor core 100 is provided with a plurality of mounting parts 110 for mounting multiple sets of permanent magnets, and the mounting parts 110 may be slots or holes provided on the rotor core 100 . In this embodiment, the rotor core 100 is formed by stacking silicon steel sheets in sequence, and the installation part 110 may be a through slot provided on the rotor core 100 . The rotor core 100 is also provided with a shaft hole 120 for installing a rotating shaft, wherein the shaft hole 120 is placed at the center of the rotor core, and a plurality of mounting parts 110 are evenly distributed between the inner surface and the outer surface of the rotor core 100 .

Multiple sets of permanent magnets are correspondingly arranged in multiple installation portions 110 , that is, each set of permanent magnets is placed in the same installation portion 110 . In this embodiment, each mounting portion 110 includes more than two arc-shaped grooves, and two adjacent arc-shaped grooves communicate with each other to form one mounting portion 110 .

Each group of permanent magnets includes more than two arc-shaped permanent magnets, and the convex surfaces of more than two arc-shaped permanent magnets are arranged oppositely to form a magnetic pole, that is, the number of groups of permanent magnets is equal to the number of poles of the permanent magnet motor. In this embodiment, the arc-shaped permanent magnets are non-rare earth permanent magnets. The polarities of the convex surfaces of more than two arc-shaped permanent magnets in each group of permanent magnets are the same, and correspondingly, the polarities of the concave surfaces of more than two arc-shaped permanent magnets are also the same. In this way, by adopting arc-shaped permanent magnets and using The arc length of the convex surface of the arc-shaped permanent magnet is longer than that of the concave surface, which increases the surface magnetic area of the permanent magnet under a magnetic pole, thereby increasing the air gap magnetic density and output torque of the motor, and further improving the performance of the motor.

In one embodiment of the present invention, more than two arc-shaped permanent magnets in each group of permanent magnets are spliced to form a V shape or a U shape, so as to increase the surface magnetic area under the same magnetic pole. V-shaped or U-shaped openings are set toward the outer surface of the rotor core 100, and the convex surfaces of more than two arc-shaped permanent magnets face the inside of the V-shaped or U-shaped, and the polarities of the convex surfaces of more than two arc-shaped permanent magnets are uniform. same.

Among the two adjacent sets of permanent magnets, the polarities of the adjacent two arc-shaped permanent magnets are opposite. Specifically, the concave surfaces of two adjacent arc-shaped permanent magnets are oppositely arranged, and the polarities of the concave surfaces of the two adjacent arc-shaped permanent magnets are opposite. In this way, the polarities of the adjacent two sets of permanent magnets are opposite, thereby satisfying the feature that two adjacent magnetic poles are alternately distributed with N poles and S poles. In the utility model, the anti-demagnetization capability of the demagnetization-prone area is improved by splicing multi-section arc-shaped permanent magnets, and the problem of local demagnetization is solved, thereby improving the reliability of the motor as a whole.

Further, in the cross-sectional direction of the rotor core, multiple sets of permanent magnets are evenly distributed on the rotor core 100, and the multiple sets of permanent magnets are arranged symmetrically about the center. In this way, the magnetic field distribution of the rotor of the motor is evenly distributed, so as to ensure that the rotor of the motor can run stably, thereby ensuring the performance of the motor.

As shown in Figure 6, the single-layer arc profile (dotted line area) in the figure is used to represent the permanent magnet consumption of traditional motor rotor, and the U-shaped profile formed by three arc-shaped permanent magnets is used to represent the utility model. The amount of permanent magnets in the motor rotor. As can be seen from the figure, the permanent magnet consumption of the motor rotor of the utility model is obviously higher than that of the traditional motor rotor, thereby greatly increasing the permanent magnet consumption in the same magnetic pole.

As shown in FIG. 7 , the curve L1 represents the air-gap magnetic density of the conventional motor rotor, and the curve L2 represents the air-gap magnetic density of the motor rotor of the present invention. It can be seen from the figure that the air-gap magnetic density of the motor rotor of the utility model is increased by more than 50% compared with the air-gap magnetic density of the traditional motor rotor.

As shown in FIG. 8 , the curve S1 represents the output torque of the conventional motor rotor, and the curve S2 represents the output torque of the motor rotor of the present invention. It can be seen from the figure that the output torque of the motor rotor of the utility model has been improved by more than 40%.

Fig. 9 and Fig. 10 are respectively the magnetic density nephograms of the traditional motor rotor and the electronic rotor of the present invention under the same demagnetizing field. By comparing Fig. 9 and Fig. 10, it can be known that the motor rotor of the present utility model has Strong anti-demagnetization ability solves the problem of partial demagnetization, thereby improving the reliability of the motor as a whole.

In one embodiment of the present invention, as shown in FIG. 1 , each set of permanent magnets 200 includes two arc-shaped permanent magnets, which are respectively a first arc-shaped permanent magnet 210 and a second arc-shaped permanent magnet 220. Correspondingly, The mounting part 110 is V-shaped and includes two arc-shaped slots connected to each other, and two arc-shaped permanent magnets are respectively placed in the two arc-shaped slots. The first arc-shaped permanent magnet 210 and the second arc-shaped permanent magnet 220 respectively extend from the outer circumference of the shaft hole 120 to the outer surface of the rotor core 100, and the convex surface of the first arc-shaped permanent magnet 210 and the second arc-shaped permanent magnet 220 The convex surfaces are arranged opposite to each other to form a V shape, that is, the convex surfaces of the first arc-shaped permanent magnet 210 and the second arc-shaped permanent magnet 220 face the inside of the V-shape, and the opening of the V-shape faces the outer surface of the rotor core 100 .

2 is a partial enlarged view of FIG. 1, which includes two sets of permanent magnets, wherein, in the first set of permanent magnets 200 on the left, the polarity of the convex surface of the first arc-shaped permanent magnet 210 is different from that of the second arc-shaped permanent magnet. The polarities of the convex surfaces of the magnets 220 are the same, and both are N poles, and the polarities of the concave surfaces of the two arc-shaped permanent magnets are the same, and both are S poles, so that the first group of permanent magnets 200 behaves as a whole relative to other permanent magnet groups. S pole. In the second group of permanent magnets 200 on the right side, the convex surfaces of the two arc-shaped permanent magnets have the same polarity and are both S poles, and the concave surfaces of the two arc-shaped permanent magnets have opposite polarities and are both N poles. In this way, the group of permanent magnets behaves as an N pole as a whole relative to other permanent magnet groups. Therefore, the second arc-shaped permanent magnet 220 in the first set of permanent magnets 200 is adjacent to the first arc-shaped permanent magnet 210 in the second set of permanent magnets 200 , and the polarities of the two are opposite. In this way, the polarities of the adjacent two sets of permanent magnets are opposite, thereby satisfying the feature that two adjacent magnetic poles are alternately distributed with N poles and S poles.

As shown in FIG. 1 , the angle A between the first arc-shaped permanent magnet 210 and the second arc-shaped permanent magnet 220 satisfies the following relationship: where p represents the number of poles of the permanent magnet motor. Wherein, the included angle A represents the size of the projection of the surface magnetic area of the V-shaped permanent magnet group of the magnetic pole on the outer circle of the rotor within the range of the same magnetic pole. By setting the included angle A to the above range, a larger surface magnetic area can be achieved.

In another embodiment of the present utility model, each group of permanent magnets includes more than three arc-shaped permanent magnets, and more than three arc-shaped permanent magnets are spliced in sequence to form a U shape, and the convex surfaces of more than three arc-shaped permanent magnets are uniform. It is arranged toward the inside of the U-shape, and the opening of the U-shape faces the outer surface of the rotor core 100 . At this time, the installation part 110 is also U-shaped, including more than three arc-shaped slots, and more than three arc-shaped permanent magnets are correspondingly arranged in the arc-shaped slots.

As shown in FIG. 3 , each group of permanent magnets 500 may include three arc-shaped permanent magnets, namely a third arc-shaped permanent magnet 510 , a fourth arc-shaped permanent magnet 520 and a fifth arc-shaped permanent magnet 530 . At this time, the installation part 110 is U-shaped and formed by three connected arc-shaped slots, and the three arc-shaped permanent magnets are respectively placed in the three arc-shaped slots.

Wherein, the convex surface of the third arc-shaped permanent magnet 510 faces the outer surface of the rotor core 100, and the concave surface of the third arc-shaped permanent magnet faces the shaft hole 120, that is, the bending direction of the third arc-shaped permanent magnet 510 is in line with the The circumferential direction is the same. The fourth arc-shaped permanent magnet 520 and the fifth arc-shaped permanent magnet 530 are respectively disposed at two ends of the third arc-shaped permanent magnet 510 , and the three arc-shaped permanent magnets are spliced to form a U shape. Wherein, the convex surface of the fourth arc-shaped permanent magnet 520 is opposite to the convex surface of the fifth arc-shaped permanent magnet 530 . In this way, the third arc permanent magnet 510 is placed at the bottom of the U shape, and the fourth arc permanent magnet 520 and the fifth arc permanent magnet 530 are symmetrically arranged on the third arc permanent magnet with respect to the center of the first arc permanent magnet. The two ends of the magnet 510, and the convex surfaces of the three arc-shaped permanent magnets are all facing the inside of the U shape, which is beneficial to increase the surface magnetic area of the permanent magnets under the same magnetic pole, improve the torque of the motor and the magnetic density of the air gap, thereby improving motor performance.

Fig. 4 is a partially enlarged view of Fig. 3, which includes two sets of permanent magnets. Wherein, in the first group of permanent magnets 500 placed on the left side, the polarities of the convex surfaces of the three arc-shaped permanent magnets are the same and are all N poles, and the polarities of the concave surfaces of the three arc-shaped permanent magnets are the same and are all S poles , so that this group of permanent magnets behaves as an S pole as a whole relative to other permanent magnet groups. Placed in the second group of permanent magnets 500 on the right side, the polarities of the convex surfaces of the three arc-shaped permanent magnets are the same and are all S poles, and the polarities of the concave surfaces of the three arc-shaped permanent magnets are the same and are all N poles, so Compared with other permanent magnet groups, this group of permanent magnets behaves as an N pole as a whole. Therefore, the concave surface of the fifth arc-shaped permanent magnet 530 in the first set of permanent magnets 500 is opposite in polarity to the concave surface of the fourth arc-shaped permanent magnet 520 in the second set of permanent magnets 500 . In this way, the polarities of the adjacent two sets of permanent magnets are opposite, thereby satisfying the feature that two adjacent magnetic poles are alternately distributed with N poles and S poles.

The angle A between the fourth arc-shaped permanent magnet 520 and the fifth arc-shaped permanent magnet 530 satisfies the following relationship: where p represents the number of poles of the permanent magnet motor. Wherein, the included angle A represents the size of the projection of the surface magnetic area of the U-shaped permanent magnet group of the magnetic pole on the outer circle of the rotor within the range of the same magnetic pole. By setting the included angle A to the above range, a larger surface magnetic area can be achieved.

As a further improvement, the arc length of the convex surface of the fourth arc-shaped permanent magnet 520 is greater than or equal to the arc length of the convex surface of the third arc-shaped permanent magnet 510; the arc length of the convex surface of the fifth arc-shaped permanent magnet 530 is greater than or equal to the third arc length. The arc length of the convex surface of the arc-shaped permanent magnet 510 . In this way, by setting the arc length of the convex surface of the third arc-shaped permanent magnet 510 to be less than or equal to the arc length of the convex surface of the fourth arc-shaped permanent magnet 520 and the arc length of the convex surface of the fifth arc-shaped permanent magnet 530, the arc length of the convex surface of the fifth arc-shaped permanent magnet 530 can be improved. The anti-demagnetization ability of the motor rotor avoids local demagnetization, thereby improving the reliability of the motor.

In this embodiment, the fourth arc-shaped permanent magnet 520 has the same structure as the fifth arc-shaped permanent magnet 530, that is, the arc length of the convex surface of the fourth arc-shaped permanent magnet 520 is equal to the arc of the convex surface of the fifth arc-shaped permanent magnet 530 Long, so that the processing procedure of the permanent magnet group can be simplified. Certainly, in other embodiments, the structures of the fourth arc-shaped permanent magnet 520 and the fifth arc-shaped permanent magnet 530 may also be different.

In one embodiment of the present utility model, the magnetic performance of the fourth arc permanent magnet 520 is less than the magnetic performance of the third arc permanent magnet 510; the magnetic performance of the fifth arc permanent magnet 530 is less than the third arc permanent magnet 510 magnetic properties. Among them, the magnetic properties here refer to performance indicators such as remanence, coercive force, intrinsic coercive force, and magnetic energy product of the arc-shaped permanent magnet. In this way, by setting the magnetic properties of the third arc-shaped permanent magnet 510 to be higher than the magnetic properties of the fourth arc-shaped permanent magnet 520 and the magnetic properties of the fifth arc-shaped permanent magnet 530, the anti-demagnetization ability of the motor rotor can be improved, Avoid local demagnetization, thereby improving the reliability of the motor. In this embodiment, the magnetic properties of the fourth arc-shaped permanent magnet 520 and the fifth arc-shaped permanent magnet 530 may be permanent magnets with the same magnetic properties, or permanent magnets with different magnetic properties.

In other embodiments, each set of permanent magnets may also include more than four arc-shaped permanent magnets. For example, each group of permanent magnets can include four arc-shaped permanent magnets, and the four arc-shaped permanent magnets are sequentially spliced to form a U shape. The arc-shaped permanent magnets are formed, and the convex surfaces of the four arc-shaped permanent magnets are all set towards the inside of the U-shape, and the opening of the U-shape is towards the outer surface of the rotor iron core.

In other embodiments, each group of permanent magnets can also include five arc-shaped permanent magnets, and the five arc-shaped permanent magnets are sequentially spliced into a U shape, the bottom of the U is formed by one of the arc-shaped permanent magnets, and the U-shaped side walls They are respectively formed by splicing two arc-shaped permanent magnets, the convex surfaces of the five arc-shaped permanent magnets are all set towards the inside of the U-shape, and the opening of the U-shape is towards the outer surface of the rotor iron core. Or, the bottom of the U-shape is formed by splicing successively three arc-shaped permanent magnets, the side walls of the U-shape are respectively formed by an arc-shaped permanent magnet, and the convex surfaces of the five arc-shaped permanent magnets are all set towards the inside of the U-shape, and the U-shaped The opening faces the outer side of the rotor core. Of course, the number of arc-shaped permanent magnets in each group of permanent magnets can also be other numbers, such as more than five, etc., which are not exhaustive here.

In one embodiment of the present invention, there is a preset distance between the center of the convex surface of each arc-shaped permanent magnet and the center of the concave surface, that is, the center of the arc of the convex surface of the arc-shaped permanent magnet and the center of the arc of the concave surface Not agree. As shown in Figure 5, the convex surface of the arc-shaped permanent magnet refers to the arc-shaped surface whose center is O1 and the radius is Rout, and the concave surface of the arc-shaped permanent magnet refers to the arc-shaped surface whose circle center is O2 and the radius is Rin, and the circle center O1 and The distance between the centers O2 is h. In this embodiment, the height h is smaller than the thickness of the arc-shaped permanent magnet. The inner and outer arcs of the traditional arc-shaped permanent magnet are concentric arcs, that is, the arc-shaped permanent magnet is a part of a concentric ring. However, in the present invention, the anti-demagnetization ability of the rotor of the motor is further improved by setting the arc length of the concave surface of the arc-shaped permanent magnet and the arc length of the convex surface out of concentricity, so as to avoid partial demagnetization, thereby improving the reliability of the motor.

Furthermore, the thickness of each arc-shaped permanent magnet gradually decreases from the center of the arc-shaped permanent magnet to the two ends of the arc-shaped permanent magnet, therefore, the thickness in the middle of the arc-shaped permanent magnet is greater than that of the two arc-shaped permanent magnets. end thickness. In this way, by using arc-shaped permanent magnets with thick middle and thin ends, the anti-demagnetization ability of the motor rotor can be improved, local demagnetization can be avoided, and the reliability of the motor can be improved.

In one embodiment of the present utility model, a groove 300 is formed on the outer surface of the rotor core 100 along the axial direction of the rotor core 100, and the groove 300 is placed between two adjacent sets of permanent magnets, specifically, The groove 300 is placed between two adjacent arc-shaped permanent magnets of two adjacent sets of permanent magnets to separate different magnetic poles. Wherein, the number of grooves 300 is equal to the number of sets of permanent magnets, that is, the number of grooves 300 is equal to the number of poles of the motor. In this embodiment, the number of grooves 300 is six.

As a further improvement, the motor rotor further includes a magnetic isolation bridge 400 disposed between the outer surface of the rotor core 100 and the mounting portion 110 . Specifically, the magnetic isolation bridge 400 is disposed between the end of the mounting portion 110 and the outer surface of the rotor core 100 . In this embodiment, the mounting portion 110 is spliced by more than two arc-shaped grooves to form a V-shape or a U-shape. The end of the mounting portion 110 refers to the end of the mounting portion 110 adjacent to the outer surface of the rotor core 100 . As shown in FIG. 1 and FIG. 3 , the width b of the magnetic isolation bridge 400 is greater than or equal to the thickness of a silicon steel sheet used in the rotor. By setting the magnetic isolation bridge 400, the magnetic flux leakage can be reduced, and the performance of the motor can be further improved. At the same time, the magnetic isolation bridge 400 can ensure that the rotor has sufficient mechanical strength and avoid deformation of the rotor during operation, thereby improving the reliability of the motor.

In this embodiment, since the V-shaped mounting portion or the U-shaped mounting portion 110 has at least two ends adjacent to the outer surface of the rotor core 100, the number of magnetic isolation bridges 400 should be greater than or equal to the number of permanent magnet groups. 2 times, that is to say, the number of magnetic isolation bridges 400 is greater than or equal to 2 times the number of poles of the permanent magnet motor.

The utility model also provides a permanent magnet motor, comprising a motor stator and the motor rotor described in any one of the above-mentioned embodiments.

The motor rotor and the permanent magnet motor of the utility model adopt two or more arc-shaped permanent magnets to form a group of permanent magnets, and arrange the convex surfaces of more than two arc-shaped permanent magnets to form a magnetic pole, thereby passing through a multi-stage arc. The splicing method of shaped permanent magnets improves the anti-demagnetization ability of the easy-demagnetization area, solves the problem of local demagnetization, and thus improves the reliability of the motor as a whole. At the same time, by using the characteristic that the arc length of the convex surface of the arc-shaped permanent magnet is greater than the arc length of the concave surface, the convex surfaces of more than two arc-shaped permanent magnets are oppositely arranged to provide the magnetic flux of one magnetic pole, thereby improving the permanent magnet under each magnetic pole. The surface magnetic area improves the air gap magnetic density and output torque of the motor, further improving the performance of the motor.

The above-mentioned embodiments only express several implementation modes of the present utility model, and the description thereof is relatively specific and detailed, but it should not be construed as limiting the patent scope of the present utility model. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the scope of protection of the utility model patent should be based on the appended claims.

Claims (14)

1. a rotor, it is characterised in that including:

Rotor core (100)；And

Being embedded in many groups permanent magnet of described rotor core, often group permanent magnet includes plural arc-shaped permanent magnet, and the convex surface of plural described arc-shaped permanent magnet is oppositely arranged one magnetic pole of formation, and the polarity of the convex surface of plural arc-shaped permanent magnet is identical；

In permanent magnet described in two adjacent groups, the opposite polarity of adjacent two arc-shaped permanent magnets.

2. rotor according to claim 1, it is characterised in that in described often group permanent magnet, plural arc-shaped permanent magnet is spliced to form V-arrangement or U-shaped.

3. rotor according to claim 1, it is characterised in that described often group permanent magnet includes two arc-shaped permanent magnets, respectively the first arc-shaped permanent magnet (210) and the second arc-shaped permanent magnet (220)；

Described first arc-shaped permanent magnet (210) and described second arc-shaped permanent magnet (220) are extended to the outer surface of described rotor core (100) by the axis hole (120) on described rotor core (100) respectively, the convex surface of the convex surface of described first arc-shaped permanent magnet (210) and described second arc-shaped permanent magnet (220) is oppositely arranged formation V-arrangement, and the opening of described V-arrangement is towards the outer surface of described rotor core (100).

4. rotor according to claim 1, it is characterised in that described often group permanent magnet includes more than three arc-shaped permanent magnets, and three the above arc-shaped permanent magnets are sequentially spliced to form U-shaped, and the opening of described U-shaped is towards the outer surface of described rotor core.

5. rotor according to claim 4, it is characterized in that, often organize described permanent magnet and include three arc-shaped permanent magnets, respectively the 3rd arc-shaped permanent magnet (510), the 4th arc-shaped permanent magnet (520) and the 5th arc-shaped permanent magnet (530)；

Wherein, the outer surface convex surface facing described rotor core (100) of the 3rd arc-shaped permanent magnet (510) is arranged, described 4th arc-shaped permanent magnet (520) and described 5th arc-shaped permanent magnet (530) are divided into the two ends formation U-shaped of described 3rd arc-shaped permanent magnet (510), and the convex surface of described 4th arc-shaped permanent magnet (520) and described 5th arc-shaped permanent magnet (530) is oppositely arranged.

6. rotor according to claim 5, it is characterised in that the arc length of the convex surface of described 4th arc-shaped permanent magnet (520) is more than or equal to the arc length of the convex surface of described 3rd arc-shaped permanent magnet (510)；

The arc length of the convex surface of described 5th arc-shaped permanent magnet (530) is more than or equal to the arc length of the convex surface of described 3rd arc-shaped permanent magnet (510).

7. rotor according to claim 5, it is characterised in that the magnetic property of described 4th arc-shaped permanent magnet (520) is less than the magnetic property of described 3rd arc-shaped permanent magnet (510)；

The magnetic property of described 5th arc-shaped permanent magnet (530) is less than the magnetic property of described 3rd arc-shaped permanent magnet (510).

8. rotor according to claim 3, it is characterised in that the included angle A between described first arc-shaped permanent magnet (210) and described second arc-shaped permanent magnet (220) meets following relation:

Wherein, p represents the number of poles of magneto.

9. rotor according to claim 5, it is characterised in that the included angle A between described 4th arc-shaped permanent magnet (520) and described 5th arc-shaped permanent magnet (530) meets following relation:

Wherein, p represents the number of poles of magneto.

10. the rotor according to claim 1-7 any one claim, it is characterised in that there is predeterminable range between the center of circle and the center of circle of concave surface of the convex surface of described arc-shaped permanent magnet.

11. according to the rotor described in claim 1-7 any one claim, it is characterised in that the thickness of described arc-shaped permanent magnet is gradually reduced from the center of described arc-shaped permanent magnet to two ends.

12. according to the rotor described in claim 1-7 any one claim, it is characterized in that, axially offering groove along described rotor core on the outer surface of described rotor core, described groove is placed between adjacent two arc-shaped permanent magnet of permanent magnet described in two adjacent groups.

13. according to the rotor described in claim 1-7 any one claim, it is characterized in that, described rotor core (100) is provided with for installing the installation portion (110) organizing described permanent magnet more, described electric machine also include being arranged between the outer surface of described rotor core (100) and described installation portion (110) every magnetic bridge, the described width every magnetic bridge is more than or equal to the thickness of piece of silicon steel disc.

14. a magneto, it is characterised in that include the rotor described in motor stator and any one of claim 1-13.