CN112152358A - Rotor laminations, rotor cores, motors and compressors - Google Patents

Abstract

The invention provides a rotor punching piece, a rotor iron core, a motor and a compressor. The rotor punching piece includes a punching piece body, a shaft hole and a plurality of mounting parts, wherein the shaft hole is arranged on the punching piece body. A plurality of mounting parts are arranged on the punch body around the shaft hole. Each of the plurality of mounting parts includes two magnet slots, and each of the two magnet slots includes a first slot end close to the shaft hole, wherein the first slot end includes a straight slot segment and is connected to the straight slot segment. Arc slot segments at both ends. In the present invention, the first slot end near the shaft hole in each magnet slot includes a straight slot segment and an arc slot segment, which can effectively improve the magnetic flux leakage and demagnetization of the permanent magnet located in the magnet slot, and can also reduce the frequency of the motor. Under the condition of high speed and high torque, the stress and deformation of the rotor punching plate can improve the mechanical strength of the rotor punching plate, enhance the reliability of the motor, solve the problem that the mechanical strength of the rotor punching plate cannot meet the requirements at high speed, and realize low magnetic flux leakage and high strength. motor design.

Description

Rotor laminations, rotor cores, motors and compressors

technical field

The invention relates to the technical field of motor equipment, in particular, to a rotor punch, a rotor iron core, a motor and a compressor.

Background technique

At present, the rotor composition of the motor includes rotor punches. As the key component of the rotor, the design of the rotor punches directly determines the performance of the motor. In order to improve the magnetic steel demagnetization and magnetic leakage phenomenon of the motor, and improve the utilization rate of the magnetic steel. It is often used to reduce the width of the magnetic isolation bridge of the rotor punching piece. However, when the motor is operating at high speed, the magnetic isolation bridge of the rotor is subjected to large force, and the narrow magnetic isolation bridge is difficult to meet the rotor structural strength requirements at high speed. Therefore, how to improve the structural strength of the rotor on the basis of reducing the flux leakage has become an urgent problem to be solved.

SUMMARY OF THE INVENTION

The present invention aims to solve at least one of the technical problems existing in the prior art or related technologies.

To this end, the first aspect of the present invention is to provide a rotor punch.

A second aspect of the present invention is to provide a rotor core.

A third aspect of the present invention is to provide a motor.

A fourth aspect of the present invention is to provide a compressor.

In view of this, according to a first aspect of the present invention, a rotor punch is provided, which includes a punch body, a shaft hole and a plurality of mounting parts, wherein the shaft hole is provided on the punch body. A plurality of mounting parts are arranged on the punch body around the shaft hole. Each of the plurality of mounting parts includes two magnet slots, and each of the two magnet slots includes a first slot end close to the shaft hole, wherein the first slot end includes a straight slot segment and is connected to the straight slot segment. Arc slot segments at both ends.

The rotor punch provided by the present invention includes a punch body, a shaft hole and a plurality of mounting parts. The shaft hole is opened on the punching piece body, and the punching piece body is made of silicon steel material. Among them, silicon steel refers to silicon alloy steel with a silicon content of 1.0% to 4.5% and a carbon content of less than 0.08%. Silicon steel has the characteristics of high permeability, low coercivity, and large resistivity, so hysteresis loss and eddy current loss are relatively small. The shaft hole is used to assemble the shaft of the rotor. The plurality of mounting parts are arranged on the punch body around the shaft hole. It is worth noting that the structure of each mounting part of the plurality of mounting parts may be the same or partially the same, and it can be adjusted according to actual needs. Each mounting part includes two magnet slots, each magnet slot includes a first slot end close to the shaft hole, wherein the slot wall of the first slot end includes a straight slot segment and an arc slot segment connected to both ends of the straight slot segment. The straight slot sections at the two first slot ends can ensure that the width of the magnetic isolation bridge between the two straight slot sections will not be too large to affect the magnetic steel demagnetization, magnetic leakage phenomenon and the utilization rate of the magnetic steel. By setting arc slot sections at both ends of the straight slot section, the arc slot section can strengthen the structure of the position where centrifugal force is concentrated (the maximum force), reduce the stress and deformation of the rotor under the condition of high speed and high torque of the motor, and improve the mechanical performance of the rotor. Strength, enhance motor reliability. It should be noted that the location on the punch body where the centrifugal force is concentrated refers to the punch body between the arc groove segments of the two first groove ends. In the present invention, the first slot end near the shaft hole in each magnet slot includes a straight slot segment and an arc slot segment, which can effectively improve the magnetic flux leakage and demagnetization of the permanent magnet located in the magnet slot, and can also reduce the frequency of the motor. Under the condition of high speed and high torque, the stress and deformation of the rotor punching plate can improve the mechanical strength of the rotor punching plate, enhance the reliability of the motor, solve the problem that the mechanical strength of the rotor punching plate cannot meet the requirements at high speed, and realize low magnetic flux leakage and high strength. motor design.

In a possible design, further, part of the punching body between the two straight slot sections constitutes a first magnetic isolation bridge, and the ratio of the width w of the first magnetic isolation bridge to the radius R of the punching body is greater than 0.012 , less than 0.02.

In this design, both magnet slots have a first slot end close to the shaft hole, the two first slot ends respectively have a straight slot segment, and part of the punch body between the two straight slot segments forms the first spacer Magnetic bridge, the ratio (w/R) between the width w of the first magnetic isolation bridge and the radius R of the punch body satisfies the above relationship, so that the distribution of the rotor magnetic field can be optimized, and the electromagnetic field of the motor with the rotor punch can be significantly improved. Torque, effectively improve the magnetic leakage and demagnetization of the permanent magnet located in the magnet slot, disperse the centrifugal stress around the magnet slot when the rotor punching is working at high speed, thus solving the problem of the mechanical strength of the rotor punching at high speed. To meet the requirements, realize the design of low magnetic flux leakage and high strength motor, in addition, it can also significantly improve the utilization rate of permanent magnets and the power density of the motor, further improve the working performance of the motor, and improve the user's comfort.

In a possible design, further, the ratio of the width w of the first magnetic isolation bridge to the number of pole pairs p of the rotor blanks is greater than 0.2 and less than 0.5.

In this design, the ratio (w/p) between the width w of the first magnetic isolation bridge and the number of pole pairs p of the rotor punch satisfies the above relationship, so that the rotor magnetic field distribution can be optimized, and the rotor punch with the rotor punch can be significantly improved. The electromagnetic torque of the motor of the chip can effectively improve the magnetic leakage and demagnetization of the permanent magnet located in the magnet slot, and disperse the centrifugal stress around the magnet slot when the rotor punching plate is operating at high speed, thereby solving the problem of the rotor of the motor at high speed. The mechanical strength of the punching sheet is difficult to meet the requirements, and the design of low magnetic flux leakage and high strength motor can be realized. In addition, the utilization rate of the permanent magnet and the power density of the motor can be significantly improved, which further improves the working performance of the motor and improves the user experience. comfort of use.

In a possible design, further, the width of the first magnetic isolation bridge is greater than 0.6 mm.

In this design, by setting the width of the first magnetic isolation bridge to be greater than 0.6 mm, it is ensured that the first magnetic isolation bridge can provide a certain structural strengthening effect for the punching body. When the width of the first magnetic isolation bridge is less than 0.7 mm, On the one hand, the smaller width will increase the processing difficulty. On the other hand, on the basis of satisfying the magnetic isolation requirements, it can also reduce the stress deformation of the rotor punching piece of the compressor motor, enhance the mechanical strength of the rotor punching piece, and improve the reliability of the motor.

In a possible design, further, at least one arc groove segment in the two arc groove segments is a circular arc segment, and the circular arc segment includes a circular arc line located on the axial end surface of the punch body, and the circular arc line is The ratio of the radius of curvature r to the radius R of the punch body is greater than or equal to 0.015 and less than or equal to 0.02.

In this design, each first slot end has a straight slot segment and an arc slot segment connected to both ends of the straight slot segment, that is, the number of arc slot segments is two. It should be noted that the bending degrees of the two arc groove segments may be the same or different. At least one arc slot segment in the two arc slot segments is a circular arc segment, that is, the two arc slot segments include a circular arc segment and a non-circular arc segment, or the two arc slot segments include two arc segments. Further, the arc segment includes a circular arc on the axial end face of the punching body, so that the radius of curvature r of the circular arc and the radius R of the punching body satisfy the above relationship, so that the punching body can be subjected to centrifugal force. The deformation problem at the relatively concentrated position is effectively improved, the mechanical strength of the rotor punching sheet is improved, the reliability of the motor is enhanced, the problem that the mechanical strength of the rotor punching sheet cannot meet the requirements of the motor at high speed is solved, and the low flux leakage and high strength motor are realized. the design of.

In a possible design, further, the radius of curvature of the circular arc is greater than or equal to 0.8 mm.

In this design, the radius of curvature of the arc line satisfies the above-mentioned values, so that the degree of curvature of the groove wall at the first groove end can meet the structural design requirements, so that the deformation problem at the position where the centrifugal force is more concentrated on the punch body can be solved. It is effectively improved, the mechanical strength of the rotor punching sheet is improved, the reliability of the motor is enhanced, the problem that the mechanical strength of the rotor punching sheet is difficult to meet the requirements of the motor at high speed is solved, and the design of low flux leakage and high strength motor is realized.

In a possible design, further, a part of the punch body located between the two magnet slots constitutes an installation area, the magnet slot includes a first straight slot wall near the center of the installation area, and the two first straight slot walls constitute The included angle θ is greater than or equal to 115° and less than or equal to 125°.

In this design, part of the punch body is located between the two magnet slots, and this part of the punch body is called the mounting area. The magnet slot includes a first straight slot wall near the center of the mounting area, and the two magnet slots have two first straight slot walls. It should be noted that when the cross section of the installation area is a geometric figure, the center of the installation area is the center of the geometric figure. When the cross section of the installation area is non-geometric, the center of the installation area is the intersection of the line connecting the two farthest points in the circumferential direction and the line connecting the two farthest points in the radial direction as the center. The included angle θ formed by the two first straight slot walls satisfies the above relationship, so that the direct-axis magnetic circuit and the quadrature-axis magnetic circuit of the motor can be affected, thereby indirectly affecting various performances of the motor. For the output torque of the motor, when θ satisfies the aforementioned relationship, the reluctance torque component and the permanent magnet torque component of the motor can be reasonably distributed, so as to improve the output torque of the motor without increasing the cost of electromagnetic parts. moment. Specifically, the output torque of the motor is composed of the reluctance torque component and the permanent magnet torque component. The permanent magnet torque of the motor is proportional to the amount of the permanent magnet, and the reluctance torque is proportional to the quadrature axis inductance and the direct axis inductance. The ratio of the inductance of the quadrature axis to the direct axis is directly related to the value of θ. Without increasing the amount of permanent magnets, setting the value of θ reasonably can increase the ratio of the quadrature axis inductance to the direct axis inductance of the motor, and improve the Reluctance torque component. For the output of the motor torque of the same magnitude, the permanent magnet torque can be smaller, thereby reducing the amount of permanent magnets, thereby reducing costs.

In a possible design, further, the magnet slot includes a second slot end away from the shaft hole, the distance between the two first slot ends is smaller than the distance between the two second slot ends, and the second slot ends face The interior of the installation area extends, and the part of the punch body located between the second slot end and the outer periphery of the punch body constitutes a second magnetic isolation bridge.

In this design, the magnet slot further includes a second slot end away from the shaft hole, and the second slot end and the first slot end are opposite ends of the magnet slot. Since the number of magnet slots is two, the number of second slot ends is also two. If the distance between the two first slot ends is smaller than the distance between the two second slot ends, the two magnet slots are arranged on the punch body in a V-shape. Further, the second slot end extends toward the inside of the mounting area, and a part of the punch body between the second slot end and the outer periphery of the punch body forms a second magnetic isolation bridge. Since the number of the second slot ends is two, there are two second magnetic isolation bridges and one first magnetic isolation bridge in one installation part. The double magnetic isolation bridge structure can improve the mechanical strength of the rotor punch, optimize the rotor magnetic field distribution, significantly improve the electromagnetic torque of the motor with the rotor punch, and effectively improve the magnetic leakage and demagnetization of the permanent magnet located in the magnet slot. , Disperse the centrifugal stress around the magnet slot of the rotor punching sheet under high speed conditions, thereby solving the problem that the mechanical strength of the rotor punching sheet is difficult to meet the requirements at high speed, and realizing the design of low magnetic flux leakage and high strength motor, in addition, It can also significantly improve the utilization rate of the permanent magnet and the power density of the motor, further improve the working performance of the motor, and at the same time, it can also weaken the torque ripple of the motor to a certain extent, reduce the operating noise of the motor, and improve the user's comfort. On the other hand, the air-gap slot is located on the side of the first end face away from the shaft hole, so that the air-gap slot can effectively improve the magnetic leakage of the punching body without affecting the d-axis and q-axis magnetic circuits of the motor, so as to ensure that the motor has sufficient Permanent magnet torque.

In a possible design, further, the rotor punch further includes an assembly port, the assembly port is provided on the punch body and located between two adjacent mounting portions among the plurality of mounting portions, and the assembly port is used for mounting and connection pieces.

In this design, the rotor punching piece also includes an assembly opening, and an assembly opening is provided between two adjacent installation parts. When a plurality of rotor punching pieces are stacked to form the rotor core, the plurality of assembly openings penetrate in the axial direction to form An assembly through groove is provided, and the connecting piece is passed through the assembly through groove to fasten the plurality of rotor punching pieces. Specifically, the connecting piece is a riveting piece.

According to a second aspect of the present invention, there is provided a rotor iron core, which includes the rotor blanks provided by any of the above designs.

The rotor core provided by the present invention includes the rotor punch provided by any of the above designs, and therefore has all the beneficial effects of the rotor punch, which will not be repeated here.

According to a third aspect of the present invention, there is provided a motor including the rotor core provided by any of the above designs.

The motor provided by the present invention includes the rotor core provided by any of the above designs, and therefore has all the beneficial effects of the rotor core, which will not be repeated here.

In a possible design, further, the two magnet slots of the plurality of rotor punching pieces of the rotor iron core penetrate along the axial direction of the rotor iron core to respectively form slots. The motor further includes two permanent magnets, and the two permanent magnets are arranged in the two slots in a one-to-one correspondence.

In a possible design, further, there is a space between each of the two permanent magnets and the first slot end and/or the second slot end of the rotor die.

In this design, there is a space between each permanent magnet and at least one of the two ends of the slot, and the space can play a magnetic isolation effect, which can further improve the magnetic flux leakage of the permanent magnet located in the magnet slot and Demagnetization phenomenon.

According to a fourth aspect of the present invention, there is provided a compressor including the motor provided by any of the above designs.

The compressor provided by the present invention includes the motor provided by any of the above designs, so it has all the beneficial effects of the motor, which will not be repeated here.

Additional aspects and advantages of the present invention will become apparent in the description section that follows, or will be learned by practice of the present invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of embodiments taken in conjunction with the accompanying drawings, wherein:

FIG. 1 shows a schematic structural diagram of a rotor punching sheet according to an embodiment of the present invention;

FIG. 2 shows a partial schematic diagram of a rotor punching sheet according to an embodiment of the present invention;

FIG. 3 shows a comparison diagram of the radial deformation of the rotor punching piece in an embodiment according to the present invention and the rotor punching piece in the related art;

Fig. 4 shows the overall deformation comparison diagram of the rotor punching piece in an embodiment according to the present invention and the rotor punching piece in the related art;

FIG. 5 shows a comparison diagram of the equivalent stress between the rotor punching sheet in an embodiment of the present invention and the rotor punching sheet in the related art;

FIG. 6 shows a schematic structural diagram of a motor according to an embodiment of the present invention;

7 shows a trend diagram of the ratio of the width of the first magnetic isolation bridge of the rotor punching piece to the radius of the punching piece body and the stress on the rotor according to an embodiment of the present invention;

FIG. 8 shows a schematic structural diagram of a compressor according to an embodiment of the present invention.

Among them, the corresponding relationship between the reference numerals and the component names in Fig. 1 to Fig. 8 is:

100 rotor punches,

110 punch body,

120 shaft holes,

130 mounting part, 130a magnet slot,

131 The first groove end, 131a straight groove section, 131b arc groove section,

132 Second Slot End,

140 first magnetic isolation bridge,

150 installation area,

160 second magnetic isolation bridge,

170 first straight groove wall,

180 assembly port,

200 motors,

210 permanent magnets,

220 stator,

300 compressors,

310 housing.

Detailed ways

In order to understand the above objects, features and advantages of the present invention more clearly, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments may be combined with each other in the case of no conflict.

Many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific details disclosed below. Example limitations.

The rotor blank 100, the rotor core, the motor 200 and the compressor 300 provided according to some embodiments of the present invention are described below with reference to FIGS. 1 to 8 .

Example 1

According to the first aspect of the present invention, as shown in FIGS. 1 and 2 , a rotor punch 100 is provided, which includes a punch body 110 , a shaft hole 120 and a plurality of mounting parts 130 , wherein the shaft hole 120 is provided on the punching body 110 . A plurality of mounting parts 130 are disposed on the punch body 110 around the shaft hole 120 . Each mounting portion 130 of the plurality of mounting portions 130 includes two magnet slots 130a, and each magnet slot 130a of the two magnet slots 130a includes a first slot end 131 close to the shaft hole 120, wherein the first slot end 131 includes a straight The slot segment 131a and the arc slot segment 131b connected to both ends of the straight slot segment 131a.

The rotor punch 100 provided by the present invention includes a punch body 110 , a shaft hole 120 and a plurality of mounting portions 130 . The shaft hole 120 is opened on the punch body 110 , and the punch body 110 is made of silicon steel material. Among them, silicon steel refers to silicon alloy steel with a silicon content of 1.0% to 4.5% and a carbon content of less than 0.08%. Silicon steel has the characteristics of high permeability, low coercivity, and large resistivity, so hysteresis loss and eddy current loss are relatively small. The shaft hole 120 is used for assembling the rotating shaft of the rotor. The plurality of mounting portions 130 are arranged on the punch body 110 around the shaft hole 120. It is worth noting that the structure of each mounting portion 130 of the plurality of mounting portions 130 may be the same or partially the same, and it may be adjusted according to actual needs That's it. Each mounting portion 130 includes two magnet slots 130a, and each magnet slot 130a includes a first slot end 131 close to the shaft hole 120, wherein the slot wall of the first slot end 131 includes a straight slot section 131a and is connected to the straight slot section 131a Arc groove segments 131b at both ends. The straight slot sections 131a of the two first slot ends 131 can ensure that the width of the magnetic isolation bridge between the two straight slot sections 131a will not be too large to affect the demagnetization, flux leakage and utilization of the magnetic steel. By arranging the arc slot segments 131b at both ends of the straight slot segment 131a, the arc slot segments 131b can enhance the structure of the position where centrifugal force is concentrated (the maximum force), reduce the stress and deformation of the rotor under the condition of high rotational speed and high torque of the motor 200, The mechanical strength of the rotor is improved, and the reliability of the motor 200 is enhanced. It should be noted that the location on the punch body 110 where centrifugal force is concentrated refers to the punch body 110 between the arc groove segments 131 b of the two first groove ends 131 . By making the first slot end 131 of each magnet slot 130a close to the shaft hole 120 to include a straight slot segment 131a and an arc slot segment 131b, the present invention can effectively improve the magnetic flux leakage and demagnetization phenomena of the permanent magnet 210 located in the magnet slot 130a. On the basis, it can also reduce the stress and deformation of the rotor punching sheet 100 under the condition of high speed and high torque of the motor 200, improve the mechanical strength of the rotor punching sheet 100, enhance the reliability of the motor 200, and solve the mechanical strength of the rotor punching sheet 100 of the motor 200 at high speed. It is difficult to meet the requirements of the design of the motor 200 with low flux leakage and high strength.

Further, as shown in FIG. 1 , FIG. 2 and FIG. 7 , the part of the punching body 110 located between the two straight groove sections 131 a constitutes the first magnetic isolation bridge 140 , and the width w of the first magnetic isolation bridge 140 is related to the punching The ratio of the radius R of the body 110 is greater than 0.012 and less than 0.02.

In this embodiment, the two magnet slots 130a each have a first slot end 131 close to the shaft hole 120, and the two first slot ends 131 respectively have a straight slot section 131a, and the part between the two straight slot sections 131a The punch body 110 constitutes the first magnetic isolation bridge 140 , and the ratio (w/R) between the width w of the first magnetic isolation bridge 140 and the radius R of the punch body 110 satisfies the above relationship, as shown in FIGS. 3 and 4 . , so that the distribution of the rotor magnetic field can be optimized, the electromagnetic torque of the motor 200 with the rotor punch 100 can be significantly improved, the magnetic leakage and demagnetization of the permanent magnet 210 located in the magnet slot 130a can be effectively improved, and the rotor punch 100 can be dispersed in high Centrifugal stress around the magnet slot 130a in the rotating speed condition, thereby solving the problem that the mechanical strength of the rotor punching sheet 100 of the motor 200 is difficult to meet the requirements at high rotating speed, and realizing the design of the low magnetic flux leakage and high strength motor 200, in addition, it can also make The utilization rate of the permanent magnet 210 and the power density of the motor 200 can be significantly improved, which further improves the working performance of the motor 200 and improves the user's comfort. As shown in FIG. 7 , when the ratio of the width w of the first magnetic isolation bridge 140 to the radius R of the punch body 110 satisfies the above range, the stress on the punch body 110 is less than 230Mpa.

Further, as shown in FIG. 1 and FIG. 2 , the ratio of the width w of the first magnetic isolation bridge 140 to the number of pole pairs p of the rotor punch 100 is greater than 0.2 and less than 0.5.

In this embodiment, the ratio (w/p) between the width w of the first magnetic isolation bridge 140 and the number of pole pairs p of the rotor punch 100 satisfies the above relationship, as shown in FIG. 3 and FIG. 5 , so that it can be The rotor magnetic field distribution is optimized, the electromagnetic torque of the motor 200 with the rotor punch 100 is significantly improved, the flux leakage and demagnetization of the permanent magnets 210 located in the magnet slot 130a are effectively improved, and the rotor punch 100 is dispersed in high-speed operating conditions When the centrifugal stress around the magnet slot 130a is reduced, the problem that the mechanical strength of the rotor punch 100 of the motor 200 is difficult to meet the requirements at high rotation speed is solved, and the design of the motor 200 with low flux leakage and high strength can be realized. In addition, the permanent magnet 210 can be The utilization rate of the motor 200 and the power density of the motor 200 can be significantly improved, which further improves the working performance of the motor 200 and improves the user's comfort.

Further, as shown in FIG. 1 and FIG. 2 , the width of the first magnetic isolation bridge 140 is greater than 0.6 mm.

In this embodiment, by setting the width of the first magnetic isolation bridge 140 to be greater than 0.6 mm, it is ensured that the first magnetic isolation bridge 140 can provide a certain structural strengthening effect for the punching body 110. When the width of the first magnetic isolation bridge 140 When the width is less than 0.7mm, on the one hand, the smaller width will increase the difficulty of processing, and on the other hand, on the basis of satisfying the magnetic isolation requirements, it can also reduce the stress deformation of the rotor punching piece 100 of the compressor 300 motor 200, and strengthen the rotor punching piece 100. The mechanical strength is improved, and the reliability of the motor 200 is improved.

Further, as shown in FIG. 1 and FIG. 2 , at least one arc groove segment 131 b in the two arc groove segments 131 b is a circular arc segment, and the circular arc segment includes a circular arc line located on the axial end surface of the punch body 110 , The ratio of the radius of curvature r of the circular arc to the radius R of the punch body 110 is greater than or equal to 0.015 and less than or equal to 0.02.

In this embodiment, each first slot end 131 has a straight slot segment 131a and an arc slot segment 131b connected to both ends of the straight slot segment 131a, that is, the number of arc slot segments 131b is two. It should be noted that the bending degrees of the two arc groove segments 131b may be the same or different. At least one arc groove segment 131b in the two arc groove segments 131b is a circular arc segment, that is, the two arc groove segments 131b include a circular arc segment and a non-circular arc segment, or the two arc groove segments 131b may include two circular arcs part. Further, the arc segment includes a circular arc on the axial end face of the punching body 110 , so that the radius of curvature r of the circular arc and the radius R of the punching body 110 satisfy the above relationship, so that the punching body 110 can be The deformation problem at the position where the centrifugal force is concentrated is effectively improved, the mechanical strength of the rotor punch 100 is improved, the reliability of the motor 200 is enhanced, and the problem that the mechanical strength of the rotor punch 100 of the motor 200 cannot meet the requirements at high speed is solved, and the realization of Low leakage flux and high strength motor 200 design.

Further, the radius of curvature of the arc line is greater than or equal to 0.8 mm.

In this embodiment, the radius of curvature of the arc line satisfies the above-mentioned values, so that the degree of curvature of the groove wall of the first groove end 131 can meet the structural design requirements, so that the position on the punch body 110 where centrifugal force is more concentrated can be made The deformation problem at the place is effectively improved, the mechanical strength of the rotor punch 100 is improved, the reliability of the motor 200 is enhanced, the problem that the mechanical strength of the rotor punch 100 is difficult to meet the requirements of the motor 200 at high speed is solved, and the low flux leakage and high strength motor are realized. 200 designs.

Further, as shown in FIG. 1 and FIG. 2 , the part of the punch body 110 located between the two magnet slots 130 a constitutes the mounting area 150 . The included angle θ formed by the first straight groove walls 170 is greater than or equal to 115° and less than or equal to 125°.

In this embodiment, a part of the punch body 110 is located between the two magnet slots 130 a, and the part of the punch body 110 is called an installation area 150 . The magnet slot 130a includes a first straight slot wall 170 near the center of the mounting area 150 , and the two magnet slots 130a have two first straight slot walls 170 . It should be noted that, when the cross section of the installation area 150 is a geometric figure, the center of the installation area 150 is the center of the geometric figure. When the cross section of the installation area 150 is non-geometric, the center of the installation area 150 is the intersection of the line connecting the two farthest points in the circumferential direction and the two points farthest in the radial direction as the center. The included angle θ formed by the two first straight slot walls 170 satisfies the above relationship, so that the direct-axis magnetic circuit and the quadrature-axis magnetic circuit of the motor 200 can be affected, thereby indirectly affecting various performances of the motor 200 . For the output torque of the motor 200, when θ satisfies the aforementioned relationship, the reluctance torque component and the permanent magnet torque component of the motor 200 can be reasonably distributed, so that the motor can be improved without increasing the cost of electromagnets. 200 output torque. Specifically, the output torque of the motor 200 is composed of a reluctance torque component and a permanent magnet torque component, wherein the permanent magnet torque of the motor 200 is proportional to the amount of the permanent magnet 210, and the reluctance torque is proportional to the quadrature inductance and the The ratio of the inductance of the direct axis, and the ratio of the inductance of the quadrature axis and the direct axis is directly related to the value of θ. Without increasing the amount of the permanent magnet 210, setting the value of θ reasonably can increase the quadrature axis inductance of the motor 200 and the direct axis. The ratio of inductance to enhance the reluctance torque component. For the output torque of the motor 200 of the same size, the permanent magnet torque may be smaller, thereby reducing the amount of the permanent magnet 210, thereby reducing the cost.

Embodiment 2

On the basis of the foregoing embodiments, as shown in FIGS. 1 and 2 , in this embodiment, a specific description is made for the second slot end 132 of the magnet slot 130 a away from the shaft hole 120 . Further, the magnet slot 130 a includes a distance away from the shaft hole. In the second slot end 132 of the 120, the distance between the two first slot ends 131 is smaller than the distance between the two second slot ends 132, and the second slot end 132 extends toward the interior of the mounting area 150 and is located at the second slot end A portion of the punch body 110 between 132 and the outer periphery of the punch body 110 constitutes the second magnetic isolation bridge 160 .

In this embodiment, the magnet slot 130a further includes a second slot end 132 away from the shaft hole 120, and the second slot end 132 and the first slot end 131 are opposite ends of the magnet slot 130a. Since the number of the magnet slots 130a is two, the number of the second slot ends 132 is also two. If the distance between the two first slot ends 131 is smaller than the distance between the two second slot ends 132 , the two magnet slots 130 a are arranged on the punch body 110 in a V-shape. Further, the second slot end 132 extends toward the inside of the mounting area 150 , and a part of the punch body 110 between the second slot end 132 and the outer periphery of the punch body 110 forms a second magnetic isolation bridge 160 . Since the number of the second slot ends 132 is two, there are two second magnetic isolation bridges 160 and one first magnetic isolation bridge 140 in one mounting portion 130 . The double magnetic isolation bridge structure can improve the mechanical strength of the rotor punch 100, optimize the rotor magnetic field distribution, significantly improve the electromagnetic torque of the motor 200 with the rotor punch 100, and effectively improve the permanent magnet 210 located in the magnet slot 130a. The phenomenon of magnetic flux leakage and demagnetization disperses the centrifugal stress around the magnet slot 130a of the rotor punch 100 under high rotational speed conditions, thereby solving the problem that the mechanical strength of the rotor punch 100 of the motor 200 is difficult to meet the requirements under high rotational speed, and achieving low magnetic flux leakage With the design of the high-strength motor 200, in addition, the utilization rate of the permanent magnet 210 and the power density of the motor 200 can be significantly improved, further improving the working performance of the motor 200, and at the same time, it can also reduce the torque ripple of the motor 200 to a certain extent. , reducing the running noise of the motor 200 and improving the user's comfort; on the other hand, the air gap groove is located on the side of the first end face away from the shaft hole 120, so as to ensure that the air gap groove can effectively improve the magnetic flux leakage of the punching body 110 at the same time. , does not affect the d-axis and q-axis magnetic circuits of the motor 200 , and ensures sufficient permanent magnet torque of the motor 200 .

Further, as shown in FIGS. 1 and 2 , the rotor punch 100 further includes an assembly port 180 , and the assembly port 180 is disposed on the punch body 110 and located between two adjacent mounting portions 130 among the plurality of mounting portions 130 . , the assembly port 180 is used to install the connector.

In this embodiment, the rotor punch 100 further includes an assembly opening 180, and the assembly opening 180 is provided between the two adjacent mounting parts 130. When a plurality of rotor punches 100 are stacked to form a rotor core, the plurality of assembly openings 180 penetrates in the axial direction to form an assembly through groove, and the connecting piece is passed through the assembly through groove to fasten the plurality of rotor punching pieces 100 together. Specifically, the connecting piece is a riveting piece.

Embodiment 3

According to a second aspect of the present invention, a rotor iron core is provided, including the rotor punch 100 provided in any of the above embodiments.

The rotor core provided by the present invention includes the rotor punch 100 provided by any of the above designs, and therefore has all the beneficial effects of the rotor punch 100, which will not be repeated here.

The rotor punch 100 provided by the present invention includes a punch body 110 , a shaft hole 120 and a plurality of mounting portions 130 . The shaft hole 120 is opened on the punch body 110 , and the punch body 110 is made of silicon steel material. Among them, silicon steel refers to silicon alloy steel with a silicon content of 1.0% to 4.5% and a carbon content of less than 0.08%. Silicon steel has the characteristics of high permeability, low coercivity, and large resistivity, so hysteresis loss and eddy current loss are relatively small. The shaft hole 120 is used for assembling the rotating shaft of the rotor. The plurality of mounting portions 130 are arranged on the punch body 110 around the shaft hole 120. It is worth noting that the structure of each mounting portion 130 of the plurality of mounting portions 130 may be the same or partially the same, and it may be adjusted according to actual needs That's it. Each mounting portion 130 includes two magnet slots 130a, and each magnet slot 130a includes a first slot end 131 close to the shaft hole 120, wherein the slot wall of the first slot end 131 includes a straight slot section 131a and is connected to the straight slot section 131a Arc groove segments 131b at both ends. The straight slot sections 131a of the two first slot ends 131 can ensure that the width of the magnetic isolation bridge between the two straight slot sections 131a will not be too large to affect the demagnetization, flux leakage and utilization of the magnetic steel. By arranging the arc slot segments 131b at both ends of the straight slot segment 131a, the arc slot segments 131b can enhance the structure of the position where centrifugal force is concentrated (the maximum force), reduce the stress and deformation of the rotor under the condition of high rotational speed and high torque of the motor 200, The mechanical strength of the rotor is improved, and the reliability of the motor 200 is enhanced. It should be noted that the location on the punch body 110 where centrifugal force is concentrated refers to the punch body 110 between the arc groove segments 131 b of the two first groove ends 131 . By making the first slot end 131 of each magnet slot 130a close to the shaft hole 120 to include a straight slot segment 131a and an arc slot segment 131b, the present invention can effectively improve the magnetic flux leakage and demagnetization phenomena of the permanent magnet 210 located in the magnet slot 130a. On the basis, it can also reduce the stress and deformation of the rotor punching sheet 100 under the condition of high speed and high torque of the motor 200, improve the mechanical strength of the rotor punching sheet 100, enhance the reliability of the motor 200, and solve the mechanical strength of the rotor punching sheet 100 of the motor 200 at high speed. It is difficult to meet the requirements of the design of the motor 200 with low flux leakage and high strength.

Embodiment 4

According to a third aspect of the present invention, as shown in FIG. 6 , a motor 200 is provided, including the rotor core provided by any of the above designs.

The motor 200 provided by the present invention includes the rotor core provided by any of the above designs, and therefore has all the beneficial effects of the rotor core, which will not be repeated here.

The rotor punch 100 provided by the present invention includes a punch body 110 , a shaft hole 120 and a plurality of mounting portions 130 . The shaft hole 120 is opened on the punch body 110 , and the punch body 110 is made of silicon steel material. Among them, silicon steel refers to silicon alloy steel with a silicon content of 1.0% to 4.5% and a carbon content of less than 0.08%. Silicon steel has the characteristics of high permeability, low coercivity, and large resistivity, so hysteresis loss and eddy current loss are relatively small. The shaft hole 120 is used for assembling the rotating shaft of the rotor. The plurality of mounting portions 130 are arranged on the punch body 110 around the shaft hole 120. It is worth noting that the structure of each mounting portion 130 of the plurality of mounting portions 130 may be the same or partially the same, and it may be adjusted according to actual needs That's it. Each mounting portion 130 includes two magnet slots 130a, and each magnet slot 130a includes a first slot end 131 close to the shaft hole 120, wherein the slot wall of the first slot end 131 includes a straight slot section 131a and is connected to the straight slot section 131a Arc groove segments 131b at both ends. The straight slot sections 131a of the two first slot ends 131 can ensure that the width of the magnetic isolation bridge between the two straight slot sections 131a will not be too large to affect the demagnetization, flux leakage and utilization of the magnetic steel. By arranging the arc slot segments 131b at both ends of the straight slot segment 131a, the arc slot segments 131b can enhance the structure of the position where centrifugal force is concentrated (the maximum force), reduce the stress and deformation of the rotor under the condition of high rotational speed and high torque of the motor 200, The mechanical strength of the rotor is improved, and the reliability of the motor 200 is enhanced. It should be noted that the location on the punch body 110 where centrifugal force is concentrated refers to the punch body 110 between the arc groove segments 131 b of the two first groove ends 131 . By making the first slot end 131 of each magnet slot 130a close to the shaft hole 120 to include a straight slot segment 131a and an arc slot segment 131b, the present invention can effectively improve the magnetic flux leakage and demagnetization phenomena of the permanent magnet 210 located in the magnet slot 130a. On the basis, it can also reduce the stress and deformation of the rotor punching sheet 100 under the condition of high speed and high torque of the motor 200, improve the mechanical strength of the rotor punching sheet 100, enhance the reliability of the motor 200, and solve the mechanical strength of the rotor punching sheet 100 of the motor 200 at high speed. It is difficult to meet the requirements of the design of the motor 200 with low flux leakage and high strength.

Further, the two magnet slots 130a of the plurality of rotor punching pieces 100 of the rotor iron core penetrate along the axial direction of the rotor iron core to respectively form slots. The motor 200 further includes two permanent magnets 210, and the two permanent magnets 210 are disposed in the two slots in a one-to-one correspondence.

Further, there is a space between each of the two permanent magnets 210 and the first slot end 131 and/or the second slot end 132 of the rotor die 100 .

In this embodiment, there is a space between each permanent magnet 210 and at least one of the two ends of the slot, and the space can play a magnetic isolation effect, which can further improve the permanent magnet 210 located in the magnet slot 130a magnetic flux leakage and demagnetization.

Further, the motor 200 further includes a stator 220 , the stator 220 has an assembly cavity, and the rotor iron core is disposed in the assembly cavity and can rotate relative to the stator 220 .

Embodiment 5

According to a fourth aspect of the present invention, a compressor 300 is provided, as shown in FIG. 8 , including the motor 200 provided by any of the above designs.

The compressor 300 provided by the present invention includes the motor 200 provided by any of the above designs, so it has all the beneficial effects of the motor 200, and details are not repeated here.

Specifically, the compressor 300 is a scroll compressor or a rotary compressor. The compressor 300 includes a casing 310 , the casing 310 forms a cavity, and the motor 200 is accommodated in the casing 310 .

Specifically, the rotor punch 100 provided by the present invention includes a punch body 110 , a shaft hole 120 and a plurality of mounting portions 130 . The shaft hole 120 is opened on the punch body 110 , and the punch body 110 is made of silicon steel material. Among them, silicon steel refers to silicon alloy steel with a silicon content of 1.0% to 4.5% and a carbon content of less than 0.08%. Silicon steel has the characteristics of high permeability, low coercivity, and large resistivity, so hysteresis loss and eddy current loss are relatively small. The shaft hole 120 is used for assembling the rotating shaft of the rotor. The plurality of mounting portions 130 are arranged on the punch body 110 around the shaft hole 120. It is worth noting that the structure of each mounting portion 130 of the plurality of mounting portions 130 may be the same or partially the same, and it may be adjusted according to actual needs That's it. Each mounting portion 130 includes two magnet slots 130a, and each magnet slot 130a includes a first slot end 131 close to the shaft hole 120, wherein the slot wall of the first slot end 131 includes a straight slot section 131a and is connected to the straight slot section 131a Arc groove segments 131b at both ends. The straight slot sections 131a of the two first slot ends 131 can ensure that the width of the magnetic isolation bridge between the two straight slot sections 131a will not be too large to affect the demagnetization, flux leakage and utilization of the magnetic steel. By arranging the arc slot segments 131b at both ends of the straight slot segment 131a, the arc slot segments 131b can enhance the structure of the position where centrifugal force is concentrated (the maximum force), reduce the stress and deformation of the rotor under the condition of high rotational speed and high torque of the motor 200, The mechanical strength of the rotor is improved, and the reliability of the motor 200 is enhanced. It should be noted that the location on the punch body 110 where centrifugal force is concentrated refers to the punch body 110 between the arc groove segments 131 b of the two first groove ends 131 . By making the first slot end 131 of each magnet slot 130a close to the shaft hole 120 to include a straight slot segment 131a and an arc slot segment 131b, the present invention can effectively improve the magnetic flux leakage and demagnetization phenomena of the permanent magnet 210 located in the magnet slot 130a. On the basis, it can also reduce the stress and deformation of the rotor punching sheet 100 under the condition of high speed and high torque of the motor 200, improve the mechanical strength of the rotor punching sheet 100, enhance the reliability of the motor 200, and solve the mechanical strength of the rotor punching sheet 100 of the motor 200 at high speed. It is difficult to meet the requirements of the design of the motor 200 with low flux leakage and high strength.

specific examples

The present invention provides a rotor punch 100, a permanent magnet motor, and a compressor 300 having the motor. The rotor core has a plurality of pairs of magnet slots 130a for the V-shaped permanent magnets 210 to be inserted into. The plurality of magnet slots 130a are symmetrically distributed around the outer circumference of the shaft hole 120 in the rotor core, and each pair of magnet slots 130a is close to the outer circumference of the rotor. A second magnetic isolation bridge 160 is provided on the inner side, and a first magnetic isolation bridge 140 is provided on the adjacent side of each pair of magnet slots 130a. The first magnetic isolation bridge 140 includes a straight slot section 131a, the minimum width of the straight slot section 131a is w, and the radius R of the rotor punch 100 satisfies the following relationship: 0.012≤w/R≤0.02. Among them, it also includes an arc slot segment 131b connected to the straight slot segment 131a, and the arc slot segment 131b is curved with a curvature radius r, which has the following relationship with the radius R of the rotor punch 100: 0.015≤r/R≤0.02, which can be reduced according to the present invention. The high speed of the motor 200 and the stress and deformation of the rotor under the condition of high torque improve the mechanical strength of the rotor and enhance the reliability of the motor 200 .

Further, the first magnetic isolation bridge 140 is on the cross section of each rotor punch 100, and the connection line between the center of each group of magnetic poles and the axis of the rotating shaft of the rotor punch 100 forms a d-axis, passing through the rotor punch 100. A straight line between the center of 100 and the midpoint between two adjacent magnetic poles is set as the q-axis, and the first magnetic isolation bridge 140 coincides with the d-axis axis. Therefore, the stress deformation of the rotor of the motor 200 of the compressor 300 can be effectively reduced, the mechanical strength of the rotor can be enhanced, and the reliability of the motor 200 can be improved.

In the present invention, the term "plurality" refers to two or more, unless otherwise expressly defined. The terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be It is directly connected or indirectly connected through an intermediary. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiment", etc. means that a particular feature, structure, material or characteristic described in connection with the embodiment or example is included in the present invention at least one embodiment or example of . In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (13)

1. a rotor punching piece, is characterized in that, comprises: Punching body; a shaft hole, arranged on the punching body; A plurality of mounting parts are arranged on the punching body around the shaft hole, Each mounting portion of the plurality of mounting portions includes: Two magnet slots, each of the two magnet slots includes a first slot end close to the shaft hole, wherein the first slot end includes a straight slot segment and a slot connected to both ends of the straight slot segment. Arc slot segment. 2. The rotor punching piece according to claim 1, characterized in that, The part of the punching body between the two straight groove sections constitutes a first magnetic isolation bridge, and the ratio of the width w of the first magnetic isolation bridge to the radius R of the punching body is greater than 0.012 and less than 0.02 . 3. The rotor punching piece according to claim 2, characterized in that, The ratio of the width w of the first magnetic isolation bridge to the number of pole pairs p of the rotor punching piece is greater than 0.2 and less than 0.5. 4. The rotor punching piece according to claim 2, characterized in that, The width of the first magnetic isolation bridge is greater than 0.6 mm. 5. The rotor punching piece according to any one of claims 1 to 4, characterized in that, At least one arc groove segment in the two arc groove segments is a circular arc segment, and the circular arc segment includes a circular arc line located on the axial end surface of the punching piece body, and the radius of curvature of the circular arc line is r The ratio to the radius R of the punch body is greater than or equal to 0.015 and less than or equal to 0.02. 6. The rotor punching piece according to claim 5, characterized in that, The radius of curvature of the circular arc is greater than or equal to 0.8 mm. 7. The rotor punching piece according to any one of claims 1 to 4, characterized in that, The part of the punching body between the two magnet slots constitutes an installation area, the magnet slot includes a first straight slot wall close to the center of the installation area, and the two first straight slot walls constitute a The included angle θ is greater than or equal to 115° and less than or equal to 125°. 8. The rotor punching piece according to claim 7, characterized in that, The magnet slot includes a second slot end away from the shaft hole, the distance between the two first slot ends is smaller than the distance between the two second slot ends, and the second slot end faces the The interior of the mounting area extends, and the portion of the punch body between the second slot end and the outer periphery of the punch body constitutes a second magnetic isolation bridge. 9. The rotor punching piece according to any one of claims 1 to 4, wherein the rotor punching piece further comprises: An assembly port is provided on the punching piece body and is located between two adjacent mounting portions among the plurality of mounting portions, and the mounting port is used for mounting the connecting piece. 10 . A rotor core, characterized in that , comprising: the rotor punching piece according to any one of claims 1 to 9 . 11 . 11. A motor, characterized in that, comprising: The rotor iron core according to claim 10, wherein two magnet slots of the plurality of rotor punching pieces of the rotor iron core penetrate along the axial direction of the rotor iron core to respectively form slots; Two permanent magnets, the two permanent magnets are arranged in the two slots in a one-to-one correspondence. 12. The motor of claim 11, wherein There is a space between each of the two permanent magnets and the first slot end and/or the second slot end of the rotor die. 13. A compressor, characterized by comprising: the motor according to claim 11 or 12.

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