TWI693776B - Rotor lamination and rotor assembly using same - Google Patents

Abstract

A rotor lamination applied to a motor is disclosed. The motor has a motor air gap width value, and the rotor lamination includes a main-body portion, a plurality of edges and a plurality of magnet-receiving slots. The center of the main-body portion is located at the axis of the motor. The plurality of edges are disposed around an outside of the main-body. The plurality of magnet-receiving slots are configured to accommodate a plurality of magnets of the motor and disposed around the center of the main-body portion. Each magnet-receiving slot is configured to accommodate the corresponding magnet. The magnet-receiving slot has a slot width value in an outward direction from the axis. The magnet-receiving slot and the corresponding edge at outside of the main-body portion form a magnet depth value. The magnet depth value is greater than the value of a first rate constant multiplied by the slot width value and then subtracted the motor air gap width value, and is less than the value of the first rate constant multiplied by the slot width value and then plus the motor air gap width value.

Description

Rotor lamination and applicable rotor assembly

This case relates to a rotor assembly of a motor, especially a rotor lamination and its applicable rotor assembly.

Generally speaking, the structure of a permanent magnetic electric machine or permanent magnetic motor includes a rotor and a stator. The stator is provided with windings and the rotor is provided with permanent magnets And the rotor can be formed by stacking rotor laminations such as silicon steel sheets. Among them, the magnetic force generated between the stator and the rotor causes the rotor to rotate.

In order to improve the efficiency or efficiency of the motor, it is necessary to increase the torque ratio that can be generated per unit of current. This value is also called Torque Constant (KT). This value is often used to evaluate the efficiency or performance of the motor. When the motor has a larger torque constant KT, only a lower current is required under the same torque requirements, which can effectively reduce the copper wire loss and achieve the effect of improving efficiency.

Traditional permanent magnet motors mostly adopt the design of a flower-petal-shaped rotor, which has multiple slots near the outer diameter of the rotor to organize the magnetic beams, so as to increase the motor torque or reduce the torque. However, when designing the petal-shaped rotor, in order to ensure that the output torque performance (larger torque) can still be maintained under the optimized torque ripple (Torque ripple) condition, the arc depth (Arc depth) ), magnet (Magnet) placement and rib (Rib) size balance. When relying on simulation analysis software, because of the large number of variable factors, it takes a very long time to find the design value to balance the performance, and the rotor size parameters are coupled to each other, which also causes the calculation of the optimal rotor size. The difficulty goes up.

In view of this, it is necessary to provide a rotor lamination and a suitable rotor assembly to solve the problems faced by the conventional technology.

The purpose of this case is to provide a rotor lamination and suitable rotor assembly. Through the value of the motor air gap width and the width of the magnet accommodating groove, the value of the magnet depth between the magnet accommodating groove and the outer periphery of the body part is designed to obtain the minimum torque ripple in the maximum output torque interval, thereby improving the motor The endurance of anti-demagnetization of the output torque of motor achieves the effect of improving motor efficiency.

Another object of this case is to provide a rotor lamination and a suitable rotor assembly. Through the value of the motor air gap width and the width of the magnet accommodating slot, between two adjacent magnet accommodating slots, an arc repairing depth value is designed to be recessed from the outer periphery of the rotor to the rotor axis to maximize the output torque interval Minimal torque ripple is achieved internally, thereby improving the mutual influence of leak flux/flux leakage and air-gap flux distribution/density in the motor to achieve the effect of improving motor efficiency .

A further object of this case is to provide a rotor lamination and its applicable rotor assembly. Through the motor air gap width value and the magnet accommodating groove width value, the first rib width value between the magnet accommodating groove and the arc repairing portion and the second rib width value between two adjacent magnet accommodating grooves are designed to Under the condition of avoiding demagnetization of the magnet by flux weakening control, the magnetic flux leakage caused by the rotor ribs can be effectively reduced to ensure that the rotor assembly provides the best output torque performance, thereby achieving the effect of improving motor efficiency.

Yet another object of this case is to provide a rotor lamination and its applicable rotor assembly. By optimizing the size and parameters, it can simplify the difficulty of design and accelerate the speed of product development.

In order to achieve the foregoing purpose, this case provides a rotor lamination suitable for a motor. The motor has a motor air gap width value. The rotor lamination includes a body portion, a plurality of peripheral edges, and a plurality of magnet accommodating slots. The central assembly of the body part is located on one of the axis of the motor. A plurality of peripheral edges are arranged around the outer side of the body part. The plurality of magnet accommodating slots accommodates a plurality of magnets of the motor relatively in the slot, and the plurality of magnet accommodating slots is provided on the body portion relative to the axis ring, wherein each magnet accommodating slot accommodates the corresponding magnet, and the magnet accommodates The groove has an accommodating groove width value from the axis outward, and a magnet depth value between the magnet accommodating groove and the outer periphery of the body portion, wherein the magnet depth value is greater than a first magnification constant times the accommodating groove width After the value is subtracted from the calculated sum value of the motor air gap width value, and the magnet depth value is less than the first magnification constant multiplied by the accommodating groove width value plus the calculated motor sum air gap width value.

In order to achieve the foregoing purpose, this case also provides a rotor assembly suitable for a motor. The motor has a motor air gap width value. The rotor assembly includes a plurality of magnets and a plurality of rotor laminations. A plurality of rotor laminations are stacked in the direction of one axis of the motor. The rotor lamination includes a body portion, a plurality of peripheral edges, and a plurality of magnet accommodating grooves. The center of the body part is located on the axis. A plurality of peripheral edges are arranged around the outer side of the body part. A plurality of magnet accommodating slots accommodate a plurality of magnets relatively in the slot, and are arranged on the body part with the axis as the center, wherein each magnet accommodating slot accommodates the corresponding magnet, and the magnet accommodating slot is oriented from the axis to the rotor The direction of the outer side of the component has a width value of the accommodating groove, and a magnet depth value is provided between the magnet accommodating groove and the outer periphery of the body portion, wherein the magnet depth value is greater than a first magnification constant times the width of the accommodating groove minus The calculated sum value of the motor air gap width value, and the magnet depth value is less than the first magnification constant multiplied by the accommodating groove width value plus the calculated motor sum air gap width value.

Some typical embodiments embodying the characteristics and advantages of this case will be described in detail in the description in the following paragraphs. It should be understood that this case can have various changes in different forms, and they all do not deviate from the scope of this case, and the descriptions and drawings therein are essentially used for explanation, not for limiting this case.

Please refer to Figures 1 to 5 first. Figure 1 shows the three-dimensional structure of the motor of the preferred embodiment of this case, Figure 2 shows the plane cross-sectional view of the motor structure of Figure 1, and Figure 3 shows the three-dimensional rotor lamination of the preferred embodiment of this case The structural diagram, FIG. 4 shows a top view of the rotor lamination of the preferred embodiment of this case, and FIG. 5 shows a partially enlarged view of the rotor lamination of the preferred embodiment of this case. In this embodiment, the motor 1 at least includes a rotor assembly 2 and a certain subassembly 3. The combination of the rotor assembly 2 and the stator assembly 3 is completed by adopting the method of the outer stator and inner rotor. In this embodiment, the stator assembly 3 has a hollow portion 31 and a plurality of windings 32 corresponding to the plurality of teeth, and the rotor assembly 2 is disposed in the hollow portion 31 of the stator assembly 3. Among them, the rotor assembly 2 and the stator assembly 3 of the motor 1 are assembled to form a motor air gap width value g. Preferably, the motor air gap width g is between 0.25mm and 1.0mm, but this case is not limited to this. In this embodiment, the rotor assembly 2 includes a plurality of magnets 27 and a plurality of rotor laminations 20. The plurality of rotor laminations 20 may be made of silicon steel material, but this case is not limited to this. A plurality of rotor laminations 20 are stacked along an axis C of the motor 1. The axis C is configured as the center of the rotor assembly 2, the rotor assembly 2 rotates around the axis C, and the axis C is also the center of the motor 1. In addition, in the present embodiment, the number of rotor laminations 20, the arrangement distance, and the thickness of a single plate, etc. can be adjusted and changed according to actual application requirements. Each rotor lamination 20 includes a body portion 21, a plurality of peripheral edges 23, and a plurality of magnet accommodating slots 22. The central assembly of the main body 21 is located on the axis C of the motor 1. A plurality of peripheral edges 23 surround the outer side of the body portion 21. The plurality of magnet accommodating grooves 22 are centered on the axis C and symmetrically looped around the body portion 21 and penetrate the body portion 21. After a plurality of rotor laminations 20 are stacked correspondingly along the axis C, the plurality of magnet accommodating slots 22 can relatively accommodate a plurality of magnets 27 in space. In detail, the plurality of magnet accommodating slots 22 respectively contain corresponding magnets 27 in the respective slots. The aforementioned magnet 27 may be, for example, a long cylindrical permanent magnet, but this case is not limited to this. In this embodiment, the number of the plurality of magnet accommodating slots 22 is relative to the number of the plurality of magnets 27, that is, the number of the two is the same, for example, both are 8. Each of the magnet containing slots 22 is equipped with corresponding magnets 27, that is, the eight magnet containing slots 22 and the corresponding eight magnets 27 are respectively centered on the axis C as a center of about 45 degrees Angular symmetry and one-to-one distribution and configuration, but not limited to this. In other embodiments, the number of the plurality of magnet accommodating slots 22 and the number of the plurality of magnets 27 may be 6, 10, 12 for example. In other words, the number of the plurality of magnet accommodating slots 22 and the number of the plurality of magnets 27 in this case can be expressed as 2N, where N is an integer, and N is greater than or equal to 3. In this way, the rotor assembly 2 can provide a 2N pole number design, which will not be repeated here. In addition, the magnet accommodating groove 22 may also accommodate the magnet 27 one-to-many, but it is not limited thereto.

(1) It is worth noting that, as shown in FIGS. 4 and 5, in this embodiment, the magnet accommodating groove 22 is directed from the axis C toward the outside of the rotor assembly 2 (or toward the peripheral edge 23 of the body 21 (Top) has a width T of the accommodating groove, wherein the width T of the accommodating groove is equal to or slightly larger than the thickness of the magnet 27, so that the magnet 27 can be firmly embedded in the corresponding magnet accommodating groove 22 without detaching. Preferably, the accommodating groove width value T is less than 15 times the motor air gap width value g, but this case is not limited to this. In this embodiment, the plurality of peripheral edges 23 are adjacent to each other and surround the body portion 21, that is, the plurality of peripheral edges 23 are disposed around the outer side of the body portion 21. In addition, there is a magnet depth value Md between the magnet accommodating groove 22 and the outer periphery 23 of the body portion 21. In the embodiment, the magnet depth value Md is greater than a first magnification constant K1 multiplied by the accommodating groove width value T minus the motor sum of the air gap width value g, and the magnet depth value Md is less than the first magnification constant K1 multiplication After the slot width value T is added, the calculated sum value of the motor air gap width value g is added. The relationship can be shown as the following formula (1):

(1)

In this embodiment, the first magnification constant K1 is between 1.4 and 1.5. Table 1 is the output torque and torque ripple obtained by simulating different magnet depth values: Table 1

Figure 6 shows the relationship between the output torque of different magnet depth values. Figure 7 reveals the relationship between the torque ripple of different magnet depth values. As shown in FIG. 6 and FIG. 7, when the magnet depth value Md of the rotor lamination 20 design is within the range of formula (1), that is, the magnet depth value Md is greater than a first magnification constant K1 times the accommodating slot width value After T minus the calculated total value of the motor air gap width value g, and the magnet depth value Md is less than the first magnification constant K1 multiplied by the accommodating groove width value T plus the calculated total value of the motor air gap width value g, motor 1 can Within the maximum output torque range, the minimum torque ripple is also obtained. In this way, the resistance to demagnetization of the motor output torque can be improved, thereby achieving the effect of improving the efficiency of the motor.

(2) In addition, please refer to Figure 1 to Figure 5 and Figure 8. FIG. 8 is an enlarged view showing another partial structure of the rotor lamination of the preferred embodiment of this case. In this embodiment, an outer peripheral edge 23a may be further defined between each two adjacent peripheral edges 23, wherein the rotor lamination 20 further includes a plurality of arc repairing portions 24, respectively located between two adjacent magnet accommodating slots 22 (Or between every two adjacent peripheral edges 23), a plurality of outer peripheral edges 23a from the outer side of the body portion 21 are recessed toward the axis C, and there is a between the outer peripheral edge 23a and the bottom edge 24a of the arc repairing portion 24 Arc repair depth value Pd. The arc repair depth value Pd is greater than a second magnification constant K2 multiplied by the accommodation slot width value T minus the motor air gap width value g, and the arc repair depth value Pd is less than the second magnification constant K2 times the accommodation slot After the width value T, add the calculation sum value of the motor air gap width value g. The relationship can be shown as the following formula (2):

(2)

In this embodiment, the second magnification constant K2 is between 0.5 and 0.6. Table 2 is the output torque and torque ripple obtained by simulating different arc depth values: Table 2

Figure 9 shows the relationship between the output torque of different arc repair depth values. Figure 10 is a graph showing the relationship of torque ripple with different arc depth values. As shown in FIG. 9 and FIG. 10, when the arc repair depth value Pd of the rotor lamination 20 is designed within the range of formula (2), the arc repair depth value Pd is greater than a second magnification constant K2 times the accommodating groove After the width value T is subtracted from the calculated total value of the motor air gap width value g, and the arc repair depth value Pd is less than the second magnification constant K2 multiplied by the accommodating groove width value T plus the calculated motor air gap width value g, The motor 1 can be in the range of maximum output torque and at the same time obtain the minimum torque ripple. In this way, the interaction between the magnetic flux leakage of the magnet and the air gap magnetic flux distribution/density in the motor can be improved, thereby achieving the effect of improving the efficiency of the motor.

(3) In addition, please refer to Figure 1 to Figure 5 and Figure 8 and Figure 11. FIG. 11 is an enlarged view showing yet another partial structure of the rotor lamination according to the preferred embodiment of this case. In this embodiment, there is a first rib 25 between each magnet accommodating groove 22 and the corresponding arc repairing portion 24, which extends from the boundary 23 b of the bottom edge 24 a of the arc repairing portion 24 to the magnet accommodating groove 22. The edge 22a has a first rib width Rr. The rib width value Rr is greater than the accommodating groove width value T divided by the accommodating groove width value T and the motor air gap width value g minus 0.5 times the calculated value of the motor air gap width value g, and less than the tolerance The slot width value T is divided by the sum of the container slot width value T and the motor air gap width value g, and is added to the calculated sum of 0.25 times the motor air gap width value g. The relationship can be shown as the following formula (3):

(3)

(4) In addition, in this embodiment, there is a second rib 26 between each two adjacent magnet accommodating grooves 22, and the second rib 26 has a second rib width Rt. The value Rt of the width of the second rib is greater than the width T of the accommodating groove divided by the sum of the width T of the accommodating groove and the value of the motor air gap width g plus the calculated sum of 0.25 times the motor air gap width value g, and less than The value T of the accommodating groove width is divided by the sum of the accommodating groove width value T and the motor air gap width value g, and the sum of the calculation of the motor air gap width value g plus 1.25 times. The relationship can be shown as the following formula (4):

(4)

The first rib width Rr between the magnet accommodating groove 22 and the arc repairing portion 24 and the second rib width Rt between the two adjacent magnet accommodating grooves 22 are designed to avoid weak magnet control on the magnet Under the condition of demagnetization, the magnetic flux leakage caused by the rotor ribs can be effectively reduced to ensure that the rotor assembly 2 provides the best output torque performance, thereby achieving the effect of improving the motor efficiency.

In summary, this case provides a rotor lamination and its applicable rotor assembly. According to the motor air gap width value and the magnet housing groove width, the magnet depth value between the magnet housing groove and the outer periphery of the body part is designed to obtain the minimum torque ripple within the maximum output torque interval, thereby improving the motor Output torque resistance to demagnetization. Through the motor air gap width value and the magnet housing groove width, between two adjacent magnet housing grooves, an arc repair depth value is designed to be recessed from the outer periphery to the axis, so as to be within the maximum output torque range. A minimum torque ripple is obtained, which in turn improves the interaction between the magnetic flux leakage of the magnet and the air gap flux distribution/density in the motor. Through the motor air gap width value and the magnet accommodating groove width value, the first rib width value between the magnet accommodating groove and the arc repairing portion and the second rib width value between two adjacent magnet accommodating grooves are designed, In order to avoid the demagnetization of the magnet by the weak field control, it can effectively reduce the magnetic flux leakage caused by the rotor ribs, ensure that the rotor assembly provides the best output torque performance, and then achieve the effect of improving the efficiency of the motor. By optimizing the size and parameters, it can simplify the difficulty of design and accelerate the speed of product development.

This case may be modified by any person familiar with the technology as a craftsman, but none of them may be as protected as the scope of the patent application.

1: Motor

2: rotor assembly

20: rotor lamination

21: Main body

22: Magnet storage slot

22a: at the edge

23: Perimeter

23a: outer periphery

23b: at the border

24: Arc repair department

24a: bottom edge

25: The first rib

26: Second rib

27: Magnet

3: stator assembly

31: Hollow Department

32: winding

g: Motor air gap width value

C: axis

Md: Magnet depth value

Pd: Arc repair depth value

Rr: First rib width value

Rt: second rib width value

T: accommodating slot width value

Fig. 1 is a perspective structural view of a motor according to a preferred embodiment of this case. FIG. 2 is a plan sectional view showing the structure of the motor in FIG. 1. FIG. 3 is a perspective structural view of the rotor lamination according to the preferred embodiment of this case. FIG. 4 is a top view of the rotor lamination according to the preferred embodiment of this case. FIG. 5 is an enlarged view showing a partial structure of the rotor lamination according to the preferred embodiment of this case. Figure 6 shows the relationship between the output torque of different magnet depth values. Figure 7 reveals the relationship between the torque ripple of different magnet depth values. FIG. 8 is an enlarged view showing another partial structure of the rotor lamination of the preferred embodiment of the present case. Figure 9 shows the relationship between the output torque of different arc repair depth values. Figure 10 is a graph showing the relationship of torque ripple with different arc depth values. FIG. 11 is an enlarged view showing yet another partial structure of the rotor lamination of the preferred embodiment of the present case.

20: rotor lamination

21: Main body

22: Magnet storage slot

23: Perimeter

24: Arc repair department

25: The first rib

26: Second rib

C: axis

Md: Magnet depth value

T: accommodating slot width value

Claims (14)

A rotor lamination is suitable for a motor. The motor has a motor air gap width value. The rotor lamination includes: a body portion, and the center pair of the body portion is located at one axis of the motor; a plurality of peripheral edges, It is arranged around the outer side of the body part; and a plurality of magnet accommodating slots, the plurality of magnet accommodating slots relatively accommodate a plurality of magnets of the motor in the slot, and the plurality of magnet accommodating slots are arranged around the axis In the body part, each of the magnet accommodating grooves accommodates the corresponding magnet, the magnet accommodating groove has a width value of the accommodating groove from the axis outward, and the magnet accommodating groove and the magnet There is a magnet depth value between the periphery corresponding to the outer side of the body portion, wherein the magnet depth value is greater than a first magnification constant multiplied by the accommodating groove width value minus the motor sum value of the motor air gap width value, and the magnet The depth value is less than the first magnification constant multiplied by the width value of the accommodating groove and added to the motor sum of the air gap width value. The rotor lamination according to claim 1, wherein the first magnification constant is between 1.4 and 1.5. The rotor lamination as described in claim 1, further comprising a plurality of arc repairing parts, which are respectively located between two adjacent magnet accommodating grooves, and define an outer peripheral direction from every two adjacent ones of the peripheral edges The axis is recessed and has an arc repair depth value, wherein the arc repair depth value is greater than a second magnification constant multiplied by the accommodating groove width value minus the motor sum of the air gap width value, and the arc repair value The depth value is less than the second magnification constant multiplied by the accommodating groove width value and added to the motor sum of the air gap width value. The rotor lamination according to claim 3, wherein the second rate constant is between 0.5 and 0.6. The rotor lamination according to claim 3, wherein each of the magnet accommodating grooves and the corresponding arc repairing portion has a first rib portion, the first rib portion has a first rib width value, the The value of the width of the first rib is greater than the sum of the width of the accommodating groove divided by the sum of the width of the accommodating groove and the motor air gap width value minus 0.5 times the calculated sum of the motor air gap width value, and the first The rib width value is less than the accommodating groove width value divided by the sum of the accommodating groove width value and the motor air gap width value plus a calculated sum value of 0.25 times the motor air gap width value. The rotor lamination according to claim 5, wherein a second rib is further provided between two adjacent magnet receiving slots, the second rib has a second rib width value, and the second rib The width value is greater than the accommodating groove width value divided by the sum of the accommodating groove width value and the motor air gap width value plus 0.25 times the calculated sum value of the motor air gap width value, and the second rib width value Less than the value of the accommodating groove width divided by the sum of the accommodating groove width value and the motor air gap width value plus 1.25 times the calculated sum value of the motor air gap width value. The rotor lamination according to claim 1, wherein the number of the plurality of magnet accommodating slots is the same as the number of the plurality of magnets, the number is 2N, where N is an integer, and N is greater than or equal to 3. A rotor assembly suitable for a motor having a motor air gap width value, the rotor assembly includes: a plurality of magnets; and a plurality of rotor laminations, stacked in the direction of one axis of the motor, each of which The rotor lamination includes: a body portion, the center of the body portion is located on the axis; a plurality of peripheral edges are arranged around the outer side of the body portion; and A plurality of magnet accommodating slots, the plurality of magnet accommodating slots relatively accommodate the plurality of magnets in the slot, and the ring is set as a center around the body portion, wherein each of the magnet accommodating slots accommodates Of the magnet, the magnet accommodating groove has an accommodating groove width value from the axis toward the outer side of the rotor assembly, and a magnet depth is provided between the magnet accommodating groove and the periphery corresponding to the outer side of the body Value, wherein the magnet depth value is greater than a first magnification constant multiplied by the accommodating groove width value minus the motor sum of the air gap width value, and the magnet depth value is less than the first magnification constant multiplying the accommodating groove After the width value, add the calculated sum value of the motor air gap width value. The rotor assembly according to claim 8, wherein the first rate constant is between 1.4 and 1.5. The rotor assembly according to claim 8, wherein each of the rotor laminations further includes a plurality of arc repairing portions, which are respectively located between two adjacent magnet accommodating grooves, and between each two adjacent peripheral edges Define that an outer periphery is recessed toward the axis to have an arc repair depth value, wherein the arc repair depth value is greater than a second magnification constant multiplied by the accommodating groove width value minus the motor sum of the air gap width value Value, and the value of the arc repair depth is less than the second magnification constant multiplied by the width of the accommodating groove and the sum of the motor air gap width value. The rotor assembly according to claim 10, wherein the second rate constant is between 0.5 and 0.6. The rotor assembly according to claim 10, wherein a first rib is provided between each of the magnet accommodating grooves and the corresponding arc repairing part, the first rib has a first rib width value, and the first A rib width value is greater than the accommodating groove width value divided by the sum of the accommodating groove width value and the motor air gap width value minus 0.5 times the calculated sum value of the motor air gap width value, and the first rib The width of the part is smaller than the width of the accommodating groove The value is divided by the sum of the accommodating groove width value and the motor air gap width value and added to the calculated sum value of 0.25 times the motor air gap width value. The rotor assembly according to claim 12, wherein a second rib is further provided between two adjacent magnet receiving grooves, the second rib has a second rib width value, and the second rib width The value is greater than the value of the accommodating groove width divided by the sum of the accommodating groove width value and the motor air gap width value plus 0.25 times the calculated sum value of the motor air gap width value, and the second rib width value is less than The value of the accommodating groove width is divided by the sum of the accommodating groove width value and the motor air gap width value and added to the calculation sum value of 1.25 times the motor air gap width value. The rotor assembly according to claim 8, wherein the number of the plurality of magnet accommodating slots is the same as the number of the plurality of magnets, the number is 2N, where N is an integer, and N is equal to or greater than 3.

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