JP7329109B1 - Motor rotor core structure - Google Patents

Abstract

An object of the present invention is to provide a rotor core structure for a motor. SOLUTION: A motor rotor core structure provided by the present invention is a rotor core structure of a rotary motor in which rotor cores are spaced from each other on the core along a circumferential direction with the motor rotation axis as the center of the circle. A plurality of through-hole-shaped spaces are provided in sequence, and the through-hole-shaped spaces serve as barriers to the magnetic path in the rotor, and for the insertion of a plurality of straight rod-shaped coupling elements made of a non-magnetically conductive material. The lamination state of a plurality of silicon steel plates for forming the iron core is fixed by the connecting element, thereby improving the rigidity of the entire iron core, and deformation or damage of the silicon steel plates due to the centrifugal force of high-speed rotation. The main technical feature is to reduce the possibility of [Selection drawing] Fig. 3

Description

TECHNICAL FIELD The present invention relates to motor technology, and more particularly to a rotor core structure of a motor.

In order to suppress the stress generated in the spindle motor rotor due to the centrifugal force during high-speed rotation, in Patent Document 1, through the shape design of the rotor magnet groove side magnetic barrier hole, the hole wall on the outer diameter side of the magnetic barrier hole is smooth circle. By using the arc shape, the maximum stress acting on the narrowest area between the part and the outer diameter surface of the rotor due to centrifugal force is reduced, and even if the rotor is damaged due to stress concentration when the rotor rotates at high speed, the above By being restricted to the narrowest area, scattering to the stator side is prevented.

At the same time, US Pat. No. 6,200,003 also does not recommend using through-holes through the rotor to provide through-bolt insertion and coupling, as the through-holes become new stress concentration points and reduce the strength of the rotor. clearly pointed out. Regarding the spindle motor, the technical means of increasing the diameter of the spindle of the prior art to improve the rigidity and obtain good machining accuracy is also a relative reduction in the radial thickness of the rotor element surrounding the peripheral side of the spindle. As a result, it is difficult to extend the above-mentioned through-holes and achieve the purpose of consolidating the iron core silicon steel plates with through-bolts within the limited range of radial thickness of the rotor.

United States Patent Publication No. US2014167551A1

SUMMARY OF THE INVENTION The main object of the present invention is to provide a motor rotor core structure that can improve the structural rigidity of the rotor core and make the motor rotor particularly meet the high-speed rotation needs of the spindle motor.

Therefore, in order to achieve the above object, a rotor core structure for a motor provided by the present invention provides a rotor core structure for a rotary motor in which a rotor core is formed on the core along the circumferential direction with the motor rotation axis as the center of the circle. A plurality of through-hole-like spaces spaced apart from each other are sequentially provided, and the through-hole-like spaces serve as barriers for magnetic paths in the rotor, and a plurality of straight bar-like couplings made of a non-magnetically conductive material. By fixing the laminated state of a plurality of silicon steel plates used for inserting elements and constituting the iron core by the coupling elements, the rigidity of the entire iron core is improved, and the silicon steel is strengthened by the centrifugal force of high-speed rotation. The main technical feature is to reduce the possibility of deformation or damage to the steel plate.

Further, each of the plurality of through-hole-shaped spaces includes a through-hole-shaped magnetic barrier space and a through-hole communicating with the magnetic barrier space, and each of the through-hole-shaped spaces is connected to the magnet of the rotor core. The through-hole-like spaces located on both sides of the groove in the circumferential direction and on both sides of the single magnet groove are mirror images of each other with the diameter of the circumference as the mirror image axis, and communicate with the magnet groove through the magnetic barrier space. do.

Here, the magnetic barrier space communicates with the magnet groove through the first side and communicates with the through hole through the second side, the inner diameter of the magnetic barrier space on the first side being larger than the inner diameter on the second side, and the circular A specific shape for a magnetic barrier with equal inner diameter variations in radial cross-section around the circumference can be a triangular planar geometry.

At the same time, the inner diameter of the second side of the magnetic barrier space is also smaller than the inner diameter of the through-hole, so that the coupling element inserted through the through-hole is radially into the magnetic barrier space via the communicating portion between the magnetic barrier space and the through-hole. The lack of directional displacement has the effect of constraining and positioning the coupling element.

The inner diameter of the communicating portion between the magnetic barrier space and the magnet groove is smaller than the inner diameter of the first side of the magnetic barrier space, and is also smaller than the height of the groove space in the radial direction of the circumference of the magnet groove. Since the fitted magnet is prevented from being displaced into the magnetic barrier space via the communicating portion between the magnet groove and the magnetic barrier space, the effect of constraining and positioning the magnet in the magnet groove is achieved.

1 is a three-dimensional view of a preferred embodiment of the present invention; FIG. 2 is a cross-sectional view of FIG. 1 of the preferred embodiment of the present invention; FIG. Figure 3 is an enlarged view of partial area K of Figure 2 of a preferred embodiment of the invention; Figure 3 is an enlarged view of partial area K of Figure 2 of a preferred embodiment of the invention;

The rotor core structure of the motor described below through preferred embodiments of the present invention takes the rotor element of the spindle motor for the purpose of high-speed rotation as an example. The parts that do not interfere with the disclosure of the present invention are not described in the following description, but these omitted parts belong to the prior art known to those who have ordinary knowledge in the technical field to which the present invention belongs before the filing of the present invention. , its omission does not affect the completeness of the disclosure of the main technical features of the present invention.

As shown in FIGS. 1 and 2, the rotor core structure 10 of the motor provided in the preferred embodiment of the present invention mainly consists of a core 20 and a plurality of hole-shaped magnet grooves 30 paired together. a plurality of magnetic barrier spaces 40 , a plurality of through holes 50 and a plurality of coupling elements 60 .

The iron core 20 is a cylindrical tubular body formed by sequentially laminating a plurality of annular silicon steel plates coaxially. and an annular surface 22, the radial cross-sectional shape of the inner diameter annular surface 21 may be circular, and the radial cross-sectional shape of the outer diameter annular surface 22 may be circular, as disclosed in this embodiment. A plurality of first circular arcs 221 and a plurality of second circular arcs 222 with two different arc degrees may be alternately connected, and the center of curvature of the outer ring surface 22 may be the center of the circle of the inner ring surface 21. Coaxial or parallel.

Each of the magnet grooves 30 penetrates the iron core along the central axis direction of the circle of the inner diameter ring surface 21 and is interposed between the inner diameter ring surface 21 and the outer diameter ring surface 22. , a magnet (not shown) is accommodated through the groove space of each magnet groove 30, the accommodated magnet is positioned through the groove wall of each magnet groove 30, and the magnets are tightly packed inside the iron core 20. be fitted. However, the specific shape of the magnet groove 30 is not a technical feature of the present application, so it will not be described in detail in this specification.

The magnetic barrier spaces 40 are adjacent to each of the magnet grooves 30 in pairs with the diameter of the inner ring surface 21 as the mirror image axis, and extend along the central axis direction of the circle of the inner ring surface 21. It penetrates through the hole-like structure on the iron core 20 and communicates with adjacent magnet grooves 30 by first sides 41 respectively.

The through-holes 50 extend along the central axis direction of the circle of the inner ring surface 21 and penetrate through the iron core 20, and are paired with the second sides 42 of the magnetic barrier spaces 40 that are paired. communicate.

Referring to FIG. 4, each of the coupling elements 60 has a straight rod-like body 61 made of a non-magnetic material (such as stainless steel or aluminum), and is inserted into each through-hole 50 to form a shaft. Both ends of the core 20 protrude from the end surfaces of both ends of the tube shaft of the iron core 20, and both ends (not shown) are positioned outside the both ends of the tube shaft of the iron core 20 and fixed to both ends of the shaft of the body 61, respectively. and force is applied to the silicon steel plates to maintain the laminated state between the silicon steel plates, and at the same time, the physical properties of non-magnetic conductivity allow the hole space of the through hole 50 to maintain the effect of interfering with the magnetic path.

In order to describe the coupling space form between each magnet groove 30, the magnetic barrier space 40 and the through hole 50, please refer to FIG. 41 communicates with the magnet groove 30 , the inner diameter of the communication area 411 is smaller than the inner diameter of the first side 41 , and the magnetic barrier space 40 is defined by the second side 42 . By making the inner diameter of the connecting passage 421 formed by connecting with a part of the through hole 50 smaller than the inner diameter D of the through hole 50, the magnet groove 30, the magnetic barrier space 40 and At the same time when the through holes 50 communicate with each other, the magnets fitted in the magnet grooves 30 and the body portion 61 inserted into the through holes 50 are connected to the magnetic barrier space 40 via the communication region 411 or the communication passage 421 . can be prevented from being displaced to

Here, the specific shape of the through hole 50 in this embodiment is such that the cross section in the radial direction has a circular shape, and the cross sectional shape in the radial direction of the body portion 61 has a complementary circular shape. The body wall portion on the peripheral side of the portion 61 is fitted correspondingly to the hole wall of the through hole 50, so that the fitting between the body portion 61 and the through hole 50 can be stabilized. In other embodiments, the shape of the through-holes can be different from the planar geometric shape of this embodiment, such as elliptical or polygonal.

In addition, the cross-sectional shape of the magnetic barrier space 40 in the radial direction is triangular, and the first side 41 defines a first side of the triangle. The second side of the triangle is defined by 43, the third side of the triangle is defined by the outer hole wall 44 near the outer diameter ring surface 21 of the magnetic barrier space 40, and the connecting passage 421 is formed within the range of the third side. be positioned at

Due to the configuration of the components described above, the rotor core structure 10 of the motor has the coupling element 60 inserted through the through-hole 50, so that the laminated silicon steel plates are closely coupled to achieve a good fixing effect. , the magnetic barrier effect formed by the through hole 50 and the magnetic barrier space 40 can be maintained in order to improve the rigidity of the core and limit the non-magnetic property of the coupling element 60, so that the motor The rotor core structure 10 can combine core strength and electromagnetic properties, making a clear advance over the prior art.

Further, referring to FIG. 3, in order to obtain better mechanical properties from the rotor core structure 10 of the motor, the present application further studies the dimensions of the magnetic barrier space 40 and the through holes 50, and the dimensions are shown in Table 1 below. The data presented demonstrate that the present application has good performance in terms of safety factor compared to the prior art.

In the table above:
B is a first included angle between the inner hole wall 43 of the magnetic barrier space on the radial direction of the iron core 20 and the inner groove surface 31 near the inner ring surface 21 of the adjacent magnet groove 30; is defined as
C is a second included angle and is defined as the interior angle between the inner hole wall 43 and the outer hole wall 44 of the magnetic barrier space above the core 20 in the radial direction.

150°≦B≦190° and 16°≦C≦35° are satisfied between the magnetic barrier space 40 and the communicating magnet groove 30, and
The through hole 50 satisfies the following formula (I).

where D is the diameter of the through-hole 50 and Ro is the radius of the second arc 222 . The magnetic barrier space 40 and the communicating through hole 50 satisfy the following formula (II).

where F is the width of the magnetic barrier, defined as the linear distance between each magnetic barrier space 40 communicating with each other, the first side 41 of each through hole 50 and the center of curvature of the through hole 50; and Ro is the radius of said second arc 222;

As shown in Table 1 above, the rotor core structure 10 of the motor can increase the safety factor to 1.01 or more, and by improving the rigidity of the core 20 during high-speed rotation, the action of centrifugal force deformation or damage that may occur underneath can be reduced.

10 Motor Rotor Core Structure 20 Iron Core 21 Inner Circular Surface 22 Outer Circular Surface 221 First Arc 222 Second Arc 30 Magnet Groove 40 Magnetic Barrier Space 41 First Side 411 Communication Area 42 Second Side 421 Communication Passage 43 Inner Hole wall 44 outer hole wall 50 through hole 60 coupling element 61 body portion B first included angle C second included angle D inner diameter of through hole F width of magnetic barrier Ro radius of second arc

Claims (9)

It has an inner ring surface (21) and an outer ring surface (22), wherein the outer ring surface (22) comprises a plurality of first circular arcs (221) and a plurality of second circular arcs (222) having different arc degrees. An iron core (20) having an annular shape and formed by sequentially laminating a plurality of annular silicon steel plates, each of which is alternately connected to each other;
spaced apart from each other, interposed between the inner diameter annular surface (21) and the outer diameter annular surface (22) of the iron core (20), respectively, in the axial direction of the curvature center of the inner diameter annular surface (21) of the iron core (20) a plurality of magnet grooves (30) extending in parallel and penetrating the iron core (20);
each extends in parallel with the axial direction of the center of curvature of the inner diameter ring surface (21) of the iron core (20), penetrates the iron core (20), and is spaced from both sides in the radial direction of each of the magnet grooves (30). a plurality of paired through holes (50) for placing;
Extending parallel to the axial direction of the center of curvature of the inner diameter ring surface (21) of the iron core (20) and respectively penetrating the iron core (20), each pair of through holes on both sides of each of the magnet grooves (30) holes (50) respectively interposed therebetween, communicating with said magnet groove (30) by a first side (41) and communicating with said through hole (50) by a second side (42). , a plurality of paired magnetic barrier spaces (40);
Each is inserted through each of the through holes (50) and fixed, applies a force facing each other to both ends of the iron core (20) in the axial direction, and is made of a non-magnetic material that acts on the laminated silicon steel plates, A rotor core structure (10) for a motor, comprising a coupling element (60) having a straight bar shape,
the hole wall of each through hole (50) is in close contact with the outer peripheral surface of each of the coupling elements (60) passing through the hole space;
the inner diameter of each said first side (41) is greater than the inner diameter of each said second side (42);
the inner diameter of each said first side (41) is greater than the inner diameter of the communicating region between each said first side (41) and each said magnet groove (30);
the inner diameter of the passage connecting each said second side (42) and said through hole (50) is smaller than the inner diameter of each said through hole (50);
Motor rotor core structure. The through hole (50) according to claim 1, wherein the through hole (50) satisfies the following formula (I), and each of the through holes (50) communicating with each of the magnetic barrier spaces (40) satisfies the following formula (II): Motor rotor core structure.
(I)
[In the formula,
D is the hole diameter of the through hole (50),
Ro is the radius of said second arc (222);
F is the linear distance between each said magnetic barrier space (40) communicating with each other and said first side (41) of each said through hole (50) and the curvature center position of said through hole (50); Each of the magnetic barrier spaces (40) has a triangular shape, with the first side (41) defining the first side of the triangle, the inner hole wall (43) defining the second side of the triangle, and the outer hole 2. A wall (44) defines a third side of a triangle, and each of said through holes (50) communicating with each of said magnetic barrier spaces (40) is located within each said third side. 3. The rotor core structure of the motor according to . In the radial direction of the iron core (20), an inner hole wall (43) of the magnetic barrier space (40) near the inner diameter ring surface of the core and an outer hole near the outer diameter ring surface of the magnetic barrier space (40) A motor rotor core structure according to claim 1, wherein the internal angle (C) with the wall (44) ranges from 16° to 35°. on the inner ring surface (21) of the magnet groove (30) adjacent to the inner hole wall (43) near the inner ring surface of the core in the magnetic barrier space (40) in the radial direction of the iron core (20). The rotor core structure of a motor according to claim 1, wherein the internal angle (B) between the near inner tank surface is in the range of 150° to 190°. Each said coupling element (60) includes a straight rod-like body (61) passing through said through-hole, and two ends positioned outside both ends in the axial direction of the iron core, each said end being connected to said body The rotor core structure of a motor as claimed in claim 1, which is fixed with the body end of the part (61). A motor rotor core structure according to claim 1, wherein the radial cross-section of each said through-hole (50) presents a circular planar geometry. A motor rotor core structure according to claim 1, wherein the radial cross-section of each said through-hole (50) presents an elliptical planar geometry. A motor rotor core structure according to claim 1, wherein the radial cross-section of each said through-hole (50) presents a polygonal planar geometry.