A low-loss motor rotor core and its manufacturing method

Abstract

The present invention discloses a low-loss motor rotor core, comprising a yoke portion and a plurality of L-shaped rotor tooth portions; the yoke portion is formed by winding a section of an iron core body along a spiral line trajectory for multiple turns, and the iron core bodies of adjacent turns are in contact with each other; each turn of the iron core body is provided with a plurality of L-shaped iron core pole shoes uniformly distributed along the circumferential direction, the phase angles between the iron core pole shoes of each turn are equal, and the iron core pole shoes corresponding to each turn are stacked in sequence to form the rotor tooth portion; the yoke portion is formed by winding a section of the iron core body along a spiral line trajectory for multiple turns, and the iron core pole shoes on each turn of the iron core body are stacked one by one to form the rotor tooth portion. Compared with the existing iron core structure composed of multiple iron core units stacked together, the motor rotor core manufactured in this way can reduce the waste part by punching, improve the material utilization rate, and reduce the production cost. At the same time, there is no need to separate it into multiple iron core units for stacking, which is more convenient to manufacture, thereby improving production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a low-loss motor rotor core and a manufacturing method thereof. Background Art

[0002] In traditional motor design, the rotor core is usually composed of a series of silicon steel sheets of uniform thickness, which are stacked and fixed to form a complete rotor core; the purpose of this design is to reduce eddy current loss and hysteresis loss, thereby improving the efficiency of the motor.

[0003] However, this structure has problems of low material utilization and high production cost. At the same time, since silicon steel sheets need to be stacked layer by layer, the production efficiency of the rotor core is low. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide a low-loss motor rotor core and a manufacturing method thereof, which can reduce the waste part caused by punching, improve material utilization, and reduce production costs. At the same time, there is no need to separate it into multiple core units for stacking, making it more convenient to manufacture and thus improving production efficiency.

[0005] To achieve the above object, the specific solutions of the present invention are as follows:

[0006] A first aspect of the present invention provides a low-loss motor rotor core, comprising a yoke portion and a plurality of L-shaped rotor tooth portions;

[0007] The magnetic yoke part is formed by winding a section of iron core body along a spiral line trajectory for multiple turns, and the iron core bodies of adjacent turns are in contact with each other; each turn of the iron core body is provided with a plurality of L-shaped iron core pole shoes evenly distributed along the circumferential direction, and the phase angles between the iron core pole shoes of each turn are equal, and the iron core pole shoes corresponding to each turn are stacked in sequence to form the rotor tooth part.

[0008] The present invention further comprises a covering section extending from the lowest iron core pole shoe; the covering section covers the outer side of the rotor tooth portion along the shape of the rotor tooth portion, and the terminal end face of the covering section is flush with the end face of the yoke portion.

[0009] The present invention further provides a first fastening hole at the end of the covering section, and the yoke part provides a second fastening hole corresponding to each covering section; the second fastening hole passes through each circle of the core body; a locking assembly is connected between the first fastening hole and the second fastening hole.

[0010] The present invention further comprises a locking assembly comprising a bolt and a nut; the bolt passes through the first fastening hole and the second fastening hole in sequence from the outside of the covering section toward the center of the yoke part, and the nut is threadedly connected to the bolt and is located on the inner side of the yoke part.

[0011] A second aspect of the present invention provides a method for manufacturing the low-loss motor rotor core as described above, comprising the following steps:

[0012] Pretreatment: Clean, degrease and remove rust on the silicon steel plate to ensure that the surface of the silicon steel plate is clean and flat;

[0013] Punching pole shoes: Based on the machining dimensions of the rotor core, the punching parameters are calculated, including the pole shoe length and pole shoe spacing. Based on the punching parameters, a section of the core body and several groups of steel pole shoes connected to one side of the core body are punched out from the pretreated silicon steel sheet. Each group of steel pole shoes includes multiple steel pole shoes, and the number of groups of steel pole shoes is equal to the number of windings of the rotor core, thereby obtaining the rotor core of the first form.

[0014] Bending process: Using the intersection between the steel pole shoe and the core body as the fulcrum, the steel pole shoe is bent 90 degrees to form an L-shaped core pole shoe, thus obtaining the second form of the rotor core;

[0015] Rolling forming: The second-form rotor core is wound multiple times from the inside to the outside along the spiral line trajectory, and the corresponding core pole shoes between each circle are overlapped in sequence to form the rotor tooth part, thereby obtaining the third-form rotor core.

[0016] The present invention further includes surface treatment: performing rust-proof treatment on the rotor core of the third form.

[0017] The present invention further includes, in the step of punching out the pole shoes, punching out a cladding section extending from the end of the steel sheet pole shoes on the first group of steel sheet pole shoes;

[0018] The method also includes covering and shaping: covering the covering section along the shape of the rotor tooth part on the outer side of the rotor tooth part.

[0019] The present invention further punches out a first fastening hole at the end of each cladding section, and punches out a second fastening hole at the position of each steel sheet pole shoe in the core body; the corresponding first fastening hole and second fastening hole are fixedly connected together by a locking assembly, and then the rotor core is shaped.

[0020] The present invention further comprises a locking assembly comprising a bolt and a nut; the bolt passes through the first fastening hole and the second fastening hole in sequence from the outside of the covering section toward the center of the yoke part, and the nut is threadedly connected to the bolt and is located on the inner side of the yoke part.

[0021] The beneficial effects of the present invention are as follows: the present invention adopts a section of iron core body to be wound multiple times along a spiral line trajectory to form a yoke part, and the iron core pole shoes on each circle of the iron core body are stacked one by one to form a rotor tooth part. Compared with the existing iron core structure composed of multiple iron core units stacked together, the motor rotor core made in this way can reduce the punching waste part, improve material utilization, and reduce production costs. At the same time, there is no need to separate it into multiple iron core units for stacking, which makes it more convenient to manufacture and thus improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the motor rotor core of the present invention;

[0023] Figure 2 is a top view of the rotor core of the motor of the present invention;

[0024] Figure 3 is a cross-sectional view of the rotor core of the motor of the present invention;

[0025] Figure 4 1 is a schematic structural diagram of a motor rotor core according to a first embodiment of the present invention;

[0026] Figure 5 1 is a schematic structural diagram of a motor rotor core according to a second embodiment of the present invention;

[0027] Figure 6 1 is a schematic structural diagram of a motor rotor core according to a third embodiment of the present invention;

[0028] Figure 7 is a schematic diagram of the rotor tooth portion of the present invention;

[0029] Explanation of the accompanying drawings: 1. Yoke part; 11. Core body; 2. Rotor tooth part; 21. Core pole shoe; 22. Coating section; 23. Steel sheet pole shoe; 31. First fastening hole; 32. Second fastening hole; 41. Bolt; 42. Nut. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but the scope of implementation of the present invention is not limited thereto.

[0031] like Figures 1 to 6 As shown, a low-loss motor rotor core according to this embodiment includes a yoke portion 1 and a plurality of L-shaped rotor tooth portions 2;

[0032] The yoke part 1 is formed by winding a section of iron core body 11 along a spiral line trajectory for multiple turns, and the iron core bodies 11 of adjacent turns are in contact with each other; each turn of the iron core body 11 is provided with a plurality of L-shaped iron core pole shoes 21 evenly distributed along the circumferential direction, the phase angles between the iron core pole shoes 21 of each turn are equal, and the length of the iron core pole shoes 21 of each turn gradually increases from the inside to the outside; the iron core pole shoes 21 corresponding to each turn are stacked in sequence to form the rotor tooth part 2.

[0033] In this embodiment, a section of the core body 11 is wound multiple times along a spiral line trajectory to form a yoke portion 1, and the core pole shoes 21 on each circle of the core body 11 are stacked one by one to form the rotor tooth portion 2. Compared with the existing core structure composed of multiple stacked core units, the motor rotor core manufactured in this way can reduce the waste part due to punching, improve material utilization, and reduce production costs. At the same time, there is no need to separate it into multiple core units for stacking, which makes it more convenient to manufacture and thus improves production efficiency.

[0034] like Figure 1 、 Figure 3 and Figure 6 As shown, in some embodiments of the low-loss motor rotor core described in this embodiment, a cladding section 22 extends from the lowest core pole piece 21. This cladding section 22 follows the shape of the rotor tooth section 2 and wraps around the outside of the rotor tooth section 2. The end surface of the cladding section 22 is flush with the end surface of the yoke section 1. The provision of the cladding section 22 in this embodiment enhances the structural stability of the rotor tooth section 2.

[0035] like Figures 1 to 6 As shown, in some embodiments of a low-loss motor rotor core described in this embodiment, a first fastening hole 31 is provided at the end of the cladding section 22, and a second fastening hole 32 is provided in the yoke portion 1 corresponding to each cladding section 22. The second fastening holes 32 extend through each turn of the core body 11, and a locking assembly is connected between the first and second fastening holes 31, 32. By providing the first and second fastening holes 31, 32, the locking assembly secures the yoke portion 1 and the rotor tooth portion 2 together as a single unit, further improving the structural stability of the motor rotor core.

[0036] like Figures 1 to 3 As shown, the low-loss motor rotor core described in this embodiment specifically comprises a locking assembly comprising a bolt 41 and a nut 42. The bolt 41 extends sequentially through the first and second fastening holes 31, 32 from the outside of the cladding section 22 toward the center of the yoke portion 1. The nut 42 is threaded onto the bolt 41 and positioned within the inner side of the yoke portion 1. During manufacture, the bolt 41 is passed through the first and second fastening holes 31, 32, and the nut 42 is then screwed onto the bolt 41, thereby securing the yoke portion 1 and the rotor tooth portion 2 as a single unit, achieving enhanced structural stability.

[0037] like Figures 1 to 7 As shown, this embodiment also provides a method for manufacturing a low-loss motor rotor core, comprising the following steps:

[0038] Pretreatment: Clean, degrease and remove rust on the silicon steel sheet to ensure that the surface of the silicon steel sheet is clean and flat. Specifically, select silicon steel sheets of appropriate specifications as raw materials and perform pretreatment such as cleaning, degreasing and rust removal.

[0039] Punching pole shoes: Calculate the punching parameters based on the machining dimensions of the rotor core. The punching parameters include pole shoe length h, pole shoe spacing d, pole shoe width D, and yoke width b.

[0040] Specifically, the bending radius r n =r0-(n-1)×t, bending length Pole shoe length h n =a0+L n , the number of rotor teeth y = 360° / γ; where n represents the number of rotor turns, n = 1, 2, 3, ...; r n represents the bending radius of the n-th iron core pole shoe; t represents the steel plate thickness; a0 represents the length of the straight section of the rotor tooth; Ln represents the length of the bent portion of the n-th iron core pole shoe; r0 represents the maximum bending radius of the iron core pole shoe; h n It represents the pole shoe length of the iron core pole shoe of the nth turn; γ represents the phase angle between adjacent pole shoes; n, t, r0, D, b, a0, γ are all preset constants;

[0041] According to the above parameters, the pole shoe spacing d of the core pole shoe i =S i ; Where i represents the serial number of the pole shoe spacing, i = 1, 2, 3..., ny-1; S i It is expressed as the arc length of the vortex line between the ith iron core pole shoe and the (i+1)th iron core pole shoe;

[0042] Specifically, the plane vortex line is an Archimedean spiral, and the polar coordinate equation of the Archimedean spiral is r=aθ, which is converted into the rectangular coordinate parametric equation x=aθcosθ, y=aθsinθ, where a is a constant and θ is a parameter.

[0043] For the parametric equations x = x(θ), y = y(θ), the arc length is calculated as:

[0044] calculate and

[0045] Derivative of x = aθ cosθ:

[0046] According to the product rule (uv)'=u'v+uv', where u=aθ and v=cosθ, we can get:

[0047] Derivative of y = aθsinθ:

[0048] Similarly, we can get:

[0049] Will and Substituting this into the arc length formula yields:

[0050]

[0051] for Calculation can be performed by substitution or other integration techniques;

[0052] Let θ = tanu, then dθ = sec 2 udu, we can get:

[0053]

[0054] ∫sec 3 The points of udu are: Substituting θ = tanu back, we get the arc length S i The final expression is:

[0055] Right now:

[0056] Where β = α + γ; thus the arc length S in the given angle interval [α, β] is obtained i ; Then the pole shoe spacing d between each adjacent core pole shoe is obtained i =S i ;

[0057] Then, according to the punching parameters, a section of the core body 11 and several groups of steel pole shoes 23 connected to one side of the core body 11 are punched out from the pretreated silicon steel sheet. Each group of steel pole shoes 23 includes multiple steel pole shoes 23. The number of groups of steel pole shoes 23 is equal to the number of windings of the rotor core, thereby obtaining a rotor core of the first form.

[0058] Bending: Based on the blanking parameters, the steel pole shoe 23 is bent 90 degrees with the intersection between the steel pole shoe 23 and the core body 11 as the fulcrum to form an L-shaped core pole shoe 21, thereby obtaining the second form of the rotor core;

[0059] Rolling: The rotor core of the second form is wound multiple times from the inside to the outside along the spiral line trajectory, and the corresponding core pole shoes 21 between each circle are overlapped in sequence to form the rotor tooth part 2, thereby obtaining the rotor core of the third form.

[0060] In this embodiment, a section of the core body 11 is wound multiple times along a spiral line trajectory to form a yoke portion 1, and the core pole shoes 21 on each circle of the core body 11 are stacked one by one to form the rotor tooth portion 2. Compared with the existing core structure composed of multiple stacked core units, the motor rotor core manufactured in this way can reduce the waste part due to punching, improve material utilization, and reduce production costs. At the same time, there is no need to separate it into multiple core units for stacking, which makes it more convenient to manufacture and thus improves production efficiency.

[0061] The manufacturing method of this embodiment also includes surface treatment: anti-rust treatment of the rotor core of the third form, such as spraying insulating paint or phosphating treatment, to improve the corrosion resistance and insulation performance of the motor rotor core; heat treatment or coating can also be performed to improve the performance and durability of the rotor core.

[0062] In the manufacturing method of this embodiment, in the step of punching out the pole shoes, the cladding section 22 extending from the end of the steel sheet pole shoes 23 is punched out from the first set of steel sheet pole shoes 23;

[0063] It also includes wrapping and shaping: wrapping the wrapping section 22 along the shape of the rotor tooth part 2 on the outside of the rotor tooth part 2; in this way, each core pole shoe 21 is more closely attached to each other, thereby enhancing the structural stability.

[0064] Specifically, the coating section length Z is obtained by the following formula:

[0065] Z=(a0-1 / 2r n+1 )+b+3L n+1 +[(n+1)t-2r n+1 ]; at this time the pole shoe length is h n =a0+L n +Z;

[0066] like Figures 1 to 6 As shown, the manufacturing method of this embodiment is to punch out a first fastening hole 31 at the end of each cladding section 22, and punch out a second fastening hole 32 at the position of each steel sheet pole shoe 23 in the core body 11; the diameter m of the first fastening hole 31 and the second fastening hole 32 is a preset constant; the corresponding first fastening holes 31 and the second fastening holes 32 are fixedly connected together by a locking assembly, so that the yoke part 1 and the rotor tooth part 2 are firmly integrated as a whole, further improving the structural stability of the motor rotor core; and then the rotor core is shaped to ensure the overall roundness and structural stability of the motor rotor core.

[0067] like Figures 1 to 3 As shown in the manufacturing method of this embodiment, the locking assembly includes a bolt 41 and a nut 42. The bolt 41 extends from the outside of the covering section 22 toward the center of the yoke portion 1 through the first fastening hole 31 and the second fastening hole 32, respectively. The nut 42 is threaded onto the bolt 41 and located on the inside of the yoke portion 1. During manufacturing, the bolt 41 is passed through the first and second fastening holes 31 and 32, and the nut 42 is then screwed onto the bolt 41. This secures the yoke portion 1 and the rotor tooth portion 2 as a single unit, providing greater structural stability.

[0068] The above description is only a preferred embodiment of the present invention. Therefore, any equivalent changes or modifications made according to the structure, characteristics and principles described in the scope of the patent application of the present invention are included in the protection scope of the patent application of the present invention.

Claims

1. A low-loss motor rotor core, characterized in that: It includes a yoke portion and a plurality of L-shaped rotor teeth portions; The magnetic yoke portion is formed by winding a plurality of turns of an iron core body along a spiral line trajectory, with adjacent turns of the iron core body abutting against each other; each turn of the iron core body is provided with a plurality of L-shaped iron core pole shoes evenly distributed along the circumference, with the phase angles between the iron core pole shoes of each turn being equal, and the iron core pole shoes corresponding to each turn are stacked in sequence to form the rotor teeth portion; The iron core pole shoe located at the bottom layer is extended with a covering section; the covering section covers the outer side of the rotor tooth portion along the shape of the rotor tooth portion, and the end surface of the covering section is flush with the end surface of the yoke portion; A first fastening hole is provided at the end of the covering section, and a second fastening hole is provided on the yoke part corresponding to each covering section; the second fastening hole passes through each circle of the core body; a locking assembly is connected between the first fastening hole and the second fastening hole.

2. A low-loss motor rotor core according to claim 1, characterized in that: The locking assembly includes a bolt and a nut; the bolt passes through the first fastening hole and the second fastening hole in sequence from the outside of the covering section toward the center of the yoke part, and the nut is threadedly connected to the bolt and is located on the inner side of the yoke part.

3. A method for manufacturing a low-loss motor rotor core according to claim 1, characterized in that: The steps include: Pretreatment: Clean, degrease and remove rust on the silicon steel plate to ensure that the surface of the silicon steel plate is clean and flat; Punching pole shoes: Based on the machining dimensions of the rotor core, the punching parameters are calculated, including the pole shoe length and pole shoe spacing. Based on the punching parameters, a section of the core body and several groups of steel pole shoes connected to one side of the core body are punched out from the pretreated silicon steel sheet. Each group of steel pole shoes includes multiple steel pole shoes, and the number of groups of steel pole shoes is equal to the number of windings of the rotor core, thereby obtaining the rotor core of the first form. Bending process: Using the intersection between the steel pole shoe and the core body as the fulcrum, the steel pole shoe is bent 90 degrees to form an L-shaped core pole shoe, thus obtaining the second form of the rotor core; Rolling forming: The second-form rotor core is wound multiple times from the inside to the outside along the spiral line trajectory, and the corresponding core pole shoes between each circle are overlapped in sequence to form the rotor tooth part, thereby obtaining the third-form rotor core.

4. The manufacturing method according to claim 3, characterized in that It also includes surface treatment: rust-proof treatment of the third-form rotor core.

5. The manufacturing method according to claim 3, characterized in that In the step of punching out the pole shoes, a cladding section extending from the end of the steel sheet pole shoes is punched out on the first group of steel sheet pole shoes; The method also includes covering and shaping: covering the covering section along the shape of the rotor tooth part on the outer side of the rotor tooth part.

6. The manufacturing method according to claim 5, characterized in that A first fastening hole is punched out at the end of each cladding section, and a second fastening hole is punched out at a position corresponding to each steel sheet pole shoe in the core body; The corresponding first fastening holes and the second fastening holes are fixedly connected together by a locking assembly, and then the rotor core is shaped.

7. The manufacturing method according to claim 6, characterized in that The locking assembly includes a bolt and a nut; the bolt passes through the first fastening hole and the second fastening hole in sequence from the outside of the covering section toward the center of the yoke part, and the nut is threadedly connected to the bolt and is located on the inner side of the yoke part.

Images