CN214506684U - Stator-rotor core structure for brushless direct current motor - Google Patents
Stator-rotor core structure for brushless direct current motor Download PDFInfo
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- CN214506684U CN214506684U CN202120427559.8U CN202120427559U CN214506684U CN 214506684 U CN214506684 U CN 214506684U CN 202120427559 U CN202120427559 U CN 202120427559U CN 214506684 U CN214506684 U CN 214506684U
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Abstract
The utility model relates to a stator and rotor core structure for a brushless DC motor, which comprises a rotor core and a stator core which is concentric with the rotor core and sleeved outside the rotor core; the stator core comprises Z tooth parts with the width of a, wherein the tooth parts extend to the direction of the center of the circle of the stator core in the radial direction, the crown parts are arranged at one end, close to the center of the circle, of the tooth parts and are symmetrical along the radial center line of the tooth parts, and the yoke parts are arranged at the other end of the tooth parts and connect the Z tooth parts to form a loop; the teeth are uniformly distributed on a loop of the yoke; the middle section of the inner side of each crown part is provided with an arc section which is superposed with the center point of the stator core; and the crown parts at two sides of the arc section are provided with groove bodies. The utility model aims at overcoming the defect that prior art exists, provide a stator-rotor core structure that brushless DC motor used.
Description
Technical Field
The utility model relates to a decide the rotor core field, especially relate to a decide rotor core structure that brushless DC motor used.
Background
The brushless direct current motor is composed of a motor body and a driver, and is a typical electromechanical integrated product. The brushless direct current motor adopts a semiconductor switching device to realize electronic commutation, namely the electronic switching device replaces a traditional contact commutator and an electric brush; the device has the advantages of high reliability, no reversing spark, low mechanical noise and the like, and is widely applied to high-grade recording seats, video recorders, electronic instruments and automatic office equipment. The brushless direct current motor can generate counter electromotive force (also called counter electromotive force) during electronic commutation, and the unsmooth operation of the motor can generate vibration due to non-sine counter electromotive force or large harmonic component, which is one of the main sources of noise of the brushless direct current motor and is particularly reflected in the aspect of electromagnetic noise.
The conventional counter-potential sine wave design scheme of the brushless direct current motor mostly focuses on the improvement of a rotor, and a surface-mounted magnetic steel bread type design (also called a surface-mounted rotor design) or an embedded magnetic steel multipole design (also called an embedded rotor design) is generally adopted. Wherein, the deficiency of the design scheme of the surface-mounted rotor lies in: the magnetic steel is designed into a bread shape, the cost of the magnetic steel processing technology is high, the design of a magnetic steel sleeve needs to be added to the rotor, and the assembly technology and the cost of the motor are high; the design scheme of the embedded rotor has the defects that the design scheme of a magnetism gathering scheme is adopted, the number of the magnetic steels is increased, and the material cost and the assembly process cost are increased. The improvement points of the two schemes are in the aspect of magnetic steel, and the stator and rotor iron cores are not improved.
Disclosure of Invention
The utility model aims at overcoming the defect that prior art exists, provide a stator-rotor core structure that brushless DC motor used.
Realize the utility model discloses the technical scheme of purpose is: a stator-rotor core structure for a brushless direct current motor comprises a rotor core and a stator core which is concentric with the rotor core and sleeved outside the rotor core; the stator core comprises Z tooth parts with the width of a, wherein the tooth parts extend to the direction of the center of the circle of the stator core in the radial direction, the crown parts are arranged at one end, close to the center of the circle, of the tooth parts and are symmetrical along the radial center line of the tooth parts, and the yoke parts are arranged at the other end of the tooth parts and connect the Z tooth parts to form a loop; the teeth are uniformly distributed on a loop of the yoke; the middle section of the inner side of each crown part is provided with an arc section which is superposed with the center point of the stator core; and the crown parts at two sides of the arc section are provided with groove bodies.
Further, the number Z of the tooth parts is more than or equal to 3; the radial width of the yoke part is b, and b is more than or equal to 0.55 a.
Further, the inner diameter of the stator core formed by the Z arc sections is
And is
The number of teeth Z is 6, the tooth width a is 3.8mm, and the radial width b of the yoke is 3 mm.
Further, the outside of the rotor core has a maximum outer diameter of
N first outer arcs and an outer diameter of
The n second outer arcs are alternately connected; the adjacent first outer circular arc and the second outer circular arc are connected through a straight line segment L; the first outer arc and the inner circle of the rotor core are eccentrically arranged, and the second outer arc and the inner circle of the rotor core are concentrically arranged; q magnetic steel grooves are formed in the rotor iron core; an outer magnetism isolating bridge is formed between the first outer circular arc and the magnetic steel groove; an inner magnetism isolating bridge is formed in a connecting area between the end parts of two adjacent magnetic steel grooves; the straight line section L is parallel to the outer wall of the straight line section of the magnetic steel groove, and the width of the straight line section L is set to be 0.4-0.8 mm.
Further, the eccentric distance between the first outer circular arc and the inner circle of the rotor core is d and
further, q is an integer multiple of 2; the Z/is an irreducible score; and m is the number of motor phases.
Further, the number n of the first outer circular arcs and the number q of the second outer circular arcs are 4.
Further, the width of the outer magnetic isolation bridge is d1, and the length of the outer magnetic isolation bridge is L1; the d1 is set to be 0.4-0.8 mm, and L1 is more than 1.2d 1; the width of the inner magnetic isolation bridge is d2, and the length of the inner magnetic isolation bridge is L2; the d2 is set to be 0.4-0.8 mm, and L2 is more than 1.2d 1.
Further, the width d1 of the outer magnetic isolation bridge is 0.5mm, and the length L1 is 1.7 mm; the width d2 of the inner magnetic isolation bridge is 0.5mm, and the length L2 is 0.9 mm.
Furthermore, an included angle of alpha degree is formed between the center of the inner circle of the rotor core and two intersection points of the first outer circular arc and the straight line segments L at the two ends of the first outer circular arc; the width of the inner side of the magnetic steel groove and the circle center of the inner circle of the rotor core form a beta-degree included angle; the centers of two adjacent inner magnetic isolation bridges form a gamma-degree included angle; the alpha/beta is more than or equal to 0.6 and less than or equal to 0.8, and the beta/gamma is more than or equal to 0.6 and less than or equal to 0.95.
Further, α is 53 °, β is 80 °, and γ is 90 °.
After the technical scheme is adopted, the utility model discloses following positive effect has: in the design of the stator and rotor iron core of the utility model, the slot body 24 has the advantage of reducing the torque of the tooth socket; the design of the stator and rotor iron cores can obtain better optimized back electromotive force waveform.
Drawings
In order that the present invention may be more readily and clearly understood, the following detailed description of the present invention is given in conjunction with the accompanying drawings, in which
FIG. 1 is a schematic diagram of a stator-rotor core structure of the present invention;
fig. 2 is a schematic structural view of the stator core of the present invention;
fig. 3 is a schematic structural view of a rotor core according to the present invention;
FIG. 4 is a cogging torque of the motor using a commonly specified rotor core;
FIG. 5 shows the cogging torque of a stator-rotor core motor according to the present invention;
fig. 6 is a line back electromotive force waveform obtained by adopting the stator and rotor cores of the present invention.
The reference numbers in the drawings are as follows: rotor core 10, magnetic steel slot 11, stator core 20, tooth 21, crown 22, arc section 221, yoke 23, slot 24.
Detailed Description
(example 1)
Referring to fig. 1, the present invention includes a rotor core 10 and a stator core 20 concentrically disposed with the rotor core 10 and sleeved outside the rotor core 10; the stator core 20 comprises Z tooth parts 21 with width a, which are formed by extending towards the center direction of the tooth part in the radial direction, a crown part 22 which is arranged at one end of the tooth part 21 close to the center and is symmetrical along the radial center line of the tooth part 21, and a yoke part 23 which is arranged at the other end of the tooth part 21 and connects the Z tooth parts 21 to form a loop; the teeth 21 are evenly distributed on the loop of the yoke 23; the radially outer surface of the yoke 23 is circular, but is not limited to circular, and may have other shapes; the middle section at the inner side of each crown part 22 is provided with an arc section 221 which is coincident with the central point of the stator core 20; grooves 24 are arranged on the crown portion 22 at both sides of the circular arc section 221. The design advantages of the channel 24 are shown in detail in fig. 4 and 5, and it can be seen from the drawings that the channel 24 facilitates better cogging torque reduction.
More specifically, in the present embodiment, the number Z of teeth 21 is 3 or more; the radial width of the yoke 23 is b, and b is not less than 0.55 a.
More specifically in the present embodiment, the stator core 20 formed of the Z arc segments 221 has an inner diameter of
And is
The number Z of teeth 21 is 6, the width a of the teeth 21 is 3.8mm, and the radial width b of the yoke 23 is 63mm。
(example 2)
In the present embodiment, the maximum outer diameter of the rotor core 10 is set to be the outside of embodiment 1
N first outer arcs 1 and an outer diameter of
The n second outer arcs 2 are alternately connected; the adjacent first outer arc 1 and the second outer arc 2 are connected through a straight line segment L; the first outer arc 1 and the inner circle of the rotor core 10 are eccentrically arranged, and the second outer arc 2 and the inner circle of the rotor core 10 are concentrically arranged; q magnetic steel slots 11 are arranged in the rotor core 10; an outer magnetic isolation bridge is formed between the first outer circular arc 1 and the magnetic steel groove 11; an inner magnetism isolating bridge is formed in a connecting area between the end parts of two adjacent magnetic steel grooves 11; the straight line section L is parallel to the outer wall of the straight line section of the magnetic steel groove 11, and the width of the straight line section L is set to be 0.4-0.8 mm.
More specifically in the present embodiment, the eccentric distance of the first outer arc 1 from the inner circle of the rotor core 10 is d and
maximum outer diameter
The outer circle outer diameter is formed by connecting the vertexes of the n first outer circular arcs 1.
More specifically in the present embodiment, q is an integer multiple of 2; z/(qm) is an irreducible fraction; m is the number of motor phases.
More specifically, in the present embodiment, the number n-q-4 of the first outer arc 1 and the second outer arc 2.
More specifically, in the present embodiment, the width of the outer magnetic isolation bridge is d1, and the length is L1; d1 is set to be 0.4-0.8 mm, L1 is more than 1.2d 1; the width of the inner magnetic isolation bridge is d2, and the length of the inner magnetic isolation bridge is L2; d2 is set to be 0.4-0.8 mm, L2 > 1.2d 1.
More specifically, in this embodiment, the width d1 of the outer magnetic shield bridge is 0.5mm, and the length L1 is 1.7 mm; the width d2 of the inner magnetic isolation bridge is 0.5mm, and the length L2 is 0.9 mm.
More specifically, in the present embodiment, two intersection points of the first outer arc 1 and the straight line segments L at two ends thereof form an included angle of α degrees with the center of the inner circle of the rotor core 10; the width of the inner side of the magnetic steel slot 11 and the circle center of the inner circle of the rotor core 10 form a beta-degree included angle; the centers of two adjacent inner magnetic isolation bridges form a gamma-degree included angle; alpha/beta is more than or equal to 0.6 and less than or equal to 0.8, and beta/gamma is more than or equal to 0.6 and less than or equal to 0.95.
More specifically, in the present embodiment, α is 53 °, β is 80 °, and γ is 90 °. The effect of the improved rotor core shape is shown in detail in fig. 6, and thus, more optimized back electromotive force can be obtained.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A stator-rotor core structure for a brushless direct current motor comprises a rotor core (10) and a stator core (20) which is concentric with the rotor core (10) and sleeved outside the rotor core (10); the method is characterized in that: the stator core (20) comprises Z tooth parts (21) with the width of a, wherein the tooth parts extend towards the direction of the center of a circle of the stator core in the radial direction, crown parts (22) which are arranged at one end, close to the center of the circle, of the tooth parts (21) and are symmetrical along the radial center line of the tooth parts (21), and yoke parts (23) which are arranged at the other end of the tooth parts (21) and connect the Z tooth parts (21) to form a loop; the teeth (21) are uniformly distributed on a loop of the yoke (23); the middle section of the inner side of each crown part (22) is provided with an arc section (221) which is coincided with the central point of the stator core (20); the crown parts (22) at two sides of the arc section (221) are provided with groove bodies (24); the number Z of the tooth parts (21) is more than or equal to 3; the radial width of the yoke part (23) is b which is more than or equal to 0.55 a.
2. The stator-rotor core structure for a brushless dc motor according to claim 1, wherein: from ZThe inner diameter of a stator core (20) formed by the arc sections (221) is
And is
The number Z of the teeth (21) is 6, the width a of the teeth (21) is 3.8mm, and the radial width b of the yoke (23) is 3 mm.
3. The stator-rotor core structure for a brushless dc motor according to claim 1, wherein: the outside of the rotor core (10) has the maximum outer diameter
N first outer arcs (1) and an outer diameter of
The n second outer arcs (2) are alternately connected; the adjacent first outer arc (1) and the second outer arc (2) are connected through a straight line segment L; the first outer arc (1) and the inner circle of the rotor core (10) are eccentrically arranged, and the second outer arc (2) and the inner circle of the rotor core (10) are concentrically arranged; q magnetic steel grooves (11) are formed in the rotor iron core (10); an outer magnetic isolation bridge is formed between the first outer circular arc (1) and the magnetic steel groove (11); an inner magnetic isolation bridge is formed in a connecting area between the end parts of two adjacent magnetic steel grooves (11); the straight line section L is parallel to the outer wall of the straight line section of the magnetic steel groove (11), and the width of the straight line section L is set to be 0.4-0.8 mm.
4. A stator-rotor core structure for a brushless dc motor according to claim 3, wherein: the eccentric distance between the first outer circular arc (1) and the inner circle of the rotor core (10) is d
5. A stator-rotor core structure for a brushless dc motor according to claim 3, wherein: the q is an integral multiple of 2; said Z/(qm) is an irreducible score; and m is the number of motor phases.
6. The stator-rotor core structure for a brushless dc motor according to claim 5, wherein: the number n of the first outer arcs (1) and the number q of the second outer arcs (2) are 4.
7. A stator-rotor core structure for a brushless dc motor according to claim 3, wherein: the width of the outer magnetic isolation bridge is d1, and the length of the outer magnetic isolation bridge is L1; the d1 is set to be 0.4-0.8 mm, and L1 is more than 1.2d 1; the width of the inner magnetic isolation bridge is d2, and the length of the inner magnetic isolation bridge is L2; the d2 is set to be 0.4-0.8 mm, and L2 is more than 1.2d 1.
8. The stator-rotor core structure for a brushless dc motor according to claim 7, wherein: the width d1 of the outer magnetic isolation bridge is 0.5mm, and the length L1 is 1.7 mm; the width d2 of the inner magnetic isolation bridge is 0.5mm, and the length L2 is 0.9 mm.
9. A stator-rotor core structure for a brushless dc motor according to claim 3, wherein: two intersection points of the first outer circular arc (1) and the straight line segments L at the two ends of the first outer circular arc form an alpha-degree included angle with the center of the inner circle of the rotor core (10); the width of the inner side of the magnetic steel groove (11) and the circle center of the inner circle of the rotor core (10) form a beta-degree included angle; the centers of two adjacent inner magnetic isolation bridges form a gamma-degree included angle; the alpha/beta is more than or equal to 0.6 and less than or equal to 0.8, and the beta/gamma is more than or equal to 0.6 and less than or equal to 0.95.
10. The stator-rotor core structure for a brushless dc motor according to claim 9, wherein: the α is 53 °, β is 80 °, and γ is 90 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120427559.8U CN214506684U (en) | 2021-02-26 | 2021-02-26 | Stator-rotor core structure for brushless direct current motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120427559.8U CN214506684U (en) | 2021-02-26 | 2021-02-26 | Stator-rotor core structure for brushless direct current motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214506684U true CN214506684U (en) | 2021-10-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120427559.8U Active CN214506684U (en) | 2021-02-26 | 2021-02-26 | Stator-rotor core structure for brushless direct current motor |
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|---|---|
| CN (1) | CN214506684U (en) |
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2021
- 2021-02-26 CN CN202120427559.8U patent/CN214506684U/en active Active
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