CN218678591U

CN218678591U - Permanent magnet rotor and motor

Info

Publication number: CN218678591U
Application number: CN202223058400.7U
Authority: CN
Inventors: 刘通; 林侨; 孙学文; 张捷
Original assignee: Shenzhen Hobbywing Technology Co Ltd
Current assignee: Shenzhen Hobbywing Technology Co Ltd
Priority date: 2022-11-16
Filing date: 2022-11-16
Publication date: 2023-03-21
Anticipated expiration: 2032-11-16

Abstract

The embodiment of the utility model provides a relate to motor technical field, especially disclose a permanent magnet rotor and motor, permanent magnet rotor includes: a plurality of permanent magnets; the end face of the rotor core is provided with a plurality of mounting grooves, each mounting groove comprises a first groove part and a second groove part, and the permanent magnets are accommodated in the first groove parts; the second slot part is arranged on two sides of the length direction of the first slot part and is located at one end close to the outer edge of the rotor core, the second slot part is used for filling adhesive, the permanent magnet arranged in the first slot part can be fixed by the second slot part filled with the adhesive, and the shaking amplitude of the permanent magnet during high-speed rotation is reduced. The material of the adhesive is non-metal and non-magnetic, so that the leakage flux of the permanent magnet caused by the magnetic conduction of the adhesive can be avoided. Compare in the surface that the magnetic shoe of rotor attached in rotor core among the prior art, bury the permanent magnet in the rotor core in this application to at the fixed permanent magnet of the both ends packing adhesive of permanent magnet, can improve permanent magnet rotor's intensity, can reduce permanent magnet rotor and explode the probability of rotor when high temperature hypervelocity.

Description

Permanent magnet rotor and motor

Technical Field

The embodiment of the utility model provides a relate to the motor field, especially relate to a permanent magnet rotor and motor.

Background

The motor is an important component of the power system of the remote control car, and the motor directly determines the power performance of the remote control car. The permanent magnet motor of the existing remote control car usually adopts an inner rotor type surface-mounted magnetic shoe, namely the magnetic shoe is arranged on the surface of a rotor core. The permanent magnet motor adopting the inner rotor type surface-mounted magnetic shoe is easy to explode the rotor when rotating at high temperature and high speed, thereby greatly reducing the service life of the permanent magnet motor.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a main technical problem who solves provides a permanent magnet rotor and motor, aims at solving the phenomenon that interior rotor type table pastes magnetic shoe permanent magnet machine takes place to explode the rotor easily when high temperature is high-speed rotatory.

In order to solve the technical problem, the utility model discloses a technical scheme be: a permanent magnet rotor comprising:

a plurality of permanent magnets;

the end face of the rotor core is provided with a plurality of mounting grooves which are arranged at intervals along the circumferential direction of the rotor core, and the number of the mounting grooves is equal to that of the permanent magnets; the mounting groove comprises a first groove part and a second groove part, and the permanent magnet is accommodated in the first groove part; the second slot part is located first slot part length direction's both sides and is located the one end that is close to rotor core outer fringe, and second slot part and first slot part intercommunication, second slot part are used for filling the adhesive, and the material of adhesive is nonmetal and not lead magnetic.

Optionally, the permanent magnet is magnetic steel, and the length-width ratio of the magnetic steel is 5.3-5.6.

Optionally, a portion of the outer edge of the rotor core, which corresponds to a portion between any two adjacent first slot portions, is recessed towards the inside to form a magnetic isolation bridge; the distance between the outer edges of any two adjacent magnetic isolation bridges is the outer side distance of the magnetic isolation bridge, the width of the first groove part is the inner side distance of the magnetic isolation bridge, and the ratio of the outer side distance of the magnetic isolation bridge to the inner side distance of the magnetic isolation bridge is 1.072-1.092.

Optionally, the distance between two second groove portions of the same mounting groove is a distance of a magnetism isolating hole, and the ratio of the length of the permanent magnet to the distance of the magnetism isolating hole is 1.53-1.72.

Optionally, the edge of the first groove portion, which is away from one end of the second groove portion, is provided with a chamfer, and the distance between the chamfers of any two adjacent second groove portions is 0.4-0.7 mm.

The utility model also provides a motor, include:

a permanent magnet rotor according to any of the preceding claims;

the stator is provided with an installation cavity, and the permanent magnet rotor is rotatably accommodated in the installation cavity.

Optionally, the diameter of the mounting cavity is the inner diameter of the stator, the diameter corresponding to the outer edge of the stator is the outer diameter of the stator, and the ratio of the inner diameter of the stator to the outer diameter of the stator is 0.55-0.58.

Optionally, the end face of the stator is provided with a winding slot, and a distance between a side wall of the winding slot, which is far away from the mounting cavity, and the outer edge of the stator is equal to the thickness of the yoke part; the distance between any two adjacent winding slots is the tooth width, and the ratio of the yoke thickness to the tooth width is 1.3-1.5.

Optionally, an opening is formed in one end, close to the mounting cavity, of the winding groove, and the side walls, close to two ends of the opening, of the winding groove extend horizontally.

Optionally, the outer diameter of the stator is 38 mm to 41 mm;

the motor also comprises a winding, the winding is arranged in the winding slot, the winding is a three-phase integer pitch winding, and the pitch of the winding is 3.

The embodiment of the utility model provides a beneficial effect is: be different from prior art's condition, the utility model provides a permanent magnet rotor, permanent magnet rotor include permanent magnet and rotor core. The permanent magnet is provided in plurality. The terminal surface of rotor core is equipped with the mounting groove, and the axial extension of rotor core is followed to the mounting groove. The mounting groove is equipped with a plurality ofly, and a plurality of mounting grooves set up along rotor core's circumference interval. The number of the mounting grooves is equal to that of the permanent magnets. The mounting groove comprises a first groove part and a second groove part, the shape of the first groove part is matched with that of the permanent magnet, and the permanent magnet is contained in the first groove part. The second slot part is arranged on two sides of the first slot part in the length direction and is positioned at one end close to the outer edge of the rotor core. The second slot part is communicated with the first slot part and used for filling the adhesive, the permanent magnet of the first slot part can be fixed by the second slot part filled with the adhesive, and the shaking amplitude of the permanent magnet during high-speed rotation is reduced. The material of the adhesive is non-metal and non-magnetic, so that the leakage flux of the permanent magnet caused by the magnetic conduction of the adhesive can be avoided. Compare in the surface that the magnetic shoe of rotor attached in rotor core among the prior art, bury the permanent magnet in the rotor core in this application to at the fixed permanent magnet of the both ends packing adhesive of permanent magnet, can improve permanent magnet rotor's intensity, can reduce permanent magnet rotor and explode the probability of rotor when high temperature hypervelocity.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.

Fig. 1 is a schematic structural diagram of a permanent magnet rotor according to an embodiment of the present invention;

FIG. 2 is a front view of FIG. 1;

fig. 3 is a schematic structural diagram of a permanent magnet rotor according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a stator of an electric motor according to an embodiment of the present invention;

FIG. 5 is a top view of FIG. 4;

FIG. 6 is an enlarged schematic view of portion A of FIG. 5;

fig. 7 is a schematic structural diagram of a motor according to an embodiment of the present invention;

fig. 8 is a schematic view of a partial structure of a motor according to an embodiment of the present invention.

Description of reference numerals:

100. a permanent magnet rotor; 1. a permanent magnet; 2. a rotor core; 21. mounting grooves; 211. a first groove portion; 212. a second groove portion; 22. a magnetic isolation bridge; 3. an adhesive; 200. a stator; 2001. a mounting cavity; 2002. a winding slot; 2002a, an opening; 3000. an electric motor.

Detailed Description

To facilitate understanding of the present invention, the present invention will be described in more detail with reference to the accompanying drawings and specific embodiments. It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for descriptive purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 3, the present invention provides a permanent magnet rotor 100, wherein the permanent magnet rotor 100 includes a permanent magnet 1 and a rotor core 2. The permanent magnet 1 is roughly in the shape of a strip, and a plurality of permanent magnets 1 are arranged. Rotor core 2 has a substantially cylindrical shape, and a mounting groove 21 is provided in an end surface of rotor core 2, and mounting groove 21 extends in the axial direction of rotor core 2. The mounting grooves 21 are provided in plural, and the plural mounting grooves 21 are provided at intervals in the circumferential direction of the rotor core 2. The number of the mounting grooves 21 is equal to the number of the permanent magnets 1. The mounting groove 21 includes a first groove 211 and a second groove 212, the shape of the first groove 211 matches the shape of the permanent magnet 1, and the permanent magnet 1 is accommodated in the first groove 211. The second groove portions 212 are provided at both sides of the first groove portion 211 in the longitudinal direction and at one end close to the outer edge of the rotor core 2, that is, two second groove portions 212 are provided in each mounting groove 21. The second groove 212 is substantially triangular, the second groove 212 communicates with the first groove 211, the second groove 212 is filled with the adhesive 3, and the permanent magnet 1 provided in the first groove 211 can be fixed by the second groove 212 filled with the adhesive 3, thereby reducing the wobbling range of the permanent magnet 1 during high-speed rotation. The material of the adhesive 3 is non-metal and non-magnetic, so that the magnetic flux leakage of the permanent magnet 1 caused by the magnetic conduction of the adhesive 3 can be avoided. Compared with the prior art in which the magnetic shoe of the rotor is attached to the surface of the rotor core 2, the permanent magnet 1 is embedded into the rotor core 2, and the adhesive 3 is filled at the two ends of the permanent magnet 1 to fix the permanent magnet 1, so that the strength of the permanent magnet rotor 100 can be improved, and the probability of the permanent magnet rotor 100 exploding the rotor at high temperature and over speed can be reduced.

The magnetic shoe of the surface-attached rotor in the prior art is fixed with the rotor core 2 by glue and aramid fiber, and the production process is complex. The permanent magnet 1 is arranged in the rotor core 2, and compared with the production of a rotor with an attached magnetic shoe surface, one working procedure is reduced, the production working hour of the permanent magnet rotor 100 can be shortened, and the production cost can be reduced.

Referring to fig. 2, in some embodiments, the permanent magnet 1 is a magnetic steel, the magnetic steel is usually AlNiCo (AlNiCo, an abbreviation of AlNiCo), and the magnetic steel is a superhard permanent magnet alloy made of several hard strong metals. The magnetic steel may be composed of iron and aluminum, nickel, cobalt, etc., or may be composed of copper, niobium, tantalum, and the components of the magnetic steel are only illustrated here, and should not be construed as limiting the specific composition of the magnetic steel.

Referring to fig. 3, the ratio of the length a to the width b of the magnetic steel is 5.3 to 5.6, and the magnetic steel adopts the length-width ratio of 5.3 to 5.6, so that the motor mounted with the permanent magnet rotor 100 provided by the present application can exhibit higher motor efficiency and mechanical characteristics, and can also meet the structural strength requirement of the permanent magnet rotor 100.

In some specific embodiments, the length of the magnetic steel is 11.5 mm to 12.3 mm.

Compared with the arc-shaped magnetic shoe, the magnetic steel is rectangular, so that the magnetic steel is easier to process, the waste in the production process of the magnetic steel can be reduced, and the material loss cost can be reduced.

Referring to fig. 1, in some embodiments, a portion of the outer edge of the rotor core 2, which corresponds to a portion between any two adjacent first slot portions 211, is recessed inward to form a magnetic isolation bridge 22, and the magnetic isolation bridge 22 is arranged to prevent the magnetic leakage coefficient of the permanent magnet 1 from being too large, which may result in too low utilization rate of the permanent magnet 1. The distance between the outer edges of any two adjacent magnetic isolation bridges 22 is the distance L1 outside the magnetic isolation bridge 22, the width of the first groove portion 211 is the distance L2 inside the magnetic isolation bridge 22, and the ratio of the distance L1 outside the magnetic isolation bridge 22 to the distance L2 inside the magnetic isolation bridge 22 is 1.072-1.092, so that the motor provided with the permanent magnet rotor 100 provided by the application can show higher motor efficiency and mechanical characteristics.

Referring to fig. 2 and 3, in some embodiments, a distance between two second slot portions 212 of the same mounting groove 21 is a magnet isolation hole distance L3, and a ratio of the length a of the permanent magnet 1 to the magnet isolation hole distance L3 is 1.53 to 1.72, so that a motor mounted with the permanent magnet rotor 100 provided by the present application can exhibit high motor efficiency and mechanical characteristics.

Referring to fig. 2, in some embodiments, an edge of one end of the first groove 211, which faces away from the second groove 212, is provided with a chamfer, and a distance L4 between the chamfers of any two adjacent second grooves 212 is 0.4 mm to 0.7 mm, so that a motor with the permanent magnet rotor 100 provided by the present application exhibits high motor efficiency and mechanical characteristics.

Referring to fig. 1 and 2, since the solid S1 of 0.4 mm to 0.7 mm exists between the chamfers of any two adjacent second slots 212, the solid S1 is a part of the rotor core 2, and the magnetic isolation bridge 22 is connected to the solid S1, the strength of the magnetic isolation bridge 22 can be increased, the magnetic isolation bridge 22 can be prevented from being broken in a high-temperature and over-speed environment, and an effective structural strength guarantee can be provided for the permanent magnet rotor 100 during high-speed rotation.

In a specific embodiment, the permanent magnet rotor 100 is provided with four mounting slots 21 and four magnetic steels, and the four magnetic steels are respectively correspondingly mounted in the first slot portions 211 of the four mounting slots 21.

To sum up, the utility model provides a permanent magnet rotor 100, permanent magnet rotor 100 includes permanent magnet 1 and rotor core 2. The permanent magnet 1 is provided in plurality. The end face of rotor core 2 is provided with mounting groove 21, and mounting groove 21 extends in the axial direction of rotor core 2. The mounting grooves 21 are provided in plural, and the plural mounting grooves 21 are provided at intervals in the circumferential direction of the rotor core 2. The number of the mounting grooves 21 is equal to the number of the permanent magnets 1. The mounting groove 21 includes a first groove 211 and a second groove 212, the shape of the first groove 211 matches the shape of the permanent magnet 1, and the permanent magnet 1 is accommodated in the first groove 211. The second groove 212 is provided on both sides of the first groove 211 in the longitudinal direction and is located at one end close to the outer edge of the rotor core 2. The second groove 212 communicates with the first groove 211, the second groove 212 is filled with the adhesive 3, and the permanent magnet 1 provided in the first groove 211 can be fixed to the second groove 212 filled with the adhesive 3, thereby reducing the wobbling range of the permanent magnet 1 during high-speed rotation. The material of the adhesive 3 is non-metal and non-magnetic, so that the magnetic flux leakage of the permanent magnet 1 caused by the magnetic conduction of the adhesive 3 can be avoided. Compared with the prior art in which the magnetic shoe of the rotor is attached to the surface of the rotor core 2, in the present application, the permanent magnet 1 is embedded in the rotor core 2, and the adhesive 3 is filled at the two ends of the permanent magnet 1 to fix the permanent magnet 1, so that the strength of the permanent magnet rotor 100 can be improved, and the probability of the permanent magnet rotor 100 exploding the rotor at high temperature and over speed can be reduced.

The present invention also provides a motor 3000, please refer to fig. 7 and 8, the motor 3000 includes a stator 200 and the above permanent magnet rotor 100. The specific structure of the permanent magnet rotor 100 can be referred to above, and the specific structure thereof will not be described in detail herein. The stator 200 is substantially cylindrical, the stator 200 is provided with a mounting cavity 2001 in the axial direction, and the permanent magnet rotor 100 is rotatably housed in the mounting cavity 2001.

Referring to fig. 4 and 5, in some embodiments, the diameter of the mounting cavity 2001 is an inner diameter L5 of the stator 200, the diameter corresponding to the outer edge of the stator 200 is an outer diameter L6 of the stator 200, and a ratio of the inner diameter L5 of the stator 200 to the outer diameter L6 of the stator 200 is 0.55 to 0.58, that is, a split ratio of the stator 200 is 0.55 to 0.58, so that the motor 3000 exhibits high motor efficiency and mechanical characteristics.

Referring to fig. 4 and 5, in some embodiments, the end surface of the stator 200 is provided with a winding slot 2002, and the winding slot 2002 has a substantially trapezoidal shape. The distance between the side wall of the winding slot 2002 facing away from the mounting cavity 2001 and the outer edge of the stator 200 is a yoke thickness L7, the distance between any two adjacent winding slots 2002 is a tooth width L8, and the ratio of the yoke thickness L7 to the tooth width L8 is 1.3 to 1.5, so that the motor 3000 can exhibit high motor efficiency and mechanical characteristics.

Referring to fig. 5 and 6, in some embodiments, an opening 2002a is formed at one end of the winding slot 2002 near the installation cavity 2001, and sidewalls of the winding slot 2002 near two ends of the opening 2002a extend horizontally, that is, the sidewalls of the winding slot 2002 at two ends corresponding to the opening 2002a are in a flat shape. The winding slots 2002 are horizontally arranged near the side walls at the two ends of the opening 2002a, so that the die sinking of the stator 200 can be facilitated, and meanwhile, the deformation of the stator 200 during the die sinking can be reduced, thereby facilitating the control of the size of the stator 200.

Referring to fig. 5, in some embodiments, the outer diameter L6 of the stator 200 is 38 mm to 41 mm, which enables the motor 3000 to exhibit high motor efficiency and mechanical characteristics.

In some embodiments, the motor 3000 further includes a winding (not shown) disposed in the winding slot 2002, the winding is a three-phase pitch winding, and the pitch of the winding is 3, so that the motor 3000 has a high output power.

In some embodiments, referring to fig. 4 and 5, the surfaces of stator 200 outside the outer contour (outer arc S2) and the inner contour (inner arc S3) are provided with an insulating coating to enhance the insulation between the windings and stator 200.

In a specific embodiment, the motor 3000 proposed by the present application operates at 7.2 ten thousand revolutions in a high temperature environment of 150 ℃, and the rotor has no abnormality, and can operate at 5.3 ten thousand revolutions under the same condition compared to the existing surface-mounted rotor with the aramid-wound structure. Moreover, the efficiency of the motor 3000 is obviously improved, and the temperature rise of the permanent magnet rotor 100 is reduced by 9 ℃.

It should be noted that the preferred embodiments of the present invention are described in the specification and the drawings, but the present invention can be realized in many different forms, and is not limited to the embodiments described in the specification, and these embodiments are not provided as additional limitations to the present invention, and are provided for the purpose of making the understanding of the disclosure of the present invention more thorough and complete. Moreover, the above technical features are combined with each other to form various embodiments which are not listed above, and all the embodiments are regarded as the scope of the present invention; further, modifications and variations will occur to those skilled in the art in light of the foregoing description, and it is intended to cover all such modifications and variations as fall within the true spirit and scope of the invention as defined by the appended claims.

Claims

1. A permanent magnet rotor, comprising:

a plurality of permanent magnets;

the end face of the rotor core is provided with a plurality of mounting grooves which are arranged at intervals along the circumferential direction of the rotor core, and the number of the mounting grooves is equal to that of the permanent magnets; the mounting groove comprises a first groove part and a second groove part, and the permanent magnet is accommodated in the first groove part; the second groove portion is arranged on two sides of the length direction of the first groove portion and located at one end close to the outer edge of the rotor core, the second groove portion is communicated with the first groove portion, the second groove portion is used for filling adhesive, and the adhesive is made of nonmetal and does not conduct magnetism.

2. The permanent magnet rotor of claim 1 wherein said permanent magnets are magnetic steels having an aspect ratio of 5.3 to 5.6.

3. The permanent magnet rotor according to claim 1, wherein the portion of the outer edge of the rotor core corresponding to the space between any two adjacent first slot portions is recessed towards the inside to form a magnetic isolation bridge; the distance between the outer edges of any two adjacent magnetic isolation bridges is the outer distance of the magnetic isolation bridge, the width of the first groove part is the inner distance of the magnetic isolation bridge, and the ratio of the outer distance of the magnetic isolation bridge to the inner distance of the magnetic isolation bridge is 1.072-1.092.

4. The permanent magnet rotor according to claim 1, wherein the distance between two second slot parts of the same mounting groove is a magnet isolation hole distance, and the ratio of the length of the permanent magnet to the magnet isolation hole distance is 1.53-1.72.

5. The permanent magnet rotor as claimed in claim 1, wherein the edge of the first slot portion at the end facing away from the second slot portion is provided with a chamfer, and the distance between the chamfers of any two adjacent second slot portions is 0.4 mm to 0.7 mm.

6. An electric motor, comprising:

a permanent magnet rotor according to any of claims 1-5;

7. The motor of claim 6, wherein the diameter of the mounting cavity is a stator inner diameter, the diameter corresponding to the outer edge of the stator is a stator outer diameter, and the ratio of the stator inner diameter to the stator outer diameter is 0.55-0.58.

8. The motor of claim 6, wherein the end face of the stator is provided with a winding slot, and the distance between the side wall of the winding slot facing away from the mounting cavity and the outer edge of the stator is the thickness of the yoke part; the distance between any two adjacent winding slots is the tooth width, and the ratio of the yoke thickness to the tooth width is 1.3-1.5.

9. The motor of claim 8, wherein said winding slot has an opening near one end of said mounting cavity, and said winding slot extends horizontally near a side wall near both ends of said opening.

10. The motor of claim 8, wherein the outer diameter of the stator is 38-41 mm;

the motor further comprises a winding, the winding is arranged in the winding slot and is a three-phase full-pitch winding, and the pitch of the winding is 3.