CN111725915A - Reluctance type hub motor - Google Patents
Reluctance type hub motor Download PDFInfo
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- CN111725915A CN111725915A CN202010470378.3A CN202010470378A CN111725915A CN 111725915 A CN111725915 A CN 111725915A CN 202010470378 A CN202010470378 A CN 202010470378A CN 111725915 A CN111725915 A CN 111725915A
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- rotor
- magnetic
- magnetic steel
- stator
- motor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2786—Outer rotors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
Abstract
The invention relates to a reluctance type hub motor, which comprises a rotor, a stator and a connecting shaft, wherein the stator and the connecting shaft are circumferentially positioned and fixed, the rotor is sleeved outside the stator, the rotor comprises a rim, a shell, a rotor iron core and permanent magnets, the shell and the rim are of an integral structure or fixedly connected, the rotor iron core is made of magnetic conductive materials and is arranged inside the shell and is positioned and fixed, the rotor iron core is provided with a plurality of magnetic steel grooves, the magnetic steel grooves are axial through grooves, the permanent magnets are arranged in the magnetic steel grooves in an embedded mode, the number of the magnetic steel grooves is even, every 2 magnetic steel grooves which form included angles and are distributed in a V shape form a magnetic steel groove group, 2 magnetic steel grooves in the magnetic steel groove group are symmetrical about the symmetry axis of a rotor rotating circle, the V-shaped distributed large openings of the magnetic steel groove group face the circle center, and. The invention has the beneficial effects that: the motor is suitable for weak magnetic speed-up driving, the low-speed and high-torque characteristics of the motor are guaranteed, high-speed and high-efficiency output can be realized, the high-efficiency interval is wide, and the endurance is long.
Description
Technical Field
The invention relates to the technical field of electric vehicles, in particular to a reluctance type hub motor.
Background
The motor for the electric vehicle in the prior art is of a hub type structure, the diameter of an outer rotor is generally larger due to the flat space of the hub type motor, compared with the traditional inner rotor motor, the hub type motor is generally provided with more magnetic poles which are arranged in a circumferential mode, and in consideration of the using condition of the motor and the limitation of a manufacturing technology and a control technology, a magnetic pole surface-mounted mode is adopted, the inductance ratio of a d axis to a q axis of the surface-mounted motor is 1 theoretically, namely the salient pole rate of the motor is 1, the motor is not suitable for a weak magnetic speed-up control scheme, so that the speed-adjusting space is not large, the high-efficiency interval of the motor is narrow, in addition, the surface-mounted hub type motor is poor in the sine type of air gap magnetic density distribution, and the output efficiency of a motor matching wave controller is low.
In order to solve the problems in the prior art, the technical staff in the field strives to develop a hub motor which is applicable to a weak magnetic speed-up control mode and can effectively reduce the number of pole pairs of the motor, and seeks to improve the salient pole ratio of the motor, widen the high-efficiency speed-adjusting interval of the motor, optimize the sine characteristic of air gap flux density distribution of the motor, and improve the efficiency and output torque of the motor.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a reluctance type hub motor which is provided with a built-in permanent magnet, is suitable for a weak magnetic speed-up control mode, has fewer pole pairs, has a salient pole rate of more than 1 and excellent sinusoidal characteristics, and has a wide high-efficiency speed-adjusting range, high working efficiency and large output torque. According to the reluctance type hub motor provided by the invention, the permanent magnets are arranged in the magnetic conductivity material, so that the number of pole pairs of the motor is greatly reduced, and the reluctance type hub motor is convenient to stably control. The motor has the advantages that because the permanent magnet is built in and the magnetic conductivity of the magnetic conductivity material is different from that of the magnetic steel and air, through reasonably designing the magnetic circuit of the motor, the salient pole ratio of the obtained motor is more than 1, the high-efficiency speed regulation range is wider, the high-efficiency high-speed output characteristic of the motor is ensured, and the working characteristics of low-speed small current input and large torque output of the motor are also kept.
In order to achieve the above object, the present invention provides a stator of an in-wheel motor for an electric vehicle, which has the following technical scheme:
the utility model provides a magnetic resistance formula in-wheel motor, includes rotor, stator and connecting axle, the stator with connecting axle circumference location is fixed, the rotor cover is established the stator outside, the rotor includes rim, casing, rotor core and permanent magnet, the casing with rim structure or fixed connection as an organic whole, its characterized in that: the rotor core is made of magnetic conductive materials and is arranged on the inner side of the shell and is fixed in a positioning mode, a plurality of magnetic steel grooves are formed in the rotor core and are axial through grooves, the permanent magnets are arranged in the magnetic steel grooves in an embedded mode, the number of the magnetic steel grooves is even, every 2 magnetic steel grooves which form included angles and are distributed in a V shape form a magnetic steel groove group, 2 magnetic steel grooves in the magnetic steel groove group are symmetrical about the symmetry axis of a rotor rotation circle, large openings of the V-shaped distribution of the magnetic steel groove group face the circle center, and the magnetic steel groove group is circumferentially and uniformly distributed. This design scheme's structure, the mode that the in-wheel motor permanent magnet table of having broken prior art pasted, with V type permanent magnet overall arrangement, the rational design magnetic circuit, the effectual number of pole pairs that has reduced the motor, motor drive control stability is better, less number of pole pairs, the iron loss of motor has been reduced, the efficiency of motor has been promoted, and the permanent magnet distribution of V type, the reluctance torque of motor has been constituted, be fit for the control demand of weak magnetism speed-raising, great widening the high-efficient speed governing region of motor, with torque and fast electric current reduction simultaneously, the continuation of the journey extension mileage.
The invention provides a reluctance type hub motor, which also comprises the following auxiliary technical scheme:
wherein, 2 magnet steel grooves of the magnet steel groove group are respectively independent and the middle is provided with a magnetic bridge, the magnetic bridge is made of rotor core body materials, and end face gaps are reserved at two ends of the permanent magnet. The magnetic bridge of this design sets up, the effectual d axle inductance that has improved the motor, has improved the weak magnetism speed-up efficiency of motor greatly, through the increase of very little d axle electric current promptly, the speed of promotion motor that can be obvious, and weak magnetism speed-up stability is good, and the high-efficient speed interval of motor is widened greatly. The end face gap structure is used for reducing the end magnetic leakage of the permanent magnet, reducing the local magnetic density saturation of the rotor core structure and improving the motor efficiency.
Permanent magnets are arranged in 2 magnetic steel grooves of the magnetic steel groove group, the permanent magnets are cuboids, and the sides, facing the circle center, of the permanent magnets distributed in a V shape in the same magnetic steel groove group are of the same magnetic polarity. The magnetic steel polarity setting mode of the design scheme forms the reluctance torque of the motor and is suitable for weak magnetic acceleration.
Wherein the magnetic polarities of the rotor are circumferentially spaced in "N" and "S" poles.
Wherein, the stator is equipped with 36 open slot matching rotor and is equipped with 16 pairs of magnetic poles, or the stator is equipped with 36 open slot matching rotor and is equipped with 20 pairs of magnetic poles, or the stator is equipped with 48 open slot matching rotor and is equipped with 22 pairs of magnetic poles, or the stator is equipped with 48 open slot matching rotor and is equipped with 26 pairs of magnetic poles, or the stator is equipped with 54 open slot matching rotor and is equipped with 30 pairs of magnetic poles, or the stator is equipped with 54 open slot matching rotor and is equipped with 24 pairs of magnetic poles. The design scheme expands the pole slot number selection scheme of the motor.
Wherein, the rotor core is of an integral structure or is formed by connecting a plurality of blocks end to end. The split end-to-end connection rotor core structure in the design scheme reduces the manufacturing cost of the rotor core and improves the production efficiency.
The outer diameter of the stator is 190-245 mm, the width of a tooth rib of the stator is 5.5-11 mm, the thickness of a yoke part of the stator is 3.5-8 mm, and the inner diameter of the stator is 155-175 mm. This design is applicable to most in-wheel motor's market demand, and more conductors can be placed to sufficient groove area, and the current overload capacity of motor promotes, has further improved the power density of motor.
Furthermore, the invention also provides an electric vehicle which comprises the reluctance type hub motor.
Compared with the prior art, the invention has the advantages and beneficial effects that:
according to the reluctance type hub motor provided by the invention, the rotor core is designed by using a magnetic conductive material, and the permanent magnet surface-mounted structure of the traditional hub motor is adjusted to be embedded, so that the number of pole pairs of the hub motor is properly reduced by the optimized scheme, the working frequency of the motor can be effectively reduced by reducing the number of pole pairs, the iron loss can be reduced, and the output efficiency of the motor is improved.
The invention provides a reluctance type hub motor, which designs permanent magnets into V-shaped distribution with the same polarity, a rotor of the scheme has reluctance torque, so that the control mode of weak magnetic acceleration of the motor is facilitated, a magnetic bridge is arranged in the middle of the V shape, the d-axis inductance is increased, the weak magnetic efficiency and the control quality and stability after the weak magnetic acceleration are improved, the reluctance torque exists, the reasonable magnetic circuit design is matched, the output efficiency of the motor is improved by 2-4 percentage points, the high speed of the motor is realized through weak magnetic, and the original speed of the motor is kept at low speed.
The reluctance type hub motor provided by the invention optimizes the pole slot combination, has large slot area, can be used for placing a conductor with larger sectional area, can bear increased current, and improves the power density of the motor.
Drawings
Fig. 1 is a schematic structural diagram of a reluctance hub motor according to the present invention.
Fig. 2 is an enlarged schematic view of a portion a in fig. 1.
Fig. 3 is a schematic structural diagram of a rotor core of the reluctance hub motor according to the present invention.
Fig. 4 is an enlarged schematic view of B in fig. 3.
In the figure, 1, rotor; 2. a stator; 11. a rim; 12. a housing; 13. a valve core hole; 14. a rotor core; 15. a permanent magnet; 21. a stator core; 22. a stator support; 141. a magnetic steel slot group; 142. a magnetic steel groove; 143. the rotor iron core is split; 144. an end face void; 145. a magnetic bridge.
Detailed Description
The following is a detailed description of the embodiments of the present invention, and the technical solutions of the present invention are further described in detail with reference to the accompanying drawings, and it should be noted that the described embodiments are only intended to facilitate the understanding of the present invention by those skilled in the art, and do not limit the scope of the present invention in any way.
Example 1:
as shown in fig. 1 to 4, the reluctance type hub motor for a 10-inch electric vehicle provided in this embodiment includes a rotor 1 and a stator 2, the rotor includes a rim 11, a housing 12, a rotor core 14 and a permanent magnet 15, a valve core hole 13 is formed in a portion of the rim 11, the rim 11 and the housing 12 in this embodiment are integrally die-cast, the motor selects 36 slots to match 16 pairs of poles, a magnetic steel slot group 141 is formed by every 2 magnetic steel slots 142 at a certain included angle, the magnetic steel slots 142 on the rotor core 14 are circumferentially and uniformly distributed by taking a V-shaped magnetic steel slot group 141 as a unit, an outer diameter of the rotor 1 in this embodiment is 220 to 230mm, and preferably, the outer diameter of the rotor 1 is 223 to 224 mm.
Particularly, the rotor core 14 in this embodiment is formed by connecting 8 rotor core split bodies 143 end to end, all the rotor core split bodies 143 have the same shape and structure, and are made of the same pair of dies, so that the processing technology is simple, the product consistency is good, and the manufacturing cost is low. The 2 magnetic steel slots 142 of the magnetic steel slot group 141 are independent and have magnetic bridges 145 in the middle, the magnetic bridges 145 are made of the material of the rotor core 14, and end gaps 144 are left at the two ends of the permanent magnet 15.
Further, 2 magnetic steel slots 142 of the magnetic steel slot group 141 of the rotor 1 of the present embodiment are independent of each other, and a magnetic bridge 145 is disposed in the middle of the magnetic steel slots, and the magnetic bridge 145 is made of the material of the rotor core 14. The structure is intended to improve d-axis inductance, is beneficial to weak magnetic acceleration control, and improves the efficiency of weak magnetic acceleration. After the rotor 1 is installed in the permanent magnet 15, redundant end face gaps 144 are left near two end parts of the permanent magnet 15, the structure optimizes a magnetic circuit, reduces end part magnetic leakage of the permanent magnet 15, and reduces local magnetic density saturation of the rotor iron core 14.
Further, the outer diameter of the stator 2 is 190-245 mm, and further preferably, the outer diameter of the stator 2 is 195-205 mm, and the outer diameter of the stator 2 in the embodiment is 210.2-210.5 mm; the width of the tooth rib of the stator 2 is 5.5-11 mm, preferably 6.5-8 mm, and the width of the tooth rib of the stator 2 is 7.0-8.0 mm; the thickness of the yoke part of the stator 2 is 3.5-8 mm, preferably, the thickness of the yoke part of the stator 2 is 3.5-5.5 mm, and the thickness of the yoke part of the stator 2 in the embodiment is 3.5-4.5 mm; the inner diameter of the stator 2 is 155 to 175mm, preferably, the inner diameter of the stator 2 is 155 to 160mm, and the inner diameter of the stator 2 is 157mm in this embodiment. This design is applicable to most in-wheel motor's market demand, and more conductors can be placed to sufficient groove area, and the current overload capacity of motor promotes, has further improved the power density of motor.
Example 2:
most of the technical solutions in this embodiment are the same as those in embodiment 1, and this embodiment only details different parts, and the parts of this embodiment that are the same as those in embodiment 1 are not described again.
The outer diameter of the rotor 1 in the embodiment is 265-275 mm, and preferably, the outer diameter of the rotor 1 is 265-270 mm; the outer diameter of the stator 2 is 190-245 mm, preferably 225-230 mm, and the outer diameter of the stator 2 in this embodiment is 227 mm; the width of the tooth rib of the stator 2 is 5.5-11 mm, preferably 8.5-9.5 mm, and the width of the tooth rib of the stator 2 is 9.0-9.5 mm; the thickness of the yoke part of the stator 2 is 3.5-8 mm, preferably, the thickness of the yoke part of the stator 2 is 5.5-7 mm, and the thickness of the yoke part of the stator 2 in the embodiment is 6.0-6.5 mm; the inner diameter of the stator 2 is 155-175 mm, preferably, the inner diameter of the stator 2 is 160-165 mm, and the inner diameter of the stator 2 is 163 mm.
The above embodiments are only preferred embodiments of the present invention, which are only used for illustrating the technical solutions of the present invention, and are not meant to limit the patent scope of the present invention, and all modifications or equivalent substitutions that are made to the technical solutions of the present invention by using the contents of the description and the drawings of the present invention, or directly or indirectly applied to other related technical fields, are included in the patent protection scope of the present invention.
Although the terms rotor 1, stator 2, rim 11, housing 12, valve core hole 13, rotor core 14, permanent magnet 15, stator core 21, stator support 22, magnetic steel slot group 141, magnetic steel slot 142, rotor core split 143, end face gap 144, magnetic bridge 145, etc. are used more herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.
Claims (8)
1. The utility model provides a magnetic resistance formula in-wheel motor, includes rotor, stator and connecting axle, the stator with connecting axle circumference location is fixed, the rotor cover is established the stator outside, the rotor includes rim, casing, rotor core and permanent magnet, the casing with rim structure or fixed connection as an organic whole, its characterized in that: the rotor core is made of magnetic conductive materials and is arranged on the inner side of the shell and is fixed in a positioning mode, a plurality of magnetic steel grooves are formed in the rotor core and are axial through grooves, the permanent magnets are arranged in the magnetic steel grooves in an embedded mode, the number of the magnetic steel grooves is even, every 2 magnetic steel grooves which form included angles and are distributed in a V shape form a magnetic steel groove group, 2 magnetic steel grooves in the magnetic steel groove group are symmetrical about the symmetry axis of a rotor rotation circle, large openings of the V-shaped distribution of the magnetic steel groove group face the circle center, and the magnetic steel groove group is circumferentially and uniformly distributed.
2. A reluctance hub motor according to claim 1, wherein: the 2 magnetic steel grooves of the magnetic steel groove group are independent respectively, a magnetic bridge is arranged in the middle of each magnetic steel groove, each magnetic bridge is made of a rotor iron core body material, and end face gaps are reserved at two ends of each permanent magnet.
3. A reluctance hub motor according to claim 1, wherein: the permanent magnets are arranged in 2 magnetic steel grooves of the magnetic steel groove group, the permanent magnets are cuboids, and the side faces, facing the circle center, of the permanent magnets distributed in a V shape in the same magnetic steel groove group are of the same magnetic polarity.
4. A reluctance hub motor according to claim 3, wherein: the magnetic polarities of the rotor are circumferentially spaced in "N" and "S" poles.
5. A reluctance hub motor according to claim 3, wherein: the stator is equipped with 36 open slot matches the rotor is equipped with 16 pairs of magnetic poles, or the stator is equipped with 36 open slot matches the rotor is equipped with 20 pairs of magnetic poles, or the stator is equipped with 48 open slot matches the rotor is equipped with 22 pairs of magnetic poles, or the stator is equipped with 48 open slot matches the rotor is equipped with 26 pairs of magnetic poles, or the stator is equipped with 54 open slot matches the rotor is equipped with 30 pairs of magnetic poles, or the stator is equipped with 54 open slot matches the rotor is equipped with 24 pairs of magnetic poles.
6. A reluctance hub motor according to claim 1, wherein: the rotor iron core is of an integral structure or is formed by connecting a plurality of blocks end to end.
7. A reluctance hub motor according to claim 1, wherein: the outer diameter of the stator is 190-245 mm, the width of the tooth rib of the stator is 5.5-11 mm, the thickness of the yoke of the stator is 3.5-8 mm, and the inner diameter of the stator is 155-175 mm.
8. An electric vehicle, characterized in that: comprising a reluctance hub motor according to any one of claims 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010470378.3A CN111725915A (en) | 2020-05-28 | 2020-05-28 | Reluctance type hub motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010470378.3A CN111725915A (en) | 2020-05-28 | 2020-05-28 | Reluctance type hub motor |
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| Publication Number | Publication Date |
|---|---|
| CN111725915A true CN111725915A (en) | 2020-09-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010470378.3A Pending CN111725915A (en) | 2020-05-28 | 2020-05-28 | Reluctance type hub motor |
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| CN (1) | CN111725915A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112953152A (en) * | 2021-03-23 | 2021-06-11 | 台铃科技(江苏)股份有限公司 | High salient pole ratio permanent magnet motor for electric motor |
-
2020
- 2020-05-28 CN CN202010470378.3A patent/CN111725915A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112953152A (en) * | 2021-03-23 | 2021-06-11 | 台铃科技(江苏)股份有限公司 | High salient pole ratio permanent magnet motor for electric motor |
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