CN214799088U - Rotor magnetic steel structure of driving motor of electric two-wheel vehicle - Google Patents
Rotor magnetic steel structure of driving motor of electric two-wheel vehicle Download PDFInfo
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- CN214799088U CN214799088U CN202120687780.7U CN202120687780U CN214799088U CN 214799088 U CN214799088 U CN 214799088U CN 202120687780 U CN202120687780 U CN 202120687780U CN 214799088 U CN214799088 U CN 214799088U
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- driving motor
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 76
- 239000010959 steel Substances 0.000 title claims abstract description 76
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 29
- 238000004512 die casting Methods 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 abstract description 4
- 230000010349 pulsation Effects 0.000 abstract description 4
- 230000002401 inhibitory effect Effects 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
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- Iron Core Of Rotating Electric Machines (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The utility model discloses a rotor magnetic steel structure of a driving motor of an electric two-wheel vehicle, which comprises a magnetic steel body, wherein the outer wall surface of the magnetic steel body is a cambered surface which is attached to the inner wall of an iron ring of a motor rotor and the curvature of the circle where the two are positioned is consistent; the inner wall surface of the magnetic steel body is a plane, and an uneven air gap for reducing motor harmonic waves is formed between the inner wall surface and the motor stator iron core. Above-mentioned electric bicycle driving motor's rotor magnet steel structure has designed one side and has been the cambered surface, the another side is planar shape, reduces the clearance of magnet steel and rotor iron ring, improves the magnet steel utilization ratio to become inhomogeneous air gap with stator core's air gap, can reduce the harmonic of motor, all can play the inhibitory action to torque pulsation, vibration noise, and can reduce motor cost, reduce the motor iron loss, promote motor efficiency.
Description
Technical Field
The utility model relates to a motor field for electric two-wheeled vehicle especially relates to an electric two-wheeled vehicle driving motor's rotor magnet steel structure.
Background
The motor of the electric two-wheeled vehicle is an outer rotor type hub motor, belongs to a low-speed direct drive motor, is different from a conventional high-speed motor, and is lower in efficiency and larger in energy consumption.
Among the prior art, magnet steel 1 'of outer rotor motor among the electronic two wheeler is the rectangle usually, directly paste at rotor iron ring 2' inboard, as shown in fig. 3, in order to reduce the distance between magnet steel 1 'rectangle straight line limit and the inboard circular arc of rotor iron ring 2', the width of magnet steel 1 'can not be too big, so lead to the number of poles of rotor very many, the number of poles is too many to be unfavorable for the motor efficiency optimization, interval 3' between magnet steel and the rotor iron ring leads to the magnet steel utilization ratio to reduce simultaneously.
In addition, the magnetic steel 1 "is also arranged to be arc-shaped matched with the rotor iron ring 2", as shown in fig. 4, although the utilization rate of the magnetic steel can be improved by the double-sided arc-shaped magnetic steel 1 ", the processing is troublesome, and meanwhile, the motor air gap is changed into a uniform circular air gap 3", which is not beneficial to reducing harmonic waves.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an electric two wheeler driving motor's rotor magnet steel structure, to above-mentioned problem, optimize current magnet steel shape, solve and have the magnet steel utilization ratio among the current structure low, the motor number of poles is many, the cost is on the high side, the motor magnetic field harmonic is high, influence motor performance scheduling problem.
In order to achieve the purpose, the utility model adopts the following technical proposal:
a rotor magnetic steel structure of a driving motor of an electric two-wheeled vehicle comprises a magnetic steel body, wherein the outer wall surface of the magnetic steel body is an arc surface, the arc surface is attached to the inner wall of an iron ring of a rotor of the motor, and the curvatures of circles where the arc surface and the arc surface are located are consistent; the inner wall surface of the magnetic steel body is a plane, and an uneven air gap for reducing motor harmonic waves is formed between the inner wall surface and the motor stator iron core.
Particularly, the magnetic steel body is formed by die casting, the outer wall surface of the magnetic steel body is ground by a grinding wheel and is directly bonded with the inner wall of the rotor iron ring.
In particular, the ratio of the number of poles of the motor to the number of slots of the stator is 40:48 or 44: 48.
Particularly, the plurality of magnetic steel bodies are arranged in a staggered mode at equal intervals.
To sum up, the beneficial effects of the utility model are that, compared with the prior art, electric two wheeler driving motor's rotor magnet steel structure has following advantage:
1) the motor magnetic steel is designed into a shape with one arc surface and the other plane, so that the gap between the magnetic steel and the rotor iron ring is reduced, the utilization rate of the magnetic steel is improved, the air gap between the magnetic steel and the stator iron core is changed into an uneven air gap, the harmonic wave of the motor can be reduced, and the suppression effect on torque pulsation and vibration noise can be realized;
2) only one side of the cambered surface of the magnetic steel needs to be ground by a grinding wheel, so that compared with the traditional tile-shaped magnetic steel (grinding wheel with two cambered surfaces), the processing cost of the magnetic steel can be obviously reduced, and the cost of the motor is reduced;
3) this shape magnet steel can reduce the number of poles of motor, reduces the magnet steel quantity, reduces the number of poles after, can adopt suitable motor groove cooperation to reduce the motor iron loss, promote motor efficiency.
Drawings
Fig. 1 is an assembly schematic view of a rotor magnetic steel structure of a driving motor of an electric two-wheeled vehicle provided by an embodiment of the invention;
FIG. 2 is an enlarged view at A in FIG. 1;
FIG. 3 is a schematic structural diagram of a rotor magnetic steel of a driving motor of an existing electric two-wheeled vehicle;
fig. 4 is a schematic structural diagram of rotor magnetic steel of another conventional electric two-wheeled vehicle driving motor.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
Please refer to fig. 1 and 2, the present embodiment provides a rotor magnetic steel structure of a driving motor of an electric two-wheeled vehicle, which includes a magnetic steel body 1, an outer wall surface of the magnetic steel body 1 is an arc surface 11, which is attached to an inner wall of a rotor iron ring 2 of the motor and has a uniform curvature of a circle where the two are located, an inner wall surface of the magnetic steel body 1 is a plane 12, which forms an uneven air gap between the magnetic steel body and a stator iron core 3 of the motor for reducing motor harmonics.
The arc surface 11 is designed to reduce the gap between the magnetic steel body 1 and the motor rotor iron ring 2 and improve the utilization rate of the magnetic steel; the plane 12 design changes the air gap of the motor into an uneven air gap, can reduce the harmonic wave of the motor, and can play a role in inhibiting torque pulsation and vibration noise.
The magnetic steel body 1 is formed by die casting, only the outer wall surface of the magnetic steel body is ground by a grinding wheel and directly bonded with the inner wall of the rotor iron ring, so that the double-side processing cost can be reduced, and the use requirement is met.
A plurality of magnet steel bodies 1 also can be arranged at equal intervals in a staggered manner, so that the pulse vibration of the motor is reduced.
Therefore, the magnetic steel with one cambered surface and the other plane can reduce the number of poles of the motor, the ratio of the number of poles of the motor to the number of slots of the stator is set to be 40:48 or 44:48 (the unit motor is 12-slot 10-pole or 24-slot 22-pole) while ensuring the output and the efficiency of the motor, and compared with the commonly used 48-pole and 52-pole magnetic steel, the number of poles can be reduced to 40 poles or even lower, so that the iron loss of the motor is reduced, the efficiency of the motor is improved, the utilization rate of the magnetic steel is greatly improved, and the using amount of the magnetic steel is reduced by more than 30%.
In conclusion, the rotor magnetic steel structure of the electric two-wheeled vehicle driving motor is designed into a shape with one surface being an arc surface and the other surface being a plane, so that the gap between the magnetic steel and the rotor iron ring is reduced, the utilization rate of the magnetic steel is improved, the air gap between the magnetic steel and the stator iron core is changed into an uneven air gap, the harmonic wave of the motor can be reduced, and the suppression effect on torque pulsation and vibration noise can be realized; only one side of the cambered surface of the magnetic steel needs to be ground by a grinding wheel, so that the machining cost of the magnetic steel can be obviously reduced compared with the traditional tile-shaped magnetic steel (grinding wheel with two cambered surfaces), and the cost of the motor is reduced; in addition, this shape magnet steel can reduce the number of poles of motor, reduces the magnet steel quantity, reduces the number of poles after, can adopt suitable motor groove cooperation to reduce motor iron loss, promote motor efficiency.
The above embodiments have been merely illustrative of the basic principles and features of the present invention, and the present invention is not limited by the above embodiments, and does not depart from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. A rotor magnetic steel structure of a driving motor of an electric two-wheeled vehicle is characterized by comprising a magnetic steel body, wherein the outer wall surface of the magnetic steel body is an arc surface, the arc surface is attached to the inner wall of an iron ring of a rotor of the motor, and the curvatures of circles where the arc surface and the arc surface are located are consistent; the inner wall surface of the magnetic steel body is a plane, and an uneven air gap for reducing motor harmonic waves is formed between the inner wall surface of the magnetic steel body and a motor stator iron core.
2. The rotor magnetic steel structure of the electric two-wheeled vehicle driving motor according to claim 1, characterized in that: the magnetic steel body is formed by die casting, the outer wall surface of the magnetic steel body is ground and processed by a grinding wheel, and the magnetic steel body is directly bonded with the inner wall of the rotor iron ring.
3. The rotor magnetic steel structure of the electric two-wheeled vehicle driving motor according to claim 1, characterized in that: the ratio of the number of poles of the motor to the number of slots of the stator is 40:48 or 44: 48.
4. The rotor magnetic steel structure of the electric two-wheeled vehicle driving motor according to claim 1, characterized in that: a plurality of the magnetic steel bodies are arranged in a staggered mode at equal intervals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120687780.7U CN214799088U (en) | 2021-04-02 | 2021-04-02 | Rotor magnetic steel structure of driving motor of electric two-wheel vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120687780.7U CN214799088U (en) | 2021-04-02 | 2021-04-02 | Rotor magnetic steel structure of driving motor of electric two-wheel vehicle |
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| CN214799088U true CN214799088U (en) | 2021-11-19 |
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| CN202120687780.7U Active CN214799088U (en) | 2021-04-02 | 2021-04-02 | Rotor magnetic steel structure of driving motor of electric two-wheel vehicle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112910137A (en) * | 2021-04-02 | 2021-06-04 | 江苏爱玛车业科技有限公司 | Rotor magnetic steel structure of driving motor of electric two-wheel vehicle |
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2021
- 2021-04-02 CN CN202120687780.7U patent/CN214799088U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112910137A (en) * | 2021-04-02 | 2021-06-04 | 江苏爱玛车业科技有限公司 | Rotor magnetic steel structure of driving motor of electric two-wheel vehicle |
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