CN204205765U - Rotor and there is its motor - Google Patents
Rotor and there is its motor Download PDFInfo
- Publication number
- CN204205765U CN204205765U CN201420724561.1U CN201420724561U CN204205765U CN 204205765 U CN204205765 U CN 204205765U CN 201420724561 U CN201420724561 U CN 201420724561U CN 204205765 U CN204205765 U CN 204205765U
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- magnet steel
- magnet
- groove
- rotor
- permanent
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Abstract
The utility model provides a kind of rotor and has its motor.Rotor comprises rotor core, and rotor core is provided with field structure, and field structure comprises: multilayer magnet steel groove, and the two ends of each layer magnet steel groove are provided with every magnetic bridge; Permanent-magnet structure, permanent-magnet structure is arranged in each layer magnet steel groove correspondingly, at least one permanent-magnet structure comprises multiple magnet steel, multiple magnet steel is divided into middle magnet steel and even number side magnet steel, the center line of middle magnet steel overlaps with pole center line, side magnet steel is symmetricly set on the both sides of middle magnet steel, is provided with magnetic conduction bridge between adjacent two magnet steel, and the center line of each layer magnetic conduction bridge is not on the same line.Motor noise can be reduced by this rotor.
Description
Technical field
The utility model relates to motor apparatus field, in particular to a kind of rotor and the motor with it.
Background technology
Permanent-magnet synchronous reluctance motor has the advantage of high-efficiency and low-cost, in practice process, has magnet steel groove in usual rotor, and is embedded in magnet steel groove by permanent magnet, thus make full use of reluctance torque.The Driving Torque of motor is synthesized by permanent-magnet torque and reluctance torque, and due to the design feature of motor own, the fluctuation of DQ axle inductance difference is comparatively large, causes reluctance torque fluctuation wherein comparatively large, makes motor produce larger vibration.By magnet steel size and position in conversion rotor, torque pulsation can not be effectively reduced under many circumstances or reduce motor performance.
Utility model content
Main purpose of the present utility model is the motor providing a kind of rotor and have it, causes greatly with the torque pulsation solving motor of the prior art the problem that noise is large.
To achieve these goals, according to an aspect of the present utility model, a kind of rotor is provided, rotor comprises rotor core, rotor core is provided with field structure, and field structure comprises: multilayer magnet steel groove, and the two ends of each layer magnet steel groove are provided with every magnetic bridge; Multiple permanent-magnet structure, each permanent-magnet structure is arranged in each layer magnet steel groove correspondingly, at least one permanent-magnet structure comprises multiple magnet steel, multiple magnet steel is divided into middle magnet steel and even number side magnet steel, the center line of middle magnet steel overlaps with pole center line, side magnet steel is symmetricly set on the both sides of middle magnet steel, is provided with magnetic conduction bridge between adjacent two magnet steel, and the center line of each layer magnetic conduction bridge is not on the same line.
Further, the width of middle magnet steel is greater than the width of each side magnet steel, and along the direction away from middle magnet steel, the width of each side magnet steel reduces successively.
Further, rotor core comprises multiple along the equally distributed field structure of rotor core circumference, and each field structure is at least made up of inner layer groove and outer groove, and outer slot is in the side of the axis hole away from rotor core of inner layer groove.
Further, inner layer groove is deep-slotted chip breaker, is provided with five magnet steel in inner layer groove, and five magnet steel form permanent-magnet structure, and outer groove is deep-slotted chip breaker, is provided with a magnet steel in outer groove.
Further, in inner layer groove, be provided with three yi word pattern magnet steel, three arc magnet steel are set in outer groove.
Further, be provided with permanent-magnet structure in inner layer groove, and permanent-magnet structure comprises middle magnet steel and four side magnet steel, the width of permanent-magnet structure is greater than 5:2:1 than for L21:L22:L23.
Further, outer groove is provided with permanent-magnet structure, and permanent-magnet structure comprises middle magnet steel and two side magnet steel, and the width of permanent-magnet structure is greater than 1.5:1 than for L11:L12 and is less than 2:1.
Further, have distance δ between adjacent two magnet steel, the span of distance δ is 2Wt >=δ >=Wt, and wherein Wt is the distance between the end every magnetic bridge of the magnet steel groove at magnet steel place and the outer of rotor core.
Further, have angle theta, angle theta <360/p between the center line of adjacent two magnetic conduction bridges of adjacent two layers magnet steel groove, wherein p is number of poles.
According to another aspect of the present utility model, provide a kind of motor, comprise rotor, rotor is above-mentioned rotor.Application the technical solution of the utility model, rotor comprises rotor core, and rotor core is provided with field structure, and field structure comprises multilayer magnet steel groove and permanent-magnet structure, and the two ends of each layer magnet steel groove are provided with every magnetic bridge; Permanent-magnet structure is arranged in each layer magnet steel groove correspondingly, permanent-magnet structure in magnet steel groove comprises multiple magnet steel, multiple magnet steel is divided into middle magnet steel and even number side magnet steel, the center line of middle magnet steel overlaps with pole center line, side magnet steel is symmetricly set on the both sides of middle magnet steel, be provided with magnetic conduction bridge between adjacent two magnet steel, the center line of each magnetic conduction bridge of each layer magnet steel groove is not on the same line.Permanent-magnet structure is embedded in magnet steel groove and firmly can fixes permanent-magnet structure, by the permanent-magnet structure of one of the prior art is divided into multiple magnet steel, and magnetic conduction bridge is set between magnet steel, make the q axle magnetic line of force of motor at the inner relative distribution of rotor, magnetic line of force distribution is more even.Certain dislocation is there is between the center line that the center line of each magnetic conduction bridge of each layer magnet steel groove can not ensure magnetic conduction bridge on the same line, when rotor is applied to after in motor, motor stator after powered up, the magnetic line of force by rotor from N pole to S pole time, flux-obstruction can be increased to interlayer.Realize reducing motor torque ripple and harmonic content, and then reduce the object of motor noise.
Accompanying drawing explanation
The Figure of description forming a application's part is used to provide further understanding of the present utility model, and schematic description and description of the present utility model, for explaining the utility model, is not formed improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 shows the sectional structure schematic diagram of the rotor according to embodiment of the present utility model;
Fig. 2 shows the partial enlarged drawing of the rotor in Fig. 1;
Fig. 3 shows the sectional structure schematic diagram of the rotor according to another embodiment of the present utility model;
Fig. 4 shows the sectional structure schematic diagram of the rotor according to another embodiment of the present utility model;
Fig. 5 shows the sectional structure schematic diagram of the motor stator according to embodiment of the present utility model; And
Fig. 6 shows the partial enlarged drawing of the cutaway view of the rotor according to another embodiment of the present utility model.
Wherein, above-mentioned accompanying drawing comprises the following drawings mark:
10, rotor core; 11, inner layer groove; 12, outer groove; 111, every magnetic bridge; L11, L21, middle magnet steel; L12, L22, L23, side magnet steel; 24, magnetic conduction bridge; 30, motor stator.
Embodiment
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the utility model in detail in conjunction with the embodiments.
As shown in Figures 1 to 6, according to embodiment of the present utility model, rotor comprises rotor core 10, and rotor core 10 is provided with field structure, and field structure comprises multilayer magnet steel groove and multiple permanent-magnet structure, and the two ends of each layer magnet steel groove are provided with every magnetic bridge 111; Each permanent-magnet structure is arranged in each layer magnet steel groove correspondingly, permanent-magnet structure in magnet steel groove comprises multiple magnet steel, multiple magnet steel is divided into middle magnet steel L11, L21 and even number side magnet steel L12, L22, L23, the center line of middle magnet steel L11, L21 overlaps with pole center line, side magnet steel L12, L22, L23 are symmetricly set on the both sides of middle magnet steel L11, L21, be provided with magnetic conduction bridge 24 between adjacent two magnet steel, the center line of each magnetic conduction bridge 24 of each layer magnet steel groove is not on the same line.
Permanent-magnet structure is embedded in magnet steel groove and firmly can fixes permanent-magnet structure, by the permanent-magnet structure of one of the prior art is divided into multiple magnet steel, and magnetic conduction bridge 24 is set between magnet steel, make the q axle magnetic line of force of motor at the inner relative distribution of rotor, magnetic line of force distribution is more even.Certain dislocation is there is between the center line that the center line of each magnetic conduction bridge 24 of each layer magnet steel groove can not ensure magnetic conduction bridge 24 on the same line, when rotor is applied to after in motor, motor stator after powered up, the magnetic line of force by rotor from N pole to S pole time, flux-obstruction can be increased to interlayer.Realize reducing motor torque ripple and harmonic content, and then reduce the object of motor noise.
In the present embodiment, the width of middle magnet steel L11, L21 is greater than the width of each side magnet steel L12, L22, L23, along the direction away from middle magnet steel L11, L21, the width of each side magnet steel L12, L22, L23 reduces and segmentation place trend magnetic pole two ends successively, makes the inductance of the d axle of motor can not significant change, and reluctance torque can not reduce, the distribution of air gap flux density is more sinusoidal simultaneously, decrease harmonic content, thus decrease motor torque ripple and harmonic content, and then reduce motor noise.
In the present embodiment, rotor core 10 comprises that multiple each field structure is at least made up of inner layer groove 11 and outer groove 12 along the circumferential equally distributed field structure of rotor core 10, and outer groove 12 is positioned at the side of the axis hole away from rotor core 10 of inner layer groove 11.The number of plies of the magnet steel groove of rotor core 10 can be selected according to demand, and the number of the field structure on rotor core 10 also can be selected according to demand.
In the present embodiment, at least one deck in magnet steel groove is provided with permanent-magnet structure, at least arranges this permanent-magnet structure in one deck magnet steel groove and takes segmental structure to reduce motor oscillating.
In the present embodiment, be provided with permanent-magnet structure in inner layer groove 11, and permanent-magnet structure comprises middle magnet steel L21 and four side magnet steel L22, L23, the width of permanent-magnet structure is greater than 5:2:1 than for L21:L22:L23.Wherein the width of permanent-magnet structure refers to the width of the radial direction along rotor core 10 in Fig. 1.Wherein, L21:L22 is greater than 5:2, and L22:L23 is greater than 2:1.
Preferably, outer groove 12 is provided with permanent-magnet structure, and permanent-magnet structure comprises middle magnet steel L11 and 2 side magnet steel L12, and the width of permanent-magnet structure is greater than 1.5:1 than for L11:L12 and is less than 2:1.
Adopt the permanent-magnet structure of this kind of configuration, on the one hand, due to the existence of magnetic conduction bridge 24, make the q axle magnetic line of force of motor at the inner relative distribution of rotor, the magnetic line of force is more evenly distributed, on the other hand, because like this design segmentation place all tends to magnetic pole two ends, thus make motor d axle inductance can not significant change, reluctance torque can not reduce, and allocation ratio like this, more identical with the Sine distribution trend of air gap flux density, harmonic reduction content such as 3,5 subharmonic.
Preferably, between the center line of arbitrary neighborhood two magnetic conduction bridges of each layer magnet steel groove, there is angle, between the center line of adjacent two magnetic conduction bridges of adjacent two layers magnet steel groove, there is angle theta, in the present embodiment, middle magnet steel L21 and the center line of magnetic conduction bridge between the side magnet steel L22 of middle magnet steel L21 side and between the center line of the magnetic conduction bridge between middle magnet steel L11 and side magnet steel L22, there is angle theta, the span of this angle theta is that θ is less than 360/p, wherein, p is the rotor number of poles of rotor, and θ ≠ 0 °.
Preferably, in order to prevent leakage field serious, have distance δ between adjacent two magnet steel, the span of distance δ is 2Wt >=δ >=Wt, and wherein Wt is the distance between the end every magnetic bridge 111 of the magnet steel groove at magnet steel place and the outer of rotor core 10.
It should be noted that, magnet steel can be a type magnet steel or tile-type magnet steel.
According to another aspect of the present utility model, provide a kind of motor, comprise rotor, rotor is above-mentioned rotor.Adopt above-mentioned rotor effectively can reduce noise.
In the present embodiment, motor also comprises motor stator 30, and rotor is arranged in motor stator 30 and also can rotates relative to motor stator 30.
Wherein, motor stator 30 comprises stator core, and the circumference of stator core is evenly distributed with multiple winding slot.
Adopt the motor of this kind of rotor in the permanent torque operation phase, motor performance can be ensured, and the permanent torque range of operation of motor is increased, by reasonable disposition magnet steel width, make motor gas-gap magnetic close closer to Sine distribution, harmonic content reduces, thus torque pulsation is reduced, and motor permanent magnet not easily loss of excitation.
Owing to have employed magnet steel segmentation, reduce in former similar conventional motor that magnetic pole two ends are every the stress at magnetic bridge place and the distortion every magnetic bridge centre position, maximum stress point is distributed on multiple reinforcement, rotor height rotating speed is run safer.
Rotor by magnet steel reasonable disposition, permanent magnet consumption without the need to increase, torque pulsation reduce, iron loss reduce, electric efficiency improve.Because magnet steel is segmentation, the magnetic conduction bridge between segmentation magnet steel provides leakage field magnetic circuit, and therefore, motor stator armature winding armature back-emf weakens the demagnetizing effect of magnet steel.
This rotor can be applied to permanent magnet reluctance motor.
Magnet steel used in rotor can be " one " type or watt shape, the magnet steel groove of each pole of the formation in rotor is uniformly distributed along the circumference of rotor core 10, permanent-magnet structure is arranged in magnet steel groove correspondingly, each magnet steel groove two ends all have certain for magnetic bridge 111, are connected between each section of magnet steel by magnetic conduction bridge 24.The magnet steel groove of every pole can have multilayer, be provided with polylith magnet steel, and every layer of magnet steel is divided into odd number block in each layer magnet steel groove, as 3 sections, 5 sections, 7 sections etc., is provided with magnetic conduction bridge 24 and designs every magnetic between each segmentation magnet steel.Wherein, middle magnet steel L11, L21 are wider, and its center line overlaps with pole center line.Magnet steel number in every layer of magnet steel groove is the reason of odd number is that during even number section, the center line of magnetic conduction bridge overlaps with pole center line, and electromagnetism is exerted oneself reduction.
Even number section side magnet steel L12, L22, L23 of middle magnet steel L11, L21 both sides distribute in middle magnet steel L11, L21 bilateral symmetry, and its width successively decreases successively according to air-gap field.
In the present embodiment, magnet steel groove is made up of inner layer groove 11 and outer groove 12, and the magnet steel be wherein arranged in outer groove 12 is three sections, middle magnet steel L11 and two side magnet steel L12.Its width allocation proportion is 1.5:1<L11:L12<2:1.
The magnet steel be arranged in inner layer groove 11 is 5 sections, middle magnet steel L21, two side magnet steel L22 and two side magnet steel L23.Its width allocation proportion is L21:L22:L23>5:2:1.Above-mentioned width refers to the distance of the center to center of magnet steel both ends of the surface.Such as, magnet steel is arc magnet steel, and its width refers to the chord length of the center arc of magnet steel.
The center line of the magnetic conduction bridge 24 of each layer does not allow on the same line, requires certain dislocation, makes motor stator after galvanization, the magnetic line of force by rotor from N pole to S pole time, flux-obstruction can be increased to interlayer.As shown in Figure 2, the angle theta of magnetic conduction bridge center line between levels, this angle θ <360/p (p is number of poles).
Wherein, for avoiding leakage field between magnet steel serious, the distance δ embedded between the segmentation magnet steel in magnet steel groove should meet 2Wt >=δ >=Wt (Wt is the distance every magnetic bridge end to rotor diameter).
Wherein, for the rotor of multilayer magnetic pole structure, can select wherein that one or more layers is for partitioned organization, its width distributes to be modulated according to air-gap field.
Due to when same Driving Torque, permanent magnet motor stator winding current reduces, and the armature field of generation is little, and the field weakening produced permanent magnet is little, and change not quite before the magnetic resistance of rotor and non-piecemeal, permanent magnet leakage field is less.
When high frequency runs, stator winding current is larger, armature reaction is large, the armature field produced permanent magnet is very large, and due to magnet steel piecemeal, between each segmentation magnet steel, magnetic conduction bridge 24 provides leakage field magnetic circuit, permanent magnet leakage field is increased, the back-emf of motor can reduce than in not segmentation situation, thus motor speed can be improved further, because the weak magnetic being beneficial to permanent magnet reluctance motor that is provided with of segmentation magnet steel raises speed.And the leakage magnetic circuit that magnetic conduction bridge provides, make the permanent magnet not easily loss of excitation in permanent magnetism.
From above description, can find out, the utility model the above embodiments achieve following technique effect: by by magnet steel piecemeal, change the way that tradition adopts monoblock magnet steel, and make requirement to its block count and distribution method, according to the above-mentioned magnet steel width configuration ratio mentioned, select rational magnet steel width, the harmonic content of motor is reduced, and the magnetic line of force is more evenly distributed, reach the object reducing motor torque ripple and harmonic content, thus reduce noise of motor.
Corresponding requirements has been done to the magnetic conduction bridge of magnet steel interlayer, thus the magnetic line of force by rotor from N pole to S pole time, flux-obstruction can be increased to interlayer, on the one hand increase d direction of principal axis magnetic resistance, in turn enhance the anti-demagnetization capability of magnet steel under armature reaction.This makes the torque pulsation of permanent-magnet synchronous reluctance motor reduce, and makes motor electromagnetic noise reduction; Solve the problem of motor high frequency weak-magnetic speed-regulating difficulty; Solve the problem that permanent magnet easily demagnetizes.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.
Claims (10)
1. a rotor, described rotor comprises rotor core (10), and (10) are provided with field structure to described rotor core, it is characterized in that, described field structure comprises:
Multilayer magnet steel groove, the two ends of the described magnet steel groove of each layer are provided with every magnetic bridge (111);
Multiple permanent-magnet structure, each described permanent-magnet structure is arranged in the described magnet steel groove of each layer correspondingly, permanent-magnet structure described at least one comprises multiple magnet steel, described multiple magnet steel is divided into middle magnet steel (L11, and even number side magnet steel (L12 L21), L22, L23), described middle magnet steel (L11, L21) center line overlaps with pole center line, described side magnet steel (L12, L22, L23) described middle magnet steel (L11 is symmetricly set on, L21) both sides, magnetic conduction bridge (24) is provided with between adjacent two magnet steel, the center line of the described magnetic conduction bridge (24) of each layer is not on the same line.
2. rotor according to claim 1, it is characterized in that, the width of described middle magnet steel (L11, L21) is greater than the width of each described side magnet steel (L12, L22, L23), along the direction away from described middle magnet steel (L11, L21), the width of each described side magnet steel (L12, L22, L23) reduces successively.
3. rotor according to claim 2, it is characterized in that, described rotor core (10) comprises multiple along the equally distributed described field structure of described rotor core (10) circumference, each described field structure is at least made up of inner layer groove (11) and outer groove (12), and described outer groove (12) is positioned at the side of the axis hole away from described rotor core (10) of described inner layer groove (11).
4. rotor according to claim 3, it is characterized in that, described inner layer groove (11) is deep-slotted chip breaker, five magnet steel are provided with in described inner layer groove (11), described five magnet steel form described permanent-magnet structure, described outer groove (12) is deep-slotted chip breaker, is provided with a magnet steel in described outer groove (12).
5. rotor according to claim 3, is characterized in that, is provided with three yi word pattern magnet steel in described inner layer groove (11), arranges three arc magnet steel in described outer groove (12).
6. rotor according to claim 3, it is characterized in that, described inner layer groove is provided with described permanent-magnet structure in (11), and described permanent-magnet structure comprises middle magnet steel (L11, L21) and four described sides magnet steel (L12, L22, L23), the width of described permanent-magnet structure is greater than 5:2:1 than for L21:L22:L23.
7. rotor according to claim 3, it is characterized in that, described outer groove (12) is provided with described permanent-magnet structure, and described permanent-magnet structure comprises middle magnet steel (L11, L21) and two described sides magnet steel (L12, L22, L23), the width of described permanent-magnet structure is greater than 1.5:1 than for L11:L12 and is less than 2:1.
8. rotor according to claim 1, it is characterized in that, between adjacent two magnet steel, there is distance δ, the span of distance δ is 2Wt >=δ >=Wt, and wherein Wt is the distance between the end every magnetic bridge (111) of the magnet steel groove at described magnet steel place and the outer of described rotor core (10).
9. rotor according to claim 1, is characterized in that, have angle theta, described angle theta <360/p between the center line of adjacent two magnetic conduction bridges of magnet steel groove described in adjacent two layers, wherein p is number of poles.
10. a motor, comprises rotor, it is characterized in that, the rotor of described rotor according to any one of claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420724561.1U CN204205765U (en) | 2014-11-25 | 2014-11-25 | Rotor and there is its motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420724561.1U CN204205765U (en) | 2014-11-25 | 2014-11-25 | Rotor and there is its motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204205765U true CN204205765U (en) | 2015-03-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420724561.1U Withdrawn - After Issue CN204205765U (en) | 2014-11-25 | 2014-11-25 | Rotor and there is its motor |
Country Status (1)
| Country | Link |
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| CN (1) | CN204205765U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104600890A (en) * | 2014-11-25 | 2015-05-06 | 珠海格力节能环保制冷技术研究中心有限公司 | Motor rotor and electric motor having it |
| CN104868624A (en) * | 2015-03-30 | 2015-08-26 | 沈阳化工大学 | High-speed permanent-magnet motor rotor with layered permanent magnet structure |
| CN106410999A (en) * | 2016-10-26 | 2017-02-15 | 珠海格力节能环保制冷技术研究中心有限公司 | Motor rotor and motor having motor rotor and compressor |
| CN112436625A (en) * | 2019-08-26 | 2021-03-02 | 安徽美芝精密制造有限公司 | Rotor, motor, compressor and refrigeration plant |
| EP3745560A4 (en) * | 2018-03-16 | 2021-04-14 | Gree Electric Appliances, Inc. of Zhuhai | Rotor structure, permanent magnet auxiliary synchronous reluctance motor and electric vehicle |
-
2014
- 2014-11-25 CN CN201420724561.1U patent/CN204205765U/en not_active Withdrawn - After Issue
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104600890A (en) * | 2014-11-25 | 2015-05-06 | 珠海格力节能环保制冷技术研究中心有限公司 | Motor rotor and electric motor having it |
| CN104868624A (en) * | 2015-03-30 | 2015-08-26 | 沈阳化工大学 | High-speed permanent-magnet motor rotor with layered permanent magnet structure |
| CN106410999A (en) * | 2016-10-26 | 2017-02-15 | 珠海格力节能环保制冷技术研究中心有限公司 | Motor rotor and motor having motor rotor and compressor |
| CN106410999B (en) * | 2016-10-26 | 2018-11-30 | 珠海格力电器股份有限公司 | A kind of rotor and motor and compressor with it |
| EP3745560A4 (en) * | 2018-03-16 | 2021-04-14 | Gree Electric Appliances, Inc. of Zhuhai | Rotor structure, permanent magnet auxiliary synchronous reluctance motor and electric vehicle |
| US11689071B2 (en) | 2018-03-16 | 2023-06-27 | Gree Electric Appliances, Inc. Of Zhuhai | Rotor structure, permanent magnet auxiliary synchronous reluctance motor, and electric vehicle |
| CN112436625A (en) * | 2019-08-26 | 2021-03-02 | 安徽美芝精密制造有限公司 | Rotor, motor, compressor and refrigeration plant |
| CN112436625B (en) * | 2019-08-26 | 2022-05-24 | 安徽美芝精密制造有限公司 | Rotor, motor, compressor and refrigeration plant |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150311 Effective date of abandoning: 20160817 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |