CN202889138U - Parallel type composite excitation brushless direct-current motor - Google Patents
Parallel type composite excitation brushless direct-current motor Download PDFInfo
- Publication number
- CN202889138U CN202889138U CN 201220455578 CN201220455578U CN202889138U CN 202889138 U CN202889138 U CN 202889138U CN 201220455578 CN201220455578 CN 201220455578 CN 201220455578 U CN201220455578 U CN 201220455578U CN 202889138 U CN202889138 U CN 202889138U
- Authority
- CN
- China
- Prior art keywords
- excitation
- electric machine
- stator
- synchronous motor
- winding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
Images
Abstract
The utility model discloses a parallel type composite excitation brushless direct-current motor. The rotors of a permanent magnet synchronous motor (PMSM) portion and a doubly salient electro-magnetic motor (DSEM) portion are axially arranged; the stators of the two are respectively arranged at the left and right two sides in a casing; the iron cores of the stators employ an armature winding in common; an excitation winding is arranged on the iron core of the stator of the DSEM portion; each coil of each phase armature winding of the composite excitation motor traverses through two adjacent stator teeth of the same phase of the PMSM portion and the corresponding stator pole of the DSEM portion, and the armature winding phase sequence and the phase winding distribution of the two portions are respectively consistent; and each phase winding of the motor is embedded and winding on the stator tooth of the PMSM portion and the corresponding stator pole of the DSEM portion and is closed after passing through the iron cores of the stators of the two portions. According to the parallel type composite excitation brushless direct-current motor, the winding utilization rate is high, the air gap magnetic field adjusting scope is wide, and the de-excitation protection problem when a motor internal short circuit fault happens is effectively solved.
Description
Technical field
The utility model relates to a kind of block form mixed excitation electric machine, particularly a kind of block form composite excitation brushless direct-current machine.
Background technology
Compare with traditional electro-magnetic motor, magneto particularly rare-earth permanent-magnet electric machine has the remarkable advantages such as simple and reliable for structure, that power density is high, efficient is high, but magneto is owing to adopting single permanent magnet excitation, air-gap field is regulated difficulty, under generator operation, load variations or rotation speed change, output voltage changes thereupon.Electro-magnetic motor can be regulated direct current or AC excitation electric current, thereby can regulate easily air-gap field, but the magneto power density is low relatively, and complex structure needs brush when particularly excitation winding is on rotor, therefore is difficult to accomplish the high-speed cruising of motor.Mixed excitation electric machine is to introduce the auxiliary electrical magnetic part winding on the basis of magneto, reaches the purpose of improving magneto driving or pressure regulating performance.Cause in recent years people's extensive concern in electric automobile, field of wind power generation.
Block form mixed excitation electric machine structural principle is simple, is easy to realize the bidirectional modulation of exciting current, is an important directions of mixed excitation electric machine technical research.It is the primary structure form of present block form mixed excitation electric machine that the same type motor consists of the block form mixed excitation electric machine, comprises two kinds: permagnetic synchronous motor part and electric excitation synchronous motor form (patent CN102005876A) side by side; Doubly salient permanent magnet motor and electric excitation biconvex electrode electric machine part form (patent CN1545189A) side by side.The former hybrid exciting synchronous motor complex structure, electric excitation mode is AC excitation, excitation structure and control are complicated; The latter is simple and reliable for structure, but also has the problem that mixed excitation biconvex pole motor T voltage and torque pulsation are large, power density is on the low side.
It also is feasible that the inhomogeneity motor consists of the block form mixed excitation electric machine, patent CN100386853C adopts traditional permagnetic synchronous motor part and electric excitation biconvex electrode electric machine partly to constitute mixed excitation electric machine, realized the non-brushing of exciting current bidirectional modulation and whole motor, but this block form mixed excitation electric machine adopts two kinds of brushless electric machines directly to make up, two parts electric machine structure is the traditional structure form, because the difference of two types of motor induced potential waveforms, so that two class motor combination efficient are lower, affect its power density; In addition, two parts armature winding inside is separate, the outside is connected in series, although exciting current can bidirectional modulation, still the problem of De-excitation at fault in the time of can't solving magneto part armature winding internal short-circuit, this so that this motor under highly reliable requirement condition, be restricted such as the application in the aviation power system.
Based on above analysis, the inventor proposes a kind of novel composite excitation brushless direct-current machine, and this case produces thus.
The utility model content
The purpose of this utility model; be to provide a kind of block form composite excitation brushless direct-current machine; it is with permagnetic synchronous motor part and electric excitation biconvex electrode electric machine part organic assembling; realize the efficient stack of two parts induced potential; the problem of effective field suppression protection has significant application value in airplane power source, field of wind power generation when solving the motor internal short trouble.
In order to reach above-mentioned purpose, solution of the present utility model is:
A kind of block form composite excitation brushless direct-current machine, in same casing, the rotor coaxial of permagnetic synchronous motor part and electric excitation biconvex electrode electric machine part is installed, the stator of the two is installed in respectively the left and right sides of casing inside, the stator core of the stator core of described permagnetic synchronous motor part and electric excitation biconvex electrode electric machine part shares a cover armature winding, and excitation winding is installed in the stator core of electric excitation biconvex electrode electric machine part; Described permagnetic synchronous motor partly adopts built-in tangential magnetic steel rotor structure or surface-mount type magnetic steel rotor structure.The every circle coil of described mixed excitation electric machine armature winding passes two adjacent stators teeth and the corresponding electric excitation biconvex electrode stator poles of the same phase of permagnetic synchronous motor part simultaneously, it is identical with the armature winding of electric excitation biconvex electrode electric machine part that the armature winding phase sequence of permagnetic synchronous motor part and phase winding distribute, the simultaneously embedding of the every phase winding of described direct current machine is on the corresponding stator poles of permagnetic synchronous motor partial stator tooth and electric excitation biconvex electrode electric machine part, through closed after the two-part stator core.
Half that the stator poles of above-mentioned electric excitation biconvex electrode electric machine part and rotor number of poles are respectively permagnetic synchronous motor partial stator number of poles and rotor number of poles, and the stator poles of electric excitation biconvex electrode electric machine part evenly distributes, the wide slot opening that equals of stator poles, it is wide that rotor pole is wider than stator poles.
Above-mentioned direct current machine is three phase electric machine or polyphase machine.
Above-mentioned direct current machine adopts three phase electric machine, and electric excitation biconvex electrode electric machine partly is the 3N/2N electrode structure, and permagnetic synchronous motor partly is 6N groove/4N electrode structure, and wherein N is the integer greater than 1.
After adopting such scheme, the utility model is compared with existing mixed excitation electric machine structure has following beneficial features:
(1) to be wider than stator poles wide for electric excitation biconvex electrode electric machine part rotor pole, and the armature winding induced potential is trapezoidal wave, has realized efficient stack and the adjusting of armature winding electromotive force;
(2) the armature winding coil passes permanent magnet excitation and the two-part stator of electric excitation simultaneously, not only can realize by regulating exciting current the adjusting of armature winding induced potential, and the armature winding internal short-circuit can regulate offset the magnetic field that permanent magnet excitation produces by electro-magnetic motor part exciting current, thus efficient demagnetization when realizing motor short circuit in winding fault;
(3) therefore excitation winding has realized non-brushing on the stator of electric excitation biconvex electrode electric machine part, because the rotor structure of permagnetic synchronous motor part and double salient-pole electric machine part is simple and reliable, is conducive to the high-speed cruising of motor simultaneously;
(4) according to the difference of application scenario, appropriate design permagnetic synchronous motor part and the two-part core length ratio of electric excitation biconvex electrode electric machine part can realize the voltage-regulation scope of the permanent torque of the electric operation of motor/output-constant operation scope or generator operation;
(5) because permanent magnetism part and electric excitation part magnetic circuit are separate, regulate the irreversible demagnetization that exciting current can not cause permanent magnet, the motor reliability is high, and electric excitation efficiency is high;
(6) this composite excitation brushless direct-current machine is given full play to the high power density advantage of permagnetic synchronous motor, in conjunction with the adjustable advantage in electric excitation biconvex electrode electric machine magnetic field, realizes the purpose that whole power of motor density is high, the flux control performance is good.
Description of drawings
Fig. 1 is axial section schematic diagram of the present utility model;
Fig. 2 (a) is the schematic cross-section of the utility model embodiment permagnetic synchronous motor part;
Fig. 2 (b) is the schematic cross-section of the utility model embodiment electric excitation biconvex electrode electric machine part;
Fig. 3 is the present embodiment motor internal windings in series mode distribution schematic diagram;
Fig. 4 is the winding inserting structural representation;
Fig. 5 is the three-phase bridge rectification circuit schematic diagram.
Component symbol explanation among the figure:
The 1-rotating shaft, the 2-bearing, the 3-casing, 4-keyway, the stator core of 5-electric excitation biconvex electrode electric machine part, the rotor core of 6-electric excitation biconvex electrode electric machine part, the stator core of 7-permagnetic synchronous motor part, 8-permanent magnet, the rotor core of 9-permagnetic synchronous motor part, 10-armature winding, the 11-excitation winding.
Embodiment
Below with reference to accompanying drawing, the technical solution of the utility model is elaborated.
As shown in Figure 1, the utility model provides a kind of block form composite excitation brushless direct-current machine, comprise casing and be installed in casing interior electric excitation biconvex electrode electric machine part and permagnetic synchronous motor part, permagnetic synchronous motor part and electric excitation biconvex electrode electric machine part are installed in respectively the left and right sides of casing 3 inside.Wherein, permanent magnet 8 is embedded in the rotor of permagnetic synchronous motor part, and the rotor core 6 of the rotor core 9 of permagnetic synchronous motor part and electric excitation biconvex electrode electric machine part all is installed in the rotating shaft 1, fixing by keyway 4, bearing 2 supporting revolving shafts 1 are realized the two coaxial rotating, cooperate shown in Figure 1; And the stator core 7 of the stator core 5 of electric excitation biconvex electrode electric machine part and permagnetic synchronous motor part shares a cover armature winding 10, and excitation winding 11 is installed in the stator core 5 of electric excitation biconvex electrode electric machine part, thereby realizes non-brushing of the present utility model.
In the utility model, the rotor of permagnetic synchronous motor part adopts built-in tangential magnetic steel rotor structure or surface-mount type magnetic steel rotor structure, and stator core is formed by silicon steel plate stacking; Stator core and rotor core in the electric excitation biconvex electrode electric machine part form by silicon steel plate stacking.The every circle coil of every phase armature winding passes two adjacent stators teeth and the corresponding electric excitation biconvex electrode stator poles of the same phase of permagnetic synchronous motor part simultaneously.It is identical with the armature winding of electric excitation biconvex electrode electric machine part that the armature winding phase sequence of permagnetic synchronous motor part and phase winding distribute, the simultaneously embedding of the every phase winding of the utility model direct current machine is on the corresponding stator poles of permagnetic synchronous motor partial stator tooth and electric excitation biconvex electrode electric machine part, through closed after the two-part stator core, directly not closed in the stator core of permagnetic synchronous motor part.
Half that the stator poles of electric excitation biconvex electrode electric machine part and rotor number of poles are respectively the permagnetic synchronous motor partial stator number of teeth and rotor number of poles, the stator poles of electric excitation biconvex electrode electric machine part evenly distributes, the wide slot opening that equals of stator poles, it is wide that rotor pole is wider than stator poles.
Need to prove, the utility model can be mutually even more multiphase DC motor of three-phase, four phases, five, below will be introduced structure of the present utility model and beneficial effect by specific embodiment.
Shown in Fig. 2 (a) and Fig. 2 (b), that the utility model is as an embodiment of three-phase brushless dc motor, electric excitation biconvex electrode electric machine partly is 12/8 electrode structure, permagnetic synchronous motor partly is that 24 grooves/16 utmost points, rotor cutting are to the magnetization magnet structure, be respectively the schematic cross-section (wherein not drawing armature winding and excitation winding) of permagnetic synchronous motor part and electric excitation biconvex electrode electric machine part shown in Fig. 2 (a) and Fig. 2 (b), as can be seen from the figure, permagnetic synchronous motor partly adopts and concentrates the winding distribution mode.On the locus, A, B, the C three-phase of permagnetic synchronous motor part has half corresponding one by one with A, B, the C three-phase of electric excitation biconvex electrode electric machine part, among the figure, Ap, Bp, Cp and Ae, Be, Ce represent respectively corresponding to the permagnetic synchronous motor partial stator tooth of threephase armature winding and the electric excitation biconvex electrode electric machine partial stator utmost point.The stator poles of electric excitation biconvex electrode electric machine part evenly distributes, the wide slot opening that equals of stator poles, and it is wide that rotor pole is wider than stator poles.
From Fig. 2 (a) and Fig. 2 (b), can find out, half is corresponding one by one on the locus with the electric excitation biconvex electrode electric machine partial stator utmost point for the every phase stator tooth of permagnetic synchronous motor part, the simultaneously embedding of every phase winding is on the corresponding stator poles of permagnetic synchronous motor partial stator tooth and electric excitation biconvex electrode electric machine part, take the A phase winding as example, its simultaneously embedding is on the corresponding stator poles Ae of two stator tooth Ap of permagnetic synchronous motor part and electric excitation biconvex electrode electric machine part.Fig. 3 has provided the windings in series distribution mode of two kinds of parts, half stator tooth of the every phase of permagnetic synchronous motor is corresponding in the locus with the every phase stator poles of electric excitation biconvex electrode electric machine, therefore the armature winding coil on other half stator tooth of permagnetic synchronous motor alternately is connected with second half stator tooth in the permagnetic synchronous motor part first, corresponding stator tooth (utmost point) is directly connected on the last locus, and actual winding inserting as shown in Figure 4.Because two kinds of motors share a cover winding coil, permanent magnet excitation and electric excitation magnetic potential acting in conjunction are in same armature winding coil, can change by the dual regulation of electric excitation the synthetic magnetic linkage of winding, thereby can effectively change the winding induced voltage, can realize effective De-excitation at fault for motor internal armature winding short-circuit conditions simultaneously.
The utility model block form composite excitation brushless direct-current machine, excitation winding is installed on the stator of electric excitation biconvex electrode electric machine part, regulate the exciting current size and Orientation, can change the magnetic field size and Orientation of the armature winding of electric excitation biconvex electrode electric machine part, thereby change whole armature winding resultant magnetic field, motor internal winding induced potential is adjusted.Rationally change the axial length ratio of electric excitation biconvex electrode electric machine part and permagnetic synchronous motor part, regulate the exciting current size and Orientation, motor internal armature flux amplitude can keep substantially constant, so motor internal winding induced potential amplitude can be zero.
Fig. 5 is the present embodiment three-phase bridge rectifier circuit schematic diagram during as DC generator.
In sum, a kind of block form composite excitation brushless direct-current machine of the utility model, in same casing, be divided into permagnetic synchronous motor part and electric excitation biconvex electrode electric machine part two parts, separate, the coaxial installation of two parts rotor, two parts stator casing left and right sides that coexists that is separated from each other.Permagnetic synchronous motor partly adopts built-in tangential magnetic steel rotor structure or surface-mount type magnetic steel rotor structure, and stator core is formed by silicon steel plate stacking.Stator and the rotor core of electric excitation biconvex electrode electric machine part form by silicon steel plate stacking, stator poles and rotor number of poles are respectively the stator number of teeth of permagnetic synchronous motor part and half of rotor number of poles, the stator poles of electric excitation biconvex electrode electric machine part evenly distributes, the wide slot opening that equals of stator poles, nested armature winding and excitation winding on the stator poles.The wide stator poles of being a bit larger tham of rotor pole of electric excitation biconvex electrode electric machine part is wide, so that the induced potential waveform of the armature winding of electric excitation biconvex electrode electric machine part is trapezoidal wave, thereby close with the induced potential waveform of permagnetic synchronous motor part armature winding, realize efficient stack and the adjusting of induced potential, thereby significantly improve power and the torque density of motor.
The every phase armature winding of whole motor all passes through after the stator core of the stator core of permagnetic synchronous motor part and electric excitation biconvex electrode electric machine part closed, and the simultaneously embedding of the coil of every phase winding is on the corresponding stator poles of two stator tooths of permagnetic synchronous motor part and electric excitation biconvex electrode electric machine part.The armature winding of the armature winding of permagnetic synchronous motor part and electric excitation biconvex electrode electric machine part is direct series relationship at motor internal, as seen, the armature winding of permagnetic synchronous motor part is directly not closed in the stator core of permagnetic synchronous motor part like this, greatly reduced the possibility of permagnetic synchronous motor part armature winding internal short-circuit, and, realized that the exciting current of electric excitation biconvex electrode electric machine part is regulated the efficient wide region of whole armature winding induced potential.
Above embodiment only is explanation technological thought of the present utility model; can not limit protection range of the present utility model with this; every technological thought according to the utility model proposes, any change of doing on the technical scheme basis all falls within the utility model protection range.
Claims (4)
1. block form composite excitation brushless direct-current machine, comprise casing and be arranged on casing interior electric excitation biconvex electrode electric machine part and permagnetic synchronous motor part, the rotor coaxial of permagnetic synchronous motor part and electric excitation biconvex electrode electric machine part is installed, the stator of the two is located at respectively the left and right sides of casing inside, the stator core of the stator core of described permagnetic synchronous motor part and electric excitation biconvex electrode electric machine part shares a cover armature winding, and excitation winding is installed in the stator core of electric excitation biconvex electrode electric machine part; It is characterized in that: the every circle coil of described mixed excitation electric machine armature winding passes two adjacent stators teeth and the corresponding electric excitation biconvex electrode stator poles of the same phase of permagnetic synchronous motor part simultaneously, it is identical with the armature winding of electric excitation biconvex electrode electric machine part that the armature winding phase sequence of permagnetic synchronous motor part and phase winding distribute, the simultaneously embedding of the every phase winding of described direct current machine is on the corresponding stator poles of permagnetic synchronous motor partial stator tooth and electric excitation biconvex electrode electric machine part, through closed after the two-part stator core.
2. a kind of block form composite excitation brushless direct-current machine as claimed in claim 1, it is characterized in that: half that the stator poles of described electric excitation biconvex electrode electric machine part and rotor number of poles are respectively permagnetic synchronous motor partial stator number of poles and rotor number of poles, and the stator poles of electric excitation biconvex electrode electric machine part evenly distributes, the wide slot opening that equals of stator poles, it is wide that rotor pole is wider than stator poles.
3. a kind of block form composite excitation brushless direct-current machine as claimed in claim 1, it is characterized in that: described direct current machine is three phase electric machine or polyphase machine.
4. a kind of block form composite excitation brushless direct-current machine as claimed in claim 3, it is characterized in that: described direct current machine adopts three phase electric machine, electric excitation biconvex electrode electric machine partly is the 3N/2N electrode structure, and permagnetic synchronous motor partly is 6N groove/4N electrode structure, and wherein N is the integer greater than 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220455578 CN202889138U (en) | 2012-09-07 | 2012-09-07 | Parallel type composite excitation brushless direct-current motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220455578 CN202889138U (en) | 2012-09-07 | 2012-09-07 | Parallel type composite excitation brushless direct-current motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202889138U true CN202889138U (en) | 2013-04-17 |
Family
ID=48080525
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220455578 Withdrawn - After Issue CN202889138U (en) | 2012-09-07 | 2012-09-07 | Parallel type composite excitation brushless direct-current motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202889138U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832768A (en) * | 2012-09-07 | 2012-12-19 | 南京航空航天大学 | Parallel hybrid excitation brushless direct-current motor |
| CN103683728A (en) * | 2013-12-05 | 2014-03-26 | 张学义 | Method for producing electromagnet and permanent magnet invisible magnetic pole hybrid excitation rotor |
| CN106357078A (en) * | 2015-07-23 | 2017-01-25 | 哈尔滨电机厂有限责任公司 | Parallel rotor structured hybrid-excited motor brushless electro-excitation rotor pole |
| CN107896038A (en) * | 2017-10-31 | 2018-04-10 | 南京航空航天大学 | A kind of double winding mixing excitation brushless DC integrated power generation system and its control method |
-
2012
- 2012-09-07 CN CN 201220455578 patent/CN202889138U/en not_active Withdrawn - After Issue
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832768A (en) * | 2012-09-07 | 2012-12-19 | 南京航空航天大学 | Parallel hybrid excitation brushless direct-current motor |
| CN102832768B (en) * | 2012-09-07 | 2014-08-20 | 南京航空航天大学 | Parallel hybrid excitation brushless direct-current motor |
| CN103683728A (en) * | 2013-12-05 | 2014-03-26 | 张学义 | Method for producing electromagnet and permanent magnet invisible magnetic pole hybrid excitation rotor |
| CN106357078A (en) * | 2015-07-23 | 2017-01-25 | 哈尔滨电机厂有限责任公司 | Parallel rotor structured hybrid-excited motor brushless electro-excitation rotor pole |
| CN106357078B (en) * | 2015-07-23 | 2018-07-13 | 哈尔滨电机厂有限责任公司 | Parallel rotor structure mixed excitation electric machine brush-less electrically exciting rotor magnetic pole |
| CN107896038A (en) * | 2017-10-31 | 2018-04-10 | 南京航空航天大学 | A kind of double winding mixing excitation brushless DC integrated power generation system and its control method |
| CN107896038B (en) * | 2017-10-31 | 2020-07-28 | 南京航空航天大学 | Double-winding hybrid excitation brushless direct current integrated power generation system and control method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103208893B (en) | Induced excitation formula composite excitation brushless synchronous motor | |
| CN105048740B (en) | A kind of permanent magnetism and variable reluctance block form mixed excitation brushless | |
| CN105790456B (en) | A kind of three-phase hybrid excitation flux switch motor structure | |
| CN101562383B (en) | Single-phase reluctance generator | |
| CN101699713A (en) | Rotor sectional type flux switching motor and method for improving sine degree of back electromotive force thereof | |
| CN102035270A (en) | Axial excitation double salient pole motors | |
| CN106487178B (en) | A kind of disc type bimorph transducer composite excitation motor | |
| CN104201852A (en) | Winding-complementary permanent magnet rotor magnetic-flux switching motor | |
| CN102843008A (en) | Parallel type mixed excitation alternating-current generator | |
| CN101262160B (en) | Mixed excited magnetic pass switching electromotor | |
| CN103490575B (en) | Multiple tooth mixing exciter panel type wind-driven generator | |
| CN102005879B (en) | Electric excitation part double stator brushless mixed excitation synchronous generator | |
| CN105811696A (en) | Hybrid excitation type composite magnetic flux switching permanent-magnet motor | |
| CN201860217U (en) | Parallel-structured brushless composite-excitation synchronous motor without additional air gap | |
| CN202889138U (en) | Parallel type composite excitation brushless direct-current motor | |
| CN102005875B (en) | Brushless parallel-structure hybrid excitation synchronous generator without additional air gap | |
| CN109038990A (en) | High torque density error-tolerance type mixing magnetic flow permanent magnet motor | |
| CN102832767B (en) | Parallel hybrid excitation brushless direct-current fault-tolerant motor | |
| CN101478207B (en) | Dual feedback mixed magnetic pole permanent magnetic motor | |
| CN201188577Y (en) | Single-phase reluctance generator | |
| CN103095085A (en) | Four-phase doubly-salient motor | |
| CN201860232U (en) | Hybrid excitation synchronous generator in parallel structure without electric excitation rotor | |
| CN202798389U (en) | Side-by-side mixing excitation alternating current generator | |
| CN102832768B (en) | Parallel hybrid excitation brushless direct-current motor | |
| CN202798388U (en) | Side-by-side mixing excitation brushless direct current fault-tolerant motor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130417 Effective date of abandoning: 20140820 |
|
| RGAV | Abandon patent right to avoid regrant |