CN2308206Y - Permanent-magnet electric motor with high-efficient energy-saving very-large torque - Google Patents
Permanent-magnet electric motor with high-efficient energy-saving very-large torque Download PDFInfo
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- CN2308206Y CN2308206Y CN 97221033 CN97221033U CN2308206Y CN 2308206 Y CN2308206 Y CN 2308206Y CN 97221033 CN97221033 CN 97221033 CN 97221033 U CN97221033 U CN 97221033U CN 2308206 Y CN2308206 Y CN 2308206Y
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- magnetic pole
- slip ring
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- tail
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Abstract
The utility model relates to a permanent-magnet super large moment of torque direct current motor. A permanent-magnet rotor can be attracted or repelled by the electromagnetic force of a stator pole. The ratio of the pole number of the stator magnetic poles and the pole number of the rotor magnetic poles is 2 to 3 or the even number times of 2 to 3. The stator is divided into four groups; coils which are connected into a loop are wound on the stator magnetic pole; the coils of the corresponding stator magnetic pole or the corresponding magnetic pole groups are in end-to-end connection. Sliding rings are uniformly arranged on the circumference below the stator magnetic pole; a carbon brush is in elastic contact with the sliding rings and is connected with the rotor as a whole body. The utility model has the advantages of strong motor torque force, obvious energy saving effect, convenient speed regulation and simple fabrication.
Description
The utility model relates to the special energy-efficient super large torque moment permanent-magnet formula DC motor of a kind of structure, and this DC motor is a kind of electromechanical equipment that can use in each field such as industry, agricultural.
The operation principle of conventional DC motor all is based on electromagnetic force principle, and the power of the action of a magnetic field on the armature winding of energising that produces by magnetic pole of the stator drives rotor rotation.The structure of this motor is comparatively complicated, needs to use a large amount of armature winding, and itself is comparatively heavy, makees stator as not adopting permanent magnet, and then stator and rotor winding all need energising to produce electromagnetic force.Armature will produce back-emf in rotary course in addition, also will produce iron loss and other loss when armature core rotates in magnetic field, has wasted many energy.
The purpose of this utility model provides and a kind ofly by magnetic pole of the stator the electromagnetic attraction of rotor with salient pole and repulsion is driven the rotor rotation, and stator and rotor number of poles ratio is the high-torque direct stream motor of the even-multiple of 2: 3 or 2: 3.
The technical solution of the utility model is: according to the principle that the magnetic field same sex is repelled each other, there is a natural attraction between the sexes, it is the ratio mode of the even-multiple of 2: 3 or 2: 3 that this permanent magnetic DC motor has adopted stator and rotor magnetic pole number of poles ratio, and the mode that the magnetic pole of each ratio stator permanent magnet is entad arranged relatively by different in nature magnetic field is arranged in regular turn.The direction of every pair of magnetic pole of the stator should be consistent, and rotor block is built up by silicon steel sheet, and the pole-face width of each rotor magnetic pole should equate with the pole-face width of same motor stator permanent magnet pole.Each rotor magnetic pole has only an independently electromagnetism winding coil, in the same motor each electromagnetism winding coil be same around to, same line footpath, the structure of the same number of turn.Rotor magnetic pole is subjected to the effect of the suction and the repulsion of corresponding magnetic pole of the stator, promptly says by direction of rotation, makes the rotor magnetic pole that is in the magnetic pole of the stator rear produce and the different magnetic field of magnetic pole of the stator the tractive rotor magnetic pole; The rotor magnetic pole that is in magnetic pole of the stator the place ahead produces the magnetic field identical with magnetic pole of the stator, promotes rotor magnetic pole, thereby makes the rotor rotation.The distributor slip ring be arranged in equably with the concentric circumference of rotor on, and and rotor be connected as a single entity.The slip ring gap is separated by dead slot or insulator idle loop.Slip ring quantity=rotor magnetic pole number * 2.Carbon brush flexibly contacts the distributor slip ring by spring pressure.Each carbon brush and distributor slip ring institute arc length of contact are equal to or slightly less than the arc length of two slip rings.The positive and negative electrode of two carbon brush or two groups of carbon brush external direct current power supplies.The connection of rotor magnetic pole coil and distributor slip ring is: after determining the first rotor magnetic pole, the head end of the coil of this magnetic pole is inserted a slip ring, that the tail end of this coil is connected on is corresponding with head end, on the slip ring of symmetry, respectively the head end of all the other rotor coils is connect the distributor slip ring successively every a slip ring in the direction of the clock then.
Advantage of the present utility model is: because almost all energisings simultaneously of each rotor winding when DC motor is sent electricity, the electromagnetic field that produces is scolded by the permanent magnetism field intensity of stator and strong the suction, therefore its torque is bigger, this permanent magnetic DC motor makes full use of the magnetic energy of permanent magnet, so its energy-saving effect is remarkable especially.Because its rotor number of poles is less and rotor magnetic pole is independent separately loop construction, so make simply, it is low to produce cost again.
Below in conjunction with description of drawings energy-efficient super large torque moment permanent-magnet formula DC motor of the present utility model.
Fig. 1 is that stator and rotor magnetic pole number of poles ratio is the schematic diagram of 2: 3 DC motor.
Fig. 2 is that stator and rotor magnetic pole number of poles ratio is the schematic diagram of 4: 6 DC motor.
Fig. 3 is that stator and rotor magnetic pole number of poles ratio is the schematic diagram of 8: 12 DC motor.
Fig. 4 is the structure chart of this energy-conservation super large torque DC motor.
With reference to stator and rotor number of poles ratio shown in Figure 1 is the schematic diagram of 2: 3 super large moment of torsion permanent magnetic DC motor.Wherein magnetic pole of the stator 9 is a permanent magnet pole, is designated as D
1, D
2Magnetic pole of the stator 9 is arranged in the symmetric position in the electric machine casing 10 centripetally, adopts bolt or bonding way to be fastened on the inboard of electric machine casing 10.2 of rotors adopt silicon steel sheet to build up, and make 3, three magnetic poles of three magnetic poles and are wound with independently electromagnetism winding Z of direction unanimity, line footpath, the number of turn identical three respectively
1, Z
2And Z
3
The pole coil 4 of rotor 2 and the connection of distributor slip ring 5 are: the coil Z that determines rotor 2
1After, Z
1Head end insert a distributor slip ring 5, Z
1Tail end then insert corresponding with it, the symmetry another distributor slip ring 5.
Coil Z
2Head end insert and coil Z
1Be separated by the in the direction of the clock distributor slip ring 5 of a slip ring of head end, Z
2Tail end then insert corresponding with this slip ring, the symmetry another distributor slip ring 5.
Coil Z
3Head end insert and coil Z
2Be separated by the in the direction of the clock distributor slip ring 5 of a slip ring of head end, Z
3Tail end then insert corresponding with this slip ring, the symmetry another distributor slip ring 5.
Say that definitely six slip ring 5 clockwise directions on the distributor switch through subcoil Z respectively every a slip ring
1, Z
2And Z
3Head end, that the tail end of each coil inserts respectively is corresponding with head end, on three slip rings 5 in addition of symmetry.
Two carbon brush 7 are connected as a single entity by carbon brush body 11 and magnetic pole of the stator 9, and make around the axle center adjustable angle.Carbon brush 7 is by spring ground contact distributor slip ring 5, and each carbon brush 7 and 5 arc length of contact of distributor slip ring are equal to or less than the arc length of two distributor slip rings.
The carbon brush 7 that connects positive source respectively with rotor coil Z
2Tail end and Z
3Head end contact, the carbon brush 7 that connects power cathode respectively with rotor coil Z
2Head end and Z
3Tail end contact.Positive source wiring circle head end all produces the N pole field, and power cathode wiring circle head end all produces the S pole field.Therefore, Z
3The N pole field and the stator D that produce
2The N pole field repel each other and Z
2The S pole field and the stator D that produce
2The N utmost point inhale mutually, thereby motor rotor 2 is turned clockwise.
As can be seen from Figure 1, the magnetic field of all rotors 2 all is in the process of repelling each other and inhaling mutually with the permanent magnetic field of each self-corresponding magnetic pole of the stator 9.When only revealing out the idle loop of distributor slip ring 5, have only the 3 energising work of two rotor magnetic poles, and another rotor magnetic pole 3 still is in the process of being inhaled mutually by another magnetic pole of the stator 9 at carbon brush 7 two ends.By the time after turning over idle loop, all rotor magnetic poles 3 all are energized generation electromagnetic field separately, with two magnetic pole D of stator 9
1And D
2The same sex is inhaled mutually mutually, and the opposite sex is repelled each other.
The course of work of each rotor magnetic pole 3 is in the magnetic field same sex of the incipient stage magnetic pole of the stator 9 corresponding with it all the time repels each other, and the later half stage is inhaled mutually by another different in nature stator field 9.And institute's rotor magnetic pole 3 is almost all inhaled simultaneously and is scolded each self-corresponding magnetic pole of the stator 9.This is the energy-efficient of the utility model permanent magnetic DC motor, the basic place of super large moment of torsion.
Fig. 2 is the schematic diagram of 4: 6 super large moment of torsion permanent magnetic DC motor for stator and rotor number of poles ratio.Wherein magnetic pole of the stator 9 is used D
1, D
2, D
3And D
4Expression.They are entad arranged symmetrically by different in nature magnetic field, i.e. D
1And D
3Be the S utmost point, D
2And D
4Be the N utmost point.Magnetic pole of the stator 9 is fastened on the inboard of electric machine casing 10 by bolt or bonding way.
As can be seen from Figure 2, the order that 12 slip rings 5 of distributor insert rotor coils is: two slip rings of the left and right sides that switch through the slip ring of subcoil head end must connect the tail end of other coil, and two slip rings of the left and right sides that switch through the slip ring of subcoil tail end must connect the head end of other coil.Slip ring 5 is by meeting Z clockwise respectively
1, Z
4Head end, Z
3, Z
6Tail end, Z
2, Z
5Head end, Z
1, Z
4Tail end, Z
3, Z
6Head end, Z
2, Z
5Tail end.All the other 6 slip rings repeat said sequence and switch through subcoil.
Two carbon brush 7 are connected as a single entity by the magnetic pole of the stator 9 of carbon brush body 11 with motor, and make around center of circle adjustable angle, and each carbon brush 7 and slip ring 5 arc length of contact should be equal to or slightly less than the arc length of two slip rings.Two carbon brush 7 flexibly contact distributor slip ring 5 by spring pressure.
The both positive and negative polarity of DC power supply by carbon brush 7 respectively through with it the contact 4 or 6 slip rings 5 power to rotor coil, make each magnetic pole of rotor produce the different electromagnetic field of magnetic direction, scold and the suction motion with respect to the permanent magnetic field generation of stator 9, thereby make rotor 2 rotations.Change can make the rotor counter-rotating to the positive-negative polarity of two carbon brush, 7 power supplies.
As shown in Figure 2, Z
1, Z
4Head end connects power cathode, and tail end connects that positive source produces the N utmost point and by D
1, D
3Attract and by D
2, D
4Repel.Z
2, Z
5Head end connects positive source, and tail end connects that power cathode produces the S utmost point and by D
1, D
3Repel and by D
2, D
4Attract, thereby rotor is turned clockwise.
Z
3With Z
6Then be in commutation phase and be not energized, do not generate an electromagnetic field.
After moment shown in Figure 2, Z
3, Z
6Commutation finishes, and the both positive and negative polarity that power supply occurs respectively contacts 3 slip rings 5 respectively by two carbon brush 7.This moment, rotor coil was all switched on, and 6 magnetic poles that rotor coil produced are respectively Z
1Be the N utmost point, Z
2Be the S utmost point, Z
3Be the N utmost point, Z
4Be the N utmost point, Z
5Be the S utmost point, Z
6Be the N utmost point, each rotor magnetic pole 3 is D with the interaction force of stator 9 permanent magnetic fields
1The S utmost point inhale Z
1Scold Z
2, D
2The N utmost point inhale Z
2Scold Z
3, D
3The S utmost point inhale Z
4Scold Z
5, D
4The N utmost point inhale Z
5Scold Z
6The torque force maximum of this moment.
Fig. 3 is the schematic diagram of 8: 12 super large moment of torsion permanent magnetic DC motor for rotor number of poles ratio.Wherein magnetic pole of the stator 9 is 8, is denoted as D
1To D
8The permanent magnetic field direction is identical with center of circle symmetry, adjacent opposite.
Rotor magnetic pole 3 is 12, and each magnetic pole is wound with a pole coil independently.12 rotor magnetic pole coils are denoted as Z
1To Z
12The line footpath of 12 coils, the number of turn, around to identical.
12 rotor coils are divided into 3 groups, every group of 4 coils, i.e. Z
1, Z
4, Z
7, Z
10Be one group, Z
2, Z
5, Z
8, Z
11Be one group, Z
3, Z
6, Z
9, Z
12It is one group.4 coils in every group are the head and link to each other, and the tail tail links to each other.Totally 24 distributor slip rings 5 are separated by insulator or idle loop 6 each other, and the ring ring equates.
The connection mode of slip ring 5 and rotor magnetic pole coil 4 as shown in Figure 3, Z
1, Z
4, Z
7, Z
10The head of 4 coils links to each other, and the tail tail joins, head end connect with its mutually by on orthogonal 4 the distributor slip rings 5 in axle center, tail end connects on adjacent 45 ° 4 the orthogonal slip rings in addition of 4 slip rings being connect with its head end.Z
2, Z
5, Z
8, Z
114 coils also be that the head links to each other, the tail tail joins, head end connects and Z
1, Z
4, Z
7, Z
10Head end connects be separated by a clockwise slip ring and by on orthogonal 4 the distributor slip rings 5 in axle center of 4 slip rings 5, and tail end connects on adjacent 45 ° 4 the orthogonal slip rings in addition of 4 slip rings being connect with its head end.Z
3, Z
6, Z
9, Z
124 coils also be that the head links to each other, the tail tail joins, head end connects and Z
1, Z
4, Z
7, Z
10Tail end connects on 4 adjacent clockwise distributor slip rings 5 of 4 slip rings 5, and tail end connects on adjacent 45 ° 4 the orthogonal slip rings 5 in addition of 4 slip rings being connect with its head end.
The arc length of carbon brush 7 should be equal to or slightly less than the arc length of two slip rings.Two groups of positive and negative carbon brush 7 can be set, and the adjacent angle of positive and negative carbon brush should be 45 ° or 135 ° of corresponding settings.And make around center of circle adjustable angle.
As can be seen from Figure 3, Z
1, Z
4, Z
7, Z
104 rotor magnetic poles are in commutation position, do not produce magnetic field.Z
2, Z
5, Z
8, Z
11The head end of 4 pole coils connects power cathode by carbon brush, and tail end connects positive source, and 4 magnetic poles all produce the S pole field.Z
3, Z
6, Z
9, Z
12The head end of 4 pole coils connects positive source by carbon brush, and tail end connects power cathode, and 4 magnetic poles all produce the N pole field.The mutual movement relation of the permanent magnetic field of these magnetic poles and magnetic pole of the stator 9 is: D
1Be the S utmost point, inhale Z
1Scold Z
2D
2Be the N utmost point, inhale Z
2Scold Z
3D
3Be the S utmost point, inhale Z
3Scold Z
5D
4Be the N utmost point, inhale Z
5Scold Z
6D
5Be the S utmost point, inhale Z
6Scold Z
8D
6Be the N utmost point, inhale Z
8Scold Z
9D
7Be the S utmost point, inhale Z
9Scold Z
11D
8Be the N utmost point, inhale Z
11Scold Z
12After rotor turns over certain angle, each carbon brush then occurs and contact three slip rings respectively, all rotor coils all are powered and generate an electromagnetic field, and inhale extremely mutually, scold with 8 corresponding stator permanent magnets, so torque is big especially.
Fig. 4 is the structure chart of this energy-conservation super large torque DC motor.By screw or bonding way the magnetic pole of the stator 9 of casing 10 with stator body is fixed together, axle 1 passes the axle center of rotor 2, and coil 4 is on rotor magnetic pole 3.Positive and negative carbon brush 7 flexibly contacts distributor slip ring 5 by spring pressure, and carbon brush 7 is connected as a single entity by carbon brush body 11 and stator 9.
In the motor of above-mentioned various stator and rotor magnetic pole number of poles ratios, if rotor magnetic pole coil winding-direction difference then only need to change difference around the head and the tail connection to coil, and all properties of motor is constant.
Claims (7)
1. an energy-efficient super large torque moment permanent-magnet formula DC motor comprises permanent magnet magnetic pole of the stator (9), rotor magnetic pole (3), and rotor coil (4) and distributor slip ring (5) is characterized in that, stator and rotor magnetic pole number of poles ratio is the even-multiple of 2: 3 or 2: 3.
2. large torque moment permanent-magnet formula DC motor according to claim 1, it is characterized in that, the mode that the magnetic pole of each ratio stator permanent magnet (9) is entad arranged relatively by different in nature magnetic field is arranged in regular turn, the direction unanimity of every pair of magnetic pole of the stator (9), each rotor magnetic pole (3) has only an independently electromagnetism winding coil (4), in the same motor each electromagnetism winding coil (4) be same around to, same line footpath, the structure of the same number of turn, distributor slip ring (5) is done camber, be arranged in equably and circumference that rotor (2) is concentric on, and and rotor (2) is connected as a single entity, gap between the slip ring (5) is separated by dead slot or insulator idle loop (6), the quantity of slip ring (5) is 2 times of rotor magnetic pole (3), each carbon brush (7) and distributor slip ring (5) institute arc length of contact are equal to or slightly less than the arc length of two slip rings, two carbon brush or two groups of carbon brush (7) external direct current power supply are just, negative pole, the order of connection of rotor magnetic pole coil (4) and distributor slip ring (5) is: after determining the first rotor magnetic pole (3), the head end of this pole coil (4) is inserted a slip ring (5), the tail end of this coil (4) is connected on corresponding with head end, on the slip ring (5) of symmetry, respectively the head end of all the other rotor magnetic pole coils (4) is connect distributor slip ring (5) successively every a slip ring (5) in the direction of the clock then.
3. large torque moment permanent-magnet formula DC motor according to claim 2, it is characterized in that, magnetic pole of the stator (9) is 2: 3 with the number of poles ratio of rotor magnetic pole (3), magnetic pole of the stator (9) is arranged in the symmetric position in the electric machine casing (10) centripetally, and the pole coil (4) of rotor (2) and the order of connection of distributor slip ring (5) are: the coil Z that determines rotor (2)
1After, Z
1Head end insert a distributor slip ring (5), Z
1Tail end then insert corresponding with it, the symmetry another distributor slip ring (5), coil Z
2Head end insert and coil Z
1Be separated by the in the direction of the clock distributor slip ring (5) of a slip ring of head end, Z
2Tail end then insert corresponding with this slip ring, the symmetry another distributor slip ring (5), coil Z
3Head end insert and coil Z
2Be separated by the in the direction of the clock distributor slip ring (5) of a slip ring of head end, Z
3Tail end then insert corresponding with this slip ring, the symmetry another distributor slip ring (5).
4. large torque moment permanent-magnet formula DC motor according to claim 2, it is characterized in that, magnetic pole of the stator (9) is 4: 6 with the number of poles ratio of rotor magnetic pole (3), 4 magnetic pole of the stator (9) are entad arranged symmetrically by different in nature magnetic field, magnetic pole of the stator (9) is fastened on electric machine casing (10) inboard by bolt or bonding way, and rotor (2) has 6 magnetic pole Z
1, Z
2, Z
3, Z
4, Z
5And Z
6Rotor magnetic pole (3) is wound with respectively separately independently, around to, the line footpath solenoid (4) consistent with the number of turn, distributor slip ring (5) is done camber, and being divided into 12 five equilibriums equably, the solenoid (4) of rotor (2) with the order of connection of distributor slip ring (5) is: the magnetic pole Z that determines rotor 2
1After, coil Z in the direction of the clock
1And Z
4The head link to each other with head, tail links to each other with tail; Coil Z
2And Z
5The head link to each other with head, tail links to each other with tail; Coil Z
3And Z
6The head link to each other with head, tail links to each other with tail, 12 distributor slip rings (5) are divided into 3 groups, 4 slip rings (5) of every group are separated by 90 ° and are distributed on the circumference, the head end of two rotor coils that head end links to each other is connected on first group respectively by on two slip rings (5) of axle center symmetry, two tail ends are connected on 90 ° two slip rings (5) in addition of being separated by in this group slip ring, Z
1Head end meets Z
4Head end is connected on respectively on two slip rings (5), Z
1Tail end meets Z
4Tail end is connected on respectively in this group in addition on two slip rings (5) of 90 ° of being separated by.Z
2Head end meets Z
5Head end is connected on respectively with first group of slip ring is separated by on two slip rings (5) in second group of slip ring of a slip ring Z
2Tail end meets Z
5Tail end is connected on respectively in this group in addition on two slip rings (5) of 90 ° of being separated by.The Z3 head end meets Z
6Head end is connected on respectively with second group of slip ring is separated by on two slip rings (5) in the 3rd group of slip ring of a slip ring Z
3Tail end meets Z
6Tail end is connected on respectively in this group in addition on two slip rings (5) of 90 ° of being separated by.
5. large torque moment permanent-magnet formula DC motor according to claim 2, it is characterized in that, magnetic pole of the stator (9) is 8: 12 with the number of poles ratio of rotor magnetic pole (3), wherein the permanent magnetic field direction of 8 magnetic pole of the stator (9) is identical with center of circle symmetry, adjacent opposite, 12 rotor magnetic pole coils (4) of 12 rotor magnetic poles (3) are divided into 3 groups, every group of 4 coils, Z
1, Z
4, Z
7, Z
10Be one group, Z
2, Z
5, Z
8, Z
11Be one group, Z
3, Z
6, Z
9, Z
12Be one group, 4 coils in every group are the head and link to each other, and the tail tail links to each other, totally 24 distributor slip rings (5), and slip ring (5) is Z with the order of connection of rotor magnetic pole coil (4)
1, Z
4, Z
7, Z
10The head of 4 coils links to each other, and the tail tail joins, head end connect with its mutually by on orthogonal 4 the distributor slip rings in axle center (5), tail end connects on adjacent 45 ° 4 the orthogonal slip rings in addition of 4 slip rings being connect with its head end, Z
2, Z
5, Z
8, Z
114 coils also be that the head links to each other, the tail tail joins, head end connects and Z
1, Z
4, Z
7, Z
10Head end connects be separated by a clockwise slip ring and by on orthogonal 4 the distributor slip rings in axle center (5) of 4 slip rings 5, and tail end connects on adjacent 45 ° 4 the orthogonal slip rings (5) in addition of 4 slip rings being connect with its head end, Z
3, Z
6, Z
9, Z
124 coils also be that the head links to each other, the tail tail joins, head end connects and Z
1, Z
4, Z
7, Z
10Tail end connects on clockwise adjacent 4 the distributor slip rings (5) of 4 slip rings (5), and tail end connects on adjacent 45 ° 4 the orthogonal slip rings (5) in addition of 4 slip rings being connect with its head end.
6. large torque moment permanent-magnet formula DC motor according to claim 2, it is characterized in that, two carbon brush (7) flexibly contact distributor slip ring (5) by spring pressure, and magnetic pole of the stator (9) is fastened on the inboard of electric machine casing (10) by bolt or bonding way.
7. large torque moment permanent-magnet formula DC motor according to claim 2 is characterized in that rotor block is built up by silicon steel sheet, and the pole-face width of each rotor magnetic pole should equate with the pole-face width of same motor stator permanent magnet pole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97221033 CN2308206Y (en) | 1997-07-08 | 1997-07-08 | Permanent-magnet electric motor with high-efficient energy-saving very-large torque |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97221033 CN2308206Y (en) | 1997-07-08 | 1997-07-08 | Permanent-magnet electric motor with high-efficient energy-saving very-large torque |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2308206Y true CN2308206Y (en) | 1999-02-17 |
Family
ID=33936541
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97221033 Expired - Fee Related CN2308206Y (en) | 1997-07-08 | 1997-07-08 | Permanent-magnet electric motor with high-efficient energy-saving very-large torque |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2308206Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101702561B (en) * | 2009-11-16 | 2012-08-29 | 段学甫 | Direct-current magnetic reactance type driver |
-
1997
- 1997-07-08 CN CN 97221033 patent/CN2308206Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101702561B (en) * | 2009-11-16 | 2012-08-29 | 段学甫 | Direct-current magnetic reactance type driver |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |