CN105429423A - Dual-long-secondary and primary permanent magnetic field modulation linear motor for oil pumping unit - Google Patents
Dual-long-secondary and primary permanent magnetic field modulation linear motor for oil pumping unit Download PDFInfo
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- CN105429423A CN105429423A CN201510790264.6A CN201510790264A CN105429423A CN 105429423 A CN105429423 A CN 105429423A CN 201510790264 A CN201510790264 A CN 201510790264A CN 105429423 A CN105429423 A CN 105429423A
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- permanent magnet
- primary
- elementary
- primary permanent
- electric motors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
- H02K41/02—Linear motors; Sectional motors
- H02K41/03—Synchronous motors; Motors moving step by step; Reluctance motors
- H02K41/031—Synchronous motors; Motors moving step by step; Reluctance motors of the permanent magnet type
- H02K41/033—Synchronous motors; Motors moving step by step; Reluctance motors of the permanent magnet type with armature and magnets on one member, the other member being a flux distributor
Abstract
The invention discloses a dual-long-secondary and primary permanent magnetic field modulation linear motor for an oil pumping unit. The motor comprises two long secondary stators arranged symmetrically and oppositely, a short primary rotor arranged between the two long secondary stators, and air gaps formed between the short primary rotor and the long secondary stators, wherein the short primary rotor comprises primary iron cores arranged at equal intervals in a motion direction, and primary permanent magnets embedded between the adjacent primary iron cores; the primary iron cores are wider than the primary permanent magnets, so that primary teeth are formed on two sides of each primary iron core in the width direction; and armature windings are nested on the primary teeth. According to the motor, the armature windings and the permanent magnets are all arranged in the short primary rotor; the long secondary stators only adopt salient pole flat plate structures composed of magnetic materials; a primary magnetic field is modulated by air gap permeance changes caused by secondary salient poles to realize electromechanical energy conversion; and the motor has the characteristics of simple structure, high reliability, low cost and high thrust density.
Description
Technical field
The present invention relates to a kind of bilateral length used for oil extractor secondary primary permanent magnet type field modulation linear electric motors, belong to the technical field of oil pumping linear electric motors.
Background technology
Beam pumping unit utilizes electric energy to be converted to rotary motion, is converted to straight reciprocating motion again after deceleration through quadric chain, and its drive system energy loss is up to 28%, and add that revolving property causes detent torque large, system effectiveness is generally no more than 30%.Electric energy is directly converted to straight reciprocating motion by linear motor oil pumping machine, simplify mechanical transmission course, effectively improve efficiency, and machine shape size and weight all increase seldom during increasing stroke, particularly swabbing parameter can stepless changing, requiring to provide condition for realizing automatically controlling and meet oil production technology, is a kind of rising new pumping unit.
Compared with line inductance electromotor, the energy index of permanent magnetic linear synchronous motor is high, volume is little, lightweight, and therefore, in linear motor oil pumping machine recovers the oil, permanent magnetic linear synchronous motor obtains more application study.
Chinese patent CN2668844 and CN100535382 disclosed " beam pumping unit that a kind of linear electric motors drive ", in the linear electric motors that Chinese patent CN201212466 disclosed " oil-submersible extracting pump that DC stepping permanent magnetism straight line motor drives " etc. mentions, permanent magnet and armature winding are arranged on secondary and elementary respectively, owing to adopting long secondary structure, the consumption of permanent magnet is very large, and this causes system cost to increase undoubtedly.What " Modular complementary type primary permanent magnet linear and the motor module be made up of it " disclosed in Chinese patent CN101783573 disclosed " multiphase long-stator primary permanent magnet linear motor " and Chinese patent CN102013786 used for reference that the operation principle of doubly salient permanent magnet motor or flux switch permanent magnet motor and stator permanent magnetic type structure obtain be all placed in permanent magnet and armature winding, and primary permanent magnet linear motor that elementary, secondary long stator is only made up of permeability magnetic material then solves the large problem of permanent magnet consumption well.In addition, Chinese patent CN104052238 disclosed " a kind of bilateral primary permanent magnet vernier linear electric motors " also uses primary permanent magnet type structure, and the magnetic gear up effect of vernier motor can be utilized to realize power conversion, but multipole is mounted on the surface of armature tooth to permanent magnet, interelectrode magnetic leakage is large and permanent magnet utilance is low, causes motor power factor and pushing force density all lower.At present, study the acting in conjunction that the field modulation magneto comparing focus utilizes fundamental wave magnetic field and harmonic field in the world, higher power density can be realized.Therefore, this patent use for reference primary permanent magnet linear motor design feature and based on magnetic field modulation principle, a kind of primary permanent magnet type field modulation linear electric motors of new structure are proposed, this electric machine structure is simple, reliability is high, processing cost is low, and there is stronger thrust output, higher forces density and comparatively low thrust fluctuation, be very suitable for the long stator application scenario that such as linear motor oil pumping machine recovers the oil.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of bilateral length used for oil extractor secondary primary permanent magnet type field modulation linear electric motors.The present invention in order to solve existing linear motor oil pumping machine recover the oil adopt permanent magnetic linear synchronous motor secondary long stator structure in permanent magnet consumption large, the problem that processing cost is high, and the high power density characteristic that the magnetic field modulation effect of using for reference field modulating motor brings, provide a kind of secondary primary permanent magnet type field of elementary bilateral length that armature winding and permanent magnet is all placed in and modulate linear electric motors topological structure.
Technical scheme of the present invention is as follows:
A kind of bilateral length used for oil extractor secondary primary permanent magnet type field modulation linear electric motors, comprise 2 long secondary stators that symmetry is oppositely arranged, the air gap being arranged on the short elementary mover between described 2 long secondary stators and being arranged between described short elementary mover and described long secondary stator;
Described short elementary mover comprises along the elementary iron core of direction of motion equi-spaced apart arrangement, embedding is arranged on the primary permanent magnet body between Neighboring primary iron core, the width of described elementary iron core is greater than primary permanent magnet body width to form elementary tooth in the Width both sides of described elementary iron core, nestedly on described elementary tooth is provided with armature winding.The described elementary tooth protruding from both sides, elementary interferric width direction is towards described long secondary stator.
Preferred according to the present invention, the secondary salient pole that described long secondary stator comprises plate shaped secondary iron core and equidistantly arranges at described plate shaped secondary iron core inner surface, described secondary salient pole and described elementary tooth are oppositely arranged.
Preferred according to the present invention, the number of one-sided described elementary tooth: N
p, armature winding coiling number of pole-pairs: p
w, one-sided adjacent described elementary tooth centre distance: τ
pwith the centre distance of adjacent described secondary salient pole: τ
s, meet following relational expression (I):
N
p·τ
p＝(N
p/2+p
w)·τ
s(I)
In formula (I), N
p=6k, k are positive integer; The block number of described primary permanent magnet body is N
p+ 1.
Preferred according to the present invention, described primary permanent magnet body magnetizes along the described short elementary mover direction of motion, and adjacent described primary permanent magnet body magnetizing direction is contrary.
Preferred according to the present invention, be respectively arranged with balance gear at described short elementary mover along on the primary permanent magnet body end face at direction of motion two ends.The advantage herein designed is, for balancing short elementary mover end magnetic circuit, obtains symmetrical phase winding magnetic linkage.
Preferred according to the present invention, the width of described balance gear is equal with the width of described elementary iron core.
Preferred according to the present invention, the secondary salient pole that described 2 plate shaped secondary iron core inner surfaces are arranged respectively is arranged in alignment each other.
Preferred according to the present invention, the secondary salient pole that described 2 plate shaped secondary iron core inner surfaces are arranged respectively is each other in being crisscross arranged.
Preferred according to the present invention, the secondary salient pole that described 2 plate shaped secondary iron core inner surfaces are arranged respectively each other in being crisscross arranged, staggered difference in size: the centre distance τ being not more than adjacent described secondary salient pole
s1/2nd.The advantage herein designed is, reduces short elementary mover force oscillation.
Preferred according to the present invention, described secondary salient pole end face width accounts for the ratio 0.4-0.6 of adjacent described secondary salient pole centre distance τ s.
Preferred according to the present invention, the width of described elementary tooth is less than the width of secondary salient pole.
Beneficial effect of the present invention:
The invention provides a kind of bilateral length used for oil extractor secondary primary permanent magnet type field modulation linear electric motors, recover the oil compared with the long stator type permanent magnetic linear synchronous motor that adopts with existing linear motor oil pumping machine, have the following advantages:
1. modulation linear electric motors in field of the present invention, permanent magnet and armature winding are all placed in short elementary mover, and long secondary stator is only the salient pole slab construction be made up of permeability magnetic material, have the advantages that structure is simple, reliability is high, processing cost is low;
2. modulation linear electric motors in field of the present invention are based on the work of magnetic field modulation principle, and the air-gap permeance utilizing secondary salient pole to cause change realizes energy converting between mechanical to primary magnetic field modulation, can realize higher pushing force density;
3. modulation linear electric motors in field of the present invention, armature winding design all adopts concentratred winding form, and winding technique is simple, and be easy to realize modularization and roll off the production line and the processing of mover modularization, Automatic manual transmission is convenient;
4. modulation linear electric motors in field of the present invention adopt bilateral secondary structure, and elementary mover is not by the impact of monolateral side draw, and bilateral secondary salient pole can arrange by relative misalignment certain angle, can effectively reduce mover force oscillation.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention's bilateral length used for oil extractor secondary primary permanent magnet type field modulation linear electric motors;
In Fig. 1: 1, long secondary stator; 11, secondary iron core; 12, secondary salient pole;
2, short elementary mover; 21, elementary iron core; 22, primary permanent magnet body; 23, elementary tooth; 24, armature winding; 25, balance gear;
3, air gap.
Shown arrow represents primary permanent magnet body magnetizing direction in FIG.
Embodiment
Below in conjunction with embodiment and Figure of description, the present invention is described in detail, but is not limited thereto.
As shown in Figure 1.
Embodiment 1,
A kind of bilateral length used for oil extractor secondary primary permanent magnet type field modulation linear electric motors, comprise 2 long secondary stators 1 that symmetry is oppositely arranged, the air gap 3 being arranged on the short elementary mover 2 between described 2 long secondary stators 1 and being arranged between described short elementary mover 2 and described long secondary stator 1;
Described short elementary mover 2 comprises elementary unshakable in one's determination 21, embedding is arranged on the primary permanent magnet body 22 between Neighboring primary iron core 21, the described elementary width of unshakable in one's determination 21 is greater than primary permanent magnet body 22 width along the arrangement of direction of motion equi-spaced apart to form elementary tooth 23 in the described Width both sides of elementary unshakable in one's determination 21, nestedly on described elementary tooth 23 is provided with armature winding 24.
The secondary salient pole 12 that described long secondary stator 1 comprises plate shaped secondary iron core 11 and equidistantly arranges at described plate shaped secondary iron core 11 inner surface, described secondary salient pole 12 is oppositely arranged with described elementary tooth 23.
Described primary permanent magnet body 22 magnetizes along described short elementary mover 2 direction of motion, and adjacent described primary permanent magnet body 22 magnetizing direction is contrary.
Embodiment 2,
One as described in Example 1 bilateral length used for oil extractor secondary primary permanent magnet type field modulation linear electric motors, its difference is, the number of one-sided described elementary tooth 23: N
p, armature winding 24 coiling number of pole-pairs: p
w, one-sided adjacent described elementary tooth 23 centre distance: τ
pwith the centre distance of adjacent described secondary salient pole 12: τ
s, meet following relational expression (I):
N
p·τ
p＝(N
p/2+p
w)·τ
s(I)
In formula (I), N
p=6k, k are positive integer; The block number of described primary permanent magnet body 22 is N
p+ 1.
Embodiment 3,
One as described in embodiment 1,2 bilateral length used for oil extractor secondary primary permanent magnet type field modulation linear electric motors, its difference is, is respectively arranged with balance gear 25 at described short elementary mover 2 along on primary permanent magnet body 22 end face at direction of motion two ends.
Embodiment 4,
One as described in Example 3 bilateral length used for oil extractor secondary primary permanent magnet type field modulation linear electric motors, its difference is, the width of described balance gear 25 is equal with the described elementary width of unshakable in one's determination 21.
Embodiment 5,
One as described in embodiment 1,2,3,4 bilateral length used for oil extractor secondary primary permanent magnet type field modulation linear electric motors, its difference is, the secondary salient pole 12 that described 2 plate shaped secondary iron core 11 inner surfaces are arranged respectively is arranged in alignment each other.
Embodiment 6,
One as described in embodiment 1,2,3,4 bilateral length used for oil extractor secondary primary permanent magnet type field modulation linear electric motors, its difference is, the secondary salient pole 12 that described 2 plate shaped secondary iron core 11 inner surfaces are arranged respectively each other in being crisscross arranged, staggered difference in size: the centre distance τ being not more than adjacent described secondary salient pole 12
s1/2nd.
Embodiment 7,
One as described in embodiment 1,2,3,4,5,6 bilateral length used for oil extractor secondary primary permanent magnet type field modulation linear electric motors, its difference is, the end face width of described secondary salient pole 12 accounts for the centre distance τ of adjacent described secondary salient pole 12
sratio be 0.4-0.6.
Embodiment 8,
One as described in embodiment 1,2,3,4,5,6,7 bilateral length used for oil extractor secondary primary permanent magnet type field modulation linear electric motors, its difference is, the width of described elementary tooth 23 is less than the width of secondary salient pole 12.
Principle of the present invention is as follows:
See Fig. 1, between long secondary stator 1 of the present invention and short elementary mover 2, air gap 3 is set, with ensure elementary can free movement.
In described elementary mover 2 elementary unshakable in one's determination 21 and primary permanent magnet body 22 be alternately arranged along the mover direction of motion, elementary 21 Width both sides unshakable in one's determination arrange the elementary tooth 23 of protrusion towards secondary stator direction, consider that magnetic circuit balances, elementary mover two ends primary permanent magnet body 22 end face also needs to arrange balance gear 25, therefore, the block number of primary permanent magnet body 22 is than the number many 1 of one-sided elementary tooth 23, and armature winding 24 adopts concentratred winding form to be wound on elementary tooth 23.
Described primary permanent magnet body 22 is made up of rare-earth Nd-Fe-B or other permanent magnetic material, and primary permanent magnet body 22 magnetizes along the mover direction of motion, and Neighboring primary permanent magnet 22 magnetizing direction is contrary.
Long secondary stator 1 of the present invention is by plate shaped secondary iron core 11 and somely equidistantly protrude from secondary iron core surface and secondary salient pole 12 towards primary side is formed, secondary salient pole 12 can be modulated primary magnetic field, in order to obtain good magnetic field modulation effect and higher pushing force density, the present invention also needs to be optimized design to the end face width of secondary salient pole 12, and the end face width of described secondary salient pole 12 accounts for the centre distance τ of adjacent described secondary salient pole 12
sratio be 0.4-0.6, meanwhile, the width of elementary tooth 23 is less than the width of secondary salient pole 12.
Described secondary iron core 11, secondary salient pole 12, elementary unshakable in one's determination 21, elementary tooth 23, balance gear 25 are made up of silicon steel laminations or other permeability magnetic material, with common permanent magnetic linear synchronous motor elementary, secondary iron core manufacturing process is identical.
Be different from existing long stator type permanent magnetic linear synchronous motor, linear electric motors of the present invention have employed primary permanent magnet type structure, be different from again existing long-stator primary permanent magnet linear motor, linear electric motors of the present invention work based on magnetic field modulation principle, so the bilateral length that the present invention proposes secondary primary permanent magnet type field modulation linear electric motors are essentially different with existing linear electric motors in theory analysis, Optimal Structure Designing, calculation of parameter etc.The air-gap permeance change that linear electric motors of the present invention are caused by secondary salient pole 12 and elementary tooth 23 is modulated the magnetic field that primary permanent magnet body 22 produces, thus makes secondary stator field pole logarithm no longer identical with primary permanent magnet field pole logarithm.Now, the number of pole-pairs of elementary armature winding 24 coiling is no longer identical with primary permanent magnet field pole logarithm, but the secondary stator field pole logarithm less with the number of pole-pairs that modulation produces is identical, i.e. the number N of the elementary tooth 23 that described short elementary mover is one-sided
p, armature winding 24 coiling number of pole-pairs p
w, the one-sided Neighboring primary tooth of short elementary mover centre distance τ
p, long secondary stator neighboring secondary salient pole centre distance τ
smeet following relation:
N
p·τ
p＝(N
p/2+p
w)·τ
s，(I)
See Fig. 1, shown linear electric motors are in elementary, secondary effective range, and monolateral secondary salient pole 12 number is 13, and the one-sided elementary number of teeth 23 of mover is 18, then the number of pole-pairs of armature winding 24 coiling is 4.
Due to the particularity of operation principle and structure, on linear electric motor primary tooth of the present invention, winding magnetic linkage is unipolarity magnetic linkage, so armature winding 24 all adopts concentratred winding form design, this winding method further simplify inserting-coil process, is convenient to the modularization processing carrying out elementary mover.In addition, in order to coiling three-phase symmetric winding can be gone out, except additional equilibrium tooth 25, the number N of the elementary tooth 23 that mover is one-sided
pshould meet:
N
p=6k, wherein, k is positive integer.Now, the block number of described primary permanent magnet body 22 is N
p+ 1.
Armature winding and permanent magnet are all placed in short elementary mover by the bilateral length secondary primary permanent magnet type field modulation linear electric motors that the present invention relates to, long secondary stator is only the salient pole slab construction be made up of permeability magnetic material, and realize energy converting between mechanical based on magnetic field modulation principle, have the advantages that structure is simple, reliability is high, cost is low, pushing force density is large.
The foregoing is only better embodiment of the present invention; protection scope of the present invention is not limited with above-mentioned execution mode; in every case those of ordinary skill in the art modify or change according to the equivalence that disclosed content is done, and all should include in the protection range recorded in claims.
Claims (10)
1. bilateral length used for oil extractor secondary primary permanent magnet type field modulation linear electric motors, it is characterized in that, these linear electric motors comprise 2 long secondary stators that symmetry is oppositely arranged, the air gap being arranged on the short elementary mover between described 2 long secondary stators and being arranged between described short elementary mover and described long secondary stator; Described short elementary mover comprises along the elementary iron core of direction of motion equi-spaced apart arrangement, embedding is arranged on the primary permanent magnet body between Neighboring primary iron core, the width of described elementary iron core is greater than primary permanent magnet body width to form elementary tooth in the Width both sides of described elementary iron core, nestedly on described elementary tooth is provided with armature winding.
2. one according to claim 1 bilateral length used for oil extractor secondary primary permanent magnet type field modulation linear electric motors, it is characterized in that, the secondary salient pole that described long secondary stator comprises plate shaped secondary iron core and equidistantly arranges at described plate shaped secondary iron core inner surface, described secondary salient pole and described elementary tooth are oppositely arranged.
3. one according to claim 2 bilateral length used for oil extractor secondary primary permanent magnet type field modulation linear electric motors, is characterized in that, the number of one-sided described elementary tooth: N
p, armature winding coiling number of pole-pairs: p
w, one-sided adjacent described elementary tooth centre distance: τ
pwith the centre distance of adjacent described secondary salient pole: τ
s, meet following relational expression (I):
N
p·τ
p＝(N
p/2+p
w)·τ
s(I)
In formula (I), N
p=6k, k are positive integer; The block number of described primary permanent magnet body is N
p+ 1.
4. one according to claim 1 bilateral length used for oil extractor secondary primary permanent magnet type field modulation linear electric motors, it is characterized in that, described primary permanent magnet body magnetizes along the described short elementary mover direction of motion, and adjacent described primary permanent magnet body magnetizing direction is contrary.
5. one according to claim 1 bilateral length used for oil extractor secondary primary permanent magnet type field modulation linear electric motors, is characterized in that, be respectively arranged with balance gear at described short elementary mover along on the primary permanent magnet body end face at direction of motion two ends.
6. one according to claim 5 bilateral length used for oil extractor secondary primary permanent magnet type field modulation linear electric motors, it is characterized in that, the width of described balance gear is equal with the width of described elementary iron core.
7. one according to claim 2 bilateral length used for oil extractor secondary primary permanent magnet type field modulation linear electric motors, it is characterized in that, the secondary salient pole that described 2 plate shaped secondary iron core inner surfaces are arranged respectively is arranged in alignment each other.
8. one according to claim 2 bilateral length used for oil extractor secondary primary permanent magnet type field modulation linear electric motors, it is characterized in that, the secondary salient pole that described 2 plate shaped secondary iron core inner surfaces are arranged respectively is each other in being crisscross arranged.
9. one according to claim 8 bilateral length used for oil extractor secondary primary permanent magnet type field modulation linear electric motors, it is characterized in that, the secondary salient pole that described 2 plate shaped secondary iron core inner surfaces are arranged respectively each other in being crisscross arranged, staggered difference in size: the centre distance τ being not more than adjacent described secondary salient pole
s1/2nd.
10. one according to claim 2 bilateral length used for oil extractor secondary primary permanent magnet type field modulation linear electric motors, it is characterized in that, described secondary salient pole end face width accounts for adjacent described secondary salient pole centre distance τ
sratio be 0.4-0.6; The width of described elementary tooth is less than the width of secondary salient pole.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510790264.6A CN105429423B (en) | 2015-11-17 | 2015-11-17 | Bilateral long secondary primary permanent magnet type field modulation linear electric motors used for oil extractor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510790264.6A CN105429423B (en) | 2015-11-17 | 2015-11-17 | Bilateral long secondary primary permanent magnet type field modulation linear electric motors used for oil extractor |
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Cited By (4)
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| CN105720784A (en) * | 2016-04-13 | 2016-06-29 | 邹宇 | Symmetric double-sided permanent magnet assisted linear switch reluctance motor |
| CN108900065A (en) * | 2018-08-31 | 2018-11-27 | 重庆大学 | A kind of Double-edge type permanent magnetism vernier linear motor |
| CN109391119A (en) * | 2018-11-01 | 2019-02-26 | 湖南高精特电装备有限公司 | A kind of bilateral line inductance electromotor with modular characteristics |
| CN113162365A (en) * | 2021-05-11 | 2021-07-23 | 沈阳工业大学 | Bilateral magnetic flux switching type magnetic suspension permanent magnet linear synchronous motor and control method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105720784A (en) * | 2016-04-13 | 2016-06-29 | 邹宇 | Symmetric double-sided permanent magnet assisted linear switch reluctance motor |
| CN108900065A (en) * | 2018-08-31 | 2018-11-27 | 重庆大学 | A kind of Double-edge type permanent magnetism vernier linear motor |
| CN109391119A (en) * | 2018-11-01 | 2019-02-26 | 湖南高精特电装备有限公司 | A kind of bilateral line inductance electromotor with modular characteristics |
| CN113162365A (en) * | 2021-05-11 | 2021-07-23 | 沈阳工业大学 | Bilateral magnetic flux switching type magnetic suspension permanent magnet linear synchronous motor and control method thereof |
| CN113162365B (en) * | 2021-05-11 | 2023-10-13 | 沈阳工业大学 | Double-sided magnetic flux switching type magnetic suspension permanent magnet linear synchronous motor and control method thereof |
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| CN105429423B (en) | 2016-11-23 |
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