CN104767339A - Excitation adjustable type permanent magnet synchronous motor - Google Patents

Excitation adjustable type permanent magnet synchronous motor Download PDF

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Publication number
CN104767339A
CN104767339A CN201510152062.9A CN201510152062A CN104767339A CN 104767339 A CN104767339 A CN 104767339A CN 201510152062 A CN201510152062 A CN 201510152062A CN 104767339 A CN104767339 A CN 104767339A
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CN
China
Prior art keywords
permanent magnet
tooth bar
magnet synchronous
excitation
rotor
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CN201510152062.9A
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CN104767339B (en
Inventor
常成
宋传学
宋世欣
李少坤
肖峰
王达
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Jilin University
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Jilin University
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/02—Details
    • H02K21/021—Means for mechanical adjustment of the excitation flux
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)

Abstract

The invention discloses an excitation adjustable type permanent magnet synchronous motor. The excitation adjustable type permanent magnet synchronous motor comprises a rotor, the rotor comprises a plurality of paired permanent magnet assemblies, and each permanent magnet assembly comprises a cylindrical permanent magnet, a cover plate and a rotary driving mechanism. Parallel magnetization is adopted in the cylindrical permanent magnets, and the cylindrical permanent magnets are closely arranged in parallel. The appearances of the cover plates are of a cuboid structure, the cover plates are made of permeability magnetic materials, and the cylindrical permanent magnets are arranged in the cover plates to form the cuboid-shaped permanent magnets. The rotary driving mechanisms are connected with the cylindrical permanent magnets, and when the rotor rotates, the cylindrical permanent magnets are driven to rotate around the axes of themselves so that the magnetic flux of the permanent magnet assemblies can be reduced. The rotor structure of a traditional permanent magnet synchronous motor is changed, magnetic poles of the permanent magnets are pulled by an electromagnet in the motor to rotate, the excitation magnetic flux can be adjusted by itself, and therefore large demagnetizing current components do not need to be applied at high speed, and motor efficiency is improved.

Description

A kind of excitation adjustable permanent-magnet synchronous machine
Technical field
The present invention relates to permagnetic synchronous motor technical field, particularly a kind of excitation adjustable permanent-magnet synchronous machine.
Background technology
Permagnetic synchronous motor passes into three-phase current in the stator winding of motor, rotating magnetic field will be formed in the stator winding of motor after passing into electric current, owing to having installed permanent magnet on rotor, the magnetic pole of permanent magnet is fixing, according to the same-sex attraction opposite sex repulsion principle of magnetic pole, the rotating magnetic field produced in the stator can rotate by rotor driven, and the rotary speed finally reaching rotor is equal with the rotating speed of the rotary pole produced in stator.Permagnetic synchronous motor is usually used as the drive unit of electric automobile.
Permagnetic synchronous motor phase voltage u sshould ensure to be no more than voltage limiting value u lim:
u s 2＝u d 2+u q 2≤u lim 2
Above formula can be expressed as: (L qi q) 2+ (L di d+ ψ f) 2≤ (u lim/ ω e) 2
Wherein, u sfor phase voltage, u dfor d shaft voltage component, u qfor q axle shaft voltage component, u limfor limiting voltage, L dfor d axle inductance, L qfor q axle inductance, ψ ffor the magnetic linkage that permanent magnet produces, ω efor rotating speed.
As can be seen from the formula of above-mentioned permagnetic synchronous motor ac-dc axis Mathematical Modeling, when motor speed improves, phase voltage can be caused to improve, for ensureing that phase voltage is no more than extreme voltage values, there are two kinds of methods: motor d axle demagnetizing current component 1, can be increased, make d armature axis react L di dwith permanent magnet flux linkage Ψ fdirection is contrary, thus makes both add and reduce, and namely reaches the object of weak magnetic speedup.2, can reduce the size of excitation flux linkage, but in traditional permagnetic synchronous motor, the magnetic flux that permanent magnet sends is changeless, therefore the method cannot realize.
Because permagnetic synchronous motor is different from electric excitation synchronous motor, when reaching the limit values for electric excitation synchronous motor input voltage, for making motor can rotate at higher rotating speed, just need the exciting current reducing motor.And the excitation magnetic kinetic potential of permagnetic synchronous motor is produced by permanent magnet, therefore cannot the size of its value of self-regulation.In PMSM Speed process, when carrying out weak magnetics detect higher than needing during certain rotating speed, when maintaining High Rotation Speed, back electromotive force and input voltage balance each other.The principle of weak magnetics detect is when improving motor speed, by regulating the demagnetizing current component of stator d-axis, maintains balance of voltage during high-speed cruising.But this method makes the electric current of stator increase.And due in traditional permagnetic synchronous motor, permanent magnet magnetic conductance is less, make d-axis inductance also less, therefore when weak magnetics detect, need larger demagnetizing current, reduce the efficiency of motor.In addition, excessive demagnetizing current also can bring the danger of permanent magnet loss of excitation.In sum, if permanent magnet synchronous electric function is as electric excitation synchronous motor, the size of magnetic flux can be controlled voluntarily, just can simplify control method, and effectively raise the efficiency.
Summary of the invention
The present invention has designed and developed a kind of excitation adjustable permanent-magnet synchronous machine, object is that the existing permanent-magnetism synchronous motor permanent magnetic body excitation of solution is constant, during High Rotation Speed, the problem that demagnetizing current carrys out ME for maintenance balance must be applied, a kind of structure that can reduce the permagnetic synchronous motor of excitation field is voluntarily provided.
A further object of the invention is to provide a kind of excitation adjustable permanent-magnet synchronous machine, there is the slide rheostat regulating resistance with rotating speed voluntarily, its resistance and slide displacement are non-linear relation, demand can provide the resistance of corresponding size, to reach the effect changing magnetic flux by demand.
Technical scheme provided by the invention is:
A kind of excitation adjustable permanent-magnet synchronous machine, comprise rotor, described rotor comprises some permanent magnet assemblies arranged in pairs, and described permanent magnet assembly comprises:
Cylinder permanent magnet, it adopts parallel magnetization, described multiple cylinder permanent magnet close parallel arrangement;
Cover plate, its profile is rectangular structure, and described cover plate is made up of permeability magnetic material, and described cylinder permanent magnet is placed in described cover plate, to form rectangular-shaped permanent magnet;
Rotary drive mechanism, it is connected with described cylinder permanent magnet, when described rotor rotates, drives described cylinder permanent magnet to rotate around himself axis, reduces to make the magnetic flux of described permanent magnet assembly.
Preferably, in described permanent magnet assembly, the cylinder permanent magnet of close parallel arrangement is even number.
Preferably, described rotary drive mechanism comprises:
Gear, it is coaxially fixedly connected with described cylinder permanent magnet;
Tooth bar, it is meshed with described gear, drives described gear to rotate;
Driver, it is connected with described tooth bar, drives described tooth bar to move, and rotates around its axis to realize described cylinder permanent magnet.
Preferably, described driver comprises:
Direct drive type electro magnet, it comprises electromagnetic core and armature, and described armature is fixedly connected with described tooth bar, and described electromagnetic core is wound with solenoid, and after energising, described electromagnetic core can produce electromagnetic force, attracts described armature, thus drives described tooth bar to move;
Back-moving spring, it is connected with described tooth bar, drives described tooth bar to reset after described electromagnetic force disappears.
Preferably, described driver comprises:
Driven wheel, it engages with described tooth bar;
Oscillating electromagnetic iron, it comprises electromagnetic core and armature, described armature is coaxially connected with described driven wheel rotation, described electromagnetic core is wound with solenoid, after energising, described electromagnetic core can produce electromagnetic force, attract described armature rotate and then drive described driven wheel to rotate, realize the movement of described tooth bar;
Back-moving spring, it is connected with described driven wheel, drives described driven wheel to reset after described electromagnetic force disappears.
Preferably, described solenoid is connected with slide rheostat, described slide rheostat rotates with described rotor, and described slide rheostat has slidably to be held, and described slidably end is connected with resistance spring, described slidably end constantly can slide laterally with the increase of rotor speed, and compress described resistance spring, the resistance of described slide rheostat is reduced, and then increases the electric current in described solenoid, increase electromagnetic force, thus increase the anglec of rotation of described cylinder permanent magnet.
Preferably, in described slide rheostat resistance value R and place in circuit, the length x of resistance has following relation:
R = A F 1 + k 1 { R d · arccos [ B · m ( R z + L - x ) F 0 + k 0 ( L - x ) ] } · 1 L - x
Wherein, A, B are constant, F 1for back-moving spring precompression, k 1for back-moving spring stiffness factor, F 0for resistance spring precompression, k 0for resistance spring stiffness factor, m is the quality of slidably holding, R zfor slidably holding the distance apart from electrical axis time initial, R dfor described gear compound graduation radius of circle, L is slide rheostat resistance wire total length.
Preferably, under the driving of described rotary drive mechanism, the direction of rotation of described adjacent two cylinder permanent magnets is contrary, to reduce the wearing and tearing between adjacent two cylinder permanent magnets.
Preferably, the rotatable angle of described cylinder permanent magnet is 0-45 °.
A kind of electric automobile, by above-mentioned excitation adjustable permanent-magnet synchronous machine drives.
Excitation adjustable permanent-magnet synchronous machine beneficial effect of the present invention is: the present invention is by changing traditional permanent-magnetic synchronous motor rotor structure, permanent magnet pole is made to pull rotation by electromagnet in motor, realization can regulate excitation magnetic flux voluntarily, thus without the need to when high speed, apply larger demagnetizing current component, improve electric efficiency, and the magnetic flux of rotor permanent magnet can need and corresponding change according to rotating speed.Meanwhile, also prevent demagnetizing current excessive time permanent magnet loss of excitation danger, and simple to operate, be conducive to controlling.
Accompanying drawing explanation
Fig. 1 is excitation adjustable permanent-magnet synchronous machine general structure schematic diagram of the present invention.
Fig. 2 is permanent magnet assembly structural representation of the present invention.
Fig. 3 is the magnetic flux schematic diagram that permanent magnet assembly initial condition of the present invention is passed through.
Fig. 4 is the magnetic flux schematic diagram passed through after permanent magnet assembly of the present invention changes excitation.
Fig. 5 is drive schematic diagram of the present invention.
Fig. 6 is driver general structure schematic diagram of the present invention.
Fig. 7 is transmission device schematic diagram in another execution mode of driver of the present invention.
Fig. 8 is slide rheostat structural representation of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail, can implement according to this with reference to specification word to make those skilled in the art.
As shown in Figure 1, the invention provides a kind of excitation adjustable permanent-magnet synchronous machine, comprise housing 1, be positioned at stator 2 and the rotor 3 of housing 1.Be air gap between stator 2 internal circular surfaces and rotor 3 outer round surface, stator 2 is made up of stator core and stator winding.Described rotor 3 comprises rotor core 4, motor shaft 5 and permanent magnet assembly arranged in pairs 6.Motor shaft 5 be one by every the metal through shaft of magnetic.Permanent magnet assembly 6 is placed in the through slot on rotor core 4, and permanent magnet assembly 6 forms regular polygon in the end of rotor 3, and regular polygon center is on the center line of rotor 3.Permanent magnet assembly is set to 2n, and wherein have the N pole of n permanent magnet assembly 6 to be outside vertical sensing, the N pole of n permanent magnet assembly 6 vertically points to inner side in addition, and permanent magnet assembly 6 is arranged in the through slot of the rectangle of rotor core 4.According to the difference of each permanent magnet assembly polarity, being arranged in the rectangle through slot of rotor core 4 of interval successively.
Consult Fig. 2 in the lump, described permanent magnet assembly 6 comprises cylinder permanent magnet 610, cover plate 620 and rotary drive mechanism 630.Described cylinder permanent magnet 610 adopts parallel magnetization, the close parallel arrangement from top to bottom of multiple cylinder permanent magnet, seamless between them.Cover plate 620 is in rectangular structure, and it is made up of permeability magnetic material, and described cylinder permanent magnet 610 is placed in described cover plate 620, is provided with the cavity holding cylinder permanent magnet 610, leaves the air gap of 0.1mm between cylinder permanent magnet 610 and cover plate 620 in cover plate 620.At the end at each cylindrical permanent magnet body 610 two ends, a sliding bearing is housed, by the bearing shell of this sliding bearing, each cylindrical permanent magnet 610 is arranged in cover plate 620.The material of the sliding bearing at each cylindrical permanent magnet 610 two ends is every magnetic metal material.Described rotary drive mechanism 630 is connected with described cylinder permanent magnet 610, when described rotor 3 rotates, drives described cylinder permanent magnet 610 to rotate around himself axis, reduces to make the magnetic flux of described permanent magnet assembly.By this layout, for improve rotating speed need to reduce magnetic flux time, make cylinder permanent magnet 610 rotate certain angle, the magnetic flux in originally direction will be reduced, and add the counter magnetic flux amount of equivalent, achieve the object of weak magnetic, as shown in Fig. 3 Fig. 4.
In another embodiment, in described permanent magnet assembly, the cylinder permanent magnet 610 of close parallel arrangement is even number.
As shown in Fig. 5 Fig. 6, in such scheme, rotary drive mechanism 630 comprises gear 631, tooth bar 632 and driver.Wherein, gear 631 is connected to the end face of cylinder permanent magnet 610, and coaxial with cylinder permanent magnet 610.Tooth bar 632 engages with shown gear 631.The both sides being arranged on cylinder permanent magnet 610 at described gear 631 interval, namely in compact arranged cylinder permanent magnet 610, on the left of the cylinder permanent magnet 610 being positioned at odd positions, gear 631 is installed, and the right left side of cylinder permanent magnet 610 being positioned at even number position is provided with gear 631.Described tooth bar 632 is provided with two, lays respectively at the left and right sides of cylinder permanent magnet 610, engages with the gear 631 of both sides.Driver is connected with described tooth bar 632, and described tooth bar 632 can be driven to move, and rotates around himself axis to realize described cylinder permanent magnet 610.The moving direction of driver drives two tooth bars 632 is contrary, to make the direction of rotation of adjacent two cylinder permanent magnets 610 contrary, thus reduces the wearing and tearing between adjacent two cylinder permanent magnets 610.
In embodiment at another, described driver comprises direct drive type electro magnet, it comprises electromagnetic core 641 and armature 642, described armature 642 is fixedly connected with described tooth bar 632, described electromagnetic core 641 is wound with solenoid 643, after energising, described electromagnetic core 641 can produce electromagnetic force, attracts described armature 642, thus drives described tooth bar 632 to move.Described driver also comprises back-moving spring 644, and it is connected with described tooth bar 632, drives described tooth bar to reset, the magnetic flux of described permanent magnet combination body is restPosed after described electromagnetic force disappears.Described driver is provided with two, drives two tooth bars 632 in same permanent magnet assembly 6 to move in the opposite direction.
As shown in Figure 7, in another embodiment, described driver comprises driven wheel 645, oscillating electromagnetic iron and back-moving spring 644.Driven wheel 645 engages with described tooth bar 632; Oscillating electromagnetic iron comprises electromagnetic core and armature, described armature is coaxially connected with described driven wheel rotation, described electromagnetic core is wound with solenoid 643, after energising, described electromagnetic core can produce electromagnetic force, attract described armature rotate and then drive described driven wheel 645 to rotate, realize the movement of described tooth bar 632; Back-moving spring 644 is connected with described driven wheel 645, drives described driven wheel to reset after described electromagnetic force disappears.
In another embodiment, a series connection slide rheostat 7 on described solenoid 643, described slide rheostat 7 rotates with described rotor, described slide rheostat 7 has slidably holds 701,701 are slidably held to be connected with resistance spring 702, under the effect of resistance spring 701, slidably hold 701 to be pulled to the maximum end of slide rheostat resistance, the distance of now slidably holding 701 distance electrical axis is R z, along with the increase of motor speed, slidably hold 701 can slide laterally under the influence of centrifugal force, and compression resistance spring 702.Because resistance spring 702 has an initial precompression F 0, slidably hold 701 can not slide laterally when that is the rotary speed of motor is very little, only have the initial precompression F that ought slidably hold the centripetal force of 701 to be greater than resistance spring 702 0time, slidably hold 701 just can slide laterally, namely the rotational speed omega of motor need meet following relation
ω > F 0 m R z ,
Wherein m be slidably hold 701 quality.
Along with the increase of motor speed, 701 are slidably held constantly to move laterally, resistance length in place in circuit is constantly reduced, and then resistance value also constantly reduces, the electric current flow through in solenoid 643 is constantly increased, electromagnet suction is directly proportional to electric current again, and then electromagnetic attraction increases, and makes tooth bar 632 produce displacement.
Electromagnet suction F dmeet following relation
F d＝F 1+k 1R dθ，
Wherein, F 1for back-moving spring precompression, k 1for back-moving spring stiffness factor, R dfor described gear compound graduation radius of circle, θ is the angle that cylinder permanent magnet 610 rotates.
And after cylinder permanent magnet 610 rotates θ angle, by the magnetic flux of permanent magnet assembly 6 be
φ＝BScosθ
Wherein B is magnetic field intensity, and S is permanent magnet assembly front face area.
As can be seen here after cylinder permanent magnet 610 rotates θ angle, can be reduced by the magnetic flux of permanent magnet assembly 6, thus reduce the effect of back electromotive force, can further improve the rotating speed of motor.Along with the continuous increase of rotating speed, θ angle also needs to increase to reduce more magnetic flux thereupon.
The relation of the length x of resistance in slide rheostat resistance value R and place in circuit can be expressed as:
R = A F 1 + k 1 { R d · arccos [ B · m ( R z + L - x ) F 0 + k 0 ( L - x ) ] } · 1 L - x
Wherein, A, B are constant, F 1for back-moving spring precompression, k 1for back-moving spring stiffness factor, F 0for resistance spring precompression, k 0for resistance spring stiffness factor, R zfor slidably holding the distance apart from electrical axis time initial, R dfor described gear compound graduation radius of circle, L is slide rheostat resistance wire total length.
In above formula, constant A is Euler's numbers, i.e. A=e=2.71828, constant B=0.5.
Preferred as one, the rotatable angle of described cylinder permanent magnet 610 is 0-45 °.
Although embodiment of the present invention are open as above, but it is not restricted to listed in specification and execution mode utilization, it can be applied to various applicable the field of the invention completely, for those skilled in the art, can easily realize other amendment, therefore do not deviating under the universal that claim and equivalency range limit, the present invention is not limited to specific details and illustrates here and the legend described.

Claims (10)

1. an excitation adjustable permanent-magnet synchronous machine, comprises rotor, and described rotor comprises some permanent magnet assemblies arranged in pairs, it is characterized in that, described permanent magnet assembly comprises:
Cylinder permanent magnet, it adopts parallel magnetization, described multiple cylinder permanent magnet close parallel arrangement;
Cover plate, its profile is rectangular structure, and described cover plate is made up of permeability magnetic material, and described cylinder permanent magnet is placed in described cover plate, to form rectangular-shaped permanent magnet;
Rotary drive mechanism, it is connected with described cylinder permanent magnet, when described rotor rotates, drives described cylinder permanent magnet to rotate around himself axis, reduces to make the magnetic flux of described permanent magnet assembly.
2. excitation adjustable permanent-magnet synchronous machine according to claim 1, is characterized in that, in described permanent magnet assembly, the cylinder permanent magnet of close parallel arrangement is even number.
3. excitation adjustable permanent-magnet synchronous machine according to claim 1 and 2, it is characterized in that, described rotary drive mechanism comprises:
Gear, it is coaxially fixedly connected with described cylinder permanent magnet;
Tooth bar, it is meshed with described gear, drives described gear to rotate;
Driver, it is connected with described tooth bar, drives described tooth bar to move, and rotates around its axis to realize described cylinder permanent magnet.
4. excitation adjustable permanent-magnet synchronous machine according to claim 3, it is characterized in that, described driver comprises:
Direct drive type electro magnet, it comprises electromagnetic core and armature, and described armature is fixedly connected with described tooth bar, and described electromagnetic core is wound with solenoid, and after energising, described electromagnetic core can produce electromagnetic force, attracts described armature, thus drives described tooth bar to move;
Back-moving spring, it is connected with described tooth bar, drives described tooth bar to reset after described electromagnetic force disappears.
5. excitation adjustable permanent-magnet synchronous machine according to claim 3, it is characterized in that, described driver comprises:
Driven wheel, it engages with described tooth bar;
Oscillating electromagnetic iron, it comprises electromagnetic core and armature, described armature is coaxially connected with described driven wheel rotation, described electromagnetic core is wound with solenoid, after energising, described electromagnetic core can produce electromagnetic force, attract described armature rotate and then drive described driven wheel to rotate, realize the movement of described tooth bar;
Back-moving spring, it is connected with described driven wheel, drives described driven wheel to reset after described electromagnetic force disappears.
6. the excitation adjustable permanent-magnet synchronous machine according to claim 4 or 5, it is characterized in that, described solenoid is connected with slide rheostat, described slide rheostat rotates with described rotor, described slide rheostat has slidably to be held, described slidably end is connected with resistance spring, described slidably end constantly can slide laterally with the increase of rotor speed, and compress described resistance spring, the resistance of described slide rheostat is reduced, and then the electric current increased in described solenoid, increase electromagnetic force, thus increase the anglec of rotation of described cylinder permanent magnet.
7. excitation adjustable permanent-magnet synchronous machine according to claim 6, is characterized in that, in described slide rheostat resistance value R and place in circuit, the length x of resistance has following relation:
R = A F 1 + k 1 { R d · arccos [ B · m ( R z + L - x ) F 0 + k 0 ( L - x ) ] } · 1 L - x
Wherein, A, B are constant, F 1for back-moving spring precompression, k 1for back-moving spring stiffness factor, F 0for resistance spring precompression, k 0for resistance spring stiffness factor, R zfor slidably holding the distance apart from electrical axis time initial, R dfor described gear compound graduation radius of circle, L is slide rheostat resistance wire total length.
8. the excitation adjustable permanent-magnet synchronous machine according to claim 4 or 5, is characterized in that, under the driving of described rotary drive mechanism, the direction of rotation of described adjacent two cylinder permanent magnets is contrary, to reduce the wearing and tearing between adjacent two cylinder permanent magnets.
9. the excitation adjustable permanent-magnet synchronous machine according to claim 6 or 7, is characterized in that, the rotatable angle of described cylinder permanent magnet is 0-45 °.
10. an electric automobile, is characterized in that, uses excitation adjustable permanent-magnet synchronous machine drives as claimed in any one of claims 1-9 wherein.
CN201510152062.9A 2015-04-01 2015-04-01 A kind of excitation adjustable permanent-magnet synchronous machine Expired - Fee Related CN104767339B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108702074A (en) * 2016-06-21 2018-10-23 勃姆巴迪尔运输有限公司 Motor
CN112044497A (en) * 2020-08-26 2020-12-08 杭州揽廉科技有限公司 Rice mill capable of improving rice milling rate and avoiding over-grinding
DE102020120821A1 (en) 2020-08-06 2022-02-10 Schaeffler Technologies AG & Co. KG Electric motor with rotatable permanent magnet element in the mounting hole

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102055257A (en) * 2009-10-30 2011-05-11 路易斯·J·芬克尔 Electric motor and/or generator with mechanically tuneable permanent magnetic field
CN202334225U (en) * 2011-12-05 2012-07-11 三门峡速达交通节能科技有限公司 Special high-speed permanent magnet synchronous driving motor for electric automobiles
CN204517612U (en) * 2015-04-01 2015-07-29 吉林大学 A kind of excitation adjustable permanent-magnet synchronous machine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102055257A (en) * 2009-10-30 2011-05-11 路易斯·J·芬克尔 Electric motor and/or generator with mechanically tuneable permanent magnetic field
CN202334225U (en) * 2011-12-05 2012-07-11 三门峡速达交通节能科技有限公司 Special high-speed permanent magnet synchronous driving motor for electric automobiles
CN204517612U (en) * 2015-04-01 2015-07-29 吉林大学 A kind of excitation adjustable permanent-magnet synchronous machine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108702074A (en) * 2016-06-21 2018-10-23 勃姆巴迪尔运输有限公司 Motor
CN108702074B (en) * 2016-06-21 2021-02-09 勃姆巴迪尔运输有限公司 Electric machine
DE102020120821A1 (en) 2020-08-06 2022-02-10 Schaeffler Technologies AG & Co. KG Electric motor with rotatable permanent magnet element in the mounting hole
CN112044497A (en) * 2020-08-26 2020-12-08 杭州揽廉科技有限公司 Rice mill capable of improving rice milling rate and avoiding over-grinding

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