CN107800266A - A kind of permanent-magnet speed governor of fixed magnetic gap - Google Patents
A kind of permanent-magnet speed governor of fixed magnetic gap Download PDFInfo
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- CN107800266A CN107800266A CN201711060503.8A CN201711060503A CN107800266A CN 107800266 A CN107800266 A CN 107800266A CN 201711060503 A CN201711060503 A CN 201711060503A CN 107800266 A CN107800266 A CN 107800266A
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- 238000004804 winding Methods 0.000 claims abstract description 65
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000006243 chemical reaction Methods 0.000 claims abstract description 7
- 239000004065 semiconductor Substances 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 3
- 230000033228 biological regulation Effects 0.000 description 11
- 238000000034 method Methods 0.000 description 11
- 230000005611 electricity Effects 0.000 description 6
- 239000004020 conductor Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 230000010358 mechanical oscillation Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K49/00—Dynamo-electric clutches; Dynamo-electric brakes
- H02K49/02—Dynamo-electric clutches; Dynamo-electric brakes of the asynchronous induction type
- H02K49/04—Dynamo-electric clutches; Dynamo-electric brakes of the asynchronous induction type of the eddy-current hysteresis type
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K49/00—Dynamo-electric clutches; Dynamo-electric brakes
- H02K49/10—Dynamo-electric clutches; Dynamo-electric brakes of the permanent-magnet type
- H02K49/104—Magnetic couplings consisting of only two coaxial rotary elements, i.e. the driving element and the driven element
- H02K49/108—Magnetic couplings consisting of only two coaxial rotary elements, i.e. the driving element and the driven element with an axial air gap
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P15/00—Arrangements for controlling dynamo-electric brakes or clutches
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/14—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field
- H02P9/38—Self-excitation by current derived from rectification of both output voltage and output current of generator
Abstract
The present invention relates to a kind of permanent-magnet speed governor of fixed magnetic gap, including with inputting the rotor disk of axis connection, being arranged at the magnet rotor disk with exporting axis connection of rotor disk opposite and being arranged at the armature stator at the rotor disk back side；Rotor disk is included in winding coil B, the permanent magnet A that the inside and outside side of its excircle sets respectively and iron core between the two, magnet rotor disk is provided with permanent magnet B in its excircle medial surface, and armature stator includes fixed seat and the winding coil A along distribution on the inside of fixed seat periphery；The control system for electric energy conversion is connected between described winding coil B and winding coil A；Slip ring is installed on rotor disk.Present invention employs slip energy rectified feedback technology, quick boosting or braking are realized by winding coil A, make the fixation magnetic gap speed regulator speed governing rapid reaction, flexibly, stably, by slip energy rectified feedback booster action, it is achieved thereby that the maximization of speed efficiency.
Description
Technical field
The present invention relates to a kind of speed regulator, and in particular to a kind of permanent-magnet speed governor of fixed magnetic gap.
Background technology
Permanent-magnet speed governor is the magnetic couple speed governing by permanent magnet, realizes soft (magnetic) connection of motor and load, nothing
Any harmonic wave for influenceing power network produces, and reliability is high, and can high temperature, low temperature, humidity, dirt, inflammable and explosive, voltage instability and
Worked under the various adverse circumstances such as thunder and lightning, significantly mitigate mechanical oscillation, be widely used in electric power, steel, metallurgy, petrochemical industry, papermaking,
The industries such as municipal administration, naval vessel, irrigation and mining.And currently used permanent-magnet speed governor is to realize that rotating speed is adjusted by adjusting air gap
Whole, the power consumption of magnetic circuit adjuster is big, and has that torque-transfer capability is poor, assembly difficulty is high, wastes a large amount of rare earth resources
The shortcomings of.To solve the above problems, patent CN2015108084423 proposes a kind of permanent-magnet speed governor of fixed magnetic gap, from holding
The permanent-magnet speed governor for design that magnetic gap is constant, the quantity of the change magnetic line of force is started with, passes through the magnetic for controlling p-m rotor externally to show
Property size, so as to reach change torque purpose.But slippage be present between input, output, synchronization can not be realized, and slippage produces
Heat be consumed, torque transfer capability is relatively low.
The content of the invention
It can reduce magnetic circuit adjuster power consumption in view of the above-mentioned problems, the present invention provides one kind, improve torque-transfer capability
Fixation magnetic gap permanent-magnet speed governor.
Current permanent-magnet speed governor is all so as to controlling conductor by changing the air gap between conductor rotor and p-m rotor
Rotor cutting magnetic line number, to realize torque adjustment, because this mode has many drawbacks, the present invention is based on electromagnetism
Principle, caused slip energy between input, output is reused, so as to improve the transmission capacity of torque.
To solve the above problems, the technical scheme that the present invention takes is：A kind of permanent-magnet speed governor of fixed magnetic gap, including with
Input axis connection rotor disk, be arranged at magnet rotor disk opposite with export axis connection magnet rotor disk and be arranged at rotor
The armature stator at the disk back side；Described rotor disk is included in winding coil B, the permanent magnetism that the inside and outside side of its excircle is set respectively
Body A and iron core between the two, described magnet rotor disk in its excircle medial surface be provided with it is corresponding with winding coil B forever
Magnet B, described armature stator include fixed seat and along on the inside of fixed seat periphery distribution with permanent magnet A be correspondingly arranged around
Group loop A；The control system for electric energy conversion, described rotor are connected between described winding coil B and winding coil A
Slip ring is installed on disk.
The circumferentially distributed winding coil B of the medial surface of rotor disk, magnet rotor disk respectively at its disk periphery, permanent magnet B；Rotor
The circumferentially distributed permanent magnet A of lateral surface of the disk in its disk periphery, the medial surface of armature stator is circumferentially distributed have it is corresponding with permanent magnet A
The winding coil A of setting.
Speed regulator principle：Relative motion is produced when rotor disk rotates with magnet rotor disk, winding coil B cutting magnetic fields produce electricity
Stream, while electric current produces induced field and permanent magnetism field interactions again, it is final to drive magnet rotor disk edge and rotor disk identical side
To rotation, so as to drive the output shaft rotation being connected on magnet rotor disk and export power.Winding coil B connects through control system
To winding coil A, electric current caused by winding coil B is passed through electric current through control system to the winding coil A on armature stator, according to
Electromagnetic induction principle, electromagnetic force is produced in the permanent magnet A magnetic fields on rotor disk, the direction of electromagnetic force depends on winding coil A
Apply sense of current；When the direction of electromagnetic force and the identical direction of input shaft, boosting power i.e. driving force is shown as, it is now defeated
The input power for entering axle is approximately equal to the power output of output shaft (loss for ignoring armature resistance, control system and rotation system)；
Otherwise it is brake force, the input power of input shaft is more than the power output of output shaft.
Described control system includes being connected on the rectification module at coil windings B both ends, to be connected on rectification module output end positive and negative
Adjusting control circuit and three-phase inverter bridge circuit between pole；Three-phase inverter bridge circuit output end wiring circle winding A；Institute
The three-phase inverter bridge circuit stated includes six FETs；Described adjusting control circuit includes three Hall elements and a control
Coremaking piece；Power end, the earth terminal of three Hall elements are respectively connected to rectification module output head anode, negative pole, three Hall members
The output end of part is connected to control chip input, and control chip power supply terminates rectification module output head anode, control chip
Output end is connected on the grid of six FETs respectively, and the control terminal of control chip draws drive control line and control for brake respectively
Line, control chip are further connected with speed adjusting resistance.Control principle of the system based on typical brushless motor, rectification module are used for whole
Flow and prevent electric current reversely charging.
Utilize the speed regulation process of above-mentioned control system：Adjust speed adjusting resistance, when speed adjusting resistance is in 0 position of speed governing, winding
Driving current is 0 in coil B, is reacted to commutating circuit output current and is approximately equal to 0, is similarly reacted in winding coil A loops electric
Stream output is approximately equal to 0, and now input speed is rated speed, output speed 0；When speed adjusting resistance is in the full journey position of speed governing,
Driving current is maximum in winding coil B, is reacted to commutating circuit output current maximum, is similarly reacted to winding coil A loops
Middle electric current output is maximum, and now input power is approximately equal to power output, and input speed is approximately equal to output speed；Accelerate and run
When, just push away (driving) work；Braking operation when slowing down and shutting down.The process of regulation speed adjusting resistance is the speed governing of speed regulator
Journey.
Described control system includes the loop being made up of coil windings B, controllable conduction part, rectification module；Coil around
Group B both ends are parallel with speed adjusting resistance, and adjusting control circuit and three-phase bridge type inverse are connected between rectification module output positive and negative charge
Circuit；Three-phase inverter bridge circuit output end wiring circle winding A；Described three-phase inverter bridge circuit includes six field-effects
Pipe；Described adjusting control circuit includes three Hall elements and a control chip；Power end, the earth terminal of three Hall elements
Rectification module output head anode, negative pole are respectively connected to, the output end of three Hall elements is connected to control chip input, control
Chip power terminates rectification module output head anode, and the output end of control chip is connected on the grid of six FETs respectively, controls
The control terminal of coremaking piece draws drive control line and brake control lines respectively.Control of the system based on typical brushless motor
Principle, rectification module are used for rectification and prevent electric current reversely charging.
Utilize the speed regulation process of above-mentioned control system：Speed adjusting resistance is adjusted, it is controllable when speed adjusting resistance is in 0 position of speed governing
Conductive member is not turned on, and electric current is 0 in winding coil B, and it is 0 to be reacted to commutating circuit output current, electricity in winding coil A loops
Flow for 0, now input speed is rated speed, output speed 0；When speed adjusting resistance is in the full journey position of speed governing, controllable conduction
Part turns on entirely, and electric current is maximum in winding coil B, is reacted to commutating circuit output current as maximum, electricity in winding coil A loops
Flow for maximum, now input power is approximately equal to power output, and input speed is approximately equal to output speed；When accelerating and running, just push away
(driving) works；Braking operation when slowing down and shutting down.The process of regulation speed adjusting resistance is the speed regulation process of speed regulator.
Preferably, described control chip uses integrated chip MCC33035 or DSPIC30F2010 or IR2136.
Preferably, described controllable conduction part uses controllable silicon or metal-oxide-semiconductor.
Preferably, the fixed seat is made of iron core.
Input shaft, the position of output shaft can exchange.Rotor disk can connect output shaft, the connection of magnet rotor disk i.e. in the application
Input shaft.
The present invention as a result of slip energy rectified feedback technology, can be realized by winding coil A quick boosting or
Braking so that the fixation magnetic gap speed regulator speed governing rapid reaction, flexibly, stably, pass through slip energy rectified feedback boosting make
With it is achieved thereby that the maximization of speed efficiency, drastically increases energy-saving efficiency and energy-saving effect and service life is complete
Surmount frequency converter, belong to energy-efficient product, can be that user saves the great number of driving energy.
Brief description of the drawings
Fig. 1 is main sectional view of the present invention；
Fig. 2 is the left view of armature stator；
Fig. 3 is the control system schematic diagram of embodiment one；
Fig. 4 is the control system schematic diagram of embodiment two；
Wherein：1. fixed seat, 2. permanent magnet A, 3. input shafts, 4. winding coil A, 5. is unshakable in one's determination, and 6. winding coil B, 7. is defeated
Shaft, 8. permanent magnet B, 9. control systems.U1-U3 Hall elements, U4 control chips, VT1-VT6 FETs, R1 speed governing electricity
Resistance, UO2 controllable conduction parts.
Embodiment
Embodiment one
A kind of permanent-magnet speed governor of fixed magnetic gap, including be connected with input shaft 3 rotor disk, be arranged at rotor disk opposite
The magnet rotor disk being connected with output shaft 7 and the armature stator for being arranged at the rotor disk back side；Described rotor disk is included in it
Winding coil B6, permanent magnet A2 that the inside and outside side of excircle is set respectively and iron core 5 between the two, described magnet rotor
Disk is provided with permanent magnet B8 corresponding with winding coil B6 in its excircle medial surface, and described armature stator includes fixed seat 1
And the winding coil A4 being correspondingly arranged with permanent magnet A2 along distribution on the inside of the periphery of fixed seat 1；Described winding coil B6 with
The control system 9 for electric energy conversion is connected between winding coil A4, slip ring is installed on described rotor disk.
Described control system 9 includes being connected on the rectification module at coil windings B6 both ends, is connected on rectification module and exports and rectify
Adjusting control circuit and three-phase inverter bridge circuit between negative pole；Three-phase inverter bridge circuit output end wiring circle winding
A4；Described three-phase inverter bridge circuit includes six FET VT1-VT6；Described adjusting control circuit includes three suddenly
That element
A U1-U3 and control chip U4；Three Hall element U1-U3 power end, earth terminal is respectively connected to rectification module
Output head anode, negative pole, three Hall element U1-U3 output end are connected to control chip U4 inputs, control chip U4 electricity
Source connects rectification module output head anode, and control chip U4 output end is connected on six FET VT1-VT6 grid respectively,
Control chip U4 control terminal draws drive control line and brake control lines respectively, and control chip U4 is further connected with speed adjusting resistance R1.
Preferably, described control chip U4 uses integrated circuit MCC33035 or DSPIC30F2010 or IR2136.
Speed regulation process：Speed adjusting resistance R1 is adjusted, when speed adjusting resistance R1 is in 0 position of speed governing, electricity is driven in winding coil B6
Flow for 0, be reacted to commutating circuit output current and be approximately equal to 0, be similarly reacted to electric current output in winding coil A4 loops and be approximately equal to
0, now input speed is rated speed, output speed 0；When speed adjusting resistance R1 is in the full journey position of speed governing, winding coil B6
Middle driving current is maximum, is reacted to commutating circuit output current maximum, it is defeated to be similarly reacted to electric current in winding coil A4 loops
Go out maximum, now input power is approximately equal to power output, and input speed is approximately equal to output speed；When accelerating and running, just push away and (drive
It is dynamic) work；Braking operation when slowing down and shutting down.Regulation speed adjusting resistance R1 process is the speed regulation process of speed regulator.
Embodiment two
A kind of permanent-magnet speed governor of fixed magnetic gap, including be connected with input shaft 3 rotor disk, be arranged at rotor disk opposite
The magnet rotor disk being connected with output shaft 7 and the armature stator for being arranged at the rotor disk back side；Described rotor disk is included in it
Winding coil B6, permanent magnet A2 that the inside and outside side of excircle is set respectively and iron core 5 between the two, described magnet rotor
Disk is provided with permanent magnet B8 corresponding with winding coil B6 in its excircle medial surface, and described armature stator includes fixed seat 1
And the winding coil A4 being correspondingly arranged with permanent magnet A2 along distribution on the inside of the periphery of fixed seat 1；Described winding coil B6 with
The control system 9 for electric energy conversion is connected between winding coil A4, slip ring is installed on described rotor disk.
Described control system 9 includes the loop being made up of coil windings B6, controllable conduction part UO2, rectification module；Line
Circle winding B6 both ends are parallel with speed adjusting resistance R1, and adjusting control circuit and three-phase bridge are connected between rectification module output positive and negative charge
Formula inverter circuit；Three-phase inverter bridge circuit output end wiring circle winding A4；Described three-phase inverter bridge circuit includes six
FET VT1-VT6；Described adjusting control circuit includes a three Hall element U1-U3 and control chip U4；Three suddenly
Your element U1-U3 power end, earth terminal is respectively connected to rectification module output head anode, negative pole, three Hall element U1-U3's
Output end is connected to control chip U4 inputs, control chip U4 power supplys termination rectification module output head anode, control chip U4
Output end be connected on six FET VT1-VT6 grid respectively, control chip U4 control terminal draws drive control respectively
Line and brake control lines.
Preferably, described control chip U4 uses integrated circuit MCC33035 or DSPIC30F2010 or IR2136.
Preferably, described controllable conduction part UO2 uses controllable silicon or metal-oxide-semiconductor.
Speed regulation process：Speed adjusting resistance R1 is adjusted, when speed adjusting resistance R1 is in 0 position of speed governing, controllable conduction part U02 is not led
Logical, electric current is 0 in winding coil B6, and it is 0 to be reacted to commutating circuit output current, and electric current is 0 in winding coil A4 loops, now
Input speed is rated speed, output speed 0；When speed adjusting resistance R1 is in the full journey position of speed governing, controllable conduction part U02 is complete
Turn on, electric current is maximum in winding coil B6, is reacted to commutating circuit output current as maximum, electric current is in winding coil A4 loops
Maximum, now input power be approximately equal to power output, input speed is approximately equal to output speed；When accelerating and running, just push away and (drive
It is dynamic) work；Braking operation when slowing down and shutting down.Regulation speed adjusting resistance R1 process is the speed regulation process of speed regulator.
Claims (6)
- A kind of 1. permanent-magnet speed governor of fixed magnetic gap, it is characterised in that：Including be connected with input shaft (3) rotor disk, be arranged at The magnet rotor disk being connected with output shaft (7) of rotor disk opposite and the armature stator for being arranged at the rotor disk back side；Described Rotor disk is included in winding coil B (6), permanent magnet A (2) that the inside and outside side of its excircle sets respectively and between the two Iron core (5), described magnet rotor disk are provided with permanent magnet B (8) corresponding with winding coil B (6), institute in its excircle medial surface The armature stator stated includes fixed seat (1) and is correspondingly arranged along distribution on the inside of fixed seat (1) periphery with permanent magnet A (2) Winding coil A (4)；The control system for electric energy conversion is connected between described winding coil B (6) and winding coil A (4) (9)；Slip ring is installed on described rotor disk.
- 2. the permanent-magnet speed governor of fixed magnetic gap according to claim 1, it is characterised in that：Described control system includes connecing Rectification module at coil windings B (6) both ends, the adjusting control circuit and three being connected between rectification module output positive and negative charge Phase bridge inverter main circuit；Three-phase inverter bridge circuit output end wiring circle winding A (4)；Described three-phase inverter bridge circuit bag Include six FETs (VT1-VT6)；Described adjusting control circuit includes three Hall elements (U1-U3) and a control chip (U4)；Power end, the earth terminal of three Hall elements (U1-U3) are respectively connected to rectification module output head anode, negative pole, and three suddenly The output end of your element (U1-U3) is connected to control chip (U4) input, and control chip (U4) power supply termination rectification module is defeated Go out proper pole, the output end of control chip (U4) is connected on the grid of six FETs (VT1-VT6), control chip (U4) respectively Control terminal draw drive control line and brake control lines respectively, control chip (U4) is further connected with speed adjusting resistance (R1).
- 3. the permanent-magnet speed governor of fixed magnetic gap according to claim 1, it is characterised in that：Described control system include by The loop that coil windings B (6), controllable conduction part (UO2), rectification module are formed；Coil windings B (6) both ends are parallel with speed governing Resistance (R1), adjusting control circuit and three-phase inverter bridge circuit are connected between rectification module output positive and negative charge；Three-phase bridge Inverter circuit output end wiring circle winding A (4)；Described three-phase inverter bridge circuit includes six FETs (VT1-VT6)； Described adjusting control circuit includes three Hall elements (U1-U3) and a control chip (U4)；Three Hall elements (U1-U3) Power end, earth terminal be respectively connected to rectification module output head anode, negative pole, the output end of three Hall elements (U1-U3) is equal Control chip (U4) input is connected to, control chip (U4) power supply terminates rectification module output head anode, control chip (U4) Output end is connected on the grid of six FETs (VT1-VT6) respectively, and the control terminal of control chip (U4) draws driving control respectively Line and brake control lines processed.
- 4. the permanent-magnet speed governor of the fixation magnetic gap according to Claims 2 or 3, it is characterised in that：Described control chip (U4) MCC33035 or DSPIC30F2010 or IR2136 is used.
- 5. the permanent-magnet speed governor of fixed magnetic gap according to claim 3, it is characterised in that：Described controllable conduction part (UO2) controllable silicon or metal-oxide-semiconductor are used.
- 6. the permanent-magnet speed governor of fixed magnetic gap according to claim 1, it is characterised in that：The fixed seat (1) uses iron Core (5) is made.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711060503.8A CN107800266A (en) | 2017-11-01 | 2017-11-01 | A kind of permanent-magnet speed governor of fixed magnetic gap |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711060503.8A CN107800266A (en) | 2017-11-01 | 2017-11-01 | A kind of permanent-magnet speed governor of fixed magnetic gap |
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| CN107800266A true CN107800266A (en) | 2018-03-13 |
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| CN201711060503.8A Pending CN107800266A (en) | 2017-11-01 | 2017-11-01 | A kind of permanent-magnet speed governor of fixed magnetic gap |
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| CN103248197A (en) * | 2013-05-29 | 2013-08-14 | 江苏理工学院 | Magnetorheological fluid power coupler |
| CN103312118A (en) * | 2013-06-14 | 2013-09-18 | 宝鸡泰华磁机电技术研究所有限公司 | Internal radiation ring type simple permanent magnet coupling |
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| CN105048910A (en) * | 2015-07-09 | 2015-11-11 | 国家电网公司 | Sensorless high-voltage cascaded frequency converter vector control system and control method thereof |
| CN105006951A (en) * | 2015-08-06 | 2015-10-28 | 江苏磁谷科技股份有限公司 | Magnetic coupling transmission device running at constant power and adjustable speed |
| CN106685282A (en) * | 2015-11-05 | 2017-05-17 | 广东美的生活电器制造有限公司 | Electric appliance and motor speed regulating device thereof |
| CN105471339A (en) * | 2015-12-31 | 2016-04-06 | 易事特集团股份有限公司 | Asynchronous starting device of brushless doubly-fed machine |
| CN205960930U (en) * | 2016-08-23 | 2017-02-15 | 贾建伟 | Multi -functional transmission of permanent magnetism |
| CN106911244A (en) * | 2017-04-20 | 2017-06-30 | 大连交通大学 | Permanent magnet speed regulation device based on electric current adjusting type |
| CN107248804A (en) * | 2017-07-20 | 2017-10-13 | 江苏磁谷科技股份有限公司 | A kind of desk permanent-magnet coupling mechanism and apply its device |
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