CN201550013U - Permanent magnet eddy current coupling - Google Patents
Permanent magnet eddy current coupling Download PDFInfo
- Publication number
- CN201550013U CN201550013U CN2009202709661U CN200920270966U CN201550013U CN 201550013 U CN201550013 U CN 201550013U CN 2009202709661 U CN2009202709661 U CN 2009202709661U CN 200920270966 U CN200920270966 U CN 200920270966U CN 201550013 U CN201550013 U CN 201550013U
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- permanent
- permanent magnet
- eddy current
- magnet
- shaft coupling
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Abstract
The utility model relates to a permanent magnet eddy current coupling which comprises a conductive rotator installed on a driven shaft and a permanent magnet rotator installed on a driving shaft; wherein the conductive rotator comprises two circular driving plates fixedly installed on the driven shaft and mutually parallel, a circular conductor is fixedly installed on the opposite surfaces of the circular driving plates, the two circular driving plates are connected through a supporting plate, the driving plates and the supporting plate form a magnetic induction cavity, and the two opposite surfaces of the circular conductor are magnetic induction working surfaces; the permanent magnet rotator is positioned in the magnetic induction cavity and coaxial with the magnetic induction cavity, and comprises the driving shaft, two groups of magnetic drivers covered on the driving shaft, a permanent magnet mounting rack connected with the magnetic drivers and a permanent magnet positioned on the permanent magnet mounting rack; a permanent magnet is embedded on the same circumference as the surface of the mounting rack opposite to the conductor, and the magnetic pole faces of the permanent magnet are arranged into multi-stage magnetic rings at intervals of N-S-N. The permanent magnet eddy current coupling has the advantages that the structure is simple, the installation is convenient, and buffer starting and reversible full overload protection can be realized.
Description
Technical field
The utility model relates to a kind of shaft coupling, particularly a kind ofly the effect of driving shaft power by magnetic force can be passed to driven axle, thereby drives the asynchronous step rotation of driven axle, and can limit the permanent-magnet eddy current shaft coupling of maximum torque transfer capacity protection by working condition requirement.
Background technology
The widely used shaft coupling of mechanical field is mechanical coupling and fluid coupling at present, and wherein the mechanical coupling use amount accounts for more than 93%.Mechanical coupling is rigid connection, mechanical force transmitting torque.When shaft coupling is installed, exist the axial dipole field error will produce restoring force and moment on the one hand, thereby increased the load of proximity of devices parts (as axle, bearings); Exist on the other hand radially will produce alternate load, thereby cause the high-frequency vibration of equipment with the angle offset error; Rigid connection also makes prime mover start moment generation impact overload.In the shaft coupling that lost efficacy, the 90%th, because of vibrating fatigue causes, the 10%th, because of the impact overload causes.The temporary impact electric current of electric motor starting is a locked rotor current, generally is 4～7 times of its rated current; The transient current peak value of electric motor starting is with whether load starts irrelevant substantially; But load will prolong the duration (start-up time) of current peak when starting, motor is generated heat rapidly, influence the useful life of motor, even the danger of burning motor is arranged.For avoiding load to start the adverse consequences of bringing, the user increases the surplus rich amount of power as far as possible to motor coupling type selecting the time, make the phenomenon of " low load with strong power " in the electromechanical equipment more general, has wasted a large amount of energy.The overload protection function of machenical coupling also only limits under the limiting case, promptly guarantees the safety of prime mover and equipment in the mode of destructiveness sacrifice shaft coupling.
The utility model content
The purpose of this utility model be to overcome installation accuracy that machenical coupling exists require height, rigidity shock transfer, overload protection irreversible, start deficiencies such as impulsive force is big, provide a kind of and do not have the machinery link, can realize buffer starting, reversible overload protection, reduced the shaft coupling of installation accuracy requirement.
The technical solution of the utility model is: a kind of permanent-magnet eddy current shaft coupling, comprise the conduction rotary body that is loaded on the driven axle and the permanent magnetism rotary body on the driving shaft, described conduction rotary body comprises that two are installed in annular drive plate on the driven axle and that be parallel to each other, be fixed with annular electric conductor on the annular drive plate opposite face, connect by supporting bracket between two annular drive plates, described drive plate, supporting bracket form a magnetic induction chamber, and two opposite faces of annular electric conductor are the magnetic induction working face; Described permanent magnetism rotation position is in the magnetic induction chamber, and with the coaxial setting in magnetic induction chamber, the permanent magnetism rotary body comprises driving shaft, the permanent magnet installing rack that is set in two groups of magnetic driving bodies on the driving shaft, joins with the magnetic driving body and be positioned at permanent magnet on the permanent magnet installing rack, be embedded with permanent magnet on the same circumference of described installing rack and electric conductor opposite face, and the magnetic pole strength of permanent magnet becomes multistage magnet ring according to " N-S-N " sequence arrangement separately.
Preferably: described permanent magnet is fan-shaped.
Preferably: the annular drive plate of described conduction rotary body is the positive yoke of magnetic pole.
Preferably: the opposite face of described permanent magnet is provided with annular liner plate, and annular liner plate is the back side yoke of magnetic pole.
Preferably: limited square device is installed on the described annular liner plate, and described limit square device comprises base, kinetoplast and torsion spring, and when static, a kinetoplast is vertical with base under the effect of torsion spring.
Preferably: the annular drive plate of described conduction rotary body is installed on the driven axle by input axle sleeve and input swelling cover.
Preferably: the cross section of described driving shaft is a polygon, and driving shaft joins by output sleeve and output swelling cover and driving shaft.
Preferably: the outside of described drive plate is equipped with fin.
Preferably: described permanent magnet installing rack is an aluminium matter.
Preferably: described electric conductor is set to copper ring.
The beneficial effects of the utility model are: the utility model is simple in structure, simple installation, can realize buffer starting, reversible complete overload protection.
Description of drawings
Fig. 1 is the structural representation of the utility model shaft coupling
The conduction rotary body structural representation partly that Fig. 2 can be connected with driven axle for the utility model
The sectional structure schematic diagram of Fig. 3 Fig. 2 A-A
The structural representation of the permanent magnetism rotary body that Fig. 4 can be connected with driving shaft for the utility model
Fig. 5 be among the utility model Fig. 4 B to structural representation
Embodiment
Below in conjunction with description of drawings embodiment of the present utility model:
A kind of permanent-magnet eddy current shaft coupling, comprise the conduction rotary body that is loaded on the driven axle 1 and the permanent magnetism rotary body on the driving shaft 2, described conduction rotary body comprises that two are installed in annular drive plate 3 on the driven axle 1 and that be parallel to each other, be fixed with annular electric conductor 4 on annular drive plate 3 opposite faces, connect by supporting bracket 5 between two annular drive plates 3, described drive plate 3, supporting bracket 5 form a magnetic induction chamber 6, and two opposite faces of annular electric conductor 4 are the magnetic induction working face; Described permanent magnetism rotation position is in magnetic induction chamber 6, and with the 6 coaxial settings of magnetic induction chamber, the permanent magnetism rotary body comprises driving shaft 12, the permanent magnet installing rack 9 that is set in two groups of magnetic driving bodies 7 on the driving shaft 12, joins with magnetic driving body 7 and be positioned at permanent magnet 8 on the permanent magnet installing rack 9, be embedded with permanent magnet 8 on the same circumference of described installing rack 9 and electric conductor 4 opposite faces, and the magnetic pole strength of permanent magnet 8 becomes multistage magnet ring according to " N-S-N " sequence arrangement separately.Described permanent magnet 8 is fan-shaped.The annular drive plate 3 of described conduction rotary body is the positive yoke of magnetic pole.The opposite face of described permanent magnet 8 is provided with annular liner plate 16, and annular liner plate 16 is the back side yoke of magnetic pole.Limited square device is installed on the described annular liner plate 16, and described limit square device comprises base 17, kinetoplast 18 and torsion spring 19, and when static, a kinetoplast 18 is vertical with base 17 under the effect of torsion spring 19.The annular drive plate 3 of described conduction rotary body is installed on the driven axle 1 by input axle sleeve 10 and input swelling cover 11.The cross section of described driving shaft 12 is a polygon, and driving shaft 12 joins with driving shaft by output sleeve 13 and output swelling cover 14.The outside of described drive plate 3 is equipped with fin 15.Described permanent magnet installing rack 9 is an aluminium matter.Described electric conductor 4 is set to copper ring.
During work, permanent magnetism rotary body and conduction rotary body are respectively charged on driving shaft 1 and the driven axle 2, the spacing of adjusting between permanent magnet 8 pole-faces and the electric conductor 4 copper ring planes is " air gap ", be fixed on the axle separately by the keyless joint expansion set, this moment shaft coupling the master, Partner can relatively independently rotate, no any mechanical connection between the two, when existence relatively rotates between permanent magnetism rotary body and the conduction rotary body, multistage magnet ring on the conduction rotary body end face will induce a plurality of vortex flow rings on the copper ring surface, each vortex flow ring will induce a plurality of magnetic fields and interact with permanent magnetic fields at different levels of inducting again, conduction rotary body and permanent magnetism rotary body are asynchronous to rotate in the same way thereby order about, and realizes the transmission of torque.
The buffer starting process:
The permanent magnetism rotary body of the utility model shaft coupling connects, conducts electricity rotary body and connects with load with motor.Electrical power moment, the stator rotating magnetic field has reached synchronous speed at once, and rotor is static moving because of the effect of inertia force, so the relative rotation speed difference of two rotary bodies of shaft coupling is zero, and the load resistive torque that acts on rotor by shaft coupling also is zero.And the standard machinery shaft coupling, the resistive torque that act on motor shaft this moment equals the quiet resistive torque of load, and is slightly larger than the nominal torque of motor;
Along with the acceleration of rotor, its electromagnetic torque increases rapidly, and simultaneously the speed discrepancy of two rotary bodies of shaft coupling increases gradually and begins to transmit permanent-magnet torque and act on load; The permanent-magnet torque that transmits when shaft coupling is during greater than the quiet resistive torque of load, and load begins to start to be quickened, and the electromagnetic torque of rotor this moment is near its maximum and continue to quicken.The electromagnetic torque of rotor begins to reduce after reaching maximum, is equilibrated at rated operation point with load torque gradually, beginning stable operation, and start-up course finishes.
By said process as can be known, the essence of the utility model shaft coupling buffer starting is can postpone load torque in electric motor starting moment to act on rotor, enters steady-working state thereby motor can be started rapidly under underloading.
The mechanism of limit square device is as follows:
The utility model shaft coupling is when static state, and the gap between permanent magnet and the electric conductor is called initial air gap t
0Limit square device is made up of pedestal, a kinetoplast and torsion spring, the pedestal bottom surface installs and fixes the back side of a permanent magnetism rotor therein, prop up kinetoplast when static and under the torsion spring effect, be 90 ° of angles, be supported between two permanent magnetism rotors, and leave certain clearance h with the pedestal bottom surface.
When motor is loaded onto (being slightly larger than nominal torque) when limiting torque starting or cross during operation; Two permanent magnetism rotary bodies of the utility model shaft coupling can increase air gap to (t automatically when reaching the limit square speed discrepancy of setting
0+ h), the maximum permanent-magnet torque that transmits this moment is limited at and is slightly larger than nominal torque, and motor still can run well.
When motor operated in greater than limit square rotating speed, a kinetoplast of limit square device overcomes torsion spring power under centrifugal action and the pedestal bottom surface is about 30 ° of angle states; If the serious suddenly overload of load or stuck; load speed will be at moment bust or be zero-speed, and the speed discrepancy of shaft coupling also will increase in moment, and two permanent magnetism rotary bodies move automatic axial to be drawn close; air gap is increased to rapidly transmitting permanent-magnet torque is zero, and motor is protected fully.
After motor was shut down, two permanent magnetism rotary bodies automatically reset to initial air gap position; Limit square device props up kinetoplast and be 90 ° of angles with the pedestal bottom surface again under the torsion spring effect; Shaft coupling recovers the state that restarts automatically.
Claims (10)
1. permanent-magnet eddy current shaft coupling, comprise the conduction rotary body that is loaded on the driven axle and the permanent magnetism rotary body on the driving shaft, it is characterized in that: described conduction rotary body comprises that two are installed in annular drive plate on the driven axle and that be parallel to each other, be fixed with annular electric conductor on the annular drive plate opposite face, connect by supporting bracket between two annular drive plates, described drive plate, supporting bracket form a magnetic induction chamber, and two opposite faces of annular electric conductor are the magnetic induction working face; Described permanent magnetism rotation position is in the magnetic induction chamber, and with the coaxial setting in magnetic induction chamber, the permanent magnetism rotary body comprises driving shaft, the permanent magnet installing rack that is set in two groups of magnetic driving bodies on the driving shaft, joins with the magnetic driving body and be positioned at permanent magnet on the permanent magnet installing rack, be embedded with permanent magnet on the same circumference of described installing rack and electric conductor opposite face, and the magnetic pole strength of permanent magnet becomes multistage magnet ring according to " N-S-N " sequence arrangement separately.
2. permanent-magnet eddy current shaft coupling as claimed in claim 1 is characterized in that: described permanent magnet is fan-shaped.
3. permanent-magnet eddy current shaft coupling as claimed in claim 1 is characterized in that: the annular drive plate of described conduction rotary body is the positive yoke of magnetic pole.
4. permanent-magnet eddy current shaft coupling as claimed in claim 1 is characterized in that: the opposite face of described permanent magnet is provided with annular liner plate, and annular liner plate is the back side yoke of magnetic pole.
5. permanent-magnet eddy current shaft coupling as claimed in claim 4 is characterized in that: limited square device is installed on the described annular liner plate, and described limit square device comprises base, kinetoplast and torsion spring, and when static, a kinetoplast is vertical with base under the effect of torsion spring.
6. permanent-magnet eddy current shaft coupling as claimed in claim 1 is characterized in that: the annular drive plate of described conduction rotary body is installed on the driven axle by input axle sleeve and input swelling cover.
7. permanent-magnet eddy current shaft coupling as claimed in claim 1 is characterized in that: the cross section of described driving shaft is a polygon, and driving shaft joins by output sleeve and output swelling cover and driving shaft.
8. permanent-magnet eddy current shaft coupling as claimed in claim 1 is characterized in that: the outside of described drive plate is equipped with fin.
9. permanent-magnet eddy current shaft coupling as claimed in claim 1 is characterized in that: described permanent magnet installing rack is an aluminium matter.
10. permanent-magnet eddy current shaft coupling as claimed in claim 1 is characterized in that: described electric conductor is set to copper ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202709661U CN201550013U (en) | 2009-12-03 | 2009-12-03 | Permanent magnet eddy current coupling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202709661U CN201550013U (en) | 2009-12-03 | 2009-12-03 | Permanent magnet eddy current coupling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201550013U true CN201550013U (en) | 2010-08-11 |
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ID=42605196
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202709661U Expired - Fee Related CN201550013U (en) | 2009-12-03 | 2009-12-03 | Permanent magnet eddy current coupling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201550013U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102270918A (en) * | 2011-07-26 | 2011-12-07 | 融德（大连）机电工程设备有限公司 | Magnetic coupler with adjustable starting state gap |
| CN103326537A (en) * | 2013-06-19 | 2013-09-25 | 南京艾凌永磁调速技术研究有限公司 | Moment-limiting type permanent magnet coupler |
| CN103904859A (en) * | 2013-06-26 | 2014-07-02 | 上海市东方海事工程技术有限公司 | Efficient-heat-dissipation low-noise torque limited permanent magnetic coupling |
-
2009
- 2009-12-03 CN CN2009202709661U patent/CN201550013U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102270918A (en) * | 2011-07-26 | 2011-12-07 | 融德（大连）机电工程设备有限公司 | Magnetic coupler with adjustable starting state gap |
| CN103326537A (en) * | 2013-06-19 | 2013-09-25 | 南京艾凌永磁调速技术研究有限公司 | Moment-limiting type permanent magnet coupler |
| CN103326537B (en) * | 2013-06-19 | 2016-07-06 | 南京艾凌永磁调速技术研究有限公司 | Limited-moment permanent magnetic coupling |
| CN103904859A (en) * | 2013-06-26 | 2014-07-02 | 上海市东方海事工程技术有限公司 | Efficient-heat-dissipation low-noise torque limited permanent magnetic coupling |
| CN103904859B (en) * | 2013-06-26 | 2016-07-06 | 上海市东方海事工程技术有限公司 | High efficiency and heat radiation low noise distance-limiting type permanent magnet clutch |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100811 Termination date: 20111203 |