CN104467358A - Permanent magnet eddy current brake device - Google Patents
Permanent magnet eddy current brake device Download PDFInfo
- Publication number
- CN104467358A CN104467358A CN201410675449.8A CN201410675449A CN104467358A CN 104467358 A CN104467358 A CN 104467358A CN 201410675449 A CN201410675449 A CN 201410675449A CN 104467358 A CN104467358 A CN 104467358A
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- permanent magnet
- seamless
- metal pipe
- nonmagnetic metal
- brake device
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- Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
Abstract
The invention belongs to the technical field of electromagnetic braking devices and relates to a permanent magnet eddy current brake device. Braking is carried out through the utilization of reverse eddy current braking force of a permanent magnet reciprocating in a seamless non-magnetic metal tube. The device comprises the seamless non-magnetic metal tube, the permanent magnet, a permanent magnet support, a connection rod and a flywheel, the permanent magnet is installed on the support, the support is connected with the flywheel through the connection rod, the permanent magnet does not make surface contact with the seamless non-magnetic metal tube, and the permanent magnet reciprocates in the seamless non-magnetic metal tube. The permanent magnet eddy current brake device is simple and compact in structure and simple in daily maintenance and can be used in serial connection, and radiators can be installed conveniently.
Description
Technical field
The invention belongs to electro-magnetic braking device technical field, particularly relate to a kind of Permanent magnet eddy-current brake device, utilize the reverse eddy current braking power in seamless nonmagnetic metal pipe suffered by reciprocating permanent magnet to brake.
Background technology
Brake apparatus is one of guarantee of mechanized equipment safe operation, and it not only has influence on the quality of mechanized equipment performance, and is directly connected to the security of the lives and property of operating personnel.Moreover, braking ability also directly affects the operational efficiency of mechanized equipment.Therefore, good braking ability plays an important role with increasing economic efficiency to guarantee equipment safety operation.Eddy current braking is a kind of braking model with good characteristic.
Different according to excitation mode, eddy current braking can be divided into electromagnetic eddy current braking and Permanent magnet eddy-current brake, electromagnetic eddy current braking adopts the high magnetic permeability iron core (or other materials) being wound around multiturn coil winding as magnetic pole, utilizing external power source to provide electric current for coil windings, providing magnetic field for producing eddy current braking.Permanent magnet eddy-current brake utilizes high-performance permanent magnet to produce magnetic field, can by carrying out the size of controlled vortex flow braking force to physical dimension design.Compared with electromagnetic eddy current braking, without the need to additional excitation, therefore there is not the danger of brake fade during power-off, have higher reliability in Permanent magnet eddy-current brake.
Different with sensor conductor structural shape according to magnet, eddy current braking can be divided into again linear eddy-current brake and rotating vortex braking.When linear eddy-current brake device is arranged on bogie, it mainly comprises electromagnet, transmission rod, suspension arrangement etc.When needs are braked, the electromagnet after energising and sensor conductor produce relative motion, and sensor conductor induces eddy current, thus form braking force.Rotating vortex brake apparatus is that magnet is arranged on metal dish side using the metal dish that is arranged on axletree as sensor conductor.When motor train unit application linear eddy-current brake device is braked, suspension arrangement makes electromagnet drop to low level, and the magnetic field produced after electromagnet energising induces eddy current in rail, reaches braking object.When motor train unit application rotating vortex device is braked, the metal dish of rotation can induce eddy current in magnetic field, thus forms braking force.
Eddy current braking device has good characteristic, but still there are some problems.The subject matter that linear eddy-current brake device exists is that sensor conductor is longer, is not easy to install heat abstractor; Simultaneously under the application scenario of track traffic, electromagnetic field easily produces electromagnetic interference to track circuit.Rotating vortex brake device structure is complicated, and equipment regular maintenance is comparatively difficult, and is not easy to parallel combination use.
Summary of the invention
The present invention is intended to the above-mentioned deficiency overcoming prior art, and provide a kind of simple and compact for structure, regular maintenance is simple, is convenient to install heat abstractor, can the contactless brake apparatus used in parallel.
In order to realize above object, the present invention by the following technical solutions:
A kind of Permanent magnet eddy-current brake device, it is characterized in that, this device comprises seamless nonmagnetic metal pipe, permanent magnet, permanent magnet support, connecting rod, flywheel, permanent magnet is rack-mount, support is connected with flywheel by connecting rod, and there is not surface contact between permanent magnet and seamless nonmagnetic metal pipe, permanent magnet moves reciprocatingly in seamless nonmagnetic metal pipe.
Preferably, described seamless nonmagnetic metal tubing matter should not contain magnetic impurity and tube wall is completely closed, does not have gap, and be provided with heat abstractor on metal tube; The pole orientation of described permanent magnet is parallel with the axis of seamless nonmagnetic metal pipe, and the maximum gauge of permanent magnet should be less than the minimum diameter of seamless nonmagnetic metal pipe; Described permanent magnet support material should select nonmagnetic substance.
Beneficial effect of the present invention is as follows:
(1) brake device structure of the present invention is compact, can realize lightweight, miniaturization, is applicable to multiple mechanized equipment.Permanent magnet moves reciprocatingly in nonmagnetic metal pipe, therefore sensor conductor length is short, effectively saves the material of sensor conductor.
(2) brake apparatus of the present invention is contactless eddy current braking device, seamless nonmagnetic metal pipe does not contact with between permanent magnet surfaces, therefore there is not friction, avoid the life problems of wearing and tearing and contact fatigue generation, be convenient to regular maintenance, and brake dust and noise pollution can not be produced, energy-conserving and environment-protective.
(3) brake apparatus of the present invention is without the need to excitation, can improve service efficiency and stock utilization, there is not the danger of brake fade during power-off, and braking procedure is steady.
(4) in brake apparatus of the present invention, energy dissipation mechanism is seamless nonmagnetic metal pipe, is convenient to install heat abstractor, effectively can avoid the problem of temperature rise produced in braking procedure.
Accompanying drawing explanation
Fig. 1 is a kind of overall structure schematic diagram of Permanent magnet eddy-current brake device;
Fig. 2 is a kind of structure cutaway view of Permanent magnet eddy-current brake device;
Fig. 3 is a kind of three-dimensional right-handed rectangular coordinate system of cylindrical permanent magnet;
Fig. 4 is the schematic diagram producing eddy current in nonmagnetic metal pipe;
Fig. 5 is electromagnetic force schematic diagram suffered by permanent magnet;
Fig. 6 is a kind of running under braking schematic diagram of Permanent magnet eddy-current brake device;
Embodiment
In order to make the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention will be further described.
The present invention relates to a kind of brake apparatus based on permanent magnet reciprocating motion generation electromagnetic force in seamless nonmagnetic metal pipe, as shown in Figure 1, be a kind of preferred forms of the present invention, Fig. 2 be this device section structure vertically 1/4th cut open after structural representation, comprise seamless nonmagnetic metal pipe 1, fin 2, permanent magnet 3, permanent magnet support 4, connecting rod 5, output shaft 6, flywheel 7, flywheel fixture 8.Wherein, permanent magnet 3, in seamless nonmagnetic metal pipe 1, by being connected with output shaft 6 after the connection of permanent magnet support 4, connecting rod 5, flywheel 7, thus forms the overall structure of eddy current braking device.
In the present embodiment, nonmagnetic metal pipe adopts cylindrical seamless metal pipe, and radiator adopts nature air swept type fin, and permanent magnet shape is cylindrical, and its mode of magnetizing is that axial uniform parallel magnetizes.Permanent magnet moves reciprocatingly in metal tube, and its symmetry axis overlaps with seamless nonmagnetic metal pipe symmetry axis.
As shown in Figure 3, with the center of cylindrical permanent magnet for initial point, permanent magnet N extreme direction is z-axis positive direction, sets up three-dimensional right-handed rectangular coordinate system.In the present embodiment, permanent magnet shape is cylindrical, and magnetizes for axial uniform parallel, and therefore permanent magnet magnetic induction does not exist tangential component, only there is radial component B
rwith z-axis component B
z, the magnetic induction density B at a some P place can be expressed as (B in space
rcos θ, B
rsin θ, B
z), wherein θ is the projection of OP in XOY plane and the angle of x-axis.When permanent magnet 3 moves along z-axis negative direction, the speed of seamless nonmagnetic metal pipe 1 relative magnetic field is that (0,0, v), then in the closed-loop path that seamless nonmagnetic metal pipe 1 is formed, producing motional electromotive force is
Because magnetic field of permanent magnet and seamless nonmagnetic metal pipe 1 all have symmetry, the vertical cross-section crossing symmetry axis chosen as shown in Figure 4 carries out electromagnetic induction analysis, two-dimentional cartesian coordinate system is set up in cross section, Fig. 4 gives the direction of permanent magnet magnetic induction radial component in vertical cross-section, and in seamless nonmagnetic metal pipe 1, the direction of eddy current is determined by Lenz's law.For any point P (x, z) in seamless nonmagnetic metal pipe 1 cross section, the cell area of its correspondence is dS, and the thickness of vertical cross-section is the magnetic flux density radial component of dl, P point is B
r(x, z), then the induced electromotive force of this point is
dε＝B
r(x,z)vdl (2)
Induced electromotive force direction is perpendicular to XOZ plane.For this cell area dS, its resistance is
In a current density at P (x, z) place be then
When permanent magnet 3 moves vertically in seamless nonmagnetic metal pipe 1, magnetic field of permanent magnet can go out eddy current at seamless nonmagnetic metal pipe 1 internal induction, eddy current in seamless nonmagnetic metal pipe 1 will induce magnetic field, and interact with magnetic field of permanent magnet, and then produce the electromagnetic force hindering relative motion between permanent magnet 3 and seamless nonmagnetic metal pipe 1.
According to Ampere force law, magnetic field of permanent magnet z-axis component B suffered by current element J (x, the z) dSdl that P (x, z) puts
zactive force be
Wherein cross section orthogonal shown in the direction of dl and Fig. 4, seamless nonmagnetic metal pipe 1 is subject to magnetic field of permanent magnet z-axis component B
zmake a concerted effort be
Wherein Sa is the Perpendicular cross section area of seamless nonmagnetic metal pipe, due to
Therefore, seamless nonmagnetic metal pipe 1 is subject to magnetic field of permanent magnet z-axis component B
zto make a concerted effort be zero.In like manner can obtain magnetic field of permanent magnet radial component B suffered by current element
ractive force be
Seamless nonmagnetic metal pipe 1 is subject to magnetic field of permanent magnet radial component B
rmake a concerted effort be
Judged by left hand rule, seamless nonmagnetic metal pipe 1 is subject to magnetic field of permanent magnet radial component B
rmake a concerted effort along z-axis negative direction, then the electromagnetic force that is subject to of seamless nonmagnetic metal pipe 1
In formula, k is z-axis unit vector, from Newton's third law, and eddy current magnetism directed force F suffered by permanent magnet 3
ealong z-axis positive direction, its size is equal with F, and direction is contrary, as shown in Figure 5.In like manner known, when permanent magnet 3 moves along z-axis positive direction, the active force that permanent magnet 3 is subject to eddy current is contrary with permanent magnet 3 movement velocity direction, and this active force plays a part to hinder permanent magnet 3 to move.
When needs are braked, brake apparatus designed by the present invention is cut into transmission mechanism, output shaft 6 flywheel driven 7 is rotated, by connecting rod 5, permanent magnet 3 is moved reciprocatingly in seamless nonmagnetic metal pipe 1 vertically, magnetic field of permanent magnet can go out eddy current at seamless nonmagnetic metal pipe 1 internal induction, the magnetic field that now seamless nonmagnetic metal pipe 1 internal vortex produces can produce active force to permanent magnet 3, hinder the relative motion of permanent magnet 3 and seamless nonmagnetic metal pipe 1, form the brake torque to flywheel 7 and output shaft 6, thus realize contactless eddy current braking.Its carrying out practically process as shown in Figure 6, suppose that flywheel rotates in the counterclockwise direction, when device is in state shown in Fig. 6 (a), permanent magnet 3 direction of motion changes, it is subject to braking force direction and also changes simultaneously, along with flywheel rotates, plant running is to state as Suo Shi Fig. 6 (b), now permanent magnet 3 is to left movement, it by braking force to the right, when plant running is to state Fig. 6 (c) Suo Shi, permanent magnet 3 direction of motion and braking force direction suffered by it change again simultaneously, and then when moving to state shown in Fig. 6 (d), permanent magnet 3 moves right, it by braking force left, until again run to state shown in Fig. 6 (a), permanent magnet 3 repeats above-mentioned motion process in seamless nonmagnetic metal pipe 1.In addition, by changing the quantity of seamless nonmagnetic metal pipe in parallel, then can regulate seamless nonmagnetic metal pipe internal vortex magnetic field produce the power of electromagnetic force, thus realize the adjustment of braking force size.
Needs further illustrate, specific embodiment of the invention method is extensive, the embodiment that this place is done only elaborates effect, only have chosen a kind of preferred case study on implementation to analyze, in actual use, some details can change to some extent, comprise combination and the assembly of parts, these distortion and application all should belong to scope of the present invention.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. a Permanent magnet eddy-current brake device, it is characterized in that, this device comprises seamless nonmagnetic metal pipe, permanent magnet, permanent magnet support, connecting rod, flywheel, permanent magnet is rack-mount, support is connected with flywheel by connecting rod, and there is not surface contact between permanent magnet and seamless nonmagnetic metal pipe, permanent magnet moves reciprocatingly in seamless nonmagnetic metal pipe.
2. a kind of Permanent magnet eddy-current brake device according to claim 1, is characterized in that, described seamless nonmagnetic metal tubing matter should not contain magnetic impurity and tube wall is completely closed, does not have gap, and be provided with heat abstractor on seamless nonmagnetic metal pipe.
3. a kind of Permanent magnet eddy-current brake device according to claim 1, is characterized in that, the pole orientation of described permanent magnet is parallel with the axis of seamless nonmagnetic metal pipe, and the maximum gauge of permanent magnet should be less than the minimum diameter of seamless nonmagnetic metal pipe.
4. a kind of Permanent magnet eddy-current brake device according to claim 1, is characterized in that, described permanent magnet support material should select nonmagnetic substance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410675449.8A CN104467358A (en) | 2014-11-21 | 2014-11-21 | Permanent magnet eddy current brake device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410675449.8A CN104467358A (en) | 2014-11-21 | 2014-11-21 | Permanent magnet eddy current brake device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104467358A true CN104467358A (en) | 2015-03-25 |
Family
ID=52912890
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410675449.8A Pending CN104467358A (en) | 2014-11-21 | 2014-11-21 | Permanent magnet eddy current brake device |
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| CN (1) | CN104467358A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110011257A (en) * | 2019-04-17 | 2019-07-12 | 刘奉海 | A kind of torsion electromagnetic damping anti-dance device |
| CN111249670A (en) * | 2020-03-11 | 2020-06-09 | 永康市华格工业产品设计有限公司 | Internal heat dissipation mechanism of bicycle flywheel and control method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2133986Y (en) * | 1991-12-12 | 1993-05-19 | 冯建光 | Forward and backward current driver |
| CA2415841A1 (en) * | 2000-07-17 | 2002-01-24 | Magnetar Technologies Ltd. | Eddy current brake system with dual use conductor fin |
| CN101594100A (en) * | 2008-06-01 | 2009-12-02 | 吴元 | Ferromagnetic engine |
| CN202856473U (en) * | 2012-07-20 | 2013-04-03 | 林贵生 | Stepless convertible torque and speed adjustable direct drive electromotor or generator |
-
2014
- 2014-11-21 CN CN201410675449.8A patent/CN104467358A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2133986Y (en) * | 1991-12-12 | 1993-05-19 | 冯建光 | Forward and backward current driver |
| CA2415841A1 (en) * | 2000-07-17 | 2002-01-24 | Magnetar Technologies Ltd. | Eddy current brake system with dual use conductor fin |
| CN101594100A (en) * | 2008-06-01 | 2009-12-02 | 吴元 | Ferromagnetic engine |
| CN202856473U (en) * | 2012-07-20 | 2013-04-03 | 林贵生 | Stepless convertible torque and speed adjustable direct drive electromotor or generator |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110011257A (en) * | 2019-04-17 | 2019-07-12 | 刘奉海 | A kind of torsion electromagnetic damping anti-dance device |
| CN111249670A (en) * | 2020-03-11 | 2020-06-09 | 永康市华格工业产品设计有限公司 | Internal heat dissipation mechanism of bicycle flywheel and control method thereof |
| CN111249670B (en) * | 2020-03-11 | 2021-05-07 | 永康市华格工业产品设计有限公司 | Internal heat dissipation mechanism of bicycle flywheel and control method thereof |
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Application publication date: 20150325 |