CN110212735B - Wide-speed-range rotating eddy current brake based on self-adaptive adjustment of rotating speed - Google Patents

Wide-speed-range rotating eddy current brake based on self-adaptive adjustment of rotating speed Download PDF

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CN110212735B
CN110212735B CN201910518637.2A CN201910518637A CN110212735B CN 110212735 B CN110212735 B CN 110212735B CN 201910518637 A CN201910518637 A CN 201910518637A CN 110212735 B CN110212735 B CN 110212735B
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conductor ring
permanent magnet
speed
conductor
primary
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CN110212735A (en
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金银锡
谭立国
潘东华
邹志龙
孙芝茵
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Harbin Institute of Technology
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Harbin Institute of Technology
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L7/00—Electrodynamic brake systems for vehicles in general
    • B60L7/28—Eddy-current braking
    • 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
    • H02K49/046—Dynamo-electric clutches; Dynamo-electric brakes of the asynchronous induction type of the eddy-current hysteresis type with an axial airgap
    • 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)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)

Abstract

The invention provides a wide-speed-range rotating eddy current brake based on self-adaptive adjustment of rotating speed, and belongs to the field of motors. According to the invention, a permanent magnet and a pressure spring are connected together and are arranged in a rectangular groove on a primary adapter plate, and a primary back iron is connected with the primary adapter plate and is coaxial with the primary adapter plate; the No. 1 conductor ring, the No. 2 conductor ring, the No. 3 conductor ring and the No. 4 conductor ring are made of conductors made of different materials, the electrical conductivity is gradually reduced from inside to outside, and the No. 1 conductor ring, the No. 2 conductor ring, the No. 3 conductor ring and the No. 4 conductor ring are tightly attached together and coaxial in pairs; the secondary portion is connected to the primary portion and the secondary portion is coaxial with the primary portion. The wide-speed-range rotating eddy current brake provided by the invention can automatically adjust the position of the permanent magnet along with the change of the rotating speed so as to enable the permanent magnet to correspond to conductor rings made of different materials in a secondary conductor plate, thereby obtaining excellent braking performance in a wide speed range.

Description

Wide-speed-range rotating eddy current brake based on self-adaptive adjustment of rotating speed
Technical Field
The invention relates to a rotary eddy current brake which can be applied to the application fields of large-scale bus braking, eddy current transmission and the like, and belongs to the technical field of motors.
Background
When any conductor and a constant magnetic field generate relative motion, eddy current is induced in the conductor and interacts with the constant magnetic field to generate braking force (damping force). An eddy current brake (electromagnetic damper) is an electromagnetic device based on the above principle, and can be applied to various industrial application fields, such as braking, vibration damping, transmission devices, and the like. The braking force generated by the eddy current brake is increased and then decreased along with the increase of the relative speed of the conductor and the magnetic field, and an optimal speed range (speed range) exists so that the braking performance of the eddy current brake can be kept high, as shown in figure 1. When the eddy current brake is used as a brake unit of a large passenger car, the requirement that the passenger car guarantees good brake performance at any speed is required, and the requirement is not only a certain limited speed range, so that the wide-speed-range eddy current brake needs to be researched.
Disclosure of Invention
The invention aims to solve the problems in the prior art and further provides a wide-speed-range rotating eddy-current brake based on rotation speed self-adaptive adjustment.
The purpose of the invention is realized by the following technical scheme:
a wide-speed-range rotating eddy current brake based on rotation speed self-adaptive adjustment comprises a primary part and a secondary part, wherein the primary part comprises a primary back iron, a primary adapter plate, a pressure spring and a permanent magnet; the secondary part comprises a No. 1 conductor ring, a No. 2 conductor ring, a No. 3 conductor ring and a No. 4 conductor ring, the No. 1 conductor ring, the No. 2 conductor ring, the No. 3 conductor ring and the No. 4 conductor ring are made of conductors made of different materials, the conductivity is gradually reduced from inside to outside, and the No. 1 conductor ring, the No. 2 conductor ring, the No. 3 conductor ring and the No. 4 conductor ring are tightly attached together and coaxial in pairs; the secondary portion is connected to the primary portion and the secondary portion is coaxial with the primary portion.
The invention relates to a wide-speed-range rotating eddy current brake based on rotation speed self-adaptive adjustment, wherein a secondary part comprises a No. 1 conductor ring, a No. 2 conductor ring, a No. 3 conductor ring, a No. 4 conductor ring or an n conductor ring.
The invention relates to a wide-speed-range rotating eddy current brake based on rotation speed self-adaptive adjustment, wherein a primary part comprises a secondary back iron, a No. 1 conductor ring, a No. 2 conductor ring, a No. 3 conductor ring, a No. 4 conductor ring or an n conductor ring.
The invention relates to a wide-speed-range rotating eddy current brake based on self-adaptive adjustment of rotating speed.
The invention relates to a wide-speed-range rotating eddy current brake based on self-adaptive adjustment of rotating speed.
The invention relates to a wide-speed-range rotating eddy current brake based on self-adaptive adjustment of rotating speed.
The invention relates to a wide-speed-range rotating eddy current brake based on self-adaptive adjustment of rotating speed.
The invention relates to a wide-speed-range rotating eddy current brake based on rotation speed self-adaptive adjustment, wherein the radiuses of contact boundaries among conductor rings are respectively set as R1、R2And R3In order to obtain a large braking torque in a wide speed range of the eddy-current brake, R is set as follows1、R2And R3I.e. when the speed reaches n1While the center position of the permanent magnet is aligned with R1(ii) a When the rotating speed reaches n2While the center position of the permanent magnet is aligned with R2(ii) a When the rotating speed reaches n3The center position of the permanent magnet is aligned with R3；
The forces to which the permanent magnets are subjected including centrifugal force FcSpring repulsive force FkAnd gravity FgThe formulas are respectively shown as formulas (1), (2) and (3)
Figure BDA0002095879140000021
In the formula, m is the mass of the permanent magnet, r is the radius of the center of the permanent magnet, and n is the rotating speed of the rotor;
Fk＝kx (2)
in the formula, k is the stiffness coefficient of the spring, and x is the deformation of the spring;
Fg＝mg (3)
when the permanent magnets are right above and right below the center of the rotor, the resultant force F is appliedupAnd FdownAre respectively as
Fup＝Fc-Fk-F (4)
Fdown＝Fc-Fk+F (5)
In order to eliminate the influence of gravity on the position of the permanent magnet to the maximum extent, the rotating speed is ensured to be more than or equal to n1When coming offThe cardiac acceleration being much greater than the gravitational acceleration, i.e.
Figure BDA0002095879140000031
In the formula, R0Is the initial position of the permanent magnet;
to satisfy when the rotating speed reaches n1While the center position of the permanent magnet is aligned with R1(ii) a When the rotating speed reaches n2While the center position of the permanent magnet is aligned with R2(ii) a When the rotating speed reaches n3The center position of the permanent magnet is aligned with R3The following equations are listed:
Figure BDA0002095879140000032
Figure BDA0002095879140000033
Figure BDA0002095879140000034
in equations (7), (8) and (9), the mass m and the rotational speed n of the permanent magnet1、n2And n3Spring stiffness coefficient k, permanent magnet initial position R0R can be given according to requirements by solving a linear equation system1、R2And R3。
The invention discloses a wide-speed-range rotating eddy current brake based on self-adaptive adjustment of rotating speed, and provides a wide-speed-range rotating eddy current brake based on self-adaptive adjustment of rotating speed, which utilizes the mutual balance action of centrifugal force and spring force to realize the self-adaptive change of the position of a primary permanent magnet along with the rotating speed so as to align the primary permanent magnet with different secondary conductors, realize different speed ranges and ensure that the eddy current brake has good braking performance; the wide-speed-range rotating eddy current brake provided by the invention can automatically adjust the position of the permanent magnet along with the change of the rotating speed so that the permanent magnet corresponds to conductor rings made of different materials in a secondary conductor plate, thereby obtaining excellent braking performance in a wide speed range; the primary part and the secondary part of the rotary eddy current brake provided by the invention have no physical contact, no friction and no abrasion, and the rotary eddy current brake has the advantages of long service life and convenience in maintenance.
Drawings
Fig. 1 is a typical braking characteristic curve of a conventional eddy current brake.
Fig. 2 is a three-dimensional sectional structural view of an eddy current brake in the present invention.
Fig. 3 is a three-dimensional explosion diagram of the eddy current brake in the present invention.
Fig. 4 is a graph of the alignment of the permanent magnets with the inner ring permanent magnets at a lower speed.
Fig. 5 is a graph of the alignment of the permanent magnets with the outer ring permanent magnets at higher speeds.
Fig. 6 is a graph of the braking characteristics of an eddy current brake at different secondary conductor plate materials.
Fig. 7 is a structure view of a multi-segment spliced secondary conductor plate of the wide speed area eddy current brake proposed by the present invention.
Fig. 8 is a graph of an ideal braking characteristic of the wide speed range eddy current brake proposed by the present invention.
Fig. 9 is a three-dimensional cross-sectional structural view of an eddy current brake according to a second embodiment.
Fig. 10 is a schematic three-dimensional explosion view of an eddy current brake according to a second embodiment.
Fig. 11 is a three-dimensional cross-sectional structural view of an eddy current brake according to a third embodiment.
Fig. 12 is a three-dimensional explosion diagram of the eddy current brake in the third embodiment.
The reference numbers in the figures are: 1 is a moiety; 2 is a moiety; 1-1 is primary back iron; 1-2 is a primary adapter plate; 1-3 are pressure springs; 1-4 are permanent magnets; 2-1 is a conductor ring No. 1; 2-2 is a No. 2 conductor ring; 2-3 is a No. 3 conductor ring; 2-4 is a number 4 conductor ring; and 2-5 is secondary back iron.
Detailed Description
The invention will be described in further detail below with reference to the accompanying drawings: the present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation is given, but the scope of the present invention is not limited to the following embodiments.
The first embodiment is as follows: as shown in fig. 2 and 3, the wide-speed-range rotating eddy-current brake based on the adaptive adjustment of the rotating speed according to the present embodiment includes 2 primary portions and 1 secondary portion. The primary part is the rotor of the rotary eddy current brake proposed by the present invention.
As shown in fig. 3, the primary part includes a primary back iron, a primary adapter plate, a pressure spring, and a permanent magnet; the number of the permanent magnets is the same as that of the pressure springs, and the number of the permanent magnets and the number of the pressure springs can be selected according to the actual application requirement. The permanent magnet and the pressure spring are connected together and mounted in a rectangular slot in the primary adapter plate. The permanent magnet can reciprocate in rectangular groove, and this accessible linear guide realizes. The connection of the permanent magnets to the compression springs and the mounting of the linear guide are not contemplated by the present patent. The primary back iron and the primary adapter plate are connected together and are coaxial. The primary back iron is made of high-permeability magnetic materials, and the primary adapter plate is made of non-permeability structural parts such as aluminum alloy, stainless steel and the like.
The secondary portion includes a number 1 conductor loop, a number 2 conductor loop, a number 3 conductor loop, and a number 4 conductor loop or more. The conductor rings 1, 2, 3, and 4 are made of different materials, and the conductivity gradually decreases from inside to outside (for example, the conductor ring 1 is made of a copper material, the conductor ring 2 is made of an aluminum material, the conductor ring 3 is made of a zinc material, and the conductor ring 4 is made of a steel material). The No. 1 conductor ring, the No. 2 conductor ring, the No. 3 conductor ring and the No. 4 conductor ring are tightly attached together and are coaxial in pairs.
The permanent magnet can adopt a rectangular structure or a similar rectangular structure with double lower arc sides.
The magnetizing direction of the permanent magnets is axial magnetizing, and the magnetizing directions of the two adjacent permanent magnets are opposite.
Example two: as shown in fig. 9 and 10, the rotational eddy current brake of the present embodiment, which is a wide speed range rotational eddy current brake based on adaptive rotation speed adjustment, includes 1 primary part and 1 secondary part. The primary part is the rotor of the rotary eddy current brake proposed by the present invention.
As shown in fig. 10, the primary part includes a primary back iron, a primary adapter plate, a pressure spring, and a permanent magnet; the number of the permanent magnets is the same as that of the pressure springs, and the number of the permanent magnets and the number of the pressure springs can be selected according to the actual application requirement. The permanent magnet and the pressure spring are connected together and mounted in a rectangular slot in the primary adapter plate. The permanent magnet can reciprocate in rectangular groove, and this accessible linear guide realizes. The connection of the permanent magnets to the compression springs and the mounting of the linear guide are not contemplated by the present patent. The primary back iron and the primary adapter plate are connected together and are coaxial. The primary back iron is made of high-permeability magnetic materials, and the primary adapter plate is made of non-permeability structural parts such as aluminum alloy, stainless steel and the like.
The secondary portion includes a number 1 conductor loop, a number 2 conductor loop, a number 3 conductor loop, a number 4 conductor loop, and a secondary back iron. The conductor rings 1, 2, 3, and 4 are made of different materials, and the conductivity gradually decreases from inside to outside (for example, the conductor ring 1 is made of a copper material, the conductor ring 2 is made of an aluminum material, the conductor ring 3 is made of a zinc material, and the conductor ring 4 is made of a steel material). The No. 1 conductor ring, the No. 2 conductor ring, the No. 3 conductor ring and the No. 4 conductor ring are tightly attached together and are coaxial in pairs. A greater number of conductor loops may be selected as desired.
The secondary back iron is made of a high-permeability magnetic material.
The permanent magnet can adopt a rectangular structure or a similar rectangular structure with double lower arc sides.
The magnetizing direction of the permanent magnets is axial magnetizing, and the magnetizing directions of the two adjacent permanent magnets are opposite.
Example three: as shown in fig. 11 and 12, the present embodiment relates to a wide speed range rotational eddy current brake based on adaptive rotation speed adjustment, which includes 1 primary part and 2 secondary parts. The stator part is the rotor of the rotary eddy-current brake proposed by the present invention.
As shown in fig. 12, the primary part includes a primary interposer, a pressure spring, and a permanent magnet; the number of the permanent magnets is the same as that of the pressure springs, and the number of the permanent magnets and the number of the pressure springs can be selected according to the actual application requirement. The permanent magnet and the pressure spring are connected together and mounted in a rectangular slot in the primary adapter plate. The permanent magnet can reciprocate in rectangular groove, and this accessible linear guide realizes. The connection of the permanent magnets to the compression springs and the mounting of the linear guide are not contemplated by the present patent. The primary adapter plate is made of a non-magnetic structure such as aluminum alloy, stainless steel, etc.
The secondary portion includes a number 1 conductor loop, a number 2 conductor loop, a number 3 conductor loop, a number 4 conductor loop, and a secondary back iron. The conductor rings 1, 2, 3, and 4 are made of different materials, and the conductivity gradually decreases from inside to outside (for example, the conductor ring 1 is made of a copper material, the conductor ring 2 is made of an aluminum material, the conductor ring 3 is made of a zinc material, and the conductor ring 4 is made of a steel material). The No. 1 conductor ring, the No. 2 conductor ring, the No. 3 conductor ring and the No. 4 conductor ring are tightly attached together and are coaxial in pairs. A greater number of conductor loops may be selected as desired.
The secondary back iron is made of a high-permeability magnetic material.
The permanent magnet can adopt a rectangular structure or a similar rectangular structure with double lower arc sides.
The magnetizing direction of the permanent magnets is axial magnetizing, and the magnetizing directions of the two adjacent permanent magnets are opposite.
Example four: as shown in fig. 4 to 8, in the wide speed range rotating eddy current brake based on the adaptive regulation of the rotating speed according to the present embodiment, the radius of the conductor loop of the secondary part is calculated as follows:
as shown in fig. 4, when the stator part rotates at a lower speed, the centrifugal force applied to the permanent magnet is lower and is not enough to overcome the pressure of the pressure spring, so that the permanent magnet is aligned with the conductor ring No. 1; when the stator part rotates at a higher speed, the centrifugal force applied to the permanent magnet increases gradually, causing the spring to deform and the position of the permanent magnet to move outward, aligning with the outer conductor ring, as shown in fig. 5.
By the basic operating principle of the eddy-current brakeIt is known that the higher the secondary resistivity, the better the braking performance of the eddy current brake in the high speed region, as shown in fig. 6. In FIG. 6, n1Representing the intersection of the braking force characteristic curves, n, for copper and aluminium respectively, for the secondary conductor2Denotes the intersection of the braking force characteristic curves, n, for aluminum and zinc secondary conductors, respectively3The intersection of the braking force characteristic curves when the secondary conductors were zinc and stainless steel, respectively, is shown.
Let the radius of the contact boundary between the conductor rings be R1、R2And R3As shown in fig. 7. In order to obtain a large braking torque in a wide speed range of the eddy-current brake, R is set according to the following principle1、R2And R3I.e. when the speed reaches n1While the center position of the permanent magnet is aligned with R1(ii) a When the rotating speed reaches n2While the center position of the permanent magnet is aligned with R2(ii) a When the rotating speed reaches n3The center position of the permanent magnet is aligned with R3。
The forces to which the permanent magnets are subjected including centrifugal force FcSpring repulsive force FkAnd gravity FgThe formulas are respectively shown as formulas (1), (2) and (3).
Figure BDA0002095879140000071
In the formula, m is the mass of the permanent magnet, r is the radius of the center of the permanent magnet, and n is the rotating speed of the rotor.
Fk＝kx (11)
In the formula, k is the stiffness coefficient of the spring, and x is the spring deformation.
Fg＝mg (12)
When the permanent magnets are right above and right below the center of the rotor, the resultant force F is appliedupAnd FdownAre respectively as
Fup＝Fc-Fk-Fg (13)
Fdown＝Fc-Fk+Fg (14)
To eliminate to the maximum extentExcept the influence of gravity on the position of the permanent magnet, the rotating speed is ensured to be more than or equal to n1The centrifugal acceleration of time being much greater than the gravitational acceleration, i.e.
Figure BDA0002095879140000072
In the formula, R0The initial position of the permanent magnet.
To satisfy when the rotating speed reaches n1While the center position of the permanent magnet is aligned with R1(ii) a When the rotating speed reaches n2While the center position of the permanent magnet is aligned with R2(ii) a When the rotating speed reaches n3The center position of the permanent magnet is aligned with R3The following equations are listed:
Figure BDA0002095879140000073
Figure BDA0002095879140000074
Figure BDA0002095879140000081
in the above equation, the mass m and the rotation speed n of the permanent magnet1、n2And n3Spring stiffness coefficient k, permanent magnet initial position R0May be given as desired. To this end, R can be obtained by solving a linear system of equations (three equations solving three variables)1、R2And R3。
By setting R as above1、R2And R3Good braking characteristics can be obtained over a wide speed range, and the characteristic curve is approximated as shown in fig. 8. The advantage of the wide speed range eddy current brake proposed by the present invention compared to a conventional eddy current brake can be clearly seen by comparing fig. 8 and fig. 1.
The structure of the invention is provided, the permanent magnet gradually draws close outwards along with the increase of the rotating speed, and the stator permanent magnet is opposite to the high-resistivity conductor ring; on the other hand, as the rotating speed is reduced, the permanent magnets gradually get close inwards, and the stator permanent magnets are opposite to the low-resistivity conductor ring. Equivalently, it can be considered that when the rotating speed is changed from small to large, the resistivity of the secondary conductor is changed from small to large, i.e. the rotating eddy-current brake provided by the invention can have good braking performance in a wide speed range.
The above description is only a preferred embodiment of the present invention, and these embodiments are based on different implementations of the present invention, and the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (6)

1. The wide-speed-range rotating eddy current brake based on the self-adaptive regulation of the rotating speed is characterized by comprising a primary part (1) and a secondary part (2), wherein the primary part (1) comprises primary back iron (1-1), a primary adapter plate (1-2), a pressure spring (1-3) and a permanent magnet (1-4), the permanent magnet (1-4) and the pressure spring (1-3) are connected together and are installed in a rectangular groove on the primary adapter plate (1-2), and the primary back iron (1-1) and the primary adapter plate (1-2) are connected together and are coaxial; the secondary part (2) comprises a No. 1 conductor ring (2-1), a No. 2 conductor ring (2-2), a No. 3 conductor ring (2-3) and a No. 4 conductor ring (2-4), wherein the No. 1 conductor ring (2-1), the No. 2 conductor ring (2-2), the No. 3 conductor ring (2-3) and the No. 4 conductor ring (2-4) are made of conductors of different materials, the electrical conductivity of the conductors is gradually reduced from inside to outside, and the No. 1 conductor ring (2-1), the No. 2 conductor ring (2-2), the No. 3 conductor ring (2-3) and the No. 4 conductor ring (2-4) are closely attached together and are coaxial in pairs; the secondary part (2) is connected with the primary part (1) and the secondary part (2) is coaxial with the primary part (1);
the secondary part (2) comprises a secondary back iron (2-5), a conductor ring No. 1 (2-1), a conductor ring No. 2 (2-2), a conductor ring No. 3 (2-3), a conductor ring No. 4 (2-4) or a conductor ring No. n;
let the radius of the contact boundary between the conductor rings be R1、R2And R3In order to obtain a large braking torque in a wide speed range of the eddy-current brake, R is set as follows1、R2And R3I.e. when the speed reaches n1While the center position of the permanent magnet is aligned with R1(ii) a When the rotating speed reaches n2While the center position of the permanent magnet is aligned with R2(ii) a When the rotating speed reaches n3The center position of the permanent magnet is aligned with R3；
The forces to which the permanent magnets are subjected including centrifugal force FcSpring repulsive force FkAnd gravity FgThe formulas are respectively shown as formulas (1), (2) and (3)
Figure FDA0003120108680000011
In the formula, m is the mass of the permanent magnet, r is the radius of the center of the permanent magnet, and n is the rotating speed of the rotor;
Fk＝kx (2)
in the formula, k is the stiffness coefficient of the spring, and x is the deformation of the spring;
Fg＝mg (3)
when the permanent magnets are right above and right below the center of the rotor, the resultant force F is appliedupAnd FdownAre respectively as
Fup＝Fc-Fk-Fg (4)
Fdown＝Fc-Fk+Fg (5)
In order to eliminate the influence of gravity on the position of the permanent magnet to the maximum extent, the rotating speed is ensured to be more than or equal to n1The centrifugal acceleration of time being much greater than the gravitational acceleration, i.e.
Figure FDA0003120108680000021
In the formula, R0Is the initial position of the permanent magnet;
to satisfy when the rotating speed reaches n1While the center position of the permanent magnet is aligned with R1(ii) a When the rotating speed reaches n2While the center position of the permanent magnet is aligned with R2(ii) a When the rotating speed reaches n3The center position of the permanent magnet is aligned with R3The following equations are listed:
Figure FDA0003120108680000022
Figure FDA0003120108680000023
Figure FDA0003120108680000024
in equations (7), (8) and (9), the mass m and the rotational speed n of the permanent magnet1、n2And n3Spring stiffness coefficient k, permanent magnet initial position R0R can be given according to requirements by solving a linear equation system1、R2And R3。
2. The rotating eddy-current brake with wide speed range and adaptive adjustment based on rotating speed according to claim 1 is characterized in that the secondary part (2) comprises a conductor ring No. 1 (2-1), a conductor ring No. 2 (2-2), a conductor ring No. 3 (2-3), a conductor ring No. 4 (2-4) or a conductor ring No. n.
3. The rotating speed adaptive adjustment-based wide speed range rotating eddy current brake is characterized in that the number of the permanent magnets (1-4) is the same as that of the pressure springs (1-3), and the number of the permanent magnets (1-4) and the number of the pressure springs (1-3) can be selected according to the actual application requirement.
4. The rotating speed adaptive regulation-based wide speed range rotating eddy current brake is characterized in that the primary back iron (1-1) is made of a high-permeability magnetic material, the primary adapter plate (1-2) is made of a non-permeability magnetic material, and the secondary back iron (2-5) is made of a high-permeability magnetic material.
5. The wide-speed-range rotating eddy current brake based on adaptive rotation speed adjustment according to claim 1, wherein the permanent magnets (1-4) are of a rectangular structure or a rectangular-like structure with double lower arcs.
6. The rotating eddy-current brake with the wide speed range and the adaptive adjustment based on the rotating speed as claimed in claim 1, wherein the magnetizing direction of the permanent magnets (1-4) is axial magnetizing, and the magnetizing directions of two adjacent permanent magnets (1-4) are opposite.
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CN113193724B (en) * 2021-04-30 2023-03-03 哈尔滨工业大学 Low-inertia wide-speed-range permanent magnet eddy current brake
CN113285575A (en) * 2021-06-16 2021-08-20 安徽沃弗永磁科技有限公司 Permanent magnet speed regulator combined conductor disc
CN113392562B (en) * 2021-06-29 2022-08-16 哈尔滨工业大学 Modeling method for axial magnetic flux secondary guide strip type permanent magnet eddy current brake

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5691587A (en) * 1993-05-21 1997-11-25 Magna Force, Inc. Magnetic centrifugal clutch
JP2001017041A (en) * 1999-07-02 2001-01-23 Akebono Brake Ind Co Ltd Braking mechanism for reel supported with bearings at both ends
CN1945946A (en) * 2005-10-09 2007-04-11 陈伯恒 Magnetic brake
CN103023272A (en) * 2012-12-21 2013-04-03 鞍山钦元节能设备制造有限公司 Permanent magnet eddy-current flexible-transmission coupling
CN103259352A (en) * 2013-03-25 2013-08-21 杭州德沃仕电动科技有限公司 Built-in type permanent magnet motor structure with movable magnetic steel
DE102013211919B4 (en) * 2013-06-24 2015-05-13 Schaeffler Technologies AG & Co. KG Roller device for a traction mechanism drive of a motor vehicle
CN103414313B (en) * 2013-08-28 2017-05-31 北京良明宇航节能动力装备技术开发中心 Centrifugal magnetic transmission device
US10364125B2 (en) * 2015-04-24 2019-07-30 Conductix, Inc. Cable reel eddy current brake
CN104967280B (en) * 2015-07-21 2017-09-08 南京迪瓦机械制造有限公司 A kind of radial direction buffer-type magnetic coupling

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