CN106655707A - Rotary type permanent magnet turbine wheel hub retarder and control method thereof - Google Patents
Rotary type permanent magnet turbine wheel hub retarder and control method thereof Download PDFInfo
- Publication number
- CN106655707A CN106655707A CN201611203891.6A CN201611203891A CN106655707A CN 106655707 A CN106655707 A CN 106655707A CN 201611203891 A CN201611203891 A CN 201611203891A CN 106655707 A CN106655707 A CN 106655707A
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- Prior art keywords
- permanent magnet
- retarder
- magnetic
- groove
- wheel side
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Classifications
-
- 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
-
- 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 discloses a rotary type permanent magnet turbine wheel hub retarder. The rotary type permanent magnet turbine wheel hub retarder comprises a rotor disc, a rotating motor, a permanent magnet and a wheel hub retarder shell, wherein the wheel hub retarder shell comprises an outer shell, a middle magnetic powder layer and magnetic conductive plates; the interior of the wheel hub retarder shell is hollow, and magnetic powder is filled in the hollow part; a groove I is formed in the upper part of the outer shell, and a groove is formed in the lower part of the outer shell; a circular arc groove is formed in the middle part of the groove I; the permanent magnet is arranged in the circular arc groove; the magnetic conductive plates are arranged on the side face of the circular groove and the side face of the groove II; an air gap I is formed between the permanent magnet and the magnetic conductive plate on the side face of the circular arc groove; the permanent magnet is connected to the rotating motor; the rotating motor is connected to a storage battery through a controller; the rotor disc is arranged in the groove II; and an air gap II is formed between the rotor disc and the groove II. The rotary type permanent magnet turbine wheel hub retarder is stable and reliable in performance, the braking frequency can be reduced, no noise or dust is generated, the temperature rise of a brake generated by braking is reduced, the service life of the braking system is prolonged, and the traveling safety of the braking system is improved.
Description
Technical field
The invention belongs to field of automobile brake, and in particular to a kind of rotary permanent-magnet vortex wheel side retarder and its controlling party
Method.
Background technology
At present, the friction brake used by all kinds of automobiles can be divided into drum-type and the big class of disc type two, friction catch process reality
On be by the kinetic energy of running car by brake absorb be converted to heat energy, cause brake temperature to raise, affect braking ability.
Because disk brake has heat resistanceheat resistant degenerative strong, size and quality less and that brake efficiency is stable etc. is excellent compared with drum brake
Point, so disk brake is applied on automobile gradually increasing.But either disk brake or drum brake all can
Produce noise and give out the harmful substance of dust etc, especially under long descending or frequent damped condition, friction brake
Temperature steeply rises, and heat resistanceheat resistant degenerative drastically declines.
Wheel side retarder is produced with the development of current vortex retarder.Current vortex retarder is in 19th-century profit
Grow up on the basis of the electromagnetic coupling theory that Europe Foucault (Leon Foucault) finds.1903, Steckler
(Steckel) a kind of patent of electro-magnetic braking device has been applied for first.1936, Rule Sai Ruizhen (Raoul Sprain) was first
It is secondary that electromagnetic brake technology is applied on automobile.Nineteen sixty-five Tai Lema（TELMA）Company's design occurs in that first without central shaft,
To be mounted directly to speed changer or the current vortex retarder on drive axle.Occur in that within 1993 and do current vortex retarder with power transmission shaft
All-in-one-piece product.1996, the current vortex retarder cooled down with engine coolant is occurred in that in the world, the retarder
In be also equipped with a small generator, dress in the continuous development, improvement and various through decades is used, electric vortex buffering
The production of device and using gradually growing up.But the features such as current vortex retarder has big volume, quality weight, is only applicable to big
Medium-sized commercial car, it is impossible to for passenger car, therefore, most designers start to study taking turns side retarder.
A kind of structure of wheel side retarder is disclosed in patent US6286637B1, friction is solved to a certain extent
Some problems of brake, but the structure of the wheel side retarder carries out magnetic conduction, structure using a round steel pipe as yoke
Form is single, it is impossible to meet the situation of installing space and installation site change, permeability is not high, and leakage field is more, it is impossible to reach
The auxiliary braking effect of side retarder is taken turns well.
The content of the invention
To solve the above problems, the invention discloses a kind of rotary permanent-magnet vortex wheel side retarder and its control method,
It is stable and reliable for performance, braking number of times can be reduced, without noise and dust, the brake temperature rise that braking is produced is reduced, improve braking
System service life and travel safety.
To reach above-mentioned purpose, technical scheme is as follows：
A kind of rotary permanent-magnet vortex wheel side retarder, including rotor disk, electric rotating machine, permanent magnet, wheel side retarder housing, institute
Stating wheel side retarder housing includes outer casing, middle magnetic blow out coating, magnetic conduction sheet, and wheel side retarder enclosure interior is hollow, hollow
Magnetic is partially filled with, outer casing top is provided with groove one, and outer casing lower section is provided with groove two, and the middle part of the groove one is provided with
Arc groove, the permanent magnet is arranged in arc groove, and the magnetic conduction sheet is arranged on arc groove and groove two side faces, permanent magnet and circle
Air gap one is provided between the magnetic conduction sheet of arc groove side, the permanent magnet connects electric rotating machine, and electric rotating machine is connected by controller
Battery, the rotor disk is arranged in groove two, and air gap two is provided between rotor disk and groove two.
Used as a modification of the present invention, the air gap one is 1-3mm.
Used as a modification of the present invention, the air gap two is 1-3mm.
Used as a modification of the present invention, the wheel side retarder housing is trapezoidal or rectangle.
Used as a modification of the present invention, the rotor disk is circle.
Used as a modification of the present invention, the permanent magnet is cuboid.
A kind of control method of above-mentioned rotary permanent-magnet vortex wheel side retarder, the main anglec of rotation by changing permanent magnet
Spend to be adjusted the size of retarder braking moment control；Its concrete control method is：When permanent magnet magnetic pole line with
When magnetic conduction sheet is parallel, due to the effect of NULL, the magnetic field of permanent magnet can not be by rotor disk, and now permanent magnet is in non-work
Make state；When driver's brake pedal is slowed down or braked, controller receives the brake signal of driver, according to
Built-in program calculates wheel side retarder needs the braking moment for providing and permanent magnet to need the angle of rotation, electric rotating machine
Drive the corresponding angle of permanent magnet rotate counterclockwise, now due to both sides magnetic conduction sheet effect so that the magnetic field of permanent magnet can
With by magnetic conduction sheet, then loop is constituted by magnetic, rotor disk, with the rotation of rotor disk, rotor disk cutting magnetic induction line, slowly
Device is functioned to, in on-position；When not needing retarder work or braking stopping, control electric rotating machine is rotated backward
Equal angular, makes permanent magnet come back to the magnetic pole line of the position of off working state, i.e. permanent magnet with magnetic conduction sheet when parallel
Position, retarder quits work.
The invention has the beneficial effects as follows：
Electric rotating machine of the present invention, wheel side retarder housing are connected respectively with the fixture on car, it is ensured that wheel side retarder
There is certain gap between housing and permanent magnet, be easy to rotate, rotor disk is mounted in the rotary shaft on vehicle wheel side, together with wheel
Rotation, when taking turns side retarder and being in braking operation state, magnetic field constitutes loop between permanent magnet, magnetic, rotor disk, can be with
Reach good magnetic conduction effect.With the rotation of rotor disk, rotor disk cutting magnetic induction line, start braking；General retarder is present
Serious leakage field phenomenon, the outer layer of magnetic is made up of using a circle magnetic shielding material in wheel side retarder housing of the present invention
Housing, the outer casing should with magnetic screening action both can be very good to prevent external magnetic field to internal impact, it is also possible to anti-
Only internal magnetic field rushes down leakage, take turns side retarder rise braking action premise be permanent magnet magnetic field can by magnetic conduction sheet, so as to
Magnetic, rotor disk constitute loop.The outer casing of wheel side retarder can be made up of magnetic shielding material aluminium or copper, magnetic conduction sheet material
It can be the permeability magnetic material of pure iron or alloy etc.The shape of wheel side retarder housing can for rectangle can also for trapezoidal,
Can be other shapes, with specific reference to space and installation site appropriate change is carried out.
Continuous because electric rotating machine drives the rotation of permanent magnet, with the difference of the anglec of rotation, braking moment it is big
It is little be also it is different, by the control to the anglec of rotation, the purpose that the size to braking moment is adjusted controlling can be reached,
Wheel side of the present invention retarder can effectively make up deficiency of the existing brake system in technical performance, improve vapour
The security of car traveling, is a kind of contactless brake, and a kind of utilization electromagnetic principle produces the retarding device of braking moment.It
Change automobile in prior art shorten because of the frequently braking by mechanical braking system brakes service life and
Cause the temperature rise of friction brake and reduce the braking ability of brake, it is possible to reduce brakeage number of times, effectively solve
Certainly noise and dust problem, while can also reduce the temperature rise of friction brake, improve the performance of brakes and the peace of driving
Quan Xing, and the braking moment of retarder brake is consecutive variations torque, and braking ability is stable.
Description of the drawings
Fig. 1 is the structural representation of rotary permanent-magnet vortex wheel side retarder.
Fig. 2 is the main sectional view for taking turns side retarder housing.
Fig. 3 is on-position magnetic circuit figure.
Fig. 4 is the location diagram before braking.
Location diagram when Fig. 5 is braking.
Fig. 6 is control method schematic diagram.
Reference numerals list：
1st, rotor disk, 2, permanent magnet, 3, electric rotating machine, 4, wheel side retarder housing, 5, outer casing, 6, middle magnetic blow out coating, 7,
Magnetic conduction sheet, 8, air gap two, 9, brake pedal, 10, controller, 11, battery, 12, groove one, 13, arc groove, 14, groove two,
15th, air gap one.
Specific embodiment
With reference to the accompanying drawings and detailed description, the present invention is further elucidated, it should be understood that following specific embodiments are only
For illustrating the present invention rather than limiting the scope of the present invention.It should be noted that word " front " following used in description,
" afterwards ", "left", "right", "up" and "down" refer to the direction in accompanying drawing, and word " interior " and " outward " refer respectively to direction or remote
From the direction of particular elements geometric center.
Rotary permanent-magnet vortex wheel side retarder of the present invention, as shown in figure 1, including rotor disk 1, permanent magnet 2, rotation
Rotating motor 3, wheel side retarder housing 4, the rotor disk 1 is mounted in the rotary shaft on vehicle wheel side, is rotated together with wheel, takes turns side
Retarder housing 4 is not contacted with rotor disk 1, and air gap 28 is left in centre, can be 1-3mm distances, electric rotating machine 3, wheel side retarder
Housing 4 is connected respectively with the fixture on automobile, it is ensured that has certain gap between wheel side retarder housing 4 and permanent magnet 2, is
It is non-contacting, it to be easy to rotate, permanent magnet 2 is fixedly connected with electric rotating machine 3, and electric rotating machine 3 is powered by battery 11 to it, rotation
Motor 3 is rotated and drives permanent magnet 2 to rotate, and when in running order, between the magnetic conduction sheet of permanent magnet and arc groove side gas is provided with
Gap 1, is 1-3mm distances, when permanent magnet 2 turns to suitable position, magnetic field permanent magnet 2, wheel side retarder housing 4,
Loop is constituted between rotor disk 1 and air gap 28, braking moment is produced, braking effect is reached, because electric rotating machine 3 drives forever
The rotation of magnet 2 is continuous, and with the difference of the anglec of rotation, the size of braking moment is also different, by the anglec of rotation
The control of degree, can reach the purpose that the size to braking moment is adjusted controlling.
Fig. 2 is the main sectional view for taking turns side retarder housing, takes turns the not moving part on side retarder housing 4 and automobile and fixes and connects
Connect, used as stator, the wheel side retarder housing 4 is including outer casing 5, middle magnetic blow out coating 6, the part of magnetic conduction sheet 7 three, and wheel side is slow
Device housing 4 is hollow, is not entity, and in hollow space magnetic, when permanent magnet 2 moves to suitable position, magnetic field are full of
Loop is constituted between permanent magnet 2, middle magnetic blow out coating 6, rotor disk 1, good magnetic conduction effect can be reached, and adopt magnetic
In order to changing the shape of wheel side retarder housing 4, can which overcome installing space and installation site restriction and also can be with
Improve the magnetic conductivity of wheel side retarder.It is outer casing 5 in the periphery of magnetic, can be made up of magnetic shielding material aluminium or copper, outward
Layer housing 5 both can be very good to prevent external magnetic field to internal impact, it is also possible to prevent internal magnetic field from rushing down leakage.Magnetic conduction sheet 7 with it is outer
Layer housing 5 is connected, and the material of magnetic conduction sheet 7 can be the permeability magnetic material of pure iron or alloy etc, and wheel side retarder housing 4 can have many
Shape is planted, can also be able to be trapezoidal for rectangle, appropriate change can be carried out according to space and installation site.
Fig. 3 is on-position magnetic circuit figure, when driver's brake pedal is slowed down or braked, by turning counterclockwise
The certain angle of dynamic permanent magnet 2, permanent magnet 2 enters operating position, and the magnetic field of generation is in wheel side retarder housing 4 and rotor disk
Loop is constituted by magnetic conduction sheet 7, magnetic blow out coating 6, air gap 28 between 1.With the rotation of rotor disk 1, cutting magnetic induction line, magnetic field will
The effect of the power for hindering its rotation, i.e. braking moment are produced to rotor disk 1.
Fig. 4, Fig. 5 are the braking principle figures of the rotary permanent-magnet vortex wheel side retarder, and Fig. 4 is the position relationship before braking
Figure, location diagram when Fig. 5 is braking.Before work, electric rotating machine 3 does not work, because the magnetic screen of outer casing 5 is made
With the magnetic field of permanent magnet 2 is unable to the magnetic in UNICOM's magnetic blow out coating 6, so magnetic field can not constitute loop, retarder with rotor disk 1
Do not work, do not produce brake force；When driver's brake pedal is slowed down or braked, by controlling 3 turns of electric rotating machine
It is dynamic, drive permanent magnet 2 to rotate to an angle θ, now, the magnetic field of permanent magnet 2 by magnetic conduction sheet 7, permanent magnet 2, air gap 1,
A loop is constituted between magnetic conduction sheet 7, magnetic 6, magnetic conduction sheet 7, air gap 28, rotor disk 1, retarder is started working, with rotor
The rotation of disk 1, produces braking moment and is braked.
A kind of rotary permanent-magnet vortex wheel side retarder of the present invention can be controlled forever by controlling electric rotating machine 3
The anglec of rotation of magnet 2, is adjusted to the size of braking moment, so as to reach preferable braking effect.Its concrete controlling party
Method is as shown in Figure 6：Before being slowed down or being braked, electric rotating machine 3 does not work, and permanent magnet 2 is in off working state, now permanent magnetism
The magnetic pole line of iron 2 is parallel with magnetic conduction sheet 7, and due to the magnetic screening action of outer casing 5, the magnetic field of permanent magnet 2 can not pass through magnetic
Powder 6, magnetic field can not constitute loop with rotor disk 1, and retarder does not work, and does not produce brake force；When driver's brake pedal 9
When being slowed down or being braked, controller 10 receives the brake signal of driver, calculates wheel side according to built-in program slow
Device needs the braking moment for providing and the angle for needing rotation, and input control signal is to electric rotating machine 3, and electric rotating machine 3 is rapid
By the corresponding angle of the rotate counterclockwise of permanent magnet 2, now due to both sides magnetic conduction sheet 7 effect so that the magnetic field of permanent magnet 2 can
To pass through magnetic conduction sheet 7, then loop is constituted by magnetic 6, rotor disk 1, with the rotation of rotor disk 1, the cutting magnetic induction of rotor disk 1
Line, and start to be acted on by brake force, then retarder is functioned to, in running order；During end of braking, Electronic Control
Device 10 controls again electric rotating machine 3 and permanent magnet 2 is rotated backward into identical angle, makes permanent magnet 2 come back to off working state
Position when the magnetic pole line of position, i.e. permanent magnet 2 is parallel with magnetic conduction sheet 7, retarder quits work.
Technological means disclosed in the present invention program is not limited only to the technological means disclosed in above-mentioned embodiment, also includes
Constituted technical scheme is combined by above technical characteristic.
Claims (7)
1. a kind of rotary permanent-magnet vortex wheel side retarder, it is characterised in that：Including rotor disk, electric rotating machine, permanent magnet, wheel side
Retarder housing, the wheel side retarder housing includes outer casing, middle magnetic blow out coating, magnetic conduction sheet, in wheel side retarder housing
Portion is hollow, and in hollow space magnetic is full of, and outer casing top is provided with groove one, and outer casing lower section is provided with groove two, described
The middle part of groove one is provided with arc groove, and the permanent magnet is arranged in arc groove, and the magnetic conduction sheet is arranged on arc groove and groove two
Air gap one is provided between the magnetic conduction sheet of side, permanent magnet and arc groove side, the permanent magnet connects electric rotating machine, electric rotating machine
Battery is connected by controller, the rotor disk is arranged in groove two, and air gap two is provided between rotor disk and groove two.
2. a kind of rotary permanent-magnet vortex wheel side retarder according to claim 1, it is characterised in that：The air gap one is
1-3mm。
3. a kind of rotary permanent-magnet vortex wheel side retarder according to claim 1, it is characterised in that：The air gap two is
1-3mm。
4. a kind of rotary permanent-magnet vortex wheel side retarder according to claim 1, it is characterised in that：The wheel side is slow
Device housing is trapezoidal or rectangle.
5. a kind of rotary permanent-magnet vortex wheel side retarder according to claim 1, it is characterised in that：The rotor disk is
It is circular.
6. a kind of rotary permanent-magnet vortex wheel side retarder according to claim 1, it is characterised in that：The permanent magnet is
Cuboid.
7. the control method of a kind of rotary permanent-magnet vortex wheel side retarder according to claim 1, it is characterised in that：It is logical
Cross change permanent magnet the anglec of rotation come to the size of retarder braking moment be adjusted control；Its concrete control method is：
When the magnetic pole line of permanent magnet is parallel with magnetic conduction sheet, due to the effect of NULL, the magnetic field of permanent magnet can not pass through rotor
Disk, now permanent magnet is in off working state；When driver's brake pedal is slowed down or braked, controller is received
The brake signal of driver, according to built-in program braking moment and permanent magnet need that wheel side retarder needs to provide are calculated
The angle to be rotated, electric rotating machine drives the corresponding angle of permanent magnet rotate counterclockwise, now due to both sides magnetic conduction sheet work
With so that the magnetic field of permanent magnet by magnetic conduction sheet, then can constitute loop by magnetic, rotor disk, with the rotation of rotor disk,
Rotor disk cutting magnetic induction line, retarder is functioned to, in on-position；Stop when not needing retarder work or braking
When, control electric rotating machine rotates backward equal angular, makes permanent magnet come back to the magnetic of the position of off working state, i.e. permanent magnet
Position of the pole line with magnetic conduction sheet when parallel, retarder quits work.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611203891.6A CN106655707A (en) | 2016-12-23 | 2016-12-23 | Rotary type permanent magnet turbine wheel hub retarder and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611203891.6A CN106655707A (en) | 2016-12-23 | 2016-12-23 | Rotary type permanent magnet turbine wheel hub retarder and control method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106655707A true CN106655707A (en) | 2017-05-10 |
Family
ID=58826802
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611203891.6A Pending CN106655707A (en) | 2016-12-23 | 2016-12-23 | Rotary type permanent magnet turbine wheel hub retarder and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106655707A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113891770A (en) * | 2019-05-20 | 2022-01-04 | 施洛伊尼格股份公司 | Straightening device for straightening a wire, method for braking at least one rotatable roller in a straightening device, cable processing machine with a straightening device, and upgrading kit for a cable processing machine |
| CN114889440A (en) * | 2022-06-08 | 2022-08-12 | 中车青岛四方车辆研究所有限公司 | Permanent magnet eddy current brake release state switching method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103303150A (en) * | 2013-06-17 | 2013-09-18 | 江苏大学 | Wheel edge retarder for trailer and control method of retarder |
| US20150188400A1 (en) * | 2013-12-31 | 2015-07-02 | Robert Louis Kemp | Magnetic Flywheel Induction Engine-Motor-Generator |
-
2016
- 2016-12-23 CN CN201611203891.6A patent/CN106655707A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103303150A (en) * | 2013-06-17 | 2013-09-18 | 江苏大学 | Wheel edge retarder for trailer and control method of retarder |
| US20150188400A1 (en) * | 2013-12-31 | 2015-07-02 | Robert Louis Kemp | Magnetic Flywheel Induction Engine-Motor-Generator |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113891770A (en) * | 2019-05-20 | 2022-01-04 | 施洛伊尼格股份公司 | Straightening device for straightening a wire, method for braking at least one rotatable roller in a straightening device, cable processing machine with a straightening device, and upgrading kit for a cable processing machine |
| CN114889440A (en) * | 2022-06-08 | 2022-08-12 | 中车青岛四方车辆研究所有限公司 | Permanent magnet eddy current brake release state switching method |
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Application publication date: 20170510 |