DE102012017807A1 - Electronic control device for magnetorheological fluid (MRF) brake, has evaluation electronics unit and controller, and shear stress sensor that is accommodated in MRF brake, for measuring shear stress of MRF brake - Google Patents
Electronic control device for magnetorheological fluid (MRF) brake, has evaluation electronics unit and controller, and shear stress sensor that is accommodated in MRF brake, for measuring shear stress of MRF brake Download PDFInfo
- Publication number
- DE102012017807A1 DE102012017807A1 DE201210017807 DE102012017807A DE102012017807A1 DE 102012017807 A1 DE102012017807 A1 DE 102012017807A1 DE 201210017807 DE201210017807 DE 201210017807 DE 102012017807 A DE102012017807 A DE 102012017807A DE 102012017807 A1 DE102012017807 A1 DE 102012017807A1
- Authority
- DE
- Germany
- Prior art keywords
- shear stress
- mrf
- control electronics
- brake according
- brake
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000011156 evaluation Methods 0.000 title claims abstract description 12
- 239000012530 fluid Substances 0.000 title claims description 9
- 229920002472 Starch Polymers 0.000 claims 1
- 235000019698 starch Nutrition 0.000 claims 1
- 239000008107 starch Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D57/00—Liquid-resistance brakes; Brakes using the internal friction of fluids or fluid-like media, e.g. powders
- F16D57/002—Liquid-resistance brakes; Brakes using the internal friction of fluids or fluid-like media, e.g. powders comprising a medium with electrically or magnetically controlled internal friction, e.g. electrorheological fluid, magnetic powder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/17—Using electrical or electronic regulation means to control braking
- B60T8/171—Detecting parameters used in the regulation; Measuring values used in the regulation
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- Braking Arrangements (AREA)
Abstract
Description
Die vorliegende Erfindung betrifft eine Regelelektronik für eine MRF-Bremse. MRF-Bremsen sind bekannt und dadurch gekennzeichnet, dass die Bremswirkung durch eine Viskositätsänderung einer magnetorheologischen Flüssigkeit (MRF) entsteht. Die Viskositätsänderung erfolgt durch das erzeugen eines Magnetfeldes durch die MR-Flüssigkeit hindurch. Je größer die Flussdichte B ist, desto höher ist die Viskosität bzw. Scherspannung. Die Bremse dient zum Halten oder Bremsen von z. B. Motoren. Die Bremse besteht aus einem Permanentmagneten und einer Steuerspule. Die Magnetfelder der Steuerspule und des Permanentmagneten können sich aufheben (entgegengesetzt gerichtet) oder addieren (gleichgerichtet). Der Permanentmagnet dient zur Aufrechterhaltung der Bremswirkung auch ohne das ein Stromfluss durch die Spule besteht. Dies ist insbesondere dann notwendig, wenn die Bremse in NOT-AUS-Situationen o. ä. eine Bremswirkung erzielen soll. Beispiel hierfür wäre ein Industrieroboter, bei welchem auch im stromlosen Zustand die Bremse die Armglieder des Roboters halten muss. Die MRF ist im unteren Scherspannungsbereich stark von der Temperatur und der Drehzahl abhängig. Dies ändert sich bei größeren Scherspannungen bzw. Flussdichten, da sich immer mehr Ketten in der MRF bilden. Da die Bremse im Dauerbremsbetrieb, z. B. zur Aufrechterhaltung einer Fadenspannung, sich schnell stark erwärmt, ändert sich das Bremsmoment. Um dies auszugleichen ist eine Regelung notwendig. Hierfür ist ein Sensor notwendig welcher die Scherspannung misst. Dies kann bspw. über einen Dehnungsmessstreifen in bestimmten Anordnungen erreicht werden. Dieser Scherspannungssensor wird an eine Auswerteelektronik angeschlossen, welche den aktuellen IST-Wert der Scherspannung ausgibt. Dieser IST-Wert wird, wie der SOLL-Wert, dem Regler zugeführt. Um eine höhere Dynamik zu erzielen können ebenfalls Störgrößen (Temperatur u./o. Drehzahl) erfasst und dem Regler übergeben werden. Dieser ermittelt die notwendige Stellgröße.The present invention relates to a control electronics for an MRF brake. MRF brakes are known and characterized in that the braking effect is caused by a change in viscosity of a magnetorheological fluid (MRF). The change in viscosity occurs by generating a magnetic field through the MR fluid. The larger the flux density B, the higher the viscosity or shear stress. The brake is used to hold or brake z. B. engines. The brake consists of a permanent magnet and a control coil. The magnetic fields of the control coil and the permanent magnet can cancel (oppositely directed) or add (rectified). The permanent magnet serves to maintain the braking effect even without a current flow through the coil. This is particularly necessary when the brake in emergency stop situations o. Ä. Should achieve a braking effect. An example of this would be an industrial robot, in which the brake must hold the arm links of the robot even when de-energized. The MRF is heavily dependent on temperature and speed in the lower shear stress range. This changes with larger shear stresses or flux densities, as more and more chains form in the MRF. Since the brake in continuous braking, z. B. to maintain a thread tension, quickly heated up quickly, the braking torque changes. To compensate for this, a regulation is necessary. For this purpose, a sensor is necessary which measures the shear stress. This can be achieved, for example, via a strain gauge in certain arrangements. This shear stress sensor is connected to an evaluation electronics, which outputs the current actual value of the shear stress. This ACTUAL value, like the DESIRED value, is fed to the controller. To achieve greater dynamics, disturbance variables (temperature and / or speed) can also be detected and transferred to the controller. This determines the required manipulated variable.
Vorteileadvantages
Das hier beschriebene Verfahren ermöglicht eine Regelung der Scherspannung. Dies ist insbesondere bei kleinen Bremsmomenten notwendig, da diese stärker von den äußeren Einflüssen (Temperatur, Drehzahl) abhängig sind.The method described here allows a regulation of the shear stress. This is especially necessary for small braking torques, as they are more dependent on the external influences (temperature, speed).
Claims (16)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE201210017807 DE102012017807A1 (en) | 2012-09-10 | 2012-09-10 | Electronic control device for magnetorheological fluid (MRF) brake, has evaluation electronics unit and controller, and shear stress sensor that is accommodated in MRF brake, for measuring shear stress of MRF brake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE201210017807 DE102012017807A1 (en) | 2012-09-10 | 2012-09-10 | Electronic control device for magnetorheological fluid (MRF) brake, has evaluation electronics unit and controller, and shear stress sensor that is accommodated in MRF brake, for measuring shear stress of MRF brake |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE102012017807A1 true DE102012017807A1 (en) | 2014-06-12 |
Family
ID=50777655
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE201210017807 Withdrawn DE102012017807A1 (en) | 2012-09-10 | 2012-09-10 | Electronic control device for magnetorheological fluid (MRF) brake, has evaluation electronics unit and controller, and shear stress sensor that is accommodated in MRF brake, for measuring shear stress of MRF brake |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE102012017807A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102017004615A1 (en) | 2017-03-31 | 2018-10-04 | Kastriot Merlaku | Pedal vehicle, bike or purely by muscle-powered vehicle for children |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3609861A1 (en) * | 1986-03-22 | 1987-09-24 | Bayer Ag | SENSOR CONTROLLED HYDRAULIC SYSTEM WITH ELECTROVISCOSIC LIQUIDS |
| DE19735897A1 (en) * | 1997-08-19 | 1999-02-25 | Bayer Ag | clutch |
| US20080097269A1 (en) * | 2004-11-09 | 2008-04-24 | Brian Weinberg | Electro-Rheological Fluid Brake and Actuator Devices and Orthotic Devices Using the Same |
| WO2011041890A1 (en) * | 2009-10-09 | 2011-04-14 | The University Of Western Ontario | Magneto-rheological clutch with sensors measuring electromagnetic field strength |
| WO2012154466A1 (en) * | 2011-05-06 | 2012-11-15 | Washington State University Research Foundation | Magnetorheological devices and associated methods of control |
-
2012
- 2012-09-10 DE DE201210017807 patent/DE102012017807A1/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3609861A1 (en) * | 1986-03-22 | 1987-09-24 | Bayer Ag | SENSOR CONTROLLED HYDRAULIC SYSTEM WITH ELECTROVISCOSIC LIQUIDS |
| DE19735897A1 (en) * | 1997-08-19 | 1999-02-25 | Bayer Ag | clutch |
| US20080097269A1 (en) * | 2004-11-09 | 2008-04-24 | Brian Weinberg | Electro-Rheological Fluid Brake and Actuator Devices and Orthotic Devices Using the Same |
| WO2011041890A1 (en) * | 2009-10-09 | 2011-04-14 | The University Of Western Ontario | Magneto-rheological clutch with sensors measuring electromagnetic field strength |
| WO2012154466A1 (en) * | 2011-05-06 | 2012-11-15 | Washington State University Research Foundation | Magnetorheological devices and associated methods of control |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102017004615A1 (en) | 2017-03-31 | 2018-10-04 | Kastriot Merlaku | Pedal vehicle, bike or purely by muscle-powered vehicle for children |
| DE102017004615B4 (en) * | 2017-03-31 | 2020-11-05 | Kastriot Merlaku | Pedal vehicles, bicycles or vehicles powered purely by muscle power for children |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee |