Magnetic Braking Device

• US 20120228067A1
• Filed: 11/22/2010
• Published: 09/13/2012
• Est. Priority Date: 11/24/2009
• Status: Abandoned Application

• Current Assignee: Ana Ungureanu, Federica Muratori
• Original Assignee: Ana Ungureanu, Federica Muratori
• Inventors: Muratori, Federica, Ungureanu, Ana
• Application Number:
  US13/509,830
• Publication Number:
  US 20120228067A1
• Time in Patent Office: Days
• US Class Current: 188/83
• CPC Class Codes: F16D 2121/20 using electromagnets
• CPC Class Codes: F16D 2121/22 for releasing a normally applied brake
• CPC Class Codes: F16D 2129/065 Permanent magnets
• CPC Class Codes: F16D 59/02 spring-loaded and adapted to be released by mechanical, fluid, or electromagnetic means
• CPC Class Codes: F16D 65/186 with full-face force-applying member, e.g. annular

Abstract

A magnetic braking device (100) has a first metal disc (1) slidably mounted on a drive shaft (50) of a motor and having first peripheral seatings (2a) arranged in a ring, for receiving first permanent magnets (2) of predetermined polarity. A second metal disc (3) is fixedly mounted with respect to the motor (5) and has second peripheral seatings (4a), arranged in a ring geometrically similar to and facing the first seatings (2a). The second peripheral seatings (4a) receive corresponding second permanent magnets (4) having the same polarity as the first magnets (2). Braking occurs by magnetic attraction between the magnets (2, 4) and the discs (1, 3), the discs coming into contact while maintaining the magnets (2, 4) mutually offset. Each magnet (2, 4) is opposite the respective portion of disc (3, 1) interposed between the successive peripheral seatings (4a, 2a).

Claims

1. A magnetic braking device for use with a drive shaft of a motor comprising:

at least one first disc (1) slidably mounted on the drive shaft (50) and provided with at least one series of first peripheral seatings (2a) arranged in a first ring, destined to receive first permanent magnets (2) of predetermined polarity;

at least one second disc (3) fixedly mounted with respect to a casing of the motor (5) and provided with at least one series of second peripheral seatings (4a), arranged on a second ring geometrically similar to and facing the first ring on which the first seatings (2a) are arranged, the second peripheral seatings (4) being destined to receive corresponding second permanent magnets (4) having the same polarity as the first magnets (2);

at least one of the first or second discs (1, 3) being made of a metal material and having at least steel portions;

the first and second discs (1, 3) moving into reciprocal contact due to a magnetic attraction exerted by the at least steel portions of the metal disc (3, 1) which steel portions are interposed between successive peripheral seatings (4a, 2a) and which steel portions attract the respective magnets (2, 4) of the disc (1, 3) which attract the respective magnets (2, 4) of the opposite disc (1, 3) so as to enable establishing a braking condition of the shaft (50);

the shaft (50) being capable of entering into rotating condition if subjected to a drive torque that is greater than a sum of resistant torque exerted by an applied load and of a resulting braking torque exerted by the first magnets (2) of the first disc (1) facing/offset with respect to the second magnets (4) of the second disc (3) leading to an alternation of attraction between the discs (1, 3) when the portions of steel of the metal disc (3, 1) are facing the respective magnets (2, 4) of the opposite disc (1, 3), and an alternation of repulsion between the discs (1,3) when the magnets (2, 4) are frontally opposite, in this way producing an overall fluctuant/pulsating effect in which the repelling action dynamically overcomes the attracting action, enabling the discs (1, 3) to be maintained at a distance from each other.

3. The device according to claim 1, wherein the permanent magnets (2, 4) are arranged on facing sides of the respective discs (1, 3).

4. The device according to claim 1 wherein the peripheral seatings (2a, 4a) provided in the respective discs (1, 3) are arranged on circular rings.

5. The device according to claim 1 wherein a plurality of first peripheral seatings (2a) is arranged on the first disc (1) on concentric rings having diameters substantially similar to the rings on which the plurality of the corresponding second peripheral seatings (4a) provided on the second disc (3) is arranged.

6. The device according to claim 1 wherein the first disc (1) is geometrically coupled to the drive shaft (50).

7. The device according to claim 1 wherein the facing sides of the discs (1, 3) are provided with regions having a high coefficient of friction.

8. The device according to claim 1 further comprising elastic organs (40, 400) abutted by means (20, 200) associated to the shaft (50), or to guide means (60) fixed to the motor (5) casing and acting on the sliding disc (1, 3) in order to facilitate nearing or distancing thereof to/from the fixed disc (3, 1) and to reduce in this way vibrations of the device (100) during rotation.

9. The device according to claim 8, characterized in that the elastic organs (40) are coaxially slidable on the shaft (50).

10. The device of claim 8, wherein the guide means (60) comprise a plurality of pins (60) fixed to the motor (5) casing, orientated parallel to the shaft (50), destined to engage in corresponding through-seatings afforded in the sliding disc (3), with the elastic organs (400) slidable coaxially to the pins (60).

11. The device of claim 1 wherein the second fixed disc is made of the metal material and has the at least steel portions.

2. A magnetic braking device for use with a drive shaft of a motor comprising:

at least one first disc (1) fixedly mounted on the drive shaft (50) and provided with at least one series of first peripheral seatings (2a) arranged in a first ring, destined to receive first permanent magnets (2) of predetermined polarity;

at least one second disc (3) slidably mounted with respect to a casing of the motor (5) casing and provided with at least one series of second peripheral seatings (4a), arranged on a second ring geometrically similar to and facing the first ring on which the first seatings (2a) are arranged, the second peripheral seatings (4) being destined to receive corresponding second permanent magnets (4) having the same polarity as the first magnets (2);

at least one of the first or second discs (1, 3) being made of a metal material and having at least steel portions;

the first and second discs (1, 3) moving into reciprocal contact due to a magnetic attraction exerted by the at least steel portions of the metal disc (1, 3) which steel portions are interposed between successive peripheral seatings (2a, 4a) which attract the respective magnets (4, 2) of the opposite disc (3, 1) so as to enable establishing a braking condition of the shaft (50);

the shaft (50) being capable of entering into rotating condition if subjected to a drive torque that is greater than a sum of the resistant torque exerted by an applied load and of a resulting braking torque exerted by the first magnets (2) of the first disc (1) facing/offset with respect to the second magnets (4) of the second disc (3) leading to an alternation of attraction between the discs (1, 3) when the steel portions of the metal disc (1, 3) are facing the respective magnets (2, 4) of the facing disc (3, 1), and an alternation of repulsion between the discs (1, 3) when the magnets (2, 4) are frontally facing, in this way producing an overall fluctuant/pulsating effect in which the repelling action dynamically overcomes the attracting action, enabling the discs (1, 3) to be maintained at a distance from each other.

12. The device according to claim 2 wherein the permanent magnets (2, 4) are arranged on facing sides of the respective discs (1, 3).

13. The device according to claim 2 wherein the peripheral seatings (2a, 4a) provided in the respective discs (1, 3) are arranged on circular rings.

14. The device according to claim 2 wherein a plurality of first peripheral seatings (2a) is arranged on the first disc (1) on concentric rings having diameters substantially similar to the rings on which the plurality of the corresponding second peripheral seatings (4a) provided on the second disc (3) is arranged.

15. The device according to claim 2 wherein the first disc (1) is geometrically coupled to the drive shaft (50).

16. The device according to claim 2 wherein the facing sides of the discs (1, 3) are provided with regions having a high coefficient of friction.

17. The device according to claim 2 further comprising elastic organs (40, 400) abutted by means (20, 200) associated to the shaft (50), or to guide means (60) fixed to the motor (5) casing and acting on the sliding disc (1, 3) in order to facilitate nearing or distancing thereof to/from the fixed disc (3, 1) and to reduce vibrations of the device (100) during rotation.

18. The device according to claim 17, characterized in that the elastic organs (40) are coaxially slidable on the shaft (50).

19. The device of claim 17, wherein the guide means (60) comprise a plurality of pins (60) fixed to the motor (5) casing, orientated parallel to the shaft (50), destined to engage in corresponding through-seatings afforded in the sliding disc (3), with the elastic organs (400) slidable coaxially to the pins (60).

20. The device of claim 2 wherein the fixed first disc is made of the metal material and has the at least steel portions.