US20080213104A1 - Motor - Google Patents
Motor Download PDFInfo
- Publication number
- US20080213104A1 US20080213104A1 US12/081,185 US8118508A US2008213104A1 US 20080213104 A1 US20080213104 A1 US 20080213104A1 US 8118508 A US8118508 A US 8118508A US 2008213104 A1 US2008213104 A1 US 2008213104A1
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- US
- United States
- Prior art keywords
- shaft
- magnetic
- magnetic structure
- fan assembly
- disposed
- 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.)
- Abandoned
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
- F04D29/051—Axial thrust balancing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
- F04D25/0613—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator
- F04D25/062—Details of the bearings
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- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/04—Sliding-contact bearings for exclusively rotary movement for axial load only
- F16C17/08—Sliding-contact bearings for exclusively rotary movement for axial load only for supporting the end face of a shaft or other member, e.g. footstep bearings
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- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C39/00—Relieving load on bearings
- F16C39/06—Relieving load on bearings using magnetic means
- F16C39/063—Permanent magnets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/08—Structural association with bearings
- H02K7/09—Structural association with bearings with magnetic bearings
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- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2360/00—Engines or pumps
- F16C2360/46—Fans, e.g. ventilators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
Definitions
- the present invention relates to a motor, and in particular to a high power motor not utilizing bearings.
- a conventional motor comprises a shaft, a rotor, and a bearing.
- the rotor is disposed on the shaft and supported by the bearing, enabling the rotor to rotate smoothly.
- Mechanical components reducing friction and bearing loads in rotary and linear drives include ball and roller bearings, sleeve bushings, dynamic bearings, magnetic bearings, and other configurations.
- a ball bearing comprises an outer ring, an inner ring, and a plurality of metal balls disposed therebetween.
- the ball bearing is actuated by rolling of the metal balls. Only one contact point between the metal balls and the inner or outer ring allows easy acceleration of the motor.
- the structure of the ball bearing is weak and susceptible to impact.
- the motor with the ball bearing is operated, the balls roll at high speeds, resulting in producing high noise level.
- the structural interface between the balls and the inner and outer rings requires a high degree of accuracy, thus increasing manufacturing costs.
- a sleeve bearing is formed by mixing and sintering bronze powder, iron powder, nickel powder, lead powder and other metal powders. Lubricant is applied into the pores of the bearing.
- the sleeve bearing when disposed in a motor, is fastened in the central position of the stator.
- the shaft of the rotor is disposed in the bearing such that a gap is maintained between the bearing and the shaft.
- the lubricant exudes from the bearing such that the rotor rotates in the lubricant.
- This type of bearing can sustain higher impact than the ball bearing, and manufacturing costs are also reduced.
- the lubricant evaporates into gaseous phase as the bearing is operated over long periods.
- the shaft directly contacts the bearing such that friction is produced therebetween.
- nitrides can possibly form at the ends of the bearing, causing damage and increasing noise level.
- dust in the air may be drawn into the center of the motor during operation, contaminating the lubricant surrounding the bearing, increasing noise level and occluding moving parts.
- the gap between the bearing and the shaft is small, the efficiency in starting the motor is reduced.
- a dynamic bearing is a variation of the sleeve bearing.
- This type of bearing comprises an inner wall with two annular arrays of V-shaped grooves formed therein. During operation, air. and lubricant are impelled toward the pointed ends of the grooves forming two oil-gas cushions to support the shaft.
- the oil-gas cushion, formed at the pointed end of the V-shaped groove is unable to be dispersed or evaporated. Formation of the groove on the inner side of the dynamic bearing, however, requires precise manufacturing. Furthermore, the gap between the shaft and the bearing must be accurately maintained. Thus, the manufacturing cost is higher than other types of bearings.
- the oil-gas cushion is not formed. Thus, the dynamic effect is not achieved at low speeds, such that performance of the dynamic bearing is substantially the same as a sleeve bearing.
- a magnetic bearing has a plurality of N-S (north-south) magnetic poles formed on the shaft.
- the bearing corresponding to the shaft has the same N-S poles formed thereon.
- repellant force suspends the shaft in the bearing. Because there is no direct contact between the shaft and the bearing, neither noise nor friction is generated therebetween.
- the magnetic bearing must be designed with a gap of about 0.2 mm between the shaft and the bearing, such that balanced force toward the center point is generated by each portion of the bearing surrounding the shaft.
- the imbalance can cause shaft contact with the bearing. This increases noise, shortens lifetime, and can even interrupt normal operation of the motor.
- the magnetic bearing is based on magnetic balance, there are occasions that the motor cannot be smoothly started. Thus, the magnetic bearing is still in an experimental stage, as yet unable to be mass produced.
- an object of the present invention is to provide a motor minimizing problems associated with bearings.
- the present invention provides a motor comprising a stator, a rotor, a top magnetic structure, and a bottom magnetic structure.
- the stator and the rotor are disposed correspondingly in a frame.
- the rotor comprises a shaft, extending axially from the rotor. The shaft does not contact the stator or the frame.
- the bottom magnetic structure is disposed in the bottom of the frame.
- the top magnetic structure is disposed in the top of the frame.
- the magnetic structures are disposed opposite to each other in an axial direction. Magnetic attraction generated between the magnetic structures positions the shaft therebetween such that the first magnetic structure, the second magnetic structure, and the shaft are coaxially aligned.
- the shaft attracts or contacts the top magnetic structure, the bottom magnetic structure, or the magnetic structures.
- the motor includes at least one wear-resistant structure, disposed between the shaft and the bottom magnetic structure, the shaft and the top magnetic structure, or the shaft, the top, and the bottom magnetic structures. The shaft contacts the wear-resistant structure at a contact point.
- the motor further includes a magnetic structure encircling the rotor and a permeable structure encircling the stator and disposed corresponding to the magnetic structure encircling the rotor.
- the magnetic structure encircling the rotor includes a magnetic central plane, positioned slightly higher or lower than, or level with the magnetic central plane of the permeable structure in an axial direction.
- the shaft when the stator is covered by the rotor, the shaft extends through the central opening of the stator, and a protective structure is formed on a sidewall of the opening without directly contacting the shaft.
- the end surface of the shaft is selected from the group consisting of flat, curved, pointed, concave, convex, and combinations thereof, as is the end portion of the top or bottom magnetic structure facing the end surface of the shaft correspondingly.
- the shape of an end of the wear-resistant structure facing the axle shaft also corresponds to that of the shaft point.
- a plurality of blades surround the periphery of the rotor.
- the blades are centrifugal, planar, or axial.
- the frame comprises an upper cover and a lower cover, connected by fitting, engaging, gluing, locking, connecting via a cushion device, or combinations thereof and corresponding to each other.
- the upper and lower magnetic structures and the shaft are coaxial.
- the present invention also provides a motor, applicable in a fan assembly, comprising a stator, a rotor, a plurality of blades, and at least one magnetic structure.
- the stator is disposed on a base comprising at least one permeable structure.
- the rotor comprises a shaft.
- the shaft extends axially from the rotor.
- the magnetic structure encircles the rotor, corresponding to the permeable structure.
- the blades surround the periphery of the rotor, and the magnetic structure is fastened on the base via magnetic attraction to position the shaft.
- the magnetic structure contacts the shaft at a contact point.
- the magnetic central plane of the rotor is positioned substantially higher than the magnetic central plane of the stator.
- the rotor shaft contacts the stator at a contact point.
- buoyant force or lifting force is generated by airflow without making direct contact, thereby greatly reducing noise from the motor and increasing the lifetime.
- the motor of the present invention is operated via magnetic attraction of the shaft and buoyant force is generated during rotation by airflow, and thus, noise from the motor is reduced and lifetime is increased.
- the motor with a conventional bearing is replaced by the motor of the invention to eliminate components and reduce assembly costs thus minimizing manufacturing cost.
- FIG. 1 is a schematic diagram of a motor according to a first embodiment of the present invention
- FIG. 2 is a schematic diagram of a motor according to a second embodiment of the present invention.
- FIGS. 3A to 3D are local enlarged schematic diagrams of a shaft of the motor according to the present invention.
- FIG. 4 is a schematic diagram of a motor according to a third embodiment of the present invention.
- FIG. 5 is a schematic diagram of a motor according to a fourth embodiment of the present invention.
- FIG. 1 is a schematic diagram of a motor according to a first embodiment of the present invention.
- the motor 100 comprises a frame 102 , a stator 104 , a rotor 106 , and magnetic structures 108 and 110 .
- a shaft 116 extends axially from the rotor 106 .
- the shaft 116 and the magnetic structures 108 and 110 are aligned coaxially.
- the magnetic attraction is generated between the magnetic structures 108 and 110 and the shaft 116 .
- the frame 102 protects the motor 100 and internal elements thereof from external force.
- the frame 102 is either integrally formed or comprises an upper and a lower cover 102 a and 102 b .
- the frame 102 may also be formed by a plurality of divided portions (not shown).
- the covers 102 a and 120 b are connected by fitting, engaging, gluing, locking, or connecting via a cushion device.
- the upper and lower covers 102 a and 102 b are correspondingly engaged, for example, engaged by a hook, as shown in FIG. 1 .
- the stator 104 is disposed in the frame 102 to produce induced current or provide driving force for the rotor 106 .
- the stator 104 comprises a printed circuit board (not shown), a stator fixing base 112 , and at least a permeable structure 114 .
- the stator 104 does not contact the shaft 116 described later.
- the permeable structure 114 surrounds the base 112 and comprises a magnetic central plane P 1 .
- the permeable structure 114 can be a silicon steel plate or an electromagnet.
- the rotor 106 is movably disposed in the frame 102 , corresponding to the stator 104 .
- the rotor 106 comprises the shaft 116 , rotor 132 , at least one magnetic structure 118 , a permeable cover 120 .
- the shaft 116 comprises a flat, curved, pointed, concave, or convex end surface.
- the magnetic structure 118 comprises a magnetic central plane P 2 .
- the magnetic structure 118 corresponds to the permeable structure 114 .
- the magnetic central plane P 1 is positioned higher, level with, or lower than the magnetic central plane P 2 in the axial direction of the shaft.
- the magnetic structure 118 is a permanent magnet or a plastic magnet.
- the rotor 106 further comprises a plurality of blades for producing airflow around the motor 100 during rotation of the rotor 106 .
- the type of the blades 122 can be centrifugal, planar, or axial.
- the magnetic structures 108 and 110 are disposed on the bottom and the top of the frame 102 , respectively, corresponding to a respective end of the shaft.
- the magnetic structures 108 and 110 are permanent magnets, plastic magnets, or electromagnets.
- the two structures 108 and 110 can be connected and fastened on the frame 102 by gluing, fitting, engaging, or contacting.
- the surfaces of the magnetic structures 108 and 110 facing each other have opposite polarities therebetween.
- the surface of the magnetic structures 108 and 110 facing the shaft 116 and the end surface of the shaft 116 are curved, where the magnetic structures 108 and 110 contact the shaft 116 at a contact point.
- the surface shape can be flat, curved, pointed, concave, or convex.
- the magnetic structures 108 and 110 and the shaft 116 are coaxially maintained by the magnetic attraction therebetween such that the shaft 116 is positioned between the magnetic structures 108 and 110 .
- the shaft 116 also can only contact the magnetic structure 108 at a contact point, without contacting other elements.
- the shaft 116 also may only contact the other magnetic structure 110 at a contact point such that the rotor 106 is suspended in the frame 102 .
- the shaft 116 can also contact the magnetic structures 108 and 110 at a contact point simultaneously.
- wear-resistant structures 124 and 126 may be additionally disposed between the shaft 116 and the magnetic structures 108 and 110 .
- the shaft 116 only contacts the wear-resistant structures 124 and/or 126 at a contact point.
- the wear-resistant structures 124 and 126 are fixed onto the magnetic structures 108 and 110 respectively.
- the wear-resistant structures 124 and 126 can be formed on the magnetic structures 108 and 110 simultaneously or at the intersection between the shaft 116 and the magnetic structures. Put simply, the wear-resistant structure 124 is formed on the magnetic structure 108 , and the wear-resistant structure 126 is formed on the magnetic structure 110 .
- the wear-resistant structures 124 and 126 are formed thereon by gluing, engaging, fitting, contacting, or combinations thereof.
- the wear-resistant structures 124 and 126 can either directly contact or not contact the magnetic structures 108 and/or 110 and are coaxially aligned with the magnetic structures 108 and 110 .
- a protective structure 128 can be disposed on an opening 130 at an inner side of the stator fixing base 112 .
- the protective structure 128 does not contact the shaft 116 .
- the material of the protective structure 128 can be selected from the group consisting of plastic, flexible material, vibration absorbing material, and combinations thereof.
- FIG. 2 is a schematic diagram of a motor 200 according to a second embodiment of the present invention, from which elements common to the first embodiment are omitted. The difference is that only one magnetic structure 202 is used to attract the shaft 116 of the rotor 106 .
- the magnetic central plane P 2 of the magnetic structure 118 is higher than the magnetic central plane P 1 of the permeable structure 114 in an axial direction with respect to a base 208 .
- the magnetic structure 202 is entirely made of a magnetic material, or formed by a wear-resistant structure 206 and a magnetic body 204 .
- the surface between the magnetic structure 202 and the shaft 116 or the surface between the wear-resistant structure 206 and the shaft 116 is curved with a contact point therebetween.
- the surface of the magnetic structure 202 and/or the wear-resistant structure 206 is curved, pointed, concave, convex, or combinations thereof.
- the relationship between the shaft 116 and the magnetic structure 202 is the same as the above description.
- the surface of the magnetic structure 202 a or 202 b is curved or shaped in concave corresponding to the end of the shaft 116 a or 116 b as shown in FIG. 3A or 3 B.
- a curved end of a shaft 116 c is corresponding to a convex end of the protruding magnetic structure 202 c .
- the shaft 116 d has a differently shaped depression corresponding to the pointed magnetic structure 202 d.
- FIG. 4 is a schematic diagram of a motor 300 according to a third embodiment of the present invention, from which elements common to said embodiments are omitted.
- a magnetic structure 304 is disposed on the top of the stator fixing base 112
- a magnetic structure 302 is formed on the rotor hub 132 .
- the magnetic structures 302 and 304 are attracted to each other without making contact.
- the magnetic structure 304 does not contact the permeable structure 114 and is positioned higher than the permeable structure 114 in an axial direction.
- the magnetic structure 302 is a circular, fan-shaped, block-shaped, or rectangular structure. The shape and position of the magnetic structure 302 correspond to those of the magnetic structure 304 .
- the magnetic structure 304 and the stator fixing base 112 are connected by gluing, fitting, engaging, contacting, or combinations thereof.
- the magnetic structure 302 and the rotor hub 132 are also connected by gluing, fitting, engaging, contacting, or combinations thereof.
- FIG. 5 is a schematic diagram of a motor 400 according to a fourth embodiment of the present invention, from which elements common to said embodiments are omitted. The difference is that there is only one magnetic structure 402 formed on an upper cover 102 a of the frame 102 .
- the magnetic central plane P 2 of the magnetic structure 118 is lower than the magnetic central plane PI of the permeable structure 114 in an axial direction.
- a wear-resistant structure 408 is disposed at a lower cover 102 b.
- the magnetic structure 402 is entirely made of a magnetic material, or formed by a wear-resistant structure 406 and a magnetic body 404 .
- the surface between the magnetic structure 402 and the shaft 116 , the surface between the wear-resistant structure 406 and the shaft 116 , and/or the surface between the wear-resistant structure 408 and the shaft 116 is a curved surface with a contact point therebetween.
- the surface shape of the magnetic structure 402 and/or the wear-resistant structures 406 , 408 is curved, pointed, concave, convex, or combinations thereof.
- the motor described above is applied in an axial flow fan.
- the present invention is not limited to the disclosed fan.
- the motor is also applicable in other fans such as frameless, centrifugal, outer-rotor, or inner-rotor fan.
- the shaft of the rotor has only one point of contact with the stator or no contact therebetween when buoyant airflow force is generated during rotation.
- the noise level of the motor is greatly reduced and lifetime is increased.
- the motor of the present invention generates buoyant force by magnetic attraction from the shaft during operation such that the shaft does not contact other elements thus reducing noise and increasing the lifetime of the motor.
- the motor of the present invention does not require the conventional bearing, thus reducing the number of elements in the motor, thereby minimizing the manufacturing cost.
Abstract
A motor includes a stator, a rotor, a top magnetic structure, and a bottom magnetic structure. The stator is disposed in a frame. The rotor is also disposed in the frame, corresponding to the stator. The rotor includes a shaft extending axially from the rotor. The bottom magnetic structure is at the bottom of the frame. The top magnetic structure is on the top of the frame. The top and bottom magnetic structures are opposite to each other in an axial direction. Magnetic attraction generated between the first magnetic structure and the shaft, and the second magnetic structure and the shaft positions the shaft therebetween such that the first magnetic structure, the second magnetic structure, and the shaft are coaxially aligned.
Description
- This Non-provisional application is a Continuation Application claiming the benefit of U.S. Non-provisional Application No. 10/878,114 filed on Jun. 29, 2004, and for which priority is claimed under 35 U.S.C. § 120; and this application claims priority of Application No. 092122447 filed in Taiwan Aug. 15, 2003 under 35 U.S.C. § 119; the entire contents of all are hereby incorporated herein by reference.
- 1. Field of the Invention
- The present invention relates to a motor, and in particular to a high power motor not utilizing bearings.
- 2. Description of the Related Art
- A conventional motor comprises a shaft, a rotor, and a bearing. The rotor is disposed on the shaft and supported by the bearing, enabling the rotor to rotate smoothly.
- Mechanical components reducing friction and bearing loads in rotary and linear drives include ball and roller bearings, sleeve bushings, dynamic bearings, magnetic bearings, and other configurations.
- A ball bearing comprises an outer ring, an inner ring, and a plurality of metal balls disposed therebetween. The ball bearing is actuated by rolling of the metal balls. Only one contact point between the metal balls and the inner or outer ring allows easy acceleration of the motor. The structure of the ball bearing, however, is weak and susceptible to impact. In addition, when the motor with the ball bearing is operated, the balls roll at high speeds, resulting in producing high noise level. The structural interface between the balls and the inner and outer rings requires a high degree of accuracy, thus increasing manufacturing costs.
- A sleeve bearing is formed by mixing and sintering bronze powder, iron powder, nickel powder, lead powder and other metal powders. Lubricant is applied into the pores of the bearing. The sleeve bearing, when disposed in a motor, is fastened in the central position of the stator. The shaft of the rotor is disposed in the bearing such that a gap is maintained between the bearing and the shaft. When the motor is operated, the lubricant exudes from the bearing such that the rotor rotates in the lubricant. This type of bearing can sustain higher impact than the ball bearing, and manufacturing costs are also reduced. In a motor utilizing the sleeve bearing, however, the lubricant evaporates into gaseous phase as the bearing is operated over long periods. As a result, the shaft directly contacts the bearing such that friction is produced therebetween. Furthermore, nitrides can possibly form at the ends of the bearing, causing damage and increasing noise level. In addition, dust in the air may be drawn into the center of the motor during operation, contaminating the lubricant surrounding the bearing, increasing noise level and occluding moving parts. Furthermore, since the gap between the bearing and the shaft is small, the efficiency in starting the motor is reduced.
- A dynamic bearing is a variation of the sleeve bearing. This type of bearing comprises an inner wall with two annular arrays of V-shaped grooves formed therein. During operation, air. and lubricant are impelled toward the pointed ends of the grooves forming two oil-gas cushions to support the shaft. In a motor with this type of bearing, the oil-gas cushion, formed at the pointed end of the V-shaped groove, is unable to be dispersed or evaporated. Formation of the groove on the inner side of the dynamic bearing, however, requires precise manufacturing. Furthermore, the gap between the shaft and the bearing must be accurately maintained. Thus, the manufacturing cost is higher than other types of bearings. Moreover, when the motor operates at low speed, the oil-gas cushion is not formed. Thus, the dynamic effect is not achieved at low speeds, such that performance of the dynamic bearing is substantially the same as a sleeve bearing.
- A magnetic bearing has a plurality of N-S (north-south) magnetic poles formed on the shaft. The bearing corresponding to the shaft has the same N-S poles formed thereon. During operation, repellant force suspends the shaft in the bearing. Because there is no direct contact between the shaft and the bearing, neither noise nor friction is generated therebetween. The magnetic bearing, however, must be designed with a gap of about 0.2 mm between the shaft and the bearing, such that balanced force toward the center point is generated by each portion of the bearing surrounding the shaft. However, if the position of the shaft is offset by external force or driving force during operation, the imbalance can cause shaft contact with the bearing. This increases noise, shortens lifetime, and can even interrupt normal operation of the motor.
- Furthermore, since the magnetic bearing is based on magnetic balance, there are occasions that the motor cannot be smoothly started. Thus, the magnetic bearing is still in an experimental stage, as yet unable to be mass produced.
- Accordingly, an object of the present invention is to provide a motor minimizing problems associated with bearings.
- The present invention provides a motor comprising a stator, a rotor, a top magnetic structure, and a bottom magnetic structure. The stator and the rotor are disposed correspondingly in a frame. The rotor comprises a shaft, extending axially from the rotor. The shaft does not contact the stator or the frame. The bottom magnetic structure is disposed in the bottom of the frame. The top magnetic structure is disposed in the top of the frame. The magnetic structures are disposed opposite to each other in an axial direction. Magnetic attraction generated between the magnetic structures positions the shaft therebetween such that the first magnetic structure, the second magnetic structure, and the shaft are coaxially aligned.
- According to the motor of the present invention, the shaft attracts or contacts the top magnetic structure, the bottom magnetic structure, or the magnetic structures. Furthermore, the motor includes at least one wear-resistant structure, disposed between the shaft and the bottom magnetic structure, the shaft and the top magnetic structure, or the shaft, the top, and the bottom magnetic structures. The shaft contacts the wear-resistant structure at a contact point.
- Accordingly, the motor further includes a magnetic structure encircling the rotor and a permeable structure encircling the stator and disposed corresponding to the magnetic structure encircling the rotor. The magnetic structure encircling the rotor includes a magnetic central plane, positioned slightly higher or lower than, or level with the magnetic central plane of the permeable structure in an axial direction.
- Furthermore, in the present invention, when the stator is covered by the rotor, the shaft extends through the central opening of the stator, and a protective structure is formed on a sidewall of the opening without directly contacting the shaft.
- In addition, the end surface of the shaft is selected from the group consisting of flat, curved, pointed, concave, convex, and combinations thereof, as is the end portion of the top or bottom magnetic structure facing the end surface of the shaft correspondingly. Moreover, the shape of an end of the wear-resistant structure facing the axle shaft also corresponds to that of the shaft point.
- In the motor of the invention, a plurality of blades surround the periphery of the rotor. The blades are centrifugal, planar, or axial. The frame comprises an upper cover and a lower cover, connected by fitting, engaging, gluing, locking, connecting via a cushion device, or combinations thereof and corresponding to each other.
- Accordingly, the upper and lower magnetic structures and the shaft are coaxial.
- The present invention also provides a motor, applicable in a fan assembly, comprising a stator, a rotor, a plurality of blades, and at least one magnetic structure. The stator is disposed on a base comprising at least one permeable structure. The rotor comprises a shaft. The shaft extends axially from the rotor. The magnetic structure encircles the rotor, corresponding to the permeable structure. The blades surround the periphery of the rotor, and the magnetic structure is fastened on the base via magnetic attraction to position the shaft. The magnetic structure contacts the shaft at a contact point. The magnetic central plane of the rotor is positioned substantially higher than the magnetic central plane of the stator.
- As a result, the rotor shaft contacts the stator at a contact point. During operation, buoyant force or lifting force is generated by airflow without making direct contact, thereby greatly reducing noise from the motor and increasing the lifetime.
- Moreover, the motor of the present invention is operated via magnetic attraction of the shaft and buoyant force is generated during rotation by airflow, and thus, noise from the motor is reduced and lifetime is increased. The motor with a conventional bearing is replaced by the motor of the invention to eliminate components and reduce assembly costs thus minimizing manufacturing cost.
- Further scope of the applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
- The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention, and wherein:
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FIG. 1 is a schematic diagram of a motor according to a first embodiment of the present invention; -
FIG. 2 is a schematic diagram of a motor according to a second embodiment of the present invention; -
FIGS. 3A to 3D are local enlarged schematic diagrams of a shaft of the motor according to the present invention; -
FIG. 4 is a schematic diagram of a motor according to a third embodiment of the present invention; -
FIG. 5 is a schematic diagram of a motor according to a fourth embodiment of the present invention. -
FIG. 1 is a schematic diagram of a motor according to a first embodiment of the present invention. Themotor 100 comprises aframe 102, astator 104, arotor 106, andmagnetic structures shaft 116 extends axially from therotor 106. Theshaft 116 and themagnetic structures motor 100, the magnetic attraction is generated between themagnetic structures shaft 116. - The
frame 102 protects themotor 100 and internal elements thereof from external force. Theframe 102 is either integrally formed or comprises an upper and alower cover frame 102 may also be formed by a plurality of divided portions (not shown). Thecovers 102 a and 120 b are connected by fitting, engaging, gluing, locking, or connecting via a cushion device. Furthermore, the upper andlower covers FIG. 1 . - The
stator 104 is disposed in theframe 102 to produce induced current or provide driving force for therotor 106. Thestator 104 comprises a printed circuit board (not shown), astator fixing base 112, and at least apermeable structure 114. Thestator 104 does not contact theshaft 116 described later. Thepermeable structure 114 surrounds thebase 112 and comprises a magnetic central plane P1. Thepermeable structure 114 can be a silicon steel plate or an electromagnet. - The
rotor 106 is movably disposed in theframe 102, corresponding to thestator 104. Therotor 106 comprises theshaft 116,rotor 132, at least onemagnetic structure 118, apermeable cover 120. Theshaft 116 comprises a flat, curved, pointed, concave, or convex end surface. - The
magnetic structure 118 comprises a magnetic central plane P2. Themagnetic structure 118 corresponds to thepermeable structure 114. The magnetic central plane P1 is positioned higher, level with, or lower than the magnetic central plane P2 in the axial direction of the shaft. Themagnetic structure 118 is a permanent magnet or a plastic magnet. - In addition, the
rotor 106 further comprises a plurality of blades for producing airflow around themotor 100 during rotation of therotor 106. The type of theblades 122 can be centrifugal, planar, or axial. - The
magnetic structures frame 102, respectively, corresponding to a respective end of the shaft. Themagnetic structures structures frame 102 by gluing, fitting, engaging, or contacting. The surfaces of themagnetic structures magnetic structures shaft 116 and the end surface of theshaft 116 are curved, where themagnetic structures shaft 116 at a contact point. The surface shape can be flat, curved, pointed, concave, or convex. - The
magnetic structures shaft 116 are coaxially maintained by the magnetic attraction therebetween such that theshaft 116 is positioned between themagnetic structures motor 100 is idle, theshaft 116 also can only contact themagnetic structure 108 at a contact point, without contacting other elements. - Furthermore, the
shaft 116 also may only contact the othermagnetic structure 110 at a contact point such that therotor 106 is suspended in theframe 102. - Moreover, the
shaft 116 can also contact themagnetic structures - To further increase the lifetime of the
motor 100, wear-resistant structures shaft 116 and themagnetic structures shaft 116 only contacts the wear-resistant structures 124 and/or 126 at a contact point. The wear-resistant structures magnetic structures resistant structures magnetic structures shaft 116 and the magnetic structures. Put simply, the wear-resistant structure 124 is formed on themagnetic structure 108, and the wear-resistant structure 126 is formed on themagnetic structure 110. The wear-resistant structures resistant structures magnetic structures 108 and/or 110 and are coaxially aligned with themagnetic structures - Furthermore, to prevent damage on the
motor 100 due to impact between theshaft 116 and thestator fixing base 112 during transport, aprotective structure 128 can be disposed on anopening 130 at an inner side of thestator fixing base 112. Theprotective structure 128 does not contact theshaft 116. The material of theprotective structure 128 can be selected from the group consisting of plastic, flexible material, vibration absorbing material, and combinations thereof. -
FIG. 2 is a schematic diagram of amotor 200 according to a second embodiment of the present invention, from which elements common to the first embodiment are omitted. The difference is that only onemagnetic structure 202 is used to attract theshaft 116 of therotor 106. The magnetic central plane P2 of themagnetic structure 118 is higher than the magnetic central plane P1 of thepermeable structure 114 in an axial direction with respect to abase 208. - In this embodiment, the
magnetic structure 202 is entirely made of a magnetic material, or formed by a wear-resistant structure 206 and amagnetic body 204. Moreover, the surface between themagnetic structure 202 and theshaft 116 or the surface between the wear-resistant structure 206 and theshaft 116 is curved with a contact point therebetween. The surface of themagnetic structure 202 and/or the wear-resistant structure 206 is curved, pointed, concave, convex, or combinations thereof. The relationship between theshaft 116 and themagnetic structure 202 is the same as the above description. - When an end of a
shaft magnetic structure shaft FIG. 3A or 3B. - Furthermore, as shown in
FIG. 3C , a curved end of ashaft 116 c is corresponding to a convex end of the protrudingmagnetic structure 202 c. Similarly, as shown inFIG. 3D , theshaft 116 d has a differently shaped depression corresponding to the pointedmagnetic structure 202 d. -
FIG. 4 is a schematic diagram of amotor 300 according to a third embodiment of the present invention, from which elements common to said embodiments are omitted. The difference is that amagnetic structure 304 is disposed on the top of thestator fixing base 112, and amagnetic structure 302 is formed on therotor hub 132. Themagnetic structures magnetic structure 304 does not contact thepermeable structure 114 and is positioned higher than thepermeable structure 114 in an axial direction. Themagnetic structure 302 is a circular, fan-shaped, block-shaped, or rectangular structure. The shape and position of themagnetic structure 302 correspond to those of themagnetic structure 304. - Furthermore, the
magnetic structure 304 and thestator fixing base 112 are connected by gluing, fitting, engaging, contacting, or combinations thereof. Themagnetic structure 302 and therotor hub 132 are also connected by gluing, fitting, engaging, contacting, or combinations thereof. -
FIG. 5 is a schematic diagram of amotor 400 according to a fourth embodiment of the present invention, from which elements common to said embodiments are omitted. The difference is that there is only onemagnetic structure 402 formed on anupper cover 102 a of theframe 102. The magnetic central plane P2 of themagnetic structure 118 is lower than the magnetic central plane PI of thepermeable structure 114 in an axial direction. Moreover, a wear-resistant structure 408 is disposed at alower cover 102 b. - In this embodiment, the
magnetic structure 402 is entirely made of a magnetic material, or formed by a wear-resistant structure 406 and amagnetic body 404. Moreover, the surface between themagnetic structure 402 and theshaft 116, the surface between the wear-resistant structure 406 and theshaft 116, and/or the surface between the wear-resistant structure 408 and theshaft 116 is a curved surface with a contact point therebetween. The surface shape of themagnetic structure 402 and/or the wear-resistant structures - The motor described above is applied in an axial flow fan. The present invention, however, is not limited to the disclosed fan. The motor is also applicable in other fans such as frameless, centrifugal, outer-rotor, or inner-rotor fan.
- In the above embodiments, the shaft of the rotor has only one point of contact with the stator or no contact therebetween when buoyant airflow force is generated during rotation. Thus, the noise level of the motor is greatly reduced and lifetime is increased.
- Furthermore, the motor of the present invention generates buoyant force by magnetic attraction from the shaft during operation such that the shaft does not contact other elements thus reducing noise and increasing the lifetime of the motor.
- The motor of the present invention does not require the conventional bearing, thus reducing the number of elements in the motor, thereby minimizing the manufacturing cost.
- While the invention has been described by way of example and in terms of the preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. To the contrary, it is intended to cover various modifications and similar arrangements (as would be apparent to those skilled in the art). Therefore, the scope of the appended claims should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements.
Claims (20)
1. A fan assembly comprising:
a stator disposed in a frame;
a rotor disposed in the frame and corresponding to the stator and comprising a shaft without any sleeve, hydrodynamic, ceramic or ball supports;
at least one first magnetic structure disposed at a bottom of the frame; and
at least one second magnetic structure disposed in the frame;
wherein magnetic interaction generated between the first magnetic structure and the shaft, and the second magnetic structure and the shaft positions the shaft therebetween such that the first magnetic structure, the second magnetic structure, and the shaft are coaxially aligned.
2. The fan assembly as claimed in claim 1 , wherein the first magnetic structure and the second magnetic structure disposed opposite to each other in an axial direction.
3. The fan assembly as claimed in claim 1 , wherein the shaft directly contacts or magnetically attracts with the first magnetic structure or/and the second magnetic structure.
4. The fan assembly as claimed in claim 1 , further comprising at least one wear-resistant structure disposed between the shaft and the first magnetic structure, and the shaft and the second magnetic structure.
5. The fan assembly as claimed in claim 4 , wherein the shaft directly contacts the wear-resistant structure at a contact point.
6. The fan assembly as claimed in claim 1 , wherein a polarity of a side of the first magnetic structure facing the second magnetic structure is opposite to a polarity of a side of the second magnetic structure facing the first magnetic structure.
7. The fan assembly as claimed in claim 1 , wherein the rotor comprises at least one third magnetic structure with a first magnetic central plane, and the stator comprises at least one permeable structure with a second magnetic central plane corresponding to the third magnetic structure, wherein the first magnetic central plane is disposed slightly above or below the second magnetic central plane in an axial direction of the shaft.
8. The fan assembly as claimed in claim 1 , wherein the stator further comprises an opening defined at the center thereof with the shaft extended therein, and a protective structure disposed on a sidewall of the opening without contacting the shaft.
9. The fan assembly as claimed in claim 8 , wherein the protective structure is made of plastic, flexible material or vibration absorbing material.
10. The fan assembly as claimed in claim 1 , wherein an end surface of the shaft has a flat, curved, pointed, concave or convex shape, and the first magnetic structure and the second magnetic structure have end portions, each of the end portions, facing the shaft, with a curved, pointed, concave or convex shape corresponding to that of the end surface of the shaft.
11. The fan assembly as claimed in claim 1 , wherein when the shaft contacts the first and the second magnetic structures, the shape of the end surface of the shaft corresponds to the end portions of the first magnetic structure, the second magnetic structure or both.
12. The fan assembly as claimed in claim 4 , wherein an end surface of the shaft has a flat, curved, pointed, concave or convex shape, and the wear-resistant structure has an end, facing the shaft, with a flat, curved, pointed, concave or convex shape corresponding to that of the end surface of the shaft.
13. The fan assembly as claimed in claim 4 , wherein when the shaft contacts the wear-resistant structure at a contact point, the shape of the end surface of the shaft corresponds to the shape of the end of the wear-resistance.
14. The fan assembly as claimed in claim 1 , wherein the first or the second magnetic structures is a permanent magnet, a plastic magnet or an electromagnet.
15. The fan assembly as claimed in claim 1 , wherein the frame comprises an upper cover and a lower cover corresponding to each other and connected by fitting, engaging, gluing, locking or connecting via a cushion device.
16. A fan assembly comprising:
a base;
a stator disposed on the base;
a rotor coupled to the stator and having a shaft;
a first magnetic structure disposed at a bottom of the base and positioned under the shaft to generate a magnetic interaction between the shaft and the first magnetic structure.
17. The fan assembly as claimed in claim 16 , further comprising a second magnetic structure disposed at a top of the base, and a third magnetic structure disposed inside a hub of the rotor to generate a magnetic interaction between the second and third magnetic structures.
18. The fan assembly as claimed in claim 16 , further comprising a protective structure disposed in an axial tube of the base and around the shaft.
19. The fan assembly as claimed in claim 16 , further comprising a wear-resistant structure disposed between an end of the shaft and the first magnetic structure.
20. The fan assembly as claimed in claim 19 , wherein the end of the shaft has a shape corresponding to that of the first magnetic structure or the wear-resistant structure so as to form a point contact therebetween.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/081,185 US20080213104A1 (en) | 2003-08-15 | 2008-04-11 | Motor |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW92122447 | 2003-08-15 | ||
TW092122447A TWI222263B (en) | 2003-08-15 | 2003-08-15 | Non-bearing motor |
US10/878,114 US7417345B2 (en) | 2003-08-15 | 2004-06-29 | Fan assembly with magnetic thrust bearings |
US12/081,185 US20080213104A1 (en) | 2003-08-15 | 2008-04-11 | Motor |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/878,114 Continuation US7417345B2 (en) | 2003-08-15 | 2004-06-29 | Fan assembly with magnetic thrust bearings |
Publications (1)
Publication Number | Publication Date |
---|---|
US20080213104A1 true US20080213104A1 (en) | 2008-09-04 |
Family
ID=34132836
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/878,114 Expired - Fee Related US7417345B2 (en) | 2003-08-15 | 2004-06-29 | Fan assembly with magnetic thrust bearings |
US12/081,185 Abandoned US20080213104A1 (en) | 2003-08-15 | 2008-04-11 | Motor |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/878,114 Expired - Fee Related US7417345B2 (en) | 2003-08-15 | 2004-06-29 | Fan assembly with magnetic thrust bearings |
Country Status (2)
Country | Link |
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US (2) | US7417345B2 (en) |
TW (1) | TWI222263B (en) |
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CN102808802A (en) * | 2011-06-03 | 2012-12-05 | 深圳市顺合泰电机有限公司 | Oily fan with magnetic attraction function |
US20140203450A1 (en) * | 2013-01-23 | 2014-07-24 | Amtek Semiconductors Co., Ltd. | Semiconductor package and method of fabricating the same |
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JP2012013022A (en) * | 2010-07-01 | 2012-01-19 | Nippon Densan Corp | Blower fan |
US9341192B2 (en) | 2011-03-04 | 2016-05-17 | Apple Inc. | Compact fan assembly with thrust bearing |
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CN102808802A (en) * | 2011-06-03 | 2012-12-05 | 深圳市顺合泰电机有限公司 | Oily fan with magnetic attraction function |
US20140203450A1 (en) * | 2013-01-23 | 2014-07-24 | Amtek Semiconductors Co., Ltd. | Semiconductor package and method of fabricating the same |
US9390959B2 (en) * | 2013-01-23 | 2016-07-12 | Amtek Semiconductors Co., Ltd. | Semiconductor package with stator set formed by circuits |
US9679826B2 (en) | 2013-01-23 | 2017-06-13 | Amtek Semiconductors Co., Ltd. | Method for fabricating semiconductor package with stator set formed by circuits |
Also Published As
Publication number | Publication date |
---|---|
US20050035670A1 (en) | 2005-02-17 |
TWI222263B (en) | 2004-10-11 |
TW200507422A (en) | 2005-02-16 |
US7417345B2 (en) | 2008-08-26 |
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