JP2006246627A - Equilibrium structure of rotor in motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the equilibrium structure of a rotor in a motor which can keep the balance of rotation of the rotor and the stability of start and secure the efficiency of rotation and further can effectively extend the service life of the motor. <P>SOLUTION: This equilibrium structure is composed of the first balancing magnet and the second balancing magnet. The first balancing magnet and the second balancing magnet are arranged in the proper positions of a fixed part and the rotor so that they may correspond to each other, and further they are so made as to have different polarity at the adjacent surfaces of the first balancing magnet and the second balancing magnet, whereby the surfaces of the first balancing magnet and the second balancing magnet magnetically attract each other so that they may correspond to each other in its axial direction, and also they are registered, magnetically attracting each other initiatively in its diametrical direction, thus it is constituted so that it may effectively keep the balance in rotation of the rotor and the stability in start. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a balanced structure of a rotor of a motor, and in particular, the fixed portion and the rotor have a corresponding magnetic attraction and radial direction corresponding to the axial directions formed by the different magnetic polarities of the first balanced magnet and the second balanced magnet. It is related to the equilibrium structure which maintains the rotational stability of the rotor by utilizing the magnetic attraction alignment of the rotor.

  As shown in FIG. 6, the conventional motor balance structure of the rotor includes a fixed portion 10, a rotor 20, and a sensitive metal piece 201. The fixed portion 10 is provided with a base 11, a shaft tube 12, a bearing 13 and a stator 14. The shaft tube 12 is fixed to the base 11, and the shaft tube 12 can accommodate a bearing 13. The stator 14 is provided with a plurality of magnetic pole pieces 141. The rotor 20 is provided with a shaft rod 21 and an annular magnet 22. The shaft rod 21 is provided inside the bearing 13, and the annular magnet 22 of the rotor 20 is formed so as to surround the magnetic pole surface of the magnetic pole piece 141 of the stator 14. The sensitive metal piece 201 is located on the inner surface of the rotor 20 and is formed to correspond to the upper surface of the pole piece 141. When the motor is operated, the rotation of the rotor 20 is pushed by the alternating excitation of the magnetic pole piece 141, and at the same time, the sensitive metal piece 201 is also attracted by the alternating excitation of the magnetic pole piece 141, thereby Since it can help to maintain the balance of rotation, the rotor 20 can be prevented from being detached from the stator 14, the wear of the rotation of the bearing 13 can be relatively reduced, and the motor In some cases, the service life can be extended (see, for example, Patent Document 1).

  Further, as a conventional balanced structure of the rotor of the motor, the sensitive metal piece is provided at the bottom of the stator, and the sensitive metal piece is formed so as to correspond to the bottom edge of the annular magnet of the rotor. There are some which can increase the balance of the rotation of the rotor by magnetically attracting the sensitive metal piece by use (see, for example, Patent Documents 2, 3, 4, 5, and 6).

  In addition, as a balanced structure of a conventional rotor of a motor, a prestressed magnet is appropriately provided on a magnetic pole piece of a stator using a positioning member, and the prestressed magnet is formed so as to be magnetically attracted corresponding to the metal shell of the rotor. By doing so, there is one that can increase the balance of rotation of the rotor (see, for example, Patent Document 7).

Further, the conventional rotor balance structure of the motor is applied to an inner rotor type or an outer rotor type motor. In the motor, a balanced conductive piece and a balanced magnet ring are respectively connected to the bottom end of the stator assembly or the bottom end of the rotor. Some of them are provided, and the balanced magnet ring is magnetically attracted in correspondence with the balanced conductive piece, so that the balance of the rotation of the rotor can be increased (for example, Patent Documents 8 and 9). reference).
Republic of China Notification No. 383818 Republic of China Notification No. 423760 Republic of China Notification No. 422365 Republic of China Notification No. 428838 Republic of China Notification No. 539355 Republic of China No. 501823 Republic of China Notification No. 562330 Republic of China Notification No. 513012 Republic of China Notice Number M243848

  The above-described conventional balanced structure of the rotor of the motor actually has the following problems. For example, a) Since the sensitive metal piece 201 directly attracts the sensitive metal piece 201 using the alternating excitation of the magnetic pole piece 141, the magnetic pole piece 141 may cause magnetic leakage. The relative efficiency of excitation is reduced. b) When the size of the sensitive metal piece 201 is too large, the total load of the rotor 20 is relatively increased, so that the rotational speed of the rotor 20 is relatively decreased. c) Since the magnetic pole piece 141 cannot magnetically attract the sensitive metal piece 201 before the motor is started, the rotor 20 can be prevented from being unbalanced due to temporary rotation at the moment of starting the motor. Therefore, after use for a long period of time, the bearing 13 will be worn away by rotation. d) Since the magnetic pole piece 141 can magnetically attract the sensitive metal piece 201 only in the primary direction, that is, it can only provide the balance action by the axial direction, the balance effect by the rotation is limited.

  Further, in the conventional balanced structure of the rotor of the motor as described above, the sensitive metal piece directly uses the magnetic force of the annular magnet of the rotor to maintain the balance of rotation. There was a problem of affecting the efficiency of alternating excitation. Further, since the annular magnet can substantially magnetically attract the sensitive metal piece only in the primary direction, that is, it can provide only the balance action by the axial direction, the balance effect of the rotation by the radial direction is still limited. ing. In other words, when the rotation of the rotor shifts due to the radial direction, the rotor is mainly guided and recovered to the correct radial position even if the sensing metal piece is magnetically attracted by simply requesting an annular magnet. There was a problem that it could not be made.

  Moreover, in the conventional rotor balanced structure of the motor as described above, the prestressed magnet can be applied only to a rotor having a metal shell, for example, only to a spindle motor of a CD drive. In a small brushless DC motor rotor molded by injection molding with a plastic material, the prestressed magnet cannot be magnetically attracted corresponding to the inner surface of the rotor. Further, since the magnetic force of a prestressed magnet having a relatively small size is limited, there is a problem that a metal shell having a relatively large size cannot be magnetically attracted effectively. Furthermore, since the prestressed magnet can magnetically attract the metal shell only in the primary direction, that is, it can only provide the balance action by the axial direction, the balance effect of the rotation by the radial direction is still limited. In other words, when the rotor shifts in the radial direction, even if the pre-stressed magnet is requested and the sensitive metal piece is magnetically attracted, the rotor is mainly guided and recovered to the correct radial position. There was a problem that it could not be made.

  Further, in the conventional balanced structure of the rotor of the motor as described above, the balanced magnet ring is provided apart from the annular magnet of the rotor, but the balanced magnet ring or the balanced conductive piece is still only supported in the primary direction. Thus, the magnetic attraction cannot be formed, that is, only the balance action by the axial direction can be provided, so the balance effect of the rotation by the radial direction is still limited. In other words, when the rotor shifts in the radial direction, even if it is simply requested for the balanced magnet ring and magnetically attracted to the balanced magnetic piece, the rotor is guided mainly and the correct radial position is obtained. There was a problem that it could not be recovered. As described above, on the basis of the problems of the conventional various rotation techniques, it is necessary to further improve the balance structure of the rotors of the various conventional motors.

  The present invention has been invented in view of such problems. The object of the present invention is to provide a first balanced magnet in the fixed portion and a second balanced magnet to correspond to the rotor. The first balanced magnet and the second balanced magnet have different magnetic polarities and provide a double balanced effect in the secondary direction by the magnetic attraction corresponding to the axial direction and the magnetic attraction in the radial direction. It is intended to provide a balance structure of the rotor of the motor that can maintain the balance of the rotation of the rotor and the stability of the start, ensure the efficiency of the rotation, and also effectively extend the service life of the motor. is there.

  The first object of the present invention is to provide a first balanced magnet and a second balanced magnet so as to correspond to the fixed portion and the rotor, and the first balanced magnet and the second balanced magnet have appropriate different magnetic polarities. Since the magnetic attraction corresponding to the axial direction and the magnetic attraction in the radial direction are formed with a magnetic force, a rotor rotor balance structure that can maintain the balance of rotor rotation and start-up stability is provided. It is something to try.

  The second object of the present invention is to provide a first balanced magnet at the upper end of the shaft tube of the fixed portion, and further provide a second balanced magnet to correspond to the shaft seat of the rotor. Since the second balanced magnet is formed so as to be correspondingly magnetically attracted with appropriate different magnetic polarities, the balance of the rotor rotation and the stability of the starting of the motor can be maintained. It is intended to provide a balanced structure.

  The third object of the present invention is to provide a first balanced magnet at the base of the fixed portion, and a corresponding second balanced magnet at the bottom of the annular magnet inside the rotor. Since the magnet and the second balanced magnet are formed so as to be correspondingly magnetically attracted with appropriate different magnetic polarities, the rotation of the rotor and the stability of the starting can be maintained. It is intended to provide a balanced structure for the rotor.

In order to achieve the above object, the balanced structure of the rotor of the motor according to the present invention is as follows. That is,
The stationary part is constituted by at least one first balanced magnet, a rotor, and at least one second balanced magnet. A base is provided on the fixed portion, and the stator can be supported by the base. The first balanced magnet is fixed to the fixed part, and at least one surface is formed on the first balanced magnet. The rotor is provided with a shaft rod and an annular magnet, and can be coupled to the stator so as to be rotatable by the shaft rod. The annular magnet is provided on the inner peripheral surface of the rotor. The second balanced magnet is fixed to the rotor, and at least one surface is formed on the second balanced magnet, and the surface of the second balanced magnet is formed to correspond to the surface of the first balanced magnet. Furthermore, the surface of the first balanced magnet and the surface of the second balanced magnet are formed to have different magnetic polarities, so that the surfaces of the first balanced magnet and the second balanced magnet correspond in the axial direction. In addition to the magnetic attraction and the magnetic attraction in the radial direction for alignment, the balance of rotation of the rotor can be effectively maintained.

  In the balance structure of the rotor of the motor according to the present invention, the fixed portion may be provided with a shaft tube, and the first balanced magnet may be fixed to the upper end of the fixed portion of the shaft tube. In addition, the first balanced magnet can be fixed to the shoulder portion by providing the shoulder portion to be recessed inside the upper end of the shaft tube. In addition, a positioning pad is fixed to the shoulder portion of the shaft tube, and at least one bearing pivoted inside the shaft tube can be positioned by the positioning pad. Further, a shaft seat is provided at the center position of the inner peripheral wall surface of the rotor so that it can be coupled to the shaft rod by the shaft seat, and the second balanced magnet is fixed to the position of the periphery of the shaft seat. You can also. The first balance magnet can be fixed to the base of the fixed portion. In addition, the second balanced magnet can be attached to the bottom end of the annular magnet inside the rotor. Further, the first balanced magnet can be formed in either a ring shape or an arc shape. Further, the first balanced magnet can be formed in either a ring shape or an arc shape.

  According to the balance structure of the rotor of the motor of the present invention, the first balance magnet and the second balance magnet are provided corresponding to the fixed portion and the rotor, and the first balance magnet and the second balance magnet are appropriately different. The magnetic attraction corresponding to the axial direction and the magnetic attraction corresponding to the radial direction are formed with the magnetic force of the magnetic pole property, so that there is an advantage that the balance of rotation of the rotor and the stability of starting can be maintained. .

  According to the balance structure of the rotor of the motor of the present invention, the first balance magnet is provided at the upper end of the shaft tube of the fixed portion, and the second balance magnet is provided corresponding to the shaft seat of the rotor. Since the one balanced magnet and the second balanced magnet are formed so as to be correspondingly magnetically attracted with appropriate different magnetic polarities, the balance of rotation of the rotor and the stability of starting can be maintained. There is an advantage.

  According to the balance structure of the rotor of the motor of the present invention, the first balance magnet is provided at the base of the fixed portion, and the second balance magnet is provided at the bottom of the annular magnet inside the rotor. The first balanced magnet and the second balanced magnet are formed so as to be correspondingly magnetically attracted with appropriate different magnetic polarities, so that the rotational balance of the rotor and the start-up stability are maintained. There is an advantage that can be.

  Embodiments of the present invention will be described below with reference to the drawings.

  Referring to FIG. 1, the balanced structure of the rotor of the motor according to the first embodiment of the present invention includes a fixed portion 10, a rotor 20, a first balanced magnet 30, and a second balanced magnet 40. Further, the balanced structure of the rotor of the motor of the present invention can be applied to a motor region such as a main shaft motor of a CD drive or a small heat radiating fan.

  Referring to FIGS. 1 and 2, a base portion 11, a shaft tube 12, a bearing 13, a stator 14 and a circuit board 15 are provided in the fixed portion 10 according to the first embodiment of the present invention. The base 11 can be coupled to the motor shell. The shaft tube 12 can be formed on the base 11 so as to be produced alone or directly as a single piece. At least one bearing 13 can be accommodated in the shaft tube 12, and the outer diameter of the shaft tube 12 can be used to penetrate the stator 14 and the circuit board 15. In addition, another shoulder 120 is formed inside the upper end of the shaft tube 12, and the positioning pad 121 can be fitted into the shoulder 120, so that the bearing 13 can be positioned. The bearing 13 can be selected from conventional bearing structures such as oil-impregnated bearings, ball bearings, liquid bearings, or linear bearings. The stator 14 can be selected from a conventional stator structure such as a radial winding type or an axial winding type, and the stator 14 is provided with at least one pole piece 141 and at least one coil 142. When the control circuit of the circuit board 15 conducts current, the control circuit of the circuit board 15 can alternately control the direction of the current of the coil 142, so that the magnetic pole piece 141 is induced to generate alternating excitation. Can do.

  1 and 2, the rotor 20 according to the first embodiment of the present invention is provided with a shaft rod 21, an annular magnet 22 and a shaft seat 23. The shaft seat 23 is provided so as to protrude to the center position of the inner peripheral wall surface of the rotor 20, and the shaft seat 23 is used for connecting one end of the shaft rod 21. The other end of the shaft rod 21 is formed so as to extend downward, so that the shaft rod 21 is rotatably fitted inside the bearing 13. Since the annular magnet 22 is provided on the inner peripheral surface of the rotor 20 and is formed so as to correspond to the magnetic pole surface (not shown) of the magnetic pole piece 141, the rotor 20 is rotated by the alternating excitation of the magnetic pole piece 141. Can be driven.

  Referring to FIGS. 1 and 2 again, the first balanced magnet 30 according to the first embodiment of the present invention is formed in a ring shape and has a permanent magnetism, and further above and below the first balanced magnet 30. The surface is formed to have different N and S magnetic poles. The first balanced magnet 30 is fitted inside the upper end of the shaft tube 12 by a sticking method or an interference fit method. More specifically, the first balanced magnet 30 is fitted on the positioning pad 121 of the shoulder 120 of the shaft tube 12. The second balanced magnet 40 is also formed in a ring shape and has permanent magnetism, and the upper and lower surfaces of the second balanced magnet 40 have different N and S magnetic pole properties. Formed as follows. The second balanced magnet 40 is fixed to the inner surface of the rotor 20 by a sticking method or an interference fit method. More specifically, the second balanced magnet 40 is fixed at the peripheral position of the shaft seat 23 of the rotor 20.

  Referring to FIG. 2, after the motor is assembled, the first balanced magnet 30 of the present invention is formed to be positioned at the upper end of the shaft tube 12, and the second balanced magnet 40 is formed on the periphery of the shaft seat 23 of the rotor 20. It is formed to be located. Further, the upper surface of the first balanced magnet 30 is formed to correspond to the lower surface of the second balanced magnet 40, and both are formed to have different magnetic polarities. As a result, when the motor is in operation, at rest, or at startup, the upper and lower surfaces of the first balanced magnet 30 and the second balanced magnet 40 are all magnetized using the magnetic polarities N and S that are different in the axial direction. Since suction is performed, the balance of rotation of the rotor 20 and the stability of rotation can be appropriately maintained. In particular, the mutual magnetic attraction between the first balanced magnet 30 and the second balanced magnet 40 is further formed to have an alignment effect of magnetically attracting in the radial direction. That is, when the rotor 20 shifts due to the rotation in the radial direction, it is guided that the rotor 20 is recovered to the accurate radial direction by the above-described effect of the main magnetic attraction. Can help. In other words, the first balance magnet 30 can further improve the balance of rotation of the rotor 20 and the stability of rotation by using the magnetic attraction method in the secondary direction in the axial direction and the radial direction at the same time. In addition, when the motor is stationary, the permanent magnetism of the first balanced magnet 30 and the second balanced magnet 40 can continue to provide a magnetic attraction effect, so that the motor is temporarily unbalanced at the moment of startup. Thus, the starting balance of the rotor 20 and the starting stability can be increased.

  Referring to FIG. 3, the balance structure of the rotor of the motor according to the second embodiment of the present invention is posted. Compared with the first embodiment, in the second embodiment, the first balanced magnet 30 ′ is fixed to the base 11 of the fixed portion 10, and the second balanced magnet 40 ′ is the bottom of the annular magnet 22 inside the rotor 20. It is attached to the end. As a result, the upper surface of the first balanced magnet 30 ′ is similarly magnetically attracted to the lower surface of the second balanced magnet 40 ′ by using different magnetic poles so as to correspond in the axial direction. In addition to magnetic attraction, it can be aligned so that it is magnetically attracted in the radial direction, and the balance between the rotation and start-up of the rotor 20 is appropriately maintained by using a magnetic attraction method in the secondary direction. Can do. Alternatively, the bottom end surface of the direct annular magnet 22 is directly formed on the lower surface of the second balanced magnet 40 ', and the lower surface of the second balanced magnet 40' is formed on the upper surface and the magnetic pole of the first balanced magnet 30 'by excitation. The first balanced magnet 30 'and the second balanced magnet 40' are similarly magnetically attracted so as to correspond in the axial direction and aligned so as to be magnetically attracted in the radial direction. Therefore, the balance at the time of rotation of the rotor 20 can be maintained.

  Referring to FIG. 4, the balance structure of the rotor of the motor according to the third embodiment of the present invention is posted. Compared with Example 1, in Example 3, a plurality of arc-shaped second balanced magnets 40 ″ can be replaced with ring-shaped second balanced magnets 40, or a plurality of arc-shaped first balanced magnets. 30 ″ can be replaced with a ring-shaped first balanced magnet 30. Further, by changing the corresponding size and standard of the first balanced magnet 30 "or the second balanced magnet 40", the corresponding areas of the first balanced magnet 30 "and the second balanced magnet 40" can be appropriately set relatively. The first balanced magnet 30 ″ and the second balanced magnet 40 ″ can adjust the strength of magnetic attraction in the secondary direction or relatively reduce the total load of the rotor 20 because it can be reduced or expanded. The rotor 20 can achieve the best balance and stability during rotation and startup.

  Referring to FIG. 5, the balance structure of the rotor of the motor according to the fourth embodiment of the present invention is posted. Compared with the first embodiment, in the fourth embodiment, as in the third embodiment, the plurality of arc-shaped second balanced magnets 40 ″ can be replaced with the ring-shaped second balanced magnet 40, or the arc-shaped second balanced magnets 40 ″ can be replaced. A plurality of first balanced magnets 30 ″ can be replaced with ring-shaped first balanced magnets 30. Further, by changing the corresponding size and standard of the first balanced magnet 30 "or the second balanced magnet 40", the corresponding areas of the first balanced magnet 30 "and the second balanced magnet 40" can be appropriately set relatively. The first balanced magnet 30 ″ and the second balanced magnet 40 ″ can adjust the strength of magnetic attraction in the secondary direction or relatively reduce the total load of the rotor 20 because it can be reduced or expanded. The rotor 20 can achieve the best balance and stability during rotation and startup.

  As described above, according to the balanced structure of the conventional rotor of the motor, there is a problem that magnetic leakage is likely to occur, and furthermore, the corresponding magnetic attraction can be formed only in the primary direction. According to the balance structure of the rotor of the motor of the invention, by providing the first balance magnet 30 and the second balance magnet 40 so as to correspond in the fixed portion 10 and the rotor 20, in the corresponding magnetic attraction and radial direction in the axial direction. Since it is possible to provide a double-balanced effect in the secondary direction due to the alignment that is mainly magnetically attracted, the rotation balance of the rotor 20 and the start-up stability are reliably maintained, and the service life of the motor is further increased. Can be extended effectively.

  The present invention may be implemented in other ways without departing from the spirit and essential characteristics thereof. Accordingly, the preferred embodiments described herein are illustrative and not limiting.

It is a disassembled perspective view which shows the balance structure of the rotor of the motor of Example 1 of this invention. It is sectional drawing which shows the assembled state by the balance structure of the rotor of the motor of Example 1 of this invention. It is sectional drawing which shows the assembled state by the balance structure of the rotor of the motor of Example 2 of this invention. It is sectional drawing which shows the assembled state by the balance structure of the rotor of the motor of Example 3 of this invention. It is sectional drawing which shows the assembled state by the balance structure of the rotor of the motor of Example 4 of this invention. It is sectional drawing which shows the assembled state by the balanced structure of the rotor of the conventional motor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Fixed part 11 Base 12 Axis tube 120 Shoulder part 121 Positioning pad 13 Bearing 14 Stator 141 Magnetic pole piece 142 Coil 15 Circuit board 20 Rotor 201 Sensitive metal piece 21 Shaft 22 Ring magnet 23 Shaft seat 30, 30 ', 30 " One balanced magnet 40, 40 ', 40 "Second balanced magnet

Claims (9)

  A balance structure of a rotor of a motor constituted by a fixed portion (10), at least one first balanced magnet (30), a rotor (20) and at least one second balanced magnet (40), the fixed portion (10 ) Is provided with a base (11), the stator (14) can be supported by the base (11), the first balanced magnet (30) is fixed to the fixed part (10), and the first balanced At least one surface is formed on the magnet (30), and the shaft (21) and the annular magnet (22) are provided on the rotor (20), and the stator (14) can be rotated by the shaft (21). The annular magnet (22) can be connected to the inner peripheral surface of the rotor (20), the second balanced magnet (40) can be fixed to the rotor (20), and the second balanced magnet (40) can be coupled. Has at least one surface formed The surface of the second balanced magnet (40) is formed to correspond to the surface of the first balanced magnet (30), and the surface of the first balanced magnet (30) and the surface of the second balanced magnet (40) are in phase with each other. By forming the magnetic poles so as to have different magnetic polarities, the surfaces of the first balanced magnet (30) and the second balanced magnet (40) are magnetically attracted so as to correspond in the axial direction, and mainly in the radial direction. The balance structure of the rotor of the motor is characterized in that the balance of the rotation of the rotor (20) can be effectively maintained because of magnetic attraction and alignment.   The fixed portion (10) is provided with a shaft tube (12), and the first balanced magnet (20) is fixed to the upper end of the shaft tube (12) of the fixed portion (10). The balanced structure of the rotor of the described motor.   The first balanced magnet (30) can be fixed to the shoulder (120) by providing the shoulder (120) to be recessed inside the upper end of the shaft tube (12). Item 3. The motor rotor equilibrium structure according to Item 2.   In addition, a positioning pad (121) is fixed to the shoulder (120) of the shaft tube (12), and at least one bearing (13) pivoted inside the shaft tube (12) by the positioning pad (121). The motor rotor balance structure according to claim 3, wherein the rotor can be positioned.   A shaft seat (23) is provided at the center position of the inner peripheral wall surface of the rotor (20) so as to protrude, and can be coupled to the shaft rod (21) by the shaft seat (23). 40. The motor rotor balance structure according to claim 1, wherein 40) is fixed at a peripheral position of the shaft seat (23).   The balance structure of the rotor of the motor according to claim 1, wherein the first balance magnet (30 ') is fixed to a base (11) of the fixed portion (10).   The balance structure of the rotor of the motor according to claim 1, wherein the second balance magnet (40 ') is attached to the bottom end of the annular magnet (22) inside the rotor (20).   The balanced structure of the rotor of the motor according to claim 1, wherein the first balanced magnet (30 ") has either a ring shape or an arc shape.   The balanced structure of the rotor of the motor according to claim 1, wherein the first balanced magnet (40 ") has either a ring shape or an arc shape.

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