JP4781566B2 - DC motor and electric device equipped with the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a DC motor, which is a kind of a small electric motor used mainly as a blower fan drive source such as a room air conditioner, a hot water heater, a ventilator, and an air purifier, and an electric device using the DC motor.
[0002]
[Prior art]
In recent years, DC motors driven by this type of inverter circuit have been adopted as blower motors because of their higher efficiency and better controllability than induction motors. The fans used in ventilation devices and air purifiers have a structure mainly corresponding to induction motors, and the anti-vibration measures are countermeasures by avoiding resonance in the structural aspects corresponding to specific frequencies, and are driven by inverter circuits. In this case, torque ripple is generated by the PWM modulation current, and the reduction of vibration and noise caused by this torque ripple and dead time becomes an issue, and the frequency of the vibration and noise source changes depending on the rotation speed of the fan. , A means for performing vibration insulation between the blade and the motor shaft by interposing an elastic member such as rubber in the blade boss portion of the blower, or an elastic member such as rubber interposed between the permanent magnet constituting the rotor and the shaft Means were taken.
[0003]
Conventionally, JP-A-8-65932 has been disclosed as an example of this type of DC motor. Hereinafter, the configuration will be described with reference to FIGS.
[0004]
As shown in the figure, a cylindrical polar anisotropic magnet 51 having a noncircular inner peripheral surface shape and a metal member, at least a part of the outer peripheral surface being noncircular, A holding member 53 having a center hole 54 to be fitted, the polar anisotropic magnet 51 and the holding member 53 are arranged concentrically, and the polar anisotropic magnet 51 and the holding member 53 are casted into a casting mold. The magnet rotor 55 was configured by setting it in a mold and directly vulcanizing and integrally bonding and fixing an elastic member 56 such as rubber.
[0005]
[Problems to be solved by the invention]
According to such a conventional DC motor, since the elastic member 56 is directly vulcanized, depending on the place where the mounted electrical equipment is installed, it is subjected to a thermal shock, oil smoke, etc. -Based detergent, chlorine-based detergent or the like adheres, or deterioration of the fixing strength is accelerated by the influence of ultraviolet rays or the like, and finally the elastic member 56 is peeled off from the polar anisotropic magnet 51 or peeled off from the holding member 53. There has been a problem of having the possibility of end.
[0006]
In addition, polar anisotropic magnets generally have a property of being easily broken due to the low particle density in the inter-polar part, and the inner peripheral surface shape of the polar anisotropic magnet 51 is intentionally made non-circular (polygonal). Further, by making the outer peripheral surface of the holding member 53 also non-circular, the thickness of the elastic member 56 such as rubber to be filled becomes not uniform, and depending on the position and quantity of the inlet filling the elastic member 56, each note When the flow balance of the elastic member 56 injected from the inlet is lost and the filling pressure is insufficient, the elastic member 56 is partially thinned, and a difference in shrinkage after filling occurs, resulting in a polar anisotropy with the shaft 52. There was a problem that the concentricity of the magnet 51 deteriorated and rotation unevenness, vibration in the rotation direction, and vibration due to unbalance increased. In addition, when the filling pressure becomes abnormally high partially, an internal crack is generated in the interpolar part of the polar anisotropic magnet 51, and cracking during manufacturing impedes ensuring high quality and improving productivity. There was a problem. From the viewpoint of the manufacturing method and characteristics of the polar anisotropic magnet, the magnetic pole peak portion is oriented in the radial direction with the easy axis of magnetic powder fine particles, and the interpolar portion is oriented in the circumferential direction. The magnetic pole peak portion shrinks in the radial direction and the inter-pole portion basically shrinks in the circumferential direction. Therefore, when viewed microscopically, the inner peripheral surface and the outer peripheral surface generally have substantially the same number of poles. Since it is square and the thickness of the magnet is slightly different and not uniform, the same problem can be solved even if it is not extremely non-circular as disclosed in JP-A-8-65932. Had.
[0007]
In addition, since the elastic member 56 has a property that its hardness increases by about 10 degrees due to secular change, when it is mounted on an electrical device such as a ventilator once used for more than 10 years, the time The vibration-proof characteristics deteriorated with the passage of time, and there was a problem that noise and vibration increased during use.
[0008]
Also, in electrical equipment such as ventilators, air purifiers, and air conditioner outdoor units, the majority of equipment is equipped with an AC motor. Therefore, an elastic member such as rubber is interposed between the blade bosses of the blower. In the method of performing vibration isolation with the motor shaft, it is necessary to design, manufacture, and manage the blades of the equipment mounting the DC motor and the blades of the equipment mounting the AC motor, and the cost of the blade mounting the DC motor is There was a problem that it would become abnormally high.
[0009]
Ventilators are used in various environments and may be installed in the vicinity of combustion equipment, or may be greatly affected by the attachment of oil smoke or thermal stress. An elastic member such as rubber is interposed in the blade boss of the blower. This method has a problem that it cannot be quieted while ensuring safety.
[0010]
In addition, there is no anti-vibration rubber that is resistant to both mineral oil and vegetable oil, and anti-vibration rubber that is resistant to mineral oil causes changes in physical properties due to vegetable oil. Changes in physical properties caused by oil. And especially in the ventilation apparatus for cooking among ventilation apparatuses, a blade | wing is metal, and mineral oil adheres by all means in the manufacturing process. In addition, since vegetable oil always adheres in the actual use state, it is difficult to provide a vibration proof rubber on the blade boss, and there is a problem that it is impossible to reduce the noise while ensuring high quality.
[0011]
The present invention solves such a conventional problem, and can suppress vibration and noise even when drive control is performed by 120-degree rectangular wave energization or PWM modulation, and costs can be reduced by suppressing processing defects. An object of the present invention is to provide a DC motor that can maintain high quality and safety, and an electric device using the DC motor.
[0012]
[Means for Solving the Problems]
  In order to achieve the above object, the DC motor of the present invention has a magnet rotor in which a shaft and a cylindrical polar anisotropic magnet are arranged concentrically, and are indirectly vulcanized and bonded integrally with rubber. The injection port during molding is the number of poles of the polar anisotropic magnetEqual toIn addition, the DC motor is configured to be provided on a line connecting the magnetic pole peak portion of the polar anisotropic magnet and the shaft center of the shaft.
[0013]
  According to the present invention, it is possible to reliably prevent deterioration of the rubber fixing strength, and to maintain a uniform flow balance from each inlet at the time of rubber filling, so that the filling pressure can be maintained within an appropriate range and extremely anisotropic. Since the coaxiality of the conductive magnet and the shaft can be made with high accuracy and the occurrence of internal cracks or the like can be prevented in the polar anisotropic magnet, a DC motor with low vibration, high quality and low cost can be obtained.In addition, the blades of the equipment equipped with the AC motor and the blades of the equipment equipped with the DC motor can be shared, and since the rubber part is inside the motor, there is no influence of oil smoke or heat from the combustion equipment. Since it is possible to suppress changes in physical properties, it is possible to provide an electric device that can be used in any environment and achieves noise reduction while ensuring high quality and high durability. In addition, since the force applied to the interpolar portion of the polar anisotropic magnet can be kept low and the occurrence of internal cracks and cracks can be prevented, a DC motor with further higher quality and lower cost can be obtained.
[0014]
  Another means is that the magnet rotor is concentrically arranged with a shaft, a holding member formed of an annular metal having a central hole for fitting the shaft, and a cylindrical polar anisotropic magnet, The rubber is integrally indirect vulcanized and bonded, and the injection port when molding the rubber is the number of poles of the polar anisotropic magnetEqual toIn addition, the DC motor is configured to be provided on a line connecting the magnetic pole peak portion of the polar anisotropic magnet and the shaft center of the shaft.
[0015]
  According to the present invention, it is possible to reliably prevent deterioration of the rubber fixing strength, and to maintain a uniform flow balance from each inlet at the time of rubber filling, so that the filling pressure can be maintained within an appropriate range and extremely anisotropic. Since the coaxiality of the magnet and the shaft can be made with high accuracy, the occurrence of internal cracks etc. in the polar anisotropic magnet can be prevented, and the flexibility of the shaft length is expanded, so low vibration, high quality, low cost, A general-purpose DC motor can be obtained.In addition, the blades of the equipment equipped with the AC motor and the blades of the equipment equipped with the DC motor can be shared, and since the rubber part is inside the motor, there is no influence of oil smoke or heat from the combustion equipment. Since it is possible to suppress changes in physical properties, it is possible to provide an electric device that can be used in any environment and achieves noise reduction while ensuring high quality and high durability. In addition, since the force applied to the interpolar portion of the polar anisotropic magnet can be kept low and the occurrence of internal cracks and cracks can be prevented, a DC motor with further higher quality and lower cost can be obtained.
[0018]
Another means is a configuration of a DC motor characterized in that a recess having a curved cross section is provided on the entire circumference of the end face in the axial direction of rubber.
[0019]
According to the present invention, since the amount of shrinkage in the axial direction is greatly reduced at the time of shrinkage after vulcanization of rubber, deformation stress is not applied to the boundary end portion between the polar anisotropic magnet and rubber and the shaft and rubber. A gap is not generated at the boundary end, and even if oil, an alkaline detergent, a chlorine detergent, or the like adheres, deterioration of the fixing strength is not promoted, so that an extremely high quality DC motor can be obtained.
[0020]
According to another means, the holding member is made of an aluminum-zinc alloy or a magnesium-zirconium alloy.
[0021]
According to the present invention, since the holding member is formed of an aluminum-zinc alloy or a magnesium-zirconium alloy, even if the rubber hardness becomes hard due to aging, due to internal friction by each alloy element inside the holding member, Since the holding member can supplement the vibration-proof characteristic, a DC motor with low vibration and high quality for a long period can be obtained.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
  According to the present invention, the magnet rotor has a shaft and a cylindrical polar anisotropic magnet arranged concentrically, and is indirectly vulcanized and bonded integrally with rubber. Number of poles of isotropic magnetEqual toAnd a configuration of a DC motor characterized by being provided on a line connecting the magnetic pole peak portion of the polar anisotropic magnet and the shaft center of the shaft, and maintaining the rubber fixing strength, The flow balance from each inlet at the time of filling is kept uniform, and the filling pressure has an effect of maintaining an appropriate range. In addition, the blades can be standardized, and the rubber part is inside the motor, so that it has the effect of suppressing the adhesion of oil smoke to the rubber part and the heat of the combustion equipment. Moreover, it has the effect | action of restraining the force applied to the space | interval part of a polar anisotropic magnet low.
[0025]
  The magnet rotor has a shaft, a holding member formed of an annular metal having a central hole for fitting the shaft, and a cylindrical polar anisotropic magnet arranged concentrically and integrally formed with rubber. Indirect vulcanization and adhesion, and the injection port when molding the rubber is the number of poles of the polar anisotropic magnetEqual toAnd a configuration of a DC motor characterized by being provided on a line connecting the magnetic pole peak portion of the polar anisotropic magnet and the shaft center of the shaft, and maintaining the rubber fixing strength, The balance of the flow from each inlet during filling is kept uniform, the filling pressure is maintained within an appropriate range, and the degree of freedom of shaft length is increased. In addition, the blades can be standardized, and the rubber part is inside the motor, so that it has the effect of suppressing the adhesion of oil smoke to the rubber part and the heat of the combustion equipment. Moreover, it has the effect | action of restraining the force applied to the space | interval part of a polar anisotropic magnet low.
[0027]
In addition, the rubber has a DC motor structure characterized in that the end surface in the axial direction of the rubber is provided with a concave portion having a curved cross section on the entire circumference, and contracts in the axial direction when the rubber contracts after vulcanization. The amount is greatly reduced.
[0028]
The holding member is made of an aluminum-zinc alloy or a magnesium-zirconium alloy, and has a DC motor configuration, and the anti-vibration metal supplements the anti-vibration characteristics.
[0030]
Embodiments of the present invention will be described below with reference to FIGS.
[0031]
【Example】
Example 1
As shown in FIGS. 1 and 2, reference numeral 1 denotes a stator in which an armature winding 3 is wound around an insulator 2 formed of an insulating material on a stator core 4 having a plurality of slots. Is molded with a thermosetting resin 13 to form a jacket, and 14 is holding a bearing 12 with a bracket. 9 is a printed circuit board on which Hall IC 10, drive IC 11 and other electronic components (not shown) are mounted, 7 is a magnet rotor, 8 pole ferrite sintered polar anisotropic magnet 6, rubber 5, shaft After the bearing 12 is press-fitted into the magnet rotor 7, it is assembled into the stator 1, the printed circuit board 9 is attached to a predetermined position inside the stator 1, the bracket is press-fitted, and the main body of the DC motor 15 is Is formed. The driving IC 11 incorporates a logic and a power element for energizing a 120-degree rectangular wave by the one-side PWM method based on the signal of the Hall IC 10. And the phenol adhesive 16 is apply | coated to the inner peripheral surface of the ferrite sintered polar anisotropic magnet 6 and the part which the magnet 8 adheres to the vulcanization of the shaft 8, and it arrange | positions concentrically within a metal mold | die. Indirect vulcanization adhesion is performed by injecting unvulcanized rubber while heating and pressing. At this time, since the ferrite sintered polar anisotropic magnet 6 has eight poles, there are eight injection ports 5a and a magnetic pole connecting the magnetic pole peak portion of the ferrite sintered polar anisotropic magnet 6 and the shaft center of the shaft. It is on the center line. In addition, a recess 5b having a curved cross section is provided on the entire circumference on the end face (both sides) in the axial direction of the rubber 5, so that deformation stress when the rubber 5 contracts is not applied to the adhesive portion.
[0032]
According to the DC motor 15 of the present invention as described above, by indirect vulcanization adhesion, deterioration due to secular change in the adhesion strength of the rubber 5 can be surely prevented, and the injection port 5a of the rubber 5 is made of a ferrite sintered electrode. By making the number of poles of the isotropic magnet 6 an integer multiple, the flow balance from the respective inlets 5a during rubber filling can be kept uniform, so that filling pressure does not become insufficient. Since the density of the rubber 5 can be made uniform and the amount of shrinkage of the rubber becomes uniform, the coaxiality of the ferrite sintered polar anisotropic magnet 6 and the shaft 8 can be made highly accurate. In addition, since the filling pressure can be prevented from becoming abnormally high partially, the generation of internal cracks and the like can be suppressed in the sintered ferrite polar anisotropic magnet 6, resulting in lower vibration, higher quality, and lower cost. The obtained DC motor 15 is obtained.
[0033]
Further, by providing the injection port 5a on the magnetic pole center line connecting the magnetic pole peak portion of the sintered ferrite polar anisotropic magnet 6 and the axial center of the shaft, the portion between the magnetic pole pole of the sintered ferrite polar anisotropic magnet 6 and the shaft. Since the injection port 5 is not positioned in the vicinity of the line connecting the axial centers of the eight axes, the weld is positioned at the inter-electrode portion, and is applied to the interior of the magnet due to filling at the inter-electrode portion where the density of the magnetic fine particles is low. Since the internal stress can be reduced and the magnetic powder fine particles do not flow in the direction of tearing, the occurrence of internal cracks and cracks can be reliably prevented, so that the DC motor 15 with higher quality and lower cost can be obtained.
[0034]
In addition, by providing concave portions 5b having a curved cross-sectional shape on the entire circumference on both sides of the end surface in the axial direction of the rubber 5, the amount of contraction in the axial direction is greatly reduced when the rubber 5 is contracted after vulcanization. Since no deformation stress is applied to the boundary end portions of the polar anisotropic magnet 6 and the rubber 5 and the shaft 8 and the rubber 5, no gap is formed at the boundary end portion, so that oil, alkaline detergent, chlorine detergent, etc. Even if it adheres, deterioration of the fixing strength is not promoted, so that a very high quality DC motor 15 can be obtained.
[0035]
In Example 1, a ferrite sintered polar anisotropic magnet is used. However, a magnet in which a ferrite plastic magnet is poled or a rare earth magnet may be used. Does not occur.
[0037]
In the first embodiment, the DC motor 15 is energized with a 120-degree rectangular wave by the one-side PWM method. However, the overlap energization method exceeding 120 degrees and the sine wave drive method having a dead time are used in both the vertical modulation PWM method and the PAM method. However, the effect on the one-side PWM method is the largest, but the other methods have the same effect.
[0038]
(Example 2)
As shown in FIGS. 3 and 4, reference numeral 21 denotes a DC motor, which has a double-shaft shaft structure in which the shaft 17 protrudes from both sides in the axial direction. Reference numeral 20 denotes a magnet rotor, an 8-pole sintered sintered polar anisotropic magnet 6, a rubber 19, a holding member 18 formed of an annular aluminum alloy or zinc alloy having a center hole 18a, and a shaft 17. Is press-fitted into the center hole 18a. The outer peripheral surface of the holding member 18 constituting the magnet rotor 20 is chrome-plated and coated with a phenolic adhesive 16, and the inner peripheral surface of the ferrite sintered polar anisotropic magnet 6 is also phenolic. Adhesive 16 is applied, holding member 18 and ferrite sintered polar anisotropic magnet 6 are arranged concentrically in the mold, and unvulcanized rubber is injected while heating and pressurizing to perform indirect vulcanization adhesion. Has been given. At this time, since the ferrite sintered polar anisotropic magnet 6 has eight poles, there are eight injection holes 19a and a magnetic pole connecting the magnetic pole peak portion of the ferrite sintered polar anisotropic magnet 6 and the shaft center. It is on the center line. Further, the end face (both sides) in the axial direction of the rubber 19 is provided with a recess 19b having a curved cross section on the entire circumference, and the other configuration is the same as that of the first embodiment, and detailed description thereof is omitted.
[0039]
According to such a DC motor 21 of the present invention, by indirect vulcanization adhesion, deterioration due to secular change in the adhesion strength of the rubber 19 can be surely prevented, and the injection port 19a of the rubber 19 is made of a ferrite sintered electrode. By making the number of poles of the isotropic magnet 6 an integer multiple, the flow balance from each inlet 19a at the time of rubber filling can be kept uniform, so the filling pressure does not become insufficient. Since the density of the rubber 19 can be made uniform and the amount of shrinkage of the rubber becomes uniform, the coaxiality of the sintered ferrite anisotropic magnet 6 and the holding member 18 can be made highly accurate. In addition, since the filling pressure can be prevented from becoming abnormally high partially, the generation of internal cracks and the like can be suppressed in the sintered ferrite polar anisotropic magnet 6, resulting in lower vibration, higher quality, and lower cost. The obtained DC motor 21 is obtained.
[0040]
Further, by providing concave portions 19b having a curved cross-sectional shape on the entire circumference on both sides of the end surface in the axial direction of the rubber 19, the amount of contraction in the axial direction is greatly reduced when the rubber 19 is contracted after vulcanization. Since no deformation stress is applied to the boundary end portion between the polar anisotropic magnet 6 and the rubber 19 and the holding member 18 and the rubber 19, no gap is formed at the boundary end portion, and oil, alkaline detergent, chlorine detergent, etc. Even if it adheres, deterioration of the fixing strength is not promoted, so that a very high quality DC motor 21 can be obtained.
[0041]
Further, by applying chrome plating to the outer peripheral surface, which is a part of the holding member 18 to be vulcanized and bonded, the vulcanization is in a very stable state and is resistant to rusting. Therefore, the DC motor 21 with higher quality can be obtained.
[0042]
Further, by providing the injection port 19a on the magnetic pole center line connecting the magnetic pole peak portion of the sintered ferrite polar anisotropic magnet 6 and the axial center of the holding member 18, the inter pole portion of the sintered ferrite polar anisotropic magnet 6 is provided. Since the injection port 19a is not positioned in the vicinity of the line connecting the axis of the shaft 8 and the shaft 8, the weld is positioned at the interelectrode portion, and the magnet is filled by filling in the interelectrode portion where the density of the magnetic fine particles is low. Since the internal stress applied to the magnetic powder can be reduced and the magnetic powder particles do not flow in the direction of tearing, the occurrence of internal cracks and cracks can be surely prevented, so that the DC motor 21 with higher quality and lower cost can be obtained. It is done.
[0043]
Further, after the holding member 18 and the ferrite sintered polar anisotropic magnet 6 are indirectly vulcanized and bonded with the rubber 19, the shaft 17 is pressed into the center hole 18 a of the holding member 18, thereby forming the shaft 17. The magnet rotor before press-fitting can be standardized, and the restriction on the shaft length is eliminated, so the cost of the DC motor can be reduced and shaft joints can be made unnecessary, greatly expanding the use of the DC motor. .
[0044]
In Example 2, a ferrite sintered polar anisotropic magnet is used. However, a magnet in which a ferrite plastic magnet is pole-oriented or a rare earth magnet may be used. Does not occur.
[0045]
In Example 2, the holding member 18 is formed of an aluminum alloy or a zinc alloy, but may be formed of a magnesium-zirconium alloy or an aluminum-zinc alloy, or may be formed of a magnesium-zirconium alloy or an aluminum-zinc alloy. Even if the hardness of the rubber 19 becomes hard due to secular change, the holding member can supplement the vibration-proof characteristics due to internal friction caused by sliding at the crystal grain boundary of each alloy element inside the holding member. It is possible to provide a DC motor with low vibration and high quality for the period.
[0046]
(Example 3)
As shown in FIG. 5 to FIG. 7, reference numeral 22 denotes an internal rotation type DC motor, which has a double shaft shaft structure in which the shaft 17 protrudes from both sides in the axial direction. Reference numeral 23 denotes a magnet rotor which includes an 8-pole sintered sintered polar anisotropic magnet 6, a rubber 19, a holding member 24 formed of an annular magnesium-zirconium alloy having a center hole 24 a, and a shaft 17. It is configured to be press-fitted into the center hole 24a. A phenolic adhesive 16 is applied to the outer peripheral surface of the holding member 24 constituting the magnet rotor 23, and a phenolic adhesive 16 is also applied to the inner peripheral surface of the sintered ferrite polar anisotropic magnet 6 for holding. The member 24 and the ferrite sintered polar anisotropic magnet 6 are disposed concentrically in the mold, and indirect vulcanization adhesion is performed by injecting unvulcanized rubber while heating and pressing. At this time, since the ferrite sintered polar anisotropic magnet 6 has eight poles, there are eight injection holes 19a and a magnetic pole connecting the magnetic pole peak portion of the ferrite sintered polar anisotropic magnet 6 and the shaft center. It is on the center line. The rubber 19 has end faces (both sides) in the axial direction of the rubber 19 which are provided with concave portions 19c having a curved cross section on the entire circumference. The other configurations of the DC motor 22 are the same as those in the first embodiment, and detailed description thereof will be omitted. Omitted. Reference numeral 25 denotes a simultaneous supply / exhaust type ventilation device body incorporating a heat exchange element 30 and an air supply filter 31, and a metal air supply blade 26 is provided at one end of the shaft 17, and the other end is provided. The metal exhaust blades 27 are directly fixed without intervening vibration isolation structures.
[0047]
According to the ventilator 25 of the present invention, the supply blade 26, the exhaust blade 27, and the DC motor 22 are vibration-insulated by the rubber 19, so that the torque ripple, torque change rate, dead time, PWM In addition to preventing the vibration generated by the carrier from resonating with the supply blade 26 and the exhaust blade 27, the coaxiality of the supply blade 26, the exhaust blade 27 and the shaft 17 can be made highly accurate. Since the air supply blades 26 and the exhaust blades 27 and the clearances of the orifices 28 and 29 are not dense, it is possible for the ventilation device 25 to prevent the generation of second-type moving blade rotation noise caused by rotation and the generation of rotation vibration. In addition, it is possible to provide the ventilation device 25 that can suppress generation of noise due to resonance with a building material such as a wall with low noise.
[0048]
In addition, a simple and simple 120-degree rectangular wave drive method, an overlap drive method, Even if a sine wave drive method without dead time compensation is adopted, the silencer ventilation device 25 can be provided. In particular, it has a remarkable effect in the 120-degree rectangular wave method by the one-side PWM method.
[0049]
In addition, as shown in FIG. 7, in the ventilator for cooking (range hood) among the ventilators, the rubber 19 is located inside the DC motor 22, so that the oil smoke generated during cooking does not adhere to the rubber 19. Therefore, since the possibility that the rubber 19 will change the physical properties is extremely low, it is possible to provide the ventilator 25 that achieves noise reduction while ensuring high quality and high durability.
[0050]
In addition, since the holding member 24 is made of a magnesium-zirconium alloy, even if the hardness of the rubber 19 is increased due to aging, the inside of the holding member 24 due to slipping at the crystal grain boundary of each alloy element. Since the holding member 24 can supplement the vibration isolation characteristics by friction, it is possible to provide the ventilator 25 with low vibration and high quality for a long period of time.
[0051]
In the third embodiment, the holding member 24 is formed of a magnesium-zirconium alloy. However, an aluminum-zinc alloy may be used, and the holding member 24 supplements the vibration-proof characteristic by internal friction caused by each alloy element inside the holding member 24. Therefore, there is no difference in the effect.
[0052]
In the third embodiment, the ventilation device is described as an electric device. However, an air cleaner, a water heater, and an air conditioner have the same effect as the electric device.
[0053]
【The invention's effect】
  As is clear from the above embodiments, according to the present invention, the magnet rotor has a shaft and a cylindrical polar anisotropic magnet arranged concentrically, and is indirectly vulcanized and bonded integrally with rubber. The injection port at the time of molding the rubber is the number of poles of the polar anisotropic magnetEqual toIn addition, the configuration of the DC motor provided on the line connecting the magnetic pole peak portion of the polar anisotropic magnet and the shaft center of the shaft can surely prevent deterioration of the rubber fixing strength, Since the flow balance from the inlet can be kept uniform, the filling pressure can be maintained within an appropriate range, the coaxiality of the polar anisotropic magnet and the shaft can be made with high precision, and internal cracks etc. are generated in the polar anisotropic magnet. Therefore, a DC motor with low vibration, high quality, and low cost can be obtained. In addition, the blades of the equipment equipped with the AC motor and the blades of the equipment equipped with the DC motor can be shared, and since the rubber part is inside the motor, there is no influence of oil smoke or heat from the combustion equipment. Since the change in physical properties can be suppressed, an electric device that can be used in any environment and can be quieted while ensuring high quality and high durability can be obtained. In addition, since the force applied to the interpolar portion of the polar anisotropic magnet can be kept low and the occurrence of internal cracks and cracks can be prevented, a DC motor with further higher quality and lower cost can be obtained.
[0054]
  The magnet rotor has a shaft, a holding member formed of an annular metal having a central hole for fitting the shaft, and a cylindrical polar anisotropic magnet arranged concentrically and integrally formed with rubber. Indirect vulcanization and adhesion, and the injection port when molding the rubber is the number of poles of the polar anisotropic magnetEqual toIn addition, the configuration of the DC motor provided on the line connecting the magnetic pole peak portion of the polar anisotropic magnet and the shaft center of the shaft can surely prevent deterioration of the rubber fixing strength, Since the flow balance from the inlet can be kept uniform, the filling pressure can be maintained within an appropriate range, the coaxiality of the polar anisotropic magnet and the shaft can be made with high precision, and internal cracks etc. are generated in the polar anisotropic magnet. Since the degree of freedom of the shaft length is increased, a DC motor with reduced vibration, higher quality, lower cost, and general use can be obtained. In addition, the blades of the equipment equipped with the AC motor and the blades of the equipment equipped with the DC motor can be shared, and since the rubber part is inside the motor, there is no influence of oil smoke or heat from the combustion equipment. Since the change in physical properties can be suppressed, an electric device that can be used in any environment and can be quieted while ensuring high quality and high durability can be obtained. In addition, since the force applied to the interpolar portion of the polar anisotropic magnet can be kept low and the occurrence of internal cracks and cracks can be prevented, a DC motor with further higher quality and lower cost can be obtained.
[0056]
In addition, the configuration of the DC motor that has a concave portion with a curved cross section on the entire circumference in the axial end face of the rubber greatly reduces the amount of shrinkage in the axial direction when the rubber shrinks after vulcanization. No deformation stress is applied to the boundary end of the anisotropic magnet and rubber and shaft and rubber, so there is no gap at the boundary end, even if oil, alkaline detergent or chlorine detergent adheres, Since deterioration of the fixing strength is not promoted, an extremely high quality DC motor can be obtained.
[0057]
In addition, with the configuration of the DC motor in which the holding member is formed of an aluminum-zinc alloy or a magnesium-zirconium alloy, even if the rubber hardness becomes hard due to aging, the holding member is caused by internal friction due to each alloy element inside the holding member. Since the anti-vibration characteristics can be supplemented, a DC motor with low vibration and high quality for a long period of time can be obtained.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing the structure of a DC motor in Embodiment 1 of the present invention.
FIG. 2 is a perspective view of a magnet rotor of the DC motor.
FIG. 3 is a longitudinal sectional view showing the structure of a DC motor in Embodiment 2 of the present invention.
FIG. 4 is a perspective view of a magnet rotor of the DC motor.
FIG. 5 is a cross-sectional view showing a ventilation device according to Embodiment 3 of the present invention.
FIG. 6 is a longitudinal sectional view showing the structure of a DC motor mounted on the ventilation device.
FIG. 7 is a longitudinal sectional view showing another ventilator equipped with the DC motor.
FIG. 8 is a longitudinal sectional view showing the structure of a magnet rotor in a conventional DC motor
FIG. 9 is a plan view of a magnet rotor in the DC motor.
[Explanation of symbols]
1 Stator
2 Insulator
3 Armature winding
4 Stator core
5 Rubber
5a Inlet
5b recess
6 Polar anisotropic magnet
7 Magnet rotor
8 Shaft
9 Printed circuit board
10 Hall IC
11 Drive IC
12 Bearing
13 Mold resin
14 Bracket
15 DC motor
16 Phenolic adhesive
17 Shaft
18 Holding member
18a Center hole
19 Rubber
19a inlet
19b recess
20 Magnet rotor
21 DC motor
22 DC motor
23 Magnet rotor
24 Holding member
24a Center hole
25 Ventilator
26 Air supply blades
27 Exhaust vanes
28 Orifice
29 Orifice
30 Heat exchange element
31 Air supply filter

Claims (5)

A DC motor comprising a stator having an armature winding wound around a stator core and a magnet rotor using a cylindrical polar anisotropic magnet;
The magnet rotor arranges the shaft and the polar anisotropic magnet concentrically and is indirectly vulcanized and bonded integrally with rubber,
The number of injection ports at the time of molding the rubber is the same as the number of poles of the polar anisotropic magnet, and is provided on a line connecting the magnetic pole peak portion of the polar anisotropic magnet and the shaft center of the shaft. DC motor. A DC motor comprising a stator having an armature winding wound around a stator core and a magnet rotor using a cylindrical polar anisotropic magnet;
The magnet rotor has a shaft, a holding member made of an annular metal having a central hole for fitting the shaft, and the polar anisotropic magnet concentrically arranged, and indirectly added with rubber. And the number of injection ports at the time of molding the rubber is the same as the number of poles of the polar anisotropic magnet, and on the line connecting the magnetic pole peak portion of the polar anisotropic magnet and the shaft center of the shaft. A DC motor characterized by being provided.   3. The DC motor according to claim 1, wherein a concave portion having a curved cross section is provided on an end surface in the axial direction of the rubber.   3. The DC motor according to claim 2, wherein the holding member is made of an aluminum-zinc alloy or a magnesium-zirconium alloy.   An electrical device that is any one of a ventilation device, an air purifier, a water heater, and an air conditioner on which the DC motor according to any one of claims 1 to 4 is mounted.

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