CN113812063B - Synchronous motor - Google Patents
Synchronous motor Download PDFInfo
- Publication number
- CN113812063B CN113812063B CN202080006471.7A CN202080006471A CN113812063B CN 113812063 B CN113812063 B CN 113812063B CN 202080006471 A CN202080006471 A CN 202080006471A CN 113812063 B CN113812063 B CN 113812063B
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- synchronous motor
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- teeth
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- 230000001360 synchronised effect Effects 0.000 title claims abstract description 55
- 238000000465 moulding Methods 0.000 claims abstract description 80
- 238000004804 winding Methods 0.000 claims abstract description 21
- 239000011347 resin Substances 0.000 claims abstract description 12
- 229920005989 resin Polymers 0.000 claims abstract description 12
- 230000002093 peripheral effect Effects 0.000 claims abstract description 7
- 239000011800 void material Substances 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000013016 damping Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 230000012447 hatching Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/14—Stator cores with salient poles
- H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
- H02K1/148—Sectional cores
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
- H02K21/16—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures having annular armature cores with salient poles
Abstract
The synchronous motor has a stator (12), and the stator (12) has: a cylindrical core holder (1); a plurality of teeth (2) formed by protruding from the core holder (1) in the radial direction and being arranged in the circumferential direction; a slot unit (3) that covers the teeth (2); a winding part (4) formed by winding a wire around the teeth (2) via the slot unit (3); and a molding part (7) which is formed by filling resin between adjacent teeth (2). The teeth (2) have a protruding portion (22) extending in the radial direction from the core holder (1) and an enlarged portion (21) extending in the circumferential direction from the tip of the protruding portion (22), and the slot unit (3) has a 1 st unit portion (31) covering the radially inward surface of the core holder (1) and the outer peripheral surface of the protruding portion (22) and a 2 nd unit portion (32) covering the radially outward surface of the enlarged portion (21). The end in the circumferential direction of the 2 nd unit portion (32) coincides with the end in the circumferential direction of the enlarged portion (21), or covers at least a part of the surfaces of the enlarged portions (21) of adjacent teeth (2) facing each other, and the molding portion (7) forms a gap between the enlarged portions (21) of at least 1 adjacent tooth (2).
Description
Technical Field
The present invention relates to a synchronous motor in which resin is filled between teeth of a stator.
Background
Among motors, there is a synchronous motor having a stator with windings wound around teeth and a rotor having permanent magnets. In a synchronous motor, noise is generated by vibrating a stator by electromagnetic force generated by mutual interference of magnetic flux of the stator and magnetic flux of a rotor.
Patent document 1 discloses a motor in which vibration of a stator is suppressed by providing a non-magnet support portion that connects tips of teeth to each other, thereby suppressing noise.
Patent document 1: japanese patent laid-open No. 2002-112473
Disclosure of Invention
The magnitude of the noise is greatly affected at the resonance of the structure. For noise caused by electromagnetic force, resonance of the stator is often problematic. The resonance of the stator includes a natural mode in which the stator having a circular ring shape is deformed into an elliptical shape or a polygonal shape.
In addition, the electromagnetic force generated in the synchronous motor is a spatial harmonic having a spatial distribution in the circumferential direction of the inner diameter of the stator formed in a circular ring shape. The number of harmonics is determined by the number of poles of the rotor, i.e. the number of slots, etc. which are spaces between the teeth. If the electromagnetic force generated in the synchronous motor is 2 nd harmonic, a force deforming the stator into an elliptical shape is generated. If the electromagnetic force generated in the synchronous motor is 4 th harmonic, a force deforming the stator into a quadrangle is generated. Further, the shape of the stator that the electromagnetic force tries to deform is referred to as a spatial pattern of its electromagnetic force. That is, if the electromagnetic force is 2 nd harmonic, the spatial mode of the electromagnetic force is elliptical. If the electromagnetic force is 4 th harmonic, the spatial mode of the electromagnetic force is quadrilateral.
The natural mode and the spatial mode of electromagnetic force related to the resonance of the stator are different in frequency according to the number of modes. When the natural mode and the spatial mode of the electromagnetic force coincide and the frequencies coincide, they resonate with each other, and significant vibration and noise are generated. Further, noise generated for the reasons described above becomes high-frequency noise caused by a multiple component of the motor drive current and PWM harmonic components. High frequency noise is easily recognized as very harsh sounds.
By merely connecting the tips of the teeth to each other as in the motor disclosed in patent document 1, the occurrence of vibration and noise when the natural mode and the spatial mode of the electromagnetic force are identical and the frequencies are identical cannot be sufficiently suppressed. In addition, the frequency of the electromagnetic vibration force and the resonance frequency in the natural mode of the stator cannot be sufficiently suppressed, and noise is generated.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a synchronous motor capable of suppressing occurrence of noise caused by coincidence of a natural mode and a spatial mode of electromagnetic force and coincidence of a resonance frequency of a stator and a frequency of electromagnetic vibration force.
In order to solve the above problems and achieve the object, the present invention provides a stator including: a cylindrical core print; a plurality of teeth formed by protruding radially from the core holder and circumferentially arranged; a slot unit covering the teeth; a winding part formed by winding a wire around the teeth via a slot unit; and a molding part formed by filling resin between adjacent teeth. The tooth has: a projection extending radially from the core print; and an enlarged portion that expands in a circumferential direction from a front end of the protruding portion, the slot unit having: a 1 st unit part covering the surface of the core holder facing the radial inner side and the outer peripheral surface of the extension part; and a 2 nd unit portion covering a radially outward surface of the enlarged portion. The end in the circumferential direction of the 2 nd unit portion coincides with the end in the circumferential direction of the enlarged portion or covers at least a part of the surface of the adjacent teeth where the enlarged portions face each other, and the molded portion forms a gap between the enlarged portions of at least 1 adjacent teeth.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, there is an effect that a synchronous motor can be obtained that can suppress occurrence of noise caused by coincidence of a natural mode and a spatial mode of electromagnetic force and coincidence of a resonance frequency of a stator and a frequency of electromagnetic vibration force.
Drawings
Fig. 1 is a cross-sectional view showing a synchronous motor according to embodiment 1 of the present invention.
Fig. 2 is an oblique view of the stator in embodiment 1.
Fig. 3 is an oblique view of the stator in embodiment 1, and is a diagram showing a state in which a molded part is omitted.
Fig. 4 is a partial enlarged view of a tooth portion of a part of embodiment 1.
Fig. 5 is an enlarged partial cross-sectional view of a tooth portion of a part of embodiment 1.
Fig. 6 is a sectional view of the stator in embodiment 1, and is a diagram for explaining the position of the 2 nd molding part.
Fig. 7 is a diagram showing an example of a relationship between the frequency of the electromagnetic vibration force and the resonance frequency of the stator in the synchronous motor according to embodiment 1.
Fig. 8 is a diagram showing a frequency Δf of-3 dB at which the response ratio at both sides of the formants becomes the peak when the resonance frequency is f0 and the mode damping ratio ζ.
Fig. 9 is a diagram showing a mold used for manufacturing a stator in embodiment 1.
Fig. 10 is an enlarged partial cross-sectional view of a tooth portion of a part of a stator of the synchronous motor according to embodiment 2.
Fig. 11 is a diagram showing a modification of the slot unit.
Detailed Description
Hereinafter, a synchronous motor according to an embodiment of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the present embodiment.
Embodiment 1
Fig. 1 is a cross-sectional view showing a synchronous motor according to embodiment 1 of the present invention. Fig. 2 is an oblique view of the stator in embodiment 1. Fig. 3 is an oblique view of the stator in embodiment 1, and is a diagram showing a state in which a molded part is omitted. The synchronous motor 20 has a rotor 11 and a stator 12.
The rotor 11 has a rotor core 5 and a permanent magnet 6. The rotor core 5 is formed by stacking a plurality of electromagnetic steel plates punched in a circular shape or a ring shape. The electromagnetic steel plate is a magnet. The rotor core 5 has a cylindrical shape or a cylindrical shape. Permanent magnets 6 are attached to the outer peripheral surface of rotor core 5. In embodiment 1, 10 permanent magnets 6 are adhered to the outer peripheral surface of the rotor core 5. The 10 permanent magnets 6 are arranged at equal intervals in the circumferential direction, and the number of poles of the rotor 11 is 10. The permanent magnet 6 may be embedded in the rotor core 5. The permanent magnet 6 may be attached to the rotary shaft without using the rotor core 5.
The stator 12 has a stator core 13. The stator core 13 is formed by stacking a plurality of electromagnetic steel plates. The stator core 13 has a cylindrical core holder 1 and a plurality of teeth 2 protruding radially from an inner peripheral surface of the core holder 1. In the present specification, the term "radial direction" refers to the radial direction and the circumferential direction of the cylindrical core holder 1. In this specification, the term "axial direction" means a direction along the central axis of the cylindrical core holder 1. The plurality of teeth 2 are arranged at equal intervals in the circumferential direction. In embodiment 1, 12 teeth 2 are provided. The angle θ1 between adjacent teeth 2 centered on the center axis C of the core print 1 is 30 degrees. The stator core 13 surrounds the rotor 11. A gap is provided between the stator core 13 and the rotor 11. The teeth 2 have an extension 22 extending radially inward from the core holder 1, and an enlarged portion 21 extending circumferentially from the tip of the extension 22.
Fig. 4 is a partial enlarged view of a tooth portion of a part of embodiment 1. Fig. 5 is an enlarged partial cross-sectional view of a tooth portion of a part of embodiment 1. The stator 12 has a slot unit 3 covering the circumference of the tooth 2. The slot unit 3 is, for example, a resin molded product. The slot unit 3 has: a 1 st unit portion 31 covering a radially inward surface of the core holder 1 and an outer peripheral surface of the extension portion 22; and a 2 nd unit portion 23 covering a radially outward surface of the enlarged portion 21. The end in the circumferential direction of the 2 nd unit portion 32 coincides with the end in the circumferential direction of the enlarged portion 21. The stator 12 has a winding portion 4. The winding portion 4 is formed by winding a wire around the teeth 2 from above the resin molded product. The windings are intensively wound around the teeth 2. The windings have end portions at both ends in the lamination direction of the electromagnetic steel plates constituting the stator core 13. Insulation between the winding portion 4 and the stator core 13 is achieved by the slot unit 3.
The stator 12 has a molding 7. The molding 7 is formed by resin filled in the spaces between the teeth 2, i.e., the slots 14. The rigidity of the stator 12 is improved and the heat dissipation performance is improved by the molding portion 7. The insulation between the winding portion 4 and the stator core 13 is improved by the molding portion 7. As shown in fig. 2, the molding portion 7 has a portion covering the ends of the winding wires provided at both ends in the lamination direction of the electromagnetic steel sheets constituting the stator core 13, in addition to the portion filled into the slot 14.
As shown in fig. 5, the molding part 7 has a 1 st molding part 7a filled into the slot 14 and a 2 nd molding part 7b filled into the slot 14.
The 1 st molding portion 7a is engaged with the surface of the adjacent tooth 2 where the enlarged portions 21 are opposed to each other. The faces of the enlarged portions 21 of the teeth 2 that are opposite to each other are not covered by the slot unit 3, and therefore the adjacent teeth 2 are engaged with each other by the 1 st molding portion 7a. In the slot 14 filled with the 1 st molding part 7a, the slot units 3 arranged on both sides thereof are engaged with each other, the wire winding parts 4 are engaged with each other, and the teeth 2 are engaged with each other by the 1 st molding part 7a. The slot units 3, the winding portions 4, and the teeth 2 are joined to each other by the 1 st molding portion 7a, thereby achieving an improvement in rigidity of the stator 12.
The 2 nd molding portion 7b is not engaged with the face of the enlarged portion 21 of the adjacent tooth 2 opposed to each other. That is, the 2 nd molding portion 7b exposes the surfaces of the enlarged portions 21 of the adjacent teeth 2 facing each other. In the slot 14 filled with the 2 nd molding portion 7b, the slot units 3 disposed on both sides thereof and the wire winding portion 4 are joined to each other by the 2 nd molding portion 7b. The slot units 3 and the winding portions 4 are joined to each other by the 2 nd molding portion 7b, thereby achieving an improvement in rigidity of the stator 12.
However, the 2 nd molding portion 7b is not engaged with the face of the enlarged portion 21 of the adjacent tooth 2 opposed to each other, and therefore, in the slot 14 filled with the 2 nd molding portion 7b, the teeth 2 are not engaged with each other by the 2 nd molding portion 7b. Therefore, the rigidity of the portion filled with the 2 nd molding 7b is reduced compared with the portion filled with the 1 st molding 7a. In addition, in the slot 14 filled with the 2 nd molding portion 7b, the entirety of the region between the enlarged portions 21 of the adjacent teeth 2 is a void.
The synchronous motor 20 according to embodiment 1 is a 10-pole 12-slot motor having a structure in which the number of poles of the rotor 11 is 10 and the number of slots is 12. Fig. 6 is a sectional view of the stator in embodiment 1, and is a diagram for explaining the position of the 2 nd molding part. Hatching is omitted in fig. 6. The 2 nd molding portion 7b is provided in the plurality of slots 14. As shown in fig. 6, the 2 nd molding portions 7b are provided at 3 positions, and the angle θ2 formed by the 2 nd molding portions 7b with respect to each other about the center axis C of the core print 1 is 120 degrees. The enlarged portions 21 of the teeth 2 provided on both sides of the 2 nd molding portion 7b are triangular in shape with their apexes as shown in fig. 6. Further, by setting the angle θ2 to be constant, the shape having the enlarged portions 21 of the teeth 2 provided on both sides of the 2 nd molding portion 7b as the apexes between them can be made to be a regular polygon.
In a 10-pole 12 slot motor, the spatial modes of electromagnetic force in the stator 12 dominate are a circular elliptical mode and a circular quadrilateral mode.
In the synchronous motor 20, the 2 nd molded part 7b having lower rigidity than the 1 st molded part 7a is provided with the angle θ2 set to 120 degrees. That is, the 2 nd molded part 7b is more easily deformed than the 1 st molded part 7a, and if the 3-part 2 nd molded part 7b is deformed, the annular stator 12 is deformed to approximate a triangle shape. That is, in the stator 12 of embodiment 1, the natural mode is mainly the circular triangular mode.
Therefore, the space mode of the electromagnetic force, in which the circular elliptical mode and the circular square mode are dominant, and the natural mode, in which the circular triangular mode is dominant, are not easily matched. This suppresses the occurrence of significant vibration and noise caused by the coincidence of the spatial mode and the natural mode of the electromagnetic force.
In addition, in the case where the number of slots 14 is a multiple of 3 that is greater than or equal to 6 and the number of poles of the rotor 11 is not a multiple of 3, by providing the 2 nd molding portion 7b so that θ2 is 120 degrees, the effect of suppressing occurrence of noise by preventing coincidence of the space mode and the natural mode of electromagnetic force can be obtained. Even when the above conditions are not satisfied, the arrangement of the 2 nd molding portion 7b is determined so as to be in a natural mode different from the shape of the spatial mode of the electromagnetic force, whereby the effect of suppressing the occurrence of noise by preventing the coincidence of the spatial mode and the natural mode of the electromagnetic force can be obtained. That is, by changing the arrangement of the 1 st molding portion 7a and the 2 nd molding portion 7b in accordance with the spatial mode of the electromagnetic force, it is possible to prevent coincidence of the spatial mode and the natural mode of the electromagnetic force and suppress occurrence of noise.
In addition, noise can be suppressed by providing the 2 nd molding part not only for a synchronous motor using a stator having a split core in which a core holder is split in the circumferential direction but also for a synchronous motor using a stator having an integrated core in which a core holder is not split in the circumferential direction.
Inside the slot 14, the tip end portion of the tooth 2 is the only portion capable of directly bonding the tooth 2 and the molded portion 7 without passing through the slot unit 3, and is a portion capable of firmly bonding the teeth 2 to each other. Since the tip portion of the tooth 2 is located at the innermost circumference of the annular stator 12, the radial thickness of the annular shape varies depending on the presence or absence of the molded portion 7. That is, in the portion where the 1 st molding portion 7a is provided, the thickness in the radial direction of the annular shape becomes larger on the radial direction inside. On the other hand, in the portion where the 2 nd molding portion 7b is provided, the thickness in the radial direction of the annular shape becomes smaller on the radial inner side. Specifically, the thickness of the core holder 1 and the teeth 2 added to each other is a circular ring shape in the portion where the 1 st molding portion 7a is provided, and the thickness of only the core holder 1 is a circular ring shape in the portion where the 2 nd molding portion 7b is provided. Therefore, the presence or absence of the molded part 7 at the tip end portion of the tooth 2 is an element that greatly affects the rigidity of the portion. Therefore, by properly disposing the molding portion 7 toward the tip end portion of the tooth 2, the dominant natural mode can be controlled. Therefore, the natural mode is different from the spatial mode of the electromagnetic force, and noise suppression is easily achieved.
Fig. 7 is a diagram showing an example of a relationship between the frequency of the electromagnetic vibration force and the resonance frequency of the stator in the synchronous motor according to embodiment 1.
For example, the synchronous motor 20 is a 10-pole 12-slot motor, and thus becomes a pole pair number p=5. Further, it is assumed that the rotation number r=0 to 6000[ r/min ], and the PWM frequency fc=5500 [ hz ] of the synchronous motor 20. In this case, the space mode is a circular elliptical mode, and the frequency range of the dominant electromagnetic vibration force is fc±p×r/60[ hz ], specifically 5500±500[ hz ]. The range of frequencies is indicated by hatching in fig. 7.
In the above conditions, in fig. 7, the relationship between the frequency and the response ratio of the stator in which the 1 st molding portion 7a is provided in all the slots 14 and the resonance frequency of the stator in which the natural mode is the circular elliptical mode is 5000[ hz ] is shown by a solid line. In this case, the frequency range of the electromagnetic vibration force in the circular elliptical mode corresponds to 5000 hz, which is the resonance frequency of the stator, and thus noise increases.
On the other hand, in fig. 7, the relation between the frequency and the response ratio in the case where the 2 nd molded part 7b is provided at 120 degree intervals is shown by a broken line as in the stator 12 in embodiment 1, by changing the condition of the molded part from the stator.
In this case, the response magnification at the frequency where the natural mode is the circular elliptical mode becomes small, and the resonance frequency of the stator is away from the range of the frequency where the space mode is the electromagnetic vibration force in the circular elliptical mode. Thus, occurrence of noise is suppressed. For example, the resonance frequency of the natural mode circular elliptical mode is set to be away from the frequency range of the electromagnetic vibration force of the space mode circular elliptical mode, and the response ratio is set to-3 [ dB ] (. About.1/. Cndot.2) as the target. Fig. 8 is a diagram showing a frequency Δf of-3 dB at which the response ratio at both sides of the formants becomes the peak when the resonance frequency is f0 and the mode damping ratio ζ. The frequency width Δf for setting the response magnification at the resonance frequency to-3 [ db ] becomes Δf=2×f0×ζ. For example, when the resonance frequency f0=5000 [ hz ] and the mode attenuation ratio ζ=0.02, the frequency width Δf for setting the response magnification at the resonance frequency to-3 [ db ] becomes Δf=2×f0×ζ=200 [ hz ]. That is, by keeping the resonance frequency away from the range of the frequency of the electromagnetic vibration force by Δf/2 or more, that is, 100[ Hz ], the response magnification can be set to-3 [ dB ].
Further, by providing the 2 nd molding portion 7b at 120 degree intervals, the ring triangle mode of the natural mode is dominant, and thus the response magnification at the frequency of the ring triangle mode becomes large. However, since electromagnetic vibration force in which the space mode becomes the circular triangle mode in the motor with 10 poles 12 slots is not dominant, vibration and noise are not increased.
In addition, there is a method of increasing the resonance frequency by making the frame, which is the frame of the synchronous motor, thicker as a method of changing the resonance frequency. In this case, the synchronous motor is enlarged. In addition, there is a method of reducing the resonance frequency by thinning the core print of the stator as a method of changing the resonance frequency. In this case, the magnetic performance is lowered and the output is lowered.
In the synchronous motor 20 according to embodiment 1, the number and positions of the 2 nd molding portions 7b are adjusted, so that the resonance frequency can be changed. Therefore, the generation of vibration and noise can be suppressed while suppressing the increase in size and the decrease in output of the synchronous motor 20. In addition, at least 1 of the molded parts 7 may be the 2 nd molded part 7b, or all of the molded parts 7 may be the 2 nd molded part 7b. In the above case, the resonance frequency of the stator is reduced, and the occurrence of vibration and noise can be suppressed.
Fig. 9 is a diagram showing a mold used for manufacturing a stator in embodiment 1. The mold 8 is used when forming the molded part 7. The mold 8 has a cylindrical portion 8a having a cylindrical shape inserted into the stator core 13 formed with the winding portion 4. The cylindrical portion 8a has a slightly larger outer diameter than the region where the rotor 11 is disposed. The resin flows in with the cylindrical portion 8a inserted inside the stator core 13, thereby forming the molded portion 7. In the cylindrical portion 8a, there are formed projections 9 which enter between the enlarged portions 21 of the teeth 2 in a state of being inserted into the inside of the stator core 13.
At the location where the projections 9 enter, the enlarged portions 21 of the teeth 2 are not filled with resin between each other. The resin filled in the slot 14 into which the projection 9 enters becomes the 2 nd molding 7b. At the location where the projections 9 do not enter, the enlarged portions 21 of the teeth 2 are filled with resin between each other. The resin filled in the slot 14 into which the projection 9 does not enter becomes the 1 st molding part 7a. By using the mold 8 provided with the projections 9 which enter between the enlarged portions 21 of the teeth 2, the manufacturing of the molding portion 7 having the 1 st molding portion 7a and the 2 nd molding portion 7b can be facilitated.
In addition, by using the mold 8 having the different positions of the protrusions 9, the arrangement of the 1 st molding portion 7a and the 2 nd molding portion 7b can be easily changed. By changing the arrangement of the 1 st molding part 7a and the 2 nd molding part 7b, the dominant natural mode in the stator can be easily selected. Therefore, the stator whose natural mode does not coincide with the spatial mode of the electromagnetic force of the synchronous motor can be easily manufactured.
Embodiment 2
Fig. 10 is an enlarged partial cross-sectional view of a tooth portion of a part of a stator of the synchronous motor according to embodiment 2. Note that the same structure as that of embodiment 1 is omitted.
In embodiment 2, the surface of the 2 nd molded portion 7b and the surface of the enlarged portion 21 of the adjacent tooth 2 facing each other are joined. Further, grooves 71 are formed in the 2 nd molding portion 7b so as to be recessed radially outward. By this groove 71, a gap is formed between the enlarged portions 21 of the adjacent teeth 2.
When the enlarged portions 21 of the adjacent teeth 2 are formed with a gap therebetween by the grooves 71, the rigidity is reduced in the portion of the 2 nd molding portion 7b, and the resonance frequency of the stator is reduced, whereby the effect of suppressing the occurrence of vibration and noise can be obtained. For example, the width D1 of the groove 71 in the circumferential direction may be less than or equal to 1/2 of the interval D2 between the enlarged portions 21 of the adjacent teeth 2.
In the case of forming the void by the groove 71, the width of the projection 9 formed in the die 8 shown in fig. 9 is formed to be narrower than the interval between the enlarged portions 21 of the adjacent teeth 2. Therefore, the projections 9 can be easily inserted between the enlarged portions 21 of the adjacent teeth 2, and the alignment of the die 8 can be easily performed. This can reduce the manufacturing cost of the synchronous motor 20.
In addition, the length of the slot 71 in the axial direction may be shorter than the length of the stator core 13 in the axial direction. In addition, the lengths of the grooves 71 formed in the plurality of 2 nd molding portions 7b in the axial direction may be different from each other. As described above, the resonance frequency of the stator can be adjusted by the groove 71, and the degree of freedom of adjustment can be improved.
The groove 71 may be formed in a tapered shape having a width varying in the axial direction or a tapered shape having a width varying in the radial direction. In the case where the groove 71 is formed in a tapered shape, the protrusion 9 formed in the die 8 shown in fig. 9 is also formed in a tapered shape. This facilitates removal of the mold 8 after the molding portion 7 is formed, and reduces the manufacturing cost of the synchronous motor 20. In addition, when the groove 71 is formed in a tapered shape having a width varying in the radial direction, it is necessary to have a tapered shape having a width narrowing as going to the radial direction outside in order to facilitate removal of the mold 8.
In forming the molded part 7, a fitting member (not shown) having a smaller rigidity than the molded part 7 may be provided at a portion where the groove 71 is formed. In this case, the fitting member is fitted into the groove 71 after the molding portion 7 is formed. By using the fitting member, it is unnecessary to form the projections 9 on the mold 8, and it is possible to suppress the manufacturing cost of the mold 8 and to extend the life of the mold 8. Further, since the fitting member has a smaller rigidity than the molding portion 7, the rigidity of the 2 nd molding portion 7b is reduced, and the resonance frequency of the stator is changed, whereby the effect of suppressing the occurrence of vibration and noise can be obtained. In addition, in forming the 2 nd molded portion 7b shown in embodiment 1, fitting members may be fitted between the enlarged portions 21 of the adjacent teeth 2.
In embodiment 2, at least 1 of the molded parts 7 may be the 2 nd molded part 7b, or all of the molded parts 7 may be the 2 nd molded part 7b. In the above case, the resonance frequency of the stator is reduced, and the effect of suppressing the occurrence of vibration and noise can be obtained.
Fig. 11 is a diagram showing a modification of the slot unit. As shown in fig. 11, the end in the circumferential direction of the 2 nd unit portion 32 of the slot unit 3 may protrude from the end in the circumferential direction of the enlarged portion 21. For example, the end portion in the circumferential direction of the 2 nd unit portion 32 covers at least a part of the surface of the adjacent teeth 2 where the enlarged portions 21 face each other. In fig. 11, the example is shown in which the protruding portions of the 2 nd unit portion 32 extend along the faces of the enlarged portions 21 that face each other, but may extend along the radially outward faces among the enlarged portions 21. Further, the structure in which the end portion in the circumferential direction of the 2 nd unit portion 32 of the slot unit 3 protrudes from the end portion in the circumferential direction of the enlarged portion 21 may be applied to the slot 14 forming the 1 st molded portion 7a, or may be applied to the slot 14 forming the 2 nd molded portion 7b.
The configuration shown in the above embodiment shows an example of the content of the present invention, and may be combined with other known techniques, and a part of the configuration may be omitted or changed without departing from the scope of the present invention.
Description of the reference numerals
A 1-core seat, 2 teeth, 3 slot units, 4 winding parts, 5 rotor cores, 6 permanent magnets, 7 molding parts, 7a 1 st molding parts, 7b 2 nd molding parts, 8 molds, 8a cylindrical parts, 9 projections, 11 rotors, 12 stators, 13 stator cores, 14 slots, 20 synchronous motors, 21 enlarged parts, 22 protruding parts, 31 1 st unit parts, 32 2 nd unit parts, 71 slots.
Claims (22)
1. A synchronous motor is characterized in that,
having a stator, the stator having:
a cylindrical core print;
a plurality of teeth formed by being circumferentially arranged and protruding from the core print in a radial direction;
a slot unit covering the teeth;
a winding portion formed by winding a wire around the tooth via the slot unit; and
a molding part formed by filling resin between adjacent teeth,
the tooth has: a projection extending radially from the core print; and an enlarged portion extending circumferentially from a front end of the protruding portion,
the slot unit has: a 1 st unit portion that covers a radially inward facing surface of the core print and an outer peripheral surface of the protruding portion; and a 2 nd unit portion covering a radially outward surface of the enlarged portion,
the end in the circumferential direction of the 2 nd unit portion coincides with the end in the circumferential direction of the enlarged portion or covers at least a part of the surfaces of the adjacent teeth where the enlarged portions face each other,
the molding forms a void between the enlarged portions of at least 1 adjacent of the teeth.
2. The synchronous motor according to claim 1, wherein,
the molding part has: a plurality of molding portions 1 filled between the enlarged portions of adjacent teeth; and a plurality of 2 nd molding portions forming the gap between the enlarged portions of adjacent ones of the teeth.
3. The synchronous motor according to claim 2, wherein,
has a rotor disposed inside the stator,
a triangle or polygon shape having a vertex at a midpoint between the tips of the teeth provided on both sides of the 2 nd molding portions, and a shape in which the electromagnetic force when the rotor is rotated deforms the stator, that is, a shape of a spatial pattern of the electromagnetic force, are different.
4. The synchronous motor according to claim 3, wherein,
the number of spaces between the teeth or slots is a multiple of 3 greater than or equal to 6,
the number of poles of the rotor is not a multiple of 3,
the 2 nd molding part is arranged with 120 degree intervals by taking the central axis of the core seat as the center.
5. The synchronous motor according to claim 2 to 4, wherein,
the 2 nd molding portion forms the void by exposing the faces of the enlarged portions of the adjacent teeth that face each other.
6. The synchronous motor according to claim 2 to 4, wherein,
the 2 nd molding portion is joined to the surfaces of the enlarged portions of the adjacent teeth, and the gap is formed by a groove formed so as to be recessed radially outward with respect to the 2 nd molding portion.
7. The synchronous motor according to claim 6, wherein,
the width of the groove is less than or equal to 1/2 of the distance between the enlarged portions of adjacent teeth.
8. The synchronous motor according to claim 6, wherein,
the length of the groove in the axial direction is different from the length of the core print in the axial direction.
9. The synchronous motor according to claim 7, wherein,
the length of the groove in the axial direction is different from the length of the core print in the axial direction.
10. The synchronous motor according to claim 6, wherein,
the grooves formed in the plurality of the 2 nd molding portions are different from each other in length in the axial direction.
11. The synchronous motor according to claim 7, wherein,
the grooves formed in the plurality of the 2 nd molding portions are different from each other in length in the axial direction.
12. The synchronous motor according to claim 8, wherein,
the grooves formed in the plurality of the 2 nd molding portions are different from each other in length in the axial direction.
13. The synchronous motor according to claim 9, wherein,
the grooves formed in the plurality of the 2 nd molding portions are different from each other in length in the axial direction.
14. The synchronous motor according to claim 6, wherein,
the grooves are formed in a tapered shape varying in width in the axial direction or in a tapered shape varying in width in the radial direction.
15. The synchronous motor according to claim 7, wherein,
the grooves are formed in a tapered shape varying in width in the axial direction or in a tapered shape varying in width in the radial direction.
16. The synchronous motor according to claim 8, wherein,
the grooves are formed in a tapered shape varying in width in the axial direction or in a tapered shape varying in width in the radial direction.
17. The synchronous motor according to claim 9, wherein,
the grooves are formed in a tapered shape varying in width in the axial direction or in a tapered shape varying in width in the radial direction.
18. The synchronous motor according to claim 10, wherein,
the grooves are formed in a tapered shape varying in width in the axial direction or in a tapered shape varying in width in the radial direction.
19. The synchronous motor according to claim 11, wherein,
the grooves are formed in a tapered shape varying in width in the axial direction or in a tapered shape varying in width in the radial direction.
20. The synchronous motor according to claim 12, wherein,
the grooves are formed in a tapered shape varying in width in the axial direction or in a tapered shape varying in width in the radial direction.
21. The synchronous motor according to claim 13, wherein,
the grooves are formed in a tapered shape varying in width in the axial direction or in a tapered shape varying in width in the radial direction.
22. The synchronous motor according to any one of claim 1 to 4, wherein,
and a fitting member fitted into the space.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019-096237 | 2019-05-22 | ||
| JP2019096237 | 2019-05-22 | ||
| PCT/JP2020/020012 WO2020235611A1 (en) | 2019-05-22 | 2020-05-20 | Synchronous electric motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113812063A CN113812063A (en) | 2021-12-17 |
| CN113812063B true CN113812063B (en) | 2024-01-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202080006471.7A Active CN113812063B (en) | 2019-05-22 | 2020-05-20 | Synchronous motor |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP6877658B2 (en) |
| CN (1) | CN113812063B (en) |
| DE (1) | DE112020002462T5 (en) |
| WO (1) | WO2020235611A1 (en) |
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|---|---|---|---|---|
| JP3685169B2 (en) * | 2002-09-27 | 2005-08-17 | 株式会社日立製作所 | Rotating machine and manufacturing method thereof |
| JP2008022646A (en) * | 2006-07-13 | 2008-01-31 | Yaskawa Electric Corp | Permanent-magnet motor, stator therefor, and stator manufacturing method |
-
2020
- 2020-05-20 CN CN202080006471.7A patent/CN113812063B/en active Active
- 2020-05-20 JP JP2020556336A patent/JP6877658B2/en active Active
- 2020-05-20 DE DE112020002462.8T patent/DE112020002462T5/en active Pending
- 2020-05-20 WO PCT/JP2020/020012 patent/WO2020235611A1/en active Application Filing
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| TW380329B (en) * | 1997-04-16 | 2000-01-21 | Japan Servo | Permanent-magnet revolving electrodynamic machine with a concentrated winding stator |
| JP2001128393A (en) * | 1999-10-25 | 2001-05-11 | Hitachi Ltd | Dynamo-electric machinery |
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Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2020235611A1 (en) | 2021-06-10 |
| DE112020002462T5 (en) | 2022-02-10 |
| JP6877658B2 (en) | 2021-05-26 |
| CN113812063A (en) | 2021-12-17 |
| WO2020235611A1 (en) | 2020-11-26 |
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