JP6610469B2 - Single phase induction motor - Google Patents

Description

  The present invention relates to a structure of a stator of a single phase induction motor.

  In recent years, in a single-phase induction motor including a stator winding including a main winding coil and an auxiliary winding coil and a capacitor, in order to prevent magnetic saturation of the main winding teeth around which the main winding coil is wound, A single-phase induction motor in which a flange portion at the tip is formed to be 1/2 or more of the circumferential width of the teeth base is disclosed (for example, Patent Document 1). In this single-phase induction motor, the stator winding is wound in a concentrated manner to achieve downsizing, while suppressing the generation of harmonic current due to magnetic saturation and reducing vibration and electromagnetic noise. ing.

JP 2010-130839 A

On the other hand, in the case of a large-capacity single-phase induction motor having a rated speed in the high speed range, the current flowing in the auxiliary winding coil is caused by LC resonance generated by the capacitor capacity and the inductance of the auxiliary winding coil when the slip is small. There was a problem that the efficiency increased and the efficiency decreased.
For this reason, in the conventional single-phase induction motor, in order to reduce the capacitor capacity and the inductance of the auxiliary winding coil, the stator winding is wound with distributed winding in which the inductance is smaller than that of the concentrated winding. Measures were taken to prevent an increase in current flowing in the coil.

  However, in the stator of the distributed winding single-phase induction motor, since the coil end located at the axial end of the stator winding swells greatly in the axial direction, the amount of copper used in the winding increases, and the primary copper There was a problem that loss increased and efficiency decreased.

  The present invention has been made to solve the above-described problems, and reduces the copper loss generated in the auxiliary winding when the stator winding of the single-phase induction motor is a concentrated winding, thereby achieving high efficiency. The object is to obtain a single-phase induction motor that can be driven.

The single-phase induction motor according to the present invention is
A cylindrical core back portion, and a stator core having a plurality of teeth portions circumferentially arranged on the inner periphery of the core back portion and extending radially inward from the core back portion, and wound around each of the tooth portions. stator winding having a co-yl portion of Spun concentrated winding, and a stator having a capacitor,
A rotor disposed rotatably on the inner diameter side of the stator core,
Each of the plurality of tooth portions includes a teeth base portion extending radially inward from the core back portion and wound with a coil portion, a tip portion disposed at an inner diameter side end portion of the teeth base portion, and a periphery from the tip portion. The teeth portion that is extended on both sides in the direction and the end portion in the circumferential direction are spaced apart from each other,
The stator is formed with a slot surrounded by a surface connecting the corners on the outer diameter side at the end portions in the circumferential direction of the flanges of two adjacent teeth portions and a stator core on the outer diameter side from the surface. ,
The plurality of teeth are composed of main winding teeth and auxiliary winding teeth arranged alternately in the circumferential direction.
The coil portion is densely arranged in the cross section of the slot, and in the cross section in which the coil portion of the slot perpendicular to the rotation axis of the rotor is arranged , the center line passing through the rotation axis in the main winding tooth portion and the main winding A cut in the first cross section in which the coil portion of the slot on the auxiliary winding tooth portion side of the bisector of the angle formed by the center line passing through the rotation axis in the auxiliary winding tooth portion adjacent to the tooth portion is disposed. The area is larger than the cross-sectional area in the second cross section where the coil part of the slot on the main winding tooth part side than the bisector is arranged ,
A series body in which a coil portion and a capacitor, which are densely arranged in the first cross section and wound around the auxiliary winding tooth portion, are connected in series, is densely arranged in the second cross section and wound around the main winding tooth portion. It is connected in parallel with the turned coil part .
Also,
A cylindrical core back portion, and a stator core having a plurality of teeth portions circumferentially arranged on the inner periphery of the core back portion and extending radially inward from the core back portion, and wound around each of the tooth portions. A stator winding having a coiled portion of concentrated winding, and a stator having a capacitor;
A rotor disposed rotatably on the inner diameter side of the stator core,
Each of the plurality of tooth portions includes a teeth base portion extending radially inward from the core back portion and wound with a coil portion, a tip portion disposed at an inner diameter side end portion of the teeth base portion, and a periphery from the tip portion. A tooth portion extending on both sides in the direction and a flange portion spaced apart from the circumferential end portion,
The stator is formed with a slot surrounded by a surface that connects the corners on the outer diameter side at the circumferential ends of the flange portions of two adjacent teeth portions, and a stator iron core on the outer diameter side of the surface. ,
The plurality of teeth are composed of main winding teeth and auxiliary winding teeth arranged alternately in the circumferential direction.
When the perpendicular length from the point on the inner diameter side surface at the tip of the teeth part to the rotor rotation axis crosses the gap between the stator and the rotor is the gap length, the main winding teeth part The average value of the gap length of the auxiliary winding teeth portion is larger than the average value of the gap length.

In the single-phase induction motor configured as described above, since the cross-sectional area of the second cross section is larger than the cross-sectional area of the first cross section, the cross-sectional area of the first cross section and the cross-sectional area of the second cross section are The resistance of the coil portion wound around the auxiliary winding tooth portion is smaller than the resistance of the coil portion wound around the auxiliary winding tooth portion when equal . Or, in the single-phase induction motor configured as described above, when the auxiliary winding teeth average gap length is larger than when the main winding teeth average gap length and the auxiliary winding teeth average gap length are equal, The inductance Ls of the auxiliary winding is reduced. For this reason, a copper loss can be reduced and the single phase induction motor which can drive with high efficiency can be obtained.

It is a longitudinal cross-sectional view which shows the single phase induction motor in Embodiment 1 of this invention. It is AA sectional drawing in FIG. 1 of the single phase induction motor in Embodiment 1 of this invention. It is a figure which shows the principal part of the stator in AA sectional drawing of the single phase induction motor in Embodiment 1 of this invention. It is a circuit diagram of the single phase induction motor in Embodiment 1 of this invention. It is a perspective view of the rotor of the single phase induction motor in Embodiment 1 of this invention. It is AA sectional drawing of the rotor of the single phase induction motor in Embodiment 1 of this invention. It is a figure which shows the principal part of the teeth part of the stator in the AA cross section of the single phase induction motor in Embodiment 1 of this invention. It is a figure which shows the principal part of the teeth front-end | tip part of the stator in the AA cross section of the single phase induction motor in Embodiment 1 of this invention. It is AA sectional drawing of the stator of the single phase induction motor in Embodiment 2 of this invention. It is a figure which shows the principal part of the stator in the AA cross section of the single phase induction motor in Embodiment 2 of this invention. It is AA sectional drawing of the stator of the single phase induction motor in Embodiment 3 of this invention. It is a figure which shows the principal part of the stator in the AA cross section of the single phase induction motor in Embodiment 3 of this invention. It is the figure which showed the relationship between the rotation angle of the rotor of the single phase induction motor in this Embodiment 3 and air gap length. It is the figure which showed another example of the relationship between the rotation angle of the rotor of the single phase induction motor and gap length in Embodiment 3 of this invention. It is AA sectional drawing of the stator of the single phase induction motor in Embodiment 4 of this invention. It is a figure which shows the principal part in the AA cross section of the single phase induction motor in Embodiment 4 of this invention. It is the figure which showed the relationship between the rotation angle of the rotor of the single phase induction motor in this Embodiment 4 and air gap length. It is AA sectional drawing of the stator of the single phase induction motor in Embodiment 5 of this invention.

Embodiment 1 FIG.
Hereinafter, a single-phase induction motor according to Embodiment 1 of the present invention will be described with reference to FIGS.
1 is a longitudinal sectional view showing a single-phase induction motor according to Embodiment 1 for carrying out the present invention. The longitudinal sectional view is a sectional view in a plane including the rotation center of the single phase induction motor 100. A single-phase induction motor 100 in FIG. 1 is an induction motor driven by a single-phase AC power source. In FIG. 1, a single-phase induction motor 100 includes an annular stator 2, a rotor 3 that is disposed on the inner diameter side of the stator 2, and is rotatably arranged with respect to the stator 2, and the stator 2. And a frame 1 that supports the rotor 3. The rotor 3 is fixed to the rotating shaft 4. The center line of the frame 1 and the rotation axis that is the center line of the rotation shaft 4 are aligned and arranged coaxially. The rotor 3 is rotatably supported on the frame 1 via a sleeve 5.

  FIG. 2 is a cross-sectional view of the single phase induction motor according to the present embodiment taken along the line AA in FIG. The stator 2 includes an annular stator core 6 that surrounds the outer diameter side of the rotor 3, a stator winding 50, and a capacitor 28 (not shown). The stator 2 is fitted to and supported by the inner periphery of the frame 1 and is arranged coaxially with the rotor 3. The rotor 3 is rotatably disposed on the inner diameter side of the stator core 6.

  The stator core 6 is configured by laminating a plurality of electromagnetic steel plates made of a magnetic material in the rotation axis direction of the rotation shaft 4. The stator core 6 includes a cylindrical core back portion 12 and eight teeth portions 60. The teeth portions 60 are arranged on the inner periphery of the core back portion 12 at intervals in the circumferential direction, and extend from the core back portion 12 inward in the radial direction. In FIG. 2, the intervals between the tooth portions 60 are equal. The extension of the center line 11 of each tooth portion 60 passes through the rotation axis that is the center 13 of the rotor 3. The eight tooth portions 60 include four main winding tooth portions 7 and four auxiliary winding tooth portions 8. The main winding tooth portion 7 and the auxiliary winding tooth portion 8 are alternately arranged in the circumferential direction. Therefore, in the single phase induction motor 1, the number of the tooth portions 60 is a multiple of two.

The stator winding 50 includes eight coil portions 40 with concentrated winding wound around each of the eight tooth portions 60. The eight coil portions 40 are composed of four main winding coil portions 9-1 and four auxiliary winding coil portions 10-1. The four main winding coil portions 9-1 are wound around the main winding tooth portion 7, respectively. The four auxiliary winding coil portions 10-1 are wound around the auxiliary winding tooth portion 8, respectively. Therefore, the main winding 9 and the auxiliary winding 10 are alternately arranged at equal intervals in the circumferential direction.
In FIG. 2, the main winding tooth portion 7 is denoted by M, and the auxiliary winding tooth portion 8 is denoted by S. Further, “−” in M− and S− indicates that the direction of the magnetic flux is opposite. For example, the direction of the magnetic flux is reversed when the winding direction is opposite or when the current application direction is reversed. Coil portions 40 are arranged in the order of M, S-, M-, and S in the counterclockwise direction when viewed from the direction perpendicular to the paper surface.

The four main winding coil portions 9-1 are connected to form the main winding 9, and the four auxiliary winding coil portions 10-1 are connected to configure the auxiliary winding 10. The main winding 9 and the auxiliary winding 10 are connected to form a stator winding 50.
When the main winding 9 and the auxiliary winding 10 are energized, a rotating magnetic field is generated in the stator 2. The rotor 3 rotates around the rotation axis of the rotation shaft 4 by the rotating magnetic field of the stator 2.

  FIG. 3 is a diagram showing a main part of the stator in the AA cross-sectional view of the single-phase induction motor in the present embodiment. In FIG. 3, the main winding tooth portion 7 includes a main winding tooth base portion 17 having a predetermined circumferential width 18 and a main winding tooth tip portion 19 disposed at an inner diameter side end portion of the main winding tooth base portion 17. And an adjacent tooth portion 60 extending from the main winding tooth tip 19 to both sides in the circumferential direction and a main winding tooth flange portion 20 having a circumferential end spaced apart. The main winding tooth flange 20 gradually decreases in thickness in the radial direction toward the extending direction from the main winding tooth tip 19.

  Similarly, the auxiliary winding tooth portion 8 includes an auxiliary winding tooth base portion 23 having a predetermined circumferential width 24, and an auxiliary winding tooth tip portion 25 disposed at the inner diameter side end portion of the auxiliary winding tooth base portion 23. The auxiliary winding teeth end portion 25 is extended to both sides in the circumferential direction, and adjacent teeth portions 60 and the auxiliary winding teeth flange portion 26 are spaced apart from each other in the circumferential direction. The auxiliary winding teeth flange 26 gradually decreases in thickness in the radial direction toward the extending direction from the auxiliary winding teeth tip 25.

  That is, each of the eight tooth portions 60 includes a teeth base portion 17 and 23 that extends radially inward from the core back portion 12 and has a coil portion 40 wound thereon, and an inner diameter side end portion of the teeth base portion 17 and 23. The teeth tip portions 19 and 25 are disposed on the left side, the teeth portion 60 is extended from the tip portion on both sides in the circumferential direction, and the teeth flange portions 20 and 26 are spaced apart from each other in the circumferential direction.

  Since the stator 2 according to the present embodiment has eight teeth, the angle formed by the center line 15 of the main winding teeth and the center line 21 of the auxiliary winding teeth is 45 ° in mechanical angle.

Here, the definition of the slot cross-sectional area will be described with reference to FIG.
The stator 2 includes a corner A on the outer diameter side at a circumferential end of the main winding tooth flange 20 and a circumferential end of the auxiliary winding tooth flange 26 adjacent to the main winding tooth flange 20. A slot surrounded by a surface connecting the corner B on the outer diameter side and a stator core on the outer diameter side of the surface is formed.

In the cross section of the slot perpendicular to the rotation axis of the rotor 3, the cross-sectional area As in the cross section 22 of the slot around which the auxiliary winding 10 is wound has a center line 15 passing through the rotation axis in the main winding tooth portion 7 and the main line 15. The bisector of the angle formed by the center line 21 passing through the rotation axis in the auxiliary winding tooth portion 8 adjacent to the winding tooth portion 7, that is, a line rotated 22.5 ° clockwise from the center line 15. The cross-sectional area in the first cross section 22 of the slot on the auxiliary winding tooth portion 8 side from the bisector 14 which is a line rotated counterclockwise by 22.5 ° from the center line 21.
Further, in the cross section of the slot perpendicular to the rotation axis of the rotor 3, the cross sectional area Am in the cross section 16 of the slot around which the main winding 9 is wound is the slot on the main winding tooth portion 7 side of the bisector 14. It is a cross-sectional area in the second cross section 16.

  The four main winding coil portions 9-1 are densely arranged on the second cross section 16 of the slot, respectively, and are wound around the main winding tooth portion 7. The four auxiliary winding coil portions 10-1 are densely arranged on the first cross section 22 of the slot, and are wound around the auxiliary winding tooth portion 8. Here, “the coil portion is densely arranged in the cross section of the slot” means that the coil portion 60 is arranged so as to fit in the first cross section 22 or the second cross section 16 of the slot as much as possible. Means that.

FIG. 4 is a circuit diagram of the single-phase induction motor in the present embodiment. The series body in which the auxiliary winding 10 composed of the four auxiliary winding coil sections 10-1 and the capacitor 28 are connected in series includes the main winding 9 composed of the four main winding coil sections 9-1, and A single-phase AC power supply 27 is connected in parallel with each other.
Further, the auxiliary winding current Is flowing in the auxiliary winding 9 has a current phase advanced by about 90 ° from the main winding current Im flowing in the main winding by the capacitor 28. As a result, a rotating magnetic field is generated in the rotation directions of M, S-, M-, and S. An ideal rotating magnetic field can be obtained when the phase of the auxiliary winding current Is advances by 90 ° with respect to the main winding current Im.

FIG. 5 is a perspective view of the rotor of the single-phase induction motor in the present embodiment. The rotor 3 shown in FIG. 5 rotates a cylindrical rotor core 29, a plurality of conductor bars 30 arranged at equal intervals in the circumferential direction on the outer peripheral surface side of the rotor core 29, and a plurality of conductor bars 30. It comprises a short-circuit ring 31 that is short-circuited at both axial ends of the core core 29.
The short-circuit ring 31 is made of a conductor such as aluminum or copper, and each conductor rod 30 is short-circuited at both axial ends of the rotor 3.

The conductor rod 30 is made of a conductor such as aluminum or copper, and is inserted into the groove portion of the rotor core 29. The conductor rod 30 is skewed with a certain angle with respect to the rotation axis.
The conductor rod 30 and the short-circuit ring 31 may be manufactured by a die casting method in which molten metal is poured into the groove portion 41 and both axial end portions of the rotor core 29. Alternatively, the metal rod may be formed by inserting a metal rod into the groove portion 41 of the adjacent rotor core 29 and soldering or brazing both ends of the metal rod to the metal short-circuit ring 31. Further, in order to reduce the resistance of the conductor rod 30, a metal rod having a low resistivity such as a rod made of copper is inserted into the groove portion 41 of the rotor core 29, and then the conductor rod 30 and the short-circuit ring 31 are die-cast. May be created.

  FIG. 6 is a cross-sectional view taken along line AA of the rotor of the single-phase induction motor in the present embodiment. The rotor core 29 is configured by laminating a plurality of electromagnetic steel plates made of a magnetic material in the rotation axis direction of the rotation shaft 4. The rotor core 29 protrudes radially outward from the annular back yoke portion 32 fitted to the outer peripheral surface of the rotating shaft 4 and from the back yoke portion 32, and is spaced from each other in the circumferential direction of the rotor core 29. And a plurality of rotor teeth portions 33 placed and disposed. The rotor teeth 33 are arranged at equal intervals in the circumferential direction of the rotor core 29.

  FIG. 7 is a diagram showing a main part of the teeth portion of the stator in the AA cross section of the single-phase induction motor in the present embodiment. In the cross section of FIG. 7, the flange thickness h1 of the main winding tooth portion 7 is defined by the intersection M1 of the circumferential side surface of the main winding tooth base portion 17 and the outer diameter side surface of the main winding tooth flange portion 20 and the rotation axis. It is defined by the radial length of the cross section in which the main winding tooth tip 19 is cut by the plane including. Similarly, the flange thickness h2 of the auxiliary winding teeth portion 8 is a surface including the intersection M2 of the circumferential side surface of the auxiliary winding teeth base 23 and the outer diameter side surface of the auxiliary winding teeth flange portion 26 and the rotation axis. Is defined by the radial length of the cross section of the auxiliary winding tooth tip 25 cut.

  FIG. 8 is a diagram showing the main part of the tooth tip of the stator in the AA cross section of the single-phase induction motor in the present embodiment. In FIG. 8, the main winding tooth front end surface 38 and the auxiliary winding tooth front end surface 39, which are surfaces facing the rotor 3, are the inner peripheral surfaces of the main winding tooth front end portion 19 and the auxiliary winding tooth front end portion 26, respectively. And is formed in an arc shape such that the distance from the surface of the rotor 3 is constant. The radius of the circumferential surface 34 formed by the main winding tooth tip surface 38 is equal to the radius of the circumferential surface formed by the auxiliary winding tooth tip surface 39. It should be noted that the radius of the circumferential surface formed by the auxiliary winding tooth tip surface 39 may be different from the radius of the circumferential surface 34 of the main winding tooth tip surface 38. Further, as will be described later, the collar thickness h2 of the auxiliary winding tooth portion 8 is smaller than the collar thickness h1 of the main winding tooth portion 7.

  Since the flange thickness h2 of the auxiliary winding tooth portion 8 is smaller than the flange thickness h1 of the main winding tooth portion 7, the slot of the slot in which the auxiliary winding 10 having the cross-sectional area of the first cross section 22 in FIG. The cross-sectional area As in the cross-section 22 is larger than the cross-sectional area Am in the cross-section 16 of the slot in which the main winding 9 which is the cross-sectional area of the second cross-section 16 is wound. The wire diameter of the winding can be increased, and the resistance of the auxiliary winding 10 can be reduced.

In the conventional single-phase induction motor, LC resonance occurs in the auxiliary winding 10 and the capacitor 28 and the auxiliary winding current Is increases during high-speed driving with small slip. For this reason, there exists a subject that the copper loss of the auxiliary | assistant winding 10 increases and efficiency falls.
In the single phase induction motor 100 according to the present embodiment, the resistance of the auxiliary winding 10 can be lowered without changing the number of turns of the auxiliary winding 10, and the copper loss of the auxiliary winding 10 during high-speed driving with small slip Is reduced.

Embodiment 2. FIG.
Next, another embodiment of the first embodiment will be described with reference to FIGS. 9 to 18 in the second and subsequent embodiments.

FIG. 9 is an AA cross-sectional view of the stator of the single-phase induction motor according to Embodiment 2 for carrying out the present invention. FIG. 10 is a diagram showing the main part of the stator in the AA cross section of the single-phase induction motor in the present embodiment.
9 and 10, the single-phase induction motor 101 according to the present embodiment is different from the single-phase induction motor 100 according to the first embodiment in the following points.

In FIG. 10, the tip angle θ <b> 2 at both ends in the circumferential direction of the auxiliary winding tooth flange 26 is smaller than the tip angle θ <b> 1 at both ends in the circumferential direction of the main winding tooth flange 20. Further, the leading end angle θ1 of the main winding tooth flange 20 is larger than 45 °, which is an angle formed by the center line 15 of the main winding tooth portion 7 and the center line 21 of the auxiliary winding tooth portion 8. The circumferential width 24 of the auxiliary winding tooth base 23 of the auxiliary winding tooth portion 8 is smaller than the circumferential width 18 of the main winding tooth base 17 of the main winding tooth portion 7.
Therefore, even if θ2 is reduced, the slot area As22 can be made larger than the slot area As22 of the first embodiment.

As shown in FIG. 10, the main winding tooth flange 20 assists the bisector 14 at the angle formed by the center line 15 of the main winding tooth portion 7 and the center line 21 of the auxiliary winding tooth portion 8. Even when the winding teeth portion 8 side is exceeded, the cross-sectional area As in the cross section 22 of the slot around which the auxiliary winding 10 is wound is larger than that of the bisector 14 in the same manner as in the first embodiment. It is a cross-sectional area in the first cross section 22 of the slot on the side. The cross-sectional area Am in the cross section 16 of the slot in which the main winding 9 is wound is the cross-sectional area in the second cross section 16 of the slot closer to the main winding tooth portion 7 than the bisector 14.
Therefore, by increasing the wire diameter of the auxiliary winding 10 without changing the number of turns of the auxiliary winding 10, the resistance of the auxiliary winding 10 can be reduced as compared with the case of the first embodiment. For this reason, a high-efficiency single-phase induction motor can be realized even during high-speed driving where the current Is flowing through the auxiliary winding 10 is large.

Embodiment 3 FIG.
FIG. 11 is an AA cross-sectional view of the stator of the single-phase induction motor according to Embodiment 3 for carrying out the present invention. FIG. 12 is a diagram showing the main part of the stator in the AA cross section of the single-phase induction motor in the present embodiment.
11 and 12, the single-phase induction motor 102 according to the present embodiment is different from the single-phase induction motor 100 according to the first embodiment in the following points.

  In FIG. 12, the perpendicular line from the point on the inner diameter side surface of the main winding tooth tip 19 or the main winding tooth flange 20 to the rotation axis is the main gap that is the gap between the stator 2 and the rotor 3. The length across the winding tooth gap 35 is defined as the main winding teeth gap length gm. Further, the auxiliary winding in which the perpendicular from the point on the inner diameter side surface of the auxiliary winding tooth tip 25 or the auxiliary winding tooth flange 26 to the rotation axis is a gap between the stator 2 and the rotor 3. The length across the tooth gap 36 is defined as the auxiliary winding tooth gap length gs. The main winding tooth average gap length gmave defined by gmave = ∫gm · dθ / θ1 is smaller than the auxiliary winding tooth average gap length gsave defined by gsave = ∫gs · dθ / θ2. That is, the auxiliary winding teeth average gap length gsave, which is the average value of the gap lengths of the auxiliary winding teeth, is larger than the main winding teeth average gap length gmave, which is the average value of the gap lengths of the main winding teeth.

  FIG. 13 is a diagram showing the relationship between the rotation angle of the rotor of the single-phase induction motor and the gap length in the present embodiment. In FIG. 13, the horizontal axis represents the rotation angle of the rotor, and the vertical axis represents the gap length between the stator 2 and the rotor 3. In the present embodiment, the main winding teeth gap length gm and the auxiliary winding teeth gap length gs do not change depending on the rotation angle of the rotor 3, so that gm = gmave and gs = gsave. Further, the gap length gs of the auxiliary winding tooth portion 8 is not less than the gap length gm of the main winding tooth portion 7.

  FIG. 14 is a diagram showing another example of the relationship between the rotation angle of the rotor of the single-phase induction motor and the gap length in the present embodiment. In FIG. 14, as in FIG. 13, the horizontal axis represents the rotation angle of the rotor, and the vertical axis represents the gap length between the stator 2 and the rotor 3. As shown in FIG. 14, gm and gs may vary with respect to the rotation angle. If gmave is smaller than gsave, there may be an angle where gm exceeds gs.

  When the auxiliary winding teeth average gap length gsave is larger, the inductance Ls of the auxiliary winding 10 becomes smaller than when the main winding teeth average gap length gmave is equal to the auxiliary winding teeth average gap length gsave. Therefore, the frequency ω = 1 / √ (Ls · C) of the LC resonance between the auxiliary winding 10 and the capacitor 28 is increased. For this reason, even when the slip is small, an increase in the current of the auxiliary winding 10 can be prevented. Therefore, a copper loss is reduced and a highly efficient single phase induction motor is realizable.

Embodiment 4 FIG.
FIG. 15 is an AA cross-sectional view of the stator of the single-phase induction motor according to the fourth embodiment for carrying out the present invention. FIG. 16 is a diagram showing a main part of the stator in the AA cross section of the single-phase induction motor in the present embodiment.
15 and 16, the single-phase induction motor 103 according to the present embodiment is different from the single-phase induction motor 100 according to the first embodiment in the following points.

  In FIG. 16, in the present embodiment, the gs of the auxiliary winding tooth flange 26 is larger than the gm of the main winding teeth flange 20. The definitions of main winding teeth gap length gm, auxiliary winding teeth gap length gs, main winding teeth average gap length gmave, and auxiliary winding teeth average gap length gsave are the same as in the third embodiment.

FIG. 17 is a diagram showing the relationship between the rotation angle of the rotor of the single-phase induction motor and the gap length in the present embodiment. In the present embodiment, the main winding teeth gap length gm is uniform, and the auxiliary winding teeth gap length gs at the auxiliary winding teeth tip 25 is equal to gm. For this reason, gmave becomes smaller than gsave. Therefore, as in the third embodiment, a highly efficient single-phase induction motor with reduced copper loss can be realized.
Further, since the gs of the auxiliary winding tooth flange 26 is larger than the gm of the main winding teeth flange 20, the main winding 9 or the auxiliary in the stator 2 with respect to the rotation angle of the rotor 3. The change in magnetic flux interlinking with the winding 10 is reduced. Therefore, the torque pulsation during energization caused by the change in magnetic flux can be reduced.

Embodiment 5 FIG.
FIG. 18 is a cross-sectional view of the stator of the single-phase induction motor according to Embodiment 5 for carrying out the present invention, taken along the line AA.
In FIG. 18, the single-phase induction motor 104 according to the present embodiment is different from the single-phase induction motor 100 according to the first embodiment in the following points.

  In FIG. 18, the magnetic material 37 constituting the auxiliary winding tooth portion 8 is lower than the relative permeability of the magnetic material constituting the main winding tooth portion 7. As the magnetic material 37 of the auxiliary winding tooth portion 8, a material having a reduced relative magnetic permeability due to deterioration of magnetic characteristics due to punching or caulking may be used. Therefore, when the inductance of the auxiliary winding 10 is lower than that of the magnetic material having the same relative permeability as that of the main winding tooth portion 7 and the capacitance of the capacitor 28 and the number of turns of the auxiliary winding 10 do not change. The LC resonance frequency between the auxiliary winding 10 and the capacitor 28 is increased. In this case, the rotational speed at which the capacitor 28 and the auxiliary winding 10 resonate is higher than the synchronous speed of the single-phase induction motor 104. For this reason, even when the slip of the single phase induction motor 104 is small, an increase in the current of the auxiliary winding 10 can be prevented. Therefore, the copper loss of the auxiliary winding 10 when the slip is small can be reduced, and a highly efficient single-phase induction motor can be realized.

  Note that the single-phase induction motors 100 to 104 according to Embodiments 1 to 5 may be combined as appropriate and used for the single-phase induction motor.

  1 Frame, 2 Stator, 3 Rotor, 4 Rotating shaft, 5 Sleeve, 6 Stator core, 7 Main winding teeth, 8 Auxiliary winding teeth, 9 Main winding, 9-1 Main winding coil , 10 auxiliary winding, 10-1 auxiliary winding coil section, 11 center line, 12 core back section, 13 center, 14 bisector, 15 center winding tooth section center line, 16 main winding are wound Cross section of slot (second cross section), 17 main winding teeth base, 18 circumferential width of main winding teeth, 19 main winding teeth tip, 20 main winding teeth ridge, 21 auxiliary winding teeth , 22 Auxiliary winding teeth base section, 24 Auxiliary winding teeth base section, 24 Auxiliary winding teeth section circumferential width, 25 Auxiliary winding teeth tip section, 6 Auxiliary winding teeth collar, 27 Single-phase AC power supply, 28 Capacitor, 29 Rotor core, 30 Conductor rod, 31 Short-circuit ring, 32 Back yoke, 33 Rotor teeth, 34 Circumference formed by the front end surface of the main winding teeth 35, Main winding teeth gap, 36 Auxiliary winding teeth gap, 37 Magnetic material having lower relative permeability than the material constituting the main winding teeth, 38 Main winding teeth tip face, 39 Auxiliary winding teeth tip face , 40 coil part, 41 groove part, 50 stator winding, 60 teeth part, 100, 101, 102, 103, 104 single-phase induction motor.

Claims (10)

A stator core having a cylindrical core back portion, and a plurality of teeth portions that are circumferentially arranged on the inner periphery of the core back portion and extend radially inward from the core back portion; A stator winding having a coil portion of concentrated winding wound around each, and a stator having a capacitor;
A rotor disposed rotatably on the inner diameter side of the stator iron core,
Each of the plurality of tooth portions includes a teeth base portion extending radially inward from the core back portion and wound with the coil portion, and a tooth tip portion disposed at an inner diameter side end portion of the teeth base portion. , The tooth portion extending from the tooth tip portion on both sides in the circumferential direction and adjacent to the teeth portion and the circumferential edge portion are separated from each other,
The stator is surrounded by a surface that connects the corners on the outer diameter side at the circumferential end portions of the two teeth portions adjacent to each other and a stator iron core on the outer diameter side of the surface. Slot was formed,
The plurality of teeth portions are composed of main winding teeth portions and auxiliary winding teeth portions alternately arranged in the circumferential direction,
The coil portion is densely arranged in a cross section of the slot, and a center passing through the rotation axis in the main winding tooth portion in a cross section in which the coil portion of the slot perpendicular to the rotation axis of the rotor is arranged The coil portion of the slot on the side of the auxiliary winding tooth portion with respect to a bisector of an angle formed by a line and a center line passing through the rotation axis in the auxiliary winding tooth portion adjacent to the main winding tooth portion Is larger than the cross-sectional area in the second cross-section in which the coil portion of the slot on the main winding tooth portion side than the bisector is arranged ,
A series body in which the coil unit and the capacitor, which are densely arranged in the first cross section and wound around the auxiliary winding tooth part, are connected in series, is densely arranged in the second cross section and the main body. A single-phase induction motor connected in parallel with the coil section wound around the winding tooth section.   In a cross section perpendicular to the rotation axis of the rotor, a cross section in which the teeth collar is cut by a plane including an intersection of a circumferential side surface of the teeth base and an outer diameter side surface of the teeth collar and the rotation axis 2. The single-phase induction motor according to claim 1, wherein the thickness of the auxiliary winding teeth portion is smaller than the thickness of the flange portion of the main winding teeth portion when the radial length of the auxiliary winding teeth portion is defined as the thickness of the flange portion. . The circumferential width of the auxiliary winding teeth portion in the teeth base is smaller than the circumferential width of the main winding teeth portion in the teeth base,
The tip angle of the circumferential direction both ends in the teeth collar part of the auxiliary winding teeth part is smaller than the tip angle of both ends in the circumferential direction in the teeth collar part of the main winding teeth part. Single-phase induction motor described in 1.   The tip angle of the both ends in the circumferential direction of the teeth brim portion of the main winding tooth portion is the auxiliary winding teeth adjacent to the center line passing through the rotation axis in the main winding tooth portion and the main winding tooth portion. The single-phase induction motor according to claim 3, wherein the single-phase induction motor is larger than an angle formed by a center line passing through the rotation axis in a section.   The surface which connects the corner | angular parts of the outer diameter side in the circumferential direction edge part of the said teeth collar part of two said adjacent teeth parts exists in the said auxiliary | assistant winding teeth side rather than the said bisector. Single phase induction motor.   6. The single-phase induction motor according to claim 4, wherein the tooth flange portion of the main winding tooth portion exceeds the auxiliary winding teeth side with respect to the bisector. When the length of a perpendicular line from the point on the inner diameter side surface of the tooth tip of the teeth portion to the rotation axis crosses the gap between the stator and the rotor is the gap length, the main winding The single-phase induction motor according to any one of claims 1 to 6 , wherein an average value of the gap length of the auxiliary winding tooth portion is larger than an average value of the gap length of the wire teeth portion.   A stator core having a cylindrical core back portion, and a plurality of teeth portions that are circumferentially arranged on the inner periphery of the core back portion and extend radially inward from the core back portion; A stator winding having a coil portion of concentrated winding wound around each, and a stator having a capacitor;
  A rotor disposed rotatably on the inner diameter side of the stator iron core,
  Each of the plurality of tooth portions includes a teeth base portion extending radially inward from the core back portion and wound with the coil portion, and a tooth tip portion disposed at an inner diameter side end portion of the teeth base portion. The teeth portion extending from both ends of the tooth in the circumferential direction and adjacent to each other, and the teeth flange portion in which the circumferential end portion is spaced apart,
  The stator is surrounded by a surface that connects the corners on the outer diameter side at the circumferential end portions of the two teeth portions adjacent to each other and a stator iron core on the outer diameter side of the surface. Slot was formed,
  The plurality of teeth portions are composed of main winding teeth portions and auxiliary winding teeth portions alternately arranged in the circumferential direction,
  When the length from the point on the inner diameter side surface of the teeth portion of the teeth portion to the rotation axis of the rotor crosses the gap between the stator and the rotor is the gap length, A single-phase induction motor in which an average value of the air gap length of the auxiliary winding tooth portion is larger than an average value of the air gap length of the main winding tooth portion. 9. The single-phase induction motor according to claim 7 , wherein the gap length in the teeth brim portion of the auxiliary winding tooth portion is larger than the gap length in the teeth brim portion of the main winding tooth portion. The main winding teeth and the auxiliary winding teeth are made of a magnetic material,
The relative permeability of the auxiliary winding tooth portion is a single-phase induction motor according to any one of claims 1 to 9 is smaller than the relative magnetic permeability of the main winding teeth.

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