JP5974592B2 - Armature and motor - Google Patents

Description

  The present invention relates to an armature and an electric motor.

Conventionally, a motor capable of changing the rotation speed has been manufactured by devising a winding method. Japanese Patent Laid-Open No. 2001-186733 describes an induction motor that can change speed by applying a reduction winding to either a tooth around which a main winding is wound or a tooth around which an auxiliary winding is wound. Has been.
JP 2001-186733 A

  However, since there is only one type of reduction winding wound in Japanese Patent Laid-Open No. 2001-186733, the motor speed can be switched only in two stages, and the motor speed cannot be changed finely and smoothly.

  The main object of the present invention is to finely and smoothly change the speed of a motor in a single-phase induction motor including a main winding and an auxiliary winding.

An exemplary first invention of the present application includes a rotating portion, a stationary portion having a stator, and a bearing portion that supports the rotating portion so as to be rotatable about a central axis with respect to the stationary portion, and the stator An annular core back centering on a central axis extending vertically, a stator core composed of a plurality of teeth extending radially inward from the core back, and a plurality of coils respectively formed on the plurality of teeth. A plurality of main coils formed by main windings in which a plurality of coils are wound around every other tooth while reversing the winding direction, and every other tooth is connected to every other tooth. A plurality of first auxiliary coils formed by first auxiliary windings wound while reversing the winding direction on the teeth positioned between, and at least the plurality of main coils or the To either of the first auxiliary coil number, the lap winding two or more auxiliary windings, among the plurality of teeth, beginning or end of the main winding, or of the first auxiliary winding The teeth from which the start ends or terminations are drawn out and the teeth from which the start ends or terminations of the multiple auxiliary windings are drawn out are the same teeth, and the teeth in the vicinity of the same teeth A plurality of binding pins extending in one axial direction are arranged on one end surface in the axial direction of the insulator, and the main winding starts or ends, or the first auxiliary winding starts or ends, and the auxiliary winding. Is a single-phase induction motor in which the starting end or the terminal end is wound around each of the plurality of binding pins .

  According to the first exemplary invention of the present application, in a single-phase induction motor including a main winding and an auxiliary winding, the speed of the motor can be finely and smoothly changed.

FIG. 1 is a longitudinal sectional view of a single-phase induction motor according to an embodiment. FIG. 2 is a plan view of the stator core. FIG. 3 is a plan view of the stator. FIG. 4 is a diagram showing the winding state in a simplified manner. FIG. 5 is a perspective view of the core element and the insulator. FIG. 6 is a perspective view of the core element, the insulator, and the coil. FIG. 7 is a perspective view of the core element, the insulator, and the coil as viewed from the rotor side. FIG. 8 is a plan view of the stator on which the wiring board is disposed as viewed from above. FIG. 9 is a plan view of the wiring board as seen from the back side.

  In the present specification, the upper side in the direction of the central axis J1 of the motor 1 shown in FIG. 1 is simply referred to as “upper side”, and the lower side is simply referred to as “lower side”. Note that the vertical direction does not indicate the positional relationship or direction when incorporated in an actual device. A direction parallel to the central axis J1 is referred to as an “axial direction”, a radial direction centered on the central axis is simply referred to as “radial direction”, and a circumferential direction centered on the central axis is simply referred to as “circumferential direction”. .

FIG. 1 shows a single-phase induction motor 1 (hereinafter “motor 1”) according to an exemplary embodiment of the present invention.
That's it. FIG. The motor 1 is preferably used for an air conditioner, an air purifier, a humidifier, or a blower. The motor 1 is an inner rotor type, and rotates when a single-phase alternating current is input. The motor 1 includes a stationary part 2, a rotating part 3, and a bearing part 4. The bearing portion 4 supports the rotating portion 3 so as to be rotatable with respect to the stationary portion 2 around the central axis J1. The bearing portion 4 includes a first ball bearing 41 and a second ball bearing 42 disposed below the first ball bearing 41.

The stationary part 2 includes a first bearing support part 211, a second bearing support part 212, a stator 22, and a resin mold 23. The resin mold 23 covers other than the tip end surface of the teeth of the stator 22, that is, other than the inner peripheral surface of the stator 22. The first bearing support portion 211 is molded by pressing a plate member. The first bearing support portion 211 includes a central portion 51, a flat plate portion 52,
Flange portion 53. The central part 51 has a substantially cylindrical shape with a lid. The first in the central part 51
The ball bearing 41 is held. The flat plate portion 52 extends annularly from the lower end of the central portion 51 outward in the radial direction. The flange portion 53 rises upward from the outer edge portion of the flat plate portion 52, and further spreads in a ring shape radially outward. The flange portion 53 is fitted into the resin mold 23 so as to contact the inner peripheral surface and the upper surface of the resin mold 23.

The second bearing support portion 212 is molded by pressing a plate member. Second bearing support 2
12 is a substantially cylindrical shape with a bottom, and has an opening in the center. The second bearing support portion 212 is disposed in the resin mold 23 by insert molding so that the lower surface and the outer peripheral surface of the second bearing support portion 212 are in contact with the resin mold 23. The second ball bearing 42 is held on the inner peripheral surface of the second bearing support portion 212.

The stator 22 includes a stator core 221, a resin insulator 222, and a plurality of coils 223. Details of the stator 22 will be described later.

The rotating unit 3 includes a shaft 31, a rotor core 32, and an end ring 33. The shaft 31 is supported by the first ball bearing 41 and the second ball bearing 42 so as to be rotatable about the central axis J1. The output end of the shaft 31 protrudes downward from the opening of the second bearing support portion 212. The rotor core 32 is formed of laminated steel plates and is arranged on the radially inner side of the stator 22. The end rings 33 are annularly provided on the upper and lower surfaces of the rotor core 32. In the rotor core 32, a plurality of axially extending spaces are arranged in the circumferential direction. These spaces are filled with metal when the end ring 33 is molded by die casting. A squirrel-cage rotor is formed by connecting the end ring 33 to the metal filled in the rotor core 32.

FIG. 2 is a plan view of the stator core 221. The outer shape of the stator core 221 is a substantially octagon centered on the central axis J1. The stator core 221 is formed by laminating a plurality of thin magnetic steel plates. The stator core 221 includes eight teeth 61 and an annular core back 6.
2 and. The teeth 61 extend radially inward from the core back 62 toward the rotor core 32. Further, the umbrella portion 611 on the tip side of each tooth 61 spreads on both sides in the circumferential direction. That is, the circumferential width of the umbrella portion 611 is larger than the circumferential width of other portions of the tooth 61. The inner peripheral surface of the umbrella portion 611 faces the outer peripheral surface of the rotor core 32 in the radial direction.

  The stator core 221 is a set of a plurality of core elements 60. Each of the plurality of core elements 60 includes one tooth 61 and a core back element 621. The core back element 621 is a 1/8 portion of the core back 62 and corresponds to one tooth 61. The core back element 621 extends from the root of the tooth 61 to the left and right and is approximately linear.

  The core back elements 621 adjacent to each other are connected by a minute connecting portion 622. FIG. 2 shows an annular stator core 221 formed by bending the stator core 221 at the connecting portion 622. The core back elements 621 that are not connected by the connecting portion are joined together by welding. The connecting portion 622 is located substantially radially outside the core back element 621 and on both sides or one side in the circumferential direction.

  FIG. 3 is a plan view of the stator 22. The stator core 221 is covered with a resinous insulator 222 except for the outer peripheral surface and the vicinity of the outer peripheral surface and the inner peripheral surface and the vicinity of the inner peripheral surface. The plurality of coils 223 are respectively formed on the plurality of teeth 61. In the stator 22, the coil 223 is formed by so-called concentrated winding.

  FIG. 4 is a diagram showing the winding state of the eight teeth 61 in a simplified manner. The winding is composed of a main winding 80 and three types of auxiliary windings. The three types of auxiliary windings are a first auxiliary winding 81, a second auxiliary winding 82, and a third auxiliary winding 83. A thick solid line indicates the main winding 80, a dotted line indicates the first auxiliary winding 81, a one-dot chain line indicates the second auxiliary winding 82, and a two-dot chain line indicates the third auxiliary winding 83. A state in which the main winding 80 and the three types of auxiliary windings are wound around the tooth 61 a plurality of times to form the coil 223 is omitted.

  The main winding 80 and the three types of auxiliary windings are each one continuous wire. A plurality of main coils 801 are formed by winding the main winding 80 around every other tooth 61 while reversing the winding direction. Each of the three types of auxiliary windings is wound around the teeth 61 positioned between the teeth 61 where the main coil 801 is formed while reversing the winding direction. The winding directions of the three types of auxiliary windings are the same. Each of the three types of auxiliary windings has a different number of turns per tooth. The specific number of turns of each auxiliary winding is changed according to the specification of the number of rotations. Thereby, a plurality of first auxiliary coils 811, second auxiliary coils 821, and third auxiliary coils 831 are formed. That is, each main coil 801 is a part of the main winding 80. Each of the first auxiliary coil 811, the second auxiliary coil 821, and the third auxiliary coil 831 is a part of the first auxiliary winding 81, the second auxiliary winding 82, and the third auxiliary winding 83.

  The first auxiliary coil 811, the second auxiliary coil 82, the third auxiliary coil 83 are respectively formed at the start or end of the first auxiliary coil 81, the second auxiliary coil 82, and the third auxiliary coil 83. It is pulled out from the coil 831.

  The winding direction of the main winding 80 and the three types of auxiliary windings refers to the winding direction when the tooth 61 is viewed from the central axis J1 side. In addition, the main winding 80 and the three types of auxiliary windings must be continuous. In the present invention, the term “continuous” means that each winding is not branched from one end to the other and is electrically conductive. It means being in a state. That is, even when a plurality of conducting wires are connected to form a single conducting wire, it is described as continuous as long as there is no branching and electrical conduction is possible.

  The main winding 80 and the three types of auxiliary windings are wound around every other tooth 61 so as to advance in the same direction in the circumferential direction. The connecting wire 224 between the teeth 61 of the main winding 80 is arranged on the upper side of FIG. 4, and the connecting wire 224 between the three types of auxiliary winding teeth 61 is arranged on the lower side of FIG. 4.

  The connecting wire 224 of the main winding 80 may be arranged on the lower side, and the connecting wires 224 of the three types of auxiliary windings may be arranged on the upper side, respectively. That is, the connecting wire 224 of the main winding 80 is disposed on one side of the upper side and the lower side of the core back 62, and the connecting wire 224 of the three types of auxiliary windings is the other of the upper side and the lower side of the core back 62, respectively. Placed on the side. As a result, the main winding 80 and the three types of auxiliary windings are prevented from interfering with each other at the connecting wire 224.

  The material of the winding is preferably aluminum. Aluminum is less expensive than copper, which is commonly used as a winding material. Note that copper may be used as the material of the winding.

Similar to a normal single-phase induction motor, the motor 1 includes a capacitor, and the phase of the alternating current flowing through the main winding 80 and the phase of the alternating current flowing through the three types of auxiliary windings are shifted by 90 ° due to the capacitor. As a result, a rotating magnetic field is generated inside the stator 22 and the rotating portion 3 rotates.

  As described above, by configuring the auxiliary winding from three types of windings, the speed of the single-phase induction motor can be changed finely and smoothly.

  FIG. 5 is a perspective view in which the insulator 222 is combined with the core element 60. The insulator 222 may be formed of a resin with an upper part and a lower part being separate members, and may be disposed on the stator core 221 by insert molding. The insulator 222 has a top plate portion 71 and a side wall portion 72. The top plate portion 71 includes a core back top plate portion 711, an umbrella top plate portion 712, and a main body top plate portion 713. The core back top plate portion 711 covers the upper surface and the lower surface of the core back element 621. The umbrella top plate part 712 covers the upper surface and the lower surface of the umbrella part 611. The main body top plate portion 713 covers the upper surface and the lower surface of the teeth 61 other than the umbrella portion 611. The side wall 72 covers the side wall of the core element 60 except for the outer peripheral surface and the inner peripheral surface of the core element 60.

  The insulator 222 is substantially symmetrical up and down. Since the shape of the upper part and the shape of the lower part of the insulator 222 are almost vertically symmetrical, the upper part will be described below.

  FIG. 6 is a perspective view in which the insulator 222 and the coil 223 are combined with the core element 60. Three pillars 73 are erected on the core back top plate portion 711 at both ends in the circumferential direction and at intervals therebetween. Each column 73 has an accommodation groove 731 extending in the circumferential direction on the upper end side and the lower end side on the side opposite to the coil 223 side. The axial positions of the accommodation grooves 731 on the upper end side of each column 73 and the accommodation grooves 731 on the lower end side of each column 73 are substantially equal. The conducting wire drawn out from the coil 223 passes between the pillars 73 adjacent to each other in the circumferential direction, extends outward in the radial direction, and enters the accommodation groove 731 on the upper end side of the pillar 73 or the accommodation groove 731 on the lower end side. Be contained. The conducting wire accommodated in the accommodating groove 731 extends in the circumferential direction along the accommodating groove 731 and continues to another coil 223.

  Note that the receiving grooves 731 of the pillars 73 at both ends in the circumferential direction and the receiving grooves 731 of the pillars in the middle in the circumferential direction have different depths in the radial direction of the grooves. Specifically, the receiving grooves 731 of the pillars 73 at both ends in the circumferential direction are shallower in the radial direction of the grooves than the receiving grooves 731 of the pillars 73 in the circumferential direction. The reason will be described below. When the connecting wire 224 is passed between the core back elements 621 adjacent in the circumferential direction, the connecting wire 224 is disposed in the vicinity of the connecting portion 622 of the core back 62. This is because the connecting wire 224 is prevented from loosening radially outward when the connected core back elements 621 are annular. In order to hold the connecting wire 224 in the vicinity of the connecting portion 622, the accommodation grooves 731 of the pillars 73 at both ends in the circumferential direction are shallower in the radial direction than the accommodation grooves 731 of the pillars in the middle in the circumferential direction.

  Among all the core back top plate portions 711 in FIG. 3, four core back top plate portions 711 that are arranged adjacent to each other in the circumferential direction are used for standing the binding pins 84 on the upper surfaces of the three pillars 73. One hole 732 is provided. The binding pin 84 is erected in the hole 732 upward and substantially perpendicular to the horizontal plane. One entanglement pin 84 is entangled with the start end or the end of any one of the main winding 80 or the three types of auxiliary windings.

  In FIG. 3, in the core back top plate portion 711 having the hole 732, the core back top plate portion 711 in which only one binding pin 84 stands and the core back top plate portion 711 in which three binding pins 84 stand. There is. In the core back top plate portion 711 having only one binding pin 84, the start end or the end of the main winding 80 is bound to the binding pin 84. In the core back top plate portion 711 with three binding pins, each of the three binding pins 84 is connected to the start or end of three types of auxiliary windings.

  The start or end of the three types of auxiliary windings are drawn from a first auxiliary coil 811, a second auxiliary coil 821, and a third auxiliary coil 831 formed on the same tooth 61, respectively. The lengths at which the start or end of the three types of auxiliary windings are drawn out are short, and on the core back top plate 711 connected to the main body top plate portion 713 on which the coil 223 is formed, It is tied. Therefore, since the start end or the end of the three kinds of auxiliary windings is short, the possibility that the lead wire is caught by other parts and damaged is low.

  As shown in FIG. 6, the three pillars 73 each have a hole 734 in the upper surface. The lightening hole 734 is in the central region on the outer side in the radial direction of the column 73 and is in the vicinity of the hole 732 for raising the binding pin 84. The lightening holes 734 can prevent the resin from sinking and forming a dent on the upper surface of the pillar 73 when the resin hardens during the manufacturing process of the pillar 73. Therefore, it is possible to prevent a situation in which the binding pin 84 cannot be stably stood due to the depression on the upper surface of the column 73.

  Each of the three columns 73 has a flange 733 that extends horizontally from the upper surface of the column 73 in the circumferential direction. The flange 733 in the circumferential intermediate column 73 spreads from the upper surface at both ends in the circumferential direction to both sides in the circumferential direction. Further, each of the pillars 73 at both ends in the circumferential direction has one flange 733. Each of the flanges 733 spreads from the upper surface of the pillars 73 at both ends in the circumferential direction so as to face and approach the flanges 733 of the intermediate column 73 in the circumferential direction.

  Further, the flange 733 of each column is located above the lead wire outlet of the coil 223 and below the binding portion 841 of the lead pin 84 of the conductive wire. Therefore, the conducting wire drawn out from the coil 223 can be hooked on the hook before being tied to the binding pin. Therefore, the conductor can be positioned during the winding operation, and the problem that the winding is caught by other parts and the efficiency of the operation is reduced due to the slack of the conducting wire is less likely to occur. Also in the product, it is possible to prevent the lead wires from slacking up and being damaged by the ribs 912 of the wiring board 91 described later.

  Further, the flange 733 is positioned on the coil 223 side from the radial center of the core back 62. Therefore, the conducting wire drawn out from the coil 223 is more difficult to loosen.

  Conventionally, the positioning of the conducting wire drawn from the coil 223 during the winding operation has been performed by a winding machine. However, in the conventional method, since a mechanism for suppressing the slack of the winding must be incorporated in the winding machine, the equipment cost is increased. In that respect, in the example of the embodiment of the present invention, since the insulator plays the role of the conventional winding machine, the equipment cost of the winding machine can be suppressed.

  A fixing pin 85 is erected on the radially outer side of the upper surface of the column 73. The fixing pin 85 is a pin for fixing a wiring board 91 to be described later to the insulator 222. In addition, there is a concave portion on the outer surface in the radial direction on the upper surface of the pillar 73, and there is a convex portion on the back surface of the wiring board 91 where the concave portion and the circumferential direction and the radial position coincide with each other. Also good.

  FIG. 7 is a view of a structure in which the insulator 222 and the coil 223 are combined with the core element 60 as viewed from the rotating unit 3 side. The umbrella top plate portion 712 of the insulator 222 extends to both sides in the circumferential direction. That is, the circumferential width of the umbrella top plate portion 712 is larger than the circumferential width of the main body top plate portion 713. The umbrella top plate portion 712 has a wall portion 74 that extends upward from the top surface of the umbrella top plate portion 712. The wall portion 74 has a rotating portion facing surface 741 that faces the rotating portion 3. The distance from the side circumferential surface of the rotating unit 3 at both circumferential ends of the rotating unit facing surface 741 is larger than the distance from the side circumferential surface of the rotating unit 3 at the circumferential center of the rotating unit facing surface 741. That is, both ends in the circumferential direction of the wall portion 74 are inclined outward in the radial direction over the axial direction.

  Further, the wall 74 is notched at the upper ends of the wall 74 in the circumferential direction so that the axial height of the wall 74 gradually decreases along the circumferential both ends from the center. In addition, at the center in the circumferential direction of the wall portion 74 of the insulator 222, there is a recess 742 that extends downward from the upper end of the wall portion 74 in the axial direction.

  FIG. 7 is a diagram in which a wiring board 91 is arranged on the stator 22. The wiring board 91 is provided with a lead wire 92 that connects the end of the winding drawn from the coil 223 and the ECU outside the motor. The lower surface of the wiring board 91 hits the wall 74 of the insulator 222 and the upper surface of the pillar 73, and the position of the wiring board 91 in the axial direction is determined.

  Further, on the outer side in the radial direction of the wiring board 91, there is a fixing hole 93 at a position where the circumferential direction and the radial position coincide with the pillar 73 of the insulator 222. The fixing pin 85 of the insulator 222 fixes the wiring board 91 to the insulator 222 by being press-fitted into the fixing hole 93 or by heat welding after insertion.

  There are a plurality of notches 911 on the rotating part 3 side of the wiring board 91. At least one of the plurality of cutouts 911 has a circumferential position that coincides with a slot between adjacent teeth 61 in the circumferential direction.

  The periphery of the coil 223 is covered with resin. The resin has a role of transferring heat generated from the coil 223 to the outside of the motor when a current is passed through the winding. The coil 223 disposed under the wiring board 91 is also covered with resin. The resin is caused to flow between the wiring board 91 and the coil 223 from the radially outer side or the circumferential outer side.

  The resin flowed between the wiring board 91 and the coil 223 passes through a space formed between the wall portions 74 of the insulator 222 attached to the teeth 61 adjacent in the circumferential direction and the notch 911 of the wiring board. , And flows inward in the radial direction of the wall portion 74 of the insulator 222. However, if the thickness of the resin flowing in the radial direction of the wall portion 74 is small, the resin may peel off to the rotating portion 3 side. Therefore, in the exemplary embodiment of the present invention, first, the circumferential ends of the wall portion 74 of the insulator 222 are inclined radially outward so that the resin can easily flow from the radially outer side to the inner side of the insulator 222. . Further, the upper notch at both ends in the circumferential direction of the wall 74 and the notch 911 of the wiring board 91 can hold a wide space through which the resin passes, and the resin easily flows inward in the radial direction of the insulator 222. As described above, since the resin between the wiring board 91 and the coil 223 tends to flow inward in the radial direction of the insulator 222, it is possible to suppress the thickness of the resin inside the wall portion 74 of the insulator 222 from being reduced.

  FIG. 9 is a view of the wiring board 91 as seen from the back side. A plurality of ribs 912 are disposed on the back side of the wiring board 91, that is, on the side facing the stator 22 in the axial direction. Each of the plurality of ribs 912 protrudes toward the stator 22 from the back surface of the wiring board 91. Therefore, when the conducting wire disposed on the core back top plate portion 711 of the insulator 222 is slacked upward, there is a risk of damage by the rib 912. However, it is possible to suppress the wire drawn from the coil 223 from being loosened to the upper side of the binding portion by the flange 733 on the pillar 73 of the core back top plate portion 711. Therefore, damage to the conducting wire due to the rib 912 of the wiring board 91 can be prevented.

As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment.

  For example, in the above embodiment, the stator core 221 may not be a developed core, but may be a split core or an annular core. Also. Further, the number of core elements 60 may be twelve or more. In the case of a single-phase induction motor, in principle, the number of core elements 60 is a multiple of four. When the number of core elements 60 is 8 or 12, the use efficiency of the steel sheet is particularly improved by making the outer peripheral surface of the core elements 60 substantially flat.

  Three or more auxiliary windings may be used. The more the types of auxiliary windings, the more smoothly the speed of the motor 1 can be switched. The number of turns per tooth for each of the different types of auxiliary windings may be the same. Further, the second auxiliary winding and the third auxiliary winding may be wound on the main coil.

The bearing portion 4 is not limited to the ball bearings 41 and 42. For example, a sleeve-shaped bearing portion may be used.

The configurations in the above embodiment and each modification may be combined as appropriate as long as they do not contradict each other.

  The present invention can be used as a motor for various applications, and is particularly suitable for a motor for a fan, an air conditioner, an air cleaner, a range hood, a water heater, a humidifier, or a blower.

2 Static part 3 Rotating part 4 Bearing part 22 Stator 23 Resin mold 60 Core element 61 Tees 62 Core back 71 Top plate part 72 Side wall part 73 Column 74 Wall part 80 Main winding 81 First auxiliary winding 82 Second auxiliary winding 83 Third auxiliary winding 84 Binding pin 85 Fixing pin 91 Wiring board 92 Lead wire 93 Fixing hole 221 Stator core 222 Insulator 223 Coil 224 Crossover 621 Core back element 622 Connecting portion 711 Core back top plate portion 712 Umbrella top plate portion 713 Main body top plate portion 731 Receiving groove 732 Hole 733 ３４ 734 Mouth hole 741 Rotating portion facing surface 742 Recessed portion 811 Main coil 821 Auxiliary coil 911 Notch 912 Rib

Claims (16)

A rotating part;
A stationary part having a stator;
A bearing portion that rotatably supports the rotating portion with respect to the stationary portion about a central axis;
With
The stator is
An annular core back centering on a vertically extending central axis, and a stator core comprising a plurality of teeth extending radially inward from the core back;
An insulator covering the stator core;
A plurality of coils composed of conductive wires wound around the plurality of teeth via the insulator ;
With
The plurality of coils are
A plurality of main coils formed by main windings wound around every other tooth while reversing the winding direction;
A plurality of first auxiliary coils formed by first auxiliary windings in which continuous conductors are wound around the teeth positioned between the other teeth while reversing the winding direction;
Including
At least one of the plurality of main coils or the plurality of first auxiliary coils is overlaid with a plurality of auxiliary windings ,
Among the plurality of teeth, the start end or end of the main winding, or the teeth from which the start end or end of the first auxiliary winding is drawn, and the start ends of the plurality of auxiliary windings that are overlapped or The teeth from which the end is pulled out are the same teeth,
A plurality of binding pins extending in one axial direction are arranged on one end surface in the axial direction of the insulator in the vicinity of the same teeth,
A starting end or termination of the main winding, or a starting end or termination of the first auxiliary winding, and a starting end or termination of the auxiliary winding are each entangled one by one with the plurality of binding pins. Phase induction motor.   2. The single-phase induction motor according to claim 1, wherein the first auxiliary winding and the plurality of lap-wound auxiliary windings each have a different number of turns per tooth.   3. The single-phase induction motor according to claim 1, wherein each of the first auxiliary winding and the plurality of auxiliary windings wound in lap is the same in winding direction.   4. The single-phase induction motor according to claim 1, wherein the plurality of auxiliary windings are wound only on the plurality of first auxiliary coils. The stator core is a set of a plurality of core elements;
Each of the plurality of core elements includes one tooth and a core back element that is a corresponding part of the core back.
Wherein the plurality of core back elements are each covered with the insulator made of resin,
5. The single-phase induction motor according to claim 1, wherein each of the binding pins is erected so as to extend in one axial direction on one end surface in the axial direction of the insulator that covers the same core back element. .   6. The single-phase induction motor according to claim 1, wherein materials of the main winding, the first auxiliary winding, and the plurality of auxiliary windings that are overlapped are aluminum. The insulator has a core back top plate portion covering an axial end surface of the core back,
In the core back top plate portion, the conducting wire drawn from the coil is disposed,
The core back top plate has a column extending in one axial direction,
The single-phase induction motor according to any one of claims 1 to 6, wherein the column has a flange that covers at least a part of the conducting wire from one axial direction . The single-phase induction motor according to claim 7, wherein the flange is positioned closer to the coil side than the radial center of the core back . The wire drawn out from the coil has a tying portion to be tied to the entwining pin erected on said post, said eaves, the a one axial side of the conductor draw-out opening, the fault The single-phase induction motor according to claim 6, which is located on the other side in the axial direction from the flange . The single-phase induction motor according to any one of claims 6 to 9, wherein the pillar has a hollow hole on an upper surface . The side of the column opposite to the coil side is located on the side opposite to the coil from the radial center of the core back,
The side surface has a receiving groove extending along the circumferential direction,
The single-phase induction motor according to any one of claims 6 to 10, wherein a part of the conducting wire is housed in the housing groove . There are three pillars in the circumferential direction of the core back top plate part, and there are three spaces between them, and the receiving grooves of the pillars at both ends in the circumferential direction have a greater depth in the radial direction than the receiving grooves of the intermediate intermediate pillars. The single phase induction motor according to claim 11, which is shallow . A wiring board is disposed at a position facing the top plate portion in the axial direction through a gap,
The single-phase induction motor according to any one of claims 6 to 12, wherein a rib is provided on a surface of the wiring board facing the top plate portion . Before SL plurality of teeth, the rotating side, each have a bevel portion extending in the circumferential direction both,
The insulator has a wall portion that extends in one direction from one axial end portion of the umbrella portion,
The wall portion has a rotating portion facing surface facing the rotating portion,
The distance from the side circumferential surface of the rotating part at both ends in the circumferential direction of the rotating part facing surface is larger than the distance from the side circumferential surface of the rotating part at the circumferential center of the rotating part facing surface,
The single-phase induction motor according to any one of claims 1 to 12, wherein both end surfaces in the axial direction of the stator and surfaces facing the rotating portion of the insulator are molded with a resin molding material. A wiring board is disposed on one side of the stator in the axial direction,
On the rotating part side in the radial direction of the wiring board, there are a plurality of notches,
The single-phase induction motor according to claim 14, wherein at least one of the plurality of notches coincides in a circumferential position with a slot between adjacent teeth in the circumferential direction. 16. The single-phase induction motor according to claim 14, wherein a concave portion extending from one axial end of the wall portion to the other axial end is provided at a circumferential center of the wall portion of the insulator.

Images