JP2016039732A - Coil mounting method for rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coil mounting method for a rotary electric machine by which efficiency is improved.SOLUTION: In a coil element 33, first and second protrusions 331 and 332 are formed which protrude from both end faces of a stator 17. By shaping the coil element 33, the first protrusion 331 collapses toward a side of the stator 17, and an inner diameter side portion α of the first protrusion 331 is moved from a position of a distal end of teeth to a position at an outer diameter side and formed so as not to protrude from the position of the distal end to a center side of the stator 17. The second protrusion 332 collapses toward the side of the stator 17, and an inner diameter surface projects a distal end of teeth to an inner diameter side that is closer to the center side of the stator 17.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method of mounting a magnetic field forming coil on a rotating electrical machine such as a motor.

Usually, a plurality of teeth are arranged in parallel on the inner peripheral side of the stator of the rotating electrical machine, and a magnetic field forming coil is wound around these teeth.
In the techniques disclosed in Patent Document 1 and Patent Document 2, the end of the coil protruding from one end face of the stator is shaped so as to extend toward the center side of the stator.

JP 2007-325472 A (refer to FIG. 1) JP 2010-200596 A (see FIG. 1)

  If it comprises like patent document 1 and patent document 2, since the end of the said coil is extended in the center side of the stator, it is possible to make the height in the stator axial direction of a coil end low. However, in this case, the entire length of the conducting wire becomes longer and the loss due to electric resistance increases.

  An object of the present invention is to provide a technical idea effective for improving the efficiency of a rotating electrical machine.

  In order to achieve the above object, according to the present invention, in a method of attaching a coil to a stator of a rotating electrical machine in which a plurality of teeth are arranged on the inner diameter side, an annular coil element is wound around the teeth of the stator, and the coil After the protrusion protruding from the stator end face of the element is positioned on the inner diameter side of the tip end position of the tooth, the protrusion is shaped, and the protrusion on one end face side of the stator is positioned outside the stator from the tip end position of the tooth. In addition to being positioned on the radial side, the protruding portion on the other end face side is positioned closer to the inner diameter side than the tip position of the tooth.

  If it does in this way, it can avoid that conducting wire full length becomes long, and can reduce loss by electric resistance. Further, since the coil element passes through the position of the almost string of the stator, the coil element can be made smaller, and the thickness of the stator can be increased correspondingly, thereby increasing the torque. And after shaping, since the amount of oil entering the gap between the stator and the rotor can be reduced by the protrusion located on the inner diameter side from the tip of the tooth, the drag loss during the rotation of the motor can be reduced. From these things, the efficiency of a motor can be improved.

  According to the present invention, there is an effect that the efficiency of the motor can be improved.

Sectional drawing of a motor. The perspective view of a stator. The side view of a stator. The front view of a coil element. Sectional drawing which shows the mounting state of the coil element with respect to a stator. Sectional drawing which shows the mounting state of the coil element seen from the direction different from FIG. Sectional drawing which shows the shaping state of a coil element. Sectional drawing which shows the assembly | attachment process of a motor. The side view which shows a modification.

(Embodiment)
Hereinafter, embodiments will be described. This embodiment is embodied in a three-phase AC motor as a rotating electrical machine.

  As shown in FIG. 1, the housing 12 of the motor 11 includes a case 13 and an end plate 14. The case 13 includes a side wall 15 and a peripheral wall 16. An annular stator 17 is fixed to the inner surface of the peripheral wall 16 of the case 13. Bearings 18 are attached to the central portions of the side wall 15 and the end plate 14 of the case 13, and a motor shaft 20 at the center of the rotor 19 is rotatably supported between the bearings 18. The stator 17 is provided with a coil 21. The rotor 19 is provided with a permanent magnet (not shown). When a three-phase alternating current flows through the coil 21, a magnetic field repelling the magnetic force of the permanent magnet is formed, and the rotor 19 is rotated. Instead of the permanent magnet, a coil may be provided in the rotor 19 so that a current flows through the coil.

  First and second protrusions 331 and 332 described later of the coil 21 are disposed at both ends of the stator 17. Refueling ports 22 and 23 are formed in the peripheral wall 16 and the side wall 15 of the case 13 so as to correspond to the first and second projecting portions 331 and 332, respectively. The high temperature portion inside the motor 11 is cooled by the circulating flow of oil supplied into the housing 12 from the oil supply ports 22 and 23, and the bearing 18 is lubricated.

  As shown in FIGS. 2 and 3, the stator 17 is configured by laminating a plurality of magnetic steel plates 31. The stator 17 extends toward the center of the stator 17 on the inner diameter side of the ring portion 171, and is equally spaced. And a plurality of teeth 172 arranged side by side. The tip of each tooth 172 is located on one circle centered on the center of the stator 17. A gap 32 is formed between the teeth 172. As shown by a two-dot chain line in FIG. 3, coil elements 33 in which U-phase, V-phase, and W-phase currents flow are inserted between gaps 32 sandwiching a predetermined number (for example, six) of teeth 172, and a predetermined number It is wound around the teeth 172 group. As shown in FIG. 4, the coil element 33 is configured by winding a single conducting wire 34 in an annular shape.

Next, the mounting method of the coil 21 configured as described above and the mounting method of the motor 11 will be described.
The coil 21 is attached to the stator 17 as follows. That is, as shown by a two-dot chain line in FIG. 3 and as shown in FIGS. 4 to 6, the coil element 33 in which the conductive wire 34 is wound annularly is inserted between the gaps 32 with a predetermined number of teeth 172 interposed therebetween. In this way, the coil element 33 is formed with first and second projecting portions 331 and 332 projecting from both ends of the stator 17. As apparent from FIGS. 3 and 6, the portion on the stator inner diameter side of the coil element 33 including both the projecting portions 331 and 332 is located on the stator inner diameter side from the tip of the tooth 172. Therefore, the portion of the coil element 33 on the stator inner diameter side passes through the position of a substantially chord of a circle passing through the tip of the tooth 172.

  Next, the portion of the gap 32 of the coil element 33 is pushed toward the outer diameter side from the tip of the tooth 172 and is placed in the gap 32. Then, as shown in FIG. 7, the first projecting portion 331 is shaped using two jigs 41 and 44 on the inner diameter side of the stator 17 and two jigs 42 and 43 on the outer diameter side. By this shaping, the first projecting portion 331 is crushed toward the end face side of the stator 17 and the inner diameter side portion α of the first projecting portion 331 is moved from the position of the tip of the tooth 172 to the outer diameter side. , So as not to protrude from the tip position toward the center of the stator 17.

  Before and after this, the second protrusion 332 is shaped using the two jigs 45 and 49 on the inner diameter side of the stator 17 and the two jigs 46 and 47 on the outer diameter side. By this shaping, the second projecting portion 332 is crushed toward the end surface side of the stator 17, and the inner diameter surface projects from the tip of the teeth 172 to the inner diameter side that is the center side of the stator 17. Thus, since the 2nd protrusion part 332 protrudes in the inner diameter side from the front-end | tip position of the teeth 172, the height (beta) of the 2nd protrusion part 332 may be made lower than the height (gamma) of the 1st protrusion part 331 correspondingly. it can. Thereafter, the first and second projecting portions 331 and 332 are raced by yarns (not shown), and varnish (not shown) is applied to the projecting portions 331 and 332. For this reason, the protrusions 331 and 332 are fixed in the state shown in FIG.

  As shown in FIG. 8, the set of the stator 17 and the coil 21 thus configured has a case in which the first protrusion 331 is positioned on the opening side of the case 13 and the second protrusion 332 is positioned on the back side. 13 is assembled.

  Next, the rotor 19 assembled with the motor shaft 20 is inserted into the space at the center of the stator 17 from the first protrusion 331 side, and one end of the motor shaft 20 is supported by the bearing 18 on the case 13 side. Thereafter, the end plate 14 is assembled so as to cover the opening of the case 13, and the other end of the motor shaft 20 is supported by the bearing 18.

In this way, the motor 11 is assembled. In this assembled state, since the height β of the second protrusion 332 is low, the axial dimension of the motor shaft 20 of the housing 12 can be shortened.
Further, when the motor 11 is in operation, oil is supplied from the oil supply ports 22 and 23. At this time, since the second projecting portion 332 is positioned on the inner diameter side beyond the tip of the tooth 172, the oil from the oil supply port 23 on the second projecting portion 332 side is supplied to the stator 17 by the second projecting portion 332. It is possible to suppress entry into the gap between the rotor 19 and the rotor 19. For this reason, the amount of oil in the gap is reduced, and drag loss during motor rotation can be reduced. Moreover, since oil stays on the 2nd protrusion part 332 long in a radial direction for a long time, an effective cooling effect | action can be acquired.

Therefore, this embodiment has the following effects.
(1) The coil element 33 is attached to the stator 17 so as to protrude from the tip of the teeth 172 of the stator 17 toward the inner diameter side. In other words, it is not necessary to prevent the coil element 33 from projecting to the inner diameter side from the tip of the teeth 172 of the stator 17. For this reason, the winding thickness ε shown in FIG. 6 of the coil element 33 can be increased. Accordingly, the number of turns of the coil element 33 can be increased to increase the coil space factor, and the efficiency of the motor 11 can be improved.

  (2) Since the coil element 33 can be mounted so as to pass through the inner diameter side of the tip of the tooth 172, so to speak, it can be mounted in a shortcut manner along the circumference of the stator 17, so that the winding diameter δ of the coil element 33 shown in FIG. Can be reduced. For this reason, even if the winding number of the conducting wire 34 is increased, it is possible to avoid an increase in the total length of the conducting wire 34. Therefore, the efficiency of the motor 11 can be improved by reducing the loss due to the electric resistance.

  (3) Since the amount of oil entering the gap between the stator 17 and the rotor 19 can be reduced by the second protrusion 332, the drag loss during the rotation of the motor 11 can be reduced, and the efficiency of the motor can be improved.

  (4) Since the second projecting portion 332 of the coil element 33 extends to the center side of the stator 17, the surface area can be increased. For this reason, cooling with oil can be performed effectively, and it can contribute to the improvement of the efficiency of the motor and also to the prevention of overheating.

(5) Since the protrusion amount of the second protrusion 332 from the side surface of the stator 17 can be reduced, the motor 11 can be reduced in size.
(Example of change)
The present invention is not limited to the embodiment described above, and can be embodied as follows.

  As shown in FIG. 9, the coil elements 33 of each phase are sequentially shifted in the circumferential direction of the stator 17 by one or more teeth 172, and a plurality of coil elements having different phases are arranged on one tooth 172. 33 should be placed one on top of the other. Even with this configuration, a part of the element 33 protrudes from the tooth 172 toward the inner diameter side.

-Configure the three-phase coil element 33 as one coil element. That is, the coil element 33 is constituted by three conducting wires.
To embody the present invention in a single phase motor.

  • embodied the invention in a generator.

  DESCRIPTION OF SYMBOLS 11 ... Motor, 17 ... Stator, 21 ... Coil, 172 ... Teeth, 33 ... Coil element, 331 ... Projection, 332 ... Projection

Claims (1)

In the method of attaching the coil to the stator of the rotating electrical machine in which a plurality of teeth are arranged side by side on the inner diameter side,
An annular coil element is wound around the teeth of the stator, and the protruding portion that protrudes from the end surface of the stator of the coil element is positioned on the inner diameter side from the tip end position of the teeth, and then the protruding portion is shaped, A method of attaching a coil to a stator of a rotating electrical machine, wherein one end face side protrusion is positioned on the outer diameter side from the tip end position of the tooth, and the other end face side protrusion is positioned on the inner diameter side from the tip end position of the tooth.