JP2015186315A - Stator of rotary electric machine and rotary electric machine including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator of a rotary electric machine capable of reducing leakage magnetic flux across a slot and improving an output during high-speed rotation.SOLUTION: A stator 100 has a plurality of slots 12 each for storing a stator conductive member 14 and a stator tooth 10a sandwiched between mutually neighboring slots 12. Each of the stator tooth 10a has a plurality of slits 16 provided along a radial direction from a gap with a rotor.

Description

  The present invention relates to a stator for a rotating electrical machine and a rotating electrical machine including the stator.

  Disclosed is a stator for a rotating electrical machine, in which a slot into which a stator coil is inserted is provided on the inner peripheral side, and a slit extending in a radial direction from an end surface on the inner peripheral side is provided between adjacent slots. ing. Here, the eddy current loss of the stator teeth is reduced by making the length of the arc of the stator teeth divided by the slits non-uniform (Patent Document 1).

JP 2011-97737 A

  By the way, in the technique of patent document 1, although the slit is provided in the stator and it is effective in reduction of the eddy current loss in a stator tooth, the effect which suppresses the leakage magnetic flux to the circumferential direction of a stator is effective. The output of the rotating electrical machine is not realized at a high speed at a small speed.

  One aspect of the present invention is a stator having a plurality of slots for storing a stator conductive material and stator teeth sandwiched between the slots adjacent to each other, and each of the stator teeth includes: A stator of a rotating electrical machine having a plurality of slits provided along a radial direction from a gap with a rotor.

  Another aspect of the present invention is a rotating electric machine comprising the stator of the rotating electric machine and a rotor arranged with respect to the stator through the gap.

  Here, it is preferable that the slit is provided to a depth of 80% or more of the slot.

  In addition, it is preferable that two or more slits are provided in each of the stator teeth.

  ADVANTAGE OF THE INVENTION According to this invention, the leakage magnetic flux over a slot can be reduced in the stator of a rotary electric machine, and an output can be improved at the time of high speed rotation.

It is a figure which shows the structure of the stator of the rotary electric machine in embodiment of this invention. It is an enlarged view which shows the structure of the stator of the rotary electric machine in embodiment of this invention. It is a figure for demonstrating the leakage magnetic flux in the stator of the conventional rotary electric machine. It is a figure for demonstrating the leakage magnetic flux in the stator of the rotary electric machine in embodiment of this invention. It is a figure which shows another structure of the stator of the rotary electric machine in embodiment of this invention.

  FIG. 1 is a cross-sectional view orthogonal to the rotational axis direction of a stator 100 of a rotating electrical machine according to an embodiment of the present invention. The stator 100 is disposed so as to face the hollow cylindrical rotor through a predetermined gap (gap), and generates a magnetic field by the electric power supplied from the outside to rotate the rotor. Stator 100 in the embodiment of the present invention can be applied to a rotating electrical machine or the like.

  The stator 100 includes a stator core 10 that is formed into a cylindrical shape by stacking a plurality of substantially circular stator core plates obtained by press punching electromagnetic steel sheets. Here, the stator core plate preferably has a thickness of 0.1 mm to 0.5 mm, for example.

  In addition, slots 12 for storing the stator conductive material 14 at equal intervals in the inner circumferential direction of the stator 100 are formed at the inner edge of the stator core 10. That is, the plurality of slots 12 are provided at equal intervals along the inner circumferential direction of the stator core 10 at a predetermined pitch angle α.

  For example, the stator conductive material 14 can be stored in the slot 12 by providing an opening on the inner edge side of the stator core 10 of the slot 12 and inserting a metal conductor from the opening. For example, a conductive coil is wound around the slot 12 to form the stator conductive material 14.

  Further, the stator 100 in the present embodiment is provided with a plurality of slits 16 between adjacent slots 12. FIG. 2 is an enlarged view of the slot 12. As shown in FIG. 2, a plurality of stator teeth 10 a, which are portions of the stator core 10 sandwiched between adjacent slots 12, are arranged in the radial direction from the gap with the rotor 200 toward the outer periphery of the stator core. The slit 16 is formed.

  In the example of FIGS. 1 and 2, two slits 16 are provided on both sides of each slot 12. That is, a total of four slits 16 are provided in the stator teeth 10 a sandwiched between adjacent slots 12. The number of the slits 16 provided in the stator teeth 10a sandwiched between the adjacent slots 12 is not limited to this, and may be two or more. However, if the number of slits 16 is increased, the maximum output torque is reduced during the low-speed rotation of the rotating electric machine. Is preferred.

  When the stator teeth 10a are not provided with slits, as shown by arrows in FIG. 3, leakage of magnetic flux from the stator teeth 10a to the slots 12 increases at the inner peripheral portion of the stator 100 where the slots 12 are provided. As a result, high output cannot be achieved during high-speed rotation of the rotating electrical machine. On the other hand, by providing a plurality of slits 16 in the stator teeth 10a sandwiched between adjacent slots 12 as in the present embodiment, the slots 12 of the stator 100 are indicated by arrows in FIG. The magnetic resistance along the circumferential direction is increased in the inner peripheral portion provided with, so that leakage magnetic flux from the stator teeth 10a to the slots 12 can be reduced. Thereby, high output can be realized at the time of high-speed rotation of the rotating electrical machine.

  Here, if the width along the circumferential direction of the slit 16 is increased, the effect of reducing the leakage magnetic flux in the slot 12 is enhanced. However, if the width is increased too much, the output torque at the time of low-speed rotation is reduced. .2 mm or less is preferable.

  The length of the slit 16 along the radial direction is preferably 80% or more of the length L of the slot 12 in the radial direction. As a result, the effect of reducing the leakage magnetic flux across the slot 12 becomes significant.

  As shown in FIG. 5, the stator 100 is formed in a cylindrical shape, and a rotor 200 is disposed outside the stator 100 via a gap (gap) so that the rotor 200 rotates around the stator 100. It is good also as a structure. Even in such a configuration, the same effect can be obtained by providing a plurality of slits 16 in the stator teeth 10a sandwiched between adjacent slots 12.

  10 Stator Core, 10a Stator Teeth, 12 Slots, 14 Stator Conductive Material, 16 Slit, 100 Stator, 200 Rotor.

Claims (4)

  A stator having a plurality of slots for storing a stator conductive material and stator teeth sandwiched between the slots adjacent to each other, each of the stator teeth being in a radial direction from a gap with the rotor A stator for a rotating electrical machine, comprising a plurality of slits provided along the stator. A stator for a rotating electrical machine according to claim 1,
The stator of a rotating electrical machine, wherein the slit is provided to a depth of 80% or more of the slot. A stator for a rotating electrical machine according to claim 1 or 2,
2 or more and 6 or less slits are provided in each of the stator teeth. A stator for a rotating electrical machine according to any one of claims 1 to 3,
A rotor disposed via the gap with respect to the stator;
A rotating electric machine comprising:

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