JP5710678B2 - Motor stator - Google Patents

Description

  The present invention includes a plurality of magnetic poles projecting radially inward from an inner peripheral surface of a cylindrical stator core, and windings of respective phases constituting a multiphase winding face each other across the center of the stator core. The winding wire between the pair of magnetic poles is supported by an insulator covering the axial end surface of the stator core and is wired in the circumferential direction. The present invention relates to a motor stator.

A related motor stator is formed in Patent Document 1.
As shown in FIG. 6A, the stator of the motor includes a cylindrical stator core 101, and six magnetic poles P1 to P6 are radially inward from the inner peripheral surface of the stator core 101. Is formed to protrude. Three-phase windings are wound around the six poles P1 to P6.
For example, as shown in FIGS. 6A and 6B, the U-phase winding 105 is wound along the insulator 110 that covers the axial end surface of the stator core 101 after being wound around the magnetic pole P1. It is wired clockwise, crosses over the magnetic pole P4 (crossover wire 105w), and is wound around the magnetic pole P4. Similarly, the V-phase winding 106 is wound around the magnetic pole P2, is then routed clockwise along the insulator 110, crosses over the magnetic pole P5 (crossover wire 106w), and is wound around the magnetic pole P5. The W-phase winding 107 is wound around the magnetic pole P3, is then routed clockwise along the insulator 110, crosses over the magnetic pole P6 (crossover wire 107w), and is wound around the magnetic pole P6.

JP 7-46782 A

  However, in the stator described above, the connecting wires 105w, 106w, and 107w of the windings 105, 106, and 107 of each phase are wound in the same direction (clockwise) along the insulator 110, so that FIG. As shown in B), a portion T where the crossover lines 105w, 106w, 107w overlap in the axial direction is generated. When the connecting wires 105w, 106w, 107w are three-layered in the axial direction, it is necessary to form the rib 109 etc. on which the connecting wires 105w, 106w, 107w are hung to a height corresponding thereto, so the axial length of the stator The size increases.

  The present invention has been made to solve the above-described problems, and the problem to be solved by the present invention is to prevent the axial length of the stator from becoming large.

The above-described problems are solved by the inventions of the claims.
The invention of claim 1 is formed in a cylindrical shape by laminating plates, and the first magnetic pole, the second magnetic pole, the third magnetic pole, the fourth magnetic pole, the fifth magnetic pole and the sixth magnetic pole are formed on the inner peripheral surface. A stator core formed in a state in which the magnetic poles of the first and second magnetic poles are arranged in the circumferential direction, a first winding wound around the first magnetic pole and the fourth magnetic pole and having a first jumper, and the first A second winding wound around the second and fifth magnetic poles and having a second jumper; and a second winding wound around the third and sixth magnetic poles and having a third jumper 3 and an insulator having a plurality of protrusions positioned in the axial direction of the stator core and protruding in the axial direction. The protrusions of the insulator include the first crossover and the second crossover. An electric tool using a crossover wire and a stator configured to be hooked by the third crossover wire, wherein the first crossover is between the first magnetic pole and the second magnetic pole. And the second crossover line are overlapped in the axial direction, only the first crossover line is disposed between the second magnetic pole and the third magnetic pole, and the first crossover is made between the third magnetic pole and the fourth magnetic pole. And the third crossover line is overlapped in the axial direction, only the third crossover line is disposed between the fourth magnetic pole and the fifth magnetic pole, and the third crossover line is formed between the fifth magnetic pole and the sixth magnetic pole. The connecting wire and the second connecting wire overlap each other in the axial direction, and only the second connecting wire is arranged between the sixth magnetic pole and the first magnetic pole, and is hung on the protrusion of the insulator to be the shaft of the stator core. Of the connecting wires that are stacked in two stages in the direction, the side surface on the outer side in the axial direction of the connecting wire located on the outer side in the axial direction is exposed entirely from the insulator in the circumferential direction of the stator core. And

According to the present invention, the number of overlaps of the first connecting wire in the first winding, the second connecting wire in the second winding, and the third connecting wire in the third winding is two stages. the projecting dimension of the axial projections thereof connecting wire is multiplied (ribs, etc.) can be reduced, the axial length of the stator is reduced.

According to the second aspect of the present invention, the first winding, the second winding, and the third winding have Y ends respectively wound around three magnetic poles adjacent in the circumferential direction of the stator core. It is connected in a letter shape.
According to the invention of claim 3, after the first winding is wound around the fourth magnetic pole, the second winding is wound around the fifth magnetic pole, and then the third winding is wound. These windings are connected to each other after being wound around the sixth magnetic pole.

According to the invention of claim 4, the second crossover line straddles the first magnetic pole and the sixth magnetic pole,
The third crossover line straddles the third magnetic pole, the fourth magnetic pole, the fifth magnetic pole and the sixth magnetic pole, and the insulator includes the second crossover line and the third crossover line. A first projection formed at a position shifted in the circumferential direction with respect to the fifth magnetic pole, the second jumper wire and the third jumper wire, and the first jumper. And a second protrusion formed at the same position in the circumferential direction with respect to the six magnetic poles, and the first protrusion and the second protrusion are integrally formed .

  According to the present invention, since the number of crossovers of the crossover wires on the axial end face of the stator core is reduced, the axial protrusion dimension of the projections (ribs or the like) on which the crossover wires are hung can be reduced. As a result, the axial length of the stator can be reduced.

It is a side view of the stator of the motor which concerns on Embodiment 1 of this invention. It is a back front view of the stator before winding a winding. It is a model front view of the stator after winding. It is the model expanded view (A figure) showing the winding method of a winding, and the wiring system figure (B figure) of a winding. It is the back front view of the stator which concerns on the example of a change. It is the rear perspective view (A figure) of the conventional stator, and the front view (B figure) showing the winding method.

(Embodiment 1)
Hereinafter, the stator of the motor according to the first embodiment of the present invention will be described with reference to FIGS. The stator of the motor according to the present embodiment is a stator of a motor used for an electric tool, and a side view of the stator is shown in FIG. FIG. 2 is a rear front view of the stator before winding the winding, and FIG. 3 is a schematic front view of the stator after winding. 4A is a schematic development view showing a winding method, and FIG. 4B is a wiring system diagram of the winding. FIG. 5 is a rear front view of the stator according to the modified example.
The front and rear described in the figure correspond to the front and rear of the stator.

<About the outline of the stator 10>
As shown in FIGS. 1 and 2, the stator 10 includes a cylindrical stator core 12, and six magnetic poles P <b> 1 to P <b> 6 are provided on an inner peripheral surface 12 e of the stator core 12. . The six magnetic poles P1 to P6 are arranged at equal intervals in the circumferential direction, and each magnetic pole P1 to P6 protrudes by an equal dimension radially inward. The stator core 12 and the magnetic poles P1 to P6 are formed by laminating iron plates 12p formed in a predetermined shape in the axial direction.
Both ends in the axial direction and the inner peripheral surface of the stator core 12 and the outer peripheral surfaces (portions excluding the front end surface) of the magnetic poles P1 to P6 are covered with a resin insulator 20. Then, windings 31, 32, and 33 are wound around the outer peripheral surfaces of the magnetic poles P1 to P6 as described later.

As shown in FIGS. 1 and 2, six protrusions 22 on which the windings 31, 32, and 33 are hung are projected on the insulator 20 positioned at the rear end in the axial direction of the stator core 12. Is formed. As shown in FIG. 2, four of the six protrusions 22 are formed at the same position in the circumferential direction as the magnetic poles P1, P3, P4, and P6. Further, the remaining two protrusions 22 are displaced in the circumferential direction with respect to the magnetic pole P2 (positions displaced in the magnetic pole P1 side) and displaced in the circumferential direction with respect to the magnetic pole P5 (on the magnetic pole P6 side). (Position shifted to). Since the six protrusions 22 are formed at intervals in the circumferential direction in this way, the connecting wires 31u, 32v, and 33w described later are outside the protrusions 22 as shown in FIG. Wiring can be performed in the circumferential direction in a state where the wire is wound around.
In FIG. 3, the crossover lines 31u, 32v, and 33w are shown to be separated from the projections 22 in the radial direction, but this is because the crossover lines 31u, 32v, and 33w are schematically shown in an easy-to-see manner. In addition, the actual crossover lines 31u, 32v, and 33w are in close contact with the outer peripheral surface of the protrusion 22. Therefore, the overlapping portions in the radial direction of the crossover lines 31u, 32v, and 33w in FIG. 3 are actually overlapping portions in the axial direction.

<About the winding method of the stator 10>
Three-phase windings 31, 32, and 33 are wound around the six magnetic poles P1 to P6. As shown in FIG. 4 (B), the three-phase windings 31, 32, and 33 are composed of a U-phase winding 31, a V-phase winding 32, and a W-phase winding 33. Windings 31, 32, 33 are connected in a Y-shape.
As shown in FIG. 3, the U-phase winding 31 is wound around a magnetic pole P1 and a magnetic pole P4 at a position facing the magnetic pole P1 across the center of the stator core 12, and the magnetic pole P1 and the magnetic pole P4 are wound. The connecting line 31u is between. That is, as shown in FIG. 4A, the U-phase winding 31 is first wound around the magnetic pole P1. Thereby, the coil U1 is formed at the position of the magnetic pole P1. Next, after winding 31 from coil U1 is hung on protrusion 22 at a position corresponding to magnetic pole P1, it is bent to the right in the circumferential direction and wound around other protrusion 22 from the outside. That is, the crossover wire 31 u is wound in the right direction (forward direction) along the outer periphery of the insulator 20. Then, the winding wire 31 (crossover wire 31u) wound in the forward direction by about 180 ° up to the position of the magnetic pole P4 is hung on the protrusion 22 at the position corresponding to the magnetic pole P4, and is then wound around the magnetic pole P4. Thereby, the coil U2 is formed at the position of the magnetic pole P4.

The V-phase winding 32 is wound around the magnetic pole P2 and the magnetic pole P5 at a position facing the magnetic pole P2, and the connecting wire 32v is between the magnetic pole P2 and the magnetic pole P5. That is, the V-phase winding 32 is first wound around the magnetic pole P2. Thereby, the coil V1 is formed at the position of the magnetic pole P2. Next, after the winding wire 32 coming out of the coil V1 is hung on the protrusion 22 at a position corresponding to the magnetic pole P2 (position shifted in the circumferential direction), it is bent to the left in the circumferential direction, On the other hand, it is wound from the outside. That is, the crossover wire 32v is wound in the left direction (reverse direction) along the outer periphery of the insulator 20. As shown in FIGS. 4 and 4A, the crossover line 32v is overlapped with the U-phase crossover line 31u in the axial direction between the protrusion 22 of the magnetic pole P1 and the protrusion 22 of the magnetic pole P2.
Then, the winding wire 32 (crossover wire 32v) wound in the reverse direction by about 180 ° from the position of the magnetic pole P2 to the position of the magnetic pole P5 is hung on the protrusion 22 at the position corresponding to the magnetic pole P5, and then wound on the magnetic pole P5. Be dressed. Thereby, the coil V2 is formed at the position of the magnetic pole P5.

The W-phase winding 33 is wound around a magnetic pole P3 and a magnetic pole P6 at a position facing the magnetic pole P3, and a connecting wire 33w is formed between the magnetic pole P3 and the magnetic pole P6. That is, the W-phase winding 33 is first wound around the magnetic pole P3. Thereby, the coil W1 is formed at the position of the magnetic pole P3. Next, after the winding wire 33 coming out of the coil W1 is hung on the protrusion 22 at the position corresponding to the magnetic pole P3, it is bent to the right in the circumferential direction and wound around the other protrusion 22 from the outside. That is, the crossover wire 33w is wound in the right direction (forward direction) along the outer periphery of the insulator 20. As shown in FIGS. 1 and 3, the crossover wire 33w is overlapped in the axial direction with the U-phase crossover wire 31u between the protrusion 22 of the magnetic pole P3 and the protrusion 22 of the magnetic pole P4, and the protrusion 22 of the magnetic pole P5 and the magnetic pole P5. Between the protrusions 22 and the V-phase connecting wire 32v in the axial direction.
Then, the winding wire 33 (crossover wire 33w) wound in the forward direction by about 180 ° from the position of the magnetic pole P3 to the position of the magnetic pole P6 is hung on the protrusion 22 at a position corresponding to the magnetic pole P6, and then wound around the magnetic pole P6. Is done. Thereby, the coil W2 is formed at the position of the magnetic pole P6.
As shown in FIG. 4B, the winding 31 coming out from the U-phase coil U2, the winding 32 coming out from the V-phase coil V2, and the winding 33 coming out from the W-phase coil W2. Connected to each other.

<Advantages of Stator 10 According to the Present Embodiment>
According to the stator 10 according to the present embodiment, the connecting wire 32v of the V-phase winding 32 constituting the three-phase winding is compared with the connecting wires 31u and 33w of the U-phase and W-phase windings 31 and 33. It is wound in the opposite direction. For this reason, compared with the case where all the connecting wires 31u, 32v, 33w of the windings 31, 32, 33 of each phase are wound in the forward direction, the connecting wires 31u, 32v, 33w at the axial end surface of the stator core 12 are used. The number of overlaps becomes smaller. That is, when all the connecting wires 31u, 32v, and 33w are wound in the forward direction, there are portions that are three-tiered in the axial direction, whereas one connecting wire 32v is wound in the opposite direction, The number of overlapping of the crossover lines 31u, 32v, 33w is two stages.
Therefore, the protruding dimension in the axial direction of the projection 22 on which the connecting wires 31u, 32v, and 33w are hung can be reduced, and the axial dimension of the stator 10 is reduced.
Further, since the winding directions of the connecting wires 31u, 32v, 33w are set to alternate with the forward direction, the reverse direction, and the forward direction according to the phase order of the windings 31, 32, 33, the connecting wires 31u, 32v, 33w overlaps evenly in the circumferential direction of the stator core 12, and the number of overlaps is biased in the circumferential direction, so that there is no inconvenience that a part with a large number of overlaps is generated.

<Example of change>
Here, the present invention is not limited to the above-described embodiment, and can be modified without departing from the gist of the present invention. For example, in the present embodiment, the stator 10 having six magnetic poles P and including the three-phase windings 31, 32, 33 is illustrated, but the number of poles of the magnetic poles P and the number of winding phases can be changed as appropriate.
Moreover, although the U-phase and W-phase connecting wires 31u and 33w are wound in the forward direction and the V-phase connecting wire 32v is wound in the reverse direction, the U-phase and W-phase connecting wires 31u and 33w are reversed. It is also possible to wind the V-phase connecting wire 32v in the forward direction.
Further, in the present embodiment, as shown in FIG. 2, the example in which the protrusions 22 are provided by the number equal to the number of magnetic poles (six poles) of the stator 10 is shown, but as shown in FIG. It is also possible to integrally form the protrusions P1 and P6) and the protrusions for the reverse direction (P2 and P5). Furthermore, although the example in which the connecting wires 31u, 32v, and 33w of each phase are hung on the protrusion 22 is shown, a cylindrical member is formed instead of the protrusion 22, and the connecting wires 31u, 32v, and 33w are arranged in the circumferential direction of the cylindrical member. It may be configured to hang on a slit-shaped notch formed at a predetermined position.

10 ... Stator 12 ... Stator core 20 ... Insulator 22 ... Protrusions (For forward and reverse directions)
31... U phase winding 32... V phase winding 33... W phase winding 31 u... U phase transition wire 32 v. Crossover wire 33w ··· W-phase crossover wires P1 to P6 ·· Magnetic pole

Claims (4)

It is formed in a cylindrical shape by laminating plates, and the first magnetic pole, the second magnetic pole, the third magnetic pole, the fourth magnetic pole, the fifth magnetic pole, and the sixth magnetic pole are arranged in the circumferential direction on the inner peripheral surface. A stator core formed in a slanted state, a first winding wound around the first magnetic pole and the fourth magnetic pole and having a first jumper, the second magnetic pole and the fifth magnetic pole A second winding wound around the magnetic pole and having a second jumper; a third winding wound around the third and sixth magnetic poles and having a third jumper; And an insulator having a plurality of protrusions protruding in the axial direction and positioned at an axial end of the stator core, and the protrusions of the insulator include the first jumper wire, the second jumper wire, and the first An electric tool using a stator having a configuration in which three crossovers are hung,
Between the first magnetic pole and the second magnetic pole, a first crossover and a second crossover overlap in the axial direction,
Only the first crossover is disposed between the second magnetic pole and the third magnetic pole,
A first crossover and a third crossover overlap in the axial direction between the third magnetic pole and the fourth magnetic pole,
Only the third crossover is arranged between the fourth magnetic pole and the fifth magnetic pole,
Between the fifth magnetic pole and the sixth magnetic pole, a third connecting wire and a second connecting wire overlap in the axial direction,
Only the second jumper is disposed between the sixth magnetic pole and the first magnetic pole,
Of the connecting wires that are hung on the protrusions of the insulator and overlapped in two stages in the axial direction of the stator core, the side surface on the outer side in the axial direction of the connecting wire located outside in the axial direction is in the circumferential direction of the stator core. A power tool characterized by being entirely exposed from the insulator . The electric tool according to claim 1,
The first winding, the second winding, and the third winding have Y-shaped ends that are respectively wound around three magnetic poles adjacent in the circumferential direction of the stator core. An electric tool characterized by that. The electric tool according to claim 1,
After the first winding is wound around the fourth magnetic pole, the second winding is wound around the fifth magnetic pole, and then the third winding is the sixth winding. After being wound around the magnetic poles, the electric tools are connected to each other. The electric tool according to claim 1,
The second crossover line straddles the first magnetic pole and the sixth magnetic pole,
The third crossover straddles the third magnetic pole, the fourth magnetic pole, the fifth magnetic pole, and the sixth magnetic pole,
The insulator includes a first protrusion formed at a position shifted in a circumferential direction with respect to the fifth magnetic pole, the second protrusion and the third connecting line being hung, and the second protrusion A crossover wire and a third crossover wire, and a second protrusion formed at the same position in the circumferential direction with respect to the sixth magnetic pole,
The power tool, wherein the first protrusion and the second protrusion are integrally formed .

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