WO2000048292A1 - Motor - Google Patents

Abstract

Pairs (two poles) of coils (2u, 2v, 2w) for respective three phases U, V and W are opposed to each other in the radial direction of a stator (1) and connected parallel respectively. A neutral line (9v) of the V-phase coil (2v) is connected to the neutral lines (9u, 9w) of the respective U-phase and W-phase coils (2u, 2w) at the points (20uv, 20vw), thereby forming a neutral point of a three-phase star connection. That is, every two neutral lines of the neutral lines (9u to 9w) are connected at the two points to form a neutral point, and therefore the neutral point is formed by connection of neutral lines the number of which is smaller than conventional.

Description

 Technical field of motors

 The present invention relates to a motor having a concentrated winding structure in which a three-phase star-connected coil is directly wound on a plurality of magnetic pole teeth of a stator via an insulating member, and in particular, relates to each coil. The present invention relates to an electric motor having an improved connection structure for a neutral wire from a motor. Background technology

 FIGS. 18 and 19 show a stator 1 of a general electric motor to which the present invention is applied. The stator 1 includes a stator core 10 having a plurality of (in this case, 6 poles) magnetic pole teeth 12 arranged at intervals in the circumferential direction. The magnetic pole teeth 12 of the stator core 10 are each provided with a three-phase star-connected coil 2 (via an insulating frame 3).

 Conventionally, in such a three-phase star connection motor, six neutral wires from a six-pole coil are connected to each other to form a neutral point. For example, FIG. 20 shows a wiring diagram of a conventional motor in which coils of a total of six poles, two poles each for each phase of the stator 1, are connected in parallel.

 In FIG. 20, a pair (two poles) of coils 2 u, 2 v, and 2 w are provided for the three phases U, V, and W, respectively, so as to face the stator 1 in the radial direction. A pair of coils 2 u, 2 v, and 2 w are connected in parallel. And these total 6-pole coil 2 I! By connecting the six neutral wires 90 u to 90 w from 22 w to each other, a neutral point in the three-phase star connection is formed.

 In this case, 6 neutral wires 9 Ο ι! Connections of up to 90 w are made by means such as welding, soldering, and connection by lead wires. In a structure in which a coil is wound directly around each magnetic pole tooth 12, connection is made using a circuit board or the like.

The conventional motor as described above has the following problems. In other words, many neutral lines (six in the case of the six-pole type shown in Fig. 20) are connected to each other to form a neutral point. Since the connection has to be made, the connection is troublesome, and there is a high possibility that a connection failure will occur, and there is a problem in reliability. Also, when connecting using a circuit board or the like, there is a problem in terms of cost. Disclosure of the invention

 The present invention has been made in view of such a point, and the connection in the stator is improved by the connection structure of the stator in which a neutral point can be formed by connecting a smaller number of neutral wires than before. An object of the present invention is to provide an easy, reliable, and low-cost motor.

 In order to achieve this object, the present invention includes a rotor and a stator, wherein the stator has a plurality of magnetic pole teeth arranged at intervals in a circumferential direction, and an insulating member for the magnetic pole teeth. A three-phase star-connected coil of a concentrated winding directly wound through a coil, and a neutral wire from any one of the three-phase coils in the stator is An object of the present invention is to provide a motor characterized in that neutral wires from two-phase coils are connected at one point each.

 According to this motor, the neutral wire from any one-phase coil is connected to the neutral wire from the other two-phase coils at one point each, thereby forming a three-phase star connection. A neutral point is formed. That is, the neutral point is formed by connecting two neutral wires each at a total of two connection portions. Therefore, a neutral point can be formed by connecting a smaller number of neutral wires than before. For this reason, it is possible to provide a motor that is easy to connect to the stator, has high reliability, and is low in cost.

 In this electric motor, the coils of each phase of the stator are constituted by coils of a plurality of poles connected in parallel with each other, and the coils of the plurality of poles are continuously wound, and the coils of the poles of the plurality of poles are connected. Crossover may be the neutral wire.

In this case, the stator has a two-pole coil for each phase, the rotor has four poles, and the insulating member of the stator is interposed between each pole tooth and the coil. The insulating frame is formed at an interval in the circumferential direction of the stator corresponding to each magnetic pole tooth of the stator, and protrudes in the axial direction from an end of the stator. In a two-pole coil having a plurality of protrusions and constituting each phase of the stator, the crossover wire extending from the winding end of the coil of one of the poles is folded at the protrusion of the insulating frame. In this case, the height of the protruding portion of the insulating frame from the end of the stator at the folded portion of the crossover wire may be configured to be connected to the winding start end of the coil of the other pole. It is preferable that the height of the connecting portion between the neutral wires is substantially the same as the height from the end of the stator.

 Further, the present invention includes a rotor and a stator, wherein the stator is provided with a plurality of magnetic pole teeth arranged at intervals in a circumferential direction, and directly wound on the magnetic pole teeth via an insulating member. A three-phase star-connected coil of concentrated windings, wherein the coils of each phase of the stator are constituted by coils of a plurality of poles connected in parallel with each other; It is assumed that the coils are continuously wound, the crossover between the coils having the plurality of poles is a neutral wire from each phase coil, and the neutral wires from the three-phase coils are connected at one place. It is intended to provide a motor having features.

 According to this motor, a neutral point in the three-phase star connection is formed by connecting a total of three neutral wires (crossover wires) from the three-phase coils at one place. Therefore, also in this case, a neutral point can be formed by connecting a smaller number of neutral wires than before. For this reason, it is possible to provide an electric motor that is easy to connect to the stator, has high reliability, and is low in cost.

 The neutral line of the coil of each phase may be arranged on the opposite side of the stator from the lead wire from the coil of each phase.

 The connection between the neutral wires can be made using a crimp terminal or a press contact terminal. As a result, the connection can be made extremely easily and reliably as compared with the case of welding or soldering.

 The insulating member of the stator is an insulating frame interposed between each magnetic pole tooth and the coil, and a terminal fixing portion for holding a press-contact terminal having an opening is formed on the insulating frame. The connection between the wires may be made by press-fitting the neutral wire from the opening into the press-contact terminal.

As a result, the neutral wires can be connected to each other simply by press-fitting the neutral wire from the opening into the press contact terminal, so that the connection can be made extremely easily and reliably. I can. In addition, since the press-connecting terminal is held by the terminal fixing portion of the insulating frame, the connection portion between the neutral wires can be reliably held by the stator (via the insulating frame).

 The insulating member of the stator is an insulating frame interposed between each magnetic pole tooth and the coil, and a neutral wire holding member for holding a portion before and after the connection portion of the neutral wire in the insulating frame. A part may be formed. Thus, the connection portion between the neutral wires can be held at a predetermined position with respect to the stator (via the insulating frame) by the neutral wire holding portion of the insulating frame.

 The insulating member of the stator is an insulating frame interposed between each magnetic pole tooth and the coil, and the insulating frame has an interval in a circumferential direction of the stator corresponding to each magnetic pole tooth of the stator. A plurality of protruding portions that are formed and protrude in the axial direction from ends of the stator, and the neutral wires to be connected to each other are arranged side by side between the adjacent protruding portions of the insulating frame. In addition to the arrangement, these neutral wires may be connected to each other by crimp terminals.

 In this case, the connection portion between the neutral wires may be arranged corresponding to a boundary portion between the coils adjacent in the circumferential direction, or may be arranged on an envelope of a plurality of protruding portions in the insulating frame. BRIEF DESCRIPTION OF THE FIGURES

 FIG. 1 is a connection diagram including a stator core in a first embodiment of an electric motor according to the present invention,

 FIG. 2 is a schematic connection diagram showing a simplified connection diagram shown in FIG. 1,

 FIG. 3 is a connection diagram including the winding directions and the like of the motor shown in FIG. 1,

 FIG. 4 is a plan view of the electric motor shown in FIG.

 FIG. 5 is a partial elevational view showing the neutral wire arrangement side of the motor shown in FIG. 1,

 FIG. 6 is a diagram showing the shape of the magnetic pole teeth and the insulating frame of the motor shown in FIG. 1 in a cross section of the stator core,

 FIG. 7 is a diagram showing a connection state of the neutral wires in the X-X line cross section of FIG. 5,

FIG. 8 is a perspective view of the crimp terminal shown in FIG. 7, FIG. 9 is a partial plan view of a stator for illustrating a terminal fixing portion of an insulating frame in a second embodiment of the electric motor according to the present invention,

 FIG. 10 is a diagram showing the terminal fixing portion of the insulating frame in FIG.

 FIG. 11 is a sectional view taken along the line Z—Z in FIG.

 FIG. 12 is a connection diagram including a stator core in a third embodiment of the electric motor according to the present invention,

 FIG. 13 is a schematic connection diagram showing a simplified connection diagram shown in FIG.

 FIG. 14 is a connection diagram including a stator core, a winding direction, and the like in a fourth embodiment of the motor according to the present invention;

 FIG. 15 is a schematic diagram showing a simplified diagram of the diagram shown in FIG.

 FIG. 16 is a view showing a connection state in the case of using the crimp terminal shown in FIG. 8 in the same manner as FIG. 7 in the motor shown in FIG. 14,

 FIG. 17 is a perspective view showing another example of a connection portion between neutral wires in the electric motor shown in FIG.

 FIG. 18 is a plan view showing a stator of a general electric motor to which the present invention is applied. FIG. 19 is a longitudinal sectional view of the stator of the electric motor shown in FIG.

 FIG. 20 is a connection diagram including a stator core in a conventional electric motor. BEST MODE FOR CARRYING OUT THE INVENTION

 Next, an embodiment of the present invention will be described with reference to the drawings. 1 to 17 are views showing an embodiment of the electric motor according to the present invention. In the embodiment of the present invention shown in FIGS. 1 to 17, the same components as those of the general electric motor shown in FIGS. 18 and 19 are denoted by the same reference numerals, and This will be described with reference to FIG.

 [First Embodiment]

 First, a first embodiment of the present invention will be described with reference to FIGS. 1 to 8, FIG. 18 and FIG.

FIGS. 18 and 19 show a stator 1 of a general electric motor to which the present invention is applied. Have been. The stator 1 has a plurality of (in this case, 6 poles) magnetic pole teeth 12 arranged at intervals in the circumferential direction, and a yoke core 14 connecting the outer peripheral sides of these magnetic pole teeth 12. It has an iron core 10. Each of the magnetic pole teeth 12 of the stator core 10 is provided with a three-phase star-connected coil 2 (via an insulating frame 3).

 Next, FIGS. 1 to 3 show connection diagrams of the electric motor of the present embodiment. As shown in FIGS. 1 to 3 (particularly, FIG. 2), in the stator 1 of the electric motor of the present embodiment, a coil 2 I! Having a total of six poles, two poles for each phase. ~ 2 w are connected in parallel in a three-phase star. Further, as shown in FIG. 4, the electric motor includes a rotor R having four magnetic poles, which is coaxially arranged in the stator 1.

 Returning to FIGS. 1 to 3 again, a pair (two poles) of coils 2u, 2v, and 2w are provided for the three phases U, V, and W, respectively, in the radial direction of the stator 1 (see FIG. 1). Or see Fig. 3), and a pair of coils 2u, 2v, 2w constituting each phase are connected in parallel, respectively.

 Then, for the neutral wire 9 V from the V-phase coil 2 V of the three phases in the stator 1, the neutral wires 9 u, 9 w from the U-phase and W-phase coils 2 u, 2 w They are connected at 20 uv and 20 vw, respectively.

 Here, as shown in FIG. 4, for each magnetic pole tooth 12 of the stator 1, the coil 2 I! To 2 w are directly wound through the insulating frame 3 to form a concentrated winding structure. Further, as shown in FIG. 1 or FIG. 3, a pair of coils (2u, 2u) to (2w, 2w) constituting each phase is continuously wound. And the crossover between a pair of coils (2u, 2ι!) To (2w, 2w) wound continuously in this way is a neutral wire 9 I! Make up ~ 9W.

These neutral wires (crossover wires) 911 to 9 \ ^ are coils 2 \! For each phase with respect to the axial direction of the stator 1. ~ 2w lead wire 8 I! 8w (see FIGS. 1 to 3). That is, each phase coil 2 I! Lead wire from ~ 2 w 8 I! -8 w are drawn out from the side opposite to that shown in Figure 4 or Figure 5 with respect to the stator 1. Fig. 3 shows the lead wire 8 I! ~ 8 w Placement side is indicated by solid line, neutral line (crossover line) 9! ~ 9 w The placement side is indicated by a broken line, and the lead wire 8ι! ~ 8w distribution This shows a state in which the stator 1 is viewed from the mounting side.

 Next, the magnetic pole teeth 12 of the stator 1 and the insulating frame 3 attached to the stator 1 will be described in detail. As shown in FIG. 6, each magnetic pole tooth 12 has a main rod portion 12a extending radially inward from the yoke iron core 14, and an inner peripheral portion 12b formed on the distal end side of the main rod portion 12a. have. The inner peripheral portion 12b extends on both sides of the main rod portion 12a along the outer periphery of the rotor R (see FIG. 4).

 An insulating frame 3 is attached so as to cover the inner surface of a portion (so-called winding slot) 16 of the stator core 10 substantially surrounded by the yoke core 14 and the magnetic pole teeth 12. That is, the insulating frame 3 includes a hollow web portion 30 that covers the main rod portion 12a of each magnetic pole tooth 12, an inner peripheral flange portion 31 that covers the inner peripheral portion 12b of each magnetic pole tooth 12, and a yoke core. And an outer peripheral flange portion 32 that covers the inside of 14. As shown in FIGS. 4, 8 and 19, the coil 2 I! Is wound around each magnetic pole tooth 12 (the main rod portion 12a) through the insulating frame 3. ~ 2 w are wound.

 Next, as shown in FIG. 4 and FIG. 5, the insulating frame 3 has six pairs of protrusions formed at intervals in the circumferential direction of the stator 1 corresponding to the respective magnetic pole teeth 12 of the stator 1. 33. These protruding portions 33 are provided from above the outer peripheral flange portion 32 (see FIG. 4) so as to protrude in the axial direction from the end portion 1a of the stator 1 (see FIG. 5).

 And between the protruding parts 33 (corresponding to the magnetic pole teeth 12 adjacent in the circumferential direction), two neutral wires (9 u, 9 v) (9 v, 9 w) to be connected to each other The neutral lines (9u, 9v) and (9v-, 9w) are connected to each other by 20uv and 20vw, respectively. In this case, the connection portions 20 uV and 20 vw between the neutral wires 9 u to 9 w are respectively arranged corresponding to the boundary portions between the circumferentially adjacent coils 2 u, 2 v and 2 w, 2 u. Have been.

Where the neutral 9ι! As shown in FIG. 7, the connection between 99 w is made using a crimp terminal 40. As shown in FIG. 8, before the connection, the crimp terminal 40 has a substantially U-shaped cross-sectional shape having an opening 40a, and an uneven portion 4 Ob is formed on the inner surface thereof. The crimp terminal 40 is crimped by a special tool or device to be crimped around two neutral wires 9 u to 9 w to be connected as shown in FIG. Break the covering of the neutral wire 9 u to 9 w by the part 40 b Neutral 9 I! 99 w are connected to each other.

 Next, as shown in Fig. 5, the neutral wire 9! Neutral wire holding portion 36 for holding 99 w is formed. Each neutral wire holding portion 36 is formed by a groove 35 formed on the outer peripheral side of the protrusion 33 and a pair of protrusions 34 protruding outward from both upper and lower sides of the groove 35 (see also FIG. 4). It is configured. Then, as shown in Figs. 4 and 5, the neutral wire 9 I! In particular, the portions before and after the connection portions 20 uv and 20 vw in 99 w are particularly surely held by the pair of projections 34 of the neutral wire holding portion 36.

 Here, as shown in FIG. 4, each neutral wire (crossover wire) 9u to 9 extends along the outside of the plurality of protrusions 33 in the insulating frame 3 so as to form an envelope of these protrusions 33. It is being routed. Therefore, the connecting portions 20 uv and 20 vw between the neutral wires are also arranged on the envelope of the plurality of protrusions 33 in the insulating frame 3.

 Next, as shown in FIGS. 4 and 5, in two-pole coils 2u, 2v, and 2w constituting each phase of stator 1, coils 2u, 2v, and 2w of one pole The neutral wire (crossover wire) 9u, 9V, 9w extending from the winding end 7u, 7V, 7w of the winding is folded back at the protrusion 33 of the insulating frame 3, and the coil 2u, 2V of the other pole , 2w, the winding ends 6 u, 6v, 6w.

 In this case, the neutral wire (crossover wire) at the protrusion 33 of the insulating frame 3 9 I! The height from the stator end 1 a of the folded part of ~ 9 w is the neutral wire 9 I! The heights from the stator end 1a of the connecting parts 20uV and 20vw between the 9w and 9w are almost the same (see Fig. 5).

In this embodiment, the neutral wires 9 u and 9 w from the U-phase and W-phase coils 2 u and 2 w are compared with the neutral wire 9 V from the V-phase coil 2 V in the stator 1. Although the description has been given of the case where the connection is made at each of the points, the present invention is not limited to this. It is only necessary to connect the neutral wires from the two-phase coils at one point each. That is, the neutral wire 9 u from the U-phase coil 2 u may be connected to the neutral wire 9 v, 9 w from the V-phase and W-phase coil 2 V, 2 w at one point each, Also, the neutral wires 9 u and 9 V from the U-phase and V-phase coils 2 u and 2 v may be connected at one point each to the neutral wire 9 w from the W-phase coil 2 w . Next, the operation and effect of the present embodiment having such a configuration will be described. According to the present embodiment, any one phase coil 2 I! Of the three phases in stator 1 is! Neutral wire from 2 w 9 I! For other 2 phase coil 2 I! The neutral point in the three-phase star connection is formed by connecting the neutral lines 9 u to 9 w from 1 to 2 w at one point each.

 In other words, two neutral wires 9 I! Since the neutral point is formed by connecting ~ 9 w to each other, a neutral point can be formed by connecting a smaller number of neutral wires than before. For this reason, it is possible to provide an electric motor that is easy to connect to the stator 1 and that is excellent in reliability and low in cost.

 In this case, the neutral wire 9 I! Since the connection between the wires 9 to 9 w is made using the crimp terminal 40, the connection can be made extremely easily and reliably as compared with the case of welding or soldering.

 In addition, since the neutral wire holding portion 36 for holding the neutral wires 9 u to 9 w is formed on each protruding portion 33 of the insulating frame 3, the neutral wire holding portion 36 The connection portion between the neutral wires 9 u to 9 w can be held at a predetermined position with respect to the stator 1 (via the insulating frame 3).

 [Second embodiment]

 Next, a second embodiment of the present invention will be described with reference to FIGS. In this embodiment, as shown in FIG. 9 to FIG. 11, instead of the crimp terminal 40, the press-contact terminal 42 fixed to the insulating frame 3 is ffled and the neutral wire 9I! 1 to 9 w are connected to each other, and other configurations are the same as those of the first embodiment shown in FIGS. 1 to 8.

 Specifically, as shown in FIGS. 9 to 11, terminal fixing portions 37 corresponding to the connection portions 20 uv and 2 Ovw are formed on the insulating frame 3. The terminal fixing portion 37 has a pair of upper and lower holding plate members 38 projecting in the outer peripheral direction of the stator 1, and holds the press-contact terminal 42 between the pair of holding plate members 38. I have. The tip of the pair of holding plate members 38 has a neutral wire 9 I! It is formed in a taper shape to facilitate insertion of ~ 9 w.

The press contact terminal 42 had an opening 42 a as shown in FIGS. 10 and 11. It has a substantially u-shaped cross-sectional shape, and a plurality of blade-shaped ribs 42b extending in the cross-sectional direction are formed on the inner surface thereof. Then, the press contact terminal 42 is connected to the two neutral wires 91 through the opening 42a! 9 w to 9 w are sequentially pressed to fix the neutral wires 9 u to 9 w, and the neutral wires 9 I! Break through the coating of ~ 9 w and the neutral 9 ι! ~ 9w are made to conduct each other.

 Next, the operation and effect of the present embodiment having such a configuration will be described. According to the present embodiment, a neutral wire 9 I! Simply press-fit ~ 9 w and the neutral wire 9 I! ~ 9w can be connected to each other, making it extremely easy and reliable. In addition, since the insulation displacement terminal 3 is held by the terminal fixing portion 37 of the insulating frame 3, the neutral wire 9 I! The connection portions 20 uv and 20 vw between 9 9 w can be securely held to the stator 1 (via the insulating frame 3).

 [Third embodiment]

 Next, a third embodiment of the present invention will be described with reference to FIGS. This embodiment is different from the first embodiment in that a pair of coils 2u, 2v, and 2w constituting each phase are connected in series, as shown in FIGS. Unlike the embodiment, the other configuration is substantially the same as the first embodiment shown in FIGS. 1 to 8. In the case of the present embodiment, as shown in FIGS. 12 and 13, out of the three phases of the stator 1, the U phase Neutral wires 9 u and 9 V from the V-phase coils 2 u and 2 v are connected by 20 uw and 20 vw, respectively.

 In this embodiment, the neutral wire from any one of the three phases of the stator 1 is not limited to the neutral wire from the other two phases. You only need to connect them one at a time. That is, for the neutral wire 9 u from the U-phase coil 2 u, the neutral wires 9 v and 9 w from the V-phase and W-phase coils 2 v and 2 w are respectively placed at one position. One neutral wire 9 u, 9 w from the U-phase and W-phase coils 2 u, 2 w may be connected to the neutral wire 9 V from the V-phase coil 2 V, respectively. Connections may be made at each location.

Also in the case of the present embodiment, any one of the three phases of the stator 1 Le 2ι! Neutral wire from ~ 2w 9! For other 9W, 2 phase coil 2 I! By connecting the neutral wires 9 u to 9 w from 1 to 2 w at one point each, a neutral point in the three-phase star connection is formed. Neutral points can be formed by connecting a smaller number of neutral wires than before. For this reason, it is possible to provide an electric motor that is easy to connect to the stator 1 and that is excellent in reliability and low in cost.

 [Fourth embodiment]

 Next, a fourth embodiment of the present invention will be described with reference to FIGS. In the present embodiment, as shown in FIGS. 14 to 16, a three-phase coil 2I! The first embodiment differs from the first embodiment in that neutral wires from 2 to 2 w are connected to each other at one place, and other configurations are substantially the same as those in the first embodiment shown in FIGS. 1 to 6.

 Then, in the case of the present embodiment, as shown in FIGS. 14 and 15, two-pole coils (2v, 2u), which are different from each other in a phase different from each other by 300 degrees in the circumferential direction,

(2w, 2v) and (2u, 2w) are each wound continuously. In this case, the coils of each two-pole which is卷線continuously (2v, 2 u), ( 2w, 2 ν) Ν

Assuming that the crossovers between (2 u, 2 w) are 9 vu, 9 wv, and 9 uw, respectively, the neutral wires from the coils 2 u, 2 v, and 2 w of each phase of U, V, and W are two each. Crossover

(9Vu, 9uw), (9Vu, 9wv) ヽ (9wv, 9uw).

 Then, the crossovers 9 vu, 9 wv, and 9 uw forming the neutral conductor from the three-phase coils 2 u to 2 w are connected to each other at one location 2 Ouvw. As shown in FIG. 16, the connection between the neutral wires (crossover wires) 9vu, 9wv, and 9uw is performed using a crimp terminal 40 similar to that shown in FIG.

 Next, the operation and effect of the present embodiment having such a configuration will be described. According to this embodiment, the three-phase coil 2! By connecting the three crossovers 9 vu, 9wv, and 9 uw at a single point, a neutral point in the three-phase star connection is formed. However, a neutral point can be formed by connecting a smaller number of neutral lines 9 vu, 9wv, and 9 uw than before. For this reason, it is possible to provide an electric motor that is easy to connect to the stator 1 and that is excellent in reliability and low in cost.

In FIG. 14, different phases at positions 300 degrees apart in the circumferential direction are formed. The case where the two-pole coils (2 v, 2 u), (2 w, 2 v) and (2 u, 2 w) are wound continuously has been described. Is not limited to this. In other words, regardless of whether the phases are different from each other or the same phase, any two-pole coils 2u to 2w of the stator 1 may be continuously wound.

 Here, in the present embodiment, instead of the connection by the crimp terminal 40 shown in FIG. 16, a connection by a combination of the press contact terminal 45 and the terminal fixing portion 44 as shown in FIG. 17 may be used. In FIG. 17, on the insulating frame 3, a terminal fixing portion 44 opened upward is formed. The terminal fixing part 44 has three pairs of grooves 44 a that receive three connecting wires 9 vu, 9 wv, and 9 uw in parallel, and three connecting portions that contact the underside of each connecting wire 9 vu, 9 wv, and 9 uw. It has a projection 44b.

 The press contact terminal 45 has three grooves (openings) 45 a corresponding to the grooves 44 a of the terminal fixing part 44. In this case, by inserting the crimping terminals 45 into the terminal fixing portions 44, the crossovers 9vu, 9wv, 9uw are press-fitted into the respective groove portions 45a of the press contact terminals 45, and the crossovers 9vu, 9wv , 9 uw of the coating is broken to conduct the neutral wires.

 In the above embodiment, the case where the coils 2 u to 2 w (and the magnetic pole teeth 12) having a total of 6 poles of 2 poles for each phase are provided has been described. More than 9 poles More than 9 coils 2 I! The present invention can also be applied to a case where w2 w (and the magnetic pole teeth 12) are provided.

 Also, a case has been described in which the stator 1 uses the integral stator core 10 in which the yoke iron core 14 and each magnetic pole tooth 12 are integrated, but the yoke iron core 14 and each magnetic pole tooth 12 are assembled as a unit. Alternatively, a split stator core may be used.

 In this specification, the term "crimp terminal" refers to a terminal member that connects wires by relatively large deformation of the terminal itself by caulking or the like, and the term "crimp terminal" refers to a press-fitting of a wire. It refers to a terminal member that connects wires with almost no deformation of the terminal itself.

Claims

 Scope of Claim 1. Provide a rotor and stator,  The stator includes a plurality of magnetic pole teeth arranged at intervals in a circumferential direction, and a concentrated winding three-phase star-connected coil wound directly on the magnetic pole teeth via an insulating member. Has,  It is characterized in that the neutral wire from any one of the three-phase coils in the stator is connected to the neutral wire from the other two-phase coils at each one point. Electric motor.  2. The coils of each phase of the stator are composed of plural-pole coils connected in parallel to each other, and the plural-pole coils are continuously wound, and the crossovers between the plural-pole coils are formed. 2. The electric motor according to claim 1, wherein the neutral wire is used.  3. The stator has a two-pole coil for each phase, and the rotor has four poles,  The insulating member of the stator is an insulating frame interposed between each magnetic pole tooth and the coil, and the insulating frame has an interval in a circumferential direction of the stator corresponding to each magnetic pole tooth of the stator. A plurality of protrusions formed in the axial direction and protruding from an end of the stator,  In the two-pole coil constituting each phase of the stator, the crossover wire extending from the winding end of the one-pole coil is folded back at the protrusion of the insulating frame, and the other-pole coil is wound. 3. The electric motor according to claim 2, wherein the electric motor is configured to be connected to a start end.  4. The height of the folded portion of the crossover wire from the end of the stator at the protrusion of the insulating frame is substantially the same as the height of the connection portion between the neutral wires from the end of the stator. 4. The electric motor according to claim 3, wherein:  5. With rotor and stator, The stator includes a plurality of magnetic pole teeth arranged at intervals in a circumferential direction, and a concentrated winding three-phase star-connected coil wound directly on these magnetic pole teeth via an insulating member. Has, The coils of each phase of the stator are constituted by coils of a plurality of poles connected in parallel with each other, and coils are wound continuously between arbitrary coils of the stator and the coils of the poles of the plurality of poles are continuously wound. An electric motor characterized in that the crossovers are neutral wires from the coils of each phase, and the neutral wires from the three-phase coils are connected at one point.  6. The electrode according to claim 1, 2 or 5, wherein the neutral wire of the coil of each phase is arranged on the opposite side of the stator from the lead wire from the coil of each phase. Motivation.  7. The electric motor according to claim 1, 2 or 5, wherein the connection between the neutral wires is made using a crimp terminal or a press contact terminal.  8. The insulating member of the stator is an insulating frame interposed between each magnetic pole tooth and the coil,  A terminal fixing portion for holding a press contact terminal having an opening is formed in the insulating frame, and the neutral wires are connected to each other by press-fitting the neutral wire into the press contact terminal from the opening. 6. The electric motor according to claim 1, wherein the electric motor is configured.  9. The insulating member of the stator is an insulating frame interposed between each magnetic pole tooth and the coil,  6. The electric motor according to claim 1, wherein a neutral wire holding portion for holding a portion before and after the connection portion of the neutral wire is formed on the insulating frame.  10. The insulating member of the stator is an insulating frame interposed between each magnetic pole tooth and the coil,  The insulating frame has a plurality of protrusions formed at intervals in the circumferential direction of the stator corresponding to the respective magnetic pole teeth of the stator and projecting in the axial direction from the end of the stator. ,  The neutral wires to be connected to each other are arranged side by side between the adjacent protrusions of the insulating frame, and the neutral wires are connected to each other by crimp terminals. Or the electric motor described in 5. 11. The electric motor according to claim 10, wherein a connection portion between the neutral wires is arranged corresponding to a boundary portion between coils adjacent in the circumferential direction. 12. The electric motor according to claim 10, wherein a connection portion between the neutral wires is arranged on an envelope of a plurality of protrusions in the insulating frame.