JP5991702B2 - AC generator - Google Patents

Description

  The present invention relates to an alternator, and more particularly to an improvement of an alternator capable of simultaneous output of three phases and a single phase.

  When using various working machines, lighting equipment, video / audio equipment, and other equipment (simply referred to as “load” in this specification) that are operated by electric power, especially outdoors such as construction sites and various event venues. A generator including a prime mover such as an engine is used as a power supply source for such a load.

  And in such a generator, the thing which can perform both a three-phase output and a single phase output in consideration of the difference in the input form of the load to be used is proposed.

  As shown in FIG. 12, as an AC generator configured to be able to perform both three-phase output and single-phase output, one of the three-phase windings u, v, and w is The intermediate tap T is provided at a position 100/115 from the neutral point O of the winding v, and the auxiliary winding induces a voltage equal to the voltage induced in the intermediate tap T in the opposite phase to the V-phase winding. An alternator is proposed in which n is added and a single-phase three-wire output is obtained at a terminal N connected to an intermediate tap T, a neutral point O, and an auxiliary winding (see Patent Document 1). .

  Further, in the AC generator described in Patent Document 1, the total amount of winding including the auxiliary winding n is large, and the applicant of the present application can reduce the amount of auxiliary winding in view of the fact that the armature coil is enlarged. As shown in FIG. 13A, the AC generator is configured with three-phase windings u, v, w and auxiliary winding n, and three-phase windings u, v, w The point that the intermediate tap T is provided in any one phase (the V phase in the example of FIG. 13A) has the same configuration as the invention described in Patent Document 1, but the auxiliary winding n is connected to the auxiliary winding n. The vector sum of the induced voltage induced by the line n is 1/2 (57.5 V) with respect to the induced voltage (115 V) of the reference winding v and 180 ° with respect to the induced voltage of the reference winding v. The auxiliary winding n is configured so as to produce a phase difference of the output terminals U, V, W of the three-phase windings u, v, w. The output terminals U and W of the two windings u and w other than the reference winding v and the output terminal N of the auxiliary winding n are used as the phase output section. , A single-phase three-wire output unit, and an AC generator in which the intermediate tap T and the neutral point O provided in the reference winding v are a single-phase two-wire output unit. Application No. 2014-77886, hereinafter referred to as “prior patent application”).

JP 2006-204005 A

  In the AC generator described in the above prior patent application, as an example, in comparison between the connection of the invention described in Patent Document 1 shown in FIG. 12 and the connection described in the prior patent application shown in FIG. While the amount of auxiliary winding can be reduced by 42.5%, three-phase, single-phase three-wire, and single-phase two-wire can be output simultaneously. As an example, FIG. ), The induced voltage of each phase of u, v, and w is 115V, and the auxiliary voltage is 57.5V which is a vector sum of 1/2 with respect to the induced voltage of the reference winding v. When winding n is provided, three-phase 200V output from U, V, W terminals, single-phase three-wire 200V output from U, N, W terminals, single-phase two-wire 100V output from T, O terminals Can be obtained.

  Here, in the above-mentioned prior patent application, the configuration in which the T and O terminals are used as the output portion of the single-phase two-wire 100V is adopted, but the output of the single-phase two-wire 100V is not limited to the above position, and FIG. From the vector diagram of (B), it should be able to be obtained between the UN terminals or between the WN terminals, and the output of the single-phase two-wire 100V can be obtained between the UN terminals or the WN terminals. If it can be obtained, it is not necessary to provide the intermediate winding T and the output terminal connected to the reference winding v, and the configuration of the stator can be further simplified.

  However, when the output waveform of each inter-terminal voltage of the AC generator under development by the applicant of the present application (hereinafter referred to as “Comparative Example”) as an actual machine corresponding to the invention described in the above-mentioned prior patent application was measured, FIG. As shown in FIG. 9, the single-phase 200V voltage waveform output via the U and W terminals (see the solid line graph in FIG. 9) is a sine wave with almost no distortion. The single-phase 100V voltage waveform output via the N terminal (see the broken line graph in FIG. 9) and the single-phase 100V voltage waveform output via the W and N terminals (see the dotted line graph in FIG. 9). As for (reference), it was confirmed that both were asymmetrical in shape and distorted with respect to the sine waveform.

  Therefore, if such a distorted waveform voltage is output as a power supply voltage to a load connected to an AC generator, normal operation may be hindered depending on the type of connected load, and the load may be damaged in some cases. There is also a danger, and as it is, the output between the U-N terminals or the W-N terminals cannot be used as a single-phase two-wire output.

  Therefore, the present invention was made to further improve the above-described AC generator under development. As shown in FIG. 13A, the vector sum of the induced voltages with respect to the reference winding v is obtained. In an AC generator provided with an auxiliary winding n having a phase difference of 180 [deg.] With a phase difference of 180 [deg.], An output terminal provided on a winding of any phase (u or w) other than the reference winding v ( U or W) and an output terminal N provided between the auxiliary windings n (between U and N, or between W and N), so that a waveform close to a sine wave can be output. Thus, an object of the present invention is to provide an AC generator that can use the U, N terminal and / or the W, N terminal as a single-phase two-wire output unit.

  Hereinafter, means for solving the problem will be described together with reference numerals used in the embodiment for carrying out the invention. This code is used to clarify the correspondence between the description of the scope of claims and the description of the mode for carrying out the invention. Needless to say, it is used in a limited manner for the interpretation of the technical scope of the present invention. It is not a thing.

In order to achieve the above object, the alternator of the present invention comprises:
A pair of insertion portions (21a, 21b; 22a, 22b; 23a, 23b) provided in the element coils 21 to 23 of the three-phase windings u, v, and w are inserted into the slot 14 of the stator core 12 at a predetermined first interval P1. And the stator 10 formed by attaching the three-phase windings u, v, and w to the stator core 12 so as to form a Y connection with a phase difference of 120 ° around the neutral point O. And an AC generator configured to be able to take out a three-phase output of a predetermined voltage (200 V as an example) from between the output terminals U, V, W of the three-phase windings u, v, w,
An auxiliary winding n connected to the neutral point O is further provided;
A pair of insertion portions (31a, 31b; 32a, 32b; 33a, 33b) provided in the element coils 31 to 33 of the auxiliary winding n are inserted into the slot 14 of the stator core 12 at a predetermined second interval P2. Thus, the auxiliary winding n has a vector sum of induced voltages induced by the auxiliary winding n of any one of the three-phase windings u, v, w (V phase in the embodiment). Attached to the stator 10 so as to produce a phase difference of 1/2 with respect to the induced voltage (115V) of the reference winding v, which is a winding, and 180 ° with respect to the induced voltage of the reference winding v,
One of the other two windings u, w excluding the reference winding v among the three-phase windings u, v, w by forming the second spacing P2 narrower than the first spacing P1. The output terminal (U or W) and the output terminal N of the auxiliary winding n are a single-phase two-wire output unit that outputs a voltage that is approximately ½ the sine waveform with respect to the predetermined voltage. (Claim 1, FIG. 2, and FIGS. 11 to 13).

  In the AC generator configured as described above, it is preferable that the three-phase windings u, v, w and the auxiliary winding n are both distributed windings (claims 2, 5 and 6).

  With the configuration of the present invention described above, the following effects can be obtained in the AC generator of the present invention.

  Auxiliary winding for the first interval P1, which is the arrangement interval of the pair of insertion portions (21a, 21b / 22a, 22b / 23a, 23b) provided in the element coils 21 to 23 of the three-phase windings u, v, w By forming the second interval P2 which is the arrangement interval of the pair of insertion portions (31a, 31b / 32a, 32b / 33a, 33b) provided in the element coils 31 to 33 of the line n to be narrow, FIG. The output waveform of the voltage between the U-N output terminals and the voltage between the W-N output terminals in the circuit configuration shown in FIG. 6 can be made close to a sine waveform, and as a result, the U-N output terminal and / or the W-N output The terminal can be used as a single-phase two-wire output section, and the single-phase two-wire output can be taken out without providing an intermediate tap or intermediate output terminal for each phase winding.

  Further, in the configuration in which the second interval P2 is narrower than the first interval P1, the coil element 31 of the auxiliary winding n is compared with the case where the first interval P1 and the second interval P2 are formed at the same interval. By shortening the circumference of ~ 33, the total length of the copper wire to be used can be shortened, making it possible to reduce the overall weight and size of the generator and to reduce the cost associated with the reduction in the materials used. We were able to.

  Furthermore, by forming the second interval P2 narrower than the first interval P1, even if distributed winding is used, the auxiliary windings n of adjacent set coils are prevented from overlapping with each other, or the overlapping portion is reduced. As a result, it is possible to suppress the swelling of the coil end, to reduce the size of the entire generator, and to reduce the overlapping portion, so that the insulating paper is attached to insulate the overlapping portions from each other. The labor required for inserting the slot 14 can be reduced by reducing the number of element coils that must be inserted into one slot 14 of the stator core 12.

Explanatory drawing which showed the attachment state of the coil | winding with respect to the stator core in the alternating current generator (2nd space | interval P2 = 4 slot pitch) of Example 1. FIG. Explanatory drawing of the insertion position of the coil | winding with respect to the stator core in the alternating current generator (2nd space | interval P2 = 4 slot pitch) of Example 1. FIG. Explanatory drawing which showed the attachment state of the coil | winding with respect to the stator core in the alternating current generator (2nd space | interval P2 = 6 slot pitch) of Example 2. FIG. Explanatory drawing of the insertion position of the coil | winding with respect to the stator core in the alternating current generator (2nd space | interval P2 = 6 slot pitch) of Example 2. FIG. Explanatory drawing which showed the attachment state of the coil | winding with respect to the stator core in the alternating current generator (2nd space | interval P2 = 9 slot pitch) of a comparative example. Explanatory drawing of the insertion position of the coil | winding with respect to the stator core in the alternating current generator (2nd space | interval P2 = 9 slot pitch) of a comparative example. The graph which showed the output waveform of the voltage between UN terminals in the alternating current generator of Example 1, the voltage between OU terminals, and the voltage between ON terminals. The graph which showed the output waveform of the voltage between UN terminals in each alternating current generator of Example 1, Example 2, and a comparative example. The graph which showed the output waveform of the voltage between U-W terminals, the voltage between U-N terminals, and the voltage between W-N terminals in the alternating current generator of a comparative example. The graph which showed the output waveform of the voltage between U-N terminals, the voltage between OU terminals, and the voltage between ON terminals in the alternating current generator of a comparative example. It is explanatory drawing of a coil | winding, (A) is a three-phase coil | winding, (B) is an auxiliary | assistant coil | winding. The connection diagram of the stator in the alternating current generator of patent document 1 (corresponding to FIG. 1 of patent document 1). It is explanatory drawing of the stator in the alternating current generator of a prior patent application, (A) is a connection diagram, (B) is a vector diagram.

[Basic structure of AC generator]
As described above, the present invention relates to the improvement of the AC generator described in the above-mentioned prior patent application, which is the prior application of the applicant of the present application described with reference to FIG. The basic structure of the stator included in the generator is the same as that of the stator shown in FIG. 13A. A neutral phase O includes a U-phase winding u, a V-phase winding v, and a W-phase winding w that are three-phase windings. Are connected at one end and Y-connected with a phase difference of 120 ° in electrical angle.

  Therefore, with this configuration, the output terminal U connected to the other end of the U-phase winding u, the output terminal V connected to the other end of the V-phase winding v, and the other end of the W-phase winding w are connected. Via the output terminal W and the neutral point O, a three-phase output of a predetermined rated voltage, 200 V in this embodiment, is obtained.

  In addition to the above-described three-phase windings u, v, and w, the stator of the AC generator of the present invention includes any one of the three-phase windings u, v, and w (in this embodiment, V-phase). Is used as a reference winding, and one end of the auxiliary winding n that generates an induced voltage having a phase difference of ½ and 180 ° in the vector sum with respect to the induced voltage of the reference winding v is neutral. In addition to being connected to the point O, the output terminal N is connected to the other end of the auxiliary winding n, and the same structure as that of the stator of the AC generator introduced as the aforementioned prior patent application is provided.

  In the configuration of FIG. 13A, among the three-phase windings u, v, w, the V-phase winding v is the reference winding described above, but the windings u, U of the other phases (U-phase, W-phase) Either one of w may be used as the reference winding.

  Further, in the example of FIG. 13A, one end of a single auxiliary winding n having 1/2 the number of turns of the reference winding v is set at an electrical angle of 180 ° with respect to the reference winding v. The auxiliary winding n described above is formed by connecting to the neutral point O so as to have a phase difference. The auxiliary winding n is configured by a single winding as shown in FIG. In addition to the above, it may be configured by combining a plurality of windings, and the vector sum of the induced voltage of the entire auxiliary winding n is 1/2 with respect to the excitation voltage of the reference winding v, and Various configurations can be adopted as long as the configuration has a phase difference of 180 °.

  From the above configuration, the line voltage of each phase (voltage between the output terminals U-V, V-W, W-U) is 200 V in the illustrated configuration, and therefore the voltage of each phase is about 115 V (200 V / 200 V / V). √3)

  The voltage between the output terminal N connected to the auxiliary winding n and the neutral point O (voltage between the output terminals N and O) is 57.5 V which is 1/2 of the V-phase voltage (115 V). Therefore, the voltage between the output terminals U-N and W-N is about 100 V (57.5 V × √3).

  In the AC generator described in the prior patent application described with reference to FIG. 13 (A), the output of the single-phase two-wire 100V is sent between the intermediate tap T provided in the reference winding v and the neutral point O. Since the intermediate winding T is provided in the reference winding v, the AC generator of the present application has a single phase between the U-N terminals or the W-N terminals as will be described later. Since an output of two wires 100V is obtained, it is not necessary to provide the intermediate tap T in the reference winding v. However, the intermediate tap T may be provided also in the AC generator of the present invention.

  As shown in FIGS. 2, 4 and 6, the stator 10 of the AC generator configured as described above has the above-described three-phase windings u, v, w and auxiliary winding n with respect to the stator core 12. Are formed in a predetermined pattern.

  The above-described stator core 12 is formed in a cylindrical shape having an opening into which the rotor 40 is inserted at the center, and a slot 14 serving as a groove for inserting a winding on the inner periphery thereof, and between the slots 14. A formed tooth 15 is provided, and three-phase windings u, v, w and an auxiliary winding n are inserted into the slot 14 of the stator core 12 and attached.

  As shown in FIG. 11, the windings attached to the stator core 12 are element coils (21 to 23, 31 to 33) wound with a predetermined number of turns in all of the three-phase windings u, v, w and the auxiliary winding n. In the example of FIG. 11A, three element coils 21 to 23 are connected in series in three stages to form a set coil 20 (20a) of a three-phase winding, and FIG. In the example of 3), three element coils 31 to 33 are connected in series in three stages to constitute the set coil 30 (30a) of the auxiliary winding.

  The element coils (21 to 23, 31 to 33) constituting the set coils 20 and 30 have insertion portions (21a to 23a, 21b to 21a to 23a, 21b to 21) that are linear portions inserted into the slots 14 of the stator core 12, respectively. 23b, 31a to 33a, and 31b to 33b) are provided in pairs, and coil ends (21c to 23c, 21d to 23d, 31c to 33c, 31d to 33d) that protrude from both ends of the stator core 12 when attached to the stator core 12 are provided. ) Is provided.

  A pair of insertion portions (21a and 21b; 22a and 22b; 23a and 23b; 31a and 31b; 32a and 32b; 33a and 33b) provided in each element coil 21 to 23 and 31 to 33 of each winding, The aforementioned insertion portions (21a to 23a, 21b to 21a) are inserted into the slots 14 of the stator core 12 so as to have a predetermined interval (the first interval P1 for the three-phase winding and the second interval P2 for the auxiliary winding). 23b, 31a to 33a, 31b to 33b), a predetermined number of teeth 15 are wound around the element coils 21 to 23 and 31 to 33.

[Configuration of Generator of Comparative Example]
As described with reference to FIG. 9 in the “Problems to be Solved by the Invention” column, the output waveforms of the voltage between the U and N terminals and the voltage between the W and N terminals are asymmetrical with respect to the sine waveform. The configuration of the stator of the comparative alternator observed as the shape is shown in FIGS.

  As shown in FIGS. 5 and 6, the stator of the AC generator of the comparative example is a stator formed by attaching three-phase windings u, v, w and auxiliary winding n to the stator core 12 having 42 slots. 5, the three-phase windings u, v, and w are respectively set coil 20 (20a) in which three element coils are connected in series, and set coil 20 (20b) in which four element coils are connected in series. The four-stage set coil 20b is connected to the three-stage set coil 20a so as to be reversely wound to constitute one winding element 2, and the two winding elements 2 constitute one-phase winding. Is configured.

  In the illustrated example, the number of slots of the stator 12 is 42 slots, and four sets of set coils are accommodated in the 42 slots. Therefore, the interval between centers of adjacent set coils in one phase is 10.5 slot pitch (42 slots). ÷ 4 set coils = 10.5).

  The interval P1 between one insertion portion and the other insertion portion provided in each element coil is 9 slot pitch, and the element coils constituting one set coil 20a, 20b are shifted by one slot for each stage. It is attached with distributed winding. Since the center-to-center distance between adjacent set coils 20a and 20b in one phase is 10.5 slots as described above, the three-stage set coil 20a and the four-stage set coil 20b are inserted with two element coils. Parts are stored in the same slot.

  As described above, each of the three-phase windings u, v, w includes two winding elements 2, and each winding element 2 in one phase is 180 ° (42 slots / 2 winding elements). = 21 slots).

  The three-phase windings u, v, and w are arranged so as to be shifted by 14 slots (42 slots ÷ 3 phases = 14 slots) so that each phase has a phase difference of 120 °.

  The interval between adjacent phases is 7 slots (42 slots ÷ 2 winding elements ÷ 3 phases = 7 slots).

  In the example of FIG. 5, the auxiliary winding n includes a set coil 30a in which element coils are connected in three stages in series, and a set coil 30b in which element coils are connected in two stages in series. Two set coils 30b are connected so as to be reversely wound to constitute one winding element 3, and the two winding elements 3 constitute an auxiliary winding n.

  The interval P2 between one insertion portion and the other insertion portion provided in each element coil constituting the auxiliary winding n is 9 slot pitch, and the element coil constituting one set coil 30a, 30b is 1 It is attached with distributed windings that are shifted by one slot for each stage. Since the interval between the centers of adjacent set coils 30a and 30b in the auxiliary winding n is 10.5 slots, the three-stage set coil 30a and the two-stage set coil 30b have the same element coil insertion portion. It is stored in the slot.

  The auxiliary winding n is composed of two winding elements 3, and each winding element 3 is arranged at a position 180 degrees apart and connects the winding elements in parallel.

  The auxiliary winding n is connected to a neutral point so as to have a phase difference of 180 ° with respect to the reference winding v, but the center of the set coils 30a and 30b of the auxiliary winding n and the set coil of the reference winding v The centers of 20a and 20b coincide with each other.

  When the two winding elements 2 of each phase of the three-phase windings u, v, and w are connected in parallel, a low voltage (200 V) output voltage is obtained, and when they are connected in series, a high voltage (400 V) output voltage is obtained.

[Consideration of Comparative Example]
Here, from FIGS. 13A and 13B, the output waveform of the voltage between the U and N terminals is the waveform of the induced voltage of the U phase winding (voltage between the OU terminals) and the induction of the auxiliary winding n. In order to examine the cause of distortion in the output waveform of the voltage between the U and N terminals in the AC generator of the comparative example, it is obtained by combining with the waveform of the voltage (voltage between the O and N terminals). The voltage between the U-N terminals, the voltage between the OU terminals, and the voltage between the OU terminals in the AC generator of the comparative example were measured. The measurement results are shown in FIG.

  From the measurement results shown in FIG. 10, the waveform of the voltage between the U and N terminals (the waveform shown by the solid line in the figure) is distorted with respect to the sine waveform. The peak of the waveform of the auxiliary winding induced voltage (voltage between ON and N terminals) (the waveform shown by the dotted line in the figure) is delayed from the waveform of the voltage between the U terminals (the waveform shown by the broken line in the figure) As a result, there is a delay in the drop in the voltage waveform between the U and N terminals (the solid waveform in the figure) obtained by combining the two, and the slope of the drop swells to the right side of the page at the middle position. It can be inferred that the cause is the shape.

[Structure adopted in the present invention]
On the premise of the above consideration result for the comparative example of the alternator, the structure of the stator was reviewed in the alternator of the present invention under the following expectation.

  From the output waveform of the AC generator of the comparative example shown in FIG. 10 above, the waveform of the induced voltage (voltage between ON and N terminals) of the auxiliary winding n output as a sine wave in the AC generator of the comparative example (see FIG. 10) 10, the waveform of the voltage between the U and N terminals is changed to a sine waveform by distorting the output peak (waveform peak) and flattening the output peak (the top of the waveform) to a shape close to a rectangular wave as a whole. I anticipated that it could be modified to get closer.

  The configuration of the three-phase windings u, v, and w in the stator of the AC generator of the comparative example shown in FIGS. 5 and 6 is not changed, and a pair of insertion portions provided in each element coil of the auxiliary winding n is not changed. Only the second interval P2, which is the arrangement interval, is reduced to 4 slot pitch (6 windings) with respect to 9 slot pitch (3 windings) in the comparative example (Example 1: FIGS. 1 and 2). The voltage between the U and N terminals, the voltage between the OU terminals, and the voltage between the OU terminals were measured, and the state of each change was measured. The result is shown in FIG.

  As shown in FIG. 7, in the alternating current generator of Example 1 in which the second interval P2 is reduced to a 4-slot pitch, the comparative alternating current generator has a clean sine wave (see the dotted waveform in FIG. 10). It was confirmed that the observed waveform of the induced voltage (voltage between the ON and N terminals) of the auxiliary winding n was distorted, and the peak portion (top) of the waveform was crushed and deformed into a shape close to a rectangular wave. (See the dotted waveform in FIG. 7).

  On the other hand, it was confirmed that the distortion of the output voltage waveform between the U and N terminals, which was distorted in the AC generator of the comparative example, was improved to a shape very close to a sine waveform (the solid line in FIG. 7). See waveform).

  Further, an AC generator (Example 2) in which the second interval P2 was changed to a 6-slot pitch (5 windings) as shown in FIGS. 3 and 4 and the voltage between the U and N terminals was measured. As shown in FIG. 8, although the effect of improving the distortion was reduced in comparison with the voltage between the U and N terminals of the AC generator of Example 1, in comparison with the AC generator of the comparative example, It was confirmed that the distortion was greatly improved and approached a sine waveform.

  In the above, the observation result of the output waveform of the voltage between the U and N terminals has been described, but the output interval of the voltage between the W and N terminals is also formed by making the above-described second interval P2 narrower than the first interval P1. Similarly, it was confirmed that waveform improvement was obtained.

[Consideration of effects based on examples]
From the above results, a pair of elements provided in each element coil of the auxiliary winding n with respect to the arrangement interval (first interval P1) of the pair of insertion parts provided in each element coil of the three-phase windings u, v, w. It has been confirmed that when the arrangement interval (second interval P2) of the insertion portion is narrowed, the distortion of the output waveform of the voltage between the U-N terminals and the voltage between the W-N terminals is improved and approaches the sine waveform.

  In addition, the second interval P2 is more improved in the waveform of the first embodiment in which the second interval P2 is 4 slot pitch than in the embodiment 2 in which the second interval P2 is 6 slot pitch. It was confirmed that the output waveform of the voltage between the U and N terminals and the voltage between the W and N terminals can be made closer to a sine waveform as the width is narrowed.

  On the other hand, in the second embodiment in which the second interval P2 is 6 slot pitch, the effect of improving the waveform distortion is lower than that in the first embodiment in which the second interval P2 is 4 slot pitch. In the configuration of the second embodiment, the number of turns of each element coil of the auxiliary winding n can be reduced as compared with the configuration of the first embodiment, so that it is inserted into one slot. This is advantageous in that the amount of winding can be reduced.

  In the configurations of the first and second embodiments, not only can the output waveforms of the voltage between the U and N terminals and the voltage between the W and N terminals be improved, but the circumference of each element coil of the auxiliary winding n can be increased. By shortening the length, we were able to reduce the amount of copper wire used, and we were able to obtain the effect of reducing the weight of the AC generator and reducing the manufacturing cost associated with the decrease in the materials used.

  Further, in the configuration of the comparative example, as shown in FIGS. 5 and 6, the element coils of the auxiliary winding n of the adjacent set coils overlap with each other in the seventh slot, the 17th slot, the 28th slot, and the 38th slot. As a result of the insertion, a four-layer configuration with a maximum of four element coils inserted per slot is obtained, whereas in the AC generators of Examples 1 and 2, as shown in FIG. 2 and FIG. Furthermore, the maximum number of element coils inserted per slot is three, and the stator 10 can be reduced to a three-layer configuration, so that the coil ends are concentrated at the slot portions where the element coils are inserted in a concentrated manner. Insulation paper can be attached by reducing the number of element coils inserted per slot as well as reducing the size of the AC generator and preventing the expansion of the AC generator. Results mounting operation of the insertion portion relative to the slot is reduced, it was assumed to be obtained about the effect of improving the workability can be obtained.

2 Winding elements (three-phase winding)
3 Winding elements (auxiliary winding)
10 Stator 12 Stator core 14 Slot 15 Teeth 20, 20a, 20b Set coil (three-phase winding)
21-23 Element coil (three-phase winding)
21a-23a, 21b-23b Insertion part 21c-23c, 21d-23d Coil end 30, 30a, 30b Set coil (auxiliary winding)
31-33 Element coil (auxiliary winding)
31a to 33a, 31b to 33b Insertion portions 31c to 33c, 31d to 33d Coil end 40 Rotor u U phase winding v V phase winding (reference winding)
w W phase winding n Auxiliary winding U Output terminal (U phase)
V output terminal (phase V)
W Output terminal (W phase)
N, T2 output terminal (for auxiliary winding)
O Neutral point T Intermediate tap P1 First interval [Insertion interval (three-phase winding)]
P2 second interval [interval of insertion section (auxiliary winding)]

Claims (2)

A pair of insertion portions provided in each element coil of the three-phase winding is inserted into the stator core slot at a predetermined first interval, and the three-phase winding is inserted at a position of 120 ° centered on the neutral point. In an alternator comprising a stator formed by attaching to the stator core so as to be a Y connection of a phase difference, and configured to be able to take out a three-phase output of a predetermined voltage from between each output terminal of the three-phase winding,
An auxiliary winding connected to the neutral point is further provided,
A pair of insertion portions provided in each element coil of the auxiliary winding is inserted into the slot of the stator core at a predetermined second interval, and the auxiliary winding is induced by a vector of induced voltage induced by the auxiliary winding. The sum is 1/2 of the induced voltage of the reference winding, which is one of the three-phase windings, and a phase difference of 180 ° with respect to the induced voltage of the reference winding. Attached to the stator to produce,
The second interval is narrower than the first interval, and the output terminal of one of the other two windings excluding the reference winding and the output terminal of the auxiliary winding among the three-phase windings Is a single-phase two-wire output unit that outputs a voltage about ½ of the predetermined voltage in an output waveform close to a sine waveform .   2. The AC generator according to claim 1, wherein the three-phase winding and the auxiliary winding are both distributed windings.

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