JP2010136459A - Ac rotating electrical machine for vehicles - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an AC generator for vehicle which is excellent in cooling efficiency, keeping its resistance value small. <P>SOLUTION: This AC generator for vehicle has a stator 4 of concentrated winding structure, in which stator winding 5 is wound continuously on one stator magnetic pole 17, and a rotor 3, which is disposed opposite the stator 4 via a gap and has a plurality of claw-shaped magnetic poles 13. The rotor 3 has a cooling fan 7, which rotates synchronously with rotation, and the stator 4 has a joint which electrically connects with the stator winding 5, and the joint end is arranged at the axial end of the stator 4 so that cooling air generated by the cooling fan 7 may blow against it. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cooling method for an AC rotating electrical machine for a vehicle.

  As a prior art, Patent Document 1 discloses a structure in which cooling air is generated by a fan provided on a shaft end face of a rotor in a motor configured by concentrated winding, and the air is cooled by flowing the air between the coils. Patent Document 2 discloses a structure in which a single fan is used to cool the coil by flowing air in the gap between the coils as in Document 1, and a fan is used in combination with an external fan to increase the cooling effect.

JP 2006-20490 A JP 2004-274800 A

  Concentrated winding is a winding method effective in reducing the resistance value because the coil end length can be shortened. However, since the coil end is short and a cooling effect using the coil end cannot be expected, it is considered that cooling is promoted by passing air between the stator windings. However, in order to build a wind passage, the space factor of the winding cannot be increased, and the space factor of the winding and the cooling performance are in a trade-off relationship. For this reason, there is a problem that the resistance value becomes large in order to pass the wind.

  Accordingly, an object of the present invention is to provide a vehicular AC generator with good cooling efficiency while keeping the resistance value small.

  In the present invention, the main cooling means is not cooled by flowing air between the windings, but a connecting plate electrically connected in the axial direction from the winding portion is provided, and the connecting plate is used as a cooling plate. The cooling of the wire is promoted.

  According to the present invention, the stator winding is configured in parallel connection so that the space factor of the winding portion can be increased and the resistance value can be reduced, and the connection plate for electrically connecting the parallel connection is provided. As a cooling plate, the resistance value is reduced, and a compact stator winding cooling means can be provided without using a new cooling plate for cooling. can do.

  An embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 shows an AC rotating electrical machine 100 for a vehicle according to an embodiment of the present invention.

  The rotor 3 has a claw-shaped magnetic pole 13 at the center of the shaft and a field winding 12 at the center thereof, and a pulley 1 is attached to the tip of the shaft, and the field winding 12 on the opposite side. It is comprised from the slip ring 9 for supplying with electricity. Further, a front fan 7F and a rear fan 7R of cooling fans that rotate in synchronization with the rotation are provided on both end faces of the claw-shaped magnetic pole 13 of the rotor 3. Further, between the claw magnetic poles, the permanent magnet 16 plays a role of auxiliary excitation for increasing the field winding magnetic flux. On the other hand, the stator 4 is composed of a stator magnetic pole 17 and a stator winding 5, and is arranged to face the rotor 3 with a slight gap. The stator 4 is held by a front bracket 14 and a rear bracket 15, and both the bracket and the rotor 3 are rotatably supported by bearings 2F and 2R. The slip ring 9 described above is in contact with the brush 8 and can supply power. The stator winding 5 is composed of a three-phase winding, the neutral point is connected to a neutral point connecting plate 20 provided on the pulley side, and the lead wire of each coil is connected to the connecting plate 21 of each phase. Once connected, the rectifier circuit 11 is connected to a lead wire from each phase connecting plate 21. The rectifier circuit 11 is composed of a rectifier element such as a diode, and constitutes a full-wave rectifier circuit. For example, in the case of a diode, the cathode terminal is connected to the terminal 6. Further, the anode side terminal is electrically connected to the vehicle AC rotating electrical machine main body. The rear cover 10 serves as a protective cover for the rectifier circuit 11.

  Next, the power generation operation will be described. An engine (not shown) and an AC rotating electrical machine for a vehicle are generally connected by a belt. The AC rotating electrical machine for a vehicle is connected to the engine side by a belt with a pulley 1, and the rotor 3 rotates as the engine rotates. When a current flows through the field winding 12 provided at the center of the claw-shaped magnetic pole 13 of the rotor 3, the claw-shaped magnetic pole 13 is magnetized and rotated to induce three-phase induction in the stator winding 5. Generate electromotive force. The voltage is full-wave rectified by the rectifier circuit 11 described above to generate a DC voltage. The positive side of the DC voltage is connected to the terminal 6 and further connected to a battery (not shown). Although details are omitted, the field current is controlled so that the DC voltage after rectification becomes a voltage suitable for charging the battery.

  A neutral point connecting plate 20 and each phase connecting plate 21 connected from the stator winding 5 are disposed on the outer diameter side of the front fan 7F and the rear fan 7R which are the cooling fans. Since the neutral point connection plate 20 and each phase connection plate 21 are configured in a ring shape, the fan wind is sucked from the axial direction and then the gap between the neutral point connection plate 20 and the phase connection plate 21. It is blown out in the outer diameter direction. However, since there is no wind interference with the coil end and the ventilation resistance does not change, the wind noise can be reduced.

  The configuration of the stator 4 will be described in detail with reference to FIG. The stator 4 is provided with a stator magnetic pole 17 facing the center. One stator winding 5 is wound around the stator magnetic pole 17 with respect to one stator magnetic pole 17. As shown in the figure, the stator winding 5 is divided into three phases and connected according to the electrical phase. In the case of this figure, 10 stator windings 5 are connected in parallel in the in-phase winding. Other phase windings having a phase difference of 120 degrees in electrical angle with this winding are similarly connected in parallel. The neutral points of these windings are electrically connected by a neutral point connecting plate 20 in the axial direction of the stator winding 5. The connecting portion is made by welding, caulking soldering, etc., and the neutral point connecting plate 20 has a low electric resistance such as a copper plate or aluminum in order to provide a function as a cooling plate in addition to electrically connecting the windings. Use things. Further, the neutral point connecting plate 20 has a ring shape as illustrated. Furthermore, it may be fixed to the upper part of the coil end of the stator winding 5. In this case, it is desirable to insulate the neutral point connection plate 20 so that the contact surface between the neutral point connection plate 20 and the stator winding 5 can be prevented from being electrically short-circuited. Further, fins may be provided so as to promote the cooling effect. Further, on the side opposite to the neutral point connecting plate 20, the lead wire of the stator winding 5 of each phase electrically connects each phase U phase connecting plate 21U, V phase connecting plate 21V, W phase connecting plate. It is provided at 21W. In the stator winding 5, windings of the same phase in electrical angle are connected to the connecting plates of each phase so that the windings of each phase are connected in parallel. Each phase connecting plate in this case also has a function as a heat radiating plate that can promote cooling of the winding as well as electrical connection. Since each phase connecting plate is configured in a ring shape, lead wires can be provided anywhere in the circumferential direction so as to match the position where the rectifier diode is arranged, so that the wiring crosses over the coil end so far There is no need for it. In this figure, for example, two W-phase lead wires 22W are provided in close proximity, but when considering the current balance of each phase connecting plate, it is desirable that the mechanical angle be 180 degrees as much as possible.

  As described above, the neutral point connecting plate 20, the U-phase connecting plate 21U, the V-phase connecting plate 21V, and the W-phase connecting plate 21W have the same potential, and the heat of the stator winding 5 is axially transmitted. It has a function to cool the drawer. Further, each connecting plate is formed in a ring shape, and the flow of wind generated by the rotation of the front fan 7F and the rear fan 7R provided in the rotor 3 can be passed uniformly. For this reason, noise of the order due to the number of stator magnetic poles does not occur. Similarly to the neutral point connection plate 20, each phase connection plate 21 is composed of a copper plate or an aluminum plate having a low electrical resistance and good heat conduction. The neutral point connection plate 21 and each phase connection plate 21 are defined as follows. The pulley side and the non-pulley side are arranged separately. As a result, cooling from both sides becomes possible, and the cooling efficiency can be improved. Moreover, a cooling effect can be heightened by providing the fin which can accelerate | stimulate a cooling effect, and the hole which can increase a cooling area in both connection plates.

  FIG. 3 shows a parallel connection diagram of the stator windings 5 described above. A configuration in which all in-phase windings are connected in parallel is adopted. Thus, the effectiveness of connecting the stator windings of each phase in parallel will be described.

  First, as a first effect, the U-phase winding is composed of U1 to U10 windings in this figure. For example, in this figure, if the U10 winding is disconnected for some reason, the remaining Power generation is possible with these nine windings. For example, in the case of a general winding configured by connecting U-phase windings in series, if a break occurs in one winding, power generation in the U-phase winding stops, so power generation The function as a machine may stop. However, in the case of parallel connection, sharing of the current flowing through the remaining windings increases, but there is an effect that the power generation function can be maintained.

  As a second effect, in the case of the series winding, when the number of windings is 3 turns, the number of series windings is 30 turns when the number of in-phase windings is 10. When the number of windings is 4 turns, the number of series turns is 40 turns and the turn ratio is 1.3 times. In a conventional 12V automotive AC rotating electrical machine composed of distributed windings, the number of turns per magnetic pole is determined from the magnitude of the generated current between 3 and 6 turns in terms of Y connection from the relationship of battery voltage. Therefore, since the number of turns that can be selected is an integer, △ connection is adopted as 3, 4, 5, 6 and from among 3.46, 4.04, 4.62, 5.2, and 5.77 in terms of Y connection. There were restrictions that had to be chosen. However, when all the windings employed in this embodiment are connected in parallel, when the number of turns wound on one magnetic pole is 30 turns, this corresponds to 3 turns in terms of Y connection, and the number of turns is 29 turns. Thus, the number of turns in terms of Y connection can be designed to 2.9 turns. Therefore, in this embodiment, in the winding system constituted by concentrated windings of 20 poles and 30 slots, the winding specification for every 0.1 turn can be selected, and the choice of winding design is greatly improved.

  This is shown in FIG. In FIG. 4, the horizontal axis represents the rotational speed and the vertical axis represents the generated current. For example, an example of the state of the generated current with respect to the number of turns of A to E when the generated current indicated by the star shown in the figure is the required value is shown. For example, in the case of an E waveform composed of 5 turns of Y connection, the target current I1 is cleared at the low-speed N1 rotation, but at the high-speed N2 rotation, the number of turns is large, so the increase in inductance increases the generated current. Is low. Moreover, in the curve of B in the case of four turns with Y connection, the current at the N2 rotational speed clears the target value, but the number of windings is small, so the power generation current at the low speed N1 rotational speed is insufficient. become. Therefore, in the conventional case, when adopting 8 turns of Δ connection, which is an intermediate number of turns between 4 turns and 5 turns in terms of Y connection, it can be 4.62 turns in terms of Y connection. It can be a curve. However, in this case, the current at the low speed side N1 rotation speed is cleared, but a slight current shortage occurs at the high speed side N2. In this way, by adopting all parallel windings shown this time for windings that cannot be selected by Y connection and △ tangent, the winding specifications as shown in the curve of C matched to the required value of generated current are selected become able to.

  In the above description, only the characteristics at the time of power generation have been mentioned, but the motor characteristics are also required in the rotating electrical machine for a vehicle because the engine is also started at the time of idling stop. Therefore, it is necessary to set the number of turns suitable for both the motor characteristics and the power generation characteristics, and the conventional winding method can only select discrete turns. By adopting the proposed all-parallel method, it is possible to select a winding with a high degree of freedom.

  The third effect will be described with reference to FIG. With the concentrated winding adopted this time, the number of turns of 0.5 turns can be set by setting the neutral point to the pulley side and the connecting plate of the phase to the non-pulley side. In combination with all the parallel windings shown this time, it is possible to select the number of turns every 0.05 turns. Thus, the design can be simplified because the number of windings closest to the required performance can be set.

  The fourth effect will be described with reference to FIG. This time, by making the stator winding 5 a fully parallel winding, the wire diameter of one coil can be reduced. Therefore, when the stator winding is directly wound around the stator magnetic pole, the slot opening width can be reduced. The dotted line in FIG. 6 schematically shows the distribution of the magnetic flux density at the center of the gap when the magnetic circuit on the rotor side is uniform. In this way, there is a difference in the fluctuation width of the magnetic flux density when the slot opening is wide and narrow. When the slot opening is narrow, the fluctuation range is small, so that the fluctuation of the force received by the stator is also small. As a result, electromagnetic noise caused by the number of slots called magnetic sound can be reduced. Although not shown in the figure, eddy current loss generated in the winding also has an effect that can be reduced by adopting a thin line.

  FIG. 7 shows a configuration in which an axial fan 7A is used as the front fan on the pulley side and a centrifugal fan is used on the non-pulley side. The front fan 7A has 11 blades and blades arranged at unequal pitches. The number of 11 is adopted because it does not coincide with the number of rotor poles, the number of stators, etc., and the blade pitch is not made uniform, so that the order of the 11th order component can be softened to the wind noise. It is. The fan on the side opposite to the pulley is a centrifugal fan, and the blade pitches are unequal. For example, when the rotor 3 rotates in the direction shown in the drawing, wind indicated by an arrow is generated. The front fan 7A is larger than the outer diameter of the rotor and has a configuration in which blades are disposed in the vicinity of the stator winding 5, and the cooling air flows through the gap between the windings toward the side opposite to the pulley. It is like that. Further, since the fan on the side opposite to the pulley is a centrifugal fan, the wind from the axial direction is blown out in the outer peripheral direction by rotation. Since the front fan 7A is on the inner peripheral side of the neutral point connecting plate 20, the neutral point connecting plate 20 can be simultaneously cooled by rotation. Although not shown, if the neutral point connecting plate 20 is extended in the axial direction, it can be used also as a wind guide, so that further cooling can be improved. In the second embodiment shown in FIG. 7, each phase connecting plate arranged on the side opposite to the pulley is configured in a trumpet shape. Thus, since the direction of the wind can be changed and the cooling area can be expanded, a good cooling effect can be expected. Although not shown, the cooling area can be increased by making a hole in the trumpet-shaped plate or using a mesh-like metal.

  Next, the shape of the fan of the rotor 3 will be described in detail. Each fan shown in FIG. 7 has the structure shown in FIG. As described above, the front fan 7A is larger than the outer diameter of the rotor 3, and the blade surface is disposed at a position substantially equal to the diameter of the stator winding. Since the permanent magnet 16 is disposed between the claw magnetic poles of the rotor 3, it is difficult to pass air between the claw magnetic poles. When the stator winding is wound at a high density and there is no gap through which the wind passes, the neutral point connecting plate 20 is cooled at the same time as playing the wind on the coil end surface. The rear fan 7R has a centrifugal fan structure in which a plurality of fins 7Rb are provided on a disk-shaped base plate 7Ra substantially equal to the outer diameter of the rotor. The base plate 7Ra is provided so that the wind flow generated by the fins 7Rb of the front fan 7A and the rear fan 7R does not interfere. As a result, it is possible to reduce wind noise due to interference between the two winds.

  FIG. 9 shows the claw magnetic pole shape of the rotor. The vehicular rotating electrical machine of this embodiment has a function of performing motor operation when starting the engine and operating as a generator after starting the engine. For that purpose, it is necessary to arrange a permanent magnet between the claw magnetic poles to realize an increase in output torque and generated current. Regarding the type of magnet, a ferrite magnet or a neodymium magnet is determined based on required performance. Further, when an excessive impact is applied to the permanent magnet 16, there is a possibility that cracking or chipping may occur, so that the outer peripheral side of the permanent magnet 16 is surrounded by a magnet cover 27. The permanent magnet 16 covered with the magnet cover 27 is inserted along the groove processing portion 25 provided on the side surface of the claw magnetic pole. The magnet cover 27 is provided with two claw portions 27a and 27b on the inner circumferential side, and the claw portions can be positioned in the gap between the magnet holding portion 26 on the opposite side of the magnet holding portion 26 after insertion. It is like that. With respect to the radial thickness of the permanent magnet 16, the thickness of the magnet holding portion 26 can be left in the claw magnetic pole so that the strength of the portion where the maximum stress is generated does not decrease, and the claw width W1 on the outer diameter side and the claw width on the inner diameter side. W2 can be secured with the same width.

  Next, fixing of the stator 4 and the bracket will be described with reference to FIG. Stepped portions are provided at both shaft end portions on the outer diameter side of the stator 4. The stepped portion 23 is provided for positioning with the bracket, and the axial length is determined in units of the thickness of the thin steel plate of the stator 4. The abutting surfaces of the bracket and the stator 4 are fixed at the portion with the longest axial length of the stator 4, and are assembled with a gap between the outermost bracket and the stator 4. During the power generation operation, the stator 4 is subjected to force fluctuations in the radial direction from the claw-shaped magnetic poles 13N and 13S provided on the rotor 3. At that time, the stator 4 is deformed in the radial direction and the axial direction, and the vibration is transmitted to the bracket due to the deformation, which is a source of noise. This time, in order to make it difficult for vibration due to the deformation to be transmitted to the bracket, a gap is provided in the fitting portion between the bracket and the stator as described above. Further, a stepped portion 23 having a length corresponding to the main gap length is provided on the inner peripheral surface corresponding to the stepped portion provided on the outermost periphery of the stator on the gap surface of the rotor 3 and the stator 4, and the stator It is designed to be resistant to fluctuations in the force at the end. Thereby, the vibration transmitted to the bracket can be reduced and the generation of noise can be suppressed low.

  FIG. 11 shows an embodiment in which the stator winding is configured by another method. In this case as well, the stator winding is the same as the concentrated winding, and the number of turns per magnetic pole is reduced by connecting the windings in the same phase in series. In the drawing, the number of turns per magnetic pole is 3 turns, and a front view from the pulley side is shown. Since the configuration is the same as described above, detailed description thereof is omitted. As the rotating part, the rotor 3 rotates in the CW direction around the shaft and the front fan 7A, which is an axial fan, rotates, so that the cooling air passes through the gap between the stator windings 5 so that The outer diameter is constituted by the positional relationship of turning on the end coil surface of the stator winding 5. In the rotor 3, a permanent magnet 16 is provided between the claw-shaped magnetic pole 13N excited to the N pole, the 13S excited to the S pole, and the claw magnetic pole. Therefore, since it is difficult for the wind to pass between the claw-shaped magnetic poles, as described above, the cooling air of the front fan 7A is cooled by the swirling air between the stator windings 5 or the winding surface. It is an effective means.

  FIG. 12 is a view showing a connecting portion of the winding shown in FIG. The stator winding 5 is connected to loop each magnetic pole on the side opposite to the pulley so that the windings of each phase are connected in series. Also, lead wires and neutral points (not shown) for each phase of the three-phase winding are provided. FIG. 13 shows an enlarged view of the connection portion of the stator winding 5. In the stator winding 5 of the present embodiment, U-shaped electric wires are inserted into one pole from the pulley side in three stages in the radial direction, and the windings having the same center length are defined as upper and lower windings. Connecting. Also, a continuous series winding is constructed by bending the longer wire in the circumferential direction and connecting it to the in-phase winding with wires of different U-shaped legs inserted on the outer diameter side and inner diameter side. be able to.

  In this case, regarding each connection, the first connection part 51 and the second connection part 52 shown in FIG. In production, the first connection portion 51 and the second connection portion 52 are first fixed by welding, and then the third connection portion is formed so as to straddle the first connection portion 51 and the second connection portion 52 in the axial direction of the connection portion. The crossing portion is configured by 53. By this connection method, the interference of the coil end portion can be reduced and the length of the coil end portion can be shortened as much as possible. As a result, the coil ends of the upper and lower two windings out of the three windings wound around one magnetic pole jump out as connecting portions in the axial direction and are cooled by a rear fan 7R provided on the rotor.

  FIG. 14 shows another embodiment of concentrated winding in which the number of rotor poles is 20 and the number of stator magnetic poles 17 is 24. In FIG. The electrical phases of the stator magnetic poles 17 are arranged at intervals of 150 degrees. As a result, for example, if the winding direction of the stator winding indicated by No. 2 is reversed with respect to the No. 1 stator winding, the phase difference of 30 degrees in electrical angle with respect to the No. 1 winding results. Can be given. Therefore, in the first winding group composed of odd-numbered windings and the second winding group composed of even-numbered windings, windings that are electrically in phase with each other are connected in parallel. The ones connected by a three-phase star connection are shown. The first winding and the second winding are each rectified by a rectifier bridge 31 and connected on the DC side by a three-phase star connection with independent neutral points. A battery 30 is connected to the direct current side. In the figure, a dot is shown in the winding, but this dot indicates the winding direction, and those showing the same direction have the winding wound in the same direction. In the case of this figure, since there are two independent neutral points, two neutral point connecting plates 20 are required. In addition, since two three-phase windings are required independently, a total of eight connecting plates are required.

  FIG. 15 shows a case where a three-phase star connection is configured by connecting the first winding and the second winding having a phase difference of 30 degrees in electrical angle in series with 20 poles and 24 slots described above. is there. In this case, the rectifying element has three phases, but two connecting plates are necessary for the U phase, two for the V phase, two for the W phase, and a total of seven neutral point connecting plates 20.

  This is shown in FIG. Since other configurations are the same as the previous configurations, detailed description thereof will be omitted. Phase connection plates 21U1, 21V1, and 21W1 are disposed on the pulley side, and neutral point connection plates and connection plates 21U2, 21V2, and 21W2 are disposed on the non-pulley side in the axial direction. In this way, in the case of wiring that uses a large number of connecting plates, a good cooling effect can be obtained by using a centrifugal fan as the pulley-side front fan.

  Moreover, as shown in FIG. 17, the number of connecting plates can be reduced by connecting each winding in series in units of two and connecting them with connecting plates. Although the star connection is shown in the figure, the neutral point connecting plate 20 can be omitted by using the Δ connection. △ The good connection is because the waveform of the phase voltage becomes the line voltage as it is, and when it is composed of the concentrated winding magnetic pole combination that the phase voltage waveform becomes trapezoidal, there is an effect of reducing the ripple of the line voltage . Therefore, the current ripple can be reduced by using the Δ connection, and the noise order can be reduced by full-wave rectification.

  FIG. 18 shows a configuration diagram in the case of Δ tangent. Since the other configuration is the configuration described so far, the description regarding the configuration is omitted. As shown in the figure, the connection plate 21 for each phase is provided on the side opposite to the pulley by connecting with a Δ connection, so that no connection plate is required on the pulley side. As a result, the front fan 7F has a configuration in which the fan blade direction of the fan is reversed from the centrifugal fan shown in FIG. The effect of improving the sex can be expected.

  FIG. 19 shows the configuration of the rotor 3 used in this embodiment. The rotor 3 is provided with a front fan 7A and a rear fan 7R. The front fan 7A is composed of an axial fan, and is composed of blades such that cooling air flows in the direction indicated by the arrow by rotation of the rotor. Therefore, a groove 105 is provided obliquely on the surface of the claw pole with respect to the rotation axis so that the cooling air flowing along with the rotation can easily flow on the surface of the claw pole. Since the shape and number of grooves affect the performance, they are determined from the balance between cooling performance and electrical output performance. The cooling air flows along the groove 105 from the pulley side to the non-pulley side.

  FIG. 20 shows a configuration in which cooling promotion fins 19 that can promote cooling of the stator winding 5 are provided in the upper part of the coil end in addition to the phase connection plate 21 and the neutral point connection plate 20 described so far. The cooling promotion fins 19 are made of aluminum or copper having high thermal conductivity, and are arranged at the end of the coil end via the thermal conductive resin 18. The cooling promotion fin 19 is provided with a plurality of fins, which are arranged as separate members on the inner diameter side of the neutral point connecting plate 20 in this figure. A front fan 7F is provided so as to apply cooling air to the fins. Although the neutral point connection plate 20 and the cooling promotion fin 19 are separated from each other this time, the cooling promotion fin 19 may be integrated as the neutral point connection plate 20. In addition, as shown in the figure, the inclination of the fin is not inclined to the center of the axis, but to the central axis of the fin so that the cooling air can easily pass through the wind generated as the rotor rotates. It is slightly tilted in the direction opposite to the rotation direction of the rotor.

  FIG. 21 shows a case where the cooling promotion fin 19 is provided at the coil end on the pulley side. The cooling promotion fins 19 are disposed at the portion where the front bracket 14 and the stator winding 5 are in contact via the heat conductive resin 18. Since the heat conductive resin 18 becomes a vibration buffer material, it is possible to prevent a decrease in reliability due to vibration and to promote cooling by heat conduction.

  The last embodiment will be described with reference to FIG. In the embodiment described so far, the phase connecting plate 21 and the neutral point connecting plate 20 have been shown to be mainly cooled by cooling air. In FIG. 22, the neutral point connecting plate 20 and the phase connecting plate 21 including the stator winding 5 are hardened with a resin having a high thermal conductivity, and the heat generated in the stator winding 5 is passed through the heat conductive resin 18 to the stator. 4 shows a structure for transmitting to a cooling water channel 110 provided on the outer peripheral portion of No. 4. The main structure is not different from the air-cooled structure, and only a cooling water channel 110 is provided on the outer periphery of the stator. In the case of the water cooling type, it is not necessary to provide a fan in the rotor 3, but the cooling effect of the rotor 3 is improved by providing it. As a result, the decrease in the field current is reduced and the generated current at the time of warming is increased.

  According to the present embodiment, in the AC rotary electric machine for a vehicle having a concentrated winding structure capable of reducing the resistance of the stator winding, the connection plate capable of transferring heat in the axial direction is provided against the deterioration of the cooling performance of the coil end. This has the effect of improving the cooling efficiency.

Sectional drawing of the axial direction which shows the rotary electric machine for air-cooling type vehicles. The perspective view which shows the structure of a stator. Connection diagram of stator windings. The graph which shows the relationship between rotation speed and generated electric current. The figure explaining the extraction position of a stator winding | coil. The schematic diagram explaining the magnetic flux density waveform of the gap with respect to the slot opening part width | variety of a stator. The perspective view and side view which combined the stator and the rotor. The perspective view which showed the whole rotor. The perspective view which showed one claw-shaped magnetic pole shape. The fragmentary sectional view of a rotor and a stator. The front view seen from the pulley side of a rotor and a stator. The perspective view which connected the stator winding in series. The perspective view explaining the connection at the time of connecting a stator winding in series. Connection diagram 1 of windings having a phase difference of 30 degrees in electrical angle. Connection diagram 2 of windings having a phase difference of 30 degrees in electrical angle. Sectional drawing of the axial direction which shows the rotary electric machine for air-cooling type vehicles. Connection diagram 3 of windings having a phase difference of 30 degrees in electrical angle. Sectional drawing of the axial direction which shows the rotary electric machine for air-cooling type vehicles. The perspective view which provided the groove | channel in the claw magnetic pole surface of a rotor. The perspective view which provided the cooling promotion fan in the edge part of a stator winding | coil. Sectional drawing of the axial direction which shows the rotary electric machine for air-cooling type vehicles. Sectional drawing of the axial direction which shows the water-cooled vehicle rotary electric machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 Rotor 4 Stator 5 Stator winding 7F Front fan 7R Rear fan 17 Stator magnetic pole 20 Neutral point connection plate 21 Phase connection plate 100 AC rotary electric machine for vehicles

Claims (15)

A stator having a concentrated winding structure in which a stator winding is continuously wound around one stator magnetic pole;
A rotor having a plurality of claw-shaped magnetic poles arranged opposite to the stator via a gap,
The rotor has a cooling fan that rotates in synchronization with rotation,
The stator has a connection portion that is electrically connected to the stator winding,
The connecting portion is an AC rotating electrical machine for a vehicle that is disposed at an axial end portion of the stator so that the cooling air generated by the cooling fan hits the connecting portion. The AC rotating electrical machine for a vehicle according to claim 1,
The connecting portion includes a neutral point connecting portion on one side of the rotor, and each phase connecting portion on the other side, and each phase connecting portion is arranged in parallel in the axial direction. . The AC rotating electrical machine for a vehicle according to claim 1,
The connecting portion is an AC rotating electrical machine for a vehicle that is a phase connecting plate that electrically connects windings having the same phase in electrical angle to connect the phase windings of the stator winding in parallel. In the vehicle AC rotating electrical machine according to claim 3,
Each of the phase connecting plates is an AC rotating electrical machine for a vehicle in which a lead wire of the stator winding is provided. In the vehicle AC rotating electrical machine according to claim 3,
Each of the phase connecting plates has a structure having a function of changing the direction of cooling air. The AC rotating electrical machine for a vehicle according to claim 1,
The cooling fan provided in the rotor is an AC rotating electrical machine for vehicles, one side of which is an axial fan that generates wind between the stator windings and the other side is a centrifugal fan. The AC rotating electrical machine for a vehicle according to claim 6,
The centrifugal fan includes a base plate provided with a plurality of fins, and the outer diameter of the base plate is substantially equal to the outer diameter of the rotor. The AC rotating electrical machine for a vehicle according to claim 1,
The rotor is provided with a groove processing portion on a side surface of the claw-shaped magnetic pole, and a permanent magnet whose outer periphery is covered with a magnet cover between the claw-shaped magnetic poles is disposed along the groove processing portion,
A magnet holding part is provided on the inner peripheral side of the claw-shaped magnetic pole,
A claw portion is provided on the inner peripheral side of the magnet cover,
An AC rotating electrical machine for a vehicle in which the permanent magnet can be positioned by the claw portion and the magnet holding portion. In the vehicle AC rotating electrical machine according to claim 8,
The magnet cover is a vehicular AC rotating electric machine configured by bending a non-magnetic thin plate. The AC rotating electrical machine for a vehicle according to claim 1,
The stator magnetic pole is a vehicular AC rotating electric machine having stepped portions on an inner peripheral side and an outer peripheral side of an axial end face. The AC rotating electrical machine for a vehicle according to claim 1,
The stator winding is composed of the number of poles and the number of slots that can realize an electrical phase of 30 degrees with the adjacent stator magnetic pole,
The first winding group having an electrical angle of 120 degrees and 240 degrees with respect to the reference magnetic pole and the second winding group having a phase difference of 30 degrees with respect to the reference magnetic pole are independent of each other. An AC rotating electrical machine for a vehicle that constitutes phase windings and each winding is connected in parallel. The AC rotating electrical machine for a vehicle according to claim 1,
The claw-shaped magnetic pole of the rotor is a vehicular AC rotating electric machine in which a groove portion is provided on the surface so that air generated by a cooling fan can easily flow along the surface of the claw magnetic pole. The AC rotating electrical machine for a vehicle according to claim 1,
An AC rotating electrical machine for a vehicle in which a cooling promotion fin is provided on an axial end surface of the stator winding. The AC rotating electrical machine for a vehicle according to claim 13,
The cooling promotion fin is composed of aluminum or copper having high thermal conductivity, and is fixed to the axial end surface of the stator winding via a resin having good thermal conductivity,
The cooling acceleration fin is inclined to be arranged in a direction in which the flow of wind is smooth according to the rotation direction of the cooling fan. A rotor composed of a plurality of claw-shaped magnetic poles;
A stator having a concentrated winding structure in which a stator winding is continuously wound around one stator magnetic pole;
A water channel provided on the outer periphery of the stator magnetic pole,
The axial end of the stator has a connection portion that is electrically connected to the stator winding,
An AC rotating electrical machine for a vehicle in which the stator winding and the connecting portion are integrally hardened with a heat conductive resin.

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