JP2010273531A - Ac generator for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an AC generator for vehicles for maintaining high operation efficiency of the entire generator according to a request from the vehicles in a high engine rotation region. <P>SOLUTION: The AC generator 1 for vehicles has an outer rotor, and a stator 3 constituted by having a plurality of poles 30 with coils 4 wound around the same arranged. The stator 3 has right-winding coils 4A and left-winding coils 4B arranged alternately, and repeatedly. The AC generator 1 for vehicles includes a switching circuit 6 that is configured to: conduct power generation using all the coils 4 when the rotational speed of the outer rotor is lower than a prescribed rotation speed; and suspend power generation at a coil group 5B that includes coils 4 of two or more poles 30 that are adjacent to each other, and conduct power generation at the remaining coil group 5A, when the rotational speed of the outer rotor is equal to or higher than the prescribed rotational speed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vehicle AC generator configured to perform single-phase or multiple-phase AC power generation.

  For example, an automotive alternator for use in a two-wheeled vehicle or the like includes an outer rotor configured by alternately arranging a plurality of N-pole and S-pole permanent magnets in the circumferential direction, an inner rotor side of the outer rotor, and a coil. And a stator configured by arranging a plurality of wound poles in the circumferential direction. For example, when the rotor rotates by receiving a rotational driving force from an engine or the like, a magnetic field generated by an N-pole permanent magnet and a magnetic field generated by an S-pole permanent magnet are alternately and alternately opposed to a plurality of poles. As a result, AC voltage is generated in coils wound around a plurality of poles.

  Further, for example, in the output control device for a vehicle alternator disclosed in Patent Document 1, a state in which the number of turns of the armature winding is increased until a predetermined rotational speed is reached, and after the predetermined rotational speed is reached is reached. Discloses that the number of turns of the armature winding is reduced. According to this output control device, it is possible to suppress a decrease in output current due to an increase in impedance of the armature winding in the high-speed rotation range of the AC generator, and increase the output current not only in the low-speed rotation range but also in the high-speed rotation range. Can be made.

  Further, for example, in the power supply device for an internal combustion engine of Patent Document 2, the power generation coil in the magnet generator is divided into a first coil portion and a second coil portion, and the connection state of both coil portions is serially or in parallel. A configuration for switching is disclosed. In the low speed region of the internal combustion engine, both coil portions are connected in series, and in the high speed region, both coil portions are connected in parallel, so that the magnet generator can operate at high speed without sacrificing the output at low speed. A large load current can be secured in the region.

JP-A-6-292329 JP-A-10-108427

  However, Patent Documents 1 and 2 do not disclose any poles to be switched in order to change the connection state of each coil in the stator and the output characteristics. Further, in Patent Document 1, the output current of power generation can be improved in a high-speed rotation range, but when this generated power exceeds the required generated power required from the vehicle and becomes unnecessary for charging the battery, the regulator The circuit needs to be cut (discarded to ground potential). At this time, the amount of high generated power that can be obtained increases the friction (rotation resistance, etc.) for rotating the rotor, and the operating efficiency of the entire generator decreases.

  The present invention has been made in view of such conventional problems, and an automotive alternator that can maintain high operating efficiency of the entire generator in response to a request from the vehicle in a high engine speed region. It is something to be offered.

According to a first aspect of the present invention, an outer rotor formed by alternately arranging a plurality of N pole magnetic field forming portions and S pole magnetic field forming portions in the circumferential direction, and an inner rotor side of the outer rotor, And a stator in which a plurality of poles wound with a coil are arranged around the central core portion,
AC power generation for a vehicle configured to perform single-phase or multi-phase AC power generation by alternately arranging the N-pole magnetic field forming section and the S-pole magnetic field forming section to each pole. In the machine
The whole of the coil includes a right-handed coil wound in a right-handed direction while interlinking with the pole core part, and a left-handed coil wound in a left-handed direction while interlinking with the pole core part. It is arranged repeatedly alternately.
When the rotation speed of the outer rotor is less than a predetermined rotation speed, power generation is performed using all the coils. On the other hand, when the rotation speed of the outer rotor is equal to or higher than the predetermined rotation speed, An AC generator for a vehicle comprising a switching circuit configured to suspend power generation in a coil group including coils in two or more adjacent poles and perform power generation using the remaining coil group (Claim 1).

The vehicle alternator according to the present invention is devised to improve the operation efficiency of the entire generator by stopping power generation in a specific coil group when the rotation speed of the outer rotor is equal to or higher than a predetermined rotation speed. ing.
Specifically, the vehicle alternator according to the present invention includes a switching circuit that can be switched between a state where power is generated using all coils and a state where power is generated using any one of the coil groups. .
When the vehicle alternator of the present invention is operated, if the rotational speed of the outer rotor is less than a predetermined rotational speed (in the low engine speed region), power is generated using all the coils. I do. Thereby, the electric power generation value in a low rotation area | region can be ensured appropriately.

  On the other hand, when the rotational speed of the outer rotor is equal to or higher than the predetermined rotational speed (in the high engine speed region), the power generation in the coil group including the coils in two or more poles adjacent to each other is suspended and the remaining power is stopped. Electric power is generated using the coil group. At this time, since the coil group that stops power generation includes coils in two or more poles adjacent to each other, the power generation value in the high rotation region can be intentionally reduced. That is, by forming a state in which no current flows through coils in two or more poles adjacent to each other, a magnetic path that does not contribute to power generation is formed in the two or more poles. As a result, the magnetic flux contributing to power generation can be reduced, and it is possible to suppress excessive power generation beyond that required by the vehicle in a high rotation range, and friction when the outer rotor rotates (rotation resistance, etc.) Can be reduced.

  Therefore, according to the vehicular AC generator of the present invention, the operating efficiency of the entire generator can be maintained high in response to a request from the vehicle in a high engine speed region.

According to a second aspect of the invention, an outer rotor formed by alternately arranging a plurality of N pole magnetic field forming portions and S pole magnetic field forming portions in the circumferential direction, and an inner rotor side of the outer rotor, And a stator in which a plurality of poles wound with a coil are arranged around the central core portion,
AC power generation for a vehicle configured to perform single-phase or multi-phase AC power generation by alternately arranging the N-pole magnetic field forming section and the S-pole magnetic field forming section to each pole. In the machine
The whole of the coil includes a right-handed coil wound in a right-handed direction while interlinking with the pole core part, and a left-handed coil wound in a left-handed direction while interlinking with the pole core part. It is arranged repeatedly alternately.
When the rotational speed of the outer rotor is equal to or higher than a predetermined rotational speed, when the rotational speed is reduced, the power generation of the coils at the plurality of poles is performed without stopping the power generation of the coils at two or more adjacent poles. While the motor is stopped and power is generated using the remaining coils, when the rotational speed of the outer rotor is less than a predetermined rotational speed, the rotational speed is decelerated, and the rotational speed is accelerated over the entire rotational speed range. The vehicle alternator includes a switching circuit configured to generate power using all the coils when the speed is constant or at a constant speed (claim 9).

The vehicle alternator according to the present invention reduces the operation efficiency of the entire generator by stopping power generation in a specific coil group when the rotation speed of the outer rotor is equal to or higher than a predetermined rotation speed and the rotation speed is reduced. We are trying to improve it.
Specifically, the AC generator for vehicles of the present invention includes a switching circuit that can be switched between a state where power is generated using all coils and a state where power is generated using some coils.

  When the vehicle alternator according to the present invention is operated, when the rotational speed of the outer rotor is equal to or higher than a predetermined rotational speed (in the high engine speed region), when the rotational speed is decelerated, they are adjacent to each other. The power generation of the coils at the plurality of poles is stopped while the power generation of the coils at the two or more poles is not stopped, and the power generation is performed using the remaining coils. At this time, the coil group that stops power generation is a coil in a pole arranged one by one at a plurality of positions with poles that generate power on both sides (that is, all right-handed coils or many right-handed coils). Coil, or all left-handed coils or many left-handed coils.)

Thereby, it can suppress that the impedance in the whole coil increases with the increase in rotational speed. Also, in the high engine speed range, the pole where the coil through which the output current flows is placed adjacent to the pole where the coil through which the output current does not flow is adjacent to form a magnetic path that contributes to power generation at all the poles. Can do. Therefore, the generated power value of the entire coil can be increased.
At this time, the friction (rotational resistance, etc.) when rotating the outer rotor increases, but when the engine rotation is decelerated, the increase in friction is in a direction advantageous for decelerating the engine rotation. Works.

On the other hand, when the rotational speed of the outer rotor is less than the predetermined rotational speed (in the low engine speed range), when the rotational speed is decelerated, and when the rotational speed is accelerated over the entire rotational speed or at a constant speed. In some cases, all coils are used to generate electricity. As a result, the generated power value can be appropriately secured except in the specific state (deceleration when the rotational speed is equal to or higher than the predetermined rotational speed).
In the present invention, since the amount of power generation when the vehicle is decelerated can be increased, the amount of power generation during acceleration and low speed of the vehicle can also be reduced. This also makes it possible to reduce power generation loss.

  Therefore, even with the vehicular AC generator according to the present invention, the operating efficiency of the entire generator can be maintained high in response to a request from the vehicle in a high engine speed range.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view showing an automotive alternator in Embodiment 1; FIG. 3 is a graph schematically showing a state of power generation output in the vehicle AC generator in Example 1. FIG. Sectional explanatory drawing which shows the alternating current generator for vehicles in Example 1. FIG. FIG. 2 is a circuit diagram schematically showing a configuration of a switching circuit and a regulator circuit in the first embodiment. Explanatory drawing which shows the other stator in Example 1. FIG. Explanatory drawing which shows the other stator in Example 1. FIG. Explanatory drawing which shows the other stator in Example 1. FIG. Explanatory drawing which shows the other stator in Example 1. FIG. FIG. 3 is a circuit diagram schematically showing a configuration of another switching circuit in the first embodiment. Explanatory drawing which shows the stator in Example 2. FIG. FIG. 10 is an explanatory diagram showing a formation state of a U-phase continuous coil group in another stator according to the second embodiment. FIG. 6 is an explanatory diagram illustrating a formation state of a V-phase continuous coil group in another stator according to the second embodiment. FIG. 9 is an explanatory diagram illustrating a formation state of a W-phase continuous coil group in another stator according to the second embodiment. The graph which shows roughly the state of the electric power generation output in the alternating current generator for vehicles in Example 3. FIG. Explanatory drawing which shows the stator in Example 3. FIG. Explanatory drawing which shows the other stator in Example 3. FIG. Explanatory drawing which shows the other stator in Example 3. FIG. The graph which shows the change of the output current in each alternating current generator for vehicles in a confirmation test. The graph which shows the change of the friction in each vehicle AC generator in a confirmation test. Explanatory drawing which shows the change of the magnetic flux amount in the pole of an invention in the explanation of an effect numerically. Explanatory drawing which shows the change of the amount of magnetic flux in the pole of the product of an invention when the passage state of magnetic flux changes in explanation of an effect. Explanatory drawing which shows the change of the magnetic flux amount in the pole of a comparative product in description of an effect numerically. Explanatory drawing which shows the change of the magnetic flux amount in the pole of the invention product in consideration of an iron loss in explanation of an effect numerically. Explanatory drawing which shows the change of the magnetic flux amount in the pole of the product of an invention when the passage state of magnetic flux changes when the iron loss is considered in the explanation of the effect. Explanatory drawing which shows the change of the magnetic flux amount in the pole of the comparison goods at the time of considering an iron loss in description of an effect numerically. The graph which shows the difference in the output current of the invention product and comparative product which arises by generation | occurrence | production of an iron loss by taking a rotational speed on a horizontal axis and taking an output current on a vertical axis | shaft in description of an effect.

A preferred embodiment in the first and second inventions described above will be described.
In the first and second inventions, the right-handed coil and the left-handed coil indicate that the winding directions are opposite to each other, and any of them may be wound clockwise or counterclockwise.
Further, any of the vehicle alternators can be configured to charge a battery in the vehicle. In the first invention, the voltage of the battery is measured, and when the voltage value is equal to or higher than a predetermined voltage value, the switching control using the switching circuit can be performed.

In the first and second aspects of the invention, the entire coil is formed by connecting a plurality of continuous coil groups in which the coils are continuously connected via a jumper wire by winding a magnet wire. It is preferable that the power generation stoppable coil group capable of stopping the power generation is configured by any one of the continuous coil groups (claims 2 and 10).
In this case, the formation of the continuous coil group makes it easy to form the entire coil, and the above-described power generation stoptable coil group can be easily formed.
Also, the number of coil groups capable of stopping power generation can be formed in addition to one. In this case, in response to an increase in the rotational speed of the outer rotor, it is possible to increase the number of coil groups capable of halting power generation for halting power generation in a stepwise manner.

  In the first aspect of the invention, the switching circuit may be configured to generate power using the remaining continuous coil group after stopping the power generation in the all power generation state in which power generation is performed using all the coils and the coil group capable of halting power generation. The generated power value in the entire power generation state is greater than the required generated power value required from the vehicle over the entire rotational speed region of the outer rotor. In the entire rotational speed region of the outer rotor, the generated power value when generating power in the partial power generation state is smaller than the generated power value when generating power in the full power generation state, and the switching circuit is switched. The predetermined rotational speed at which the power generation is performed is a rotational speed at which the generated power value in the partial power generation state is larger than the required generated power value. Doo Preferably (claim 3).

In this case, the arrangement of a plurality of coils constituting the coil group capable of stopping power generation is appropriate, and the switching circuit can ensure the required generated power value required by the vehicle in the power generation in the AC generator for the vehicle. Can be switched to the partial power generation state to reduce the electric power cut (discarded to the ground potential) by the regulator circuit that controls the charging of the battery. Thereby, the friction which rotates a rotor can be aimed at more effectively, and the operating efficiency of the whole generator can be improved effectively.
The predetermined rotational speed at which the switching circuit performs switching may be a rotational speed with a slight margin with respect to the rotational speed at which the generated power value in the partial power generation state is greater than the required generated power value. it can.

In addition, the vehicle alternator performs single-phase power generation, and the power suspension coil group includes three or more poles arranged adjacent to each other in the circumferential direction. (Claim 4).
The vehicle alternator performs single-phase power generation, and the coil group capable of stopping power generation includes coils in two adjacent poles and one or two of the two poles. Including a coil in a pole arranged by skipping two poles in the circumferential direction, a portion where the right-handed coil and the left-handed coil are continuously connected via the connecting wire, and the right-handed coil are continuous with each other. It is also possible to provide a portion connected together.
Further, the vehicle alternator performs single-phase power generation, and in the stator, a plurality of poles constituting the power generation stoppable coil group and a plurality of remaining continuous coil groups are configured. The poles can be alternately and repeatedly arranged (claim 6).
In these cases, in the vehicular AC generator that performs single-phase power generation, it is possible to effectively reduce the friction when the outer rotor rotates in the high rotation region of the engine.

The vehicle alternator performs three-phase power generation. In the stator, a U-phase, a V-phase formed by winding a U-phase, V-phase, and W-phase coil around the pole core portion, V Phase, W-phase poles are repeatedly arranged in the same order around the central core portion, and the power generation-stoppable coil group is a plurality of U-phases arranged adjacent to each other in a circumferential direction, It can also be composed of a V-phase and W-phase pole group.
The vehicle alternator performs three-phase power generation. In the stator, a U-phase, a V-phase formed by winding a U-phase, V-phase, and W-phase coil around the pole core portion, V Phase and W phase poles are repeatedly arranged in the same order around the central core portion, and the U phase, V phase, and W phase poles that constitute the power generation haltable coil group, and the remaining continuous The U-phase, V-phase, and W-phase poles that constitute the coil group may be alternately and repeatedly arranged (claim 8).
In these cases, in the vehicular AC generator that performs three-phase power generation, it is possible to effectively reduce the friction when the outer rotor rotates in the high rotation region of the engine.

In the second aspect of the invention, the switching circuit may be configured to generate power using all of the coils in all the power generation states where power generation is performed using the coils and the remaining continuous coil group. The generated power value in the entire power generation state is greater than the required generated power value required from the vehicle over the entire rotational speed region of the outer rotor. The generated power value when generating power in the partial power generation state is smaller than the generated power value when generating power in the full power generation state when the outer rotor is less than a predetermined critical rotational speed, And when the said outer rotor is more than predetermined | prescribed critical rotational speed, it becomes larger than the electric power generation value at the time of generating electric power in the said all electric power generation state. Ri, the predetermined rotational speed which the switching circuit for switching, it is preferable that the above critical rotational speed or the rotational speed of the vicinity thereof (claim 11).
In this case, the arrangement of the plurality of coils constituting the coil group capable of stopping power generation is appropriate, and the switching circuit is equal to or higher than the critical rotational speed or the rotational speed in the vicinity thereof in power generation in the AC generator for a vehicle. In addition, when the rotational speed is reduced, the generated power value of the entire coil can be effectively increased.

The coil group capable of stopping power generation is connected to the whole of the left-handed coil through the connecting wire, or to the whole of the remaining left-handed coil except for some left-handed coils through the connecting wire. The remaining continuous coil group is formed by connecting the whole of the right-handed coil through the crossover wire, or the whole of the right-handed coil and a part of the left-handed coil through the crossover wire. And are preferably connected continuously (claim 12).
In this case, the generated power value of the entire coil can be effectively increased when the rotational speed is reduced in the high engine speed region.

Hereinafter, embodiments of a vehicle AC generator according to the present invention will be described with reference to the drawings.
Example 1
As shown in FIG. 2, the vehicle alternator 1 of this example (hereinafter simply referred to as “alternator 1”) has N pole magnetic field forming portions 22N and S pole magnetic field forming portions 22S alternately in the circumferential direction C. A plurality of outer rotors 2 arranged on the inner peripheral side of the outer rotor 2 and a plurality of poles 30 around which the coil 4 is wound around the pole core part 32. The N pole magnetic field forming section 22N and the S pole magnetic field forming section 22S are alternately arranged opposite to each pole 30 to perform single-phase AC power generation. It is.
As shown in FIG. 1, the entire coil 4 in the stator 3 is linked to the pole core portion 32 and the right-handed coil 4 </ b> A wound in the right-handed direction R in a state linked to the pole core portion 32. The left-handed coil 4B wound in the left-handed direction L is alternately and repeatedly arranged.

  And as shown in FIG. 3, when the rotational speed of the outer rotor 2 is less than the predetermined rotational speed N1, the AC generator 1 generates power using all the coils 4, while the outer rotor 2 When the rotation speed is equal to or higher than the predetermined rotation speed N1, the power generation in the coil group 5B including the coils 4 in the two or more poles 30 adjacent to each other is stopped, and the power generation is performed using the remaining coil group 5A. A configured switching circuit 6 is provided.

Below, it demonstrates in full detail with reference to FIGS. 1-10 about the alternating current generator 1 of this example.
The alternator 1 of this example is a single-phase magnet type alternator used for a two-wheeled motor vehicle. The alternator 1 generates electric power by receiving engine rotation, and the generated electric power is charged to a battery 73, lamps 74 are turned on, etc. Used to do.
As shown in FIG. 4, the outer rotor 2 is connected to the crankshaft 11 of the engine and is configured to rotate in response to the rotation of the engine. The outer rotor 2 is configured by alternately arranging permanent magnets constituting the N-pole magnetic field forming portion 22N and permanent magnets constituting the S-pole magnetic field forming portion 22S on the inner peripheral side of the cylindrical yoke 21. . The stator 3 is fixed to a housing 10 attached to an engine or the like. The central core portion 31 and the plurality of pole core portions 32 are formed using a soft magnetic iron material or the like. A bobbin made of an insulating resin is provided on the outer periphery of each pole 30, and each coil 4 is wound around the bobbin. Moreover, the magnet wire which comprises the coil 4 consists of conductors, such as a copper wire which provided the insulating film. In the figure, the axial direction of the AC generator 1 is indicated by L.

As shown in FIG. 1, the entire coil 4 of this example includes a plurality of continuous coil groups 5 (two in this example) in which the coils 4 are continuously connected to each other via a crossover wire 41 by winding a magnet wire. Is connected. In FIG. 1, FIG. 2, etc., in order to make it easy to understand, the state which wound the coil 4 is abbreviate | omitted and shown, and the crossover 41 is shown with a typical line.
The continuous coil group 5 is formed by continuously forming a plurality of coils 4 with one magnet wire. The connecting wire 41 is a portion that connects the coils 4 between the poles 30, and crosses between the poles 30 on either end face in the axial direction of the central core portion 31 and the pole core portion 32. The continuous coil groups 5 are connected to each other via a connection fitting provided on the central core portion 31 or the like (not shown).

The entire coil 4 of this example is constituted by two continuous coil groups 5, and one continuous coil group 5 forms a power generation stoppable coil group 5 </ b> B.
In FIG. 1, in the partial power generation state W2 in which the power generation in some of the coils 4 is suspended, the coil 4 (pole 30) that performs power generation is indicated by a hatched circle.
In the coil group 5B capable of stopping power generation in this example, the coil 4 in the two adjacent poles 30 and the one or two poles 30 are disposed in the circumferential direction C with respect to the two poles 30. The coil 30 includes the coil 4 in the pole 30, and has a portion where the right-handed coil 4 </ b> A and the left-handed coil 4 </ b> B are continuously connected via the crossover wire 41, and a portion where the right-handed coil 4 </ b> A is continuously connected. . The other continuous coil group 5A includes a coil 4 in two adjacent poles 30 and a pole in which one or two poles 30 are disposed in the circumferential direction C with respect to the two poles 30. 30, and includes a portion in which the right-handed coil 4 </ b> A and the left-handed coil 4 </ b> B are continuously connected via the connecting wire 41, and a portion in which the left-handed coils 4 </ b> B are continuously connected.
Here, the right-handed coil 4A and the left-handed coil 4B indicate that the winding directions are opposite to each other, and any of them may be wound clockwise or counterclockwise. In FIG. 1, the right-handed direction in the right-handed coil 4A is indicated by R, and the left-handed direction in the left-handed coil 4B is indicated by L.

FIG. 5 is a diagram for explaining the electrical configuration of the AC generator 1 and the switching circuit 6 and the regulator circuit 7 that controls charging and discharging of the generated power.
The switching circuit 6 includes a partial power generation state W2 in which the power generation state in the AC generator 1 is stopped, the power generation in the power generation stoptable coil group 5B is stopped, and power generation is performed using the other continuous coil group 5A, and two continuous coil groups 5 (all coils 4) can be switched to the all power generation state W1 in which power generation is performed.
In the stator 3 of this example, two continuous coil groups 5 are connected in series to form a single-phase coil 4. The two continuous coil groups 5 are provided on the ground potential side and always generate power. The first continuous coil group 5 </ b> A configured to perform, and the second continuous coil group 5 </ b> B (coil group 5 </ b> B capable of stopping power generation) provided on the positive side of the battery 73 and capable of stopping power generation.

  More specifically, as shown in FIGS. 1 and 5, the stator 3 of this example has 16 poles (16 pieces) of poles 30. Then, the other continuous coil group (first continuous coil group) 5A includes three right-handed coils 4A, from each of the lead wires 42A connected to the ground potential by one magnet wire, via the crossover wires 41. The right-handed coil 4A and the left-handed coil 4B that are adjacent to each other, one right-handed coil 4A, and the right-handed coil 4A and the left-handed coil 4B that are adjacent to each other are successively connected to the first continuous coil group 5A and the second It is drawn out to the intermediate connection portion 43 with the continuous coil group 5B. Further, the second continuous coil group 5B, which is the coil group 5B capable of stopping power generation, is connected to the right-handed coil 4A and the left-handed coil adjacent to each other from the intermediate connection part 43 through the crossover wires 41 by one magnet wire. 4B, the three left-handed coils 4B, the right-handed coil 4A and the left-handed coil 4B adjacent to each other, and one left-handed coil 4B are successively connected to each other, and are drawn out to a lead-out portion 42B connected to the plus side of the battery 73.

In this example, the AC generator 1, the switching circuit 6, and the regulator circuit 7 are used to configure a power generation system that charges the battery 73 and lights the lamp 74 and the like.
As shown in FIG. 5, the regulator circuit 7 includes a battery charging circuit 71 that performs control for charging the battery 73 with the electric power generated by the AC generator 1, and a lamp that lights the lamp 74 and the like with the electric power generated by the AC generator 1. And a lighting circuit 72.

The battery charging circuit 71 has a switching element 711 connected between the coil 4 and the battery 73 in the AC generator 1 and is configured to perform regulator control of the voltage of the battery 73 when the switching element 711 is turned on. Has been. The lamp lighting circuit 72 has a switching element 721 connected between the coil 4 and the lamp 74 in the AC generator 1, and performs regulator control for lighting the lamp 74 when the switching element 721 is turned on. It is configured as follows. The lamp 74 includes lamps such as a light and a speedometer. The battery 73 is connected to a load 75 such as various auxiliary machines and instruments.
The single-phase AC voltage generated by the AC generator 1 of this example uses a positive voltage for battery charging and a negative voltage for lamp lighting out of the single-phase sine wave voltage.

  The switching circuit 6 includes switching elements 61A and 61B such as thyristors provided corresponding to the first continuous coil group 5A and the second continuous coil group 5B, respectively. 61B is configured to perform switching control. The switching circuit 6 performs switching control of the switching elements 61A and 61B such as thyristors to make the first continuous coil group 5A and the second continuous coil group 5B conductive to the battery 73, and the first power generation state W1. Switching to the partial power generation state W2 in which only the continuous coil group 5A is conducted to the battery 73 is possible.

The first continuous coil group 5A and the second continuous coil group 5B are connected to the positive side of the battery 73 and the load 75 via switching elements 61A and 61B such as thyristors, respectively. The switching circuit 6 turns on the switching element 61A on the high voltage side and turns off the switching element 61B on the low voltage side to form the all power generation state W1, turns off the switching element 61A on the high voltage side and turns off the low voltage. The side switching element 61B is turned on to form the partial power generation state W2.
The switching circuit 6 is configured to operate in response to a signal from an ECU (engine control unit) 8.

FIG. 3 is a graph schematically showing the state of the power generation output in the AC generator 1 with the horizontal axis representing the rotational speed of the outer rotor 2 and the vertical axis representing the output current from the stator 3.
This figure shows the output current I1 when the full power generation state W1 is formed and the output current I2 when the partial power generation state W2 is formed in the entire rotation speed region of the outer rotor 2. Further, the required generation current Ir required from the vehicle to the AC generator 1 is also shown. Further, in the regulator circuit 7 of the AC generator 1, the battery 73 is charged with the voltage kept constant by carbon resistance or the like.

As shown in the figure, in the AC generator 1 of this example, the power generation current I1 when generating power in the entire power generation state W1 is the required power generation current required from the vehicle in the entire rotational speed region of the outer rotor 2. It is larger than Ir. Further, in the entire rotation speed region of the outer rotor 2, the generated current I2 when generating power in the partial power generation state W2 is smaller than the generated current I1 when generating power in the full power generation state W1. The predetermined rotation speed N1 at which the switching circuit 6 switches between the total power generation state W1 and the partial power generation state W2 is slightly higher than the rotation speed at which the power generation current I2 in the partial power generation state W2 is greater than the required power generation current Ir. Rotation speed with sufficient margin.
As a result, the required power generation current Ir required by the total power generation state W1 is maintained in the low engine speed range of the engine, whereas, compared with the required power generation current Ir in the partial power generation state W2 in the engine high speed range. Therefore, it is possible to limit the output of excessive generated current.
1 shows the flow of the generated current I2 in the partial power generation state W2, and FIG. 2 shows the flow of the generated current I1 in the full power generation state W1.

The power generation suspension possible coil group 5B (second continuous coil group 5B) in the stator 3 of this example can be variously arranged as long as it includes the coils 4 in two or more poles 30 adjacent to each other. Below, some other examples of composition of coil group 5B which can stop power generation are shown.
For example, as shown in FIG. 6, when 16 poles (16 pieces) of poles 30 are arranged in the stator 3, the first continuous coil group 5A, which is another continuous coil group 5A, includes three poles 30 adjacent to each other. Two locations of the coil 4 in FIG. 1, one location of the coil 4 in the two poles 30 adjacent to each other, and one location of the coil 4 in the one pole 30 can be configured by one magnet wire. In this case, the second continuous coil group 5B, which is the coil group 5B capable of stopping power generation, includes three locations of the coil 4 in the two poles 30 adjacent to each other and one location of the coil 4 in the one pole 30. It can be constituted by a single magnet wire.

7 and 8, when 20 poles (20 pieces) of poles 30 are arranged in the stator 3, the first continuous coil group 5A, which is another continuous coil group 5A, is adjacent to each other. The coils 4 in the individual (or twelve) poles 30 can be constituted by one magnet wire. In this case, in the second continuous coil group 5B, which is the coil group 5B capable of stopping power generation, the coils 4 in the seven (or eight) poles 30 adjacent to each other can be configured by one magnet wire.
The pole core portion 32 can be fitted from the axial direction with respect to the central core portion 31 in a state where the coil 4 is wound. At this time, the connecting wire 41 in the first continuous coil group 5A is arranged on one end face side in the axial direction of the central core portion 31 and the pole core portion 32, and the connecting wire 41 in the second continuous coil group 5B is arranged in the central core portion 31. The pole core portion 32 can be disposed on the other end surface side in the axial direction.

  Further, as shown in FIG. 9, when 20 poles (20 pieces) of poles 30 are arranged in the stator 3, the first continuous coil group 5A, which is another continuous coil group 5A, has three poles adjacent to each other. Four portions of the coil 4 in 30 can be configured by one magnet wire. In this case, the second continuous coil group 5B which is the coil group 5B capable of stopping power generation can be configured by one magnet wire at four locations of the coil 4 in the two poles 30 adjacent to each other. Further, in this case, in the stator 3, the three poles 30 constituting the first continuous coil group 5A and the two poles 30 constituting the second continuous coil group 5B are alternately repeated four times. Are arranged.

The alternator 1 of the present example is designed to improve the operation efficiency of the entire generator by stopping power generation in a specific coil group 5 when the rotational speed of the outer rotor 2 is equal to or higher than a predetermined rotational speed N1. It is carried out.
Specifically, the AC generator 1 includes a switching circuit 6 that can be switched between a state where power is generated using all the coils 4 and a state where power is generated using any one of the coil groups 5.
When operating the AC generator 1 of this example, if the rotational speed of the outer rotor 2 is less than the predetermined rotational speed N1 (in the low engine speed region), all the coils 4 are used. Power generation. Thereby, the electric power generation value in a low rotation area | region can be ensured appropriately.

On the other hand, when the rotational speed of the outer rotor 2 is equal to or higher than the predetermined rotational speed N1 (in the high engine speed region), the power generation stoppable coil group including the coils 4 in two or more poles 30 adjacent to each other ( Power generation in the second continuous coil group) 5B is stopped, and power generation is performed using the first continuous coil group 5A. At this time, since the power generation stoppageable coil group 5B includes the coils 4 in two or more poles 30 adjacent to each other, the generated power value in the high rotation region can be intentionally reduced. That is, by forming a state in which no current flows to the coil 4 in two or more poles 30 adjacent to each other, a magnetic path that does not contribute to power generation is formed in the two or more poles 30. As a result, the magnetic flux contributing to power generation is reduced, and it is possible to suppress excessive power generation beyond that required by the vehicle in a high rotation region, and friction (rotation resistance or the like) when the outer rotor 2 rotates. ) Can be reduced.
Therefore, according to the alternator 1 of the present example, the operating efficiency of the entire generator can be maintained high in response to a request from the vehicle in a high engine speed region.

  Further, the number of coil groups 5B capable of stopping power generation can be formed in addition to one. For example, as shown in FIG. 10, when two power generation rest possible coil groups 5B are formed and the rotational speed of the outer rotor 2 becomes equal to or higher than a first predetermined rotational speed, one power generation rest possible coil group 5B ( When the power generation in 2) is suspended and the rotational speed of the outer rotor 2 becomes equal to or higher than the second predetermined rotational speed higher than the first predetermined rotational speed, the two power generation halt capable coil groups 5B (1) The power generation in 5B (2) can be suspended. In general, the higher the rotational speed of the outer rotor 2, the higher the generated power value tends to increase. In this case, the generated power value can be kept low in accordance with the degree of excess of the generated power value. The configurations of the switching circuit 6 and the regulator circuit 7 are the same as those in FIG.

(Example 2)
This example is an example in which the structure adopted in the single-phase AC generator shown in the first embodiment is adopted in a three-phase vehicle AC generator.
In the stator 3 of the three-phase AC generator 1 of this example, as shown in FIG. 11, a U-phase, V-phase, which is formed by winding a U-phase, V-phase, and W-phase coil 4 around a pole core portion 32, W-phase poles 30 are repeatedly arranged around the central core portion 31 in the same order.

The stator 3 of this example has 18 poles (18 pieces) of poles 30, and U-phase, V-phase, and W-phase poles 30 are repeatedly arranged in the same order six times. The first continuous coil group 5A of this example includes three sets of U-phase, V-phase, and W-phase poles 30 arranged adjacent to each other in a part in the circumferential direction C. The possible coil group (second continuous coil group) 5B includes three sets of U-phase, V-phase, and W-phase poles 30 arranged adjacent to each other and collected in the remaining portion in the circumferential direction C.
Each of the first continuous coil group 5A and the second continuous coil group 5B is formed of three phases of U phase, V phase, and W phase, and the first continuous coil group 5A and second phase of each phase are formed. The continuous coil group 5B is connected in series.

Further, as shown in FIGS. 12 to 14, the stator 3 in the three-phase AC generator 1 includes U-phase, V-phase, and W-phase poles that constitute a power generation stoppable coil group (second continuous coil group) 5B. 30 and the U-phase, V-phase, and W-phase poles 30 constituting the remaining first continuous coil group 5A may be alternately and repeatedly arranged. FIG. 12 shows the formation state of the U-phase first continuous coil group 5A and the second continuous coil group 5B, and FIG. 13 shows the V-phase first continuous coil group 5A and the second continuous coil group 5B. FIG. 14 shows the formation state of the W-phase first continuous coil group 5A and the second continuous coil group 5B.
11 to 14, the right-handed direction in the U-phase right-handed coil 4A is UR, the left-handed direction in the U-phase left-handed coil 4B is UL, and the right-handed direction in the V-phase right-handed coil 4A is VR. A right-handed direction in the V-phase left-handed coil 4B is indicated by VL, a right-handed direction in the W-phase right-handed coil 4A is indicated by WR, and a left-handed direction in the W-phase left-handed coil 4B is indicated by WL.

In this example, in the three-phase AC generator 1, the friction when the outer rotor 2 rotates can be effectively reduced in the high rotation region of the engine.
Also in this example, other configurations are the same as those of the first embodiment, and the same effects as those of the first embodiment can be obtained.

(Example 3)
This example is an example in which, in a single-phase AC generator, the arrangement of the coils 4 constituting the coil group 5B capable of stopping power generation is different from that in the first embodiment, and the generated power value is improved in the high rotation region of the engine. is there.
The AC generator 1 of this example also includes a switching circuit 6 that can be switched between a state in which power generation is performed using all the coils 4 and a state in which power generation is performed using some of the coils 4. As shown in FIGS. 15 and 16, when the rotational speed of the outer rotor 2 is equal to or higher than a predetermined rotational speed N2, the switching circuit 6 is connected to two or more poles 30 adjacent to each other when the rotational speed is reduced. While the power generation of the coil 4 is not stopped, the power generation of the coil group 5B capable of stopping power generation in the plurality of poles 30 is stopped and the remaining continuous coil group 5A is used for power generation, while the rotation speed of the outer rotor 2 is predetermined. When the rotational speed is reduced when the rotational speed is less than N2 and when the rotational speed is accelerated or constant over the entire rotational speed, power is generated using all the coils 4. ing.

As shown in FIG. 15, the entire coil 4 of this example is also formed by connecting two continuous coil groups 5 in which the coils 4 are continuously connected to each other via a crossover wire 41 by winding a magnet wire. The two continuous coil groups 5 of the present example are connected in series, and are provided on the ground potential side and configured to always generate power, and provided on the positive side of the battery 73 for power generation. It consists of the 2nd continuous coil group 5B (coil group 5B which can be stopped for power generation) which enabled the rest (refer FIG. 5).
The switching circuit 6 of this example pauses the power generation in the all power generation state W1 in which power generation is performed using all the coils 4 and the power generation stoppable coil group 5B (second continuous coil group 5B), and the remaining first It is possible to switch to the partial power generation state W2 in which power generation is performed using the continuous coil group 5A.

FIG. 15 is a graph schematically showing the state of power generation output in the AC generator 1 with the horizontal axis representing the rotational speed of the outer rotor 2 and the vertical axis representing the output current from the stator 3.
This figure shows the output current I1 when the full power generation state W1 is formed and the output current I2 when the partial power generation state W2 is formed in the entire rotation speed region of the outer rotor 2. Further, the required generation current Ir required from the vehicle to the AC generator 1 is also shown. In the regulator circuit 7 of the AC generator 1, the battery 73 is charged with a constant voltage by carbon resistance or the like.

As shown in the figure, in the AC generator 1 of this example, the generated current I2 when generating power in the partial power generation state W2 is the total power generation when the outer rotor 2 is less than the predetermined critical rotational speed N2. When the power generation current I1 is smaller than the power generation current I1 when power is generated in the state W1 and the outer rotor 2 has a predetermined critical rotational speed N2 or more, the power generation current I1 when power generation is performed in the total power generation state W1. Is bigger than. The predetermined rotation speed N2 at which the switching circuit 6 switches is the critical rotation speed N2 or a rotation speed in the vicinity thereof.
Thus, the required power generation current I1 required by the total power generation state W1 is maintained in the low engine speed region, while the power generation current I2 is increased by the partial power generation state W2 in the high engine speed region. can do.

  As shown in FIG. 16, in the stator 3 of this example, all the right-handed coils 4 </ b> A are continuously formed by a single magnet wire via the connecting wire 41 to form the first continuous coil group 5 </ b> A. In addition, all the left-handed coils 4B are continuously formed by a single magnet wire via the crossover wire 41 to form the second continuous coil group 5B (coil group that can stop power generation 5B). In the stator 3, poles 30 that always generate power and poles 30 that can stop power generation are alternately arranged. The figure shows a case where 16 poles (16 pieces) of poles 30 are formed in the stator 3.

The coil group (second continuous coil group) 5B capable of stopping power generation in the stator 3 of the present example is configured such that the power generation of the coils 4 in the two or more poles 30 adjacent to each other is not paused. If a state in which power generation is suspended can be formed, various arrangements can be made. Below, some other examples of composition of coil group 5B which can stop power generation are shown.
For example, as shown in FIG. 17, when 16 poles (16 pieces) of poles 30 are arranged in the stator 3, all (eight pieces) right-handed coils 4 </ b> A are connected via the jumper wires 41 by one magnet wire. And two left-handed coils 4B are formed in succession to form a first continuous coil group 5A, and the remaining (six) left-handed coils 4B are continuously connected via the connecting wire 41 by one magnet wire. It is also possible to form the second continuous coil group 5B (the power generation stoppable coil group 5B).

  For example, as shown in FIG. 18, when 20 poles (20 pieces) of poles 30 are arranged in the stator 3, all (10 pieces) of left-handed coils are connected via a jumper wire 41 by one magnet wire. 4B and two right-handed coils 4A are formed in succession to form a first continuous coil group 5A, and the remaining (8) right-handed coils are connected via a connecting wire 41 by one magnet wire. It is also possible to form 4A continuously to form the second continuous coil group 5B (coil group that can stop power generation 5B).

The vehicle alternator 1 of the present example is configured such that when the rotational speed of the outer rotor 2 is equal to or higher than a predetermined critical rotational speed N2 and the rotational speed is decelerated, the generator is stopped by stopping power generation in the specific coil group 5B. We are trying to improve the overall driving efficiency.
When the vehicle alternator 1 of this example is operated, when the rotational speed of the outer rotor 2 is equal to or higher than the critical rotational speed N2 (in the high engine speed region), when this rotational speed is reduced, Power generation in the power generation stoppable coil group 5B is stopped and power generation is performed using the first continuous coil group 5A. At this time, the power generation stoppable coil group 5B is the coil 4 in the poles 30 arranged one by one at a plurality of locations in a state where the poles 30 that generate power are positioned on both sides (that is, the power generation stoppable coil group 5B , All left-handed coils 4B or many left-handed coils 4B, or all right-handed coils 4A or many right-handed coils 4A).

Thereby, it can suppress that the impedance in the whole coil 4 increases with the increase in rotational speed. In addition, in the high rotation region of the engine, the pole 30 in which the coil 4 through which the output current flows is disposed and the pole 30 in which the coil 4 through which the output current does not flow are adjacent to each other, and all the poles 30 contribute to the power generation. A path can be formed. Therefore, the generated power value of the entire coil 4 can be increased.
At this time, the friction (rotational resistance, etc.) when rotating the outer rotor 2 increases, but since it is when the engine rotation is decelerated, the increase in the friction is a direction advantageous for decelerating the engine rotation. Act on.

On the other hand, when the rotational speed of the outer rotor 2 is less than the predetermined rotational speed N2 (in the low engine speed range), when the rotational speed is decelerated, and when the rotational speed is accelerated over the entire rotational speed range or constant When the speed is reached, power is generated using all the coils 4 (first continuous coil group 5A and second continuous coil group 5B). As a result, the generated power value can be appropriately ensured in a state other than the specific state (deceleration when the rotation speed is equal to or higher than the predetermined rotation speed N2).
Further, in this example, since the power generation amount at the time of deceleration of the vehicle can be increased, the power generation amount at the time of acceleration and low speed of the vehicle can also be reduced. This also makes it possible to reduce power generation loss.

Therefore, even with the vehicular AC generator 1 of this example, the operating efficiency of the entire generator can be maintained high in response to a request from the vehicle in a high engine speed range.
Also in this example, the configurations of the switching circuit 6 and the regulator circuit 7 are the same as those shown in FIG. The other configurations are also the same as in the first embodiment, and the same effects as those in the first embodiment can be obtained.

Although not shown, the arrangement structure of the poles 30 in this example can also be adopted for the three-phase AC generator 1. For example, in the case of the stator 3 having 18 poles 30 in which the U-phase, V-phase, and W-phase poles 30 are repeatedly formed in the same order six times, the first U-phase pole 30 and the second set V Phase pole 30, third set of W phase pole 30, fourth set of U phase pole 30, fifth set of V phase pole 30, sixth set of W phase pole 30, It can be set as group 5B.
In this example as well, particularly in the single-phase AC generator 1, a plurality of coil groups 5B that can stop power generation are formed, and the regulator circuit 6 increases the coil group 5B that can stop power generation as the rotational speed increases. be able to.

(Confirmation test)
In the confirmation test, in the AC generator 1 shown in the first embodiment and the third embodiment, the rotation of the outer rotor 2 is performed when the full power generation state W1 is formed and when the partial power generation state W2 is formed. Changes in generated current (generated power) and changes in friction over the entire speed range were measured.
FIG. 19 is a graph showing changes in the power generation output of the AC generator 1 with the horizontal axis representing the rotational speed (rpm) of the outer rotor 2 and the vertical axis representing the output current (A) from the stator 3. In FIG. 20, the horizontal axis represents the rotational speed (rpm) of the outer rotor 2, and the vertical axis represents the friction (rotational resistance) (W) generated in the outer rotor 2. It is a graph to show.

In each AC generator 1, the output voltage from the stator 3 is constant at 14 (V).
19 and 20, the entire power generation state W1 using all 20 poles (refer to FIG. 7 etc. of the first embodiment) is pattern 1 (all power generation), and a portion by 13 poles adjacent to 7 poles 30 that do not generate power The power generation state W2 (FIG. 7 of the first embodiment) is pattern 2 (partial power generation 1), and the partial power generation state W2 (FIG. 8 of the first embodiment) is formed by pattern 12 (partial power generation 1) with 12 poles adjacent to eight poles 30 that do not generate power. 1) Partial power generation state W2 (FIG. 9 of Example 1) in which two poles 30 that do not generate power and three poles 30 that generate power are alternately arranged in pattern 4 (partial power generation 1), and two or more poles 30 that do not generate power A state (FIG. 18 of the third embodiment) in which the poles 30 that do not generate power in the non-adjacent state are formed is a pattern 5 (partial power generation 2).
19 and 20, it can be seen that both the output current and the friction increase as the rotational speed of the outer rotor 2 increases. It can be seen that if the rotational speed is increased, the output current can be increased while the friction is also increased.

In FIG. 19, in the total power generation state W1 (pattern 1), the output current I1 is set to be larger than the required power generation current Ir from the vehicle in the region of the total rotational speed. On the other hand, in the partial power generation state W2 (patterns 2 to 4) shown in the first embodiment, it can be seen that the output current I2 is larger than the required power generation current Ir when the rotational speed is in a range of about 2000 (rpm) or more. If a portion where the output current is higher than the required power generation current Ir is cut by the regulator circuit 7 due to a request from the vehicle, the loss is reduced if the output current is not too higher than the required power generation current Ir. , The increase in friction can be suppressed.
Therefore, in the AC generator 1 having the 20-pole stator 3 shown in the first embodiment, the entire power generation state W1 is switched to the partial power generation state W2 in a range of slightly higher rotational speed than 2000 (rpm). Thus, it is understood that the increase in friction can be suppressed and the operation efficiency of the entire generator can be increased.

Further, the output current I2 in the case of the partial power generation state W2 (pattern 5) shown in the third embodiment is an output current in the case of the total power generation state W1 (pattern 1) in the range where the rotational speed is about 3400 (rpm) or more. It can be seen that it is larger than I1. If it is better to obtain the output current higher than the required power generation current Ir in order to improve the charging speed of the battery 73 according to the request from the vehicle, it is better to increase the output current. .
Therefore, in the alternator 1 having the 20-pole stator 3 shown in the third embodiment, when the vehicle is decelerating, in the rotational speed region higher than about 3400 (rpm), the total power generation state W1 It can be seen that by switching from the partial power generation state W2 to the partial power generation state W2, the total power generation value of the coil 4 can be increased, and the operation efficiency of the entire generator can be increased. In this case, the increase in friction does not cause a problem because it acts in a direction advantageous for decelerating the rotation of the engine.

(Explanation of the effect of the invention)
In the following, the stator 3 having eight poles 30 is taken as an example while comparing the excellent effects of the single-phase AC generator (invention product) shown in the first and second embodiments with the comparative product. I will explain.
In the invention and the comparative product, when partial power generation is performed, power generation is stopped for the same number of poles 30. In the description of this effect, when the power generation in the coil group 4B including the coils 4 in the two or more poles 30 adjacent to each other is stopped and power generation is performed using the remaining coil group 4A (invention product), The reason why the power generation amount can be effectively reduced will be described using specific numerical values.
FIG. 21 shows that when power generation is stopped at four poles 30 adjacent to each other among the eight poles 30 and power is generated by the remaining four poles 30, It is a figure which shows the change of the magnetic flux amount when a magnetic flux passes to the pole 30 adjacent to this by a numerical value. Here, the pole 30 that generates power is indicated by a hatched circle. Further, when power generation is performed at the pole 30, it is assumed that 1/5 of the magnetic flux amount is converted into power generation (current) and used.

  In the figure, when the amount of magnetic flux entering any one of the poles 30 is 100, when 20 magnetic fluxes are converted into power generation (current) and used in any one of the poles 30, 80 magnetic fluxes are I will get out of that pole 30. When the amount of 80 magnetic flux enters the pole 30 adjacent to one of the poles 30 and the amount of 16 magnetic flux is converted into power generation (current) and used, 64 amount of magnetic flux exits from the adjacent pole 30. It will be. At this time, the same amount of magnetic flux is also used for power generation in one of the other poles 30 and the pole 30 adjacent thereto, and the amount of magnetic flux used for power generation in the entire stator 3 is 20 × 2 + 16 ×. 2 = 72. That is, power generation for 72 magnetic flux amounts is performed.

  Moreover, FIG. 22 is a figure which shows the change of the amount of magnetic flux by the numerical value when the state of the magnetic flux which passes the pole 30 changes with rotation of the outer rotor 2 about the invention of FIG. In this case, in three poles 30, 20 magnetic flux amounts are converted into power generation and used, and in one pole 30, 16 magnetic flux amounts are converted into power generation and used. The amount of magnetic flux used for power generation in the entire stator 3 is 20 × 3 + 16 × 1 = 76. That is, power generation for the amount of magnetic flux of 76 is performed.

  On the other hand, FIG. 23 shows that, for the comparative product, when power generation is stopped at a total of four poles 30 every other one of the eight poles 30, and power is generated by the remaining four poles 30, It is a figure which shows the change of the magnetic flux amount when a magnetic flux passes from the pole 30 adjacent to this to any pole 30 by a numerical value. Here, the pole 30 that generates power is indicated by a hatched circle. Further, when power generation is performed at the pole 30, it is assumed that 1/5 of the magnetic flux amount is converted into power generation (current) and used.

In the figure, when the amount of magnetic flux entering any one of the poles 30 is 100, when 20 magnetic fluxes are converted into power generation (current) and used in any one of the poles 30, 80 magnetic fluxes are I will get out of that pole 30. Then, the 80 magnetic flux enters the pole 30 adjacent to one of the poles 30 and the 80 magnetic flux exits the adjacent pole 30 as it is without being used for power generation. Also, in any of the other three sets of poles 30 and the poles 30 adjacent thereto, the same amount of magnetic flux is used for power generation, and the amount of magnetic flux used for power generation in the entire stator 3 is 20 × 4 = 80. That is, power generation for 80 magnetic flux amounts is performed.
Further, even when the state of the magnetic flux passing through the pole 30 is changed by the rotation of the outer rotor 2 as in the case of FIG. 22, the amount of magnetic flux used for power generation in the entire stator 3 is 20 × 4 = 80. Become.

Thus, in the invention, when partial power generation is performed, power generation is performed for the amount of magnetic flux of (72 + 76) / 2 = 74, whereas in the comparative product, power generation is performed for the amount of magnetic flux of 80. Therefore, the amount of power generated by the invention can be reduced compared to the comparative product.
Therefore, in the single-phase AC generators shown in the first and second embodiments, the power generation in the coil group 4B including the coils 4 in the two or more poles 30 adjacent to each other is suspended and the remaining coil group 4A is used. When power generation is performed, the magnetic flux contributing to power generation is reduced, and it is possible to suppress excessive power generation beyond that required by the vehicle in a high rotation region, and friction when the outer rotor 2 rotates. It turns out that (rotation resistance etc.) can be reduced.

Moreover, the iron loss in the central core part 31 increases as the rotational speed increases. And according to the invention, it will be shown below that the amount of decrease in the amount of power generation can be increased by increasing the iron loss as the rotational speed increases.
Here, when the magnetic flux passes from one of the poles 30 to the adjacent pole 30 when the rotational speed is increased, the magnetic flux passing through the central core portion 31 has an amount of 20 of iron loss. Assuming that decreases.

  FIG. 24 shows a case in which iron loss is considered when the rotational speed is high in the invention of FIG. In FIG. 24, when the magnetic flux passes from one of the poles 30 to the adjacent pole 30, when the amount of magnetic flux of 20 decreases in the central core portion 31 as iron loss, the adjacent pole 30 has 60 magnetic fluxes. An amount of 12 magnetic fluxes, which is 1/5 of that amount, is used for power generation. Therefore, the amount of magnetic flux used for power generation in the entire stator 3 is 20 × 2 + 12 × 2 = 64, and power generation for 64 magnetic flux amounts is performed.

  Moreover, FIG. 25 shows the case where the iron loss when the rotational speed becomes high in the invention of FIG. 22 is considered. In FIG. 25, when the magnetic flux passes from one of the poles 30 to the pole 30 adjacent thereto, when the amount of magnetic flux of 20 decreases in the central core portion 31 as iron loss, the adjacent pole 30 has 80 or 60 The amount of magnetic flux of 16 or 12 that is 1/5 of that amount is used for power generation. Therefore, the amount of magnetic flux used for power generation in the entire stator 3 is 20 × 2 + 16 × 1 + 12 × 1 = 68, and power generation for 68 magnetic flux amounts is performed.

  On the other hand, FIG. 26 shows a case where the iron loss in the case where the rotational speed becomes high is taken into consideration in the comparative product of FIG. In FIG. 26, when a magnetic flux passes from one pole 30 to an adjacent pole 30, even when the amount of magnetic flux 20 in the central core portion 31 is reduced as iron loss, power is generated in the adjacent pole 30. As a result, the amount of magnetic flux used for power generation in the entire stator 3 is 20 × 4 = 80, and the power generation amount is the same as when there is no iron loss in the central core portion 31.

Thus, when the iron loss generated in the central core portion 31 is taken into account, when performing partial power generation, the amount of power generated by the invention can be further reduced as compared with the comparative product.
As shown in FIG. 27, the iron loss in the central core portion 31 increases as the rotational speed increases, and the output current in the stator 3 decreases with the output current IA of the invention product compared with the output current IB of the comparison product. The width increases. Therefore, according to the product of the invention, the amount of power generation can be reduced as the rotational speed increases. As the rotational speed increases, it is possible to effectively suppress excessive power generation beyond that required by the vehicle, and to effectively reduce friction (rotational resistance or the like) when the outer rotor 2 rotates. I understand that I can do it.

DESCRIPTION OF SYMBOLS 1 AC generator 2 Outer rotor 22N N pole magnetic field formation part 22S S pole magnetic field formation part 3 Stator 30 Pole 31 Central core part 32 Pole core part 4 Coil 4A Right-handed coil 4B Left-handed coil 41 Crossover wire 5 Continuous coil group 5A 1st 1 continuous coil group 5B Coil group capable of stopping power generation (second continuous coil group)
6 Switching circuit 7 Regulator circuit 73 Battery 74 Lamp 75 Load C Circumferential direction R Right-handed direction L Left-handed direction W1 Total power generation state W2 Partial power generation state

Claims (12)

An outer rotor formed by alternately arranging a plurality of N pole magnetic field forming portions and S pole magnetic field forming portions in the circumferential direction, and an inner rotor side of the outer rotor, and winding a coil around the pole core portion A stator having a plurality of poles arranged around the central core portion;
AC power generation for a vehicle configured to perform single-phase or multi-phase AC power generation by alternately arranging the N-pole magnetic field forming section and the S-pole magnetic field forming section to each pole. In the machine
The whole of the coil includes a right-handed coil wound in a right-handed direction while interlinking with the pole core part, and a left-handed coil wound in a left-handed direction while interlinking with the pole core part. It is arranged repeatedly alternately.
When the rotation speed of the outer rotor is less than a predetermined rotation speed, power generation is performed using all the coils. On the other hand, when the rotation speed of the outer rotor is equal to or higher than the predetermined rotation speed, An AC generator for a vehicle comprising a switching circuit configured to stop power generation in a coil group including coils in two or more adjacent poles and generate power using the remaining coil group. In claim 1, the whole of the coil is formed by connecting a plurality of continuous coil groups in which the coils are continuously connected to each other via a crossover by winding a magnet wire,
An AC generator for a vehicle, wherein any one of the plurality of continuous coil groups constitutes a coil group capable of halting power generation. The switching circuit according to claim 2, wherein the switching circuit is a part that generates power using all the coils, and generates power using the remaining continuous coil group after stopping power generation in the coil group capable of stopping power generation. Switchable to power generation state,
In the entire rotation speed region of the outer rotor, the generated power value in the all power generation state is larger than the required generated power value required from the vehicle,
In the entire rotational speed region of the outer rotor, the generated power value when generating power in the partial power generation state is smaller than the generated power value when generating power in the full power generation state,
The vehicle alternator according to claim 1, wherein the predetermined rotational speed at which the switching circuit performs switching is a rotational speed at which a generated power value in the partial power generation state is larger than the required generated power value. In Claim 2 or 3, the above-mentioned vehicle alternator performs single-phase power generation,
2. The vehicle alternator according to claim 1, wherein the coil group capable of stopping power generation comprises three or more poles arranged adjacent to each other in a circumferential direction. In Claim 2 or 3, the above-mentioned vehicle alternator performs single-phase power generation,
The power generation stoppable coil group includes a coil in two poles adjacent to each other, and a coil in a pole in which one or two poles are disposed in a circumferential direction with respect to the two poles, A vehicular AC generator comprising: a portion in which the right-handed coil and the left-handed coil are continuously connected via a jumper; and a portion in which the right-handed coils are continuously connected to each other. . In Claim 2 or 3, the above-mentioned vehicle alternator performs single-phase power generation,
In the stator, a plurality of poles constituting the power generation-stoppable coil group and a plurality of poles constituting the remaining continuous coil group are alternately and repeatedly arranged. Machine. In Claim 2 or 3, the above-mentioned vehicle alternator performs three-phase power generation,
In the stator, U-phase, V-phase, and W-phase poles formed by winding U-phase, V-phase, and W-phase coils around the pole core portion are repeatedly arranged in the same order around the central core portion. Has been
The vehicular AC generator includes a plurality of U-phase, V-phase, and W-phase pole groups arranged adjacent to each other in a circumferential direction so as to be adjacent to each other. In Claim 2 or 3, the above-mentioned vehicle alternator performs three-phase power generation,
In the stator, U-phase, V-phase, and W-phase poles formed by winding U-phase, V-phase, and W-phase coils around the pole core portion are repeatedly arranged in the same order around the central core portion. Has been
In addition, the U-phase, V-phase, and W-phase poles that constitute the coil group capable of stopping power generation, and the U-phase, V-phase, and W-phase poles that constitute the remaining continuous coil group are alternately repeated. An AC generator for a vehicle characterized by being arranged. An outer rotor formed by alternately arranging a plurality of N pole magnetic field forming portions and S pole magnetic field forming portions in the circumferential direction, and an inner rotor side of the outer rotor, and winding a coil around the pole core portion A stator having a plurality of poles arranged around the central core portion;
AC power generation for a vehicle configured to perform single-phase or multi-phase AC power generation by alternately arranging the N-pole magnetic field forming section and the S-pole magnetic field forming section to each pole. In the machine
The whole of the coil includes a right-handed coil wound in a right-handed direction while interlinking with the pole core part, and a left-handed coil wound in a left-handed direction while interlinking with the pole core part. It is arranged repeatedly alternately.
When the rotational speed of the outer rotor is equal to or higher than a predetermined rotational speed, when the rotational speed is reduced, the power generation of the coils at the plurality of poles is performed without stopping the power generation of the coils at two or more adjacent poles. While the motor is stopped and power is generated using the remaining coils, when the rotational speed of the outer rotor is less than a predetermined rotational speed, the rotational speed is decelerated, and the rotational speed is accelerated over the entire rotational speed range. A vehicle alternator comprising a switching circuit configured to generate power using all the coils when the motor is operated or at a constant speed. In claim 9, the whole of the coil is formed by connecting a plurality of continuous coil groups in which the coils are continuously connected to each other through a crossover by winding a magnet wire,
An AC generator for a vehicle, wherein any one of the plurality of continuous coil groups constitutes a coil group capable of halting power generation. The switching circuit according to claim 10, wherein the switching circuit is a part that generates power using all the coils, and generates power using the remaining continuous coil group after stopping power generation in the coil group capable of stopping power generation. Switchable to power generation state,
In the entire rotation speed region of the outer rotor, the generated power value in the all power generation state is larger than the required generated power value required from the vehicle,
The generated power value when generating power in the partial power generation state is smaller than the generated power value when generating power in the full power generation state when the outer rotor is less than a predetermined critical rotational speed. And, when the outer rotor is equal to or higher than a predetermined critical rotational speed, it is larger than the generated power value when generating power in the all power generation state,
The vehicle alternator according to claim 1, wherein the predetermined rotational speed at which the switching circuit performs switching is the critical rotational speed or a rotational speed in the vicinity thereof.   12. The power generation stoppable coil group according to claim 10 or 11, wherein the entire left-handed coil is connected to the entire left-handed coil via the connecting wire, or the entire remaining left-handed coil excluding some left-handed coils via the connecting wire. Are connected continuously, and the remaining continuous coil group is connected to the whole of the right-handed coil via the connecting wire or to the whole of the right-handed coil via the connecting wire. An AC generator for a vehicle, wherein the left-handed coil of a portion is continuously connected.

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