JP2639096B2 - Stator for magnet generator - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a stator for a magnet generator mounted on an internal combustion engine or the like.

[Prior art] As a stator of a magnet generator attached to an internal combustion engine,
As shown in FIG. 6, a large number of salient poles 2a
Stator core 3 with ~ 2h protruding and salient pole 2a of stator core
The coils 4a to 4h wound around 2h to 2h, respectively, are used. In the example shown in FIG. 6, at least a portion of the iron core 3 around which the coil is wound is covered with an insulating coating 5 as shown in FIG. 7, and the coil is wound directly on this coating.

When it is necessary to drive a plurality of loads by this type of generator, a plurality of single-phase armature windings are constituted by coils wound around salient poles of the stator core, and the plurality of single-phase Connect the load to each child winding. In a multi-pole magnet generator, in order to obtain a predetermined voltage, an armature winding having a multi-coil configuration is often formed by connecting a plurality of coils in series.

In the example shown in FIG. 6, among the coils 4a to 4h, the coil 4a
To 4d are connected in series to form an exciter coil (single-phase armature winding) We for driving an ignition circuit I for an internal combustion engine,
The coils 4e and 4f are connected in series to form a single-phase armature winding WL for driving a general load L such as a headlamp. The coil 4g and 4h are connected in series is constituted armature windings WB for battery charging, the armature winding WB are used to charge the battery B through the diode D _0.

As described above, when a single-phase armature winding We, WL, WB, or the like having a multi-coil configuration is configured by coils wound around a star-shaped annular core, conventionally, a predetermined number of protrusions sequentially arranged in the circumferential direction are used. Each armature winding was configured by continuously winding a coil around the pole.

By the way, in the magnet generator using the star-shaped annular stator core as described above, the alternating phases of the magnetic fluxes of the adjacent salient poles generally differ by 180 degrees. Therefore, in order to obtain a single-phase output by a coil continuously wound on adjacent salient poles, it is necessary to change the winding direction of the coil wound on adjacent salient poles. In the example shown in FIG. 6, the coils 4a, 4
c, 4e and 4g are wound left-handed and coils 4b, 4d, 4f and 4h
Is wound clockwise.

More specifically, when configuring an exciter coil, the coil 4a is wound left-hand around the salient pole 2a, and then the coil conductor is passed over the adjacent salient pole 4b, and the coil 4b is wound right around the salient pole 4b. Wrap around. After winding the coil 4b, the coil conductor is passed over the salient pole 2c, the coil 4c is wound leftward around the salient pole 2c, and then the coil 4d is wound rightward around the salient pole 2d.
In this case, the winding start end of the coil 4a and the winding end end of the coil 4d are the output terminals t1 and t2 of the exciter coil, respectively.
Becomes

Similarly, the coils 4e and 4f are wound left and right, respectively, and the start of winding of the coil 4e and the end of winding of the coil 4f are output terminals t3 and t of the general load armature winding WL, respectively.
It becomes 4.

Also, coils 4g and 4h are wound left and right,
The start of winding of the coil 4g and the end of winding of the coil 4h are output terminals t5 and t6 of the battery charging armature winding, respectively.

In this specification, the winding direction of the coil is represented by the winding direction when the magnetic pole surface of each salient pole is viewed from the front.
In FIG. 6, a right-handed arrow or a left-handed arrow is attached to the side of the magnetic pole surface of the salient pole around which each coil is wound. The right-handed arrow indicates that the winding direction of the coil is right-handed. Indicating that
A left-handed arrow indicates that the coil is left-handed.

In the case where the winding directions of the coils 4a to 4h are alternately changed as described above, the crossover conductor 6 that extends over the adjacent coil windings is the seventh conductor.
As shown in the figure, it crosses the gap between adjacent salient poles obliquely.

The stator is mounted on the engine by, for example, screwing a bolt inserted into a mounting hole 7 provided in the yoke portion 1 into a mounting portion provided on a case or the like of the engine.
A cylindrical magnetic pole surface provided at the tip of ~ 2h is opposed to a magnetic pole of a magnet rotor attached to a rotating shaft of the engine.

[Problems to be Solved by the Invention] When the stator shown in FIG. 6 is mounted on an engine, the yoke portion 1 of the iron core is fixed to the mounting portion and restrained.
Since 2a to 2h are not restrained, salient poles 2a to 2h
2h mainly oscillates with a considerable amplitude in the axial direction of the stator (the direction indicated by the arrow in FIG. 7). In this case, the amplitude and the phase of the vibration of each part are not constant, and the amplitude and the phase of the vibration are different between the one end side and the other end side in the axial direction of the iron core. Therefore, if the crossover conductor passing between the coils crosses the gap between the salient poles obliquely and passes from one end to the other end in the axial direction of the iron core, the amplitude and phase of the vibration at both ends of the crossover conductor differ. Tension acts on the transition conductor.

For example, in FIG. 7, the amplitude and phase of the vibration are different between the end 6a on the coil 4a side and the end 6b on the coil 4b side of the transition conductor 6 extending from the coil 4a to the coil 4b, and tension is applied to the transition conductor 6. I do.

Generally, the winding operation of the coil around the iron core 3 is automatically performed using a winding machine. However, when the winding operation is performed while passing the coil conductor by the winding machine, it is difficult to loosen the transition conductor. In this case, each of the crossover conductors crosses between the coils with no margin. Therefore, when tension is applied to each transition conductor by vibration, excessive force is applied to each transition conductor,
Disconnections often occur in a short time. Especially when the coil is wound using a very thin coil conductor such as an exciter coil, or when the stator is attached to an internal combustion engine that vibrates violently such as an internal combustion engine for racing,
Disconnection of the crossover conductor was likely to be a problem due to vibration.

SUMMARY OF THE INVENTION An object of the present invention is to provide a stator for a magnet generator capable of preventing disconnection of a transition conductor.

[Means for Solving the Problems] The present invention provides a stator core having a large number (usually four or more) of salient poles protruding radially outward or inward from an annular yoke portion; A stator for a magnet generator including a plurality of single-phase armature windings formed by coils wound around salient poles of an iron core. Here, it is assumed that at least one of the plurality of single-phase armature windings is a multi-coil armature winding in which coils wound around a plurality of salient poles are connected in series.

According to the present invention, in a stator as described above, an excessive force is not applied to a crossover conductor passing between coils, and in the present invention, a single-phase electric motor having a multi-coil configuration connected to the same load is provided. A plurality of coils constituting a child winding are wound continuously on a plurality of salient poles having alternating phases of magnetic flux in the same winding direction. Further, in the present invention, the crossover conductor that passes between the coils of the plurality of coils that are continuously wound passes around the outer periphery of the yoke at the same axial end side of the iron core.

When there is a single-phase armature winding of a multi-coil configuration wound by a thin coil conductor and a single-phase armature winding of a multi-coil configuration wound by a thick coil conductor, it is wound by a thick coil conductor. In the armature winding, disconnection of the transition conductor may not be a problem. For windings that require a particularly high voltage, such as an exciter coil that drives an ignition device, use a coil conductor with a smaller wire diameter than other armature windings (for example, a conductor with a wire diameter of 0.12 to 0.15 mmφ). It is necessary to wind many turns of the coil. In a coil using such a thin coil conductor, disconnection of the transition conductor due to vibration tends to be a problem. On the other hand, since the armature winding for a general load for driving a lighting load or the like is usually wound using a thick coil conductor, cutting the crossover conductor due to vibration does not cause much problem.

In such a case, only a plurality of coils constituting a single-phase armature winding of a multi-coil configuration wound by a coil conductor having a small wire diameter are respectively wound around a plurality of salient poles having alternating phases of magnetic flux. The windings may be continuously wound in the same direction, and the other single-phase armature winding may be wound in the same structure as in the related art. Also in this case, the crossover conductor passing between the coils of a plurality of coils that are wound continuously with the winding directions aligned with a plurality of salient poles having the same alternating phase of the magnetic flux is a yoke at the same axial end of the iron core. Over the periphery of the

In order to fix the stator to a predetermined mounting portion, mounting holes are usually provided in the annular yoke portion. However, if the radial size of the annular yoke portion is small, symmetrical among many salient poles The two salient poles at the positions are vacant salient poles where the coil is not wound, and mounting holes are provided in these vacant salient poles, and the coils are wound around the salient poles other than the vacant salient poles.

In the case where the mounting holes are provided in the empty salient poles and the empty salient poles are fixed as described above, the restraint that acts on the salient poles around which the coil is wound as compared with the case where the annular yoke portion is fixed. The force is inevitably weakened, and the salient poles around which each coil is wound are placed in a state where they are easily vibrated. Therefore, the present invention is particularly useful in such a case.

When two empty salient poles are provided, a stator core having usually six or more salient poles is used to secure salient poles for winding the coil.

[Operation] As described above, when a single-phase armature winding having a multi-coil configuration is formed by continuously winding a coil with the winding directions aligned with salient poles having the same alternating phase of the magnetic flux, The bridging conductor can be located at the same axial end of the yoke. Therefore, tension does not act on each of the crossover conductors due to the vibration of the salient poles of the stator in the axial direction, and the risk of disconnection of each of the crossover conductors due to the vibration can be eliminated.

When the stator is mounted on the mounting portion of the engine, the yoke portion of the iron core is fixed to the mounting portion and constrained, so that the yoke portion is less likely to vibrate than the salient pole portion. Therefore, as described above, when each of the transition conductors is passed along the vicinity of the outer peripheral portion of the yoke portion of the iron core, each of the transition conductors can be prevented from vibrating greatly, and each transition conductor is large. Breakage of the crossover conductor can be more effectively prevented in combination with the absence of the tension.

Embodiment An embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 and FIG. 2 show an embodiment of the present invention.
FIG. 1 is a front view, and FIG. 2 is a view for explaining a winding direction of a coil. In FIG. 1, reference numeral 13 denotes a stator core formed by projecting a large number (eight in this example) of salient poles 12a to 12h from the outer periphery of the annular yoke portion 11. The stator core is punched into a predetermined shape. It is constituted by laminating a predetermined number of steel plates.

The coils 14a to 14h are respectively wound around the salient poles 12a to 12h alternately in different winding directions, and are combined with a predetermined coil to form a multi-coil single-phase armature winding We, WL, WB.
Is configured. An insulating coating 15 is applied to a portion where the core coil is wound.

More specifically, in the present embodiment, the coils 14a, 14c, 14e, and 14g are sequentially applied to every other salient poles 12a, 12c, 12e, and 12g.
Are continuously wound left-handed to form an exciter coil We. The start of winding of the coil 14a and the end of winding of the coil 14g are output terminals t1 and t2 of the exciter coil We, respectively. The transition conductor 16 extending between the coils 14a, 14c, 14e, and 14g is located on one axial end face side of the iron core (the back side of the paper in the illustrated example).
Crosses the vicinity of the outer periphery of the yoke section 11.

Further, the coils 14h and 14b are continuously wound clockwise around the salient poles 12h and 12b, respectively, to form an armature winding WL for a general load, and the winding start of the coil 14h and the winding end of the coil 14b are respectively set at the armature windings. Output terminals t3 and t4 of WL. Further, coils 14d and 14f are respectively attached to salient poles 12d and 12f.
Are continuously wound right-handed, and these coils 14d and 14f
Constitutes an armature winding WB for battery charging, and the start of winding of the coil 14d and the end of winding of the coil 14f are output terminals of the armature winding WB. A transition conductor 16 'passing between the coils 14h and 14b and a transition conductor 16' passing between the coils 14d and 14f cross the vicinity of the outer periphery of the yoke portion 11 on the other axial end face side (the front side of the drawing sheet) of the iron core 13. ing.

The stator is fixed to a mounting portion provided in a case or the like of an internal combustion engine by a bolt inserted into a mounting hole 17 provided in the yoke portion 11.

With the above-described configuration, the respective transition conductors of the first coil group and the second coil group pass between the coils on the same side of the yoke portion of the iron core. The tension does not work. Also, since the yoke portion of the iron core is fixed to the engine and is less likely to vibrate than the salient pole portion, as described above, if the crossover conductor crosses the outer periphery of the yoke portion, Vibration can be suppressed. Therefore, with the configuration described above, it is possible to prevent an accident in which the transition conductor is disconnected due to vibration.

Each single-phase armature winding is connected to an ignition circuit, for example, as shown in FIG. In the figure, IG denotes an ignition coil, P denotes an ignition plug attached to a cylinder of the engine and is connected to a secondary coil of the ignition coil, C denotes a capacitor provided on the primary side of the ignition coil, and Th denotes a state when the conduction is established. A thyristor D1 is provided to discharge the electric charge of the capacitor C to the primary coil of the ignition coil, and D1 is a diode provided between the capacitor C and an exciter coil We composed of coils 14a, 14c, 14e and 14g.

This ignition circuit is known as a capacitor discharge ignition circuit. In this circuit, the capacitor C is charged to the polarity shown by the output of one half cycle of the exciter coil. Next, thyristor T
When a trigger signal is given to the gate of h, the thyristor Th
Is conducted, and the electric charge of the capacitor C is discharged through the thyristor Th and the primary coil of the ignition coil. As a result, a large change in magnetic flux occurs in the ignition coil, and a high voltage is induced in the secondary coil of the ignition coil. This high voltage is applied to the spark plug P
, A spark is generated in the spark plug, and the engine is ignited.

In the above example, one exciter coil is constituted by the coils 14a, 14c, 14e, and 14g. However, when the capacitor C is charged by one exciter coil, the exciter coil is caused by the armature reaction at a high speed of the engine. The output voltage of the capacitor may decrease and the charging voltage of the capacitor may become insufficient, and the ignition performance may decrease. In such a case, a low-speed exciter coil that has a large number of turns and induces a high voltage at a low speed of the engine and a high-speed exciter coil that has a small number of turns and induces a high voltage at a high speed of the engine are provided.

FIG. 4 shows an example in which the present invention is applied to a case where a low-speed exciter coil and a high-speed exciter coil are provided. In this example, the coils 14a, 14c, and 14e are continuously wound in the same winding direction. Exciter coil for low speed by We
1 and one coil 14g constitutes a high-speed exciter coil We2.

One end of the low-speed exciter coil We1 on the non-ground side is connected to the anode of the diode D1 of the ignition circuit, and the non-ground side terminal of the high-speed exciter coil We2 is connected to the diode D2 whose cathode is commonly connected to the cathode of the diode D1. Connected to the anode. In this case, at low speed, the capacitor C is charged with the output of the low-speed exciter coil We1, and at high speed, the capacitor C is charged with the output of the high-speed exciter coil We2.

In the above embodiment, the number of salient poles is eight. However, the above configuration can be generally applied to a case where four or more even salient poles are provided.

In the above embodiment, the mounting hole 17 is provided in the yoke portion of the iron core, and the stator is fixed to the predetermined mounting portion by the bolt inserted into the mounting hole. However, the size and weight of the generator are reduced. Therefore, when reducing the radial dimension of the yoke, it becomes difficult to provide a mounting hole in the yoke.

In such a case, as shown in FIG. 5, salient poles 2a to 2h
Of these, the two salient poles 2d and 2h at symmetrical positions are empty salient poles (salient poles around which no coil is wound), and mounting holes 17 and 17 are provided in these empty salient poles.

In the example of FIG. 5, every other salient pole 12a, 12c, 12e and 12g
The coils 14a, 14c, 14e, and 14g are continuously wound clockwise, respectively, to form an exciter coil We. In this case, the crossover conductor 16 crossing between the coils crosses the vicinity of the outer periphery of the yoke on the axial end face of the iron core located on the front side of the drawing.

The single-phase armature winding WL for driving a general load and the single-phase armature winding WB for charging a battery are formed of single coils 14b and 14f, respectively. That is, in this example, only the exciter coil is a single-phase armature winding having a multi-coil configuration, and the other armature windings WL and WB are armature windings having a single-coil configuration.

As shown in FIG. 5, in the case where the empty salient poles 12d and 12h are provided and the mounting holes 17 are provided in the empty salient poles, the salient pole 12a around which the coil is wound as compared with the case where the yoke portion is fixed. , 12b, 12c, 12
Since the force for restraining e, 12f and 12g is weak, these salient poles are more likely to vibrate. Therefore, the present invention exerts a particularly great effect when applied to a stator having such a structure.

In each of the above embodiments, at least a portion of the iron core around which the coil is wound is coated with an insulating coating. However, the present invention can be applied to a case where a bobbin is attached to the iron core and the coil is wound around the bobbin. Of course.

In each of the embodiments described above, the salient poles 12a, 12b,... Protrude radially outward from the yoke portion 11 of the iron core, and the magnetic poles of the abduction type in which the magnetic poles of the rotor are arranged outside the stator core. The present invention is applied to the stator of the machine, but salient poles 12a, 12b,... Protrude radially inward from the inner peripheral portion of the yoke portion 11, and the rotor is disposed inside the stator. The present invention can be applied to a stator of a magnet generator of a shape.

[Effects of the Invention] As described above, in the present invention, a single-phase armature winding having a multi-coil configuration is formed by successively winding coils with the winding directions aligned with salient poles having alternating phases of magnetic flux. And, since the crossover conductor between the coils is located on the same axial end side of the yoke, it is necessary to prevent tension from acting on each crossover conductor due to the axial vibration of the salient poles of the stator. Can be. Each transition conductor is fixed to the engine and crosses the outer periphery of the yoke portion of the iron core, which is less likely to vibrate than the salient pole, so each transition conductor vibrates greatly. Can be prevented.

As described above, according to the present invention, since it is possible to prevent a large tension from acting on the transition conductor and to suppress the vibration of the transition conductor, it is possible to eliminate the possibility that the transition conductor is disconnected due to the vibration. There are advantages that can be.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of the present invention, FIG. 2 is an explanatory view for explaining a winding state of the coil of the embodiment of FIG. 1, and FIGS. 3 and 4 are fixings according to the present invention, respectively. FIG. 5 is a circuit diagram showing another example of a circuit configuration of an ignition device suitable for driving by a coil of a child, FIG. 5 is a front view showing another embodiment of the present invention, and FIG. 6 is a front view of a conventional stator. FIG. 7 is an explanatory view for explaining a winding state of the coil in the stator of FIG. 11 ... Yoke section, 12a-12h ... Salient pole, 13 ... Stator core,
14a to 14h: Coil, 16, 16 ', 16 "... Crossover conductor.

Continuation of front page (56) References JP-A-62-114455 (JP, A) JP-A-53-164611 (JP, U) JP-A-52-65217 (JP, U)

Claims (2)

(57) [Claims] 1. A stator core having a number of salient poles protruding radially outward or inward from an annular yoke portion, and a plurality of coils formed by coils wound around the salient poles of the stator core. A single-phase armature winding, wherein at least one of the plurality of single-phase armature windings is configured by serially connecting coils wound around a plurality of salient poles, respectively. In the stator for a magnet generator, which is a winding, a plurality of coils constituting a single-phase armature winding of a multi-coil configuration connected to the same load are respectively connected to a plurality of salient poles having the same alternating phase of magnetic flux. It is wound continuously with the winding direction aligned,
A stator for a magnet generator, wherein a crossover conductor extending between coils of a plurality of coils wound continuously extends near an outer peripheral portion of the yoke on the same axial end side of the iron core. 2. A stator core having a number of salient poles protruding radially outward or inward from an annular yoke portion, and a plurality of coils formed by coils wound around the salient poles of the stator core. A single-phase armature winding, wherein at least one of the plurality of single-phase armature windings is configured by serially connecting coils wound around a plurality of salient poles, respectively. A plurality of coils constituting the at least one armature winding are wound around a coil conductor having a smaller wire diameter than the coils constituting the other armature windings. A plurality of coils constituting a single-phase armature winding of a multi-coil configuration composed of a coil conductor having a small wire diameter are continuously wound with a plurality of salient poles having alternating phases of magnetic flux in the same winding direction. Between the coils of multiple coils that are continuously wound A stator for a magnet generator, wherein the crossover conductor crosses the vicinity of the outer periphery of the yoke at the same axial end side of the iron core.