JP3367213B2 - Magnet generator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnet generator used as a power source for ignition, lighting and charging of an internal combustion engine.

[0002]

2. Description of the Related Art Magnetogenerators mounted on an internal combustion engine or the like and used as a power source for ignition or lighting of the engine or a power source for charging a battery are required to have a small size and high output. Therefore, as this type of magnet generator, a salient pole type magnet generator having an armature core having a plurality of coil winding portions radially protruding from an annular yoke portion is often used.

FIG. 7 shows an example of a conventional magneto-generator of this type having a four-pole structure. This magneto-generator has a substantially cup-shaped inner wall of a rotor yoke 7. Arrange a plurality of permanent magnets 8 to 11 around the circumference at equal angular intervals,
A magnet rotor 1 in which permanent magnets 8 to 11 are magnetized so that rotor magnetic poles having different polarities are alternately arranged in the circumferential direction, and a plurality of coil winding portions 13 to 13 radially protruding from an annular yoke portion 12. An armature core 2 in which pole piece portions 17 'to 20' are formed at the respective tips of 16 and coil winding portions 13
Nos. 16 to 16 and armature coils 3 to 6 respectively wound around them. Pole pieces 17 'to 20'
The magnetic pole surface formed at the tip of is opposed to the cylindrical inner peripheral surface of the rotor magnetic pole through a predetermined gap,
The pole arc angle α of each rotor magnetic pole is set to be equal to or larger than the pole arc angle β of the tip of each pole piece of the armature core. The armature coil 3 is
For example, it is used as an exciter coil for charging the ignition energy storage capacitor of the capacitor discharge type ignition device, and the armature coils 4 to 6 are used as, for example, a power generation coil for lighting or a power generation coil for charging a battery.

In the above magnet generator, the magnet rotor 1
When is rotated, the magnetic flux passing through each coil winding portion, for example, the magnetic flux φ ′ passing through the coil winding portion 13, changes as the curve of the broken line in FIG. Due to this change in magnetic flux, the voltage V of the waveform as shown by the broken line in FIG. 3B is applied to the armature coil 3 wound around the coil winding portion 13.
'Is induced. In this generator, the magnetic flux φ'passing through the coil winding portion 13 becomes the maximum magnetic flux (effective magnetic flux) φm 'as shown in FIG. 8, which is the pole piece portion 17' formed at the tip of the coil winding portion 13. When the center portion of the magnetic pole surface in the circumferential direction coincides with the center portion of the rotor magnetic pole in the circumferential direction, at this time, a gap (gap) between the entire magnetic pole surface of the pole piece portion 17 'and the rotor magnetic pole. The magnetic flux from the permanent magnet flows through the coil winding portion 13 via the. In addition, the induced voltage V ′ of the armature coil 3
Usually becomes maximum near the position where the direction of the magnetic flux flowing in the coil winding portion 13 changes from one to the other (see FIG. 3). The same applies to the other coil winding portions 14 to 16.

[0005]

When the magnetic flux passing through the coil winding portion of the armature core around which the armature coil is wound alternates, the coil winding portion generates heat due to iron loss. Therefore, the heat generation due to the copper loss of the armature coil causes the temperature rise of the armature coil. In particular, when the armature coil is a coil wound many times using a thin copper wire, such as an exciter coil used as an ignition power source of a capacitor discharge type ignition device, its self-heating is large,
In addition to this, heat generation due to iron loss causes the temperature of the coil to rise significantly, which lowers the reliability of the coil and requires the use of an expensive coil conductor having high heat resistance.

The iron loss generated in the iron core is composed of hysteresis loss and eddy current loss, and the maximum magnetic flux density of the magnetic flux passing through the iron core is β
If p is the alternating frequency of the magnetic flux, t is the thickness of one of the iron cores, and the hysteresis loss and eddy current loss constants determined by the iron core material are σh and σe, the iron loss Wi per unit weight of the iron core is Given by the formula.

Wi = σh · f · βp ² + σe · t ² · f ² · βp ² Here, if σh, σe, t and f are constant, the iron loss Wi
Is proportional to the square of the maximum magnetic flux density β p.

In the conventional magneto-generator, the maximum magnetic flux (effective magnetic flux) of the coil winding portion of the armature core is increased with the increase in size and output.
Since the value of φ m ′ becomes large and the maximum magnetic flux density becomes large, iron loss also becomes large and the temperature rise of the armature coil becomes large. If the output of a permanent magnet that gives a magnetic flux to the coil winding portion is reduced, or if the cross-sectional area of the magnetic flux path of the coil winding portion is reduced, the effective magnetic flux can be reduced and iron loss can be reduced. In this case, the voltage induced in the armature coil also drops.

An object of the present invention is to reduce the maximum magnetic flux of the coil winding portion without reducing the magnitude of the induced voltage of the armature coil and suppress the temperature rise of the armature coil due to iron loss. It is to provide a magnet generator capable of performing.

[0010]

SUMMARY OF THE INVENTION According to the present invention, a permanent magnet comprises a rotor yoke and permanent magnets attached to the rotor yoke, and the permanent magnets are arranged such that rotor magnetic poles of different polarities are alternately arranged in the circumferential direction. A magnetized magnet rotor, an annular yoke portion, a plurality of coil winding portions projecting radially from the yoke portion, and pole piece portions formed at the respective tips of the plurality of coil winding portions. And an armature coil wound around a coil winding portion of the armature core, wherein the magnetic pole surface formed at the tip of each pole piece of the armature core is a rotor. The present invention relates to a magneto-generator that faces a cylindrical inner surface of a magnetic pole with a predetermined gap.

In the present invention, the pole arc angle of the rotor magnetic pole is set to be equal to or greater than the pole arc angle of the tip of the pole piece portion of the armature core, and the magnetic pole surface at the tip of each pole piece portion of the armature core is circumferentially oriented. A recess is formed in the center of the magnetic pole, and the portion between the circumferential end of the magnetic pole surface at the tip of each pole piece and the circumferential end of the recess is defined as the inner circumferential surface of the magnetic pole of the magnet rotor. It was formed into a cylindrical surface so as to extend along.

In the present invention, instead of forming a recess in the circumferential center of the magnetic pole surface at the tip of each pole piece of the armature core, the circumferential center of the magnetic pole surface at the tip of each pole piece is formed. You may make it form a flat surface in a part. In this case as well, the portion between the circumferential end of the magnetic pole surface at the tip of each pole piece and each circumferential end of the flat surface is shaped like a cylindrical surface along the inner circumferential surface of the magnetic pole portion of the magnet rotor. To form.

[0013]

The magnetic flux passing through each coil winding portion of the armature core is radially distributed between the circumferential center of the magnetic pole surface at the tip of each pole piece of the armature core and the circumferential center of the rotor magnetic pole. It becomes the maximum when it is in a state of facing on a straight line along it, but as described above, a recess is formed in the center part in the circumferential direction of the magnetic pole surface at the tip of each pole piece part of the armature core, or a flat surface Is formed,
The area (cavity area) of the cylindrical surface portion of the magnetic pole surface of each pole piece portion that opposes the cylindrical inner peripheral surface of the rotor magnetic pole through a predetermined gap is equal to the concave portion of the magnetic pole surface of the pole piece portion. It is smaller than when a flat surface is not formed. Therefore, the maximum magnetic flux of the coil winding portion is also small, and the iron loss of the armature core is small. Also, the magnitude of the voltage induced in the armature coil depends on when the central portion in the circumferential direction of the magnetic pole surface of each pole piece of the armature core passes through the central position between adjacent rotor magnetic poles ( The direction of the magnetic flux passing through the winding part alternates from one to the other)
However, the magnitude of the change over time in the magnetic flux of the coil winding portion is not affected by the presence or absence of a recess or flat surface formed in the circumferential center of the pole face of the pole piece. .

Therefore, it is possible to reduce the maximum magnetic flux of the coil winding portion to reduce the iron loss without reducing the magnitude of the induced voltage of the armature coil, and suppress the temperature rise of the armature coil. You can

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment in which the present invention is applied to a four-pole structure magnet generator installed in an internal combustion engine. In the figure, 1 is a magnet rotor, 2 is an armature core, 3
Reference numerals 6 to 6 are armature coils wound around the armature core 2, and the armature core 2 and the armature coils 3 to 6 constitute a stator of the magneto-generator.

The magnet rotor 1 comprises a substantially cup-shaped rotor yoke (flywheel) 7 made of a ferromagnetic material such as iron.
And arc-shaped permanent magnets 8 to 11 mounted on the inner circumference of the peripheral wall portion 7a of the yoke at equal angular intervals. These permanent magnets are magnetized (radially magnetized) so that rotor magnetic poles 8a to 11a having different polarities are alternately arranged in the circumferential direction of the yoke.

The rotor magnetic poles 8a to 11a all have the same polar arc angle α, and each inner peripheral surface is formed to have a cylindrical surface shape. A boss (not shown) is provided in the central portion of the bottom wall portion 7b of the rotor yoke 7, and the boss is fitted to the rotation shaft of the internal combustion engine (not shown) so that the magnet rotor 1
Is attached to the internal combustion engine.

The armature core 2 is formed by stacking core pieces punched into a predetermined shape. The iron core 2 used in this embodiment includes an annular yoke portion 12 and a plurality (four in this embodiment) of coil winding portions 13, 14 and 15 protruding radially from the yoke portion at equal angular intervals. And 16, and pole piece parts 17, 18, 19 and 20 formed at the tips of the coil winding parts 13, 14, 15 and 16, respectively. When the polar arc angle at the tip of each pole piece is β, the pole arc angle α of the rotor magnetic pole is set to be equal to or larger than the pole arc angle β of the pole piece of the armature core.

In the central portion in the circumferential direction of the magnetic pole surface at the tip of each of the pole piece portions 17 to 20 of the armature core, concave portions 17a, 18a, 19a each having a groove shape (having a U-shaped cross section) are formed.
And 20a are formed. Magnetic pole surfaces (17b, 17c), (18b, 18c) at portions between the circumferential end portions of the magnetic pole surfaces at the tips of the pole piece portions 17 to 20 and the circumferential end portions of the concave portions 17a to 20a, (19b,
19c) and (20b, 20c) are formed in a cylindrical surface shape along a cylindrical inner peripheral surface of the rotor magnetic poles 8a to 11a of the magnet rotor via a predetermined gap.

The armature core 2 is positioned by fitting the inner periphery of the yoke portion 12 as a spigot portion 12b and fitting a spigot portion provided on a mounting portion such as a crankcase of an internal combustion engine to the spigot portion 12b. The mounting screws respectively inserted into the four through holes 12a provided in the yoke portion 12 are screwed into the screw holes provided on the mounting portion side to be fixed.

The armature coils 3 to 6 are respectively wound around the coil winding portions 13 to 16 of the armature core, and for example, the armature coils 3 drive the ignition device for an internal combustion engine. It is used as an exciter coil for ignition power sources.

When the magnet rotor 1 rotates in the magneto-generator having the above structure, the cylindrical magnetic pole surface of each pole piece of the armature core and the cylindrical inner circumference of each rotor magnetic pole of the magnet rotor. The magnetic flux passing through the coil winding portions 13 to 16 of the armature core changes due to the change of the facing area between the surfaces and the polarity of the rotor magnetic poles facing the pole pieces of the armature core. A plurality of (2 in this embodiment) cycles are changed per one rotation. Due to this change in magnetic flux, a voltage is induced in each of the armature coils 3 to 6.

FIGS. 2A to 2C show how the magnetic flux φ passing through the coil winding portion 13 of the armature core changes depending on the rotation angle position θ of the magnet rotor 1, and FIG. (A) shows the waveform of the magnetic flux φ interlinking with the coil 3. The state where the circumferential center of the pole piece portion 17 at the tip of the coil winding portion 13 and the circumferential center portion of the adjacent permanent magnet of the magnet rotor, for example, the portion between the magnets 8 and 9 coincide with each other is θ. When = 0, the magnetic flux passing through the coil winding portion 13 is zero in this state (see FIG. 3A). From this state, the magnet rotor 1 rotates in the direction of the arrow shown in FIG.
As shown in (A), the front end of the rotor magnetic pole 8a in the rotating direction reaches the end of the pole piece portion 17c on the concave portion 17a side of the magnetic pole surface 17c, and the entire surface of the cylindrical magnetic pole surface 17c becomes the rotor magnetic pole. 8a
In a state where the magnetic pole surface 17c and the rotating magnetic pole 8a face each other, a magnetic flux φ1 (see FIG. 3A) flows through the coil winding portion 13 in a state where the magnetic pole surface 17c and the rotating magnetic pole 8a face each other. From θ = 0 to θ = θ1, the magnetic flux passing through the coil winding portion 13 is almost the same as in the conventional magnet generator having no recess 17a in the pole piece portion. The magnet rotor 1 further rotates and θ =
At θ 2 (= 45 °), as shown in FIG.
In the state where the center in the circumferential direction of 7 and the center in the circumferential direction of the rotor magnetic pole 8a coincide with each other, the magnetic pole surfaces 17b and 17 of the pole piece portion 17 are provided.
Both surfaces of c face the rotor magnetic pole 8a. In this state, the magnetic flux passing through the coil winding portion 13 has the maximum value (effective magnetic flux) φm. At this time, since the magnetic flux flowing through the recess 17a is only a slight leakage flux, the magnitude of the effective magnetic flux φm is smaller than the effective magnetic flux φm ′ in the case of the conventional magneto-generator having no recess 17a. (See Figure 3A). The magnet rotor further rotates in the direction of the arrow shown,
2C, the rear end of the rotor magnetic pole 8a in the rotational direction is the recess 17a of the magnetic pole surface 17b of the pole piece portion 17 as shown in FIG. 2C.
When reaching the end on the side and the entire surface of the cylindrical magnetic pole surface 17b faces the rear end portion of the rotor magnetic pole 8a, the gap between the magnetic pole surface 17b and the rotor magnetic pole 8a faces. A magnetic flux φ3 (see FIG. 3A) having substantially the same magnitude as the magnetic flux φ1 flows through the coil winding portion 13 via the. θ = θ3 to θ
Up to .theta.4 (= 90.degree.), The magnetic flux passing through the coil winding portion 13 is almost the same as in the conventional magnet generator in which the pole piece portion 17 does not have the recess 17a.

Rotation angle of magnet rotor 1 θ = 90 ° -18
In the range of 0 °, the magnetic flux passing through the coil winding portion 13 is θ
= 0 ° to 90 °, the same change occurs in the state where the magnetic flux direction is reversed. Further, in the range of θ = 180 ° to 270 °, the same change as in the case of θ = 0 ° to 180 °. Occurs. Therefore, the magnetic flux φ passing through the coil winding portion 13 during one rotation of the magnet rotor 1 is 2 as shown in FIG.
Make a cycle change.

FIG. 3B shows a voltage waveform induced in the armature coil 3 wound around the coil winding portion 13.
In the same figure, the waveform V shown by the solid line shows the case of this embodiment, and the waveform V'shown by the broken line shows the magnet power generation of the conventional example in which the pole piece portion formed at the tip of the coil winding portion 13 does not have the concave portion 17a. The case of the machine is shown. Θ = 0 °, 90 °, 18 where the time change of the magnetic flux passing through the coil winding portion 13 is the largest.
In the vicinity of 0 ° and 270 °, since the magnetic flux passing through the coil winding portion 13 is almost equal to that of the conventional generator, as described above, the maximum voltage induced in the armature coil 3 of the generator of this embodiment is maximum. The value is almost equal to the maximum value of the voltage obtained by the conventional generator.

As described above, according to this embodiment, the voltage flowing through the coil winding portion of the armature core flows through the coil winding portion without substantially reducing the magnitude of the voltage induced in the armature coil wound around the coil winding portion. It is possible to reduce the magnitude of the effective magnetic flux, reduce the iron loss generated in the coil winding portion, and suppress the temperature rise of the armature coil.

FIG. 4 shows the relationship between the charging voltage Vc of the ignition energy storage capacitor and the rotation speed when the armature coil is used to charge the ignition energy storage capacitor of the capacitor discharge ignition device. The experimental results are shown. In the figure, the curve shown by the solid line shows the case of this embodiment, and the curve shown by the broken line shows the case of the conventional example. As is apparent from FIG. 4, the charging voltage Vc is slightly lower in the case of the present embodiment in the rotation range of medium speed or lower, but in the high speed range where the temperature rise of the exciter coil is generally high, Also in the case of the conventional example, the charging voltage Vc is the same.

In the above-mentioned embodiment, the concave portion provided in the central portion of the magnetic pole surface at the tip of each pole piece portion of the armature core is formed in the shape of a square groove (a groove having a U-shaped cross section). For example, as shown in FIG. 5, the groove 17 a ′ having a circular cross section.
May be

In the above embodiment, the recess is formed in the center of the magnetic pole surface at the tip of each pole piece of the armature iron core. However, even if a flat surface is formed instead of forming the recess, the object of the present invention is achieved. Can be achieved.

FIG. 6 shows an embodiment in which a flat portion is formed on the magnetic pole surface at the tip of the pole piece portion 17. In this example, a diameter is formed in the circumferential center portion of the magnetic pole surface at the tip of the pole piece portion 17. A flat surface 17a ″ that is perpendicular to the direction is formed, and portions 17b and 17c between the circumferential end of the magnetic pole surface at the tip of the pole piece portion 17 and the circumferential end of the flat surface 17a ″ are magnets. It is formed into a cylindrical surface along the inner peripheral surface of the magnetic pole portion (for example, 8a) of the rotor. Also in this case, the maximum value of the magnetic flux passing through the coil winding portion of the armature core is smaller than that when the flat surface is not formed, and moreover, the direction of the magnetic flux passing through the coil winding portion is alternating from one to the other. The magnitude of the magnetic flux change that occurs when the coil is wound is almost the same whether a flat surface is formed or not, so reduce the maximum value of the induced voltage of the armature coil wound around the coil winding section. In addition, the iron loss can be reduced and the temperature rise can be suppressed.

In the above embodiments, the four-pole magnet generator is taken as an example, but the present invention can be applied to a magnet generator having two or six or more poles.
In the above embodiment, the magnetic pole surface of the inner circumference of each permanent magnet itself is used as the rotor magnetic pole, but pole pieces made of a magnetic material are attached to the inner circumferential surface of each permanent magnet, and the cylindrical surface of the pole piece is attached. The inner peripheral surface may be used as the rotor magnetic pole.

[0032]

As described above, according to the present invention, a concave portion or a flat surface is formed in the circumferential central portion of the magnetic pole surface at the tip of each pole piece portion of the armature core to form a coil winding portion. Since the maximum value of the magnetic flux (effective magnetic flux) in the coil winding part is reduced without reducing the magnitude of the change in the magnetic flux that interlinks the wound armature coil, the induced voltage in the armature coil is reduced. It is possible to reduce the iron loss of the armature core and suppress an increase in the temperature of the armature coil, with almost no decrease in temperature. Therefore, there is an advantage that the reliability of the armature coil can be improved, and a copper wire having low heat resistance can be used for the armature coil, and the magnet generator can be constructed at low cost.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

2A to 2C are explanatory views showing the flow of magnetic flux at different rotational positions of the magnet rotor in the embodiment of FIG. 1, respectively.

FIG. 3 is a waveform diagram showing a magnetic flux waveform of a coil winding portion of an armature core and an induced voltage waveform of an armature coil in the example of FIG. 1 and the conventional example.

FIG. 4 is a diagram showing the charging voltage characteristics of the ignition energy storage capacitor in the case of the embodiment of FIG. 1 and in the case of the conventional example.

FIG. 5 is a front view showing a main part of another embodiment of the present invention.

FIG. 6 is a front view showing a main part of still another embodiment of the present invention.

FIG. 7 is a front view showing a conventional example.

8 is an explanatory diagram showing the flow of magnetic flux in the coil winding portion in the state of FIG. 7.

[Explanation of symbols]

1 magnet rotor 2 Armature iron core 3-6 Armature coil 7 rotor yoke 8-11 Permanent magnet 8a to 11a rotor magnetic poles 12 Yoke 13 to 16 coil winding section 17 to 20 pole pieces 17a to 20a Recess 17a 'recess 17a ″ flat surface

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H02K 21/22

Claims (4)

(57) [Claims] 1. A permanent magnet is attached to a rotor yoke and permanent magnets attached to the rotor yoke so that a plurality of rotor magnetic poles of different polarities are alternately arranged in the circumferential direction at equal angular intervals. A magnetized magnet rotor, a ring-shaped yoke portion, a plurality of coil winding portions protruding in the radial direction from the yoke portion at equal angular intervals, and formed at the tips of the coil winding portions, respectively. An armature core having a pole piece portion, and an armature coil wound around a coil winding portion of the armature core, wherein a magnetic pole surface formed at a tip of each pole piece portion of the armature core The rotor magnetic pole is opposed to the cylindrical inner peripheral surface of the rotor magnetic pole through a predetermined gap, and the polar arc angle of the rotor magnetic pole is
The armature core is set to a pole arc angle of the tip of the pole piece or more
And a pole piece portion at the tip of each coil winding portion of the armature core
The center of the magnetic pole surface in the circumferential direction is between the adjacent rotor magnetic poles.
Direction of magnetic flux passing through each coil winding part when passing through the center position
In the magneto-generator configured to alternate, a recess is formed in the central portion in the circumferential direction of the magnetic pole surface at the tip of each pole piece portion of the armature core, and each pole piece portion of the armature core is formed. The portion between each circumferential end of the magnetic pole surface at the tip and each circumferential end of the recess is formed into a cylindrical surface along the inner circumferential surface of the magnetic pole portion of the magnet rotor, and the coil winding is formed . Before the direction of the magnetic flux flowing through the
The change that occurs in the magnetic flux flowing through the coil winding part is
In the case where no recess is provided in the center of the surface in the circumferential direction,
A magnet generator characterized in that they are configured to be substantially the same . 2. A plurality of rotor magnetic poles, which are composed of a rotor yoke and permanent magnets attached to the rotor yoke, and which have different polarities alternately in the circumferential direction, are arranged in front at equal angular intervals. A permanent magnet is magnetized, a magnet rotor, a ring-shaped yoke portion, a plurality of coil winding portions radially projecting from the yoke portion, and a plurality of coil winding portions formed at the tips of the coil winding portions. An armature core having a pole piece portion and an armature coil wound around a coil winding portion of the armature core, and a magnetic pole surface formed at a tip of each magnetic pole piece of the armature core. The rotor magnetic pole is opposed to the cylindrical inner peripheral surface of the rotor magnetic pole through a predetermined gap, and the polar arc angle of the rotor magnetic pole is equal to that of the armature core.
It is set to be equal to or greater than the polar arc angle of the tip of the pole piece,
Circumferential direction of the pole face of the pole piece at the tip of each coil winding part of the child core
The central part of the direction passes through the central position between the adjacent rotor magnetic poles.
So that the direction of the magnetic flux passing through each coil winding part alternates
In the magnet generator configured as described above, a flat surface is formed in the central portion in the circumferential direction of the magnetic pole surface at the tip of each pole piece portion of the armature core, and in each circumferential direction of the magnetic pole surface at the tip of each pole piece portion. portion between each circumferential end of the the end flat surface is formed in a cylindrical surface shape along the inner circumferential surface of the magnetic pole portion of the magnet rotor, the direction of the magnetic flux flowing through the coil winding portion Before the police box
The change that occurs in the magnetic flux flowing through the coil winding part is
When there is no flat surface in the center of the surface in the circumferential direction,
A magnet generator characterized in that they are configured to be substantially the same . 3. A rotor yoke (7) and said rotor yoke.
Four arc-shaped permanent magnets attached to (7) at equal angular intervals.
The yoke consists of permanent magnets (8 to 11)
Rotor magnetic poles (8a or
11a) were magnetized so that the four permanent magnets were aligned.
4-pole magnet rotor, annular yoke portion (12) and the yoke portion
4 coil windings projecting in radial direction at equal angular intervals from
Section (13 to 16) and each of the four coil winding sections
The pole piece (17 to 20) formed at the tip of the
Armature core 2 and four coil windings of the armature core
Armature coil wound on each mounting part (13 to 16)
(3 to 6) and each pole piece of the armature core
The magnetic pole surface formed at the tip of the portion is the cylindrical surface of the rotor magnetic pole.
The Jo of the inner peripheral surface is made to face through a predetermined gap, before
The polar arc angle α of each rotor magnetic pole of the magnet rotor is the armature iron
It is set to a polar arc angle β or more at the tip of each pole piece of the heart,
The magnetic pole of the pole piece at the tip of each coil winding portion of the armature core
The center of the surface in the circumferential direction and the center between the adjacent rotor magnetic poles
The magnetic flux passing through each coil winding becomes zero when
In the magneto-generator configured as described above, the magnetic pole surfaces at the tips of the four pole piece portions of the armature core are circumferentially arranged.
Recesses (17a to 20a) are formed in the central part of
And each circumferential end of the magnetic pole surface at the tip of each pole piece of the armature core.
Portion between each circumferential Direction end parts and the recess the magnet times
A cylindrical surface is formed along the inner peripheral surface of the magnetic pole of the trochanter.
Is, before the time the direction of the magnetic flux flowing through the coil winding portions alternates
The change that occurs in the magnetic flux flowing through the coil winding part is
In the case where no recess is provided in the center of the surface in the circumferential direction,
A magnet generator characterized in that they are configured to be substantially the same . 4. A rotor yoke (7) and said rotor yoke.
Four arc-shaped permanent magnets attached to (7) at equal angular intervals.
The yoke consists of permanent magnets (8 to 11)
Rotor magnetic poles (8a or
11a) were magnetized so that the four permanent magnets were aligned.
From a 4-pole magnet rotor, an annular yoke section 12 and the yoke section
Four coil winding parts protruding in the radial direction at equal angular intervals
(13 to 16) and each of the four coil winding parts
A pole piece (17 to 20) formed at the tip of
Armature core 2 and four coil windings of the armature core
Armature carp wound on each part (13 to 16)
(3 to 6), and each pole piece of the armature core
The magnetic pole surface formed at the tip of the rotor is a cylindrical surface of the rotor magnetic pole.
The inner peripheral surface is made to face via a predetermined gap, the
The polar arc angle α of each rotor magnetic pole of the magnet rotor is the armature iron core.
Is set to be equal to or greater than the polar arc angle β at the tip of each pole piece of
Magnetic pole face of the pole piece at the tip of each coil winding part of the armature core
Between the center of the rotor in the circumferential direction and the center between the adjacent rotor magnetic poles
When they match, the magnetic flux passing through each coil winding becomes zero.
In the magneto-generator configured as described above, the four pole piece parts (17 to 20) of the armature core are aligned.
A flat surface is formed at the center of the magnetic pole surface at the tip in the circumferential direction.
And each circumferential end of the magnetic pole surface at the tip of each pole piece of the armature core.
The portion between the end portion and each circumferential end of the flat surface is the magnet.
A cylindrical surface is formed along the inner peripheral surface of the rotor magnetic pole.
Is, before the time the direction of the magnetic flux flowing through the coil winding portions alternates
The change that occurs in the magnetic flux flowing through the coil winding part is
When there is no flat surface in the center of the surface in the circumferential direction,
A magnet generator characterized in that they are configured to be substantially the same .