JPH0353595Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an inductor type generator, which is a type of synchronous generator, and in particular, an induction type generator that compensates for the demagnetizing effect caused by the load current flowing through the armature coil to improve output. Regarding child generators.

An inductor generator is known as a type of synchronous generator. In this generator, a field coil and an armature coil are provided on the stator, and inductor magnetic poles are provided on the rotor side. Therefore, when the field coil is excited, the magnetic flux density changes at a constant period due to the inductor magnetic poles as the rotor rotates, and this magnetic flux interlinks with the armature coil on the rotor side. Therefore, an output voltage is induced in the armature coil, which can be extracted and used as power generation output. In addition, such inductor type generators do not require a coil on the rotor side, and therefore do not require brushes or slip rings, making it possible to obtain high-frequency power with a simple structure. .

However, if a resistor, for example, is connected as a load to the armature of such an inductor-type generator, a load current will flow through the armature coil due to this resistor, and this load current will be generated in the armature coil. Generally, there will be a delay of 45 to 60 degrees with respect to the induced voltage. Therefore, the magnetic flux generated by this load current also lags behind the magnetic flux induced by the field coil, and for this reason, the load current performs a demagnetizing effect. Therefore, such an inductor type generator has the disadvantage that its output decreases due to the load current, and its efficiency also deteriorates.

The present invention was developed in view of these problems, and is an inductor type generator that increases output and improves efficiency by compensating for the demagnetizing effect caused by load current. The purpose is to provide the following.

The present invention will be explained below with reference to an illustrated embodiment.
In this embodiment, the inductor type generator according to the present invention is applied to a retarder that generates braking force for braking an automobile. Figure 1 shows an automobile engine 1 equipped with a retarder made of this inductor type generator.
A flywheel housing 2 is provided on the rear side of the engine 1. A flywheel 3 is disposed within the housing 2 as shown in FIG. The flywheel 3 is a crankshaft 4 that constitutes the output shaft of the engine 1.
is fixed to the end. Furthermore, a transmission 5 is attached to the rear side of the flywheel housing 2, and this transmission 5 changes the speed of the rotation of the engine 1, and the changed speed is transmitted to the propeller shaft. 6 to transmit the signal to the drive wheels.

An inductor 7 is attached to the outer periphery of the flywheel 3 disposed in the flywheel housing 2, and the inductor 7 has a protruding magnetic pole 8 projecting outward in the radial direction. are provided at intervals. Therefore, the flywheel 3 provided with the inductor magnetic poles 8 constitutes the rotor of the inductor type generator. On the other hand, cases 9 extending in the circumferential direction are provided at the upper and lower parts of the flywheel housing 2, respectively, and a stator including a field coil and an armature coil is housed within these cases 9. has been done. The field coil is connected to the battery 10 via the controller 11, and the battery 10 is connected to the controller 11.
An exciting current is made to flow through the field coil through the field coil. On the other hand, the armature coil in the case 9 is connected to a resistor in the cooling box 12 shown in FIG. 2, and the resistor consumes power and converts it into heat. A water pipe 13 is connected to the cooling box 12 to cool this heat.

Next, we will discuss the structure of the inductor type generator, which is formed by the rotor consisting of the flywheel 3 and the stator in the case 9, and constitutes a retarder.
Explanation will be given with reference to FIG. 4 and FIG. Pole cores 14 are arranged in the case 9 at a predetermined pitch in the circumferential direction, and the lower end of the core 14 faces the inductor magnetic pole 8 via a small air gap. The pole core 14 is fixed to the stator yoke 15. Furthermore, pole core 1
4 and the stator yoke 15 are connected by a connecting bolt 17 to which a cover plate 16 covering the upper opening of the case 9 is attached. On the other hand, the inductor magnetic pole 8 is attached to a mounting portion 19 formed on the outer periphery of the flywheel 3 by a fixing bolt 18. Note that the clutch cover 20 is fastened together with the inductor magnetic pole 8 by bolts 18. Further, a ring gear 21 is attached to the mounting portion 19 on the opposite side of the inductor magnetic pole 8. A clutch is provided inside the flywheel 3 which is closed by the clutch cover 20.

Further, a field coil 22 and an armature coil 23 are wound around the pole core 14 in the case 9. These coils 22 and 23 are commonly wound across a pair of adjacent pole cores 14, and a pair of pole cores 14 around which the field coil 22 is wound and a pair around which the armature coil 23 is wound. The pole cores 14 are shifted by one from each other. Furthermore, the winding direction of the field coil 22 or the connection with the battery 10 is alternately reversed, so that the direction of magnetization of the pole core 14 is reversed two by two as shown in FIGS. 4 and 5. It's becoming like that. Therefore, instead of winding the field coil 22 across the two pole cores 14,
Alternatively, a field coil 22 may be separately wound around each pole core 14, and these may be connected to the battery 10 so that the direction of magnetization of the pole core 14 is reversed two by two as shown in FIGS. 4 and 5. good.

Furthermore, in this inductor type generator, Figure 3~
As shown in FIG. 5, a compensation coil 24 is wound around the pole core 14. This coil 24 is disposed above the armature coil 23, and is wound over a pair of mutually adjacent pole cores 14. The manner in which the coil 24 straddles the pole core 14 is different from that of the armature coil 23.
The position is the same as that of the field coil 22, and is shifted by one position from that of the field coil 22. Then, the armature coil 23 is connected to the load resistance 2 as shown in FIG.
5, whereas the compensation coil 24
is connected to the phase advancing capacitor 26. Note that the load resistor 25 is housed in the cooling box 12 shown in FIG.

Next, the operation of the retarder made of the inductor type generator having the above configuration will be explained. When a vehicle equipped with an engine equipped with this retarder goes down a long slope, for example, the retarder switch installed in the driver's seat is closed, the driver takes his foot off the accelerator pedal, and depresses the brake pedal. The brake switch is then closed by depressing the brake pedal, and the output of this switch is supplied to the controller 11 shown in FIG. Therefore, the field coil 22 of the inductor type generator is connected from the battery 10 via the controller 11.
A current flows through the field coil 22 and the field coil 22 is excited.

FIG. 4 shows a state in which the flywheel 3 is in a certain rotational position so that every other pole core 14 faces the inductor magnetic pole 8. Therefore, in this case, the magnetic flux 27 as shown by the chain line in FIG. It will pass through the inside as shown by the arrow in the figure. Next, when the flywheel 3 rotates by an angle corresponding to the pitch of the pole core 14, it becomes as shown in FIG. 5, and in FIG.
You will be facing. In this case, the magnetic flux 28 passes through the magnetic circuit including the pole core 14 as shown by the chain line in FIG.

The directions of the magnetic flux 27 shown in FIG. 4 and the magnetic flux 28 shown in FIG. 5 are reversed, and this reversed magnetic flux interlinks with the armature coil 23 as shown in the figure. Therefore, an electromotive force is induced in the armature coil 23. This is flywheel 3
will do work, meaning that kinetic energy is converted into electrical energy. Therefore, this power generation causes the retarder to generate braking force, which applies braking force to the engine 1 or the vehicle. Note that this power generation output is based on the cooling box 1 shown in Figure 2.
The heat is consumed by the resistor 25 (see FIG. 6) inside the box 12, and the heat is dissipated from the resistor 25 by the cooling water circulating inside the box 12.

Furthermore, this inductor type generator is equipped with a compensation coil 24 as described above, and this compensation coil 24 is connected to a phase advancing capacitor 26 as shown in FIG. Therefore, in order to compensate for the demagnetizing effect caused by the load current flowing through the armature coil 23, the compensation coil 24 generates a magnetic flux that cancels out the magnetic flux caused by the load current, and this magnetic flux is The magnetic flux of the armature coil 23 due to the load current is canceled out.

This operation is also explained by the graph shown in FIG. That is, the magnetic flux generated by the field coil 22 of this generator and interlinking with the armature coil 23 changes as shown by the solid line in FIG. As a result, an induced voltage as shown by the dotted line in the figure is generated in the armature coil 23, and this voltage has a lag of 90 degrees with respect to the above-mentioned magnetic flux. And depending on this voltage, the load resistance 2
5 generally changes with a delay of 45 to 60 degrees more than the voltage shown by the dotted line, as shown by the dashed line in FIG.
Therefore, when this load current flows through the armature coil 23, it generates a magnetic flux that performs a demagnetizing action. However, the compensation coil 24 also has the above magnetic flux 2.
7 and 28, and since a capacitor 26 is connected to this coil 24, a current as shown by a two-dot chain line in FIG. 7 flows through this coil 24.

Armature coil 2 shown by a dashed-dotted line in Fig. 7
3 and the current flowing through the compensation coil 24 as shown by the two-dot chain line in the figure are not completely in anti-phase relationship, but are almost in anti-phase relationship. Therefore, the magnetic fluxes generated by these two currents will substantially cancel each other out. Therefore, the compensation coil 2 to which such a capacitor 26 is connected
4, it is possible to compensate for the demagnetizing effect caused by the load current, thereby increasing the output of the generator and improving the efficiency.
Furthermore, the braking force of the retarder configured by this generator can be increased.

Next, a modification of the above embodiment will be explained with reference to FIG. In this modification, parts corresponding to those in the above embodiment are given the same reference numerals, and descriptions of parts having the same configuration will be omitted. In this modification, a plurality of capacitors 26 are connected to the compensation coil 24 in parallel, and each capacitor 26
A switch 29 is connected in series with the switch 29. These switches 29 are connected to the controller 3
Its opening/closing is controlled by 0. Further, the controller 30 opens and closes the switch 29 based on the output of a rotation detection sensor 31 that detects the rotation of the engine 1.

Therefore, according to such a modification, the engine 1
The capacitance of the capacitor 26 connected to the compensation coil 24 is changed by controlling the opening and closing of the switch 29 by the rotation detection sensor 31 and the controller 30 according to the number of rotations. Therefore, it is possible to control the amount of current that flows through the compensation coil 24 and compensates for the demagnetization effect. Therefore, this makes it possible to control the output of the inductor type generator as well as the braking force of the retarder constituted by this generator. When the rotation speed of the engine 1 is high, the output of the generator that makes up this retarder also becomes high, so a large braking force is obtained, and the need to compensate for the demagnetization effect due to the load current is reduced. In this case, the capacitance of the capacitor 26 may be reduced. On the other hand, when the rotational speed of the engine 1 is low, the output of the generator becomes low and the braking force also decreases. Therefore, in this case, many switches 29 may be closed to increase the capacitance of the capacitor 26 connected to the coil 24 to increase the braking force.

FIG. 9 shows yet another modification, in which a varicap 32 is connected to the compensation coil 24, and the capacity of the varicap 32 is determined based on the detection by the rotation detection sensor 31. , and is controlled by a controller 30. Therefore, with such a configuration, the compensation coil 2 can be replaced without providing a large number of switches.
4 can be adjusted, and the braking force of the retarder can be controlled according to the rotational speed of the engine 1.

Next, a tenth modification of the above embodiment will be described.
This will be explained with reference to the diagram. This modification is a further modification of the generator circuit shown in FIG.
In addition, a capacitor 33 is connected in parallel. Therefore, in this case, the output voltage induced in the armature coil 23 is applied to the parallel circuit of the capacitor 33 and the resistor 25,
This allows the phase of the load current to advance. By advancing the phase of this load current, it becomes possible to reduce the magnetic flux that performs the demagnetizing effect.
This increases the power generation output. Furthermore, this generator has a compensation coil 2 connected to a capacitor 26.
4, it is possible to generate a magnetic flux that cancels out the demagnetizing effect.
The output will further improve.

FIG. 11 shows a further modification of the modified example shown in FIG.
It is composed of 2. The capacities of these variable caps 34 and 32 are controlled by a controller 30 based on detection by a rotation detection sensor 31 that detects the rotation speed of the engine 1. Therefore, with such a configuration, it is possible to control the phase of the load current and the current flowing through the compensation coil 24, and thereby the output of the generator can be controlled. Therefore, the braking force of the retarder constituted by this generator can also be controlled in accordance with the rotational speed of the engine 1.

Although the present invention has been described above with reference to an illustrated embodiment,
The present invention is not limited to the above embodiments, and various modifications can be made based on the technical idea of the present invention. For example, the above embodiment relates to an inductor type generator applied to a retarder, but the present invention can also be applied to an inductor type generator used for other purposes such as a high frequency generator.

As described above, the present invention provides a compensation coil in the stator and connects this compensation coil to a capacitor, so that the compensation coil transmits a magnetic flux that cancels out the demagnetizing effect caused by the load current flowing through the armature coil. This relates to an inductor type generator that generates electricity. Therefore, according to the present invention, by compensating for the demagnetizing effect by the compensation coil, it is possible to increase the output of the generator and improve the efficiency.

[Brief explanation of the drawing]

FIG. 1 is a side view of an engine equipped with a retarder consisting of an inductor generator according to an embodiment of the present invention;
Fig. 2 is a perspective view of the retarder installed in this engine, Fig. 3 is an enlarged sectional view of the main part of the inductor type generator that constitutes this retarder, Fig. 4 is an exploded front view of the same, and Fig. 5 is A front view similar to Fig. 4 when the flywheel is rotating, Fig. 6 is a circuit diagram showing the connection of this generator, Fig. 7 is a graph showing the compensation operation by the compensation coil, and Fig. 8 is a modified example. FIG. 9 is a circuit diagram of a generator according to another modification, FIG. 10 is a circuit diagram of a generator according to yet another modification, and FIG. 11 is a modification shown in FIG. 10. FIG. 2 is a circuit diagram of a generator in which the example is further modified. In addition, in the symbols used in the drawings, 3...flywheel, 7...inductor, 8...inductor magnetic pole, 1
4...Pole core, 15...Stator yoke, 22
... Field coil, 23 ... Armature coil, 24 ...
... Compensation coil, 25 ... Load resistance, 26 ... Phase advance capacitor.

Claims (1)

[Scope of utility model registration request] In an inductor type generator in which a field coil and an armature coil are provided on the stator side and inductor magnetic poles are provided on the rotor side, a compensation coil is provided on the stator, and this compensation coil is connected to a capacitor. An inductor type generator, characterized in that the compensating coil is connected to the armature coil and generates a magnetic flux that cancels the demagnetizing effect caused by the load current flowing through the armature coil.