JPH061971B2 - Brushless generator - Google Patents

Description

TECHNICAL FIELD The present invention relates to a brushless generator, particularly a single-phase synchronous brushless generator that uses a magnetic flux of an armature reaction, in which the rotation speed of the generator varies. The present invention relates to a brushless generator that compensates for a decrease in output voltage due to

(Prior Art) A single-phase synchronous brushless generator, in particular, a so-called Nonaka type brushless generator that uses magnetic flux of armature reaction has a configuration as shown in FIG. That is, in FIG. 9, a rectifying diode 3 is provided at both ends of a field winding 2 wound around a rotor 1, and a stator 4 has a main winding 5 and an exciter winding 6 at an electrical angle of 90 degrees. It is wound in each position that makes a degree. A capacitor 7 for advancing a phase is connected to both ends of the exciter winding 6. In addition, 8 represents the load.

A capacitor 7 connected to the exciter winding 6 causes a leading phase current to flow in the exciter winding 6, and an induced voltage is generated in the field winding 2 that interlinks with the magnetic flux generated by the leading phase current. A field current flows in the self-excitation. Further, the magnetomotive force of the armature reaction generated by the load current flowing through the main winding 5 generates an alternating magnetic field, and a rotating magnetic field is created. An AC voltage having a frequency twice as high as the synchronous speed is generated in the field winding 2 that is linked to the rotating magnetic field. By rectifying this AC voltage with the diode 3, a field current flows in the field winding 2 and operates so as to compensate for a drop in the output voltage that tends to drop due to the load, and is substantially constant with respect to load fluctuations. The voltage of is maintained.

(Problems to be Solved by the Invention) The conventional brushless generator shown in FIG. 9 has an excellent characteristic that the structure is simple and the load voltage is kept constant despite the increase of the load current. Although it is provided, the output voltage fluctuates not only when there is no load but also when there is a load when the number of revolutions of the generator fluctuates. To fluctuation of the output voltage, it is possible to cope with the voltage fluctuation by controlling the current I _c flowing through the exciter winding 6, the intermittent control of the LC circuit of C L and the capacitor 7 of the exciter winding 6 It is not a good idea to realize.

It is desired to realize a brushless generator that has a simple structure and can cope with rotation fluctuations by adding a simple circuit configuration to the conventional brushless generator.

The present invention has been made in view of the above points, and by connecting the exciter winding in a bridge shape and supplying an exciting current to each exciter winding from the neutral point of the bridge, the exciter winding varies depending on the fluctuation of the rotation speed. It is an object of the present invention to provide a brushless generator whose output voltage can be made constant.

(Means for Solving the Problems) Therefore, the brushless generator of the present invention is provided with a diode at both ends of the field winding, rectifies the induced voltage and self-excites the rotor, and the rotor magnetic field and chain. An exciter winding to which an armature concentrated winding type main winding and a phase-advancing capacitor connected to each other to generate electromotive force are connected, and a stator around which the main winding and the exciter winding are wound. In the single-phase synchronous brushless generator, the stator has a pair of convex magnetic poles formed therein, and a slot into which an exciter winding is divided is formed in the center of each magnetic pole. The divided exciter windings are connected in a bridge shape, and a DC power supply for supplying a DC current for excitation to each exciter winding from the neutral point of the connected bridge is provided, It is characterized in that it is formed into a four-pole convex pole and is connected to form a two-pole field, and is controlled so as to increase the DC current in response to a drop in the output voltage of the generator. Hereinafter, description will be given with reference to the drawings.

(Embodiment) FIG. 1 is a configuration diagram of an embodiment of a brushless generator according to the present invention, FIG. 2 is a magnetic flux explanatory diagram for explaining the flow of magnetic flux of the brushless generator according to the present invention, and FIG. FIG. 4 shows an embodiment of a rotor of a brushless generator according to the present invention, FIG. 4 is an explanatory view of each winding connection, FIG. 5 is an explanatory view of an embodiment of a concrete connection of an exciter winding, and FIG. FIG. 7 shows a circuit configuration diagram of such a brushless generator, FIG. 7 shows a load characteristic curve of the brushless generator according to the present invention, and FIG. 8 shows an embodiment configuration of a control circuit applied to the exciter winding.

In FIGS. 1 and 2, reference numeral 11 is a stator,
The stator cores 12 having the same shape are laminated. As shown in the figure, the stator core 12 faces the inside of the rectangular core and has convex magnetic poles 12a, 12b and 12a.
c and 12d are formed, and slots 13a and 13b into which windings are inserted are provided at the central portions of the magnetic poles 12a and 12b and the magnetic poles 12c and 12d, respectively. The slot 13a
As shown in FIGS. 1 and 2, the magnetic pole 12a is wound with an exciter winding W _a1 and the magnetic pole 12b is wound with an exciter winding W _a2 . Similarly, slot 13
An exciter winding W _a3 is wound around the magnetic pole 12c by using b, and an exciter winding W _a4 is wound around the magnetic pole 12d. And the main winding W _b1 is wound around the outer circumference of the exciter winding W _a1, W _a2, the main winding W _b2 is wound around the outer circumference of the exciter winding W _a3, W _a4. A rotor 14 around which a field winding 15 is wound is rotatably provided at a central position of the stator 11. The rotor 14 is shown in FIG.
(B) As shown in the figure, it is wound so as to form a quadrupole field with a quadrupole field. Due to the winding configuration, the main winding W _b1
On the other hand, when the N pole and the N pole shown in FIG. 3 _{face each} other and the S pole and the S pole face the main winding W _b2 , the field magnetic flux intersects the maximum amount, while the exciter winding W _a1 , W S pole of Figure 3 shown with respect to _a2, N-pole (or N-pole, S-pole) N-pole to the counter vital exciter winding W _a3, W _a4, S pole (or S
When the magnetic poles and N poles face each other, the field magnetic fluxes cross each other by the maximum amount, and the phase difference between the voltage induced in the main winding and the voltage induced in the exciter winding becomes 90 °. Note that FIG. 3 (A) shows a configuration in which both ends of the field winding 15 are connected by diodes 16 for each pole, and FIG. 3 (B) shows that the field winding 15 is wound over two poles. And a diode is connected to both ends thereof.

The winding of the exciter windings W _a1 to W _a4 and the main windings W _b1 and W _{b2 around} the stator 11 is performed by concentrating the windings on a rectangular bobbin in advance, and the exciter windings W _a1 and W _a2 are magnetic poles. 12a, after insertion into 12b, assembled by inserting the main winding W _b1 on the outer circumference of the exciter winding W _a1, W _a2. Assembled in the same manner for the other main winding W _b2.

Now, the exciter windings W _a1 to W _a4 , the main winding W _b1 ,
_Connect W _b2 so that current flows in the direction shown in FIG.
Moreover, if the wires are connected as shown in FIG.
a main winding W _b of _b1 and W _b2, phase difference to W _a1 not connected like a bridge voltage respectively induced in the exciter winding W _a of the W _a4 becomes 90 °. Therefore, by connecting the capacitor 17 for advancing the phase to both ends of the exciter winding W _a connected in a bridge shape, a so-called Nonaka type brushless generator can be constructed.

When a nonaka brushless generator is constructed, the magnetic flux due to the armature action flows as shown by the solid line in FIG. 2 according to the size of the load 18, but the exciter windings W _a1 to W _a4
If the number of _turns of W _a1 = W _a4 , W _a2 = W _a3 is selected, the relationship of W _a1 = W _a4 , W _a2 = W _a3 is maintained even at that voltage, and x and y in FIG. 4 are maintained. The potential difference of is zero. That is, x and y are neutral points.

A static magnetic field is generated on the magnetic poles 12a, 12b, 12c and 12d by applying a DC voltage from x and y as shown in FIGS. 5 and 6 and flowing a DC current through the exciter windings W _a1 to W _a4. To do. This static magnetic field is shown in FIGS. 3 (A) and (B).
Since the illustrated rotor 14 rotates, the field winding 15 wound around the rotor 14 cuts the magnetic flux of the static magnetic field, and a voltage based on the static magnetic field is induced. Then, each diode 16 is rectified to form a field current and self-excited. The field current of the rotor 14 based on this static magnetic field is x,
It is clear that it is proportional to the magnitude of the current from the DC power supply 19 applied from y. Therefore, in the configuration of the present invention, the same action as in the case of the so-called Nonaka equation in which a voltage is induced in the field winding 15 by the magnetic flux created by the exciter winding, and the static magnetic field causes There is a coexistence with the action of inducing a voltage.

FIG. 8 shows an embodiment of a control circuit for applying to the exciter winding, which is a control circuit corresponding to the DC power supply 19 and the variable resistor 20 of FIG.

In FIG. 8, 21 is a power supply winding, 22 is a detection winding, and 2
3, 24 are rectifiers, 25, 26 are transistors, 27 are constant voltage diodes, 28 are diodes, and 29 to 32
Represents resistance.

Power winding 21 using the main windings W _b1, series or each main winding of the W _b2 W _b1, W _b2, detection winding 22 extracts from part of the main winding _b1 or W _b2.

When the brushless generator is at the rated rotation with no load, the transistor 25 is adjusted to an appropriate operating state. When, for example, a load is applied to the brushless generator and the rotation speed is reduced, the detection voltage generated in the detection winding 22 also drops.
Therefore, the peak value of the detection voltage that is full-wave rectified by the rectifier 24 becomes low, and the time during which the constant voltage diode 27 is on becomes short. As a result, the time during which the transistor 26 is turned on is shortened, and the current flowing through the transistor 25 increases. That is, the direct current supplied from the direct current power supply constituted by the power supply winding 21 and the rectifier 23 to the bridge-shaped exciter windings W _a1 to W _a4 via the transistor 26 increases. Conversely, when the rotation speed of the brushless generator decreases, the DC current supplied to the bridge-shaped exciter windings W _a1 to W _a4 decreases. Therefore, as described above, the field current flowing through the field winding 15 is controlled, and the output voltage is kept constant with respect to the rotation fluctuation of the brushless generator.

With respect to the load fluctuation, as a so-called Nonaka brushless generator, a magnetic flux is generated based on the armature reaction shown by the broken line in FIG. 2, and the magnetic flux is generated by the field winding 15. Needless to say, it operates so that the output is kept constant, because it increases the magnetic field. Therefore, when the rotation speed of the brushless generator fluctuates due to load fluctuation, the brushless generator of the present invention has a function of compensating for the fluctuation of the output voltage with respect to both load fluctuation and rotation fluctuation. The load characteristics are as follows.

(Effects of the Invention) As described above, according to the present invention, it is possible to realize a brushless generator that has a simple structure and a simple circuit configuration to make voltage fluctuations due to rotation fluctuations constant. it can. At the same time, the output voltage can be kept constant even with respect to voltage fluctuations caused by load fluctuations and rotation fluctuations.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of the brushless generator according to the present invention, FIG. 2 is a magnetic flux explanatory diagram for explaining the flow of magnetic flux of the brushless generator according to the present invention, and FIG. 3 is related to the present invention. Configuration of one embodiment of rotor of brushless generator, FIG. 4 is an explanatory view of each winding connection, FIG. 5 is an explanatory view of one embodiment of concrete connection of the exciter winding, and FIG. 6 is a brushless generator according to the present invention. 7 is a load characteristic curve of a brushless generator according to the present invention, FIG. 8 is a configuration of an embodiment of a control circuit applied to an exciter winding, and FIG. 9 is a configuration of a conventional brushless generator. An example is shown. In the figure, 1 is a rotor, 2 is a field winding, 3 is a diode, and 4 is
Is a stator, 5 is a main winding, 6 is an exciter winding, 7
Is a capacitor, 8 is a load, 11 is a stator, 12 is a stator core, 12a, 12b, 12c and 12d are magnetic poles, 13a and 13b are slots, 14 is a rotor, 15 is a field winding, 16 is a diode, 17 is a Condenser, 18
Is a load, 19 is a DC power supply, 20 is a variable resistor, 21 is a power supply winding, 22 is a detection winding, 23 and 24 are rectifiers, and 25 and 2
6 is a transistor, 27 is a constant voltage diode, 28 is a diode, 29 to 32 are resistors, W _a1 , W _a2 , W _a3 ,
W _a4 represents an exciter winding, and W _b1 and W _b2 represent main windings.

Claims (1)

[Claims] Claim: What is claimed is: 1. A rotor provided with diodes at both ends of a field winding to rectify an induced voltage and self-excite, and an armature concentrated winding type main unit that interlocks with a magnetic field of the rotor to generate electromotive force. In a single-phase synchronous brushless generator comprising an exciter winding to which a winding and a phase advancing capacitor are connected, and a stator around which the main winding and the exciter winding are wound, the stator is A pair of convex magnetic poles and a slot in which the divided exciter windings are wound in the center of each magnetic pole, and the divided exciter windings are connected in a bridge shape. In addition, a DC power supply for supplying a DC current for excitation from the neutral point of the connected bridge to each exciter winding is provided, and the rotor is formed into a four-pole convex pole and does not form a two-pole field connection. , A brushless generator characterized in that the direct current is controlled to increase in response to a drop in the output voltage of the generator.