JPH0528065B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is directed to a brushless three-phase generator, in particular, to a rotor having a multi-pole field core by means of excitation windings provided in the stator. In the brushless three-phase generator, the field winding is excited, and the induced voltage in the field winding is half-wave rectified to supply field current to the field winding. This invention relates to a brushless three-phase generator in which a toroidal winding that can control the supply current is wound around a stator core, and output voltage is adjusted by magnetically saturating the stator core during a phase-advanced load.

(Problems to be solved by the prior art and the invention) Conventionally, a brushless single-phase generator with a simple structure and excellent characteristics has been used to rectify the alternating current voltage induced in the field winding with a diode. 2. Description of the Related Art A so-called Nonaka type generator is known in which a field current is applied to a magnetic winding. Then, a brushless 4 as shown in Figure 2 which applies the basic principle of the Nonaka type generator mentioned above.
Polar three-phase generators have been proposed (for example, in JP-A-58
-63057). In Fig. 2, 1 is a stator, 2 is a rotor, 3 is a 4-pole, 3-phase main power generation winding, 4 is a 2-pole, single-phase excitation winding, 5 is a DC power supply battery, and 6 is a current In the regulator, 7-1 to 7-4 are field cores, 7-1' to 7-4' are salient poles, 8-1 to 8-4 are field windings, and 9 is a diode.

In the example shown in FIG. 2, the four-pole field cores 7-1 to 7-4 provided in the rotor 2 are
Field windings 8-1 to 8-4 are wound around. A diode 9 is connected to each of the field windings 8-1 to 8-4, and the field is connected so that N, S, N, and S magnetic poles are generated in sequence at the salient poles 7-1' to 7-4'. The magnetic cores 7-1 to 7-4 are configured to be magnetized. That is, in the example shown in FIG. 2, when the rotor 2 rotates, the stationary magnetic field of the excitation winding 4 causes field current to flow in the direction of the arrow in the figure through the field windings 8-1 to 8-4. The field cores 7-1 to 7-4 are magnetized to form four field poles, and a three-phase AC output is obtained from the four-pole, three-phase main power generation winding 3.

The example illustrated in FIG. 2 described above prevents fluctuations in the output voltage due to fluctuations in the rotational speed of the rotor 2, for example, by controlling the excitation current to the excitation winding 4 via the current regulator 6. It is configured to perform output voltage regulation (hereinafter referred to as AVR).
However, when a phase leading load is connected,
When the phase-advanced current flows through the main power generation winding 3, a self-excitation effect is exerted on the field windings 8-1 to 8-4, so that the output voltage increases, and the excitation current is controlled as described above. However, the voltage increase cannot be suppressed. That is, in the example shown in FIG. 2, there is an undesirable problem in that the AVR cannot function effectively under a phase-advanced load.

(Means for Solving the Problems) The present invention aims to solve the above problems, and therefore, the brushless three-phase generator of the present invention has a three-phase main power generation winding on the stator. and a single-phase excitation winding, and a field winding magnetically coupled to the excitation winding is wound around a rotor having a multipolar field core, and each of the excitation windings is A brushless three-phase generator configured to connect a rectifying element having a half-wave rectifying action, comprising a toroidal winding wound around the iron core of the stator, and supplying current to the toroidal winding to the main power generator. It is characterized in that it is configured to be controlled based on the output voltage of the winding. This will be explained below with reference to the drawings.

(Embodiment of the invention) FIG. 1 shows a circuit configuration in an embodiment of the invention. Reference numerals 2 and 5 in the figure correspond to those in FIG. 2, 1' is a stator core, 10 is a toroidal winding, and 11 is a current regulator.

The configuration of the brushless three-phase generator of the present invention is basically the same as the conventional example shown in FIG. 2 described at the beginning of this specification. That is, although not shown in FIG. 1, the main power generation winding 3 and excitation winding 4 shown in FIG. 2 are wound around the stator core 1', and the The excitation current is supplied by a battery 5 via a current regulator 6. Further, each field core of the rotor 2 is also wound with field windings 8-1 to 8-4 each having a diode 9 connected thereto, as shown in FIG.

In the embodiment shown in FIG. 1, in addition to the above basic configuration, a toroidal winding 10 is wound around the stator core 1' to magnetically saturate the stator core 1'. The current supplied to the toroidal winding 10 is configured to be supplied by the battery 5 via a current regulator 11 that is controlled based on the output voltage. The operation of the embodiment shown in FIG. 1 will be explained below.

When the output voltage of the generator is lower than the operating voltage of the current regulator 11, it operates in the same manner as the example shown in FIG. 2 described at the beginning of this specification (the explanation of the operation is omitted because it is redundant). However, in the case of a phase-advanced load, the output voltage increases as described above, and the increase in output voltage cannot be suppressed only by controlling the excitation current to the excitation winding 4 (shown in FIG. 2). In the example shown in FIG. 1, when the output voltage increases and exceeds a predetermined value, the current regulator 11 is controlled in accordance with the output voltage, and the toroidal winding wound around the stator core 1' is A current is supplied to line 10. By supplying current to the toroidal winding 10, the stator core 1' is magnetically saturated. Then, due to the magnetic saturation of the stator core 1', the magnetic resistance when the field magnetic flux circulates through the stator core 1' increases, and the field magnetic flux density decreases. As a result, the output voltage can be lowered.

(Effects of the Invention) As explained above, according to the present invention, when the output voltage exceeds a predetermined value, it is possible to magnetically saturate the stator core and lower the output voltage.
Output voltage regulation can be made to function effectively even when a phase-advancing load is applied.

[Brief explanation of the drawing]

FIG. 1 shows a circuit configuration in an embodiment of the present invention.
FIG. 2 shows the circuit configuration of a conventional brushless three-phase generator. In the figure, 1 is a stator, 1' is a stator core, 2 is a rotor, 3 is a main power generation winding, 4 is an excitation winding, 5 is a battery, 6 and 11 are current regulators, and 7-1 to 7
-4 is the field core, 7-1' or 7-4' are salient poles,
8-1 to 8-4 represent field windings, 9 represents a diode, and 10 represents a toroidal winding.

Claims (1)

[Claims] 1. A three-phase main power generation winding and a single-phase excitation winding are wound around a stator, and a field winding is magnetically coupled to the excitation winding on a rotor having a multipolar field core. A brushless three-phase generator configured to wind the field windings and connect a rectifying element having a half-wave rectifying action to each of the field windings, comprising a toroidal winding wound around the iron core of the stator. A brushless three-phase generator, characterized in that the current supplied to the toroidal winding is controlled based on the output voltage of the main power generation winding.