JPH0458268B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is characterized in that a capacitor excitation winding connected to a phase advance capacitor to form a closed circuit and a load winding to which a load is connected are connected to a stator as an unbalanced two-phase winding. The purpose of the brushless self-excited single-phase synchronous generator is to To provide a brushless self-excited single-phase synchronous generator that improves voltage rise characteristics, improves power generation efficiency, and obtains a relatively large inertial mass so that a flywheel of an engine can be omitted.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. First, in FIGS. 1 and 2, the housing 1 of this generator has a cover 3 fixed to a cylindrical portion 2a that is integral with the crankcase 2 of the engine. It consists of On one side of this housing 1,
A crankshaft 4 of an engine whose end extends into the housing 1 is supported via a bearing 5, and a rotor 6 is connected to the end of the crankshaft 4. on the other hand,
A support shaft 7 is protruded from the cover 3 so as to face the end of the crankshaft 4, and a stator 8 is fixedly supported on the support shaft 7.

The end of the crankshaft 4 is formed into a tapered conical shape, and a receiving member 12 having a conical hole 10 corresponding to the conical portion 9 and a flange 11 at one end is fitted into the conical portion 9. inserted. A male threaded portion 13 is provided protruding from the tip of the conical portion 9, and this male threaded portion 13 is inserted into the central hole 15 of the connecting member 14.
The connecting member 14 includes a disk portion 16 in which a central hole 15 is bored, and an annular portion 17 formed in an annular shape having an inner diameter larger than that of the disk portion 16, which are equally spaced in the circumferential direction. The supporting portion 18 connects the disk portion 16 and the annular portion 17 at a plurality of positions (four in this embodiment). Each support part 18 is connected to the cover 3 of the housing 1.
It is curved so that it expands in the radial direction toward the side. Such a connecting member 14 has a nut 19 attached to the male threaded portion 13 inserted through the central hole 15.
By screwing together and tightening, it is integrally connected to the crankshaft 4. Moreover, the connecting member 14 has
A cooling fan 20 extending radially outward from the disk portion 16 is provided between each support portion 18, and this cooling fan 20 prevents overheating within the housing 1.

The rotor 6 is basically formed in a cylindrical shape,
This rotor 6 is fixed to the annular portion 17 of the connecting member 14 by a screw member 21. The rotor 6 is therefore substantially integrated with the crankshaft 4. The rotor 6 has a pair of circular arc portions 2 at symmetrical positions with respect to its axis, the portions having a central angle α being thinned.
2 and 23 are provided, and these arcuate portions 2
Field windings 24 and 25 are respectively wound around the coils 2 and 23 in an annular manner. Each field winding 24, 25 is connected to a diode 26, 27 as a rectifier to form a closed circuit.

A small diameter portion 28 is provided at the tip of the support shaft 7, and the cylindrical stator 8 is fitted into the small diameter portion 28. A screw hole 29 is concentrically drilled in the tip of the small diameter portion 28, and a bolt 3 is inserted into the screw hole 29 through a washer 30 that abuts one end of the stator 8.
1 are screwed together. Thereby, the stator 8 is held between the washer 30 and the stepped portion 32 of the support shaft 7 created by providing the small diameter portion 28, and is fixed to the support shaft 7. In this fixed state, the stator 8 is arranged such that its outer surface faces the inner surface of the rotor 6.

Referring also to FIG. 3, the stator 8 includes a capacitor excitation winding 34 connected to a phase advance capacitor 33 to form a closed circuit, and a capacitor excitation winding 34 connected to a receptacle 35 provided on the cover 3 to form a closed circuit. The load winding 36 constituting the circuit is wound as an unbalanced two-phase winding so as to have a phase difference of 90 degrees in electrical angle. Further, a lead wire (not shown) for connecting to a load is drawn out of the housing 1 from the receptacle 35 .

To explain the operation of this embodiment, when the rotor 6 rotates together with the crankshaft 4, the rotor 6
An advanced phase current flows through the capacitor excitation winding 34 due to the residual magnetic flux, and accordingly, a positive phase rotating magnetic field having a magnetizing effect and a negative phase rotating magnetic field interlinking with the field windings 24 and 25 are generated. occurs. The reverse phase rotating magnetic field induces an alternating current voltage in the field windings 24 and 25, and the field current is rectified by diodes 26 and 27 to become a direct current. Due to the combination of the self-excitation effect due to the field current and the self-excitation effect due to the magnetizing effect of the positive-phase rotating magnetic field, the phase-advanced current of the capacitor excitation winding 34 gradually increases, and the load increases accordingly. winding 36
A voltage having a phase difference with the capacitor excitation winding 34 is induced in the capacitor, and this voltage is applied to the load from the receptacle 35 via the lead wire.

As described above, according to the present invention, since the rotor is formed in an annular shape surrounding the stator, the length of the arc portion on which the field winding is applied can be made relatively large to lengthen the magnetic path. Therefore, it becomes possible to secure a large residual magnetic flux, and the initial voltage rise characteristics are improved. In addition, since the rotor rotates around the stator, the inertial mass of the rotating part can be increased, and as a result, the flywheel of the engine can be omitted, making the overall engine smaller and smaller.
It can contribute to weight reduction, and costs can also be reduced. Furthermore, since the stator is located within the rotor, it is relatively small, thus reducing the overall length of the capacitor excitation winding and load winding, reducing copper loss and improving power generation efficiency.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a partially cutaway cross-sectional view of the device of the present invention, FIG. 2 is a cross-sectional view taken along the - line in FIG. FIG. 3 is a diagram showing a circuit configuration of lines. 4...Crankshaft, 6...Rotor, 8...Stator, 2
4, 25... Field winding, 26, 27... Diode as a rectifier, 33... Phase advancing capacitor, 34...
Capacitor excitation winding, 36...load winding.

Claims (1)

[Claims] The capacitor excitation winding, which is connected to the linear phase capacitor to form a closed circuit, and the load winding, to which the load is connected, are installed on the stator as an unbalanced two-phase winding, and are connected to the engine crankshaft. In a brushless self-excited single-phase synchronous generator, the rotor is provided with a field winding that forms a closed circuit with a rectifier. A brushless self-excited single-phase synchronous generator, characterized in that the winding is annularly wound around the circular arc portion of the rotor.