JPS602867B2 - high speed rotating generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high-speed rotational generator that is directly connected to a high-speed small engine of an aircraft.

High-speed rotation generators generally use a solid rotor system in order to withstand centrifugal force, and permanent magnet generators are used, and the rotor structure may be modified from shrink-fitting in terms of the strength of the magnet material. It is being done.

In addition to the above-mentioned centrifugal force resistance, high-speed rotation generators used as aircraft power sources have a. Overload capacity of 200% or more, b. High reliability, c. Compact, high output, d. It is required to satisfy various characteristics of low radio noise. Therefore, in order to reduce the demagnetizing force due to excessive armature reaction during overload, the length of the magnet in the magnetization direction is made sufficiently large.
The generator output voltage is adjusted by the DC magnetomotive force of the control winding using magnetic saturation, without relying on the switching action of semiconductor elements such as transistors and thyristors inserted in the main circuit.
Based on the competitive fit theory of magnet material reinforcement, the magnetic flux path part is made of magnetic material to reduce magnetic resistance and increase magnetic flux density. To provide a high-speed rotating generator with large turns, high reliability without using semiconductor switch action, low generation of radio noise, high magnetic flux density, and large output capacity.

Hereinafter, the present invention will be specifically explained with reference to illustrated embodiments.

Figure 1 is a cross-sectional view of an embodiment on the rotor side, in which the magnetic pole direction is orthogonal to the rotor radial direction to increase the magnet length, and the rotor is made smaller in size by using high-cobalt cobalt magnets. A magnetic part Q is inserted between two magnets 1 and the magnets that will become the rotor pole. It is composed of a strong fit 2, a shaft 3 to which the magnet 1 is attached, and a mounting screw 4 to attach the magnetic part Q between the magnets to the shaft 3. That is, the magnets are arranged circumferentially rather than radially;
A special feature of the rice bran fit theory is that the magnetic flux transfer part is made of a magnetic material.As a result, the length of the magnet can be increased, and the magnetic coercivity can be greatly reduced.
In addition, while the conventional type could not avoid creating a gap equal to the thickness of the scale fitting ring 2 by increasing the overload capacity, the present invention solves this problem, reducing the magnetic resistance and increasing the magnetic flux. Figure 2 shows a cross-sectional view of the embodiment on the stator side, and Figure 3 shows a graph of magnetomotive force first-generation force voltage to explain the action. Although a magnetic rotor is used, this is for the convenience of explanation, and the rotor of the present invention has a special structure using the competitive fit theory shown in the previous figure. A slot 7 for mounting the armature winding is formed on the inside of the regular permanent steel rotor 6, which is an iron core on the stator side.The present invention makes use of this slot 7. As shown in the figure, the control winding IQ is inserted into the upper part of the slot 7 so as to be wound between it and the outer peripheral part 6a of the core. Also, an armature winding is inserted in the lower layer, which is no different from that of a normal magnet generator.Next, the operation will be explained.The magnetic flux due to the rotating field pole 5 of the permanent magnet is the N pole. The magnetic flux from the magnetomotive force of the control winding Q is formed along the solid line a shown in FIG. The magnetomotive force caused by the control winding 8' is formed in one direction along the circumferential direction. The pole acts in the direction of weakening it. Therefore, the former acts as a nutrient, while the latter acts as a condensing agent. This situation is explained using the generator no-load saturation curve 3 in Figure 3. Figure 3 is a no-load saturation curve with the supermagnetic force on the horizontal axis and the generator output voltage on the vertical axis.If the magnetomotive force due to the rotating field pole 5 is ATn, the output voltage of the generator is VI, and the control voltage The magnetomotive force ATC due to the line IQ acts summatively or conversely, differentially, and the generator output voltage increases by △VI at one of the two poles and increases at the other two poles.
The pole decreases by ΔV2, and in the former case it becomes V2 which is increased by ΔVI from VI, and in the latter case it becomes V3 which is ΔV stolen or decreased from VI. Therefore, when calculating the average voltage change AV from 4 based on the magnetomotive force based on the energization of the control winding 10, △V:△V1⑱△
V2-…--.

1, and this is because due to the influence of magnetic saturation of the iron core, △VI is necessarily smaller than △V2 and AV is negative, and the new output voltage VI of the generator is ``Vr = V2 1 V3...■, so the original output voltage is It is smaller than VI and it is possible to control the generator output voltage V only in the direction of decreasing it by energizing the control winding.

In this way, the present invention utilizes the magnetic saturation of the generator magnetic path to
It energizes a control winding that has a horizontal suction effect and controls the output voltage to decrease to maintain a constant voltage. In other words, in order to control the voltage to a constant voltage, set the minimum input rotation speed so that the generator output voltage is a constant rated voltage at maximum load (of course the second flow of control winding is zero), and set the input rotation speed to a constant value. rise,
It is characterized in that the increase in output voltage due to a decrease in load is offset by a decrease in the average value of magnetic force due to energization of the control winding, and the rated voltage is maintained.

Fig. 3 is a circuit diagram of a constant voltage DC power supply system using a permanent magnet generator with a control winding according to the present invention.

In the same figure, the turtle blade is a permanent magnet generator with a control winding, of which 11a is the control winding, turtle blade b is the rotating field pole of the permanent magnet, and 1 blade (: is the armature winding and 3-phase It is. Matakame 2
A rectifier consisting of a diode bridge, a capacitor, etc. converts the three-phase AC voltage generated in the armature winding cage lc into a DC voltage and shapes the waveform. 13 is a load.

The DC output voltage is fed back by the heavy voltage regulator and compared with the command value corresponding to the rated voltage. An excess of the output voltage is detected, and a corresponding current is passed through the control winding 11a to bring the output voltage to the rated voltage. return. That is, as mentioned earlier, when the input rotation speed is minimum and the load is maximum, the current flowing to the control winding 11a is zero and the generator output voltage is set to the rated voltage. Increase: When the generator output voltage increases due to a decrease in load, the voltage regulator 14 operates and energizes the generator control winding a to reduce the field magnetomotive force and reduce the increase in output voltage. Control to rated voltage.
In this way, the present invention has a special structure for the rotating field poles, and uses slots for the armature winding to uniformly wind the control winding around the stator core to increase or decrease the energization of the control winding. This type of conventional rotor structure uses a non-magnetic material shrink fit theory and transistors in the main circuit.

Compared to those that insert thyristors and adjust the voltage by the action of these switches, the performance is significantly improved, the overload capacity is over 200% rated, high reliability, small size, high output,
It has an excellent feature of low radio noise, which fully satisfies various characteristics that must be provided as a power source for aircraft and flying objects.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a rotor according to an embodiment of the present invention, FIG. 2 is a sectional view of a stator according to the same embodiment, FIG. 3 is a graph for explaining its operation, and FIG. 1 is a block diagram of a voltage DC power supply system. 1... Rare cobalt magnet, 2... Shrink fit theory of pole part made of magnetic material, 3... Q shaft, 6...
...Stator core, 7...Armature winding slot, 1
0...Control winding. Spear figure, Z figure, O3 figure, Sai figure, 4 figure

Claims (1)

[Claims] 1. The rotor is constructed by fitting a shrink fit ring to a permanent magnet. In a high-speed rotation generator, on the rotor side, permanent magnets are attached to the shaft so that the direction of magnetic force is perpendicular to the radial direction of the rotor, a magnetic material is used between the magnets, and a shrink-fit ring is placed in contact with the magnetic path. The part between the magnets is made of magnetic material, and the rest is made of non-magnetic material. On the stator side, a slot for armature winding in the stator core is used, and a control winding is inserted between this slot and the outer periphery of the core. and the control winding is energized so as to reduce the magnetomotive force of the rotating field pole of the permanent magnet.