JPS60184000A - Constant frequency generator - Google Patents

Abstract

PURPOSE:To obtain the AC output of the prescribed frequency irrespective of the variation in the rotating speed of a prime mover by wiring the stator coil of an exciter in a distributed winding, serially connecting the unit coils, controlling a control switching element corresponding to the unit coils and outputting a sinusoidal AC. CONSTITUTION:A rotor 3 of a generator 2 and a rotor 5 of an exciter 4 are fixedly secured to a counterclockwise rotational shaft 1 coupled directly with a prime mover, and stators 6, 7 of the generator 2 and the exciter 4 are provided corresponding thereto. A rotor coil 5a of the exciter 4 is connected in reverse phase to the rotor coil 3a of the generator 2. The unit coils C1-C12 of the exciter 4 are alternately connected in series, and connected with switching elements S1-S12. The elements S1-S12 are controlled to supply a sinusoidal AC from the rotor coil 3a to the rotor coil 3a of the generator 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a constant frequency power generation device in which a generator generates a predetermined frequency even if the rotational speed of a prime mover that drives the generator fluctuates.

[Prior art]

Conventionally, in the case of a Ti generator that outputs a constant frequency even when the rotation speed of the prime mover fluctuates, a winding induction coil is used as a generator, and the rotor winding is controlled to the rotation speed of the prime mover using a variable frequency AC power source. AC excitation at compatible frequencies! 1′? It is known that this is caused by I. That is, the following equation holds between the output frequency f1 of the stator winding, the rotor winding frequency f2, and the rotational speed N of the prime mover.

Therefore, the rotation speed N is detected and the rotor winding is excited at a frequency f2 so that the output frequency f1 is constant, for example, 60 hertz. Note that 1) is the number of poles.

--7'j% The output voltage waveform of the generator is a good sine wave voltage with little distortion when the excitation current applied to the rotor winding of the generator is direct current or sine wave alternating current. It is known. The advantage of sine wave alternating current is that it generates a smooth rotating magnetic field. Therefore, a co-rotating frequency converter is generally used to excite the rotor winding.

This power generation device is extremely effective in outputting a constant frequency in response to fluctuations in the rotational speed of the prime mover.
1L11. requires a current collector consisting of a brush and a slip ring and requires complicated maintenance and inspection. +j, ip (Therefore, a stationary frequency converter using a so-called inverter may be used instead of a rotary frequency converter, but since the output of a stationary frequency converter contains many harmonics. ,
A filter circuit is required to remove harmonics, and since this filter circuit is usually effective only for a specified frequency, a large number of these are required for platforms with large frequency fluctuations, making the device complex and expensive. There is.

The lowest frequency that a stationary frequency converter can output is generally several hertz (Hz) or more, so a discontinuous band occurs between the direct current and the magnetic field, making it impossible to smoothly convert the magnetic field forward and backward. be.

[Purpose of the invention]

The present invention has been made in view of the above two points, and even if the rotational speed of the prime mover has extremely large fluctuations, it can function satisfactorily when the minimum excitation frequency is several hertz or less with a simple configuration, including DC excitation. The purpose of the present invention is to provide a constant frequency power generation device with a constant frequency of λ.

[Structure of the invention]

In order to achieve the above object, the present invention provides an excitation f! ! The rotor coils of the exciter and the generator are electrically connected in opposite phases, and the stator coil of excitation 113m is connected in series to the phase H as a distributed winding, and each unit coil is connected in series with the phase H. It is connected to a DC power source via a corresponding control switching element, and the control switching element is sequentially switched at an appropriate speed according to fluctuations in the rotational speed of the rotating shaft to control the exciter's rotor coil with the necessary sine wave AC. It is characterized in that it is made to be energized.

(Embodiments) Examples of the present invention will be described below with reference to FIGS. 1 to 5.

FIG. 1 shows an overall configuration diagram of a constant frequency power generation device according to the present invention. The same trochanter 3 of 2 and the rotor 5 of the excitation gate 4 are fixedly installed, corresponding to these,
Fixed r6, 7 of the T generator 2 and exciter 4 are provided. In addition, 3a.

5a is a rotor coil, and 6a and 7a are stator coils.

Further, the rotor coil 5a of the machine 4 is electrically connected to the rotor coil 3a of the generator 2 in a reverse phase, and the stator coil 7a is electrically connected to the rotor coil 3a of the generator 2.
is a DC power supply via a controlled switching element SWv,
Connected to C. This stator coil 7a is the stator 7
12 units distributed over the entire circumference = 1 il C1
Unit coils 012 to 012 are housed in stator core suits 1 to 1, and as shown in FIG. S1 to switching element S12.

The switching elements S1 to S12 switch the circuit to the third
As shown in the figure, it is composed of a diode 11, a transistor 12, and a resistor 13. The terminal 14 is connected to the corresponding unit coil (switching element S) of the stator coil 7a.
+ is connected to unit coil C+), terminal 15.16
are connected to (+) and (-) of the DC power supply, respectively. The terminals 17 and 18 are for the control person, and the 10 rotation speed of the rotating shaft is detected by the encoder, and the necessary frequency to excite the rotor coil 5a of the exciter 4 is calculated. To this, a signal of the necessary switching speed extracted from J is input manually.

Then, send a signal to terminal 17 from terminal 15 to terminal 1.
When a current flows to terminal 4 and a signal is input to terminal 18, a current flows from stator coil 7a to terminal 16 via terminal 7a and terminal 1': f-14. Further, when no signal is input to any of the terminals 17 and 18, the terminal 14 and the terminals 15 and 16 are in a non-conducting state.

The operation of the constant frequency power generation device configured as follows will be explained below.

As already explained, in order to output a good voltage waveform from the stator 6 of the generator 2, the rotor coil 3a of the generator 2 is
must be excited with direct current or sinusoidal alternating current. For this purpose, the stator coil 7a of the exciter 4 may be excited so that a smooth rotating magnetic field is generated in the stator 7 of the exciter 4.

Now, when I5\'i is manually applied to the terminal 17 of the switching element S1 and the terminal f18 of the switching element S7, and all other switching elements are brought into the -C)F conduction state, the current flows from the DC power supply DC (4- ) terminal → switching power supply 1) Flows through the path of the (-) terminal of C.

In this state, the rotation ll1l11 is 180Or, p, m,
If the generator 2 is rotating at , the output frequency f1 of the generator 2 having two poles will be 60 hertz from the above equation (1). This state is maintained if the rotational speed of the rotating shaft 1 does not fluctuate.

Now, terminal 17 of switching element S2 and switching resistor S8. When No. 45 is input to terminal 18 of the power supply and the other switching elements are turned off, the current becomes "power supply DCI/) (
–) flows through the path of the terminal. Therefore, the J8 magnetic field generated in the stator 7 of the exciter 4 is φN in FIG.

φS is one unit coil [It will be in a state where it has moved to the right.

This can be expressed as a composite vector of magnetic fields as shown in Figure 5. □ That is, if the composite vector of the magnetic field when the switching elements S+ and Sy are respectively connected to the ('') side and the (-) side of the DC power supply DC is at the position 21, the switching cable 82. The composite vector of the magnetic field when Ss is connected to the (+) side and the =) side of the DC power supply DC is 22.
The position will be Similarly, the control switching cable SW
Continuity switching of v is performed on the DC power supply DC side (
2 r C3...In the order of SI2.8I, (-)
Side 1Js7. Sa, S9...S12...
...If S6 and Sy are performed in this order, the resultant vector of the magnetic field will rotate by -. When the switching speed of the control switching cable SWV is changed, the rotation speed of the magnetic field changes.

Note that if the switching order of the switching elements SWV to be controlled is reversed to the above, the magnetic field rotates 1° in the opposite direction. Therefore, when the rotational speed of the rotating shaft 1 changes, the magnetic field can be moved by switching the conduction of the control switching element SWv to the rotor 5 of the exciter 4.
A substantially sinusoidal alternating current is generated, and excitation at the required frequency can be achieved by changing the switching stray current of the IC control switching element SVW.

The above example (Pa rotation '11111 (7) The number of rotations is 180
Or, p.

m, to 150Or, p, m,: change L/ Tato'j
J-'6, connect the control switching element SWV to the +) side of the DC power supply to S+ + 32...S12
．． 8I, (-) side S7...S12...
...If you switch to S6 and Sy and repeat this cycle 10 times per second, a 35 Hz sine wave alternating current will be generated in the rotor 5 of the exciter 4, and a 60 Hz sine wave alternating current will be generated from the stator 6 of the generator 2. Hertz frequencies will be output.

Also, the number of rotations @1 is 180 Or, p, m.

If it changes from 210Or, p, In, and is written as Pc,
Switch the control switching SWV in the opposite direction to the above.
It can be done 10 times per second.

In addition, a 25-hertz sine wave alternating current is generated in the cotrotor 5 of the J-exciter 4, and a 60-hertz frequency is output from the stator 6 of the generator 2.

The above embodiment also makes it easier to understand/L-me exciter 4
The stator coil 7a has been described as having 12 unit coils C, but if the number of coils in this unit increases (the number of switching elements increases accordingly), the switching element S for the control lever 11 will increase.
The movement of the magnetic field due to conduction switching of Wv, that is, the rotating magnetic field becomes even smoother, and a good sinusoidal alternating current is generated in the rotor 5 of the kD magnet 1 and 4.

In an experiment, if J is used instead of K, then the number of unit coils is 1 or 30-4.
0 pieces is suitable.

〔Effect of the invention〕

In the present invention, the stator fill of the exciter is distributed winding, each unit coil is connected in series to the phase η, and a rotating magnetic field is generated through a control switching cable corresponding to each intermediate coil.
In order to conduct the DC power supply, the rotor 1 of the exciter was excited with a sinusoidal alternating current.
"Conventional maintenance and inspection": There is no need to install the same type of device consisting of an IJ slip ring and an I brush, which has been a problem, and the waveform remains good by -1 minute even when the rotational speed of the rotating shaft changes by -1 minute. It has the effect of outputting a constant frequency wave. Therefore, using the device of the present invention is of course effective in cases where a constant frequency output is required even though the load fluctuation is noticeable, or in cases where a constant frequency is required although the amount of power is small, but it can also be used in other cases. , 1′! l
There is a wide-ranging effect on creating a compact power generation device using a small, fast-rotating engine.

[Brief explanation of drawings]

Figure 1 shows an embodiment of the present invention, and Figure 1 is an explanatory diagram showing the entire device of the present invention. Figure 2 is an explanatory diagram showing an example of connection of the stator coil of an exciter. Figure 4 is an internal circuit diagram of the switching element, Figure 4 is an explanatory diagram of the magnetic field generated in the 1, !, 1 stator of the exciter, and Figure 5 is a composite vector diagram of the GrL magnetic culm. 2 is the generator, 3 is the rotor of the generator, 38 is the rotor-coil, 4 is the exciter, 5 is the rotor of the exciter, 58 is the rotor coil, 6 is the stator of the generator ,6
a is a stator coil, 7 is a stator of the exciter, 7a is a stator coil, 01 to CI2 are unit coils of the stator coil,
SWv is a control switching element, and Sl to Sa2 are switching elements.

Claims (1)

[Claims] 1. Install an exciter that shares a rotating shaft with the generator driven by the prime mover, electrically connect the rotating f coils of the exciter and the generator in opposite phases, and connect the stator of the exciter with a distributed winding. When each unit is connected in series to phase n, each unit is connected to a DC power source via a control switching cable r corresponding to each unit, and is controlled according to fluctuations in the rotational speed of the rotating shaft. The rotor of 1111fi is excited by sequentially switching the switching elements for
1. A constant frequency power generation device characterized in that the coil is excited by a necessary sine wave alternating current.