JPS61143000A - Biaxial drive differential type shaft generator - Google Patents

Abstract

PURPOSE:To simply obtain the constant frequency output by controlling the relative speed between an armature winding and an exciting winding. CONSTITUTION:An exciting winding 14 is provided in a rotor 10, and both ends are supported to a rotor bearing 16. A rotary stator 20 is disposed on the outer periphery of the rotor 10. An armature winding 22 is provided on the stator 20, and both ends are supported by stator bearings 24. A stator driver 28 is coupled through a gear mechanism 26 with one end of the stator 20. The stator 20 is rotated in response to the variation in the rotating speed of a rotor shaft 12 to set the relative speed to constant value so as to maintain the frequency constant. Thus, the constant frequency output can be readily obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is a power converter that converts the power generated by an alternator driven by variable rotational speed shafts such as various propeller shafts and axles whose rotational speeds fluctuate. This invention relates to a shaft power generation device that can generate constant voltage and constant frequency electric power.

[Conventional technology]

Conventionally, as this type of shaft power generation device, a general synchronous generator was shaft-coupled to a variable speed drive shaft, and the variable frequency AC power obtained from this synchronous generator was converted to DC power using a rectifier. A device configured to convert DC power using a separately excited thyristor inverter to obtain constant voltage/constant frequency AC power is known. In this case, to make the AC power system constant voltage, an excitation adjustment device that controls the excitation current of the synchronous phase modifier according to the load is installed, and the necessary reactive power is supplied to the synchronous phase modifier, and the AC power system is This is achieved by supplying active power. Also, the active power to the AC power system is.

It can be changed by controlling the excitation current of the synchronous generator supplied from this system via the excitation device and the excitation winding.

However, the following problems have been pointed out in the shaft power generator configured in this manner.

(1) Since the system is constituted by a single rotating machine consisting of a synchronous generator and a synchronous phase modifier, the efficiency is poor, and for example, the efficiency of conventional devices is about 3% at most.

(2) Waveform distortion of voltage and current occurs due to the thyristor inverter.

(3) There are many components, increasing the installation area.

[Problems to be Solved by the Invention] Therefore, in the present invention, since the frequency is determined by the relative speed between the armature winding and the excitation winding, one of the windings on the variable rotation speed shaft is By driving the wire and differentially controlling the rotation speed of the other winding using another drive machine, the relative speed of both windings is kept constant and the frequency is constant. The object of the present invention is to provide a two-shaft drive differential type shaft power generation device that can easily obtain the output of the following.

[Means for solving problems]

Therefore, in the present invention, in a shaft power generation device that generates AC power by driving an alternating current generator having an excitation winding and an armature winding coupled to a variable rotation speed shaft, the excitation winding and the armature winding are One of the windings of the wire is connected to the variable rotation speed shaft and driven to rotate, and the other winding is rotationally driven by a variable speed drive machine provided separately from the variable rotation speed shaft. However, the rotational speed of the other winding is differentially controlled with respect to the rotational speed of the one winding.

In this case, in the two-shaft drive differential shaft power generator, one winding of the alternator is rotatably driven by the variable rotation speed shaft, and the other winding is kept at a constant relative speed by the drive machine. By controlling it, constant frequency alternating current power can be generated.

Furthermore, an induction machine can be used as an alternator and configured to control the relative speed between the armature winding and the squirrel cage coil or wound coil of the induction machine.

[Effect]

According to the present invention, between opposing windings of an alternator, when one is rotationally driven by a variable rotation speed shaft, the other is reversibly rotationally driven by another drive machine, so that both of the windings are configured to be rotationally driven. The frequency of the generator output, which is determined by the relative speed between the windings, can be kept constant. Moreover, in this case, since the driving machine adjusts the relative rotational speeds, the configuration is not only simplified, but also the output characteristics of the obtained AC power are stabilized.

〔Example〕

Next, embodiments of the two-shaft drive differential shaft power generation device according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a cross-sectional structure of essential parts showing one embodiment of the shaft power generator of the present invention. That is, in FIG. 1, the reference symbol /σ
indicates a rotor, and a variable rotation speed shaft (not shown) is connected to one end of the rotor shaft of the rotor/θ, and is configured to be driven. Further, the rotor lθ is provided with an excitation winding /Q, and both ends thereof are supported by rotor bearings /6 and /6. Furthermore, an exciter/shaft is provided at the other end of the first rotor shaft and the second rotor shaft.

On the other hand, a rotary stator -0 is arranged around the outer periphery of the rotor /θ. This rotary stator -〇 has the rotor/
An armature winding 22' is provided opposite the excitation winding /q of θ, and both ends of the stator -0 are brought into sliding contact with the rotor /, 0, and the outer periphery thereof is a stator bearing, 2! , , 2 & , ) Rotatably supported. Furthermore, a gear mechanism 26 is provided at one end of the rotary stator -0, and is configured to be coupled to any drive shaft 3θ of the stator drive machine 2 for rotational driving. A slip ring 32 is provided at the other end of the rotary stator θ to collect the armature current generated in the expanded armature winding 22, and the slip ring 32 is configured to lead to the outside. Therefore, reference numeral 3y is a part configured as a terminal box and an excitation adjustment device.

Next, the operation of the shaft power generator of the present invention having the above configuration will be explained.

(1) Regarding generation of constant frequency power The frequency of generator generated power is determined by the number of poles, armature winding, 2- and excitation winding/
4 is determined by the relative speed between them. In this embodiment, the rotation speed of the excitation winding/g is arbitrarily determined by the variable rotation speed axis, so in order to keep the frequency constant, it is necessary to adjust the rotation speed of the variable rotation speed axis, that is, the rotor shaft 7.2. Accordingly, the rotary stator 〇 is rotated by the stator driver 2t, and the rotor/θ is
This is achieved by adjusting the relative speed between the stator and the stator to be constant.

Therefore, this principle of operation will be explained in detail with reference to FIGS. 1 and 3. Figures 1 and 3 are rotor/θ
Excitation winding/da and armature winding of rotating stator θ, 22
This shows the relationship between rotation direction and rotation speed. Now, the excitation winding/ge rotates clockwise at a rotation speed NB, whereas the armature winding 2.2 rotates clockwise (-) or counterclockwise (+) at a rotation speed ±ΔN. If that is the case,
The relative speed Ns between both windings is determined by the following equation.

NR:Na±ΔN・・・・・・・・・・・・・・・
・(1) Here, the excitation winding/4t that keeps the frequency constant and the rotation speed of the armature winding saw are defined as follows.

Ntc max: Maximum excitation winding that keeps the frequency constant/4t rotation speed Nlmin: Minimum excitation winding that keeps the frequency constant/l
rotation speed Na mean: (Na min + NRmax
) / , 2ΔN max : The relationship between the rotation speed of the excitation winding /l and the armature winding 22 is as follows based on the definition of the maximum rotation speed of the armature winding 22 or more.

a. When the rotation speed of the excitation winding/4t is smaller than NRmean: In this case, the two armature windings rotate counterclockwise (+), and the magnitude is l NR-1-NRmeam l increases or decreases in proportion to

b. When the rotational speed of the excitation winding/g is larger than NRmean: In this case, the 'rlL machine winding 2.2 rotates clockwise (-), and its magnitude is INR-Nmean 1. increase or decrease proportionately.

Next, the operation of the stator drive machine t that controls the rotation direction and rotation speed of the armature winding 2 will be explained.

In this case, since the torque (T rating ) between the armature winding 2.2 and the excitation winding 79 is considered to be the same according to the law of action and reaction, the generator output (P rating )
) is given by the following equation.

P rating = T rating (Namin
+ΔNmax)=TraLingeNRmin-)
-TratingoΔNmax・・・・・・・・・・・・
- (2) Therefore, Trating*ΔNmax becomes the burden output of the driving machine 2g.

In this case, the generator output (P rating ) is given by the following equation.

Praiing = T rating (NR
max−ΔNmax)= T rating @
Nu max −T ratmu nq°・ΔNma
x・・・・・・・・・・・・ (3) Tracing, -Trating*ΔNmax is the driving machine, 2f
This will be the burden output. At this time, the negative sign means that the drive unit and the two act as brakes.

In the above-mentioned embodiment, a system was described in which the direction of rotation of the armature winding is switched between forward and reverse with respect to the excitation winding. is always selected to be below the synchronous speed so that the rotation of the armature winding is always kept in the counterclockwise direction,
Alternatively, it is also possible to always select the rotation speed of the excitation winding to be higher than the synchronous speed so that the rotation of the armature winding is always maintained in the clockwise direction.

In addition, in the above embodiment, a synchronous generator is used, and the excitation winding is used on the rotor side, and the armature winding is used on the stator side. A method in which the excitation winding or squirrel cage winding is placed on the outside and the armature winding is placed on the inside; the armature winding side is connected to a variable rotation speed shaft and the excitation winding side is connected to a drive machine, etc. Of course, many design changes can be made.

〔Effect of the invention〕

As is clear from the embodiments described above, according to the present invention,
The excitation winding or the armature winding is driven by a variable rotation speed shaft, and the one winding that is not driven by the variable rotation speed shaft is rotated by another driver, and the relative speed of both windings is kept constant. By configuring the generator to obtain a constant frequency generator output, many advantages can be obtained as described below.

I) Since the rotating machine consists of seven units and the output of the drive machine for frequency correction can be designed to be extremely small, the efficiency increases significantly, for example, the maximum is θ and the minimum is t.

■) By changing the number of poles of the generator, the input shaft (variable rotation speed shaft)
The range in which a constant frequency can be guaranteed can be greatly increased.

For example, if the generator is set to 60Hz and the input rotation speed is guaranteed to be constant between 700 and 70%, then
The number of rotations is as follows.

Na maX ffP =riθθ×/θθ/IS=/
θSza, lf r, p, m.

NRmin zap=riθθx70/zaj=7tl/
, /7 r, p, m.

ΔNmax=(/θjza,za-74t/,/7)/co=
istt, p, m.

Therefore, the driver on the armature winding side is 10/j・r, p, m
, prepare one that can perform rotation correction.

This generator is equipped with a /6-pole pole number changer, NRm
in/Ap=! jθ−15=λ, lr, p,
m.

A constant frequency can be generated up to the rotation of N
2//θ, 1fIr, θ=θ, , 274 for a max ZP, therefore, it is possible to keep the 9 frequencies constant over a wide range of input rotational speeds from /θθ to 27.6ch. It becomes possible.

ll) By adding a device to the rotational speed control of the frequency correction drive machine, it is possible to control the direction of electric power and operate the electric motor while the variable rotational speed shaft is in operation.

IV) Since no thyristor element is used in the main power circuit,
Waveform distortion caused by thyristors can be prevented.

■) There are fewer components and the installation area can be reduced.

vl) When the variable rotation speed shaft is stopped, the motor can be operated using the drive machine for frequency correction, and the functionality can be expanded.

vll) Since the generated frequency is determined by the relative speed between the variable rotation speed shaft and the drive shaft for frequency correction, by changing this relative speed by the drive shaft, it can also be used as a variable frequency power source. can.

Although the preferred embodiments of the present invention have been described above, it is of course possible to make various design changes without departing from the spirit of the present invention.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional side view of essential parts showing an embodiment of the two-shaft drive differential type shaft power generator according to the present invention, and Fig. 2 shows the relationship between the rotational directions of the two shafts of the shaft power generator shown in Fig. 1. The explanatory diagram shown in FIG. 3 is a characteristic diagram showing the relationship between the rotational direction and the rotation speed of the two axes shown in FIG. 1. 10...Rotor /, 2...Rotor shaft/
G...Excitation winding /6...Rotor bearing/Ni...
・Exciter θ・・・Rotating stator, 2 pieces・
... Armature winding j & ... Stator bearing -6...
Gear mechanism X...Stator drive machine 3θ...Drive machine shaft 3. ! ... Slip ring 3g ... Terminal box (excitation adjustment device) Patent applicant: Kawasaki Heavy Industries, Ltd. Fuji Electric Co., Ltd.

Claims (3)

[Claims] (1) In a shaft power generation device that generates alternating current power by driving an alternator having an excitation winding and an armature winding coupled to a variable rotation speed shaft, one of the excitation winding and the armature winding The winding is coupled to the variable rotation speed shaft to be rotationally driven, and the other winding is configured to be rotationally driven by a variable speed drive machine provided separately from the variable rotation speed shaft,
A two-shaft drive differential type shaft power generator, characterized in that the rotational speed of the other winding is differentially controlled with respect to the rotational speed of the one winding. (2) In the two-shaft drive differential shaft power generation device according to claim 1, one winding of the alternator that is rotationally driven by the variable rotation speed shaft drives the other winding. A two-shaft drive differential shaft generator that is controlled to maintain a constant relative speed depending on the machine. (3) In the two-shaft drive differential shaft power generation device according to claim 1, an induction machine is used as the alternating current generator, and the armature winding of the induction machine and the squirrel cage wire or the winding wire A two-shaft drive differential shaft generator configured to control the relative speed with the wheels.