JPS5822957B2 - Armature winding of rotating electrical machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a Sanwa-type Cyrisk motor that is operated by receiving power from a power supply in combination with a rectifier conversion device using Cyrisk such as an inverter, or a power supply to a load via a rectifier conversion device. Regarding the armature winding of rotating electric machines, such as alternating current generators, which are used in combination with a rectifier converter connected to the armature winding, the purpose is to control the square wave current containing harmonic components flowing through the armature winding. The objective is to eliminate or significantly reduce the pulsating torque generated due to the

A thyristor motor is shown in FIG. 1 as an example of the above-mentioned rotating electric machine.

In the figure, 1 is a motor serving as a synchronous machine, 2 is a three-phase power supply circuit, and the armature winding 3 of the motor 1 is connected to be supplied with power from the power supply circuit via a rectifier conversion device 4 consisting of a well-known converter/inverter. ing.

In such a rotating electric machine, the armature current waveform becomes a discontinuous square wave due to the rectifying element in the rectifier conversion device 4 and the smoothing reactor of the DC circuit.

As is well known, such discontinuous square waves have 6′? waves with different frequencies in addition to the fundamental wave, as revealed by Fourier series analysis. ±
It contains many harmonic components of the 1st (however, f: 1, 2...) order, and among these, the components that occupy a particularly large proportion are the 5th, 7th, 11th, and 13th harmonics. These are harmonic components such as

That is, in addition to the fundamental current of frequency f, the harmonic current flows through the armature winding.

Among the rotating magnetic fields generated by the current of such harmonic components, rotating magnetic fields such as the 5th and 11th harmonic components φ5゜φ
11 is in the opposite phase order to the rotating magnetic field φ1 due to the fundamental wave and rotates in the opposite direction.

On the other hand, the rotating magnetic field φ7.
φ13 has the same phase order as the fundamental wave and rotates in the same direction.

Therefore, the fifth-order and seventh-order rotating magnetic fields φ5. The relative speed of φ7 is 6f, and the 11th and 13th rotating magnetic fields φ11゜φ
The relative speeds of 13 are all 12f, and as a result, pulsating torques of 6f and 12f are generated in the rotating electric machine.

In this way, high-order harmonic components generate pulsating torque with a frequency of 6Pf.

Such pulsating torque can be an effective torque only by causing vibration of the shaft of the rotating electric machine.Therefore, when resonance occurs, there is a risk of damage to structural parts, so generation of pulsating torque should be prevented as much as possible. It is hoped that

In view of this, we have adopted a multiple inverter method, which has been known for a long time, as a measure to improve voltage waveforms, and connect multiple sets of divided windings of the armature configured as multiple windings to this multiple inverter to reduce harmonics. A method has been attempted in which the rotational magnetic field of the component is eliminated or reduced to prevent or greatly reduce the generation of pulsating torque that is an integral multiple of 6f.Reduction of pulsating torque by combining with a 6th-order multiplex inverter An example of an armature winding of a rotating electric machine designed to achieve this will be described with reference to the figure.

FIG. 2 is a wiring diagram of an armature winding showing an example of a conventional method. In the figure, armature winding 3 is a three-phase winding TJA.

A first A-divided winding consisting of V, , WA, and a three-phase winding UB
, VB, WB, and similarly U.

, Vo, Wo, the third C-divided winding, UD, VD,
It is composed of four sets of divided windings including a fourth D-divided winding made of WD.

In the illustrated example, the divided windings of each set are star-connected, but they may be delta-connected.

The first to fourth divided windings of A, B, C, and D are
With the divided winding as a reference, each of the divided windings B, C, and D spatially advances by αAB = 15°, αAc-30°, and αAD = 45° in electrical angle in the advancing direction of the rotating magnetic field of the fundamental wave. The winding device is installed in a relative position.

Moreover, each divided winding is connected in parallel to the power supply 2.
The rectifier converter device 4 is connected to receive electric power individually from the base rectifier converter device 4.

On the other hand, in each rectifier converter 4, by control angle phase control, with respect to the A-divided winding, the B, C, and D divided windings are temporally θAB-15° and θAC-
It is determined that a voltage with a phase delayed by 30° and θAD=4.5° is applied.

Note that A, B, and C in the illustrated example. D Turn ratio of each divided winding WA: wB: WC: WD = 1:1:1
:1.

According to the above configuration, the electrical angle is 15° spatially.

For each of the first to fourth divided windings A, B, C, and D with a relative phase difference of 300.45°,
15° and 30° based on the fundamental wave.

Currents of each harmonic component whose phase is shifted by 45 degrees will flow.

Therefore, each split winding has a fifth order. 7th, 11th, 1st
Tertiary and higher order rotating magnetic fields are generated.

Therefore, the vector diagrams of the rotating magnetic field of each harmonic are as shown in FIGS. 3a, b to 6a, b.

That is, with respect to the rotating magnetic field φ5A due to the fifth-order component whose phase order is opposite to the fundamental wave, φ5C has a spatial phase difference α as shown in FIGS. 3a and 3b.

In addition to -30°, there is a delay of time phase difference θ x 5-150°, so the phase difference between φ5A and φ5C is 180°.

Similarly, between the B-divided winding and the D-divided winding, φ5B and φ5
In D, the total of the spatial phase difference and the temporal phase difference is 180°.

On the other hand, for a rotating magnetic field due to the 7th order component whose phase order is the same as the fundamental wave, as shown in Figure 4 a and b,
, φ7A, φ7C, φ7B between the D-divided windings, respectively.
and φ7D have a phase difference of 180°.

Note that the rotational direction of the seventh-order component of the rotating magnetic field is opposite to that of the fifth-order component, and the spatial phase difference and the temporal phase difference are added in opposite directions.

Similarly, for the 11th and 13th rotating magnetic fields, <A,
φ11A and φ11B, φ11C and φ11D1, and φ13A and φ1 between the B-divided winding and between the C and D-divided windings.
3B1 The phase difference between φ13C and φ13D is 18 each.
It becomes 0°.

Moreover, the turns ratio of each divided winding is equal, so the 5.7th,
11. The 13th order rotating magnetic field disappears.

Further, higher harmonic components are also canceled out by each divided winding in the same manner as described above.

As a result of the above, 6v out of the high frequency rotating magnetic field of (62±1)f
Figure 3 when G is an odd number at ±1.

Small □-1 as shown in Figure 4.

, φB-<'D, and 1 is an even number and? = 4 n
Figure 5 if +2.

As shown in Fig. 6, φ□-(I's, <6°--a.

becomes. This prevents the generation of pulsating torques such as those at frequencies 6f, 12f, and 18f.

In addition, as mentioned above, since the high frequency rotating magnetic field is eliminated, the copper loss and iron loss of the rotating electric machine are also reduced, and the efficiency is improved.

By the way, in the method shown in FIG. 2 described above, each of the armatures A, -
The distance between the D-divided windings is 15° and 30° with respect to the fundamental wave.
In order to set a time phase difference of 45° and 45°, four rectifier converters are required, which corresponds to the number of divided windings, making the overall equipment cost extremely high. There are disadvantages.

Further, in the rotating armature type, a total of 12 slip rings are required as external lead-out terminals drawn out from the armature winding 3.

The present invention has been made in consideration of the above points, and its purpose is to develop a system in which the multiplex inverter shown in Fig. 2 is adopted by devising the interconnection of the divided windings of the armature, and by utilizing the clever interconnection method. In comparison, an object of the present invention is to provide an armature winding for a rotating electrical machine that can cancel out the rotating magnetic field of harmonic components and greatly reduce pulsating torque by simply combining it with one rectifier converter.

This object is achieved by the present invention, in which the armature windings are divided into first . Second. Third. The fourth set is composed of four divided windings, and the second divided winding is connected to the first divided winding. The third and fourth divided windings are each spatially 15° electrical angle,
The winding devices are placed at relative positions advanced by 30° and 45° to set a spatial phase difference between each divided winding, and
Between the external lead-out terminals of the armature winding that connects to the rectifier converter, each phase winding of the first divided winding is connected in a delta connection, and each phase winding of the third divided winding is connected in a star configuration. In addition to connecting in parallel, the second and fourth divided windings are connected to the first divided winding at approximately 1 volts with respect to the fundamental wave.
one end of each phase winding is connected to an external lead-out terminal connected in parallel to the first divided winding and the third divided winding so as to set a time delay phase difference of 5° and 45°; This is achieved by configuring the other end as a three-phase winding connected to a midway point of the phase winding of different phases in the third divided winding.

Embodiments of the present invention will be described below based on the drawings.

In FIG. 7, each armature winding 3 is a three-phase winding U.
A~ consisting of A, ■E, WA..., UD, vD, and WD.
It is composed of divided windings of D4 silk, and these four sets of divided windings are interconnected between external lead-out terminals U, V, and W in the manner shown in the figure.

That is, the first divided winding is a three-phase winding, UA. It is a delta-connected A-divided winding consisting of vA and WA, and the third divided winding is a star-connected three-phase winding connected in parallel with the A-divided winding between terminals U, V, and W. Uc,■c,
It is a C-divided winding made of Wo.

On the other hand, the second. As shown in the figure, the fourth divided winding is a three-way winding connected between the terminals U, V, and W and the midpoint of the phase winding on the different phase side, which is different from the terminal phase in the C-divided winding. Phase winding UB, vB.

The windings are divided into C and D for WB, UD, VD, and WD.

With this connection, A and C are connected in delta connection and star connection.
A time delay phase difference θ□, −30° is set between the divided windings and the divided windings with respect to the A divided windings.

In addition, by appropriately selecting the intermediate connection point on the C-divided winding of the B- and D-divided winding, B and C can be connected to the A-divided winding.
Time delay phase differences θ shoulder=15° and θAD−45° are set between the divided windings and the fundamental wave, respectively.

In addition, when actually winding the winding around the iron core, if it is not possible to set θAB = 15° and θAD - 45° strictly due to constraints on the winding configuration, values close to 15° and 45° may be used. Just set it so that you can get it.

Furthermore, A, B, and C. D There is a spatial phase difference αAB-15°, αAc=30°, α between each divided winding as in FIG.
The divided windings are wound on the core at relatively shifted positions so that AD=45° is set.

Here, the turns ratio of each divided winding A, B, C, D is WA:WB
:WC:WD-V'T: 1.22: 1:1.2
If 2 is selected, the strength of the rotating magnetic field generated in each divided winding will be the same, thus making it possible to eliminate the rotating magnetic field of the (6?±1)th harmonic component as in FIG.

In addition, even if it is not possible to select the turns ratio of each divided winding to the above value due to the designed winding configuration and conditions, by selecting a value close to that value, it is possible to significantly reduce the high frequency rotating magnetic field and therefore the pulsating torque. can.

As described above, according to the present invention, there is no need to employ multiple inverters as described in FIG. The rotating magnetic field of the harmonic components of is skillfully canceled out between the divided windings, and is eliminated or greatly reduced, producing an excellent effect of suppressing the generation of pulsating torque at frequencies of 6f and integral multiples of 6f. It will be done.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of a thyristor motor shown as an example of a rotating electric machine to which the present invention is applied, Fig. 2 is a wiring diagram of an armature winding showing an example of a conventional system, and Figs. 3 a, b to 6 Diagram a
, b is a vector diagram for explaining the rotating magnetic field canceling operation of harmonic components, and FIG. 7 is a wiring diagram of an armature winding showing an embodiment of the present invention. 1... Rotating electric machine, 2... Power supply circuit, 3... Armature winding, 4... Commutator conversion device, UA, ■i, WA...
・First divided winding, UB, VB, WB...Second divided winding, U■o, Wo...Third divided winding, Ul), VD, W
D-...Fourth divided winding, α. , α. , αAD...Spatial phase difference, θ.

Claims (1)

[Claims] 1. The armature windings of a rotating electrical machine operated in combination with a rectifier converter are arranged spatially at a certain angle from each other. Second. Third. Consisting of a fourth set of four divided windings,
In a device in which each set of divided windings is energized with a temporal phase difference between them based on the fundamental wave, the four sets of divided windings constituting the armature winding are spatially connected to the first 2nd for split winding. Third. The fourth divided windings are arranged at relative positions advanced by 15 degrees, 30 degrees, and 45 degrees in electrical angle, and the first divided winding is configured as a delta type connection, and the third divided winding is configured as a star type connection. are connected in parallel, and the second
The divided winding and the fourth divided winding are connected to the first
One end of the second divided winding and the fourth divided winding are connected to the first divided winding and the third divided winding so as to set a time delay phase difference of approximately 15° and 45° with respect to the divided winding, respectively. A rotating electric machine characterized in that it is configured as a three-phase winding in which the winding is connected to a lead-out terminal of each phase connected in parallel with the winding, and the other end is connected to a midway point of a third divided winding of a different phase. Child winding.