JPS5984512A - Transformer coil for ac regenerative type electric vehicle - Google Patents

Abstract

PURPOSE:To realize energy saving of vehicles through increase in regenerated electrical power to electric apparatus such as an auxiliary machinery of vehicle without allowing increase in capacity of third coil by dividing the second and third windings into two parts and sequentially providing the third coil and second coil in both sides of the first coil. CONSTITUTION:A regenerated power to the third coil 3 from the second coil 2 can be increased by making smaller the reactance X3 of third coil and resistance R3 of third coil than the reactance X2 of second coil and resistance R2 of second coil. Meanwhile, voltage fluctuation of third coil can be kept constant by increasing the sums of the reactance X1 and resistance R1 of the first coil and the reactance X3 and resistance R3 of the third coil. As the layout of these coils, for example, the third coils 3 are arranged in both sides of the respective first coil 1, the second coils 2-1, 2-2 are sequentially arranged at the outside thereof, and the third coil 3 is provided in proximity relation to the first and second coils 2-1, 2-2.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a winding arrangement of a transformer, and in particular, a first winding that takes in power from an overhead wire and a first winding that supplies power to a motor for driving an electric vehicle. The present invention relates to a winding arrangement suitable for an AC regenerative vehicle transformer including two windings and a third winding that supplies power to electrical equipment other than the drive motor.

[Prior art]

Since the start of AC electrification and the practical use of thyristors, research into AC regeneration vehicles has begun.In AC regeneration vehicles, when applying the brakes, the motor for driving the electric vehicle acts as a full generator, causing the generation of This method obtains braking force by returning electricity to the power source. This method regenerates '1
If there is no load that can use the force effectively, braking force cannot be obtained, and the amount of regenerated electric power is also small, which negates the benefits. It was put into practical use only. In recent years, AC regenerative vehicles have been reconsidered from the perspective of stingray and energy resources.
However, the small amount of regenerated electricity is a major obstacle.

In general, an AC regenerative vehicle transformer consists of a first winding that takes in power from the overhead wire, a second winding that supplies power to the electric car drive motor, and electrical equipment other than the drive motor inside the electric car. The third winding supplies power to auxiliary equipment, heating, service power sources such as food trucks, etc. (electrical equipment with a capacity of 10 to 30% of the second winding capacity). When power is on, power flows from the first winding 1 to the second winding as shown by arrow 49 in Figure 1.
It is supplied to the winding 2 and the third winding 3, respectively. This is,
During regenerative braking, power is supplied from the second winding 2 to the first winding 1 and the third winding 3, respectively, as shown by arrows c and 2 in FIG. The amount of electric power regenerated through the first winding 1 will be small due to the impedance of the overhead wires and the impedance of the substation if there are no powered vehicles nearby or if it is far from the substation. I end up.

In addition, in the conventional winding arrangement, in order to reduce the voltage fluctuation rate of the third winding, the first winding 1 and the third winding 3 are arranged as shown in FIG.
The structure was such that they were placed close together.

Therefore, there is a drawback that the amount of regenerated electric power transferred from the second winding 2 to the third winding 3 during regenerative braking is small.

[Purpose of the invention]

An object of the present invention is to provide a winding arrangement 4 for a vehicle transformer that can increase regenerative power from the second winding to the third winding without increasing the voltage fluctuation rate of the third winding. There is something to do.

[Summary of the invention]

In order to prevent the voltage fluctuation height of the third winding from increasing, the present invention makes the first winding and the third winding close to each other, and to increase the regenerative power from the second winding to the third winding. , the second winding and the third winding also needed to be close to each other.

Therefore, the purpose is achieved by dividing the second winding and the third winding into two and sequentially arranging the third winding and the second winding on both sides of the first winding.

[Embodiments of the invention]

FIG. 4 is a diagram showing the circuit constants of this type of vehicle transformer winding. As is clear from this diagram, in order to increase the regeneration and torque from the second winding to the third winding, IJ' of the second winding
The third winding actance X3 and the resistance R3 of the third winding may be made smaller than the actance X2 and the resistance R2 of the second winding. In addition, in order to prevent the voltage fluctuation rate of the third winding from increasing, the first winding glue actance X1 and the resistance hole 11 of the first winding must be
And the sum of N3 and 几3 should not be increased. R1
, 几2゜R3 are generally very small compared to Xx, N2 + Xs, so the ability to control Xt, Xz, and Xs is advantageous. Just keep the size of the tab, Xt+Xa, as it is, and reduce N2 +Xs.

Next, the arrangement of each winding in the embodiment of the present invention will be explained while comparing it with the conventional one. 1. As shown in FIG. 5, the second winding 2 is divided into 2-1 and 2-2. The arrangement of each winding in this case is shown in FIGS. 3 and 6. As shown in FIG. 3, the conventional transformer rJJJ1 volume, 1iJ! 1 and 2nd winding 2
-1.2-2 are close to each other, but the third winding 3 is interposed between the first windings 1 and 1, and the second windings 2-1.2 and 1 are located close to each other.
-2 is far away. On the other hand, in the transformer according to the embodiment of the present invention, as shown in FIG.
The third winding 3 is arranged on both sides of the
-1.2-2 are arranged in sequence, and are in close proximity to KTJ 3-volume 3-volume set 3 winding 1 and 2nd winding 2-1.2-2.

Next, the current centrility actance (%IX) between each winding in the transformer shown in FIG. 3 is shown. %lXlA3 between the first winding and the third winding is determined by the following equation (1).

・・・・・・・・・ (1) Here, t, average length of the two windings N3. Number of turns h of the third winding: Radial width of the winding Δ1: Axial width of the first winding Δ3: Axial width of the third winding (see Figure 7) δ13
'The axial distance between the first and third windings is 13: Rogowski coefficient R3: No-load voltage of the third winding ■3: Rated current of the third winding Between the second and third windings %IX etc. are determined by the following formula (2).

xio-' ・・・・・・・・・・・・
(2) Here, Δ2 is the axial width of the second winding, and δ12 is the axial distance between the first winding and the second winding (see FIG. 7 for both). Note that although K4g varies slightly depending on the winding structure, it is treated as the same because it has little effect on the overall structure.

Next, the percent reactance between each winding in the transformer of FIG. 6 is shown. %IXr between the first and third windings
3 is the % between the second winding and the third winding according to formula (3) below.
IX:3 is determined by the following formula (4).

・・・・・・・・・(3) ・・・・・・・・・(4) Here, %IXs's of the above formula (1) and %■X of the formula (3)
Compare 8 Surtr, X I Xs'3 = X I x? s
To %IX of formula (2), (4
) of the formula %IX:3 as δI3! =;δ! 3, it can be seen that %IX#a>%IX:s.

From the above, in the transformer of the present invention, %lX13 is the same as that of the conventional transformer, and %lX23 is smaller.

Regenerative power from the second winding to the third winding can be increased without increasing the voltage fluctuation rate of the pick and the third winding.

In addition, FIG. 8 is a winding dimensional diagram of FIG. 6.

〔Effect of the invention〕

According to the present invention, the regenerative power from the second winding to the third winding can be increased without increasing the voltage fluctuation rate of the third winding, so the capacity of the third winding can be increased. Without this, the amount of regenerated power to electrical equipment such as auxiliary equipment in the vehicle increases, making it possible to save energy in the vehicle.

[Brief explanation of drawings]

Figures 1 and 2 are diagrams showing the direction of power supply during power and regeneration of an AC regenerative transformer, Figure 3 is a winding arrangement diagram of a conventional transformer, and Figure 4 is a diagram showing the direction of power supply in an AC regenerative transformer. Figure 5 is a diagram showing the circuit constants of the windings, Figure 5 is a connection diagram of an AC regenerative transformer, Figure 6 is a diagram showing the winding arrangement of the transformer of the present invention in Figure 4, and Figure 7 is the winding diagram in Figure 5. Line dimension diagram, FIG. 8 is a winding dimension diagram in FIG. 1... First winding, 2.2-1.2-2... Second winding, 3... Third winding. -2nd 1st (Kari Condolence 2 Zuto 3 Goods 1 2, -/

Claims (1)

[Claims] 1. The first winding receives power from the overhead wire, the second winding supplies power to the electric motor that drives the electric car, and supplies power to frost and dust equipment other than the drive motor inside the electric car. In the AC regenerative vehicle transformer, the third winding and the second winding are sequentially arranged on both sides of the first winding. Vehicle transformer winding.