JPS63213435A - Three-phase armature winding - Google Patents

Abstract

PURPOSE:To decrease vibration in operation and enable smooth starting by constituting a coil group forming a winding for one phase with series connections of coils detached from each other by 2npi of an electrical angle. CONSTITUTION:If attention is given to a U-phase winding, said winding is composed of a total of four coils U1-U4. Then, two coils U1, U3 detached from each other by 2npi (n is an arbitrary natural number) of an electrical angle are connected in series to constitute a first coil group UA and terminals U1, X1 are provided at both ends of said first coil group UA. Also, two coils U2, U4 detached from each other by 2npi of an electrical angle are connected in series to constitute a second coil group UB which is provided with terminals U2, X2 at both ends. In this manner, a mag-netic in imbalance around a whole stator is improved and vibration in operation can be decreased. Further, lowering of torque in a low speed region decreases to enable a smooth starting.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention consists of a winding for one phase consisting of a plurality of coil groups, and can handle a plurality of voltages by changing the connections of the coil groups. Regarding the three-phase armature winding.

(Prior Art) Being able to handle a plurality of voltages with a single armature winding is desirable because it increases the degree of freedom in the application of a rotating electric machine, so various configurations have been provided heretofore. As an example, FIG. 8 shows a winding layout diagram of a device with 4 poles and 24 slots. Here, each phase winding is composed of a total of four coils, and two coil groups each constitute a first and a second coil group. For example, 4
The two coils are U1 to U4, and the first coil group is Ua,
Assuming that the second coil group is Ub, the first coil group Ua is composed of the coils Ul % U2 which are located at the anodes of each other, terminals U1 and Xl are formed at both ends, and tr3 and U which are also located at the anodes of each other. , constitutes a second coil group Ub, and terminals U2 and X2 are formed at both ends. The other V and W phases are exactly the same, and in the end, each phase has two windings.
It is composed of coil groups Ua, Ub, Va, Vb, Wa, and Wb, and each of these coil groups is composed of two anode-connected coils. The windings having such a configuration are shown for each phase as shown in FIG. 7, and by connecting them as shown in Table 1 below, it is possible to correspond to three types of voltages. In Table 1, in the "low voltage" connection, two coil groups of each phase are connected in parallel between the lines, and in the "medium voltage" connection, two coil groups of each phase are connected in series between the lines.
In the "high voltage" connection, a total of three coil groups are connected in series, including one coil group of a different phase between the lines, and the voltage ratio is eventually calculated from the vector value to be 1:272.5.

(Problem to be solved by the invention) However, the above conventional armature winding is
When the engine is connected, there is a problem that the torque drops in the low speed range, resulting in a lack of smooth startup and large vibrations during operation. An investigation into the cause revealed that the magnetomotive force distribution in the "high voltage" connection state was unbalanced. That is, the magnetomotive force distribution diagram of only the U-phase winding in the "high voltage" connection state is shown in Figure 9, with 1.0 for the U-phase winding and 10, 5 for the V- and W-phase windings. Examining the overall magnetomotive force distribution when a current corresponding to . Vibration occurs due to such magnetic imbalance, and since this distribution includes low-order harmonics (corresponding to the number of poles of 6 and 12 poles), this distribution causes vibrations in the low-speed range. This is the cause of torque abnormality.

Therefore, an object of the present invention is to provide a device having four or more poles, in which the winding for one phase is composed of a plurality of coil groups, and which can handle multiple voltages by changing the connections of the coil groups. An object of the present invention is to provide a three-phase armature winding that can be started smoothly even in a connected state corresponding to high voltage, and can reduce vibrations during operation as much as possible.

[Structure of the Invention] (Means for Solving the Problems) The three-phase armature winding of the present invention has a number of poles of 4 or more, and 1
The windings for the phases are composed of a plurality of coil groups, and the coil groups can be connected to each other to correspond to a plurality of voltages, and each coil group has an electrical angle of 2n
The feature is that the coils are connected in series, separated by π (n is a natural number).

(Function) Since a common current flows through the coils that are separated by 2nπ in electrical angle and make up the same coil group, the magnetic balance is improved over the entire circumference, reducing magnetic imbalance and reducing low-order harmonics. becomes smaller.

(Example) Hereinafter, a first example of the present invention will be described with reference to FIGS. 1 to 3.

This first embodiment is an example of 4 poles and 24 slots, and the winding arrangement is as shown in FIG. In the same figure, 1 to
Reference numeral 24 indicates a slot number, a solid line indicates a U-phase winding, a broken line indicates a V-phase winding, and a dashed line indicates a W-phase winding, following the same description system as the conventional example shown in FIG. Here, if we pay attention to the U-phase winding, it is composed of a total of four coils U1 to U4. Coil U1 is housed between the slots numbered 1 and 6, and coil U2 is housed between the slots numbered 7 and 12. The coil U, which is stored between the slots, is numbered 13.1.
The coil U4 is housed between slots numbered 19.24.

Then, two coils Ul and U are separated by 2nπ (n is any natural number, and is set to 1 in this example) in electrical angle.
3 are connected in series to form a first coil group UA, and terminals Ul and Xi are provided at both ends of the first coil group UA. Also, two coils U2. U4 is connected in series to constitute a second coil group UB, and terminals U2 and X2 are provided at both ends. Here, when compared with the conventional example shown in FIG.
The phase winding is composed of four coils U1 to U4, and
It is the same as the conventional example in that the first and second coil groups are each made up of two coils, but in the conventional example, each of the first and second coil groups Ua and Ub has two coils connected to anodes. In contrast, the first and second
The coil groups UA and UB are different in that they are constructed by connecting coils (Ul and U3+U2 and Ua) in series that have a positional relationship of 2π in electrical angle. On the other hand, each of the V-phase and W-phase windings is constructed in the same way as the U-phase winding, with the V-phase winding being located at an electrical angle of 2/3π shifted from the U-phase winding, and the W-phase winding being located at its V-phase winding. It is also located 2/3π out of electrical angle from the phase winding.

Further, the terminals of each coil group are arranged evenly around the entire circumference of the stator. Specifically, terminal U1. Zl.

Z2. V2 is provided at positions corresponding to slots numbered 1 to 4, respectively, and terminals Wl, Yl, Y2 . 'U2 are provided at positions corresponding to slots numbered 9 to 12, respectively, and terminals Vl, X1 . X2. W2 is provided at positions corresponding to slots numbered 17 to 20, and each terminal group is evenly spaced at angular intervals of 120° around the entire circumference of the stator.

Now, in the three-phase armature winding configured as above, the first
The waveform of the magnetomotive force generated only in the U-phase winding when the connection is “r high voltage” in the table is shown in Figure 2.
When a current corresponding to -0,5 flows through the V-phase winding and the W-phase winding, the overall magnetomotive force waveform is as shown in FIG.

According to this, the magnetomotive forces in the slots numbered 1 and 13 or 7 and 19, which are spatially symmetrical at 180°, have the same strength and are balanced over the entire circumference of the stator. It is clear that there are Therefore, Figures 9 and 1 show the magnetomotive force waveforms of the conventional configuration under the same conditions.
There is no need to wait for a comparison with Figure 0. The magnetic unbalance around the stator is improved, and vibrations during operation can be reduced accordingly.

In addition, this magnetomotive force distribution has fewer low-order harmonic components corresponding to 6 poles and 12 poles than those in Figures 9 and 10.
Therefore, the drop in torque in the low speed range is reduced, allowing smooth starting.

FIG. 4 is a winding arrangement diagram showing a second embodiment of the present invention,
This is an example of 6 poles and 36 slots.

In this case, the U-phase winding is composed of six coils U1 to U, and the coils U1, U3, . U6 are connected in series to form the first coil group U.
A is constructed, and terminals U1 and Xl are provided at both ends. Also, the remaining coils U are separated by 2π in electrical angle.
2, Ua + tr.

are also connected in series to form a second coil group UB, with terminals X2. U2 is provided. That is, the U-phase winding is composed of two coil groups UA and UB, a first and a second coil group, and each coil group UA.

This is similar to the first embodiment in that UB is constructed by connecting coils in series separated by 2π in electrical angle, and the remaining V-phase and W-phase windings are constructed in accordance with this. ing.

In the three-phase armature winding with such a configuration, the "
The magnetomotive force waveform created only by the U-phase winding in the case of "high voltage" connection is shown in Figure 5.
, the entire magnetomotive force distribution when currents corresponding to -0 and 5 flow through the V and W phases are as shown in FIG. In this case as well, the magnetomotive force is of the same strength at the spatially symmetrical position of 180'', so magnetic equilibrium is obtained over the entire circumference of the stator.In addition, there are few low-order harmonics, The generation of abnormal torque can also be suppressed.

It should be noted that the present invention is not limited to the above embodiments,
Various modifications can be made without departing from the scope of the invention, such as setting the number of poles to other than four or six poles.

[Effects of the Invention] As described above, the present invention provides an electrical 2 in the corner
Since each coil group is constructed by connecting coils in series that are separated by nπ (n is a natural number), the magnetomotive force distribution when high voltage is applied is balanced over the entire circumference of the stator. This has the excellent effect of reducing vibrations and reducing low-order harmonics, making smooth starting possible.

[Brief explanation of the drawing]

1 to 3 show a first embodiment of the present invention, FIG. 1 is a winding arrangement diagram, and FIG. 2 is a U
The magnetomotive force waveform diagram of the phase winding, Figure 3 is the magnetomotive force waveform diagram of the entire phase winding. 4 to 6 show the first embodiment of the present invention.
7 is a wiring diagram for explaining the connection state of the coil group together with Table 1, and FIG. 8 to 10 is a diagram equivalent to FIGS. 1 to 3 showing the conventional example. It is. In the drawing, UASUB represents the first and second coil groups, U1 to UASUB.
U6 is a coil. Applicant Toshiba Corporation Figure 1

Claims (1)

[Claims] In the case where the number of poles is 1, 4 or more, the winding for one phase is composed of a plurality of coil groups, and the coil groups can be connected to each other to correspond to a plurality of voltages, each of the coils A three-phase armature winding characterized in that a group is constructed by connecting coils in series separated by 2nπ (n is a natural number) in electrical angle.