JPS6223339A - Polyphase armature windings - Google Patents

Abstract

PURPOSE:To enable coils to be connected in parallel in an equilibrium of each branch by composing a coil constituting a polar couple of two split coils each having half the number of turns of winding of ones constituting other polar couples respectively. CONSTITUTION:In a U-phase winding of a rotating machine of distributed slot winding for three phase, 6 poles and 45 slots, the U-phase winding is composed of three single coils U1, U3 and U5 and three dual continuous ones U2, U4 and U6. The single coils and the dual continuous ones are arranged alternately. Among those single coils and dual continuous ones the coils U3 and U4 constituting one central polar couple are respectively composed of two split coils U3a and U3b and U4a and U4b respectively having half the number of turns of coils constituting the other polar couples.

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to polyphase armature windings configured as fractional thrower one-windings.

[Technical Background of the Invention] As is well known, there are 3FJ types of armature windings in multiphase AC rotating machines: lap winding, wave winding, and chain winding, and these can be changed as appropriate depending on the type and characteristics of the rotating machine. Selected. In addition, in relation to the number of slots in the armature core, there are two types: integer slot winding, in which the number of slots per pole is an integer, and fractional slot winding, in which the number of slots is an integer, that is, a fraction, and both are widely used. has been done. Of these, the fractional slot 51 is
Since it has a large degree of freedom over 1 and can produce a good voltage waveform, it is particularly adopted in rotating machines with a relatively large number of poles.

Now, for example, the conventional coil arrangement of fractional slot winding, which has three phases, six poles, and 45 slots, employs a chain winding method and is conventionally constructed as shown in FIG.

In the figure, the 010 winding is a solid line, vl (the 1st winding is a dashed line,
The W-phase windings are indicated by broken lines, and the numbers 1 to 45 indicate slot numbers. Here, speaking of the U1f'1 winding, it consists of 34 single coils Ul, U3, and IJs, and three 2) superimposed coils, L12, U4, and U6, and each coil are connected in series between terminals U and X. Here, a single coil refers to one coil with multiple turns installed in the same pair of slots,
A two-continuous coil is one in which two single coils arranged concentrically are connected in series. The other V and W phase windings have a similar configuration, and the U phase winding is 1 electrical angle.
They are located 2o° and 240' apart.

[Problems with Background Art] Incidentally, in this type of rotation compensation, it may be necessary to connect coils in parallel in order to convert the specification from, for example, 400V to 200V. In this case, the conventional one-lever winding has a single coil, two continuous coils, and a single opening, as shown in FIG. A 1M configuration is considered in which a series coil group of coils, a coil group, and a series coil group of two continuous coils, a single coil, and two continuous coils are connected in parallel with each other. However, in this case, the total number of turns of each series coil group is not equal, and the magnetomotive force of each branch becomes unbalanced, which causes circulating current, which can cause coil overheating and
This causes burnout, etc., and the bottom cannot be put to practical use.

[Object of the Invention] The present invention was made to eliminate the above-mentioned drawbacks, and its purpose is to provide a 1/1-turn winding with an odd number of slots in each phase.
The object of the present invention is to provide a polyphase armature winding that can be configured into eight balanced parallel circuits.

[Summary of the Invention] The present invention provides a method in which the number of in-phase slots for each pole is a+(c,'b)(
a is an integer greater than or equal to 2), and is a fractional slot winding in which the number of throwers 1 for every n phase is an odd number, and a+1 coils form one pole pair for each phase, and Is the phase winding connected to a single coil and an allp coil? ! In the case where continuous coils are arranged alternately, the 111 coil constituting one pole pair and the continuous coil are each made of two divided coils with half the number of turns of those constituting the other pole pair. The main feature is that each divided coil is divided into parallel shunts and connected so that the total number of turns and voltage vector of each parallel shunt are balanced.

[Embodiment of the Invention] Hereinafter, an embodiment in which the present invention is applied to a rotating machine with fractional slot winding having three phases, six poles, and 45 slots will be described with reference to FIGS. 1 to 3. In FIG. 1, only the U-phase winding is shown for clarity of explanation, but the V-phase winding and the W-phase winding are arranged in the same pattern, separated by 1200 electrical degrees.

Further, the numbers written within the rectangular frame in FIG. 1 are the slot numbers of the N machine armature core.

First, since the armature core has 45 slots, the number of slots for each pole and each phase is 45% (3x6) = a + (1z'2):
a=2, the number of slots in each phase is 45, '3=15
is an odd number. And the UK4 winding consists of three single coils U
1. U3, Us and three two-continuous coils U2, U4
, Us. Here, a single coil refers to one coil with multiple turns installed in the same pair of slots, and a two-continuous coil refers to a coil formed by connecting two concentrically arranged single coils in series. ``Therefore, the U phase winding and each phase winding is 3+ (3X2) = 9117J
Since there are six poles, that is, three pole pairs, one pole pair of each phase is composed of 9, / 3 = 3, or a+1 coils. Each single coil has a slot pitch of 6, and the inner circumferential side of each two continuous coils has a slot pitch of 5, and the slot pitch of the outer circumference side has a slot pitch of 7, and the single coils and two continuous coils are arranged alternately. , L.J.l., U.
z, LJ:s, Ua, Ub, tJr,
The order is as follows. Of the single coil, coil, and two continuous coils, U3 and U4, which constitute one pole pair in the center, are each two divided coils IJ3a with half the number of turns of those constituting the other pole pair. (J3b and (Jaa, tJ
It is composed of abh days. That is, single coil U1. Us
The outer peripheral side of the two continuous coils U2 and U6 has the number of turns n, and is a divided coil IJ3a.

The number of turns of the coils U31) and the outer peripheral side of the split coils U4a and U4b is n7/2. Further, the inner circumferential side of the two continuous coils U2 and U6 has the number of turns n', and the divided coil Ui3. The inner peripheral side of LJtb is n'7/2. Here, n- is an integer expressed as (n,,'2)±α (α is an integer including O).

In the above configuration, if the specifications are changed from 400V to 200V, for example, in order to connect them in parallel, it is sufficient to connect them as shown in FIG. When connected in this manner, the numbers of coils in the series coil groups A and B of each parallel branch are equal, and the total number of turns is 3n+(3n-,/4) for each branch, making them equal. Therefore, as shown in FIG. 3, the total number of turns of each series coil group A and B is not only equal to each other in the n-term sum h1, but also as shown in FIG. 3, the voltage vector of series coil group A and
The voltage vector of series coil group B is the same vector. Therefore, the magnetomotive force of each parallel shunt is balanced, and there is no possibility that unnecessary circulating current will flow. In addition, in FIG. 3, each solid one hell is not shown by adding a subscript of the slot number to the symbol e.

As described above, according to this embodiment, since the coils can be connected in parallel, the power supply voltage in a 1:2 relationship, for example, 2
It can be used in common for power supply voltages of 00V and 400V. That is, when the power supply voltage is 200 V, a double circuit, for example, a 2Y connection, is used, and when the power supply voltage is 400 V, a single circuit, for example, a 1Y connection, is used. Also,
By adopting twice as many circuits as 200■, 40
When modifying for 0V, the modification can be done simply by changing the connection of the coil, that is, from 2Y to 1Y, without rewinding the armature winding, which can be done in a short time and economically. I can do it.

[Effects of the Invention] As described below, the present invention is characterized in that each coil constituting one pole pair is composed of two split coils each having half the number of turns of the coil constituting the other pole pair. This feature allows coils and coils to be connected in parallel with each branch balanced by a simple connection change, making it extremely easy to support dual voltages and modify to different power supply voltages. It has the excellent effect of being able to be used in a variety of situations.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention, FIG. 1 is a connection diagram of the U-phase winding, and FIG. 2 is a diagram of the connection of the U-phase winding. FIG. 3 is a diagram of the U-phase voltage, FIG. 4 is a developed winding arrangement diagram showing a conventional example, and FIG. 5 is a wiring diagram of the same parallel connection. In the drawing, Ul, U3, Us are single coils, U21LJ
4. LJs are 2M continuous cocoil LJ3a, U3b, LJ4
a, U41+ are split coils. X Figure 2 Figure 3

Claims (1)

[Claims] 1. A fractional slot winding in which the number of slots per pole and each phase is expressed as a + (c/b) (a is an integer of 2 or more), and the number of slots per phase is an odd number, One pole pair of each phase is formed by a coil, and each phase winding is configured by alternately arranging a single coil and a continuous coil in which a number of coils are connected. A polyphase armature winding characterized in that the continuous coil is constituted by two divided coils each having half the number of turns of those constituting the other pole pairs.