JPH0732559B2 - Multi-phase armature winding - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a multi-phase armature winding configured as a fractional slot winding.

[Technical background of the invention] As is well known, there are three types of armature windings in a multi-phase AC rotating machine, that is, lap winding, wave winding, and chain winding. These are appropriately selected according to the type and characteristics of the rotating machine. It has been selected. Also,
Regarding the relationship with the number of slots of the armature core, there are integer slot winding in which the number of slots corresponding to each pole is an integer and fractional slot winding in which it is a non-integer or fraction, and both are widely adopted. Of these, the fractional slot winding has a large degree of freedom in design and can improve the voltage waveform, and thus is used for a rotating machine having a relatively large number of poles.

Now, for example, the conventional coil arrangement of fractional slot winding with three phases, six poles, and 45 slots has been configured as shown in FIG. In the figure, the U-phase winding is shown by a solid line, the V-phase winding is shown by a dot-dash line, and the W-phase winding is shown by a broken line, and the numbers 1 to 45 indicate slot numbers. Speaking of the U-phase winding, this is ₃ of U ₁ , U ₃ , and U ₅ .
It is composed of one single coil and three two continuous coils U ₂ , U ₄ , and U ₆ , and each coil is connected in series between terminals U and X. Here, the single coil means one coil of a plurality of turns mounted in the same slot pair, and the two continuous coils mean one in which two single coils arranged concentrically are connected in series. The other V-phase and W-phase windings have the same configuration, and are located 120 ° and 240 ° apart from the U-phase winding in electrical angle, respectively.

[Problems of background art] By the way, in this kind of rotating machine, for example, from 400V to 20
It may be necessary to connect the coils in parallel to convert the specifications for 0V. In this case, in the conventional armature winding, as shown in FIG. 5, a single coil, a series coil group of two continuous coils and a single coil, and a series coil group of two continuous coils, a single coil and a two continuous coil are provided. A configuration in which they are connected in parallel is conceivable. However, in this case, the total number of turns of each series coil group is not equal, and the magnetomotive forces at each branch are unbalanced, so circulating current occurs, causing overheating / burning of the coil, which makes it practically useable. Absent.

[Object of the Invention] The present invention has been made to eliminate the above-mentioned drawbacks, and an object of the present invention is to provide a multi-phase electric machine capable of forming a balanced parallel circuit even with a chain winding having an odd number of slots per phase. To provide the child winding.

SUMMARY OF THE INVENTION The present invention provides a fractional slot winding in which the number of slots of each pole and each phase is represented by a + (c / b) (a is an integer of 2 or more) and the number of slots of each phase is an odd number. In addition, one pole pair of each phase is formed by a + 1 coils, and each phase winding is configured by alternately arranging a single coil and a continuous coil in which a coils are connected. A single coil and a continuous coil forming a pair are composed of two split coils each having 1/2 the number of turns of the other pole pair, and each split coil is connected to each parallel shunt separately. Is characterized in that the total number of turns of each parallel shunt and the voltage vector are balanced.

[Embodiment of the Invention] An embodiment in which the present invention is applied to a rotary machine of fractional slot winding having three phases, six poles and 45 slots will be described with reference to Figs.
It will be described with reference to the drawings. In FIG. 1, only the U-phase winding is shown for the sake of clarity of explanation, but the V-phase winding and the W-phase winding are arranged in the same pattern separated by 120 ° in electrical angle. The numbers in the rectangular frame in FIG. 1 are the slot numbers of the armature core.

First, since the armature core has 45 slots, the number of slots for each pole and each phase is 45 / (3 × 6) = a + (1/2); a = 2, and the number of slots for each phase is 45/3. = An odd number of 15. Then, U-phase winding is composed of three single-coil U _1, U _3, U ₅ and three 2 consecutive coils U _2, U _4, U ₆ Prefecture. Here, the single coil means one coil of a plurality of turns mounted in the same slot pair, and the two continuous coils mean one in which two single coils arranged concentrically are connected in series. Therefore, the U-phase winding and thus the angular-phase winding are composed of 3+ (3 × 2) = 9 coils, and there are 6 poles, that is, 3 pole pairs. It is composed of a + 1 coils. Each single coil has a slot pitch of 6, each of the two continuous coils has an inner peripheral side having a slot pitch of 5, and the outer peripheral side has a slot pitch of 7, and the single coil and the two continuous coils are arranged alternately. The order is U ₁ , U ₂ , U ₃ , U ₄ , U ₅ , U ₆ . And, of the single coil and the two continuous coils,
U ₃ and U ₄ , which form one pole pair in the center, are two split coils U ₃ a, U each of which has 1/2 the number of turns of the other pole pairs.
_It consists of ₃ b and U ₄ a and U ₄ b. That is, the single coil U ₁ ,
The number of turns n is the number of turns n for the outer peripheral side of U ₅ and the two continuous coils U ₂ , U _6.
The number of turns of the split coils U ₃ a, U ₃ b and the split coils U ₄ a, U ₄ b on the outer peripheral side is n / 2. Also, 2 continuous coils U
_The number of windings on the inner peripheral side of ₂ and U ₆ is n ′, and the split coils U ₄ a and U ₄
The inner radius of b is n '/ 2. Where n'is (n /
2) An integer represented by ± α (α is an integer including 0).

In the above configuration, for example, due to a specification change from 400V to 200V, parallel connection may be performed as shown in FIG. If connected in this way, the series coil group of each parallel shunt
The number of coils in A and B is the same, and the total number of turns is 3 for each shunt.
It becomes n + (3n '/ 4) and becomes equal. In addition, the total number of turns of each series coil group A and B is not only equal in arithmetic total, but as shown in FIG. 3, the voltage vector of the series coil group A and that of the series coil group B are equal to each other. It becomes the same vector as the voltage vector. Therefore, the magnetomotive forces of the parallel shunts are balanced, and there is no possibility that an unnecessary circulating current will flow.
Incidentally, in FIG. 3, each vector is shown by adding a slot number subscript to the symbol e.

As described above, according to this embodiment, since the coils can be connected in parallel, the power supply voltage in the relationship of 1: 2, for example, 200 V
And can be shared for power supply voltage of 400V. That is, when the power supply voltage is 200V, double the circuit, for example, 2Y connection, and when the power supply voltage is 400V, a single circuit, for example,
1Y connection is enough. Also, by adopting a double circuit at 200V, when modifying for 400V, you can change the coil connection without rewinding the armature winding, that is, from 2Y.
It can be modified simply by changing the connection to 1Y, and can be dealt with in a short time and economically.

[Effects of the Invention] As described above, the present invention is characterized in that a coil forming one pole pair is composed of two split coils each having 1/2 the number of turns of the coil forming another pole pair. With this, the coils can be connected in parallel with each branch balanced by a simple connection change, which makes it extremely easy to deal with double voltage and remodel to different power supply voltage. It has an excellent effect that it can be done.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention, FIG. 1 is a development view of U-phase winding connection, FIG. 2 is a connection diagram of parallel connection, and FIG. 3 is a U-phase voltage vector diagram. FIG. 4 is a developed view of an arrangement of windings showing a conventional example, and FIG. 5 is a connection diagram of the parallel connection. In the drawing, U ₁ , U ₃ , and U ₅ are single coils, U ₂ , U ₄ , and U ₆ are two continuous coils, and U ₃ a, U ₃ b, U ₄ a, and U ₄ b are split coils.

Claims (1)

[Claims] 1. The number of slots for each pole and each phase is a + (c / b) (a
Is a fractional slot winding in which the number of slots in each phase is an odd number, and one pole pair of each phase is formed by a + 1 coils, and each phase winding is In a configuration in which a single coil and a continuous coil in which a coils are connected alternately are arranged, the number of turns of the single coil that forms one pole pair and the continuous coil that is half that of other pole pairs A multi-phase armature winding characterized in that it is composed of two split coils each.