JPS5989559A - Pole change 3-phase armature winding - Google Patents

Abstract

PURPOSE:To reduce the number of installing connecting terminals by continuously disposing coil group, forming a series circuit so that the winding directions of adjacent coils become reverse to each other and connecting in parallel or in series with each other these two series circuits. CONSTITUTION:The first coil group Ua1 is composed of a coil U1 wound between slot numbers 1-18, a coil U2 wound between slot numbers 2-17, and a coil U3 wound between slot numbers 3-16. On the other hand, the second coil group Ua2 is composed of coils U4, U5, U6 which are respectively wound between the slot numbers 19-36, between 20-35 and between 21-34. The second series circuit is formed by connecting the coils U1, U3, U5 to form the first series circuit, and connecting the coils U2, U5, U16 to become in reverse winding direction to the coils of the adjacent first series circuit. In the phases V, W, similarly connected, and connecting terminals X, U, X, Uo, Us, Vo, Vs, Wo, Ws are led.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a three-phase armature winding used in an AC rotating electric machine, and in particular, to a three-phase armature winding that is configured with a single winding and by switching connection terminals. This invention relates to a pole number conversion three-phase armature winding that can obtain two types of pole numbers.

[Technical background of the invention and its problems 3 When obtaining two types of rotation speeds, high speed rotation and 2-low speed rotation, with one AC rotating electric machine, the number of poles of the armature winding of the rotating electric machine must be changed. Sometimes I do.

A so-called □ pole number conversion three-phase armature winding that can convert the number of poles in this manner is generally configured as follows. In other words, if the pole number ratio between the number of poles corresponding to high rotational speed and the number of poles corresponding to low rotational speed is small, for example, 1:2, the three-phase armature winding is replaced by a single winding. It consisted of a connecting terminal that could be taken out to the outside at a midpoint of the winding. By cutting and replacing these connection terminals, 92 different numbers of poles were obtained.

On the other hand, if the pole number ratio is set to a large value, the number of connection terminals will increase and the wiring will become complicated if a single winding is used as described above. A three-phase armature winding was constructed using a set of windings.

However, the pole number changing three-phase armature winding composed of two windings has the following problems. That is, since two windings, one for high speed and one for low speed, are wound around one armature core, these windings must be electrically connected to each other. Therefore, the amount of insulation that must be inserted between the windings increases,
The space factor of the windings inside and outside the slot is reduced, and as a result, there is a risk that the rotational performance of the AC rotating electric machine will be reduced.

Furthermore, the windings for low speed rotation are not used during high speed operation of the AC rotating electric machine, while the windings for high speed rotation are not used during low speed operation, resulting in a low winding utilization rate. Therefore, there is a problem that the size, weight, etc. are increased compared to a single winding AC rotating machine having approximately the same rotational performance.

[Purpose of the invention]

The present invention has been made based on these circumstances, and its purpose is to provide a single winding of the armature winding even when the pole number ratio between high-speed rotation and low-speed rotation is large. It is an object of the present invention to provide a three-phase armature winding with pole number change that can be constructed of wires, improve the winding utilization rate, and reduce the size and weight of an AC rotating electric machine.

The converter's three-phase armature winding is configured as follows. In other words, a plurality of coil groups in which multiple coils are wound concentrically for each phase are arranged consecutively without opening any slots, and from the outermost coil of the reference coil group to the innermost coil, Continuous numbers are assigned sequentially from this innermost coil to the outermost coils of the adjacent coil group in one direction.Next, among these coils, odd numbered coils are assigned the same winding within the same coil group. □, adjacent coil groups are connected in numerical order in reverse winding direction to form a first series circuit, and the even numbered coils are connected to each other in the adjacent first series circuit. A second series circuit is formed by connecting the coils in numerical order in a reverse winding direction.Furthermore, a coil at the final end of the first series circuit and a coil at the frontmost end of the second series circuit Connect with
Connect the connecting end 5- to be taken out to the outside at the connection point between the first and second series circuits and the first
and connected to each other end of the second series circuit.

[Embodiments of the invention]

FIG. 1 is a developed connection diagram of a three-phase armature winding with pole number conversion according to an embodiment of the present invention.

In this embodiment, two coil groups each consisting of three coils are successively arranged in an armature core in which 36 slots are formed. In the figure, solid lines, broken lines, and dashed-dotted lines indicate the U phase, the ■ phase, the coil UJ wound between 2 and 17, and the coil U2 wound between 2 and 17, respectively. and a coil U3 wound between 3 and 16. On the other hand, the second coil group Ua2 is wound between 19 and 36, between 20 and 35, and between 21 and 34, and coils U4, U5, . It is composed of U6.

□ Among these coils U1 to U6, odd numbered coils UJ, U, ? , U5 are connected in numerical order, that is, in the order of coils, UJ-U3-U5, in the winding direction shown in the center part of FIG. 6 to form a first series circuit. Next, among the coils U1 to U6, even numbered coil U2. A second series circuit is formed by connecting U4 and U6 in numerical order, that is, in the order of coils, U2-UJ-U6, so that the winding direction is opposite to each coil of the adjacent first series circuit. Form. The coil U5 at the final end of the first series circuit and the coil U2 at the forefront end of the second series circuit are connected.

Furthermore, there are three connection terminals U that can be taken out to the outside.

U8. X are respectively connected to the coil U1 at the forefront of the first series circuit, the connection point between the first and second series circuits, and the coil U6 at the last end of the second series circuit.

Other V-phase and W-phase coils ■1 to V6. Wl to W6 are also connected in the same way as the U phase above, and the connection terminals v, v,
y, wo, w, , z are also 0 as in the above U phase.
8 is connected to each coil. However, the coils of each phase are equally arranged in the 36 slots of the armature core.

When forming a pole number corresponding to high speed rotation in the pole number conversion three-phase armature winding having such a power configuration, a Δ connection having two parallel circuits is used as shown in FIG. 2(a). That is, connect the connection terminals Ull and V8eW to the power supply respectively, and connect between U-X, v - y8
0
0 and W-Z are short-circuited.

In the case of the delta connection circuit shown in FIG.
A current flows in the direction opposite to the winding direction, that is, in the direction opposite to the arrow in FIG. - ten thousand, coil U of the second series circuit, ? , U4, and U6, a current flows in the same direction as the winding direction. Therefore, since all currents flow in the same direction within the same coil group, slot number 16
Magnetomotive force in the same direction is excited in each coil side in each slot between slot numbers 34 and 21 and in each coil side in each slot between slot numbers 34 and 3.

Therefore, if the connection terminal U of the U phase is 1.0,
When a voltage corresponding to -0,5II is applied to the phase connection terminals V and W, respectively, the waveform of the magnetomotive force excited in the coil side of each phase of each slot 1 to 36 becomes as shown in FIG. From FIG. 3, it can be understood that when the connecting terminals are connected as shown in FIG. 2 (,), two actual poles are formed.

Next, when forming the number of poles corresponding to low-speed rotation, see Figure 2 (
As shown in b), one circuit is Δ-connected.

That is, the connection terminals U01 Vol Wo are connected to the power supply, and the connection terminals U, V, lWS are opened.

In the case of the Δ connection circuit shown in FIG. 2(b) connected in this way, for example, the connection terminal U of the U phase.

(g) When a voltage is applied to the coil U of the first series circuit
J #U3, U5 and coil U2 of the second series circuit
．． U4. A current flows through U6 in the same direction as the winding direction indicated by the arrow in FIG. 1, respectively.

Therefore, in the homologous case, magnetomotive forces in opposite directions are excited in the coil sides in the slots that are adjacent to each other.

Therefore, similarly to the Δ connection circuit shown in FIG.
When a voltage of 0 0 corresponding to -0 and 5 is applied to W, the waveform of the magnetomotive force excited on the coil side of each phase of each slot 1 to 36 becomes as shown in FIG. However, the four boundaries between the U phase and other V phases and W phases, specifically between slot numbers 3 and 4, between 15 and 16, between 21 and 22,
Currents flowing in the same direction flow through the coils between 33 and 34. Therefore, it can be understood that 32 actual poles are formed as shown in the figure.

In addition, Fig. 5 (a) and Fig. 5 (b) are respectively shown in Fig. 2 (
&) is a voltage vector diagram at the coil side in each slot when the voltage described above is applied to each connection terminal of each phase of the Δ connection circuit shown in FIG. 2(b).

Each number in the diagram indicates a slot number.

As explained above, in the pole number conversion three-phase armature winding of this embodiment, the pole number ratio between the number of poles corresponding to high speed rotation and the number of poles corresponding to low speed rotation is very high at 2:32. Although it is large, the number of connection terminals taken out to the outside is nine in total for three phases. Therefore, the wiring is not particularly complicated.

In addition, since the pole number conversion three-phase armature winding of the embodiment is composed of a single winding, it is different from the conventional armature winding composed of two windings when the pole number ratio is large. There is no need to use insulation between the windings. Therefore, the space factor of the windings inside and outside the slot can be increased, and as a result, the rotational performance of the AC rotating electric machine can be improved.

Furthermore, since a single winding is used for high-speed rotation and low-speed rotation, the winding utilization rate can be increased. Therefore, compared to the conventional three-phase armature winding using two windings, it is possible to make the AC rotating electric machine smaller and lighter.

Note that the present invention is not limited to the embodiments described above. That is, if the pole number conversion three-phase armature winding is configured as in the present invention and is composed of N coil groups each consisting of N coils, the number of poles P corresponding to high-speed rotation is N, the total number of slots 2 in the armature core is 3 nN. In addition, when connected as shown in Figure 2(b), there are two pairs of slots in which the currents of adjacent coils flow in the same direction.
Since the number of poles is N, the number of poles Pb corresponding to low speed rotation is expressed by the following equation.

Pb ” 3 nN −2N =Z −2P & By transforming the above equation, the following equation is obtained.

Z = 2 P, 10 Pb Therefore, the present invention can be applied to combinations of pole numbers that satisfy the above formula. In other words, if the number of slots is 36 and 4 poles and 28 poles are formed, the number of slots is 72 and 4 poles and 64 poles are formed.
It can be applied to cases such as forming poles.

〔Effect of the invention〕

As explained above, according to the present invention, one-phase vortex J) N coil groups each formed by concentrically winding n coils are arranged consecutively without opening a slot, and the winding direction of adjacent coils is By forming the first and second series circuits so that they are in opposite directions, and connecting these two series circuits in parallel or in series, the number of poles P, which corresponds to high-speed rotation, can be increased.
Number of poles Pb corresponding to N and low speed rotation 3 nN
2 N f can be formed. Therefore, even if the pole number ratio pa: p between the number of poles P and the number of poles Pb is large, pole number conversion is possible with a single winding and fewer connecting terminals that can be taken out to the outside. A three-phase electric machine pre-winding # can be configured.

As a result, the space factor of the windings inside and outside the slot can be increased, and the rotational performance of the current-changing rotating electric machine can be improved. Furthermore, since it is configured with a single winding, the winding utilization rate can be increased, and as a result, it is possible to reduce the size and weight of the AC rotating electric machine.

[Brief explanation of the drawing]

FIG. 1 is an expanded connection diagram of a three-phase armature winding with pole number conversion according to an embodiment of the present invention, and FIGS. 2(a) and 2(b) are the same armature windings of FIG. The Δ connection 13- line connection diagram, Figures 3 and 4 are respectively shown in Figure 2 (,)
and the magnetomotive force waveform diagram in Fig. 2(b), Fig. 5(,
) and FIG. 5(b) are voltage vector diagrams in FIG. 2(, ) and FIG. 2(b), respectively. U 1 to U 6 , V 1 to V 6 , Wl to W
6・': Iil, Ua 1, Ua 2, vl
1, Va2, Wa1. Wa 2...-:I group, Uo, Us#X#
vOpvs #y, wo, w, , z...
Connecting terminal. Applicant's agent Patent attorney Takehiko Suzue -1°47

Claims (2)

[Claims] (1) In a pole number conversion three-phase armature winding that is constructed with a single winding and obtains two types of pole numbers by switching the connecting terminals taken out to the outside, multiple coils are connected concentrically for each phase. A plurality of coil groups formed by winding are arranged in succession without opening slots, and from the outermost coil of the reference coil group to the innermost coil, and from this innermost coil to the adjacent coil group in one direction. Assign connection numbers to the coils in order, starting from the outermost coil, and among these coils, odd numbered coils are wound in the same direction within the same coil group, and reversely wound in the same direction between adjacent coil groups. a first series circuit is formed by connecting the coils in numerical order such that connection to form a second series circuit, connect the final end coil of the first 1-9Q0 series circuit and the foremost end coil of the second series circuit, and take out the connection to the outside. A pole-change three-phase armature winding, characterized in that a terminal is connected to a connection point between the first and second series circuits and to each other end of the first and second series circuits. (2) The coil group consists of three coils wound concentrically, and the coil group is arranged in two armature cores each having 36 slots. ) Three-phase armature winding with pole number conversion as described in section 2.