DE102019112458A1 - ROTATING ELECTRIC MACHINE - Google Patents

Abstract

The invention relates to a rotary electric machine (M) comprising an annular stator core (31) having a plurality of teeth (31b) and a plurality of slots (32) respectively formed between the adjacent teeth, a coil (1 ) having a plurality of unit coils (11) configured by winding in a wave winding over the plurality of slots, and a rotor (2) provided so as to face the stator core and receiving magnetic flux, which is generated by supplying the coil with power, is rotatable in which, from the two ends of all unit coils, which are arranged one ends on an outermost peripheral side of the stator core in the slots and the other ends on an innermost peripheral side of the stator core in the slots are arranged.

Description

The present invention relates to a rotary electric machine provided with a coil formed by wave winding.

In the related art, a rotary electric machine for three-phase alternating current is known which comprises an annular stator core having a plurality of teeth and a plurality of slots formed between adjacent teeth, respectively, a coil wound around the stator core , and a rotor provided to oppose the stator core in the radial direction and to rotate in response to the magnetic flux generated by the energization of the coil. The rotary electric machine for 3-phase AC provided with the coil formed by wave winding has a unit coil in which a plurality of bundles of conductive wires are wound in a wave winding at a predetermined coil pitch. for each phase, and sets the unit coils of each phase (U-phase, V-phase, W-phase) in order along a circumferential direction of the same diameter into a plurality of slots (eg JP 7-163074 A (Reference 1), JP 2011-182522 A (Reference 2), JP 2013-183492 A (Reference 3)).

In the rotating electric machine, in reference 1 is disclosed, a divided flux coil is formed by dividing each unit coil (conductor in the reference) of each phase into a plurality of parts, and a winding shape of the wave coil of a split coil of the second layer of each phase in order along the circumferential direction of the same diameter after Wave winding a split coil of a first layer of each phase in order along the circumferential direction of the same diameter is repeated in a plurality of layers. Thereby, a width of a coil end in a divided flux coil of a layer is reduced, and the expansion in the radial direction due to the interference between coil ends of each phase is minimized.

reference 2 and reference 3 discloses a rotary electric machine having 3 phases, 8 poles and 48 slots, in the long pitch winding, in which a coil pitch is larger than the number of slots per pole (number of slots of the stator core divided by the number of poles of the rotor) and short pitch winding in which a coil pitch is smaller than the number of slots per pole are alternately and repeatedly wound in wave winding along the circumferential direction of the same diameter. In the rotating electric machine, in reference 2 and reference 3 is disclosed, two in-phase unit coils, respectively inserted in two adjacent slots, are formed by seamless continuous wires.

In the rotary electric machines, in reference 1 to reference 3 are disclosed, all the unit coils of each phase are inserted into a plurality of slots in order along the circumferential direction of the same diameter. Therefore, the coil ends of the respective phases are stacked from the outer peripheral side to the inner peripheral side of the stator core, and the ends of the unit coils of each phase extend from the outer peripheral side to the inner peripheral side of the stator core. As a result, the connection work of the phase terminals of each unit coil and the neutral points of each phase in the Y connection becomes complicated.

Therefore, there is a need for a rotary electric machine that allows easy connection work on the coil end formed by wave winding.

This object is achieved by a rotary electric machine according to claim 1. Further developments are specified in the dependent claims.

A feature of a rotary electric machine according to an aspect of this disclosure is that the rotary electric machine has an annular stator core having a plurality of teeth and a plurality of slots formed between the adjacent teeth, a coil having a plurality of unit coils, which are configured by being wound by wave winding over the plurality of slots, and a rotor, which is provided looking the stator core and by receiving magnetic flux, which is generated by supplying the coil with energy is rotated, at the, of the two ends of all the unit coils, which are arranged one ends on the outermost peripheral side of the stator core in the slots and the other ends on the innermost peripheral side of the stator core are arranged in the slots.

With this configuration, of the two ends of all unit coils, one ends are disposed on the outermost peripheral side of the stator core, and the other ends are arranged on the innermost peripheral side of the stator core. Therefore, for example, in the case of a Y-connection in a rotary electric machine for 3-phase AC, the connection work of the phase terminals of the unit coils of each phase (U-phase, V-phase, W-phase) and the connection work of neutral points of the unit coils between each phase easily.

Moreover, if one end (such as the phase terminal) of the unit coil is disposed on the outermost peripheral side and the other end (such as the neutral point) of the unit coil is located on the innermost peripheral side, the division between the phase terminal and the neutral point is clear. In this way, it has been possible to provide a rotary electric machine in which the connection work of the coil end formed by wave winding is easy.

Another feature is that, in the unit coil, a coil end is formed on an end surface side of the teeth by alternately repeating a long-pitch winding in which a coil pitch is larger than the number of times Slots per pole, which is obtained by dividing the number of slots of the stator core by the number of poles of the rotor, and a short-pitch winding in which a coil pitch is smaller than that Number of slots per pole, and a coil end on the other end face side of the teeth is formed by full-pitch winding in which the coil pitch is equal to the number of slots per pole.

In this configuration, if the coil end is formed on the one end face side of the teeth by the long-pitch winding and the short-pitch winding, and the coil end is formed on the other end face side of the teeth by the full-pitch winding , it is possible to arrange both ends of the unit coil on the outermost peripheral side or the innermost peripheral side while unifying the shape of the unit coil.

Another feature is that both ends of the unit coil extend to an end surface side of the teeth.

With this configuration, since the one end face side of the teeth is formed by the long-pitch winding and the short-pitch winding, in a case where two in-phase unit coils are inserted into adjacent slots, the coil end is the one A unit coil, which is formed by the long-pitch winding, and the coil end of the other unit coil, which is formed by the short-pitch winding arranged. Thereby, a space of the coil end in the radial direction is generated without corresponding coil ends of two in-phase unit coils in the radial direction interfering. Therefore, in this configuration, if both ends of the unit coil are pulled out to this one end surface side, it becomes possible to form a wire connection portion by effectively utilizing the space in the radial direction.

Another feature is that both ends of the unit coil extend to the other end surface side of the teeth.

In this configuration, since the other end face side of the teeth is formed by the full-pitch winding, the width in the radial direction becomes large in a case where two in-phase unit coils are inserted in the adjacent slots, but one space in an axial direction is generated. Therefore, in this configuration, if both ends of the unit coil are pulled out to the other end surface side, it becomes possible to form a wire connection portion by effectively utilizing the space in the axial direction.

Another feature is that, between two in-phase unit coils inserted in adjacent slots, in a unit coil, a coil end on one end face side of the teeth is formed by a long pitch coil having a coil pitch larger is the number of slots per pole obtained by dividing the number of slots of the stator core by the number of poles of the rotor, and a coil end on the other end surface side of the teeth is formed by a short-pitch winding, which has a coil pitch smaller than the number of slots per pole, and, in the other unit coil, the other end surface side of the teeth is formed by the long pitch coil.

In this configuration, the long-pitch coil and the short-pitch coil are repeatedly arranged in the two unit coils arranged on one or the other end surface side of the teeth. Accordingly, the width of the coil ends in the radial direction on both end surfaces of the teeth can be reduced without interference of the respective coil ends in two in-phase unit coils.

Another feature is that the unit coil is formed in a spiral shape shifted by a layer in the radial direction for each angle obtained by multiplying a value obtained by dividing 360 degrees by a parallel number. in which a plurality of in-phase unit coils are electrically connected in parallel with the number of slots per pole and per phase obtained by dividing the number of slots of the stator core by the number of phases and the number of poles of the rotor.

In this configuration, for example, in a case where the parallel number of rotating ones 3 machine, 8 poles and 48 slots is equal to 4, the unit coil is formed in a spiral shape which is shifted every 180 degrees by one layer in the radial direction. That is, in the rotary electric machine in which the number of slots per pole and per phase is 2, it is possible to increase the parallel number up to 45 degrees (360 degrees / 8 poles), which is one coil pitch angle full Pitch-winding is, and the number of parallel connections can be up to 16. Accordingly, both ends of the unit coil can be arranged in the outermost peripheral side or the innermost peripheral side, while the parallel number is increased and a large current can be applied to the rotary electric machine.

Another feature is that one end of the unit coil is configured by a neutral point of a Y-connection.

The neutral point of the Y connection has a neutral point connection wire for connection of all phases, which is less than the phase connection connection wire provided in each phase. With this configuration, if one end of the unit coil disposed on the outermost peripheral side of the stator core is a neutral point, since it is possible to arrange the neutral point connection wire along the coil end on the outermost peripheral side of the coil end, The size of the shaft of the rotating electric machine can be made compact.

• 1 eine vergrößerte Teil-Querschnittsansicht einer rotierenden elektrischen Maschine;
• 2 eine schematische Ansicht, die ein Konfigurationsbeispiel einer Einheitsspule zeigt;
• 3 eine schematische Draufsicht, die ein Anordnungsbeispiel in einem Schlitz der Einheitsspule zeigt;
• 4 eine schematische Draufsicht, die ein Verdrahtungsbeispiel einer Y-Verbindung zeigt;
• 5 eine schematische Draufsicht, die eine Wicklungskonfiguration einer U1-Phase zeigt;
• 6 eine schematische Draufsicht, die eine Wicklungskonfiguration einer U2-Phase zeigt;
• 7 eine schematische Draufsicht, die eine Wicklungskonfiguration einer U3-Phase zeigt;
• 8 eine schematische Draufsicht, die eine Wicklungskonfiguration einer U4-Phase zeigt;
• 9 eine Abwicklungsansicht, die Einheitsspulen jeder Einheitsphase zeigt;
• 10 eine schematische Seitenansicht, die eine Wicklungskonfiguration jeder Phase zeigt;
• 11 eine schematische Draufsicht, die ein Anordnungsbeispiel einer U-Phaseneinheitsspule nach einer anderen Ausführungsform 1 zeigt;
• 12 eine schematische Draufsicht, die ein Anordnungsbeispiel einer U-Phaseneinheitsspule nach einer anderen Ausführungsform 2 zeigt;
• 13 eine schematische Draufsicht, die eine Wicklungskonfiguration einer U1-Phase entsprechend einer anderen Ausführungsform 2 zeigt; und
• 14 eine schematische Draufsicht, die eine Wicklungskonfiguration einer U2-Phase entsprechend der anderen Ausführungsform 2 zeigt.

Further features and expediencies will become apparent from the description of embodiments with reference to FIGS. From the figures show:

• 1 an enlarged partial cross-sectional view of a rotating electrical machine;
• 2 a schematic view showing a configuration example of a unit coil;
• 3 a schematic plan view showing an arrangement example in a slot of the unit coil;
• 4 a schematic plan view showing a wiring example of a Y-connection;
• 5 a schematic plan view showing a winding configuration of a U1 phase;
• 6 a schematic plan view showing a winding configuration of a U2 phase;
• 7 a schematic plan view showing a winding configuration of a U3 phase;
• 8th a schematic plan view showing a winding configuration of a U4 phase;
• 9 a development view showing unit coils of each unit phase;
• 10 a schematic side view showing a winding configuration of each phase;
• 11 a schematic plan view showing an arrangement example of a U-phase unit coil according to another embodiment 1;
• 12 a schematic plan view showing an arrangement example of a U-phase unit coil according to another embodiment 2;
• 13 a schematic plan view showing a winding configuration of a U1 phase according to another embodiment 2; and
• 14 is a schematic plan view showing a winding configuration of a U2 phase according to the other embodiment 2.

Hereinafter, an embodiment of a rotary electric machine according to this disclosure will be described based on the drawings. In this embodiment, a three-phase AC synchronous motor (hereinafter referred to as motor M) will be described as an example of a rotary electric machine. However, without being limited to the following embodiments, various modifications can be made without departing from the scope of this disclosure.

As in 1 shown is the engine M has a stator 3 with a plurality of slots 32 to the one coil 1 is wound, and a rotor 2 , which is opposite to the stator 3 is provided and a plurality of permanent magnets 22 has, on. In the following description, the direction of rotation (direction of rotation) and the reverse direction of rotation of the rotor 2 as a circumferential direction X denotes the radial direction of the rotor 2 is called a radial direction Y and a direction parallel to the axis of the stator core 31 (Coaxial with the axis of rotation of the rotor 2 ) is considered an axial direction Z designated. Furthermore, in the radial direction Y a direction from the stator 3 to the rotor 2 (Opening side of the slot 32 ) as an inner (inward) radial direction Y1 and a direction from the rotor 2 to the stator 3 (Bottom side of the slot 32 ) as an outer (external) radial direction Y2 designated. Further, in the axial direction Z, a direction from the front side to the back side of the drawing becomes 1 as an axis-backward direction Z1 and a direction from the back to the front of the drawing 1 as an axis forward direction Z2 designated.

The stator has the cylindrical stator core 31 on, and the stator core 31 is formed by laminating a plurality of magnetic steel plates. The stator core 31 is from a yoke section 31a which is annular on the side of the outer radial direction Y2 is formed, a plurality of teeth 31b coming from the yoke section 31a in the inner radial direction Y1 projecting, and a flange portion 31c along the circumferential direction X at the protruding end of the plurality of teeth 31b is configured. Between adjacent teeth 31b are the slots 32 around which the coil 1 is wound, formed accordingly, and the majority of the slots 32 is in the same number as the majority of teeth 31b intended.

The rotor 2 is provided to oppose the flange portion 31c of the stator core 31 and turns in response to the magnetic flux generated by supplying the coil 1 is generated with energy. The rotor 2 has a cylindrical rotor core 21 by laminating the plurality of magnetic steel plates and the plurality of permanent magnets 22 in the rotor core 21 are embedded, is formed. The rotor core 21 is held (carried) by a shaft part (not shown), and the rotor 2 is configured relative to the stator in the circumferential direction X to be rotatable (rotatable). The permanent magnet 22 is configured of a rare earth magnet or the like, and the N poles and the S poles are alternately in the circumferential direction X arranged. The outer peripheral surfaces of the plurality of permanent magnets 22 can get out of the rotor core 21 be exposed.

The sink 1 that are around the majority of slots 32 is formed, for example, formed of a conductive wire in which a copper wire is covered with an insulating layer. As this conductive wire, various conductive wires such as a round wire having a round cross section, a square wire having a polygonal cross section, and a rectangular wire having a rectangular cross section may be used. In this embodiment, the winding method of the coil 1 concerning the slot 32 a wave winding.

2 shows a wave wound unit coil 11 as a winding method of the coil 1 concerning the slot 32 , Although details are described later, the coil 1 is by electrically connecting a plurality of in-phase unit coils in parallel 11 trained (see 4 ).

Although this unit coil 11 is usually configured by bundling a plurality of conductive wires, it is represented by a line segment for simplicity. The unit coil 11 has a plurality of coil sides 11a along the axial direction Z and a plurality of coil ends 11b along the circumferential direction X on. One end of the coil side 11a along the axial direction Z is with the coil end 11b in a first direction (right direction in the drawing) along the circumferential direction X connected, and the other end of the coil side 11a along the axial direction Z is connected to the coil end 11b in a second direction (left direction in the drawing) opposite to the first direction along the circumferential direction X , That is, the coil end 11b alternately connects one end or the other end of the pair of coil sides 11a facing each other in the circumferential direction X with a predetermined coil pitch in the axial direction Z are adjacent. As described above, in the wave wound coil 1 the coil end repeats itself 11b alternately on the one end surface side of the teeth 31b and the other end surface side of the teeth 31b (please refer 10 ).

The coil pitch is an integer close to the number of slots per pole or the number of slots per pole obtained by dividing the number of slots of the stator by the number of poles of the rotor. For example, in the case of the motor M with 8 poles and 48 slots (the number of slots per pole is 6), 6 slots (full-pitch winding), 5 slots (short-pitch winding) or 7 slots (long pitch) are used. Pitch-winding) selected for this coil division.

Returning to 1 , each of the coils 1 Each phase (U-phase, V-phase, W-phase) has a plurality of layers ( 5 Layers in this embodiment) of the coil side 11a the plurality of unit coils 11 (in this embodiment, two combinations of 5 and 7 ) in the slot 32 along the radial direction Y are laminated on. The number of laminated layers on the coil side 11a in the slots 32 is not particularly limited as long as it is two or more.

3 shows an arrangement example in which the plurality of coil sides 11a the unit coil in each phase in the slot 32 laminated. The U-phase coil 1 , the V-phase coil 1 and the W-phase coil 1 are at 120 ° out of phase from each other at the electrical angle in that order. Hereinafter, since the arrangement configuration of the unit coil 11 it is the U-phase coil, except for the phase shift of each phase (U-phase, V-phase, W-phase) 1 described as a representative. In addition, the numbers increasing in the counterclockwise direction along the outer circumference indicate the virtual slot numbers set. Hereinafter, if the slot number of each slot 32 is to be expressed, eg as "No. 1 slot "described.

In this embodiment, the engine M with 3 phases, 8 poles and 48 slots as an example. The motor M according to this embodiment, an integer number of slots in which the irreducible fraction obtained by dividing the number has ( 48 Slots) of the slots 32 of the stator 3 by the number of phases ( 3 Phases) and the number of magnetic poles ( 8th Pole) of the rotor 2 (hereinafter also referred to as the number of slots per pole and per phase) is equal to 2. That is, in a case where the number of slots having the same phase and the same current direction in each pole (N-pole or S-pole) is 2, for example, in the case of U-phase, the adjacent No. 1 slot is located and No. 48 slot facing the same magnetic pole.

As in 4 shown is the U-phase coil 1 has four unit coils 11 on, and these unit coils 11 are electrically connected in parallel (connected in parallel). In the same way are four unit coils 11 in the V-phase coil 1 connected in parallel and in the W-phase coil 1 Likewise. The 3-phase coil 1 is electrically connected to the neutral point of the Y connection. The 3-phase coil 1 may be electrically connected by a Δ connection, and is not particularly limited thereto. The following are the four U-phase unit coils 11 accordingly as "U1-phase unit coil 11 "," U2-phase unit coil 11 "," U3-phase unit coil 11 "And" U4-phase unit coil 11 " designated.

Returning to 3 , the U1-phase unit coil 11 is connected to the one end (neutral point U1n in this embodiment) in the outermost layer, in the outer radial direction Y2 of the No. 1 slot, and the other end (phase connection u1s in this embodiment) on the innermost layer, in the inner radial direction Y1 No. 18 slot is provided. The U2 -Phase coil unit 11 is with the one end (neutral point U2n in this embodiment) in the outermost layer, in the outer radial direction Y2 No. 13 slot, and the other end (phase terminal U2's in this embodiment) in the innermost layer, in the inner radial direction Y1 No. 30 slot is provided.

The U3 -Phase coil unit 11 is with the one end (neutral point U3N in this embodiment) in the outermost layer, in the outer radial direction Y2 No. 25 slot, and the other end (phase connection U3s in this embodiment) in the innermost layer, in the inner radial direction Y1 No. 42 slot is provided. The U4 -Phase coil unit 11 is with the one end (neutral point U4n in this embodiment) in the outermost layer, in the outer radial direction Y2 No. 37 slot, and the other end (phase connection U4S in this embodiment) in the innermost layer, in the inner radial direction Y1 No. 6 slot is provided. As described above, the V-phase terminals V 1s to v4s , the V-phase neutral points V1n to v4n , the W-phase connections W1s to W4S and the W-phase neutral points w1n to W4n have the same configuration, and therefore the description thereof will be omitted.

That is, in this embodiment, from both ends of all unit coils 11 , the one ends of the two ends are on the outermost peripheral side of the stator core 31 arranged, and the other ends of the two ends are on the innermost peripheral side of the stator core 31 arranged. In addition, this becomes one end of the unit coil 11 configured from a neutral point of the Y-connection, and the other end of the unit coil 11 is configured by a phase connection of the Y connection.

Hereinafter, a winding configuration (arrangement configuration of the unit coil 11 ) for arranging both ends of all unit coils 11 on the outermost peripheral side or the innermost peripheral side of the stator core 31 with reference to the 3 and 5 to 10 described. In the following description will be in the slots 32 in which five layers of the coil side 11a are described, the first to fifth layers from the outermost layer on the outermost peripheral side to the innermost layer on the innermost peripheral side described. That is, the outermost layer of the slot 32 is the first layer, and the second layer, the third layer, the fourth layer and the fifth layer are in the inner radial direction Y1 arranged.

In the 3 and 5 to 8th becomes the coil side 11a the unit coil 11 the U1 phase (the same applies to the V1 phase and the W1 phase in 3 ) indicated by a solid circle, the coil side 11a the unit coil of the U2 phase (the same applies to the V2 phase and the W2 phase in 3 ) is indicated by a solid square, the coil side 11a the unit coil 11 the U3 phase (the same applies to the V3 phase and the W3 phase in 3 ) is indicated by a dashed circle, and the coil side 11a the unit coil 11 the U4 phase (the same applies to the V4 phase and the W4 phase in 3 ) is indicated by a dashed square. In the 5 to 8th becomes the coil end 11b that the coil sides 11a which are adjacent in the circumferential direction X connects, on an end surface side (front side of the drawing) of the teeth 31b indicated by a solid line, and on the other end surface side (back side of the drawing) of the teeth 31b it is indicated by a dashed line. In the 9 and 10 becomes the U-phase unit coil 11 indicated by a solid line, the V-phase unit coil 11 is indicated by a broken line and the W-phase unit coil 11 is indicated by a broken line with two dots. The numbers, the unwinding view of the unit coil 11 , in the 9 are shown attached indicate the coil pitch. 3 and 5 to 8th are schematic views in which the flange portion 31c of the stator core 31 is omitted.

5 shows the winding configuration of the U1-phase unit coil 11 , One end (neutral point U1n ) of the two ends of the U1-phase unit coil 11 is the first layer of the # 1 slot, the coil side 11a is in the axial reverse direction Z1 No. 1 slot, and the coil end 11b is on the other end face side (back of the drawing) of the teeth 31b from the first layer of the No. 1 slot to the first layer of the No. 7 slot, the coil pitch being a full-pitch winding (6 slots). Next is the coil side 11a in the axial forward direction Z2 No. 7 slot, and the coil end 11b is on the one end face side (front of the drawing) of the teeth 31b from the first layer of the # 7 slot to the first layer of the No. 12 slot, the coil pitch being a short pitch winding (5 slots).

Next is the coil side 11a in the axial reverse direction Z1 of the No. 12 slot, and the coil end 1 1b is on the other end face side (back of the drawing) of the teeth 31b from the first layer of the # 12 slot to the first layer of the # 18 slot, the coil pitch being a full pitch coil (6 slots). Next is the coil side 11a in the axial forward direction Z2 of the No. 18 slot, and the coil end 11b is on the one end face side (front of the drawing) of the teeth 31b from the first layer of the No. 18 slot to the second layer of the No. 25 slot, the coil pitch being a long pitch winding (7 slots). For the U1-phase unit coil 11 this half cycle (0.5 revolution), the coil pitch repeats a full-pitch, short-pitch, full-pitch, and long-pitch, in this order. The U1 -Phase unit coil is arranged so that it is one layer in the inner radial direction Y1 in the No. 25 slot shifted 180 degrees from the No. 1 slot.

That is, the first 0.5 revolution of the U1-phase unit coil 11 repeats full-pitch-winding, short-pitch-winding, full-pitch-winding and long-pitch-winding in this order in the order of No. 1 slot, the No. 7 slot, the No. 12 slot, the No. 18 slot and the No. 25 slot. In the No. 25 slot, which is shifted 180 degrees from the No. 1 slot, becomes the coil side 11a in the second layer of the slot 32 arranged around a layer in the inner radial direction Y1 is moved.

Similarly, the second 0.5 revolution of the U1-phase unit coil 11 repeats a full-pitch, short-pitch, full-pitch, and long-pitch-windings in this order in the order of No. 25 slots, the No. 31 slot, the No. 36 slot, the No. 42 slot and the No. 1 slot. In the No. 1 slot, which is shifted 180 degrees from the No. 25 slot, the coil side becomes 11a in the third layer of the slot 32 arranged around a layer in the inner radial direction Y1 is moved. Furthermore, the same winding configuration for one pass ( 1 Rotation), and the coil side 11a the U1-phase unit coil 11 is placed in the third layer and in the fifth layer of the # 1 slot.

Next is the coil end 1 1b on the other end face side (back of the drawing) of the teeth 31b from the fifth layer of the No. 1 slot to the fifth layer of the No. 7 slot, the coil pitch being a full-pitch winding (6 slots). Next is the coil side 11a in the axial forward direction Z2 No. 7 slot, and the coil end 11b becomes on the one end face side (front of the drawing) of the teeth 31b from the fifth layer of the # 7 slot to the fifth layer of the # 12 slot, the coil pitch being a short pitch coil (5 slots). Next is the coil side 11a in the axial reverse direction Z1 of the No. 12 slot, and the coil end 11b will be on the other end face side (back of the drawing) of the teeth 31b from the fifth layer of the # 12 slot to the fifth layer of the # 18 slot, the coil pitch being a full pitch coil (6 slots). Then the coil side 11a in the axial forward direction Z2 of the No. 18 slot, and the other End (phase connection u1s ) of the U1-phase unit coil 11 is pulled out. In other words, the fifth layer of the No. 18 slot is the other end (live connection u1s ) of the U1-phase unit coil 11 , That is, the fifth, substantially 0.5 revolution of the U1-phase unit coil 11 , is arranged in the sequence of the full-pitch winding, the short-pitch winding and the full-pitch winding from the fifth layer of the No. 1 slot to the fifth layer of the No. 18 slot, and the other end (FIG. phase connection u1s ) of the U1-phase unit coil 11 is pulled out of the end of the full-pitch winding.

As a result, there is the U1-phase unit coil 11 from a total of substantially 2.5 revolutions, and on the one end face side (front side of the drawing) of the teeth 31b For example, a short-pitch winding and a long-pitch winding are alternately repeated. On the other end face side (back of the drawing) of the teeth 31b All windings are full-pitch windings.

6 shows the winding configuration of the U2-phase unit coil 11 , The one end (neutral point U2n ) of the two ends of the U2-phase unit coil is the first layer of the no. 13 Slot, and the other end (phase connection U2's ) of the U2-phase unit coil is the fifth layer of the no. 30 Slot. That is, the positions of the two ends of the U2-phase unit coil 11 are counterclockwise by an angle (90 degrees) by dividing 360 degrees by the number of U-phase unit coils 11 (four, the same as the parallel number in 4 ) is compared with the positions of both ends of the U1-phase unit coil 11 postponed.

In the winding configuration of the U2-phase unit coil 11 in the same way as in the U1-phase unit coil 11 , a full-pitch winding, short-pitch winding, full-pitch winding, and long-pitch winding in that order in the first 0.5 turn in the order of no. 13 Slot, of the no. 19 Slot, of the no. 24 Slot, of the no. 30 Slot and no. 37 Slot repeated, and the coil side 11a is on the second layer of the slot 32 around a layer in the inner radial direction Y1 in the no. 37 Slit 180 degrees opposite the no. 13 Slit is moved, moved. In the same way, the second 0.5 revolution of the U2-phase unit coil repeats 11 a full-pitch-winding, short-pitch-winding, full-pitch-winding, and long-pitch-winding in this order in the order of no. 37 Slot, of the no. 43 Slot, of the no. 48 Slot, number 6 and no. 13 Slot, and the coil side 11a is on the third layer of the slot 32 around a layer in the inner radial direction Y1 in the no. 13 Slit 180 degrees opposite the no. 37 Slit is moved, moved. Furthermore, the same winding configuration for one round ( 1 Rotation), and the coil side 11a the U2-phase unit coil 11 is in the third layer and in the fifth layer of No. 13 Slot arranged. The fifth essentially 0.5 turn of the U2-phase unit coil 11 is in the order of the full-pitch winding, the short-pitch winding, and the full-pitch winding of the fifth layer of the no. 13 Slit to the fifth layer of the no. 30 Slot arranged, and the other end (phase connection U2's ) of the U2-phase unit coil 11 is pulled out of the end of the full-pitch winding.

7 shows the winding configuration of the U3-phase unit coil 11 , The one end (neutral point U3N ) of the two ends of the U3-phase unit coil 11 is the first layer of the no. 25 Slot, and the other end (phase connection U3s ) of the U3-phase unit coil 11 is the fifth layer of the no. 42 Slot. That is, the positions of the two ends of the U3-phase unit coil 11 are counterclockwise by an angle (90 degrees), divided by 360 degrees by the number of U-phase unit coils 11 (four, the same as the parallel number in 4 ) is compared with the positions of both ends of the U2-phase unit coil 11 , postponed.

In the winding configuration of the U3-phase unit coil 11 in the same way as in the U2-phase unit coil 11 , the full-pitch winding, short-pitch winding, full-pitch winding, and long-pitch winding in this order in the first 0.5 turn in the order of no. 25 Slot, of the no. 31 Slot, of the no. 36 Slot, of the no. 42 Slot and number 1 slot, and the coil side 11a is in the second layer of the slot 32 around a layer in the inner radial direction Y1 in the No. 1 slot, which is 180 degrees from the no. 25 Slit is moved, moved. In the same way, the second 0.5 revolution of the U3-phase unit coil repeats 11 the full-pitch winding, short-pitch winding, full-pitch winding and long-pitch winding in this order in the sequence of No. 1 slot, No. 7 slot, No. 12 Slot, of the no. 18 Slot and no. 25 Slot, and the coil side 11a is in the third layer of the slot 32 around a layer in the inner radial direction Y1 in the no. 25 Slit shifted 180 degrees from the # 1 slot moved. Furthermore, the same winding configuration for one round ( 1 Rotation), and the coil side 11a the U3-phase unit coil 11 is in the third layer and the fifth layer of the no. 25 Slot arranged. The fifth, essentially 0.5 turn of the U3-phase unit coil 11 is in the order of full-pitch winding, short-pitch winding and full Division winding from the fifth layer of No. 25 Slit to the fifth layer of the no. 42 Slot arranged, and the other end (phase connection U3s ) of the U3-phase unit coil 11 pulled out from the end of the full-pitch winding.

8th shows the winding configuration of the U4-phase unit coil 11 , The one end (neutral point U4n ) of the two ends of the U4-phase unit coil 11 is the first layer of the no. 37 Slot, and the other end (phase connection U4S ) of the U4-phase unit coil 11 is the fifth layer of the No. 6 slot. That is, the positions of the two ends of the U4-phase unit coil 11 are counterclockwise by an angle (90 degrees) by dividing 360 degrees by the number of U-phase unit coils 11 (4, same as the parallel number in 4 ) is compared with the positions of both ends of the U3-phase unit coil 11 postponed.

In the winding configuration of the U4-phase unit coil, the same manner as in the U1-phase unit coil 11 a full-pitch winding, short-pitch winding, full-pitch winding and long-pitch winding in this order in the first 0.5 turn in the order of No. 37 Slot, of the no. 43 Slot, of the no. 48 Slot, of the no. 6 Slot and no. 13 Slot repeated, and the coil side 11a is in the second layer of the slot 32 forming a layer in the inner radial direction Y1 in the no. 13 Slit 180 degrees opposite the no. 37 Slit is moved, moved. In the same way, the second 0.5 revolution of the U4-phase unit coil repeats a full-pitch, short-pitch, full-pitch, and long-pitch-windings in this order in the order of No. 13 Slot, of the no. 19 Slot, of the no. 24 Slot, of the no. 30 Slot and no. 37 Slot, and the coil side 11a is on or in the third layer of the slot 32 forming a layer in the inner radial direction Y1 in the no. 37 Slit 180 degrees opposite the no. 13 Slit is moved, moved. Furthermore, the same winding configuration for one cycle ( 1 Rotation), and the coil side 11a the U4-phase unit coil 11 is on or in the third layer and the fifth layer of No. 37 Slot arranged. The fifth, essentially 0.5 turn of the U4-phase unit coil 11 is in the order of the full-pitch winding, the short-pitch winding, and the full-pitch winding of the fifth layer of the no. 37 Slot arranged to the fifth layer of the No. 6 slot, and the other end (phase terminal U4S ) of the U4-phase unit coil 11 is pulled out of the end of the full-pitch winding.

As described above, the winding configuration of the U-phase unit coil 11 repeats 0.5 turns configured with the full-pitch winding, the short-pitch winding, the full-pitch winding, and the long-pitch winding for two turns, and the final shape is the same with the full-pitch winding, short-pitch winding and full-pitch winding in substantially 0.5 turns (see the development view of FIG 9 ). In addition, as in the 5 to 8th the plurality of in-phase unit coils is shown 11 the same spiral shape configured by shifting the positions of both ends by 90 degrees in the circumferential direction X. Therefore, even in a case where the U1 phases to U4-phase unit coils 11 are electrically connected in parallel, a potential difference between the corresponding unit coils 11 not, and the generation of a circulating current can be prevented.

The plurality of unit coils, which are electrically connected in parallel, are formed in a spiral shape, each around a layer in the inner radial direction Y1 all 180 degrees (0.5 turns) are shifted. The angle by which a layer is shifted is defined by an angle that can be multiplied by multiplying the number ( 2 ) of the slots per pole and per phase with the value obtained by dividing 360 degrees by the parallel number ( 4 ), in which the plurality of in-phase unit coils 11 are electrically connected in parallel, is obtained. That is, in the motor M of this embodiment in which the number of slots per pole and per phase is 2, it is possible to increase the parallel number up to 45 degrees (360 degrees by 8 poles), which is one coil pitch angle full-pitch winding is, and the number of parallel connection can be up to 16 be. As a result, it is possible to apply a large current to the motor by increasing the parallel number.

As in 9 is shown when the unit coil 11 expanded (shown unwound in one plane) have the U-phase unit coils 11 all the same shape with ten full-pitch windings and a total of nine windings, which are short-pitch windings or long-pitch windings. In the same way as the U-phase, the V-phase and the W-phase all have the same shape including ten full-pitch windings and a total of nine short-pitch windings or long-pitch windings. As described above, since the shape of all unit coils 11 is the same, it is possible the training tool for the unit coil 11 to standardize and reduce manufacturing costs.

$$\text{G}=\left(\text{D}/\text{C}\right)\text{X}\left(\text{B}/\text{2A}\right)-1$$

In this case, the total number (F) of the coil ends 11b the full-pitch windings of the unit coil 11 and the total number (G) of the coil ends of the short-pitch coils and the long-pitch coils in this embodiment are defined by the following equation (1) and equation (2). A stands for the number of phases, B stands for the number of slots, C stands for the number of in-phase unit coils 11 (same as the parallel number) and D stands for the number of laminations in a slot 32 , $$\text{F}=\left(\text{D}/\text{C}\right)\text{X}\left(\text{B}/\text{2A}\right)$$

$$\text{G}=\left(\text{D}/\text{C}\right)\text{X}\left(\text{B}/\text{2A}\right)-1$$

The motor M of this embodiment has 3 phases, 8 poles and 48 slots (A = 3, B = 48), the number of in-phase unit coils is four (C = 4), and the number of laminations in slot 32 is five (D = 5). That's why the total number of coil ends 11b the full-pitch windings F = (5/4) X (48/6) = 10 according to the equation (1) and the total number of coil ends 11b The short-pitch windings and long-pitch windings are G = (5/4) X (48/6) -1 = 9 according to the equation (2).

10 FIG. 12 is a conceptual illustration of the winding configuration of each phase when viewed in the radial direction Y. FIG. Like from the 10 is to be understood in all unit coils 11 each phase on the one end face side (upper side in the drawing) of the teeth 31b the short-pitch winding and the long-pitch winding are alternately repeated, and on the other end surface side (lower side of the drawing) of the teeth 31b Full-pitch windings are performed. Because the one end face side of the teeth 31b configured by long pitch windings and short pitch windings are when two in-phase unit coils 11 in neighboring slots 32 are used, the one coil end, in which a unit coil 11 is formed by long-pitch winding, and the other coil end formed by short-pitch winding is disposed adjacent. Accordingly, the width of the coil end 11b in the radial direction Y without interference with the coil end 11b the in-phase unit coil 11 be reduced. On the other hand, because the full-pitch winding can be on the other end face side of the teeth 31b is repeated, the width in the radial direction Y is greater than that on the one end surface side, since the coil end 11b the in-phase unit coil 11 interferes with the others. Therefore, on the one end surface side in the radial direction Y formed a space in the plan view. In this embodiment, both ends of the unit coil 11 extended in the same axial direction Z, and both ends of the unit coil 11 are pulled out (led out) on the one end face side (see the 9 and 10 ). That is, since the one end surface side on which the space in the radial direction Y is formed, the same direction side on which the two ends of the unit coil are extended, it becomes possible to form a wire connecting portion by effectively utilizing the space, and the diameter dimension of the motor can be made compact. Both ends of the unit coil 11 can move in the same direction in the axial direction Z extend, and both ends of the unit coil 11 can be pulled out on the other end face side. In this case, the width is in the radial direction Y larger on one end surface side than on the other end surface side, but the space becomes in the axial direction Z generated. Therefore, the space can be effectively utilized for forming a wire connecting portion, and the size of the shaft of the motor M can be made compact.

Other Embodiment 1

11 shows a configuration example of the U-phase unit coil 11 according to another embodiment 1 in an engine M with 3 phases, 8 poles and 48 Slots. In this embodiment, of two in-phase unit coils 11 that are in adjacent slots 32 are used, in which a unit coil 11 the two unit coils the coil end 11b on the one end face side of the teeth 31b formed by a long-pitch winding and the coil end 11b on the other end face side of the teeth 31b is through a short-pitch winding in a unit coil 11 formed, and the other unit coil 11 is the coil end 11b on the one end face side of the teeth 31b is formed by a short-pitch winding and the coil end 11b on the other end face side of the teeth 31b is formed by a long-pitch winding.

That is, in the U1-phase unit coil 11 and the U3-phase unit coil 11 which in the no. 1 Slot are inserted, the coil end 11b on the one end face side (front of the drawing) of the teeth 31b formed by long pitch winding and the coil end 11b on the other end face side (back of the drawing) of the teeth 31b is formed by short-pitch winding. On the other hand, in the U2-phase unit coil 11 and the U4-phase unit coil 11 which in the no. 48 Slit are inserted adjacent to the no. 1 Slot is the coil end 11b on the one end surface side (front of the drawing) of the teeth 31b formed by short-pitch winding and the other coil end 11b on the other end face side (back of the drawing) of the teeth 31b is formed by long pitch winding.

That is, in this embodiment, in two unit coils (eg, the U1 phase unit coil 11 and the U2-phase unit coil 11 ), on one or the other end face side of the teeth 31b are arranged, the long-pitch winding and the short-pitch winding repeatedly arranged. Such are in the embodiment in 11 , with two unit coils (eg the U1-phase unit coil 11 and the U2-phase unit coil 11 ) in adjacent slots 32 for which one of the two unit coils, the long pitch coils are repeated on the one end face side of the teeth 31b and the short-pitch coils repeat on the other end-face side of the teeth 31b and accordingly, for the other of the two unit coils, the short-pitch coils are repeatedly on the one end-face side of the teeth 31b and the long pitch coil repeats on the other end face side of the teeth 31b arranged. Accordingly, the width of the coil end 11b in the radial direction Y on both end surface sides of the teeth 31b can be reduced without interference of the coil ends 11b in the in-phase unit coils 11 ,

Other Embodiment 2

The 12 to 14 show configuration examples of a U-phase unit coil 11 another embodiment 2 in the motor M with 3 phases, 8 poles and 48 Slots.

In this embodiment, the parallel number in which a plurality of (two in this embodiment) is in-phase unit coils 11 is electrically connected in parallel, equal to 2. Also in this embodiment, as in the embodiment described above, the unit coil 11 formed in a spiral shape that extends around a layer in the radial direction at each angle ( 360 Degree in this embodiment) obtained by multiplying the number ( 2 ) of the slots per pole and per phase with the value obtained by dividing 360 degrees by the parallel number ( 2 ) (see 13 and 14 ).

In this embodiment, since the parallel number and the number of slots per pole and per phase are the same, a plurality of (five in this embodiment) coil sides 11a a unit coil 11 for a slot 32 to be ordered. Therefore, it is not necessary, the end of the U1-phase unit coil 11 and the end of the U3-phase unit coil 11 to arrange shifted by 180 degrees, as it is in the example, that in 3 is shown.

In this embodiment, as in FIG 12 is shown, the one end (neutral point U1n ) of a U1 phase coil side 11a is used as the first layer of the No. 1 slot, and the one end (neutral point U2n ) of a U2 phase coil side 11a is referred to as the first layer of No. 48 Slot that is adjacent to the # 1 slot. Next, the other end (phase connection u1s ) of U1 phase coil side 11a as the fifth layer of No. 42 Slot used, and the other end (phase connection U2's ) of the U2 phase coil side 11a is called the fifth layer of the No. 43 Slot used adjacent to the no. 42 Slot is.

As a result, the ends of the two U-phase unit coils 11 from adjacent slot 32 pulled out (led out). Thereby, the phase connection connection wire can be shortened, and erroneous wiring of the phase connection connection wire of each phase can be prevented.

In addition, all unit coils have 11 a total of substantially five turns, and on the one end face side (front of the drawing) of the teeth 31b For example, short-pitch winding and long-pitch winding are alternately repeated. On the other end face side (back of the drawing) of the teeth 31b everywhere full-pitch winding is performed (see the 13 and 14 ).

Here, the total number (F) of the coil ends 11b the full-pitch coils of the unit coil 11 and the total number (G) of the coil ends 11b the short-pitch windings and the long-pitch windings are defined as below. The motor M This embodiment has 3 phases, 8 poles and 48 Slots (A = 3, B = 48), the number of in-phase unit coils 11 is two (C = 2), and the number of laminations in the slot 32 is five (D = 5). That's why the total number of coil ends 11b the full-pitch windings equal F = (5/2) X (48/6) = 20 according to the above equation (1), and the total number of coil ends 11b The short-pitch windings and long-pitch windings are G = (5/2) X (48/6) -1 = 19 according to the equation (2).

On the other hand, the shapes of the unit coils 11 different between the U1 phase and the U2 phase. As in 13 shown is the U1-phase unit coil 11 repeats 0.5 turns configured with full-pitch winding, short-pitch winding, full-pitch winding, and long-pitch winding for 4.5 turns, and the last, essentially 0.5 revolution is configured with full-pitch winding, short-pitch winding and full-pitch winding. As in 14 shown is the U2-phase unit coil 11 repeats 0.5 turns configured with full-pitch winding, long-pitch winding, full-pitch winding and short-pitch winding for 4.5 turns, and the last substantially 0.5 turn is configured with full-pitch winding, long-pitch winding and full-pitch winding.

As described above, in this embodiment, though it is necessary, two types of the shape of the unit coil 11 provide, the phase connection connection wire can be shortened, and a faulty wiring of the phase connection connection wire can be prevented. In addition, as in the example 3 Also in this embodiment, both ends of the U3-phase unit coil 11 and both ends of the U4-phase unit coil 11 from adjacent slots 32 pulled out, while both ends of the U1-phase unit coil 11 and both ends of the U2-phase unit coil 11 from adjacent slots 32 can be pulled out.

Other embodiments

1. (1) In the embodiment described above, this is one end of the unit coil 11 on the outermost peripheral side of the stator core 31 is arranged, configured from a neutral point of the Y-connection, and the other end of the unit coil 11 on the innermost peripheral side of the stator core 31 is arranged, is configured from a phase connection of the Y-connection. Instead of this configuration, the one end of the unit coil may be on the outermost peripheral side of the stator core 31 is arranged to be configured from a phase connection of the Y-connection and the other end of the unit coil 11 on the innermost peripheral side of the stator core 31 can be configured from a neutral point of the Y-connection.
2. (2) In the above embodiment, the unit coil is 11 from the outermost peripheral side of the stator core wound so as to be a layer in the inner radial direction Y1 is shifted at every predetermined angle, but the unit coil 11 can from the innermost peripheral side of the stator core 31 be wrapped so that it is one layer in the outer radial direction Y2 is shifted at every predetermined angle.
3. (3) In the embodiment described above, the engine is M with 8 poles and 48 Slots have been described as an example, but every engine M can be used as long as the number of slots per pole and per phase is an integer. Furthermore, the engine M is not limited to the engine M in which the rotor 2 in the inner radial direction Y1 of the stator core 31 is provided, but he can be an engine M be where the rotor 2 in the outer radial direction Y of the stator core 31 is provided.
4. (4) The engine M In the embodiment described above, it is not limited to a three-phase AC synchronous motor and may be an AC motor having two or more phases, an induction motor, a synchronous motor or the like.

The disclosure is applicable to a rotary electric machine provided with a coil formed by wave winding.

The principles, preferred embodiments and operation of the present teachings have been described in the foregoing description. However, the teachings are not intended to be construed as limited to particular embodiments disclosed. Furthermore, the embodiments described herein are to be considered as illustrative and not restrictive. Deviations and changes may be made without departing from the spirit of the present teachings. Accordingly, it is expressly intended that all such variations and changes fall within the scope of the claims.

It is explicitly pointed out that all features disclosed in the description and / or the claims are considered separate and independent of each other for the purpose of original disclosure as well as for the purpose of limiting the claimed invention independently of the feature combinations in the embodiments and / or the claims should. It is explicitly stated that all range indications or indications of groups of units disclose every possible intermediate value or subgroup of units for the purpose of the original disclosure as well as for the purpose of restricting the claimed invention, in particular also as the limit of a range indication.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• JP 7163074 A [0002]
• JP 2011182522 A [0002]
• JP 2013183492 A [0002]

Claims (7)

Rotary electric machine (M), with an annular stator core (31) having a plurality of teeth (31b) and a plurality of slots (32) respectively formed between the adjacent teeth, a coil (1) having a plurality of unit coils (11) configured by winding in a wave winding across the plurality of slots, and a rotor (2) provided to face the stator core and rotatable by receiving magnetic flux generated by energizing the coil; wherein, from the both ends of all the unit coils, which are disposed one ends on an outermost peripheral side of the stator core in the slots and the other ends are arranged on an innermost peripheral side of the stator core in the slots. Rotary electric machine behind Claim 1 wherein, in the unit coil, a coil end is formed on an end surface side of the teeth by alternately repeating a long pitch coil having a coil pitch larger than the number of slots per pole obtained by dividing the number of slots Slotting the stator core by the number of poles of the rotor, and a short-pitch winding having a coil pitch smaller than the number of slits per pole, and a coil end formed on the other end surface side of the teeth is formed by a full Division winding in which the coil pitch is equal to the number of slots per pole. Rotary electric machine behind Claim 2 in that both ends of the unit coil extend to the one end face side of the teeth. Rotary electric machine behind Claim 2 in that both ends of the unit coil extend to the other end face side of the teeth. Rotary electric machine behind Claim 1 in which, of two in-phase unit coils inserted in adjacent slots, in a unit coil, a coil end is formed on an end face side of the teeth by a long pitch coil having a coil pitch larger than the number of slots Slits per pole is obtained by dividing the number of slits of the stator core by the number of poles of the rotor, and a coil end on the other end surface side of the teeth is formed by a short-pitch winding having a coil pitch smaller is formed as a number of slots per pole, and in the other unit coil, a coil end is formed on the one end surface side of the teeth by a short pitch coil and a coil end on the other end surface side of the teeth is formed by a long pitch coil , Rotary electric machine according to one of the Claims 1 to 5 in which the unit coil is formed in a spiral shape shifted by a layer in the radial direction for each angle obtained by multiplying a value obtained by dividing 360 degrees by a parallel number in which a plurality of in-phase unit coils are electrically connected in parallel with the number of slots per pole and per phase obtained by dividing the number of slots of the stator core by the number of phases and the number of poles of the rotor. Rotary electric machine according to one of the Claims 1 to 6 in which the one end of the unit coil is configured by a neutral point of the Y connection.

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