JP5483053B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine driven by a plurality of three-phase output inverters.

  A rotating electrical machine driven by being supplied with power by a three-phase output inverter generally has a rotor that rotates around a rotation axis and a stator that surrounds the rotor. The stator has a stator core formed by a plurality of steel plates stacked in the direction of the rotation axis, and a stator coil wound around the stator core.

  In general, such a rotating electric machine is driven by a plurality of three-phase output inverters. For example, even when one three-phase output inverter stops for some reason, redundancy is provided so that the rotating electric machine can continue to be driven. Is given.

  However, when a plurality of three-phase output inverters are connected to a rotating electrical machine, the structure of the coil connection part formed at the axial end of the stator core may be complicated. When the structure of the coil connection portion becomes complicated, the axial dimension of the stator increases. As the dimension of the stator increases, the dimensions of the rotating electrical machine also increase.

  As a method for suppressing an increase in the size of a rotating electrical machine, for example, as disclosed in Patent Document 1, a method for improving the coil connection structure and reducing the size of the rotating electrical machine is known.

JP 2006-191733 A

  A plurality of partial annular conductors are arranged on the outer side in the axial direction of the stator core in order to wire a stator coil and the like. For example, when four sets of three-phase output inverters are connected to drive a rotating electrical machine, at least 24 partial annular conductors are arranged at intervals in the axial direction.

  Around these partial annular conductors, coil end portions of the stator coils, lead leads, and the like are wired in a complicated manner. For this reason, an axial direction dimension will increase. In such a case, in the above example, it may be difficult to suppress an increase in the dimension in the axial direction.

  The present invention has been made to solve the above-described problems, and an object thereof is to suppress an increase in the axial dimension of the rotating electrical machine.

This onset bright for achieving the above object, in the rotating electric machine driven by a plurality of three-phase output inverter, a rotor to rotate about an axis of rotation one axial end is connected to a load, said A steel cylinder having a surface formed so as to cover the rotor and having a surface extending perpendicularly to the rotation axis is laminated in the direction of the rotation axis, and a groove extending in the direction of the rotation axis on the inner peripheral surface of the substantially cylinder Have a plurality of stator cores formed side by side in the circumferential direction, and a plurality of sets of coils corresponding to each of the three-phase outputs from the three-phase output inverter. Phase coils are respectively inserted into the separate grooves, and the coil end portions of the three-phase coils of each of the plurality of sets are directed outward from the stator core ends on the load side and the anti-load side toward the outer side in the rotational axis direction. Rolled to extend A plurality of stator coils, each of which has conductive characteristics, and each of the stator coils is arranged in a row at a predetermined interval on the outer side in the rotational axis of the load side end portion of the stator core. , Each of the load side partial annular conductors electrically connected to each of the coil end portions on the load side, each having a conductive property, each of which is in the direction of the rotation axis of the end portion on the opposite side of the stator core A plurality of non-load-side partial annular conductors arranged on the outside at predetermined intervals and arranged in the direction of the rotation axis, each electrically connected to each of the coil end portions on the anti-load side; and the load side partial loop conductor and the anti-load side portion ring conductor being electrically connected to each possess an external electrically connectable drawn lead, the said drawer lead electricity to each of the plurality of three-phase output inverter Connected to the load-side partial annular conductor or the anti-load-side partial annular conductor electrically connected to the neutral point of the three-phase one-set coil The three-phase one set of neutral lead-out leads, and the rotating shaft extends horizontally, and the three-phase one set of inverter-side lead leads and the three-phase one set of coils are shared. The three-phase one set of neutral-point-side lead leads are arranged to face each other on both sides of the vertical plane including the rotating shaft, and the three-phase set of inverter-side lead leads and Each set of the three-phase neutral point-side lead leads is arranged around the load-side partial annular conductor or the anti-load-side partial annular conductor and at the load-side end or the anti-load-side end. Connected at positions spaced in the direction It is characterized by being.

  According to the present invention, it is possible to suppress an increase in the axial dimension of the rotating electrical machine.

1 is a schematic longitudinal sectional view showing a lower half of an axial end portion on a load side in an embodiment of a rotating electrical machine according to the present invention. FIG. 2 is a partial winding diagram of the three-phase coil in FIG. 1 showing wiring of two sets of three-phase coils. It is a schematic perspective view of the axial direction edge part of the rotary electric machine of embodiment of FIG.

  Hereinafter, an embodiment of a rotating electrical machine according to the present invention will be described with reference to FIGS. FIG. 1 is a schematic longitudinal sectional view showing a lower half of an axial end portion on a load side in the rotating electrical machine of the present embodiment. FIG. 2 is a partial winding diagram of the three-phase coil in FIG. 1 and shows wiring of two sets of three-phase coils. FIG. 3 is a schematic perspective view of an axial end portion of the rotating electrical machine of the embodiment of FIG.

  First, the configuration of the rotating electrical machine of the present embodiment will be described.

  As shown in FIG. 1, the rotating electrical machine of the present embodiment includes a rotor 2 that rotates around a horizontally extending rotary shaft 1, a stator 3 that is disposed so as to cover the rotor 2 from the outside in the radial direction, A main frame 4 that covers the stator 3 is provided. A mounting portion 5 is provided on the inner surface of the main frame 4, and the stator 3 is fixed by the mounting portion 5 and the like.

  The rotor 2 is on the load side where one end is connected to the load, and the other is on the anti-load side. The stator 3 includes a stator core 10 and a stator coil 20 that is wound around the stator core 10.

  Further, four three-phase output inverters (not shown) are connected to this rotating electric machine. The rotating electrical machine is driven by the three-phase (U-phase, V-phase, W-phase) output of each three-phase output inverter.

  The stator core 10 has a substantially cylindrical shape in which hollow disk-shaped steel plates 12 having a surface extending perpendicularly to the rotary shaft 1 are laminated in the axial direction. The rotor 2 is inserted into the cylindrical hollow portion. On the inner peripheral surface of the stator core 10, a plurality of axially extending grooves 14 are formed side by side in the circumferential direction.

  Although not shown in detail, the stator coil 20 has four sets of three-phase coils (not shown) corresponding to three-phase outputs from four three-phase output inverters. Each set of three-phase coils has three coils (U-phase coil, V-phase coil, and W-phase coil) corresponding to the three-phase outputs of one three-phase output inverter.

  Each set of three-phase coils is separately wound around a groove 14 formed on the inner periphery of the stator core 10. At least a part of the coil corresponding to one phase is wound around one groove 14 along the direction in which the groove 14 extends. The coil corresponding to one phase includes a coil side 21 housed in the groove 14 and a coil end 22 protruding in the axial direction from the groove 14.

  A coil end portion 23 is formed at the coil end 22 of each of the three-phase coils in each group to be the start or end of winding of the coil. In FIG. 1, two coil end portions 23 are shown.

  One end of the coil end portion 23 of the coil corresponding to one phase is electrically connected to the one-phase output of the three-phase output inverter (inverter side), and the other is the three-phase one set of three-phase coils. This is the side forming the neutral point (neutral point side). That is, the coil end portion 23 of the coil corresponding to one phase includes an inverter side coil end portion (not shown) and a neutral point side coil end portion (not shown). Each of the inverter side coil end portion and the neutral point side coil end portion in one phase is formed so as to extend outward from the axial end portion on the same side of the stator core 10.

  In the present embodiment, the coil end portions 23 of the three-phase coils of each of the first group and the third group are wound so as to extend outward from the end of the load-side stator core 10 in the axial direction. The coil end portions 23 of the three-phase coils of each of the second group and the fourth group are wound so as to extend outward from the end of the stator core 10 on the non-load side.

  Twelve load-side partial annular conductors (load-side circuit ring 31) having conductive properties are arranged outside the axial end of the stator core 10 on the load side. These load side circuit rings 31 are arranged side by side in the axial direction at a predetermined interval in the axial direction. The shape of the load-side circuit ring 31 is a partial annular shape in which a part of a hollow disk having a surface extending perpendicularly to the rotating shaft 1 is cut out.

  The load-side circuit ring 31 is attached to a ring fixing portion 30 or the like that extends axially outward from the load-side end of the stator core 10.

  The inverter side coil end portion and the neutral point side coil end portion of each of the three phases are electrically connected to the load side circuit ring 31 corresponding to each of the first set of three phase coils. That is, the inverter side coil end part and neutral point side coil end part of the U phase coil, the inverter side coil end part and neutral point side coil end part of the V phase coil, and the inverter side coil end part and middle of the W phase coil The six coil end portions 23 of the sex point side coil end portion are electrically connected to separate load side circuit rings 31, respectively. Therefore, at least six load-side circuit rings 31 for the first set are required.

  Similarly, the third set of three-phase coils are electrically connected. For this reason, at least twelve load-side circuit rings 31 are required as described above.

  Although not shown, an anti-load-side partial annular conductor (anti-load-side circuit ring) having conductive characteristics is provided on the outer side of the axial end of the stator core 10 on the anti-load side, similar to the load-side circuit ring 31. 12 are arranged. These anti-load side circuit rings are arranged side by side in the axial direction at a predetermined interval in the axial direction. The anti-load side circuit ring has the same shape as the load side circuit ring 31 and is attached in the same manner as the load side circuit ring 31.

  The anti-load side circuit ring corresponding to each of the second set of three-phase coils is electrically connected to the inverter-side coil end portion and the neutral point-side coil end portion of each of the three phases. The fourth set of three-phase coils are similarly connected.

  A lead lead 40 is electrically connected to each load side circuit ring 31. Similarly, the lead lead 40 is electrically connected to each anti-load side circuit ring. These lead leads 40 can be electrically connected to the outside of the rotating electrical machine. These lead leads 40 include an inverter side lead 41 that is electrically connected to each of the four three-phase output inverters, and a neutral point side lead 42 for forming a neutral point of the three-phase coil. Yes.

  The output terminals of the three phases of the first three-phase output inverter are electrically connected to the first set of three-phase coils through the inverter-side lead 41 and the load-side circuit ring 31 as follows.

  The three-phase output terminals of the first three-phase output inverter are connected to the inverter-side lead leads 41 corresponding to the three-phase outputs, respectively. Each of the inverter side lead leads 41 corresponding to these three-phase outputs is connected to each of the load side circuit rings 31 corresponding to each phase. Each load-side circuit ring 31 corresponding to each phase is connected to each inverter-side coil end portion of each phase of the first set of three-phase coils.

  Similarly to the first three-phase output inverter, each of the three-phase output terminals of the third three-phase output inverter is connected to the third set of three-phase coils via the inverter side lead 41, the load side circuit ring 31 and the like. Is electrically connected.

  The second and fourth three-phase output inverters are also electrically connected to the three-phase coils of the second group and the fourth group via anti-load side circuit rings or the like.

  On the other hand, the neutral point side coil end portion of each of the first set of three-phase coils is connected to the load-side circuit ring 31 corresponding to each of the three phases. Each load side circuit ring 31 is connected to a neutral point side lead lead 42 and connected thereto. The third set of three-phase coils are similarly connected to form a neutral point.

  The neutral point side coil end of each of the three-phase coils of the second group and the fourth group is connected via the corresponding anti-load side circuit ring and the corresponding neutral point side lead lead 42, etc. Thus, a neutral point is formed.

  The outline of the winding diagram of two sets of three-phase coils is as shown in FIG. The wiring can be simplified as compared with the case where four sets of three-phase coils are wired at one axial end of the stator core 10 as in the prior art.

  In the present embodiment, the inverter side lead lead 41 and the neutral point side lead lead 42 are arranged on both sides of the vertical plane including the rotating shaft 1 so as to face each other.

  That is, on the load side, as shown in FIG. 3, the inverter-side lead 41 of each of the first group and the third group and the neutral-point-side lead 42 of each of the first group and the third group are connected to the rotating shaft. 1 are arranged on both sides of a vertical plane including 1. Although illustration is omitted, the anti-load side is also arranged in the same manner as the load side.

  As can be seen from the above description, according to the present embodiment, the load-side circuit ring 31 and the anti-load-side circuit ring are respectively arranged on both sides of the axial end portion of the stator core 10 to form a three-phase coil. The end portion 23 and the like can be wired (connected), and two three-phase output inverters can be connected to each of the load side and the anti-load side. For this reason, the wiring structure of the stator coil 20 can be simplified compared with connecting four units to one axial end. If the wiring structure is simplified, the distance between circuit rings can be reduced. Moreover, winding of the coil end part 23 can also be simplified.

  Accordingly, it is possible to suppress an increase in the axial dimension of the rotating electrical machine.

  Further, since the inverter side lead 41 and the neutral point side lead 42 are arranged on both sides of the vertical plane including the rotary shaft 1 so as to face each other, it is easy to connect each lead 40 and the like. . Therefore, the manufacturing cost can be reduced.

  The description of the above embodiment is an example for explaining the present invention, and does not limit the invention described in the claims. Moreover, each part structure of this invention is not restricted to the said embodiment, A various deformation | transformation is possible within the technical scope as described in a claim.

  For example, although two three-phase output inverters are connected to each of the load side and the anti-load side, the present invention is not limited to this. It can be increased or decreased according to the specifications of the rotating electrical machine.

  Moreover, although the same number (two) is arrange | positioned, it does not restrict to this. When the total number of three-phase output inverters is an odd number, it is possible to connect different numbers of three-phase output inverters to the load side and the anti-load side.

DESCRIPTION OF SYMBOLS 1 ... Rotary shaft, 2 ... Rotor, 3 ... Stator, 4 ... Main frame, 5 ... Mounting part, 10 ... Stator iron core, 12 ... Steel plate, 14 ... Groove, 20 ... Stator coil, 21 ... Coil side , 22 ... coil end, 23 ... coil end part, 30 ... ring fixing part, 31 ... load side circuit ring, 40 ... drawer lead, 41 ... inverter side lead, 42 ... neutral point side lead

Claims (2)

In a rotating electrical machine driven by a plurality of three-phase output inverters,
A rotor that rotates about a rotating shaft with one axial end connected to the load;
A steel cylinder formed to cover the rotor and having a surface extending perpendicularly to the rotation axis is laminated in the direction of the rotation axis, and extends in the direction of the rotation axis on the inner peripheral surface of the cylinder. A plurality of stator cores formed with a plurality of grooves arranged side by side in the circumferential direction;
Corresponding to each of the three-phase outputs from the three-phase output inverter, a plurality of sets of coils that constitute one set of three phases, and each of the three-phase coils are inserted into the separate grooves, respectively. A stator coil wound so that coil end portions of a three-phase coil extend from the stator core end portions on the load side and the anti-load side toward the outer side in the rotation axis direction;
Each of them has conductive characteristics, and each of them is arranged on the load side end of the stator core in the direction of the rotation axis at a predetermined interval on the outer side in the direction of the rotation axis. A load-side partial annular conductor electrically connected to each of the coil end portions;
Each of them has conductive characteristics, and each of them is arranged on the outer side of the anti-load side of the stator core in the direction of the rotation axis at a predetermined interval and arranged in the direction of the rotation axis. An anti-load-side partial annular conductor electrically connected to each coil end portion on the side;
A lead lead electrically connected to each of the load-side partial annular conductor and the anti-load-side partial annular conductor, and electrically connectable to the outside;
I have a,
The drawer lead is electrically connected to one set of three-phase inverter-side drawer leads electrically connected to each of the plurality of three-phase output inverters and to a neutral point in the three-phase set of coils. A set of three-phase neutral lead-out leads connected to the load-side partial annular conductor or the anti-load-side partial annular conductor,
The rotating shaft extends horizontally, and the three-phase one set of inverter-side lead leads and the three-phase one-set coil in common with the three-phase one set of coils, It is arranged on both sides of the vertical plane including the rotation axis so as to face each other,
Each set of the three-phase one set of inverter-side lead leads and one set of three-phase neutral-side lead leads includes the load-side partial annular conductor or the anti-load-side partial annular conductor, and the load side Are connected at positions spaced from each other in the circumferential direction at the end portion or the end portion on the opposite side of the load,
Rotary electric machine characterized by and this. 2. The rotating electrical machine according to claim 1, wherein the same number of the three-phase output inverters are electrically connected to each of the load-side partial annular conductor and the anti-load-side partial annular conductor .

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