JP2007312513A - Permanent-magnet rotating electric machine and motor-driven compressor using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a permanent-magnet rotating electric machine that has less risk of the deterioration of characteristics even if axial center is displaced. <P>SOLUTION: Armature windings wound in a concentrated manner on the teeth 4 of a stator iron core 6 are divided into at least two pieces of a coil 8a1 and a coil 8a2, a coil 8b1 and a coil 8b2, a coil of 8c1 and a coil 8c2, a coil 8d1 and a coil 8d2, a coil 8e1 and a coil 8e2, and a coil 8f1 and a coil 8f2 having different number of windings for each tooth 4. These two pieces of the coils are connected in parallel for the same tooth 4, and the Y-connection is formed to constitute the armature windings. A difference in the inductive electromotive force is made small between the coils, so that a circulating current is suppressed to improve the characteristics. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a permanent magnet rotating field type rotating electrical machine, and more particularly to a permanent magnet rotating electrical machine suitable for a heat pump compressor and an electric compressor using the permanent magnet rotating electrical machine.

  In recent years, rotating field type permanent magnet type rotating electric machines having concentrated winding type armature windings are applied to electric compressors of equipment using heat pumps such as air conditioners, freezers, or showcases for refrigerated products. It is like that. Here, this concentrated winding method is a method in which armature windings are concentrated on teeth of the armature core. In the case of a rotating field type, the armature becomes a stator, and the armature winding The wire is a stator winding. In addition, a rare earth neodymium permanent magnet is usually adopted as the field magnet at this time. With regard to such a permanent magnet type rotating electrical machine, a V-shaped permanent magnet insertion hole is provided in the rotor core and the permanent magnet is disposed. At this time, from the viewpoint of improving efficiency, a recess is formed between the permanent magnets. And a method in which the iron core between the poles is removed has been proposed (see, for example, Patent Document 1).

  In the case of a permanent magnet type rotating electrical machine used for such an electric compressor, an inverter is usually used for driving the electric motor. In this case, the system efficiency is the efficiency of the motor alone and the efficiency of the inverter. Multiplication value of Therefore, from the viewpoint of improving the system efficiency, 4 poles 6 slots or 6 poles 8 slots are frequently used as the number of poles of the permanent magnet type rotating electrical machine. On the other hand, in the case of a special winding system, for example, a 14-pole 12-slot, 16-pole 18-slot, and 10-pole 12-slot concentrated winding configuration, the balance of winding impedance becomes a problem. Therefore, a method of balancing winding impedance by winding and connecting a plurality of winding elements around the same tooth (tooth profile) has been proposed as a conventional technique (see, for example, Patent Document 2).

At this time, in the case of 4 poles and 6 slots, the same coil is divided into two in the radial direction, the bottom side of the slot and the side of the slot opening, and the Y phase connection is proposed in which the coils of the same phase form 4 parallel circuits. According to these prior arts, the rotor shape of the permanent magnet type rotating electric machine for driving the electric compressor can be optimized, and a multi-layer machine (14 poles, 12 slots, 16 poles, 18 slots) can be multilayered on adjacent teeth. The impedance of each winding when the winding element is provided can be balanced.
JP 2002-78255 A JP 2001-197696 A

  However, the above prior art does not give consideration to the misalignment of the shaft center in the rotating electrical machine, and has a problem that the gap between the rotor and the stator becomes non-uniform and the characteristics deteriorate. In other words, the prior art does not touch the deviation of the axis of the permanent magnet type rotating electrical machine. Therefore, in the prior art, when the axis of the rotating electrical machine is displaced, the characteristics are degraded.

  An object of the present invention is to provide a permanent magnet type rotating electrical machine that is less likely to deteriorate in characteristics even when its axis is displaced.

  The above object is to provide a permanent magnet type rotating electric machine having a concentrated winding type armature winding in which n portions of the armature winding, which are concentrated on the teeth of the armature core, are wound in different numbers of turns. This is achieved by dividing the element into n elements and connecting the n winding elements in parallel to form the armature winding.

  Similarly, in the permanent magnet type rotating electric machine provided with the concentrated winding type armature winding, the above-described object is to provide a portion of the armature winding concentratedly wound on the teeth of the armature core with at least two different numbers of windings. This is achieved by dividing the winding elements and connecting the at least two winding elements in parallel to form the armature winding.

  Similarly, in the permanent magnet type rotating electric machine having the concentrated winding type armature winding, the above-described object is to provide at least three portions of the armature winding that are concentrated on the teeth of the armature core with different winding numbers. This is achieved by dividing the winding elements and connecting the at least three winding elements in parallel to form the armature winding.

  Similarly, in the permanent magnet type rotating electric machine having the concentrated winding type armature winding, the above-described object is to provide at least four portions of the armature winding that are concentrated wound on the teeth of the armature core with different winding numbers. This is achieved by dividing into winding elements and connecting the at least four winding elements in parallel to form the armature winding.

  Similarly, in the permanent magnet type rotary electric machine having double armature windings by concentrated winding Y connection, the above-mentioned purpose is to divide the portion of the armature windings concentrated on the teeth of the armature core, Are divided into 2n winding elements different from each other, n of these 2n winding elements wound around the same tooth are connected in parallel and then connected in Y connection, and one Y connection winding This is achieved by configuring the armature winding by a wire and the other Y-connection winding.

  At this time, the neutral point of the one Y-connection winding and the neutral point of the other Y-connection winding are not connected anywhere, and the above object is achieved even if both are left floating. .

  According to the present invention, due to the winding method and the connection method of the armature winding, even when the rotor rotates in an eccentric rotation state, no induced electromotive force deviation occurs between the phase windings. Can be prevented. In addition, even if an induced electromotive force deviation occurs, the neutral point is not connected, and the parallel circuit resistance is increased, so that the circulating current itself is reduced, so that a permanent magnet type rotating electrical machine capable of improving the characteristics can be obtained. There is.

  Hereinafter, a permanent magnet type rotating electrical machine according to the present invention and an electric compressor using the same will be described in detail with reference to embodiments shown in the drawings. In addition, in each figure, the common code | symbol shows the same thing. In the following embodiments, the present invention is applied to a four-pole permanent magnet type rotating electrical machine, and the case where the ratio between the number of poles of the rotor and the number of slots of the stator is set to 2: 3 will be described. First, an electric compressor to which an embodiment of a permanent magnet type rotating electrical machine according to the present invention is applied will be described with reference to FIG.

  The electric compressor 40 shown in FIG. 3 is a hermetic compressor used for an air conditioner, for example, and is entirely sealed in a case. The case is configured as a sealed container by a cylindrical frame 30, an upper lid 31 on the upper end side, and a lower lid 32 on the lower end side, and the permanent magnet type rotating electrical machine 1 is included in the frame 30. And the compression element 50 is accommodated. At this time, as shown in FIG. 4, the frame 30 is formed by bending a thick steel plate 300 (thickness 3 to 5 mm) from both ends in the P direction, forming a cylindrical shape, and welding the mating surfaces (welding points 301). The upper lid 31 and the lower lid 32 are welded together to form a sealed container.

  The electric compressor 40 shown in FIG. 3 is a case where a scroll compressor is applied. For this reason, the compression element 50 includes a spiral wrap 53 standing upright on the end plate 52 of the fixed scroll member 51, and an orbiting scroll. The revolving scroll member 54 is swung by the crank rotating shaft 16 after meshing with the spiral wrap 56 standing upright on the end plate 55 of the member 54, so that the compression operation is performed. The orbiting motion at this time is given by the fact that the axial center position of the crank rotating shaft 16 engaged with the orbiting scroll member 54 is different from the axial center position of the rotating shaft 16 a of the permanent magnet type rotating electrical machine 1.

  In this scroll compressor, a compression chamber 57 (57a, 57b,...) Is formed by the fixed scroll member 51 and the orbiting scroll member. And the compression chamber located in the outermost diameter side in this compression chamber moves toward the center of both scroll members 51 and 54 with a turning motion, and a volume reduces gradually. Therefore, when the compression chambers 57 a and 57 b reach the vicinity of the centers of the scroll members 51 and 54, the gas sucked from the suction pipe 58 in the compression chambers 57 is compressed and compressed from the discharge port 59 communicating with the compression chamber 57. The discharged gas is discharged, and the discharged compressed gas passes through gas passages (not shown) provided in the fixed scroll member 51 and the fixed member 60 to reach the frame 30 below the fixed member 60, and the side wall of the frame 30. Is discharged out of the electric compressor 40 from a discharge pipe 61 provided in

  At this time, the permanent magnet type rotating electrical machine 1 is supplied with power from a separate inverter (not shown), rotates in a state controlled at a rotation speed suitable for the compression operation, and drives the orbiting scroll member 54 to orbit. For this reason, the permanent magnet type rotating electrical machine 1 includes a stator 2 and a rotor 3, and the rotor 3 is shrink-fitted and fitted to the rotating shaft 16 a. The rotating shaft 16 a includes the crank rotating shaft 16 on the upper side thereof, and this is engaged with the orbiting scroll member 54. Further, an oil hole 62 is formed inside the rotary shaft 16a, and when the rotary shaft 16a rotates, the lubricating oil stored in the oil reservoir 63 at the lower part of the frame 30 is a sliding bearing through the oil hole 62. It is supplied to the upper bearing portion 64 of the type and the lower bearing portion 65 of the ball bearing type.

  The permanent magnet type rotating electrical machine 1 rotates when three-phase AC power is supplied to the stator winding 8. Accordingly, it is necessary to supply the stator winding 8, but the stator winding is sealed in the frame 30. Therefore, a terminal 66 is provided on the frame 30 in order to supply power to this from the outside. On the other hand, the lower lid 32 is provided with a pedestal 67 for installing the electric compressor 40. Further, the rotating shaft 16a of the permanent magnet type rotating electrical machine 1 is formed with the crank rotating shaft 16, and therefore the shaft center is different, so that the balance of the rotor 3 is lost. Therefore, counterweights 68 (68a, 68b) are attached to both sides of the rotor 3 so as to be balanced.

  Incidentally, as described with reference to FIG. 4, the frame 30 is formed with a cylindrical shape by bending the plate-shaped steel plate 300, so that the accuracy with respect to the inner diameter is small, and the diameter is usually ± 20. The order of microns is fluctuating. Further, since the stator core 6 of the stator 2 is shrink-fitted into the frame 30, the tightening margin is 0 so that the stator 2 is firmly held in the frame 30 at this time. About 1 mm is provided. In assembling the electric compressor, first, the stator 6 is shrink-fitted into the frame 30, and then the compression element 50 is attached to the frame 30.

  At this time, the gap between the outer peripheral surface of the rotor 3 and the inner peripheral surface of the stator core 6 is adjusted to be uniform, and then the ball bearing type lower bearing portion 65 is fixed to the frame 30. However, at this time, since the above-described tightening allowance is necessary, the inner diameter of the frame 30 is made smaller by about 0.1 mm than the outer diameter of the stator core 6 and the inner diameter roundness of the frame 30 is poor. It is inevitable that the gap (gap) between the stator 2 and the rotor 3 fluctuates by about 0.1 to 0.2 mm. Therefore, in the prior art, the characteristics of the permanent magnet type rotating electrical machine are deteriorated. However, as described below, this can be suppressed according to the embodiment of the present invention.

First Embodiment FIG. 1 is a cross-sectional view showing a first embodiment of a permanent magnet type rotating electric machine according to the present invention. First, the stator 2 includes a stator core 6 and an armature winding 8. It is comprised by. At this time, the teeth 4 and the core back 5 are formed on the stator core 6, and the armature winding 8 is concentratedly wound on the teeth 4 of the stator core 6. Here, the armature winding 8 is accommodated in the slot 7 between the teeth 4 by the U-phase windings 8a and 8d, the V-phase windings 8b and 8e, and the W-phase windings 8c and 8f. Thus, a three-phase winding is configured. As described above, since the permanent magnet type rotating electrical machine 1 has four poles and six slots, the slot pitch is 120 degrees in electrical angle.

  Next, the rotor 3 includes a rotor core 10 in which a shaft hole 9 is formed. A single-letter-shaped permanent magnet insertion hole 11 is formed in the vicinity of the outer peripheral surface of the rotor core. A magnet 12 is inserted and fixed to the rotor core 10. As will be described in detail later, in this figure, an imbalance indicated by “g1> g2” appears in the gap g2 on the opposite side of the gap g1 with respect to the gap between the stator 2 and the rotor 3. The situation is shown. Here, the feature of the embodiment of FIG. 1 lies in the configuration and connection method of the coil (winding element) of the armature winding 8 as shown.

  First, one U-phase winding 8 is divided into two coils, a coil 8a1 wound outward and a coil 8a2 wound around the teeth 4, and the other U-phase winding 8 is also The coil 4 is divided into two coils, that is, a coil 8 d 1 wound outward with respect to the tooth 4 and a coil 8 d 2 wound inside. Next, one V-phase winding 8 is divided into two, a coil 8b1 wound outward with respect to the tooth 4 and a coil 8b2 wound inside, and the other V-phase winding 8 is also formed. The coil 8e1 is wound around the teeth 4 and the coil 8e2 is wound inside. Also, one W-phase winding 8 is divided into two, a coil 8c1 wound around the teeth 4 and a coil 8c2 wound inside, and the other W-phase winding 8 is also The coil 4 is divided into two coils, that is, a coil 8 f 1 wound outward with respect to the tooth 4 and a coil 8 f 2 wound inside.

  Then, as shown in FIG. 2, first, the U-phase coil 8a1 and the coil 8a2, and the coil 8d1 and the coil 8d2 are respectively connected in parallel, and these are connected in series to form a Y-phase U-phase winding. To do. Next, the V-phase coil 8c1 and the coil 8c2, and the coil 8f1 and the coil 8f2 are connected in parallel, and these are connected in series to form a Y-connected V-phase winding. Furthermore, the W-phase coil 8b1 and the coil 8b2, and the coil 8e1 and the coil 8e2 are connected in parallel, and these are connected in series to form a Y-connected W-phase winding.

  The above is the feature of this embodiment, and the number of turns (the number of turns) of the coils 8a1, 8b1, 8c1, 8d1, 8e1, and 8f1 that are further wound outwardly on the teeth 4 on this, Similarly, the coils 8a2, 8b2, 8c2, 8d2, 8e2, and 8f2 wound inside are different in number of turns. Specifically, each coil is wound outside the teeth 4. The number of turns (number of turns) of each of the coils 8a1, 8b1, 8c1, 8d1, 8e1, and 8f1 is larger than the number of turns of each of the coils 8a2, 8b2, 8c2, 8d2, 8e2, and 8f2 that are also wound inside. Increase it a predetermined number of times. Although the predetermined number of times at this time will be described in detail later, each of the one coil 8a1, 8b1, 8c1, 8d1, 8e1, 8f1 and the other coil 8a2, 8b2, 8c2, 8d2, 8e2, 8f2 The number of times is such that each electromotive force is substantially equal.

  Next, the operation and effect of this embodiment will be described. As already described with reference to FIG. 3, the electric compressor 40 determines the position of the rotor 3 on the basis of the inner diameter of the stator 2, and as a result, As described above, the gap between the stator 2 and the rotor 3 may fluctuate, and the rotation center of the rotor 3 may be eccentric. For example, when the direction shown in FIG. 1 is decentered, gap g1> gap g2. At this time, since the number of magnetic fluxes decreases in the U phase on the gap g1 side and increases in the U phase on the gap g2 side, the induced electromotive force of the coils 8d1 and 8d2 increases, and the induction of the coils 8d1 and 8d2 occurs. The electromotive force is reduced.

  Here, in the prior art, as shown in FIG. 8, assuming that coils 8a1, 8a2, 8d1, and 8d2 are connected in parallel in the case of a U-phase winding, for example, in each phase winding, coils 8a1, 8a2 , 8d1, and 8d2, a circulating current flows, and the characteristics of the permanent magnet type rotating electrical machine 1 deteriorate.

  This will be described in detail. In the above-described electric compressor, a compression element (compression mechanism) 50 such as a scroll compressor or a rotary compressor is housed in the same frame 30 as that of the permanent magnet type rotating electrical machine 1. As described with reference to FIG. 4, the flat plate 300 is bent into a cylindrical shape and welded. Therefore, it is difficult to maintain the accuracy of the inner peripheral dimension. In addition, since the stator 2 of the permanent magnet type rotating electrical machine is shrink-fitted in the frame 30, there is a tightening margin of about 0.1 mm. Therefore, after the shrink-fitting, the inner diameter of the stator core 6 is 0. Deforms about 1 to 0.2 mm. And since the axial center position of the rotor 3 is determined on the basis of the internal diameter of this stator iron core 6, the rotor 3 will be eccentric.

  When the rotor 3 is eccentric in this way, a difference is generated in the electromotive force induced between the coils of the same phase when rotating. Here, when driven by an inverter device, the current is likely to flow through a coil having a small induced electromotive force, and is difficult to flow through a coil having a large induced electromotive force. In this case, the current from the inverter device becomes unbalanced. As a result, torque pulsation occurs or a circulating current flows between the coils, and the characteristics of the permanent magnet type rotating electrical machine 1 deteriorate. It will end up.

  On the other hand, in the case of this embodiment, each coil is connected as shown in FIG. 2, and the coils 8 a 1, 8 b 1, 8 c 1 wound around the teeth 4 are wound here. The number of turns (number of turns) of 8d1, 8e1, and 8f1 is different from the number of turns of coils 8a2, 8b2, 8c2, 8d2, 8e2, and 8f2 that are also wound inward.

  As a result, as shown in FIG. 2, the induced electromotive force Ea1 of the coil close to the tooth 4 and the induced electromotive force Ea2 of the far coil can be made substantially equal, that is, “Ea1≈Ea2”. Also, the induced electromotive force difference that appears as a result of the gap g1> gap g2 due to the eccentricity of the axial position, that is, “Ea1, Ea2 <Ed1, Ed2” is also the sum of these induced electromotive forces, Ea1 + Ed1 and Ea2 + Ed2. Alternatively, since the sum of Ea1 + Ed2 and Ea2 + Ed1 is equal, there is no deviation of the induced electromotive force in each phase, and the circulation current can be suppressed.

  Therefore, according to the first embodiment, even if the rotor 3 rotates in an eccentric state, no circulating current is generated in the armature winding, so that the characteristics are deteriorated even if the axis is displaced. A permanent magnet type rotating electrical machine with less fear can be obtained.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIG. Here, the difference between the embodiment of FIG. 5 and the first embodiment described with reference to FIGS. 1 and 2 is the number of divisions of the armature winding 8, and the other points are the same. That is, in the embodiment of FIG. 5, the winding 8 of each phase is divided into three, and for each phase, the coils 8 a 1, 8 b 1, 8 c 1, 8 d 1, 8 e 1, 8 f 1 and the coils 8 a 2, in order from the outside of the teeth 4. 8b2, 8c2, 8d2, 8e2, and 8f2, and coils 8a3, 8b3, 8c3, 8d3, 8e3, and 8f3 are wound thereon, which is different from the first embodiment. In FIG. 5, the rotor is omitted.

  At this time, the number of turns of each coil is increased sequentially from the tooth 4 side, and the coils 8a1, 8b1, 8c1, 8d1, 8e1, 8f1 to 8a2, 8b2, 8c2, 8d2, 8e2, 8f2, In addition, the number of turns is increased in the order of the coils 8a3, 8b3, 8c3, 8d3, 8e3, 8f3, and the induced electromotive force is made equal in each phase, as in the case of the first embodiment. The same is true in that the windings of each phase are Y-connected.

Third Embodiment Next, a third embodiment of the present invention will be described with reference to FIG. Here, this embodiment of FIG. 6 also differs from the first embodiment described with reference to FIGS. 1 and 2 in the number of divisions of the armature winding 8, and the other points are the same. That is, in the embodiment of FIG. 6, the winding 8 of each phase is divided into four, and for each phase, the coils 8 a 1, 8 b 1, 8 c 1, 8 d 1, 8 e 1, 8 f 1 and the coils 8 a 2, in order from the outside of the teeth 4. 8b2, 8c2, 8d2, 8e2, 8f2, coils 8a3, 8b3, 8c3, 8d3, 8e3, 8f3, and coils 8a4, 8b4, 8c4, 8d4, 8e4, 8f4 are wound. In FIG. 6, the rotor is omitted.

  At this time, the number of turns of each coil is also increased sequentially from the teeth 4 side, and the coils 8a1, 8b1, 8c1, 8d1, 8e1, 8f1 to coils 8a2, 8b2, 8c2, 8d2, 8e2, 8f2, coils 8a3, 8b3, 8c3, 8d3, 8e3, 8f3, and coils 8a4, 8b4, 8c4, 8d4, 8e4, 8f4 are increased in turn in this order, and the induced electromotive force is equivalent in each phase. This is the same as in the first embodiment, and the same is true in that the windings of each phase are Y-connected.

  In the embodiment of FIG. 6, each coil is connected as shown in FIG. 8, but in this case, the number of turns of each coil is different. Therefore, according to the second and third embodiments, the induced electromotive force of the coil close to the tooth 4 and the induced electromotive force of the far coil are substantially equal, and the eccentric rotation state is obtained. As a result, according to the second embodiment and the third embodiment, even if the number of divisions of the coil is increased, the induction electromotive force deviation can be prevented from occurring between the phase windings. A permanent magnet type rotating electrical machine can be obtained in which current can be prevented and characteristics are less likely to deteriorate even if the axis is misaligned.

Fourth Embodiment Next, similarly, a fourth embodiment of the present invention will be described with reference to FIG. 7. The embodiment of FIG. 7 is the same as the first embodiment described with reference to FIGS. It is the same in that it has a winding configuration with divided coils, and the number of turns of each winding is changed at this time, and the difference is that the armature is different as is apparent from FIG. As shown in the figure, the Y connection is divided into two systems, and the portion concentrated on the teeth of the armature core is divided into 2n winding elements with different numbers of turns. Of these 2n winding elements, n pieces wound around the same tooth are connected in parallel and then Y-connected, respectively, and one Y-connected winding and the other Y-connected winding It is characterized by the armature winding.

  For this reason, the armature winding 8 includes U-phase windings 8a1, 8a2, 8d1, and 8d2 in which the number of turns is reduced from the inside close to the teeth 4 to the outside, and the V-phase windings 8b1, 8b2, 8c1, and 8c2. And W-phase windings 8e1, 8e2, 8f1, and 8f2. Therefore, in this case, n = 2. First, after connecting the U-phase windings 8a1 and 8a2 and the V-phase windings 8b1 and 8b2 and the W-phase windings 8c1 and 8c2 in parallel, they are star-connected to form one Y-phase connection Y1, Next, U-phase windings 8d1 and 8d2, V-phase windings 8e1 and 8e2, and W-phase windings 8f1 and 8f2 are connected in parallel, and these are also star-connected to form the other Y-phase connection Y2. . The neutral point of the Y-phase connection line Y1 and the neutral point of the Y-phase connection line Y2 are not connected anywhere, and both are left floating.

  Therefore, also according to the fourth embodiment, the induced electromotive force of the coil close to the tooth 4 and the induced electromotive force of the far coil are substantially equal, and even if the eccentric rotation state occurs, the phase windings As a result, even if the number of coil divisions is increased, circulating current is prevented, and even if the axis is misaligned, the permanent magnet is less likely to deteriorate in characteristics. A rotary electric machine can be obtained. In addition, according to the fourth embodiment, since the neutral point of the Y-phase connection of the two systems is not connected anywhere, the parallel circuit resistance is increased, and thus the circulating current is also suppressed in this respect. Therefore, it is possible to obtain a permanent magnet type rotating electrical machine that is less likely to deteriorate the characteristics even if the axis is displaced.

  By the way, in each of the embodiments described above, the case of a single wire as the armature winding has been described. However, a plurality of winding coils of each layer of the multilayer winding may be configured, and even in this case, the circulating current is suppressed. However, there is no change in that the circulating current can be reduced. Moreover, although the case where the scroll compressor is applied as the compression element has been described in the above embodiment, it goes without saying that the application is not limited to the scroll compressor or the application target of the permanent magnet type rotating electrical machine according to the present invention. Needless to say, the present invention may be applied to a compressor such as a reciprocating compressor, and of course the drive target is not limited to the compressor.

1 is a cross-sectional view showing a first embodiment of a permanent magnet type rotating electric machine according to the present invention. It is a connection diagram of the armature winding by the 1st Embodiment of the present invention. It is sectional drawing which shows an example of the electric compressor carrying a permanent magnet type rotary electric machine. It is explanatory drawing which shows an example of the frame manufacturing method of an electric compressor. It is sectional drawing which shows 2nd Embodiment of the permanent-magnet-type rotary electric machine by this invention. It is sectional drawing which shows 3rd Embodiment of the permanent-magnet-type rotary electric machine by this invention. It is a connection diagram of the armature winding by the 4th Embodiment of this invention. It is a connection diagram by the 3rd Embodiment of this invention.

Explanation of symbols

1: Permanent magnet type rotating electrical machine 2: Stator 3: Rotor 4: Teeth 5: Core back 6: Stator core 7: Slot 8: Armature winding 9: Shaft hole 10: Rotor core 11: Permanent magnet insertion Hole 12: Neodymium permanent magnet 16: Crank rotation shaft 16a: Rotation shaft 30: Frame 31: Upper lid 32: Lower lid 40: Electric compressor 50: Compression element 51: Fixed scroll member 52: End plate 53: Spiral wrap 54: Orbiting scroll member 55: End plate 56: Spiral wrap 57: Compression chamber 58: Suction pipe 59: Discharge port 60: Fixing member 61: Discharge pipe 62: Oil hole 63: Oil reservoir part 64: Upper bearing part 65: Lower side Bearing part 66: Terminal 67: Pedestal 68: Counterweight.

Claims (7)

In the permanent magnet type rotating electrical machine with concentrated winding type armature winding,
Dividing the portion of the armature winding concentrated on the teeth of the armature core into n winding elements having different turns,
A permanent magnet type rotating electrical machine, wherein the n armature windings are configured by connecting these n winding elements in parallel. In the permanent magnet type rotating electrical machine with concentrated winding type armature winding,
A portion of the armature winding that is concentrated on the teeth of the armature core is divided into at least two winding elements having different winding numbers,
A permanent magnet type rotating electrical machine, wherein the armature winding is configured by connecting at least two winding elements in parallel. In the permanent magnet type rotating electrical machine with concentrated winding type armature winding,
Dividing the portion of the armature winding concentrated on the teeth of the armature core into at least three winding elements having different winding numbers;
A permanent magnet type rotating electrical machine, wherein the armature winding is configured by connecting at least three winding elements in parallel. In the permanent magnet type rotating electrical machine with concentrated winding type armature winding,
Dividing the portion of the armature winding concentrated on the teeth of the armature core into at least four winding elements having different turns,
A permanent magnet type rotating electrical machine characterized in that the armature winding is configured by connecting at least four winding elements in parallel. In a permanent magnet type rotating electrical machine with double armature windings by concentrated winding Y connection,
Dividing a portion of the armature windings concentrated on the teeth of the armature core into 2n winding elements having different winding numbers,
Of these 2n winding elements, n pieces wound around the same tooth are connected in parallel and then connected in Y connection, and the Y electric connection winding and the other Y connection winding make the electric machine A permanent magnet type rotating electric machine characterized in that a child winding is formed. In the permanent magnet type rotating electrical machine according to claim 5,
A permanent magnet type rotating electrical machine characterized in that the neutral point of the one Y-connection winding and the neutral point of the other Y-connection winding are not connected anywhere and are left floating. .   An electric compressor comprising the permanent magnet type rotating electric machine according to any one of claims 1 to 5.

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