JPWO2017085861A1 - Rotating electric machine - Google Patents

Abstract

The present invention provides a rotating electrical machine that can suppress the generation of noise even if there is a difference in the amplitude of an alternating current supplied to two sets of three-phase windings. In the rotating electrical machine according to the present invention, a rotor having a magnetic pole number of 8n (n is an integer of 1 or more) and 12n teeth protrude radially inward from the inner peripheral surface of the annular yoke, Stator winding provided with first and second three-phase windings formed by alternating current connection of stator cores arranged at equiangular pitches in the circumferential direction and concentrated winding coils mounted on the teeth. A concentrated winding coil comprising: a wire; and first and second three-phase AC circuits that feed power to the first and second three-phase windings, respectively, and constituting the first three-phase winding; The concentrated winding coils constituting the second three-phase winding are alternately arranged in the circumferential direction, the phases of the concentrated winding coils mounted on the teeth adjacent in the circumferential direction are different, and the stator core The phase of the concentrated winding coil mounted on the teeth facing each other across the axis is Flip it.

Description

  The present invention relates to a rotating electrical machine such as an electric motor or a generator.

  Conventionally, two independent three-phase AC circuits are provided, the stator winding is composed of two sets of three-phase windings, and power is supplied to each of the two sets of three-phase windings by a dedicated three-phase AC circuit. A rotating electric machine configured as described above has been known.

  For example, in the conventional rotating electric machine described in Patent Document 1, concentrated winding coils wound around each of 12 teeth are arranged in the circumferential order in the U1, U1, V1, V1, and W1 phases. , W1 phase, U2 phase, U2 phase, V2 phase, V2 phase, W2 phase, W2 phase, and the first three phases by concentrated winding coils of U1, U1, W1, W1, V1, V1 and V1 phases A winding was constituted, and a second three-phase winding was constituted by concentrated winding coils of U2, U2, W2, W2, V2, and V2 phases.

  Moreover, in the conventional rotating electrical machine described in Patent Document 2, concentrated winding coils wound around each of the six teeth are arranged in the circumferential direction in the order of U1, W2, V1, U2, and W1 phases. , V2 phase, U1 phase, W1 phase and V1 phase concentrated winding coils constitute a first three phase winding, and W2, U2 phase and V2 phase concentrated winding coils constitute a second three phase winding. It was composed.

JP2013-236455A Japanese Patent No. 4123425

  In the conventional rotating electric machine described in Patent Document 1, the concentrated winding coil constituting the first three-phase winding is wound around a group of teeth existing in a half region in the circumferential direction, and the second three-phase winding. Are wound around a group of teeth existing in the remaining half region in the circumferential direction. Therefore, when a difference occurs in the amplitude of the alternating current supplied to the first and second three-phase windings, half of the circumferential direction around which the concentrated winding coils constituting the first three-phase windings are wound. Magnetic attraction generated in the teeth group existing in the region, and magnetic attraction generated in the teeth group existing in the remaining half region in the circumferential direction around which the concentrated winding coil constituting the second three-phase winding is wound There is a difference between force. Accordingly, there is a problem that the rotor is eccentric and noise is generated.

  Further, in the conventional rotating electric machine described in Patent Document 2, concentrated winding coils constituting different three-phase windings are wound on the teeth facing each other across the axis of the stator core. When a difference occurs in the amplitude of the alternating current supplied to the first and second three-phase windings, a difference occurs in the magnetic attractive force generated in the teeth facing each other across the axis of the stator core. Accordingly, there is a problem that the rotor is eccentric and noise is generated.

  The present invention has been made to solve the above-described problems, and a rotating electrical machine capable of suppressing the generation of noise even if a difference occurs in the amplitude of an alternating current supplied to two sets of three-phase windings. The purpose is to obtain.

  The rotating electrical machine according to the present invention has a rotor having a number of magnetic poles of 8n (n is an integer of 1 or more), an annular yoke, and an inner circumferential surface of the annular yoke that protrudes radially inward. A stator core provided with 12n teeth arranged at an equiangular pitch in the circumferential direction, with a certain clearance between the teeth and the rotor arranged coaxially on the outer circumference of the rotor; The first three-phase winding constituted by AC connection of half of the concentrated winding coils mounted on each of the teeth and the remaining concentrated coil of the concentrated winding coil are AC connected. A stator winding having a second three-phase winding that is configured, a first three-phase AC circuit that feeds power to the first three-phase winding, and a power feed to the second three-phase winding. A second three-phase AC circuit. The concentrated winding coil constituting the first three-phase winding and the concentrated winding coil constituting the second three-phase winding are mounted on the teeth and alternately arranged in the circumferential direction, The phases of the concentrated winding coils mounted on the teeth adjacent in the circumferential direction are different, and the phases of the concentrated winding coils mounted on the teeth facing each other across the axis of the stator core are the same.

  In this invention, the concentrated winding coil constituting the first three-phase winding and the concentrated winding coil constituting the second three-phase winding are mounted on the teeth and alternately arranged in the circumferential direction. Since the phases of the concentrated winding coils mounted on the teeth adjacent in the direction are different, a difference is generated in the magnetic attractive force generated in the teeth adjacent in the circumferential direction. Therefore, the teeth that generate magnetic attractive forces of different sizes are distributed without being biased in the circumferential direction, so the order of the ring vibration generated in the stator core due to the magnetic attractive force is increased, and the vibration is It becomes difficult to generate and the generation of noise is suppressed. Furthermore, since the force resulting from the magnetic attraction force acts on the rotor center evenly from the circumferential direction, the occurrence of eccentricity of the rotor is suppressed, and the generation of noise is suppressed.

  In addition, since the concentrated winding coils mounted on the teeth facing each other across the stator core axis are the same phase of the same three-phase winding, the teeth facing the stator core axis are The same amount of magnetic attractive force is generated in the opposite direction. As a result, the forces acting on the rotor shaft due to the magnetic attractive force generated on the teeth facing each other across the stator core axis cancel each other, and the occurrence of rotor eccentricity is suppressed and noise is reduced. Is suppressed.

It is a cross-sectional view which shows the rotary electric machine which concerns on Embodiment 1 of this invention. It is an electric circuit diagram in the rotary electric machine which concerns on Embodiment 1 of this invention. It is a figure which shows the electric current waveform which flows into the 1st three-phase alternating current circuit in the rotary electric machine which concerns on Embodiment 1 of this invention. It is a figure which shows the 1st specific example of the current waveform which flows into the 2nd three-phase alternating current circuit in the rotary electric machine which concerns on Embodiment 1 of this invention. It is a figure which shows the 2nd specific example of the current waveform which flows into the 2nd three-phase alternating current circuit in the rotary electric machine which concerns on Embodiment 1 of this invention. It is a figure which shows the 3rd specific example of the current waveform which flows into the 2nd three-phase alternating current circuit in the rotary electric machine which concerns on Embodiment 1 of this invention. It is a figure which shows the magnetic attraction force which generate | occur | produces in the teeth 13 when the electric current waveform of a 2nd electric current waveform mode is sent through the rotary electric machine which concerns on Embodiment 1 of this invention. It is a figure which shows the magnetic attraction force which generate | occur | produces in the teeth at the time of flowing the current waveform of the 2nd current waveform mode through the 1st conventional rotary electric machine. It is a figure which shows the magnetic attraction force which generate | occur | produces in the teeth at the time of flowing the current waveform of the 2nd current waveform mode through the 2nd conventional rotary electric machine. It is an electric circuit diagram in the rotary electric machine which concerns on Embodiment 2 of this invention.

Embodiment 1 FIG.
1 is a transverse sectional view showing a rotating electrical machine according to Embodiment 1 of the present invention, and FIG. 2 is an electric circuit diagram of the rotating electrical machine according to Embodiment 1 of the present invention. In addition, a cross-sectional view is a cross-sectional view in a plane orthogonal to the axis of the rotating shaft of the rotating electrical machine. In FIG. 1, hatching is omitted for convenience.

  In FIG. 1, a rotating electrical machine 100 has a housing that surrounds the rotor 1 by securing a certain gap between the rotor 1 disposed in a housing (not shown) and the rotor 1. And a stator 10 held coaxially therewith.

  The rotor 1 includes a rotor core 3 fixed to a rotation shaft 2 inserted at an axial center position, and a magnet 5 accommodated in a magnet accommodation hole 4 penetrating the outer periphery of the rotor core 3 in the axial direction. It is equipped with. Here, eight magnets 5 are arranged at an equiangular pitch in the circumferential direction on the outer peripheral side of the rotor core 3.

  The stator 10 includes 12 stator cores 11 each having teeth 13 protruding radially inward from an inner circumferential surface of a yoke 12 configured in an annular shape and arranged at equiangular pitches in the circumferential direction. The stator winding 15 composed of the concentrated winding coil 16 produced by winding the conductor wire around the teeth 13 a plurality of times, and the insulator interposed between the stator core 11 and the concentrated winding coil 16. (Not shown).

  Here, the concentrated winding coil 16 has the U11 phase, V21 phase, W11 phase, U21 phase, V11 phase, W21 phase, U12 phase, V22 phase, W12 phase, U22 phase, V12 phase in the order in which the teeth 13 are arranged in the circumferential direction. , W22 phase. The U11 phase and U12 phase concentrated winding coils 16 are connected in series to form a U1 phase coil, the V11 phase and V12 phase concentrated winding coils 16 are connected in series to form a V1 phase coil, and the W11 phase and W12 phase The concentrated winding coil 16 is connected in series to form a W1-phase coil. Then, the U1-phase coil, the V1-phase coil, and the W1-phase coil are star-connected as an AC connection to constitute the first three-phase winding 151.

  The U21 phase and U22 phase concentrated winding coils 16 are connected in series to form a U2 phase coil, the V21 phase and V22 phase concentrated winding coils 16 are connected in series to form a V2 phase coil, and W21 and W22 phase concentrated windings. The coil 16 is connected in series to form a W2-phase coil. Then, the U2-phase coil, the V2-phase coil, and the W2-phase coil are star-connected to constitute the second three-phase winding 152.

  As described above, the stator winding 15 is composed of the first three-phase winding 151 and the second three-phase winding 152.

  The rotating electrical machine 100 includes a three-phase AC circuit 17 and a control circuit 20, as shown in FIG.

  The three-phase AC circuit 17 includes a first three-phase AC circuit 171 that supplies power to the first three-phase winding 151, and a second three-phase AC circuit 172 that supplies power to the second three-phase winding 152. Prepare. Each of the first three-phase AC circuit 171 and the second three-phase AC circuit 172 includes three sets of switching elements 18 and diodes 19 connected in parallel and arranged in parallel. It is a configured inverter circuit.

  Connection points for connecting two sets of the switching element 18 and the diode 19 connected in parallel to each other are connected to the feeding portions of the U1-phase coil, the V1-phase coil, and the W1-phase coil via the feeder line 23, respectively. Yes. The current sensor 21 is disposed so as to detect a current value flowing from the first three-phase AC circuit 171 to each of the power supply lines 23 to the power supply units of the U1-phase coil and the W1-phase coil.

  Moreover, the connection point which connects two sets of the switching element 18 connected in parallel and the diode 19 in series is connected to the feeding part of the U2-phase coil, the V2-phase coil and the W2-phase coil via the feeder line 23, respectively. Has been. The current sensor 21 is disposed so as to detect a current value flowing from the second three-phase AC circuit 172 to each of the power supply lines 23 to the power supply portions of the U2-phase coil and the W2-phase coil.

  The control circuit 20 includes a first three-phase AC circuit 171 and a second three-phase AC circuit 172 based on the current value obtained from the current sensor 21 and the rotation angle of the rotor 1 obtained from the rotation sensor 22. And drive control. Then, the switching elements 18 of the first and second three-phase AC circuits 171 and 172 are ON / OFF controlled by the control circuit 20, and the DC power of the power supply 24 is converted into three-phase AC power. This three-phase AC power is supplied to the first and second three-phase windings 151 and 152 via the feeder line 23. Then, a rotating magnetic field is applied around the magnet 5 of the rotor 1, and the rotor 1 is driven to rotate.

  In the rotating electrical machine 100 configured as described above, the first three-phase winding 151 and the second three-phase winding 152 are respectively provided with independent first three-phase AC circuit 171 and second three-phase AC. AC power is supplied from the circuit 172. Therefore, if a detection error of the current sensor 21 occurs, or if the switching specification of the switching element 18 or the ON resistance varies between the first three-phase AC circuit 171 and the second three-phase AC circuit 172, An imbalance occurs in the current flowing through the first three-phase winding 151 and the second three-phase winding 152.

  Here, the waveform of the current flowing through the first three-phase winding 151 and the second three-phase winding 152 will be described with reference to FIGS. FIG. 3 is a diagram showing a waveform of a current flowing through the first three-phase AC circuit in the rotary electric machine according to Embodiment 1 of the present invention, and FIG. 4 is a second three-phase in the rotary electric machine according to Embodiment 1 of the present invention. FIG. 5 is a diagram showing a first specific example of a current waveform flowing in an AC circuit, and FIG. 5 shows a second specific example of a current waveform flowing in a second three-phase AC circuit in the rotary electric machine according to Embodiment 1 of the present invention. FIG. 6 and FIG. 6 are diagrams showing a third specific example of a current waveform flowing in the second three-phase AC circuit in the rotary electric machine according to Embodiment 1 of the present invention.

  The first current waveform mode is a case where the current waveform shown in FIG. 3 flows in the first three-phase winding 151 and the current waveform shown in FIG. 4 flows in the second three-phase winding 152. This first current waveform mode is an ideal mode in which the amplitude of the current waveform flowing through the first three-phase winding 151 and the current waveform flowing through the second three-phase winding 152 are equal.

  The second current waveform mode is a case where the current waveform shown in FIG. 3 flows in the first three-phase winding 151 and the current waveform shown in FIG. 5 flows in the second three-phase winding 152. The second current waveform mode is a mode in which the amplitude of the current waveform flowing through the second three-phase winding 152 is smaller than the amplitude of the current waveform flowing through the first three-phase winding 151.

  The third current waveform mode is a case where the current waveform shown in FIG. 3 flows in the first three-phase winding 151 and the current waveform shown in FIG. 6 flows in the second three-phase winding 152. The third current waveform mode is a mode in which current flows through the first three-phase winding 151 and no current flows through the second three-phase winding 152.

  Next, the magnetic attractive force generated in the teeth 13 of the rotating electrical machine 100 will be described with reference to FIG. FIG. 7 is a diagram showing the magnetic attractive force generated in the teeth 13 when the current waveform in the second current waveform mode is passed through the rotating electrical machine according to the first embodiment of the present invention. In FIG. 7, the arrow indicates the magnetic attractive force generated in the teeth, and the length of the arrow indicates the magnitude of the magnetic attractive force.

  First, when the current waveform in the second current waveform mode flows to the rotating electrical machine 100, a magnetic attractive force is generated at each tooth 13 of the rotating electrical machine 100 as indicated by an arrow in FIG. The concentrated winding coil 16 constituting the first three-phase winding 151 and the concentrated winding coil 16 constituting the second three-phase winding 152 are alternately arranged in the circumferential direction, and adjacent to the concentrated winding coil 16. Since the flowing current phases are different, the teeth 13 that generate a large magnetic attractive force and the teeth 13 that generate a small magnetic attractive force are evenly distributed in the circumferential direction of the stator 10. Therefore, the order of the ring vibration generated in the stator 10 due to the magnetic attractive force is increased, and the vibration is hardly generated. Furthermore, since the force due to the magnetic attractive force acts on the axis O of the rotor 1 evenly from the circumferential direction, the occurrence of eccentricity of the rotor 1 is suppressed and the generation of noise is suppressed.

  Further, since the concentrated winding coils 16 of the same phase of the same three-phase winding are mounted on the teeth 13 that are opposed to each other with the axis O of the rotor 1 interposed therebetween, the magnetic attraction force of the same magnitude is reversed. Occur. Therefore, the forces acting on the axis O of the rotor 1 due to the magnetic attractive force generated in the teeth 13 facing each other across the axis O of the rotor 1 cancel each other. Thereby, the rotor 1 is not decentered and the generation of noise is suppressed.

  In addition, when the current waveform in the third current waveform mode flows to the rotating electrical machine 100, the current does not flow to the second three-phase winding 152, so the concentrated winding coil 16 constituting the second three-phase winding 152 No magnetomotive force is generated in the wound teeth 13. However, since the magnetic flux passes through the teeth 13 around which the concentrated winding coil 16 constituting the second three-phase winding 152 is wound, a magnetic attraction force proportional to the square of the magnetic flux is applied to the second three-phase winding. It occurs in the tooth 13 around which the concentrated winding coil 16 constituting the wire 152 is wound. The magnetic attractive force generated in the tooth 13 around which the concentrated winding coil 16 constituting the second three-phase winding 152 is wound is wound by the concentrated winding coil 16 constituting the first three-phase winding 151. This is smaller than the magnetic attraction force generated in the tooth 13. Therefore, the teeth 13 that generate a large magnetic attraction force and the teeth 13 that generate a small magnetic attraction force are evenly distributed in the circumferential direction of the stator 10. Thereby, the order of the ring vibration generated in the stator 10 due to the magnetic attractive force is increased, and the vibration is less likely to occur. Furthermore, since the force due to the magnetic attractive force acts on the axis O of the rotor 1 evenly from the circumferential direction, the occurrence of eccentricity of the rotor 1 is suppressed and the generation of noise is suppressed. Further, since the magnetic attractive force of the same magnitude is generated in the opposite direction on the teeth 13 opposed across the axis O of the rotor 1, the rotor 1 is not decentered and the generation of noise is suppressed.

  When the current waveform in the first current waveform mode flows through the rotating electrical machine 100, the amplitude of the current waveform flowing through the first three-phase winding 151 and the current waveform flowing through the second three-phase winding 152 are equal. Even in the first current waveform mode, the teeth 13 that generate a large magnetic attractive force and the teeth 13 that generate a small magnetic attractive force are evenly distributed in the circumferential direction of the stator 10. As a result, the order of the ring vibration generated in the stator 10 is increased, and vibration is less likely to occur. Furthermore, since the force due to the magnetic attractive force acts on the axis O of the rotor 1 evenly from the circumferential direction, the occurrence of eccentricity of the rotor 1 is suppressed and the generation of noise is suppressed. Further, since the magnetic attractive force of the same magnitude is generated in the opposite direction on the teeth 13 opposed across the axis O of the rotor 1, the rotor 1 is not decentered and the generation of noise is suppressed.

  Next, a case where the current waveform in the second current waveform mode flows through the rotating electric machine 200 according to Patent Document 1 will be described. FIG. 8 is a diagram showing the magnetic attractive force generated in the teeth when the current waveform in the second current waveform mode is passed through the first conventional rotating electrical machine. In FIG. 8, the rotating electrical machine 200 includes a rotor 1 and a stator 201. The stator 201 includes a stator core 11 and a stator winding 202 composed of a concentrated winding coil 16 produced by winding a conductor wire around each tooth 13 a plurality of times. The concentrated winding coils 16 are arranged in the circumferential order of the teeth 13 in the U11 phase, U12 phase, V11 phase, V12 phase, W11 phase, W12 phase, U21 phase, U22 phase, V21 phase, V22 phase, W21 phase, W22 phase. A first three-phase winding is constituted by concentrated winding coils of U11 phase, U12 phase, V11 phase, V12 phase, W11 phase and W12 phase, and U21 phase, U22 phase, V21 phase, V22 phase, W21 phase and The second three-phase winding is constituted by the W22 phase concentrated winding coil. The rotating electrical machine 200 corresponds to the rotating electrical machine disclosed in Patent Document 1.

  When the current waveform in the second current waveform mode flows through the rotating electrical machine 200, a magnetic attractive force is generated at each tooth 13 of the rotating electrical machine 200 at time t0 as indicated by an arrow in FIG. As described above, in the rotating electrical machine 200, the concentrated winding coils 16 of the same phase of the same set of three-phase windings are arranged in the stator core 11 adjacent to each other in the circumferential direction. The order of the ring vibration generated in the stator 10 is lowered. Therefore, low-order ring vibration is likely to occur in the stator 201, and vibration and noise increase.

  Further, the teeth 13 around which the concentrated winding coil 16 through which a large current flows are concentrated in a half region in the circumferential direction of the stator core 11. Therefore, the magnetomotive force in the teeth 13 in the half region in the circumferential direction of the stator core 11 becomes larger than the magnetomotive force in the teeth 13 in the other half region in the circumferential direction of the stator core 11, and the magnetism generated in the teeth 13. A bias in the circumferential direction of the stator 201 occurs in the suction force. Therefore, a large force F that is biased to a half region in the circumferential direction of the stator 201 acts on the rotor 1, so that the rotor 1 is eccentric, and vibration and noise are generated in the rotating electrical machine 200.

  Further, since the concentrated coils 16 of the same phase with different three-phase windings are mounted on the teeth 13 that are opposed to each other with the axis O of the rotor 1 interposed therebetween, magnetic attraction forces of different magnitudes are reversed. Occur. Therefore, since the force due to the magnetic attractive force generated in the teeth 13 facing each other across the axis O of the rotor 1 acts on the axis O of the rotor 1, the rotor 1 is eccentric and noise is generated. To do.

  Further, when the current waveform in the third current waveform mode flows to the rotating electrical machine 200, the current does not flow to the second three-phase winding, so the concentrated winding coil 16 of the second three-phase winding is mounted. A magnetic attraction force due to the passage of magnetic flux is generated in the teeth 13 that are provided. The magnetic attraction force generated in the tooth 13 to which the concentrated winding coil 16 of the second three-phase winding is attached is the second three in the case where the current waveform in the second current waveform mode flows to the rotary electric machine 200. This is smaller than the magnetic attractive force generated in the teeth 13 to which the concentrated winding coils 16 of the phase winding are attached. Therefore, a large magnetic attractive force concentrates on the teeth 13 in the half region in the circumferential direction of the stator core 11. As a result, the force F biased to the half region in the circumferential direction of the stator 201 is further increased as compared with the second current waveform mode, causing the rotor 1 to be decentered and generating large vibrations and noises. . Further, the force acting on the axis O of the rotor 1 due to the magnetic attraction force generated on the teeth 13 facing each other across the axis O of the rotor 1 increases, causing the rotor 1 to be eccentric and causing large vibrations. And noise.

  When the current waveform in the first current waveform mode flows to the rotary electric machine 200, the current waveform flowing in the first three-phase winding and the current waveform flowing in the second three-phase winding have the same amplitude. . Therefore, since the magnetic attraction force of the same magnitude is generated in the opposite direction on the teeth 13 that are opposed to each other across the axis O of the rotor 1, the rotor 1 is not decentered, and the generation of noise is suppressed.

  Next, a case where the current waveform in the second current waveform mode flows to the rotating electrical machine 300 according to Patent Document 2 will be described. FIG. 9 is a diagram showing the magnetic attractive force generated in the teeth when the current waveform in the second current waveform mode is passed through the second conventional rotating electrical machine. In FIG. 9, the rotating electrical machine 300 includes a rotor 301 and a stator 310. The rotor 301 includes a rotor core 303 fixed to a rotation shaft 302 inserted at an axial center position, and four magnet housing holes 304 housed in magnet housing holes 304 penetrating the outer periphery of the rotor core 303 in the axial direction. And a magnet 305. The stator 310 includes a stator core 311 in which six teeth 313 project radially inward from the inner circumferential surface of the yoke 312 configured in an annular shape and are arranged at equiangular pitches in the circumferential direction. , And a stator winding 315 composed of a concentrated winding coil 16 produced by winding a conductor wire around each tooth 313 a plurality of times. The concentrated winding coil 16 has a U1 phase, a W2 phase, a V1 phase, a U2 phase, a W1 phase, and a V2 phase in the order of arrangement in the circumferential direction. The concentrated winding coils of the U1, V1, and W1 phases are used for the first three-phase winding. A second three-phase winding is constituted by concentrated winding coils of U2, V2, and W2 phases. This rotating electric machine 300 corresponds to the rotating electric machine according to Patent Document 2.

  When the current waveform in the second current waveform mode flows to the rotating electrical machine 300, a magnetic attractive force is generated at each tooth 313 of the rotating electrical machine 300 at time t0, as indicated by an arrow in FIG. In the rotary electric machine 300, the concentrated winding coil 16 constituting the first three-phase winding and the concentrated winding coil 16 constituting the second three-phase winding are alternately arranged in the circumferential direction, and adjacent concentrated windings are arranged. Since the phase of the current flowing through the coil 16 is different, the teeth 313 that generate a large magnetic attractive force and the teeth 313 that generate a small magnetic attractive force are evenly distributed in the circumferential direction of the stator 310. Therefore, the order of the ring vibration generated in the stator 310 due to the magnetic attractive force is increased, and the vibration is hardly generated. Furthermore, since the force due to the magnetic attractive force acts on the axis O of the rotor 301 evenly from the circumferential direction, the occurrence of eccentricity of the rotor 301 is suppressed.

  However, since the concentrated winding coils 16 of the same phase with different three-phase windings are mounted on the teeth 313 facing each other across the axis O of the rotor 301, magnetic attracting forces of different magnitudes are reversed. Occur. Therefore, since the force F caused by the magnetic attraction force acts on the rotor 301 in a biased manner, the rotor 1 is eccentric, and vibration and noise are generated in the rotating electrical machine 300.

  In addition, when the current waveform in the third current waveform mode flows to the rotating electrical machine 300, the current does not flow to the second three-phase winding, so the concentrated winding coil 16 of the second three-phase winding is attached. In the teeth 313, a magnetic attractive force resulting from the passage of magnetic flux is generated. The magnetic attraction force generated in the teeth 313 to which the concentrated winding coil 16 of the second three-phase winding is attached is the second three in the case where the current waveform in the second current waveform mode flows to the rotary electric machine 300. It becomes smaller than the magnetic attractive force generated in the teeth 313 to which the concentrated winding coil 16 of the phase winding is attached. Therefore, a large magnetic attractive force is concentrated on the teeth 313 around which the first three-phase winding is wound. As a result, the force F acting on the rotor 301 is further increased as compared with the second current waveform mode, causing the rotor 1 to be decentered, generating large vibrations and noise.

  When the current waveform in the first current waveform mode flows to the rotating electrical machine 300, the current waveform flowing in the first three-phase winding and the current waveform flowing in the second three-phase winding have the same amplitude. . Therefore, since the same magnetic attraction force is generated in the opposite direction to the teeth 313 across the axis O of the rotor 301, the teeth 313 are generated across the teeth O across the axis O of the rotor 3011. The forces acting on the axis O of the rotor 1 due to the magnetic attraction force cancel each other out, the rotor 301 is not decentered, and the generation of noise is suppressed.

As described above, according to the first embodiment, even if a difference occurs in the amplitude of the alternating current supplied to the first and second three-phase windings 151 and 152, the vibration is smaller than that in Patent Documents 1 and 2. In addition, generation of noise can be suppressed.
Further, since the first and second three-phase windings 151 and 152 are configured by star connection of three-phase windings, a circulating current is generated in the first and second three-phase windings 151 and 152. do not do. Therefore, no braking force is generated due to the circulating current, and the performance of the rotating electrical machine 100 can be improved.

Embodiment 2. FIG.
FIG. 10 is an electric circuit diagram in the rotary electric machine according to Embodiment 2 of the present invention.

  In FIG. 10, the stator winding 15 </ b> A includes a first three-phase winding 153 and a second three-phase winding 154. The concentrated winding coil 16 is arranged in the circumferential order of the teeth 13 in the U11 phase, V21 phase, W11 phase, U21 phase, V11 phase, W21 phase, U12 phase, V22 phase, W12 phase, U22 phase, V12 phase, W22 phase. And The U11 phase and U12 phase concentrated winding coils 16 are connected in series to form a U1 phase coil, the V11 phase and V12 phase concentrated winding coils 16 are connected in series to form a V1 phase coil, and the W11 phase and W12 phase The concentrated winding coil 16 is connected in series to form a W1-phase coil. Then, the first three-phase winding 153 is configured by delta connection of the U1-phase coil, the V1-phase coil, and the W1-phase coil.

The U21 phase and U22 phase concentrated winding coils 16 are connected in series to form a U2 phase coil, the V21 phase and V22 phase concentrated winding coils 16 are connected in series to form a V2 phase coil, and W21 and W22 phase concentrated windings. The coil 16 is connected in series to form a W2-phase coil. Then, the U3-phase coil, the V2-phase coil, and the W2-phase coil are delta-connected to form a second three-phase winding 154.
The rotating electrical machine 101 configured in this manner is configured in the same manner as the rotating electrical machine 100 according to the first embodiment, except that the stator winding 15A is used.

Therefore, the second embodiment also has the same effect as the first embodiment.
According to the second embodiment, since the first and second three-phase windings 153 and 154 are configured by delta connection of three-phase windings, when three-phase windings are star-connected. Necessary neutral point connection is not required. Therefore, the conductor wire for connecting the neutral points is not necessary, and the number of parts can be reduced, so that the increase in the size of the rotating electrical machine 101 can be suppressed and the cost can be reduced.

In each of the above embodiments, the rotary electric machine is described with 8 poles and 12 slots. However, the number of poles is not limited to this, and the rotation of 8n poles and 12n slots (where n is a natural number of 1 or more) is possible. What is necessary is just an electric machine.
In each of the above embodiments, each phase coil is configured by connecting in-phase concentrated winding coils in series, but each phase coil is configured by connecting in-phase concentrated winding coils in parallel. Also good. In this case, since the number of turns of the phase coil does not depend on the number of slots in the stator core, the degree of freedom in configuration is increased. Further, since the wire diameter of the concentrated winding coil can be reduced, the winding process is facilitated.

Claims (3)

A rotor having 8n magnetic poles (n is an integer of 1 or more);
An annular yoke, and 12n teeth each projecting radially inward from the inner circumferential surface of the annular yoke and arranged at an equiangular pitch in the circumferential direction, between the rotor and the rotor Securing a certain gap to the stator core disposed coaxially on the outer periphery of the rotor,
A first three-phase winding configured by AC connection of half of the concentrated winding coils mounted on each of the teeth, and a concentrated winding coil remaining on the concentrated winding coil are AC connected. A stator winding with a second three-phase winding being applied;
A first three-phase AC circuit that feeds power to the first three-phase winding;
A second three-phase AC circuit that feeds power to the second three-phase winding,
The concentrated winding coil constituting the first three-phase winding and the concentrated winding coil constituting the second three-phase winding are mounted on the teeth and alternately arranged in the circumferential direction,
The phase of the concentrated winding coil mounted on the teeth adjacent in the circumferential direction is different.
A rotating electrical machine in which the phases of the concentrated winding coils mounted on the teeth facing each other across the axis of the stator core are the same.   2. The rotating electrical machine according to claim 1, wherein each of the first three-phase winding and the second three-phase winding is configured by star connection of the concentrated winding coil.   2. The rotating electrical machine according to claim 1, wherein each of the first three-phase winding and the second three-phase winding is configured by delta connection of the concentrated winding coil.

Images