JPWO2021090387A1 - Rotor and rotating machine - Google Patents

Abstract

The purpose is to reduce the torque pulsation at the time of starting due to the field magnetic flux. It was generated by a rotor core (7) having a plurality of salient poles (71) protruding outward in the radial direction, and a plurality of inductive coils (72) and inductive coils provided in the plurality of salient poles to generate induced voltages. A plurality of field coils (73) that generate a field magnetic flux with an induced voltage, a rectifying circuit (8) in which the induction coil is connected in parallel to the field coil via a rectifying element (78), and rotation. It is provided with a plurality of conductor bars (75) that penetrate the child core in the axial direction and two short-circuit rings (76) that are provided at both ends of the rotor core in the axial direction and short-circuit the plurality of conductor bars. There is.

Description

The present application relates to a rotor and a rotary electric machine.

Induction motors that are directly driven by a commercial AC power source are generally used in cooling water circulation pumps in factories, cooling fans for air conditioning equipment, and the like. Due to the growing awareness of energy conservation in recent years, induction motors are also required to be more efficient. As an induction motor in which the reactive power is reduced and the power factor is improved, an induction motor in which a conductor bar is provided on the outer peripheral portion of a rotor in which a permanent magnet is embedded is disclosed (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2001-218399

The conventional induction motor has a feature that the starting torque is small and it is easy to start because the conductor bar is provided on the outer peripheral portion of the rotor in which the permanent magnet is embedded. However, the conventional induction motor has a problem that the torque at the time of starting pulsates due to the field magnetic flux due to the permanent magnet.

The present application has been made to solve the above-mentioned problems, and an object thereof is to reduce torque pulsation at the time of starting.

The rotor of the rotary electric machine of the present application includes a rotor core made of a magnetic material and having a plurality of salient poles protruding outward in the radial direction, a plurality of induction coils provided in each of the plurality of salient poles to generate an induced voltage, and a plurality of induction coils. Axial of multiple field coils that generate field magnetic flux with the induced voltage generated by the induction coil, a rectifying circuit in which the induction coil is connected in parallel to the field coil via a rectifying element, and a rotor core. It is provided with a plurality of conductor bars penetrating the rotor core and two short-circuit rings provided at both ends in the axial direction of the rotor core to short-circuit the plurality of conductor bars.

In the rotor of the rotary electric machine of the present application, a rectifying circuit in which an induction coil is connected in parallel to a field coil via a rectifying element, a plurality of conductor bars penetrating the rotor core in the axial direction, and a rotor. Since it is provided at both ends in the axial direction of the core and is provided with two short-circuit rings for short-circuiting a plurality of conductor bars, it is possible to reduce torque pulsation at the time of starting.

It is sectional drawing of the rotary electric machine which concerns on Embodiment 1. FIG. It is a vertical sectional view of the rotary electric machine which concerns on Embodiment 1. FIG. It is a circuit diagram of the rectifier circuit of the rotary electric machine which concerns on Embodiment 1. FIG. FIG. 3 is an induced voltage waveform diagram of the rotary electric machine according to the first embodiment. It is a circuit diagram of the rectifier circuit of the rotary electric machine of the comparative example which concerns on Embodiment 1. FIG. It is a figure which showed the flow of the fundamental wave magnetic flux in the rotary electric machine which concerns on Embodiment 1. FIG. It is sectional drawing of the rotary electric machine of the comparative example which concerns on Embodiment 1. FIG. It is a figure which shows the torque waveform at the time of starting of the rotary electric machine of the comparative example which concerns on Embodiment 1. FIG. It is a figure which shows the torque waveform at the time of starting of the rotary electric machine which concerns on Embodiment 1. FIG. It is sectional drawing of the rotary electric machine which concerns on Embodiment 2. FIG. It is sectional drawing of the rotary electric machine which concerns on Embodiment 3. FIG. It is a figure which showed the fundamental wave magnetic flux of the rotary electric machine which concerns on Embodiment 3 and the current flowing through a conductor bar. It is a figure which showed the fundamental wave magnetic flux of the rotary electric machine which concerns on Embodiment 3 and the current flowing through a conductor bar. It is a figure which showed the fundamental wave magnetic flux of the rotary electric machine which concerns on Embodiment 3 and the current flowing through a conductor bar. It is a figure which shows the connection relationship of the conductor bar of the rotary electric machine which concerns on Embodiment 4. FIG. It is sectional drawing of the rotary electric machine which concerns on Embodiment 5. It is sectional drawing of the rotary electric machine which concerns on Embodiment 6. It is a circuit diagram of the rectifier circuit of the rotary electric machine which concerns on Embodiment 6.

Hereinafter, the rotary electric machine according to the embodiment for carrying out the present application will be described in detail with reference to the drawings. In each figure, the same reference numerals indicate the same or corresponding parts.

Embodiment 1.
FIG. 1 is a cross-sectional view of the rotary electric machine according to the first embodiment. FIG. 1 is a radial cross-sectional view of a rotary electric machine. The rotary electric machine 1 of the present embodiment is composed of a stator 2 and a rotor 3. The stator 2 has a cylindrical shape surrounding the rotor 3 and is arranged with respect to the rotor 3 via a gap in the radial direction. The rotor 3 is rotatably supported with respect to the stator 2.

The stator 2 is composed of a stator coil 4 and a stator core 5 formed by laminating electromagnetic steel sheets. The stator core 5 has a tubular core back 51 and a plurality of teeth 52 protruding inward in the radial direction from the inner peripheral side of the core back 51. A stator slot 53, which is a space released inward in the radial direction of the stator core 5, is formed between the plurality of teeth 52 of the stator core 5. The stator coil 4 is wound around the teeth 52 using the space of the stator slot 53. The stator coil 4 is wound around, for example, each of the plurality of teeth 52 in a concentrated winding manner.

The rotor 3 is composed of a shaft 6 and a rotor core 7. The rotor core 7 is configured by laminating electromagnetic steel sheets. The rotor core 7 is fixed to the shaft 6 by shrink fitting or press fitting. The rotor core 7 has a plurality of salient poles 71 protruding outward in the radial direction. An induction coil 72 for obtaining an induced voltage and a field coil 73 for energizing a field current obtained by rectifying the induced voltage are wound around each salient pole 71. The radial end of the salient pole 71 has a shape that extends in the circumferential direction. A plurality of rotor slots 74 are provided at the radial ends of the salient poles 71, and conductor bars 75 are inserted into the plurality of rotor slots 74, respectively.

As shown in FIG. 1, in the rotary electric machine 1 of the present embodiment, the number of stator slots 53 is 6, the number of rotor slots 74 of the rotor 3 is 20, and the number of poles of the rotor 3 is a protrusion. The number of poles 71 is 4, but it is not limited to this. The material of the conductor bar 75 is preferably a metal such as aluminum or copper.

FIG. 2 is a vertical sectional view of a rotary electric machine according to the present embodiment. FIG. 2 is a sectional view taken along the axis of the rotary electric machine. Short-circuit rings 76 for electrically connecting a plurality of conductor bars 75 are provided at both ends of the rotor core 7 in the axial direction, respectively. The short circuit ring 76 may be integrally configured with the conductor bar 75. Further, connection plates 77 are provided at both ends of the induction coil 72 and the field coil 73 in the axial direction. The connection plate 77 is provided with a rectifying element for rectifying the electromotive force of the induction coil 72. A rectifier circuit is composed of the rectifier element, the induction coil 72, and the field coil 73.

FIG. 3 is a circuit diagram of a rectifier circuit of a rotary electric machine according to the present embodiment. The rectifier circuit 8 of the present embodiment is composed of an induction coil 72, a field coil 73, and a rectifier element 78. As shown in FIG. 3, the induction coil 72 is divided into a first induction coil 72a and a second induction coil 72b in which two induction coils wound around teeth at positions facing each other in the radial direction are connected in series, respectively. There is. In the field coil 73, four field coils are connected in series. The first induction coil 72a and the second induction coil 72b are connected in parallel to the field coil 73 via the rectifying element 78.

A field magnetic flux is obtained by energizing the field coil 73 after the voltages induced by the first induction coil 72a and the second induction coil 72b are rectified by the rectifying element 78. Since the fundamental wave magnetic flux synchronizes with the rotor 3 after the synchronous pull-in, it does not contribute to the induced voltage of the first induction coil 72a and the second induction coil 72b. The voltages induced in the first induction coil 72a and the second induction coil 72b are generated by spatial harmonics that are not synchronized with the rotor 3 after synchronous pull-in. In the rotary electric machine 1 of the present embodiment, the number of salient poles 71 of the rotor 3 is 4, and the number of stator slots 53 is 6, so that the fundamental wave component of the spatial secondary component is generated and at the same time the spatial secondary component is generated. Harmonics are also generated. Since this spatial fourth-order harmonic is not synchronized with the rotor after synchronous pull-in, an induced voltage is generated in the first induction coil 72a and the second induction coil 72b. When this induced voltage is rectified and energized in the field coil 73, a field magnetic flux is generated. With this field magnetic flux, the field torque after synchronous pull-in can be obtained.

The spatial harmonics that are the source of the field magnetic flux after synchronous pull-in travel in the opposite direction to the fundamental wave. Therefore, the frequency of the spatial harmonics in the rotor coordinates increases toward synchronization, and the induced voltage that can be obtained also increases. For example, when starting a rotary electric machine having 4 rotor salient poles and 6 stator slots with AC power of 50 Hz, the frequency in the rotor coordinates of the spatial second-order harmonics that is the source of the field magnetic flux. Is 50 Hz at the start, but the frequency when synchronized with the rotor is 150 Hz, and a field magnetic flux three times larger than that at the start is generated.

FIG. 4 is an induced voltage waveform diagram of the induction coil in the present embodiment. In FIG. 4, the solid line 41 is the voltage induced in the first induction coil 72a, and the broken line 42 is the voltage induced in the second induction coil 72b. The phase of the voltage induced in the first induction coil 72a and the phase of the voltage induced in the second induction coil 72b are 180 degrees out of phase. Therefore, the induced voltage generated in the induction coil 72 is full-wave rectified.

FIG. 5 is a rectifier circuit in a rotary electric machine of a comparative example in which an induction coil 72, a rectifier element 78, and a field coil 73 are connected in series. In the rotary electric machine of this comparative example, the induced voltage generated by the induction coil 72 is half-wave rectified. Since the field current obtained by applying the half-wave rectified induced voltage to the field coil 73 has a large pulsation, the pulsation of the torque also becomes large and it becomes difficult to start. The same applies to this comparative example even in a configuration in which one coil in which the induction coil and the field coil are integrated has the functions of both. In the rotary electric machine of the present embodiment, the first induction coil 72a and the second induction coil 72b are connected in parallel to the field coil 73 via the rectifying element 78. Therefore, since the induced voltage of the induction coil 72 is full-wave rectified, the pulsation of the field current can be reduced and the torque pulsation at the time of starting can be suppressed.

FIG. 6 is a diagram showing the flow of the fundamental wave magnetic flux in the rotary electric machine of the present embodiment. In FIG. 6, the solid arrow indicates the flow of the fundamental wave magnetic flux at the time of starting. As described above, the fundamental wave magnetic flux does not contribute to the induced voltage generated in the induction coil because it synchronizes with the rotor after the synchronous pull-in. However, since the fundamental wave magnetic flux is not synchronized with the rotor at the start, an induced voltage is generated. Therefore, when the fundamental wave magnetic flux is interlinked with the induction coil, the induced voltage due to the fundamental wave magnetic flux is rectified and flows to the field coil to generate a field magnetic flux, and torque pulsation is generated due to this field magnetic flux to start. Becomes difficult. In the present embodiment, since the conductor bar is arranged on the outer diameter side of the induction coil, an eddy current is generated in the conductor bar by interlinking the fundamental wave magnetic flux with the conductor bar. Since a demagnetic field that cancels the fundamental wave magnetic flux is generated due to the eddy current generated in this conductor bar, the fundamental wave magnetic flux does not interlink with the induction coil. As a result, the induced voltage due to the fundamental wave magnetic flux generated in the induction coil is suppressed, so that the torque pulsation at the time of starting is suppressed.

FIG. 7 is a cross-sectional view of a rotary electric machine of another comparative example according to the present embodiment. In the rotary electric machine shown in FIG. 7, the structure of the stator 2 is the same as that of the rotary electric machine shown in FIG. The rotor 3 is composed of a shaft 6 and a rotor core 7. The rotor core 7 has a columnar shape, and a plurality of rotor slots 74 are provided side by side in the circumferential direction at the radial end portion. A conductor bar 75 is inserted into each of the plurality of rotor slots 74. Further, four permanent magnets 79 are inserted in the rotor core 7 in the axial direction. The four permanent magnets 79 are evenly arranged in the circumferential direction, and the number of poles of the rotor is four.

FIG. 8 is a diagram showing a torque waveform at the start of the rotary electric machine of the comparative example shown in FIG. 7. The induced torque 11 obtained from the conductor bar is shown by a broken line, the total torque 12 of the induced torque and the field torque is shown by a solid line, and the load torque 13 is shown by a dotted line. Since the rotor is stopped at the time of starting, torque pulsation due to the field torque of one cycle is generated while the electric angle advances by one cycle. When the total torque 12 exceeds the load torque 13, it is possible to start from the stopped state. However, as shown in FIG. 8, the rotor is decelerated and the torque pulsation becomes large in the time zone 14 when the total torque 12 is lower than the load torque 13. Further, depending on the magnitude of the field torque and the load torque, it is not possible to accelerate from the stopped state, which makes starting difficult. In the rotary electric machine of the comparative example in which a permanent magnet is used as the field magnetic flux shown in FIG. 7, if a permanent magnet having a large magnetic force is used in order to obtain efficiency after synchronous pull-in, the torque pulsation due to the field torque becomes larger and the start is started. May not be possible.

FIG. 9 is a diagram showing a torque waveform at the time of starting the rotary electric machine of the present embodiment. Similarly to FIG. 8, the induced torque 11 obtained from the conductor bar is shown by a broken line, the total torque 12 of the induced torque and the field torque is shown by a solid line, and the load torque 13 is shown by a dotted line. As described above, the induced voltage generated in the induction coil by the spatial harmonics is small at the start and increases toward synchronization. Therefore, in the rotary electric machine of the present embodiment, the field torque generated at the time of starting is also small, and the time zone 14 in which the total torque is lower than the load torque is shorter than in the case of the comparative example. As a result, the rotary electric machine of the present embodiment suppresses torque pulsation and facilitates starting as compared with the rotary electric machine of the comparative example in which the field magnetic flux is obtained by a permanent magnet.

The rotary electric machine of the present embodiment includes a rotor core made of a magnetic material and having a plurality of salient poles protruding outward in the radial direction, and a plurality of induction coils provided for each of the plurality of salient poles to generate an induced voltage. Axial of a plurality of field coils that generate field magnetic flux by the induced voltage generated by the induction coil, a rectifying circuit in which the induction coil is connected in parallel to the field coil via a rectifying element, and a rotor core. It is equipped with a plurality of conductor bars penetrating the magnet and two short-circuit rings provided at both ends of the rotor core in the axial direction to short-circuit the plurality of conductor bars, thereby reducing torque pulsation at the time of starting. Can be done.

Embodiment 2.
FIG. 10 is a cross-sectional view of the rotary electric machine according to the second embodiment. FIG. 10 is a sectional view in the radial direction of the rotary electric machine. The rotary electric machine 1 of the present embodiment has the same configuration as the rotary electric machine of the first embodiment, but the positions of the rotor slot 74 and the conductor bar 75 are different. The rotor slot 74 and the conductor bar 75 of the rotary electric machine of the first embodiment are arranged on the outer diameter side of the induction coil 72, but the rotor slot 74 and the conductor bar 75 of the rotary electric machine of the present embodiment are arranged. Is arranged on the inner diameter side of the induction coil 72. Further, in FIG. 10, the solid line arrow indicates the flow of spatial harmonics after synchronous pull-in. Although not shown, the short-circuit ring is also arranged on the inner diameter side.

As described in the first embodiment, the induced voltage is generated by interlinking the induction coil with the spatial harmonics that are not synchronized with the rotor after the synchronous pull-in, and the field magnetic flux is obtained. At this time, eddy currents are generated in the conductor bar by interlinking the spatial harmonics with the conductor bar. Since a demagnetic field that cancels the space harmonics is generated by this eddy current, the space harmonics interlinking the induction coil are reduced and the field magnetic flux is reduced. In the rotary electric machine of the present embodiment, since the conductor bar is arranged on the inner diameter side of the induction coil, the space harmonics penetrate into the rotor core without being canceled by the eddy current flowing through the conductor bar. Efficiently interlinks with the induction coil. Therefore, a large field torque can be obtained, and the efficiency after synchronous pull-in is improved. Even in the rotary electric machine of the present embodiment, the effect of the fundamental wave magnetic flux interlinking with the conductor bar is smaller than that of the rotary electric machine of the first embodiment, but the effect of reducing the field magnetic flux at the start is the same. , The effect of suppressing torque pulsation at the time of starting can be obtained.

Embodiment 3.
FIG. 11 is a cross-sectional view of the rotary electric machine according to the third embodiment. FIG. 11 is a sectional view in the radial direction of the rotary electric machine. In the rotary electric machine 1 of the present embodiment, in addition to the same configuration as the rotary electric machine of the first embodiment, auxiliary poles 80 are provided between the four radial ends of the four salient poles 71, respectively. .. The auxiliary pole 80 is configured by laminating electromagnetic steel sheets. A plurality of rotor slots 74a are provided in the auxiliary pole 80, and conductor bars 75a are inserted into the plurality of rotor slots 74a, respectively. The conductor bar 75a provided on the auxiliary pole 80 is electrically connected to the conductor bar 75 provided on the salient pole 71 by a short-circuit ring.
The rotary electric machine configured in this way can further reduce the torque pulsation at the time of starting due to the field magnetic flux. The reason will be explained below.

FIG. 12 is a diagram showing a fundamental wave magnetic flux and a current flowing through a conductor bar at a certain time of a rotating electric machine having no auxiliary pole. Further, FIG. 13 is a diagram showing the fundamental wave magnetic flux and the current flowing through the conductor bar at different times from those of FIG. 12 of the rotary electric machine having no auxiliary pole. Further, FIG. 14 is a diagram showing the fundamental wave magnetic flux and the current flowing through the conductor bar at the same time as FIG. 13 of the rotary electric machine provided with the auxiliary pole. The number of salient poles of the rotor is 4, the number of stator slots of the stator is 6, and the fundamental wave magnetic flux is assumed to travel in the counterclockwise direction. In FIGS. 12, 13 and 14, the solid line arrow indicates the flow of the fundamental wave magnetic flux at that time, and the broken line arrow indicates the flow of the fundamental wave magnetic flux at the time before the electric angle 1/4 cycle from that time. There is.

As shown in the conductor bar of FIG. 12, when shifting from the flow of the fundamental wave magnetic flux indicated by the broken line arrow before the electric angle 1/4 period to the flow of the fundamental wave magnetic flux indicated by the solid line arrow at the current time, the conductor bar An eddy current flows in the flow so as to maintain the flow of the fundamental wave magnetic flux indicated by the broken line arrow. Torque is generated in the counterclockwise direction by this eddy current and the fundamental wave magnetic flux indicated by the solid arrow. FIG. 13 shows the flow of the fundamental wave magnetic flux at a time different from the time shown in FIG. In FIG. 13, when shifting from the flow of the fundamental wave magnetic flux indicated by the broken arrow arrow 1/4 period before the electric angle to the flow of the fundamental wave magnetic flux indicated by the solid line arrow at the current time, the fundamental wave magnetic flux indicated by the solid line arrow There is no conductor bar in the flow path of. Therefore, the conductor bar does not generate an eddy current that maintains the flow of the fundamental wave magnetic flux indicated by the broken line arrow. As a result, at the time shown in FIG. 13, no torque is generated in the counterclockwise direction due to the eddy current. That is, in a rotary electric machine having no auxiliary pole, torque is generated in the counterclockwise direction due to the eddy current flowing through the conductor bar of the salient pole and the fundamental wave magnetic flux at the time shown in FIG. 12, but at the time shown in FIG. No torque is generated because eddy current does not flow in the conductor bar of the salient pole. As a result, there is torque pulsation in the induced torque obtained by the conductor bar at the time of starting.

On the other hand, in the rotary electric machine of the present embodiment, as shown in FIG. 14, at the same time as the time shown in FIG. 13, the conductor bar of the auxiliary pole is provided in the path through which the fundamental wave magnetic flux indicated by the solid line arrow flows. exist. Therefore, an eddy current flows through the conductor bar of the auxiliary pole so as to maintain the flow of the fundamental wave magnetic flux indicated by the broken line arrow. As a result, torque is generated in the counterclockwise direction by this eddy current and the fundamental wave magnetic flux indicated by the solid arrow. That is, in a rotary electric machine equipped with a compensating pole, torque is generated in the counterclockwise direction due to the eddy current flowing through the conductor bar of the salient pole and the fundamental wave magnetic flux at the time shown in FIG. 12, and the compensating pole is generated at the time shown in FIG. Torque is generated in the counterclockwise direction by the eddy current flowing through the conductor bar of the pole and the magnetic flux of the fundamental wave. As a result, the torque pulsation at the time of starting can be further reduced.

Embodiment 4.
FIG. 15 is a diagram showing a connection relationship of conductor bars in the rotary electric machine according to the fourth embodiment. FIG. 15 shows only the rotor core 7 and the auxiliary pole 80. In the rotary electric machine shown in the third embodiment, all of the conductor bars 75a provided in the auxiliary pole 80 and all of the conductor bars 75 provided in the salient pole 71 are electrically connected by a short-circuit ring. In the rotary electric machine of the present embodiment, as shown in FIG. 15, one of the conductor bars 75 provided on the salient pole 71 and one of the conductor bars 75 provided on the other salient pole 71 are each formed by a short-circuit ring. It is connected, and one of the conductor bars 75a provided on the auxiliary pole 80 and one of the conductor bars 75a provided on the other auxiliary pole 80 are electrically connected by a short circuit ring, respectively.

If the conductor bar of the salient pole and the conductor bar of the auxiliary pole are short-circuited, an eddy current flows through the conductor bar of the salient pole and the conductor bar of the auxiliary pole so as to cancel the spatial harmonics. This eddy current reduces the spatial harmonics interlinking the induction coil and reduces the field torque after synchronous pull-in. As a result, the efficiency of the rotary electric machine decreases. In the rotary electric machine of the present embodiment, since the conductor bars of the salient poles and the conductor bars of the auxiliary poles are connected to each other, the conductor bars of the salient poles and the conductor bars of the auxiliary poles that cancel the spatial harmonics are connected to each other. There is no eddy current flowing in each. Therefore, since the spatial harmonics interlinking with the induction coil do not decrease, a large field torque can be obtained, and it is possible to prevent a decrease in the efficiency of the rotary electric machine after synchronous pull-in.

Of the upper and lower short-circuit rings, at least one of the short-circuit rings may be short-circuited between the conductor bars of the salient poles and the conductor bars of the auxiliary poles. The reason will be explained. For example, in the upper short-circuit ring, the conductor bars of the salient poles and the conductor bars of the auxiliary poles are connected to each other in the connection relationship shown in FIG. 15, and all the conductor bars are connected by the short-circuit ring on the lower side. It shall be. In this case, since the conductor bar of the salient pole and the conductor bar of the auxiliary pole are not short-circuited in the upper short-circuit ring, there is no current path that closes via the conductor bar of the salient pole and the conductor bar of the auxiliary pole. Therefore, since an eddy current that cancels the above-mentioned spatial harmonics is not generated, a large field torque can be obtained and it is possible to prevent a decrease in the efficiency of the rotary electric machine after synchronous pull-in.

Embodiment 5.
FIG. 16 is a cross-sectional view of the rotary electric machine according to the fifth embodiment. FIG. 16 is a sectional view in the radial direction of the rotary electric machine. In addition to the same configuration as the rotary electric machine of the third embodiment, the rotary electric machine 1 of the present embodiment has both side surfaces of the salient pole 71, the outer peripheral surface of the rotor core 7 between the salient poles 71, and the auxiliary pole 80. A groove 81 extending in the axial direction is provided on the inner peripheral surface. Further, the rotary electric machine 1 of the present embodiment includes a bridge member 82 inserted into the four grooves 81. The bridge member 82 fixes the rotor core 7, the induction coil 72, the field coil 73, and the auxiliary pole 80. The bridge member 82 is made of a non-magnetic material.

In the rotary electric machine configured in this way, the rotor core 7, the induction coil 72, the field coil 73, and the auxiliary pole 80 are fixed by the bridge member 82, so that the reliability of the rotor is improved. When the bridge member 82 is made of a magnetic material, the field magnetic flux generated at the salient pole is short-circuited via the bridge member and closed inside the rotor, so that the field torque is reduced. By using a non-magnetic member for the bridge member as in the present embodiment, it is possible to reduce the field magnetic flux short-circuited and suppress the decrease in the field torque.

Embodiment 6.
FIG. 17 is a cross-sectional view of the rotary electric machine according to the sixth embodiment. FIG. 17 is a sectional view taken along the radial direction of the rotary electric machine. In the rotary electric machine 1 of the present embodiment, the induction coil 72 and the field coil 73 wound around the four salient poles 71 are divided into four independent coils in the same configuration as the rotary electric machine of the first embodiment. There is. FIG. 18 is a circuit diagram of a rectifier circuit of a rotary electric machine according to the present embodiment. The induction coil 72 is divided into a first induction coil 72a, a second induction coil 72b, a third induction coil 72c, and a fourth induction coil 72d. Further, the field coil 73 is divided into a first field coil 73a, a second field coil 73b, a third field coil 73c, and a fourth field coil 73d. In FIG. 17, the first induction coil 72a is indicated by A, the second induction coil 72b is indicated by B, the third induction coil 72c is indicated by C, and the fourth induction coil 72d is indicated by D. Similarly, in FIG. 17, the first field coil 73a is shown by E, the second field coil 73b is shown by F, the third field coil 73c is shown by G, and the fourth field coil 73d is shown by H.

As shown in FIG. 18, the rotary electric machine of the present embodiment is provided with two rectifier circuits 8 independently. One rectifying circuit 8 is composed of two rectifying elements 78, a first induction coil 72a, a second induction coil 72b, a first field coil 73a, and a second field coil 73b. The other one rectifying circuit 8 is composed of two rectifying elements 78, a third induction coil 72c, a fourth induction coil 72d, a third field coil 73c, and a fourth field coil 73d. The first induction coil 72a and the second induction coil 72b are connected in parallel to the first field coil 73a and the second field coil 73b via the rectifying element 78. The third induction coil 72c and the fourth induction coil 72d are connected in parallel to the third field coil 73c and the fourth field coil 73d via the rectifying element 78.

In the rotary electric machine having such a configuration, the time constant of the rectifier circuit is reduced by reducing the inductance of the rectifier circuit as compared with the rotary electric machine of the first embodiment composed of one rectifier circuit. When the time constant of the rotor rectifying circuit is large, the pulsation of the field current after synchronous pull-in becomes large, and the pulsation of the field torque is generated due to the pulsation of the field current. The pulsation of the field torque also causes a pulsation in the rotation speed, so that the pulsation of the field current becomes even larger. As a result, when the time constant of the rectifier circuit on the rotor side is large, the pulsation of the rotation speed increases due to the positive feedback. By configuring the rectifier circuit with two independent rectifier circuits as in the rotary electric machine of the present embodiment, it is possible to suppress the inductance and reduce the time constant as compared with the case where the rectifier circuit is composed of one. As a result, the pulsation of the rotation speed after the synchronous pull-in can be reduced.

Although the present application describes various exemplary embodiments, the various features, embodiments, and functions described in one or more embodiments are limited to the application of the particular embodiment. Rather, it can be applied to embodiments alone or in various combinations.
Therefore, innumerable variations not exemplified are envisioned within the scope of the techniques disclosed in the present application. For example, it is assumed that at least one component is modified, added or omitted, and further, at least one component is extracted and combined with the components of other embodiments.

1 rotor machine, 2 stator, 3 rotor, 4 stator coil, 5 stator core, 6 shaft, 7 rotor core, 8 rectifier circuit, 11 induction torque, 12 total torque, 13 load torque, 51 core back, 52 Teeth, 53 Stator slot, 71 salient pole, 72 lead coil, 73 field coil, 74, 74a rotor slot, 75, 75a conductor bar, 76 short circuit ring, 77 connection plate, 78 rectifying element, 79 permanent magnet, 80 auxiliary pole, 81 groove, 82 bridge member.

The rotor of the rotary electric machine of the present application includes a rotor core made of a magnetic material and having a plurality of salient poles protruding outward in the radial direction, and a plurality of induction coils provided in the plurality of salient poles to generate an induced voltage. Axial of multiple field coils that generate field magnetic flux with the induced voltage generated by the inductive coil, a rectifying circuit in which the inductive coil is connected in parallel to the field coil via a rectifying element, and a rotor core. a plurality of auxiliary made of a magnetic material between the circumferential direction and a plurality of first conductor bars penetrating, and the two short-circuit ring provided at both ends in the axial direction of the rotor core, a plurality of salient poles A rotor provided with poles, the first conductor bar is provided at a salient pole on the outer diameter side of the induction coil, and the plurality of compensating poles include a plurality of compensating poles penetrating in the axial direction. A second conductor bar is provided, one of the first conductor bars provided at the salient pole and one of the first conductor bars provided at the other salient pole is short-circuited at least one of the two short-circuit rings. It is short-circuited by the ring, and one of the second conductor bars provided in the auxiliary pole and one of the second conductor bars provided in the other auxiliary pole are short-circuited by one short-circuit ring .

In the rotor of the rotary electric machine of the present application, a rectifying circuit in which an induction coil is connected in parallel to a field coil via a rectifying element, a plurality of first conductor bars penetrating the rotor core in the axial direction, and a plurality of first conductor bars. A short-circuit ring provided at both ends in the axial direction of the rotor core and a plurality of auxiliary poles composed of a magnetic material between the circumferential directions of the plurality of salient poles are provided. A plurality of second conductor bars are provided on the salient pole on the outer diameter side of the induction coil, and a plurality of second conductor bars penetrating the compensating pole in the axial direction are provided on the plurality of auxiliary poles. One of the one conductor bars and one of the first conductor bars provided at the other salient poles are short-circuited by at least one of the two short circuit rings, and the second conductor bar provided at the auxiliary pole. Since one of the two conductor bars and one of the second conductor bars provided in the other auxiliary pole are short-circuited by one of the short-circuit rings, the torque pulsation at the time of starting can be reduced.

Claims (10)

A rotor core made of magnetic material and having multiple salient poles protruding outward in the radial direction,
A plurality of induction coils provided in the plurality of salient poles to generate an induced voltage, and a plurality of field coils in which a field magnetic flux is generated by the induced voltage generated by the induction coil.
A rectifying circuit in which the induction coil is connected in parallel to the field coil via a rectifying element,
A plurality of conductor bars penetrating the rotor core in the axial direction,
The rotor is provided at both ends in the axial direction of the rotor core, and is provided with two short-circuit rings for short-circuiting the plurality of conductor bars. The rotor according to claim 1, wherein the conductor bar is provided at the salient pole on the outer diameter side of the induction coil. The rotor according to claim 1, wherein the conductor bar is provided on the inner diameter side of the induction coil. Further provided with a plurality of complementary poles composed of a magnetic material between the circumferential directions of the plurality of salient poles.
The rotor according to claim 2, wherein the plurality of auxiliary poles are provided with a plurality of conductor bars penetrating the auxiliary pole in the axial direction. One of the conductor bars provided at the salient pole and one of the conductor bars provided at the other salient pole are short-circuited by at least one of the two short-circuit rings, and the auxiliary pole is short-circuited. The rotor according to claim 4, wherein one of the provided conductor bars and one of the other conductor bars provided in the auxiliary pole are short-circuited by the one short-circuit ring. The rotor according to claim 4 or 5, further comprising a non-magnetic bridge member for fixing the plurality of auxiliary poles to the rotor core. The rotor according to any one of claims 1 to 6, wherein the rectifier circuit is composed of a plurality of independent rectifier circuits. The rotor according to any one of claims 1 to 7.
A rotary electric machine made of a magnetic material and provided with a stator arranged on the radial outer side of the rotor via a gap. The stator is wound around a tubular core back and a stator core having a plurality of teeth protruding radially inward from the inner peripheral side of the core back, and a centralized winding around each of the plurality of teeth. The rotary electric machine according to claim 8, further comprising a stator coil. The rotary electric machine according to claim 9, wherein the number of the salient poles of the rotor is 4, and the number of the teeth of the stator is 6.

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