JP7271076B1 - Rotating electric machine - Google Patents

Abstract

An object of the present invention is to suppress vibration of a rotating shaft. A generator (1) includes a sub-exciter rotor (34) fixed to a rotating shaft (14) and a sub-exciter stator (32) arranged on the outer peripheral side of the sub-exciter rotor (34) inside a generator frame (4). An AC exciter stator 20 arranged on the outer peripheral side of the sub-exciter 28 and an AC exciter rotor 22 arranged on the outer peripheral side of the AC exciter stator 20 are provided. [Selection drawing] Fig. 1

Description

The present invention relates to a rotating electrical machine, and is suitable for application to, for example, a brushless rotating electrical machine having an AC exciter and a sub-exciter.

Conventionally, a brushless rotating electric machine having a stator and a rotor is widely known. In such a brushless rotating electric machine, the stator is composed of a stator core and stator windings housed in slots on the inner peripheral side of the stator core. There is one that is provided on the inner peripheral side of the child and is composed of a rotor core and permanent magnets provided on the outer peripheral side of the rotor core (see, for example, Patent Document 1). In such a brushless rotating electric machine, a rotating magnetic field formed by permanent magnets interlinks with the stator windings, causing electromagnetic induction to generate a voltage in the stator windings. Supply alternating current to the regulator. An automatic voltage regulator converts this alternating current to direct current.

Such a brushless rotating electric machine is, for example, like the generator 401 shown in FIG. There is one in which the exciter rotor 434 is provided coaxially. The generator 401 is attached to the end of the rotating shaft 414 so that the joint shaft 56 protrudes (overhangs) toward the outside of the bearing 416 with respect to the inside of the generator frame 404 . A sub-exciter rotor 434 is attached to the . AC exciter stator 420 is fixed to, for example, bearing bracket 406 or generator frame 404 . The sub-exciter stator 432 is fixed to a retaining ring 442 provided outside the bearing 416 with respect to the inside of the generator frame 404 .

Japanese Patent No. 3305002

In such a rotary electric machine, the length of the rotating shaft 414 in the axial direction becomes long and vibrates. There is a problem that the child 434 vibrates.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above points, and intends to propose a rotating electrical machine capable of suppressing vibration of a rotating shaft.

In order to solve such a problem, in the rotating electric machine of the present invention, a brushless rotating electric machine provided with an AC exciter and a sub-exciter for an excitation power supply includes a sub-exciter fixed to a rotating shaft inside the generator frame. A sub-exciter rotor provided with magnetic poles composed of a rotor core and permanent magnets provided on the outer peripheral side of the sub-exciter rotor core, and the outer periphery of the sub-exciter rotor inside the generator frame On the side, a sub-exciter stator core formed by laminating magnetic steel plates in the axial direction and a sub-exciter stator winding housed in slots provided in the sub-exciter stator core An exciter stator, an AC exciter stator core formed by laminating magnetic steel sheets in the axial direction on the outer peripheral side of the sub-exciter inside the generator frame, and slots provided in the AC exciter stator core An AC exciter stator composed of an AC exciter stator winding housed in a generator frame, and magnetic steel plates are laminated in the axial direction on the outer peripheral side of the AC exciter stator inside the generator frame. An AC exciter rotor composed of an AC exciter rotor core and AC exciter rotor windings housed in slots provided in the AC exciter rotor core is provided.

The present invention can shorten the axial length of the rotating shaft and eliminate the member protruding from the end of the rotating shaft.

Advantageous Effects of Invention According to the present invention, a rotating electric machine that can suppress vibration of a rotating shaft can be realized.

1 is an axial cross-sectional view showing the configuration of a generator according to a first embodiment; FIG. FIG. 5 is an axial cross-sectional view showing the configuration of a generator according to a second embodiment; FIG. 11 is an axial cross-sectional view showing the configuration of a generator according to a third embodiment; FIG. 11 is an axial cross-sectional view showing the configuration of a generator according to a fourth embodiment; FIG. 11 is a cross-sectional view showing the configuration of a sub-exciter AC exciter stator core according to a fourth embodiment; FIG. 3 is an axial cross-sectional view showing the configuration of a conventional power generator;

EMBODIMENT OF THE INVENTION Hereinafter, the form (henceforth an embodiment) for implementing this invention is demonstrated using drawing.

[1. First Embodiment]
[1-1. Configuration of generator]
As shown in FIG. 1, the generator 1 is a brushless rotary electric machine, and mainly includes a generator frame 4, a main machine stator 10, a main machine rotor 12, a rotating shaft 14, a bearing 16, and a bearing bracket. 6 , a rotary rectifier 40 , a retaining ring 42 , an AC exciter 18 and a sub-exciter 28 . A motor (not shown) is connected to the left end of the rotating shaft 14 in FIG. The prime mover is an engine, a turbine, a water wheel, or the like, and generates power by applying rotational force to the generator 1 to rotate each mechanism in the generator 1 .

Hereinafter, the direction along which the rotating shaft 14 extends is defined as an axial direction Da, and the direction in which the main machine rotor 12, the AC exciter rotor 22, and the subexciter rotor 34 rotate is defined as a circumferential direction. Further, with respect to the axial direction Da, the side closer to the prime mover is also called the drive source closer side, and the side farther from the prime mover is also called the drive source distant side. Further, the direction toward the rotation shaft center Ra of the rotation shaft 14 when viewed in the axial direction Da is defined as the inner peripheral direction, and the direction away from the rotation shaft center Ra of the rotation shaft 14 when viewed in the axial direction Da is defined as the outer periphery. called direction. Further, the direction orthogonal to the axial direction Da and along the inner peripheral direction and the outer peripheral direction is also called a radial direction Dd. Further, with respect to the radial direction Dd, the side of the rotating shaft 14 that is close to the center Ra of the rotating shaft is also called the inner side or the inner peripheral side, and the side that is separated from the center Ra of the rotating shaft 14 is also called the outer side or the outer peripheral side.

The rotary shaft 14 has a substantially columnar shape and extends along an axial direction Da along a substantially horizontal direction, and the end portion on the side closer to the drive source is connected to the prime mover. The rotating shaft 14 rotates in the circumferential direction about the rotating shaft center Ra, which is the center, by the prime mover. The bearing 16 is, for example, a sliding bearing, and supports the rotating shaft 14 rotatably. The bearing 16 is supported by a bearing bracket 6 that is supported at the end of the generator frame 4 on the drive source remote side. The generator frame 4 has an internal space, and accommodates a portion of the rotating shaft 14, the bearing 16, the main machine stator 10, the main machine rotor 12, the AC exciter 18, and the sub-exciter 28 inside. and supports the bearing bracket 6.

The bearing bracket 6 as a whole has a so-called bowl shape in which the centers of the ends on the drive source close side and the drive source remote side are open. The bearing bracket 6 is composed of a support portion 6B and a mounting portion 6S, and a substantially cylindrical internal space surrounded by the support portion 6B and the mounting portion 6S is formed. That is, the bearing bracket 6 has a substantially solid cylindrical inner side that is recessed in a cylindrical shape from the drive source close side toward the drive source remote side, and the center of the drive source remote side end is open. ing. The support portion 6B has a substantially disk shape, and the outer peripheral portion is fixed and supported by the generator frame 4, and the central portion has a circular opening and supports the bearing 16 on the inner peripheral side thereof. The attachment portion 6S extends from the support portion 6B toward the drive source proximity side and has a cylindrical shape.

The main machine stator 10 is fixed to the inner peripheral side of the generator frame 4, and includes a main machine stator core 10a in which annular electromagnetic steel plates are laminated in the axial direction Da, and a slot on the inner peripheral side of the main machine stator core 10a. It is composed of the main machine stator winding 10b housed inside. The main machine rotor 12 is a salient pole type magnetic pole provided on the inner peripheral side of the annular main machine stator 10, and is fixed to the rotating shaft 14 by fitting or the like. Magnetic steel sheets are laminated in the axial direction Da. It is composed of a main machine rotor core 12a and main machine rotor windings 12b wound around the main machine rotor core 12a.

The rotary rectifier 40 is fixed to the rotating shaft 14 on the drive source remote side of the main machine rotor 12, converts the alternating current flowing in the AC exciter rotor winding 22b into a direct current, and converts the main machine rotor winding. 12b.

The sub-exciter 28 is composed of a sub-exciter stator 32 and a sub-exciter rotor 34. Inside the generator frame 4, the rotary rectifier 40 and the bearing 16 are arranged on the drive source remote side of the rotary rectifier 40. is set between. The sub-exciter stator 32 is fixed to the inner peripheral side of the mounting portion 6S of the bearing bracket 6, and includes a sub-exciter stator core 32a in which annular electromagnetic steel plates are laminated in the axial direction Da, and a sub-exciter stator core 32a. A secondary exciter stator winding 32b accommodated in a slot on the inner peripheral side of the child iron core 32a. The sub-exciter rotor 34 is provided on the inner peripheral side of the annular sub-exciter stator 32 and is fixed to the rotating shaft 14 by fitting or the like. It is composed of a permanent magnet 34b provided on the outer peripheral side of the daughter core 34a. The sub-exciter rotor core 34a is formed by stacking annular electromagnetic steel plates in the axial direction Da. The permanent magnet 34b is attracted to the outer peripheral surface of the sub-exciter rotor core 34a, and an adhesive is applied between the permanent magnet 34b and the outer peripheral surface of the sub-exciter rotor core 34a, thereby allowing the sub-exciter rotor to rotate. The adsorption position is prevented from shifting with respect to the daughter core 34a.

The retaining ring 42 is fixed to the rotating shaft 14 between the rotary rectifier 40 and the sub-exciter 28, and as a whole is a hollow body with a closed end on the drive source close side and an open end on the drive source distant side. , which is a so-called bowl shape. The retaining ring 42 is composed of a fixing portion 42B and a mounting portion 42S, and a cylindrical internal space surrounded by the fixing portion 42B and the mounting portion 42S is formed. That is, the retainer ring 42 has a shape in which the inside of a solid cylindrical shape is recessed in a cylindrical shape from the drive source remote side toward the drive source proximity side. The fixed portion 42B has a substantially disk shape and is fixed to the rotating shaft 14 at its center. The mounting portion 42S extends from the outer peripheral portion of the fixed portion 42B toward the drive source remote side, and has a cylindrical shape.

The AC exciter 18 is composed of an AC exciter stator 20 and an AC exciter rotor 22, and the rotary rectifier 40 and the bearing 16 on the drive source remote side of the rotary rectifier 40 inside the generator frame 4. It is provided on the outer peripheral side of the sub-exciter 28 between . The AC exciter stator 20 is fixed to the outer peripheral side of the mounting portion 6S of the bearing bracket 6, and includes an AC exciter stator iron core 20a in which annular electromagnetic steel plates are laminated in the axial direction Da, and an AC exciter stator core 20a. AC exciter stator windings 20b housed in slots on the outer peripheral side of iron core 20a. The AC exciter rotor 22 is provided on the outer peripheral side of the annular AC exciter stator 20, and is fixed to the mounting portion 42S of the retaining ring 42. The AC excitation rotor 22 is formed by laminating annular electromagnetic steel plates in the axial direction Da. It is composed of a machine rotor core 22a and AC exciter rotor windings 22b housed in slots on the inner peripheral side of the AC exciter rotor core 22a.

[1-2. Conversion from rotational force to electric power]
In such a configuration, the process of converting rotational force into electric power will be described. First, a prime mover (not shown) is used to rotate the rotary shaft 14 . At this time, the sub-exciter rotor 34 provided on the rotating shaft 14 also rotates. Since the sub-exciter rotor 34 is provided with a permanent magnet 34b, a rotating magnetic field is formed. When this rotating magnetic field interlinks with the sub-exciter stator winding 32b, electromagnetic induction occurs, a voltage is generated in the sub-exciter stator winding 32b, and an alternating current is supplied to the outside of the generator 1.

This AC current is converted into a DC current by an automatic voltage regulator (not shown) built in an external control panel and supplied to the AC exciter stator winding 20b. A magnetic field is formed according to Ampere's law when a DC current flows through the AC exciter stator winding 20b. When this magnetic field interlinks with the AC exciter rotor winding 22b, electromagnetic induction occurs, voltage is generated in the AC exciter rotor winding 22b, and AC current flows.

This alternating current is converted into a direct current by a rotary rectifier 40 provided on the rotary shaft 14 and supplied to the main machine rotor winding 12b. A magnetic field is formed according to Ampere's law when a direct current flows through the main machine rotor winding 12b. When this magnetic field interlinks with the main machine stator winding 10b, electromagnetic induction occurs, voltage is generated in the main machine stator winding 10b, and alternating current is supplied to the external load.

[1-3. effects, etc.]
In the above configuration, the generator 1 has the sub-exciter 28 and the AC exciter 18 arranged inside the generator frame 4 . In the generator 1, the sub-exciter rotor 34 is fixed to the rotating shaft 14, and the sub-exciter stator 32 is fixed to the inner peripheral side of the support portion 6B of the bearing bracket 6 on the outer peripheral side of the sub-exciter rotor 34. fixed to That is, in the generator 1, the sub-exciter 28 is of the inner rotor type. Further, in the generator 1, the AC exciter stator 20 is fixed to the outer peripheral side of the support portion 6B of the bearing bracket 6 on the outer peripheral side of the sub-exciter 28, and the AC exciting The machine rotor 22 is fixed to the mounting portion 42S of the retaining ring 42. - 特許庁That is, in the generator 1, the AC exciter 18 is of the outer rotor type. Further, in the generator 1, the AC exciter stator core 20a and the sub-exciter stator core 32a are integrated via the support portion 6B of the bearing bracket 6. As shown in FIG.

Therefore, compared to the generator 401 (FIG. 6), the generator 1 can shorten the length of the rotating shaft 14 in the axial direction Da. . In addition, like the generator 401 (FIG. 6), the generator 1 has a joint shaft 56 protruding from the end of the rotating shaft 14 on the drive source remote side further to the drive source remote side, and the joint shaft 56 is connected to the auxiliary exciter. Compared to the case where the rotor 434 is provided, it is possible to eliminate the overhang portion, which is a member that protrudes from the end of the rotating shaft 14 on the drive source separation side, further toward the drive source separation side, thereby suppressing vibration. Furthermore, since the generator 1 can omit the joint shaft 56 compared to the generator 401, it is possible to reduce the number of components and improve the manufacturability.

By the way, as a rotating electric machine of a comparative example, the sub-exciter 28 and the AC exciter 18 are arranged inside the generator frame 4, the AC exciter rotor 22 is fixed to the rotating shaft 14, and the AC exciter rotor 22 is The AC exciter stator 20 is fixed to the inner peripheral side of the support portion 6B of the bearing bracket 6 on the outer peripheral side of the AC exciter stator 20, and the sub-exciter stator 32 is fixed to the bearing bracket 6 on the outer peripheral side of the AC exciter stator 20. It is conceivable to fix the sub-exciter rotor 34 to the retaining ring 42 on the outer peripheral side of the sub-exciter stator 32 while fixing it to the outer peripheral side of the support portion 6B.

Here, although the AC exciter 18 generally has a larger capacity than the sub-exciter 28, in order to obtain a large capacity, it is necessary to increase the number of iron cores and copper wires that constitute the AC exciter 18. A space is required in one or both of the direction Da and the radial direction Dd.

In the case of the rotating electric machine of the comparative example, since the AC exciter with a large capacity is arranged on the inner peripheral side of the sub-exciter, in order to secure the space necessary for securing the capacity of the AC exciter, the axial direction It is necessary to lengthen the AC exciter to Da. In this case, the length of the rotating shaft in the axial direction Da becomes long, and the length of the entire rotary electric machine in the axial direction Da also becomes long.

On the other hand, in the generator 1, on the inner peripheral side of the generator frame 4, the AC exciter 18 with a large capacity is arranged on the outer peripheral side, and the sub-exciter 28 with a small capacity is arranged on the inner peripheral side. Therefore, the generator 1 can secure the space required for securing the capacity of the AC exciter 18 in the radial direction Dd. Thereby, the generator 1 can shorten the length of the axial direction Da of a rotating shaft compared with the generator of a comparative example, and can shorten the length of the axial direction Da of the generator 1 whole.

According to the above configuration, the generator 1 is a brushless rotary electric machine including the AC exciter 18 and the sub-exciter 28 for excitation power supply. A sub-exciter rotor 34 having magnetic poles composed of an exciter rotor core 34a and permanent magnets 34b provided on the outer peripheral side of the sub-exciter rotor core 34a, and inside the generator frame 4, On the outer peripheral side of the sub-exciter rotor 34, a sub-exciter stator core 32a formed by laminating magnetic steel plates in the axial direction Da and a sub-exciter housed in a slot provided in the sub-exciter stator core 32a. A sub-exciter stator 32 composed of a motor stator winding 32b, and an AC exciter formed by laminating magnetic steel plates in the axial direction Da on the outer peripheral side of the sub-exciter 28 inside the generator frame 4 An AC exciter stator 20 composed of a stator core 20a and an AC exciter stator winding 20b housed in a slot provided in the AC exciter stator core 20a, and inside the generator frame 4, On the outer peripheral side of the AC exciter stator 20, an AC exciter rotor core 22a formed by laminating magnetic steel sheets in the axial direction Da, and an AC excitation motor housed in slots provided in the AC exciter rotor core 22a. An AC exciter rotor 22 composed of a machine rotor winding 22b is provided.

Therefore, in the generator 1, the length of the rotating shaft 14 in the axial direction Da can be shortened, and a member protruding from the end of the rotating shaft 14 on the drive source separation side further to the drive source separation side can be eliminated.

[2. Second Embodiment]
[2-1. Configuration of generator]
As shown in FIG. 2, in which members corresponding to those in FIG. Although different in having a rotating rectifier 140 instead, a retaining ring 142 replacing the retaining ring 42, and a rotating shaft 114 replacing the rotating shaft 14, other points are configured in the same manner.

The rotary rectifier 140 differs from the rotary rectifier 40 in that it is fixed to the holding ring 142 instead of the rotary shaft 14, but is otherwise configured in the same manner. The rotating shaft 114 is formed shorter than the rotating shaft 14 .

Thus, in the generator 101 , the rotary rectifier 140 is made to rotate together with the rotating shaft 114 by integrating the rotary rectifier 140 with the retaining ring 142 . Therefore, compared to the generator 1, the generator 101 can omit the space for fixing the rotary rectifier 40 on the rotating shaft 14 (FIG. 1), so that the length of the rotating shaft 14 in the axial direction Da can be further shortened. As a result, the power generator 101 can be made smaller and lighter than the power generator 1, and the vibration of the rotary shaft 14 can be suppressed.

In other points as well, the generator 101 according to the second embodiment can achieve the same effects as the generator 1 according to the first embodiment.

[3. Third Embodiment]
[3-1. Configuration of generator]
As shown in FIG. 3, in which members corresponding to those in FIG. Although it differs in that it has a holding ring 242 that replaces it and a bearing bracket 206 that replaces the bearing bracket 6, other points are configured in the same way.

The holding ring 242 is different from the holding ring 42 in that the ventilation holes 44 are formed, but is otherwise configured in the same manner. A plurality of ventilation holes 44 as first ventilation holes 44, for example eight, are provided at equal intervals along the circumferential direction in the fixing portion 42B. The ventilation hole 44 has a cylindrical shape extending in the axial direction Da and has a circular cross section. Also, the ventilation hole 44 penetrates from the drive source remote side to the drive source close side surface of the fixed portion 42B, and communicates the inner space of the holding ring 242 with the outside of the holding ring 242 on the drive source close side. ing.

Although the bearing bracket 206 is different from the bearing bracket 6 in that the ventilation holes 46 are formed, the other points are the same. A plurality of ventilation holes 46 as second ventilation holes 46, for example eight, are provided at equal intervals along the circumferential direction in the support portion 6B. The ventilation hole 46 has a cylindrical shape extending in the axial direction Da and has a circular cross section. The ventilation hole 46 penetrates from the driving source close side to the driving source distant side surface of the support portion 6B, and communicates the inner space of the bearing bracket 206 with the outside of the bearing bracket 206 on the driving source distant side. ing.

For this reason, the generator 201 draws air into the inner space of the bearing bracket 206 through the ventilation hole 46 from the outside on the drive source remote side of the generator frame 4 , and the sub-exciter stator 32 and the sub-exciter rotor 34 It can be discharged through the ventilation hole 44 to the outside on the side closer to the engine than the retaining ring 242 . Further, the generator 201 takes in air from the outer peripheral side of the retaining ring 242 , passes the air between the AC exciter stator 20 and the AC exciter rotor 22 , and passes through the ventilation holes 44 to bring the air closer to the motor than the retaining ring 242 . It can be discharged to the outside of the side. Therefore, compared with the generator 1, the generator 201 can effectively cool the sub-exciter 28 and the AC exciter 18 and improve the cooling performance.

In other respects, the power generator 201 according to the third embodiment can have the same effects as the power generator 1 according to the first embodiment.

[4. Fourth Embodiment]
[4-1. Configuration of generator]
As shown in FIGS. 4 and 5, in which members corresponding to those in FIG. Although the sub-exciter stator core 32a and the sub-exciter AC exciter stator core 48 replacing the AC exciter stator core 20a are different, other points are the same. The sub-exciter AC exciter stator core 48 is formed by stacking annular magnetic steel plates in the axial direction Da. A sub-exciter stator slot 50 in which the sub-exciter stator winding 32b is accommodated is formed along the inner circumference of the sub-exciter AC exciter stator core 48 over the entire circumference. In addition, an AC exciter stator slot 52 in which the AC exciter stator winding 20b is accommodated is formed along the entire circumference of the sub-exciter AC exciter stator iron core 48 on the outer peripheral side thereof.

Further, as shown in FIG. 5, the sub-exciter AC exciter stator core 48 is provided with four mounting holes 54 at equal intervals along the circumferential direction. The mounting hole 54 has a shape along the circumferential direction, and penetrates from the drive source remote side to the drive source proximity side of the sub-exciter AC exciter stator core 48 . The auxiliary exciter AC exciter stator core 48 is fixed to the bearing bracket 6 by inserting the mounting portion 6S of the bearing bracket 6 into the mounting hole 54 .

In this way, in the generator 301, the sub-exciter stator core 32a and the AC exciter stator core 20a are made of the same punched material, and integrated with the sub-exciter AC exciter stator core 48. Therefore, the generator 301 can reduce the number of components compared to the case where the sub-exciter stator core 32a and the AC exciter stator core 20a are separately formed.

In the generator 301, when the sub-exciter stator core 32a and the AC exciter stator core 20a are separately formed, the sub-exciter stator slot is formed in the electromagnetic steel plate that becomes the sub-exciter stator core 32a. 50 is compared with the case where the AC exciter stator slots 52 are machined in the electromagnetic steel sheet that will become the AC exciter stator core 20a. The sub-exciter stator slots 50 and the AC exciter stator slots 52 can be processed in the magnetic steel sheet, which can improve productivity.

Further, in the generator 301, when the sub-exciter stator core 32a and the AC exciter stator core 20a are separately formed, the electromagnetic steel sheets that become the sub-exciter stator core 32a are laminated to form the AC exciter. Compared to the case where the magnetic steel sheets that form the stator core 20a are laminated, the magnetic steel sheets that form the sub-exciter AC exciter stator core 48 can be laminated in one assembly process, improving manufacturability. can be made

In other respects, the generator 301 according to the fourth embodiment can have the same effects as the generator 1 according to the first embodiment.

[5. Other embodiments]
In the above-described third embodiment, the case where both the ventilation holes 44 and 46 are formed has been described. The present invention is not limited to this, and at least one of the ventilation holes 44 and 46 may be formed.

Furthermore, in the first embodiment described above, the case where the present invention is applied to the generator 1 has been described. The present invention is not limited to this, and may be applied to various other rotating electric machines. The same applies to the second to fourth embodiments.

Furthermore, the present invention is not limited to the embodiments described above and other embodiments. That is, the scope of the present invention also extends to embodiments obtained by arbitrarily combining part or all of each of the above-described embodiments with other embodiments described above. Further, the present invention extracts a part of the configuration described in any of the above-described embodiments and other embodiments described above, and The scope of the present invention also extends to the case of substituting or diverting a part of the configuration of any of the embodiments, or adding a part of the extracted configuration to any embodiment. be. For example, by combining the second embodiment and the third embodiment, the rotary rectifier 140 may be fixed to the retaining ring 142 and the ventilation holes 44 and 46 may be formed.

Furthermore, in the above-described first embodiment, the sub-exciter rotor 34 as the sub-exciter rotor, the sub-exciter stator 32 as the sub-exciter stator, and the AC The case where the generator 1 as a rotating electric machine is configured by the exciter stator 20 and the AC exciter rotor 22 as an AC exciter rotor has been described. The present invention is not limited to this, and a rotating electric machine may be configured by a sub-exciter rotor, a sub-exciter stator, an AC exciter stator, and an AC exciter rotor, which are configured in various other ways. good. The same applies to the second to fourth embodiments.

INDUSTRIAL APPLICABILITY The present invention can be used in a brushless rotating electric machine having an AC exciter and a sub-exciter.

1, 101, 201, 301, 401...... generator, 4, 404... generator frame, 6, 206, 406... bearing bracket, 6B... support part, 6S... mounting part, 10... main engine fixing Child 10a... main machine stator core 10b... main machine stator winding 12... main machine rotor 12a... main machine rotor core 12b... main machine rotor winding 14, 114, 414... Rotating shaft 16, 416 Bearing Ra... Center of rotating shaft 18 AC exciter 20, 420 AC exciter stator 20a AC exciter stator core 20b AC excitation Machine stator windings 22, 422 AC exciter rotor 22a AC exciter rotor core 22b AC exciter rotor winding 28 Sub-exciter 32, 432 sub-exciter stator, 32a... sub-exciter stator core, 32b... sub-exciter stator winding, 34, 434... sub-exciter rotor, 34a... sub-exciter rotor core, 34b, 434b... permanent magnet, 40, 140... rotary rectifier, 42, 142, 242, 442... retaining ring, 42B... fixed part, 42S... mounting part, 44, 46... ventilation hole, 48... secondary Exciter AC exciter stator core 50 Sub-exciter stator slot 52 AC exciter stator slot 54 Mounting hole 56 Joint shaft Da Axial direction Dd radial direction.

Claims (7)

In a brushless rotating electric machine equipped with an AC exciter and a sub-exciter for an excitation power supply,
A sub-exciter rotor provided with magnetic poles composed of a sub-exciter rotor core fixed to a rotating shaft and permanent magnets provided on the outer peripheral side of the sub-exciter rotor core inside the generator frame and,
Inside the generator frame, on the outer peripheral side of the sub-exciter rotor, a sub-exciter stator core formed by laminating magnetic steel sheets in the axial direction and a slot provided in the sub-exciter stator core are accommodated. a sub-exciter stator composed of a sub-exciter stator winding and a sub-exciter stator winding;
Inside the generator frame, on the outer peripheral side of the sub-exciter, an AC exciter stator core formed by laminating magnetic steel sheets in the axial direction and a slot provided in the AC exciter stator core an AC exciter stator composed of an AC exciter stator winding;
Inside the generator frame, on the outer peripheral side of the AC exciter stator, an AC exciter rotor core formed by laminating magnetic steel sheets in the axial direction and a slot provided in the AC exciter rotor core. and an alternating current exciter rotor composed of a coiled alternating current exciter rotor winding. Provided between the outer peripheral side of the sub-exciter stator and the inner peripheral side of the AC exciter stator, is supported by the generator frame, and supports the sub-exciter stator and the AC exciter stator. a bracket that
a holding ring formed at one end in the axial direction and having a fixed portion fixed to the rotating shaft at the other end in the axial direction to hold the rotor of the AC exciter; The rotary electric machine according to claim 1, characterized by: 3. The rotating electric machine according to claim 2, further comprising a rectifier fixed to said rotating shaft. 3. The rotating electric machine according to claim 2, further comprising a rectifier fixed to said retaining ring. The retaining ring is
3. The rotating electric machine according to claim 2, wherein the fixed portion has a first ventilation hole that communicates between the inner space of the retaining ring and the outside. The bracket is
The rotary electric machine according to claim 5, further comprising a second ventilation hole communicating between the inside and the outside of the generator frame on one end side in the axial direction of the AC exciter and the sub-exciter. The rotary electric machine according to claim 2, wherein the sub-exciter stator core and the AC exciter stator core are integrally formed.

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