JP2010098789A - Synchronous machine with brushless exciter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a synchronous machine with a brushless exciter that improves the cooling performance within the machine by securing an optimum airway for cooling air. <P>SOLUTION: The synchronous machine with the brushless exciter is provided, in which a rotating armature coil 7a in an AC exciter 7 and a rotating commutator A8 are installed on the rotating shaft 4 of the synchronous machine 1, which converts AC electromotive force generated in the rotating armature coil of the AC exciter into DC power by the rotating commutator, and which supplies a DC excited current to the field circuit 5b of the synchronous machine. The rotating commutator A8 is composed of module type commutators A8<SB>2U</SB>, A8<SB>2V</SB>and A8<SB>2</SB>, which are directly attached to the periphery of the rotating shaft 4 of the synchronous machine 1. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a synchronous machine provided with a brushless exciter, and more particularly, to a synchronous machine provided with a brushless exciter with an improved rotary rectifier.

  One of excitation methods for synchronous machines such as a synchronous motor and a synchronous generator is a brushless excitation system. In this brushless excitation method, an armature coil and a rotary rectifier wound around the rotary armature of the AC exciter are installed on the rotary shaft of the synchronous machine, and the AC electromotive force generated by the rotary armature coil of the AC exciter is This is an excitation method in which a DC excitation current is supplied to a field circuit of a synchronous machine by converting into DC power by a rotary rectifier.

Hereinafter, a synchronous machine including a conventional brushless excitation device will be described with reference to the drawings.
FIG. 7 is an upper half view of a synchronous machine equipped with a conventional brushless exciter.
In FIG. 7, reference numeral 1 denotes a synchronous machine (main machine) such as a synchronous motor or a synchronous generator, and an annular stator core 3a fixed to the stator frame 2 and a stator coil 3b wound around the stator core 3a. And a stator coil 3 fitted in and fixed to the rotary shaft 4 so as to be freely rotatable in the hole of the stator core 3a, and a salient-pole field core 5a and a field coil on the salient-pole field core 5a. It is comprised from the rotor 5 formed by winding 5b.

  Reference numeral 6 denotes a brushless exciter, which includes an AC exciter 7 including a rotary armature coil 7a installed on the rotor shaft 4 of the synchronous machine 1 and a field pole 7b fixed to the stator frame 2, and a rotor shaft. 4 is installed between the rotor 5 and the AC exciter 7 of the main machine, converts the AC electromotive force of the rotary armature coil 7a to DC and outputs it, and supplies the exciting current to the field coil 5b of the main machine 1 The rotary rectifier 8

  The synchronous machine 1 including the brushless exciter is further fitted to the bearing device 9 that rotatably supports the shaft end portion of the rotating shaft 4 on the AC exciter 7 side, and the other end portion of the rotating shaft 4. And a coupling flange 11 that also serves as a fan boss to which the centrifugal fan 10 is attached.

The rotary rectifier 8 described above is the same as that disclosed in Patent Document 1 and the like, but FIG. 8 is more detailed and will be described below with reference to FIG.
FIG. 8 is an enlarged perspective view of a conventional rotary rectifier 8, and FIG. 9 is a circuit diagram of the brushless excitation device 6.

8 and 9, 8 ₁ is a commutator cylinder which is fitted and fixed on the rotating shaft 4, the commutator cylinder _81, the three-phase alternating current phases on the outer circumference (U, V, W) of a rectifying element 8 _2U, 8 _2V and 8 _2W rectifier flange 8 ₃ of the fixing portion and also serves as a output short circuit discoid which is formed in a conductive are provided.

Moreover, the rectifier flange _{8 3,} in addition to the studs _{8 4U, 8 4V} and _{8 4W} in a position adjacent to each phase of the rectifying element _{8 2U, 8 2V} and _{8 2W,} attach the stud _{8 4K} and _{8 4J} . Stud _{8 4U, 8 4V} and _{8 4W} includes an AC phase of the rotary armature coil 7a of the exciter 7 (U, V, W) are connected to the terminals are lead line _{8 5U, 8 5V} and _{8 5W,} each phase rectifying element 8 _2U, 8 a stud for connecting the _2V and the anode side of the 8 _2W, so as not to conduct with rectifier flange ₈₁ are fastened by bolts via respective insulating bushing or the like. In addition, since the connection relation between the rectifying elements 8 _2U , 8 _2V and 8 _{2W of} each phase and the studs 8 _4U , 8 _4V and 8 _4W is clearly shown in the circuit diagram of FIG. 9, in order to avoid complication in FIG. The connection line is omitted.

On the other hand, the stud _84K is a connection line connected to the _lead wire _85O connected to the neutral point O of the rotary armature coil 7a of the AC exciter and the negative terminal K (-) of the field coil 5b of the main machine 1. 8 is intended to connect the _5K, the stud 8 _{5 J} is for connecting the connected lead wire 8 _{5 J} to the positive terminal J conductive rectifier flange ₈₁ and the field coil 5b (+).

The rotary armature coil 7a of the AC exciter 7 and the rectifier flange ₈₁ between the lead line _{8 5U,} 8 _{5V, 8 5W} and _{8. 5O,} rectifier flange _{8 1} lead line ₈ between the field coil 5b _{5 J} and 8 _5K is fixed to the rotary shaft 4 by glass tapes (or glass yarns) 12 and 13 impregnated with a thermosetting or room temperature curable resin, respectively.

The synchronous machine provided with the brushless exciter configured as described above is cooled by the rotation of the centrifugal fan 10 provided on the coupling flange 11 on the opposite side of the AC exciter 7 to the intake port on the AC exciter 7 side. The cooling air sucked from 14 flows through the stator frame 2 as indicated by an arrow and is discharged from the exhaust port 15.
JP 2003-37962 A

If conventional rotating rectifier installed synchronous machine as described above, to narrow the cooling air passage which disc-shaped rectifier flange 8 ₃ leads from the inlet port 14 is a kind of partition plate to the rotor 5 side, the rotor 5 Not only does the cooling performance of the salient-pole field core 5a and the field coil 5b decrease, the temperature rises, but also the cooling performance of the stator core 3a and the stator coil 3b of the stator 3 decreases, and the temperature rises. There was a possibility of causing.

  Therefore, in view of the above circumstances, the present invention eliminates the disc-shaped rectifier flange that narrows the cooling air passage, and instead secures a sufficient cooling air passage by attaching a module type rectifier to the rotating shaft. An object of the present invention is to provide a synchronous machine including a brushless excitation device that improves the cooling performance in the machine.

  In order to achieve the above object, the invention according to claim 1 is generated by a rotary armature coil of an AC exciter and a rotary rectifier installed on a rotary shaft of a synchronous machine, and generated by the rotary armature coil of the AC exciter. In a synchronous machine having a brushless exciter that converts AC electromotive force into DC power by the rotary rectifier and supplies a DC exciting current to the field circuit of the synchronous machine, a module configured by modularizing rectifying elements in units of each phase The rotary rectifier is configured by attaching a type rectifier to a rotary shaft between a rotary armature coil of the AC exciter and a field coil of the synchronous machine.

  According to a second aspect of the present invention, in the first aspect, the module type rectifier is directly attached on the rotating shaft of the synchronous machine.

  The invention according to claim 3 is the module according to claim 1 or 2, wherein the module type rectifier is a module formed by combining the positive-phase rectifying element and the negative-side rectifying element of the same phase in the bridge-type multiphase rectifier circuit. It is characterized by comprising one AC input terminal and positive and negative DC output terminals.

  According to a fourth aspect of the present invention, in the first or second aspect, the module type rectifier is connected to each phase of the rotary armature coil of the AC exciter to form a three-phase half-wave rectifier circuit. The device is a modularized device.

  The invention according to claim 5 is characterized in that, in claim 3 or 4, the module type rectifiers for each phase are juxtaposed at appropriate intervals in the circumferential direction of the rotating shaft.

  The invention according to claim 6 is the invention according to claim 3 or 4, wherein the module type rectifier for each phase is disposed at an appropriate interval in the axial direction of the rotating shaft and in a direction perpendicular to the axial direction. It is attached.

  The invention described in claim 7 is characterized in that, in claim 3 or 4, the same polarity terminals on the output side of each module type rectifier are connected by a short-circuit plate.

  The invention according to claim 8 is characterized in that, in claim 7, the short-circuit plate is constituted by a flat plate having a shape along the peripheral surface of the rotating shaft.

  According to a ninth aspect of the present invention, in the seventh aspect of the present invention, the short-circuit plate is formed in an annular shape and connected to the module type rectifier of each phase via an attachment leg.

  The invention according to claim 10 is the rotating shaft according to claim 3 or 4, wherein the module type rectifier for each phase is inclined with respect to the axial direction at an appropriate interval in the axial direction of the rotating shaft. It is characterized by being directly attached to.

  According to the present invention, it is possible to provide a rectifier structure for a rotating electrical machine that secures a sufficient cooling air passage by attaching a modular rectifier to a rotating shaft and improves the cooling performance in the machine.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, the same description is attached | subjected to the common part through each figure of drawing, and the overlapping description is abbreviate | omitted suitably.

(First embodiment)
FIG. 1 is a view showing a synchronous machine provided with a brushless exciter according to a first embodiment of the present invention. In particular, FIG. 1 (a) is an upper half view of the overall configuration of the synchronous machine provided with a brushless exciter, FIG. 1 (b) is an enlarged view of the rotary rectifier. FIGS. 2A and 2B are enlarged views showing the mounting state of the module type rectifiers constituting the rotary rectifier on the rotating shaft and the connection state between the module type rectifiers. FIG. 3 is a circuit diagram showing a connection state between the module type rectifiers.

In the present embodiment, the rotary rectifier 8 of the brushless exciter 6 is replaced with A8 as compared with the conventional example, and the other parts are the same, so the following description will focus on the rotary rectifier A8.
1 (a), 1 (b), 2 (a), 2 (b) and 3, the rotary rectifier A8 according to the present embodiment is spaced from the rotating shaft 4 in the circumferential direction as appropriate. three-phase alternating current phase (U, V, W) and juxtaposed modular rectifier _{A8 2U, A8 2V, A8 2W} corresponding to being directly attached. Incidentally, the peripheral surface of the rotary shaft 4 is appropriately chamfered modular rectifier _{A8 2U, A8 2V, A8 2W} to directly attached. Also, installation number of modules rectifier _{A8 2U,} A8 _2V, A8 _2W is intended determined according to the current capacity of the excitation circuit, two for each phase, there is a case of parallel connection as such 3, In the case of the present embodiment, one is installed in each phase.

By the way, the module type rectifiers A8 _2U , A8 _2V , and A8 _2W referred to here are “a positive-phase arm (rectifier element) of the same phase in a bridge-type three-phase rectifier circuit, as shown in the circuit diagram of FIG. The negative electrode side arm (rectifier element) is combined and modularized as one unit. For example, the module rectifier A8 _2U used for U-phase, the positive side arm (rectifying element) U1, disposed on the negative electrode side arm (rectifying element) U2 and straight, and so input and output terminals are arranged in a straight line And packaged in one. V-phase, W-phase using modular rectifier _A8 2V, _{A8 2W} Similarly for each positive side arm (rectifying element) V1 and the negative electrode side arm (rectifying element) V2, the positive electrode-side arm (rectifying element) W1 and the negative The arms (rectifying elements) W2 are linearly arranged and packaged in one so that the positional relationship of the input / output terminals is linearly arranged.

Thus configured modular rectifier _{A8 2U,} A8 2V and, _{A8 2W,} connection between the rotating armature coils 7a and the field coil 5b of the synchronous machine 1 of the AC exciter 7 is performed as follows. In other words, each phase output terminal U of the electric Isogo coil 7a of the AC exciter 7, V and W are connection lines ₈ 5U for each phase, _{respectively, 8 5V} and ₈ through _5W each phase module rectifier _{A8 2U,} A8 _{2V, A8 2W} positive side arm, which is the AC terminals of U1, V1, W1 and the negative side arm U2, V2, common connection point of the W2 _{C U,} connecting C V, the _{C W.}

Then, among the DC terminals of the module type rectifiers A8 _2U , A8 _2V , _A82W of each phase, the output terminals on the positive side are connected to each other by the short circuit plate A8 _6P , and the output terminals on the negative side are connected to the short circuit plate A8 _6N. Connect with each other. These short-circuit plates A8 _6P and A8 _6N are formed in a flat plate shape along the peripheral surface of the rotating shaft 4, and are made of a copper plate or an aluminum plate so that the centrifugal force acting on itself can be reduced. It is configured to be lighter than a normal cable in which a copper wire is covered with an insulator.

The positive side short-circuit plate A8 _6P is connected to the J (+) terminal of the field coil 5b through the connection line _85J , while the negative side short-circuit plate A8 _6N is connected to the _K of the field coil 5b through the connection line _85K. Connected to the (-) terminal.

After the electrical connection of the rotary rectifier A8 is thus performed, the connection lines A8 _5U , A8 _5V and A8 _5W are fastened on the rotary shaft 4 with the glass resin tape (or glass resin yarn) 12, and the connection lines A8 _5J and A8 are connected. _5K is fastened on the rotating shaft 4 with a glass resin tape (or glass resin yarn) 13, and the resin is cured and fixed. FIG. 1B shows this state.

The cooling of the synchronous machine 1 configured as described above was sucked from the intake port 14 on the AC exciter 7 side by the rotation of the centrifugal fan 10 attached to the rotary shaft 4 driven by the prime mover via the fan boss 11. The cooling air flows through the stator frame 2 as indicated by the arrows and is discharged radially from the exhaust port 15. In this embodiment, the disk-shaped rectifier flange is necessary in the prior art. 8 ₃ due to the modular rectifier _{A8 2U, A8 2V, A8 2W} to eliminate as directly fixed to the rotating shaft 4, the cooling air sucked from the intake port 14, synchronous without being inhibited ventilation passage It flows into the rotor 5 side of the machine 1. As a result, the iron cores and coils of the stator 3 and the rotor 5 are effectively cooled.

Above As mentioned, according to the first embodiment, it eliminates the rectifier flange 8 ₃ constituting part, a commutator cylinder ₈₁ and disc-shaped in the conventional apparatus, the positional relationship instead output terminals Since the module type rectifiers A8 _2U , A8 _2V , A8 _2W arranged in a straight line are configured to be directly attached to the rotary shaft 4, the height from the peripheral surface of the rotary shaft 4 to the module type rectifier is reduced. Thus, there is no part that narrows the cooling air passage like the conventional rotary rectifier 8, and the air passage that guides the cooling air to the rotor side can be formed. As a result, not only the field coil 5b but also the cooling performance of the stator windings and other in-machine components can be improved.

Also, located between the rotational armature coils 7a and synchronous machine 1 of the field coil 5b of the AC exciter 7 modules rectifier _{A8 2U, A8 2V, A8 2W} is the axial direction with respect to the surface of the rotary shaft 4 Since the module type rectifiers A8 _2U , _A82V , and _A82W are rotated together with the rotating shaft 4, the fan effect is added and the cooling effect on the field coil 5b can be increased.

Furthermore, according to the present embodiment, although the centrifugal force acting on the short-circuiting plate _A8 6P, _{A8 6N} by the rotation of the rotary shaft 4 is applied to the connecting portion, short-circuiting plate _A8 6P, _{A8 6N} is to cover the copper wire with an insulating material Therefore, the stress applied to the connecting portion can be reduced because it is configured to be lighter than connecting with a normal cable. In addition, the module type rectifiers A8 _2U , A8 _2V , and A8 _2W can be efficiently cooled by the fin effect of the short-circuit plates A8 _6P and A8 _6N .

(Second Embodiment)
Next, a second embodiment of the present invention will be described.
FIG. 4 is an enlarged perspective view of a rotary rectifier A8 according to the second embodiment of the present invention.
The difference between the present embodiment and the first embodiment is that the positive electrode side short-circuit plate A8 _6P and the negative electrode-side short circuit plate A8 _6N have a flat plate shape along the peripheral surface of the rotating shaft shown in FIGS. 1 (b) and 2 (b). To the annular shape shown in FIG.

Incidentally, the positive electrode side short circuit plate A8 _6P and the anode short-circuit plate A8 _6N This annular, so that there is no narrowing the conventional ventilation path of the cooling air as rectifier flange _81, substantially L next shaped attachment leg provided L on the inner peripheral side, it is devised for mounting the positive electrode side DC terminal of the module rectifier _{A8 2U, A8 2V, A8 2W} , the negative electrode side DC terminal by the attachment legs L. Therefore, the cooling air can pass between the surface of the rotating shaft 4 and the annular positive electrode side short-circuit plate A8 _6P and negative electrode-side short circuit plate A8 _6N as indicated by an arrow X.

In the configuration example of FIG. 4, which shows a state where the two are connected in parallel modular rectifier _{A8 2U, A8 2V, A8 2W} for each phase, modular rectifier _{A8 2U} may seem two, modular The rectifiers A8 _2V and _A82W are not shown because the second one is in a position hidden behind the rotating shaft 4.

As described above, according to the second embodiment, a short circuit in addition to the effects achieved by the first embodiment, connecting the same polarity between the DC terminals of the modular rectifier _{A8 2U,} A8 _2V, A8 _2W Since the plates A8 _6P and A8 _6N are formed in an annular shape, even if a centrifugal force is applied to the short-circuit plates A8 _6P and A8 _6N due to the rotation of the rotating shaft 4, the centrifugal force is received by the hoop force of the ring, and the stress applied to the mounting portion Can be reduced. In addition, the module type rectifiers A8 _2U , A8 _2V , and _A82W can be efficiently cooled by the fin effect of the annular short-circuit plates A8 _6P and A8 _6N .

(Third embodiment)
Next, a third embodiment of the present invention will be described.
FIG. 5 is a diagram showing a rotary rectifier A8 according to a third embodiment of the present invention. In particular, FIG. 5 (a) is an enlarged view of the rotary rectifier A8, and FIG. 5 (b) is Y in FIG. 5 (a). FIG. 5C is a side view as seen from the direction, and FIG. 5C is a side view of FIG. 2A as seen from the X direction.

The present embodiment and the first embodiment, the mounting direction of the module rectifier _{A8 2U, A8 2V, A8 2W} of the rotary shaft 4 are different. That is, in the case of FIG. 2 (a), has been juxtaposed spaced suitable intervals modular rectifier _{A8 2U, A8 2V, A8 2W} in the circumferential direction of the rotating shaft 4, in the present embodiment, FIG. 5 (a each phase module rectifier A8 2U as shown _{in), A8 2V, A8 to 2W} is the arrangement direction of spaced appropriate intervals in the axial direction of the rotary shaft 4 Moreover input and output terminals at right angles to the rotational axis The point directly attached to is different in structure. Since other points are the same as those in the first embodiment, description thereof is omitted.

In the case of the first embodiment given as a comparative example, the module type rectifiers A8 _2U , A8 _2V , and _A82W are juxtaposed at a predetermined interval in the circumferential direction of the rotating shaft 4, and therefore shown in FIG. As described above, the cooling rectified side _faces of the module rectifying elements A8 _2U , A8 _2V , A82W do not hit the cooling air, or even if they hit, the module rectifying elements A8 _2U , _A82V It is difficult to uniformly cool the rectifying elements U1, U2,..., W3 in the A8 _2W , but in the case of this embodiment, the module-type rectifiers A8 _2U , A8 _2V , A8 _2W of the respective phases are rotated by the rotating shaft 4. By directly attaching the input / output terminals so that the arrangement direction of the input / output terminals is perpendicular to the direction of the rotation axis, the cooling air generated by the rotation of the rotation axis 4 as shown in FIG. Mo It is possible to apply substantially uniform on both sides of Yuru rectifier _{A8 2U, A8 2V, A8 2W} .

As a result, according to the third embodiment, in addition to the operational effects of the first embodiment, the contact area between the cooling air by the rotation of the rotating shaft 4 and the modular rectifiers A8 _2U , A8 _2V , A8 _2W is Since it becomes large, it becomes possible to cool module type rectifier A8 _2U , _A82V , _A82W efficiently, and can suppress the temperature rise of an element.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described.
FIG. 6 is an enlarged view showing a rotary rectifier 8A according to the fourth embodiment of the present invention.
The rotary rectifier A8 according to the fourth embodiment is characterized in that module-type rectifiers A8 _2U , A8 _2V , and A8 _2W are directly attached to the rotary shaft 4 while being inclined with respect to the axial direction.

According to the fourth embodiment, moreover the outer periphery of each phase module rectifier A8 _{2U, A8} 2V to _face, A8 _2W of the rotating shaft 4 at a suitable distance in the axial direction of the rotating shaft 4, with respect to the axial direction Since it is installed at an inclination, in addition to the operational effects exhibited by the first embodiment, cooling air flowing into the field coil 5b can be formed by the fan effect due to the rotation of the module type rectifiers A8 _2U , A8 _2V , A8 _2W . The cooling effect on the field coil 5b can be increased.

(Modification)
(1) In the first to fourth embodiments described above, in the bridge-type three-phase rectifier circuit of FIG. 3, the positive side arm (rectifier element) U1, V1, W1, and the negative side arm (rectifier element) U2, A module-type rectifier is defined by modularizing V2 and W2 as one package for each phase. However, the present invention is not limited to this, and the three-phase shown in the circuit of FIG. A half-wave rectifier circuit may be used. That is, the module type rectifier may be a module in which rectifier elements connected to the respective phases of the rotating armature coil of the AC exciter are configured to form a three-phase half-wave rectifier circuit.

(2) Also, the module type rectifiers A8 _2U , _A82V , and _A82W are not directly attached to the rotating shaft 4, but are attached to a cylindrical intermediate member in advance, and this cylindrical intermediate member is rotated by the AC exciter. The armature may be fitted and fixed before being fitted to the rotating shaft.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the synchronous machine provided with the brushless excitation device by the 1st Embodiment of this invention, (a) is an upper half drawing of the whole synchronous machine provided with the brushless excitation device, (b) is an expansion perspective view of a rotary rectifier. Figure. It is an expansion perspective view of the rotation rectifier concerning a 1st embodiment of the present invention, (a) is a figure showing an attachment state of a module type rectifier, and (b) is a figure showing an example of connection of a DC terminal between module type rectifiers. The circuit diagram which shows the connection state between each phase of a module type rectifier. The expansion perspective view of the rotary rectifier which concerns on 2nd Embodiment of this invention. It is a figure which shows the rotary rectifier which concerns on 3rd Embodiment of this invention, (a) is an expansion perspective view of a rotary rectifier, (b) is the side view which looked at Fig.5 (a) from the Y direction, (c) is FIG. The expansion perspective view of the rotary rectifier which concerns on 4th Embodiment of this invention. The upper half figure of the synchronous machine provided with the conventional brushless excitation device. The expansion perspective view of the conventional rotary rectifier. The circuit diagram of the conventional brushless excitation apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Synchronous machine (main machine), 2 ... Stator frame, 3 ... Stator, 4 ... Rotating shaft, 5 ... Rotor, 5a ... Salient-pole field iron core, 5b ... Field coil, 6 ... Brushless exciter, DESCRIPTION OF SYMBOLS 7 ... AC exciter, 7a ... Rotary armature coil, A8 ... Rotary rectifier, A8 _2U , A8 _2V , A8 _2W ... Module type rectifier, A8 _6P , A8 _6N ... Short-circuit plate, 9 ... Bearing, 10 ... Fan, 11 ... Fan boss, 14 ... intake port, 15 ... exhaust port.

Claims (10)

The rotary armature coil and rotary rectifier of the AC exciter are installed on the rotary shaft of the synchronous machine, and the AC electromotive force generated by the rotary armature coil of the AC exciter is converted to DC power by the rotary rectifier to In a synchronous machine equipped with a brushless excitation device that supplies DC excitation current to a magnetic circuit,
A module type rectifier configured by modularizing a rectifying element for each phase is attached to a rotating shaft between a rotating armature coil of the AC exciter and a field coil of the synchronous machine to configure the rotating rectifier. Synchronous machine with the characteristic brushless excitation device.   2. The synchronous machine with a brushless exciter according to claim 1, wherein the module type rectifier is directly attached on a rotating shaft of the synchronous machine.   The module type rectifier is a module obtained by combining the positive-phase rectifying element and the negative-side rectifying element of the same phase in the bridge-type multiphase rectifier circuit as a unit, and includes one AC input terminal, positive and negative DC outputs The synchronous machine provided with the brushless exciter according to claim 1 or 2 characterized by things.   The modular rectifier is a module in which rectifying elements connected to each phase of a rotating armature coil of an AC exciter are modularized to constitute a three-phase half-wave rectifier circuit. A synchronous machine comprising the brushless exciter described in 2.   The synchronous machine provided with the brushless exciter according to claim 3 or 4, wherein the module type rectifiers for each phase are juxtaposed at an appropriate interval in the circumferential direction of the rotating shaft.   5. The brushless exciter according to claim 3, wherein the module type rectifier for each phase is attached at an appropriate interval in the axial direction of the rotating shaft and in a direction perpendicular to the axial direction. Synchronous machine with   The synchronous machine provided with the brushless exciter according to claim 3 or 4, wherein the same polarity terminals on the output side of each module type rectifier are connected by a short-circuit plate.   8. The synchronous machine provided with a brushless exciter according to claim 7, wherein the short-circuit plate is constituted by a flat plate having a shape along the peripheral surface of the rotating shaft.   8. The synchronous machine provided with the brushless exciter according to claim 7, wherein the short-circuit plate is formed in an annular shape and connected to the module type rectifier of each phase via a mounting leg.   5. The brushless excitation according to claim 3, wherein the module type rectifier of each phase is directly attached to the rotating shaft at an appropriate interval in the axial direction of the rotating shaft and inclined with respect to the axial direction. Synchronous machine with device.

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