JP7061090B2 - Partial discharge detection system, rotary electric machine, and partial discharge detection method - Google Patents

Description

The present invention relates to a partial discharge detection system, a rotary electric machine including the partial discharge detection system, and a partial discharge detection method.

It is known that when an electric motor is driven by an inverter, a surge voltage is generated due to high-speed switching of the inverter, which affects the insulation of the motor winding. Such a surge voltage is called an inverter surge, and the voltage value may reach twice or more the rated voltage of the motor. When an inverter surge is applied to the winding of a motor, there is a concern that partial discharge will occur inside and outside the winding. Partial discharge causes deterioration of, for example, the enamel wire film constituting the winding. If the film deteriorates, it will eventually lead to dielectric breakdown. Therefore, it is necessary to design the motor so that partial discharge does not occur even if an inverter surge is applied to the winding of the motor.

Conventionally, the insulation performance of the winding of a motor is evaluated based on a partial discharge test by applying a predetermined impulse voltage and detecting the presence or absence of partial discharge using a simulated sample such as an arrow pair or a motorette, or a stator coil. It had been. Since partial discharge occurs at weak points in insulation such as voids and insufficient distance between conductors, if the location where partial discharge occurs can be identified, the position of the weak points can be clarified, and effective insulation reinforcement can be achieved.

As a method for detecting the location where a partial discharge occurs, the method shown in Patent Document 1 has been proposed. The antenna, which is a partial discharge sensor, is moved in the circumferential direction of the stator to be measured, the time until the strongest discharge signal is detected is measured, and the antenna position corresponding to the shortest time is specified as the partial discharge generation location. ..

Further, in order to monitor an abnormality in the temperature of a rotating electric machine covered with a housing that does not transmit light, Patent Document 2 proposes a technique of capturing synchrotron radiation with a camera and comparing it with a normal image.

Japanese Unexamined Patent Publication No. 2005-69745 International Publication No. WO2008 / 044263

The detection of partial discharge in the stator winding conductor is most useful for subsequent countermeasures, especially to know which slot it originated from. That is, if the position in the circumferential direction can be specified, it is possible to determine in which slot the stator winding conductor is arranged.

However, in order to specify the position in the circumferential direction, it is necessary to arrange as many stationary antennas and cameras as possible in the circumferential direction, but it is practically difficult to arrange them at intervals corresponding to the circumferential spacing of the slots. be.

Further, depending on the voltage level applied to an object such as a motor, the partial discharge may not occur immediately after the application but may occur several minutes to several hours later. In such a case, the occurrence of partial discharge may be overlooked.

The present invention has been made to solve such a problem, and an object of the present invention is to specify a position where a partial discharge is generated when a voltage is applied to a rotary electric machine.

In order to achieve the above object, the partial discharge detection system according to the present invention is a partial discharge detection system that specifies the position of a partial discharge from the stator winding, and is a shaft with respect to the stator core and the rotor core. A light detector attached to the rotor shaft on one side in the direction, aligned axially with the gap between the stator core and the rotor core, rotating with the rotor shaft, and detecting light emission during partial discharge. , A fixed-position light emitter that is statically fixed in one place in the circumferential direction so as to face the light detection device and continues to emit light, and a periodic light emission from the fixed-position light emitter. It is characterized by comprising a circumferential position specifying device for specifying a circumferential position of the partial discharge based on an optical signal and an optical signal generated by light emission of the partial discharge.

Further, the rotary electric machine according to the present invention is arranged with a rotor having a rotor shaft extending in the axial direction and a rotor core attached to the rotor shaft via a gap on the radial outer side of the rotor core. A stator having a stator core and stator windings formed in the stator core and arranged in a plurality of slots formed in the stator core and penetrating in the axial direction at intervals in the circumferential direction, and the rotation of the rotor shaft. Rotation with two bearings that rotatably support the rotor shaft at each portion of the core on both sides in the axial direction and a partial discharge detection system that locates the partial discharge from the stator windings. In the electric machine, the partial discharge detection system is attached to the rotor shaft on one side in the axial direction with respect to the stator core and the rotor core, and is attached between the stator core and the rotor core. An optical detector provided with an optical detector that is aligned axially with the void and rotates with the rotor shaft to detect light emission during partial discharge, and one location in the circumferential direction so as to face the optical detector. The position in the circumferential direction of the partial discharge is specified based on the fixed-position light emitter that is statically fixed to and continues to emit light, the periodic optical signal due to the light emitted from the fixed-position light emitter, and the optical signal due to the light emission of the partial discharge. It is characterized by being provided with a circumferential position specifying device.

Further, in the partial discharge detection method according to the present invention, the step of setting the fixed position light emitter to the light emitting state during the operation of the rotary electric machine and the phase calculation unit when the signal discrimination unit determines that the signal is a new optical signal are described above. A step of calculating the phase based on the optical signal from the fixed position light emitter and the new optical signal, and a step of the circumferential position calculation unit calculating the circumferential position of the partial discharge based on the phase. The new optical signal is attached to the rotor shaft on one side in the axial direction with respect to the stator core and the rotor core, and is attached to the rotor shaft in the air gap and axial direction between the stator core and the rotor core. It is characterized in that it is an optical signal of light emission at the time of partial discharge detected by an optical detector that rotates together with the rotor shaft .

According to the present invention, it is possible to specify the position where a partial discharge occurs when a voltage is applied to the rotary electric machine.

It is a vertical sectional view of the rotary electric machine which concerns on 1st Embodiment. It is a block diagram which shows the structure of the partial discharge detection system which concerns on 1st Embodiment. FIG. 3 is a cross-sectional view taken along the line III-III of FIG. 1 showing a part of the partial discharge detection system according to the first embodiment. FIG. 1 is a cross-sectional view taken along the line IV-IV of FIG. 1 showing a part of the partial discharge detection system according to the first embodiment. It is a flow figure which shows the procedure of the partial discharge detection method which concerns on 1st Embodiment. It is a graph which shows the time change of the optical signal which explains the partial discharge detection method which concerns on 1st Embodiment. It is a conceptual cross-sectional view explaining the specification of the circumferential position of a partial discharge in the partial discharge detection method which concerns on 1st Embodiment. It is a graph which shows the time change of the optical signal explaining the case where a plurality of photodetectors are provided in the partial discharge detection method which concerns on 1st Embodiment. It is a block diagram which shows the structure of the partial discharge detection system which concerns on 2nd Embodiment. It is a vertical sectional view of the rotary electric machine which concerns on 2nd Embodiment. It is a graph which shows the time change of the acoustic signal which explains the partial discharge detection method which concerns on 2nd Embodiment. It is a conceptual vertical sectional view explaining the specification of the axial position of a partial discharge in the partial discharge detection method which concerns on 2nd Embodiment.

Hereinafter, the rotary electric machine, the partial discharge detection system, and the partial discharge detection method according to the embodiment of the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a vertical sectional view of a rotary electric machine according to the first embodiment.

The rotary electric machine 200 includes a rotor 10, a stator 20, a frame 30, a coupling side bearing 32a, an anti-coupling side bearing 32b, a cooler 40, and a partial discharge detection system 100 shown in FIG.

The rotor 10 has a horizontally extending rotor shaft 11 and a cylindrical rotor core 12 attached to the radial outside of the rotor shaft 11. A coupling portion 11a that can be coupled to a coupling target by, for example, bolts and nuts is formed at one end of the rotor shaft 11. Hereinafter, in the rotary electric machine 200, the direction of the coupling portion 11a is referred to as a coupling side, and the opposite side thereof is referred to as an anti-coupling side. The rotor shaft 11 is rotatably supported by a coupling side bearing 32a and a non-coupling side bearing 32b on both sides in the axial direction with the rotor core 12 interposed therebetween. Further, an inner fan 15 is attached to a portion of the rotor shaft 11 between the rotor core 12 and the anti-coupling side bearing 32b.

The stator 20 includes a stator core 21 arranged on the radial outer side of the rotor core 12 via a gap 18, and a stator formed on the inner surface of the stator core 21 at intervals and penetrating in the axial direction. It has a winding 22 and.

The frame 30 is provided so as to surround the radially outer side of the stator 20. The frame 30 has a tubular shape, and a coupling side bearing bracket 34a and an anti-coupling side bearing bracket 34b are attached to the axial end portion. The coupling side bearing bracket 34a and the anti-coupling side bearing bracket 34b statically support the coupling side bearing 32a and the anti-coupling side bearing 32b, respectively.

A cooler 40 is attached to the frame 30. The cooler 40 has a cooling pipe 41 and a cooler cover 42 for accommodating the cooling pipe 41. The frame 30, the coupling side bearing bracket 34a, the anti-coupling side bearing bracket 34b and the cooler cover 42 are combined with each other to form a closed space 30a. The space inside the frame 30 and the space inside the cooler cover 42 are communicated with each other by the cooler inlet opening 43 and the cooler outlet opening 44 formed on the inner fan 15 side to form a closed space 30a as a whole.

The partial discharge detection system 100 includes a fixed position light emitter 101 (FIG. 2), an optical detection device 110, an optical signal receiver 120, and a circumferential position identification device 130. The fixed position light emitter 101 is attached to the stator core 21 and is always in a light emitting state during measurement, as will be described later with reference to FIG.

Here, the light related to the fixed-position light emitter 101, the light detection device 110, the optical signal receiver 120, and the like includes not only visible light but also, for example, ultraviolet rays, and the light including ultraviolet rays is hereinafter referred to as light.

The photodetector 110 is attached to a portion of the rotor shaft 11 between the rotor core 12 and the coupling side bearing 32a, and rotates together with the rotor shaft 11. The optical signal receiver 120 is attached to the inner surface of the coupling side bearing bracket 34a. The circumferential position specifying device 130 is connected to the optical signal receiver 120 by a transmission line 120a and is installed outside the machine. The circumferential position specifying device 130 is attached to the outer surface of the coupling side bearing bracket 34a or the outer surface of the frame 30. Alternatively, it may be installed separately near the rotary electric machine 200 or in a separate room.

FIG. 2 is a block diagram showing a configuration of the partial discharge detection system according to the first embodiment.

As described above, the partial discharge detection system 100 includes a fixed position light emitter 101, an optical detection device 110 attached to the rotor shaft 11, and an optical signal receiver 120 attached to the inner surface of the coupling side bearing bracket 34a. It has a circumferential position specifying device 130 installed outside the machine.

The photodetector 110 includes a photodetector 111 that detects light and an optical signal transmitter 112 that transmits the detected photodetection signal. Here, as described above, the photodetector 111 may be an element that senses ultraviolet light as well as an element that senses visible light. The optical signal transmitter 112 has a portion having a transmission function of a signal that can be transmitted wirelessly, such as a radio wave, and converts the signal received by the photodetector 111 into a wireless signal and transmits the signal.

The optical signal receiver 120 receives the optical detection signal transmitted by the optical signal transmitter 112 of the optical detection device 110. For example, when the optical detection signal is transmitted when the optical detection device 110 is on the opposite side in the circumferential direction and there is a possibility that the optical signal receiver 120 cannot receive the optical signal receiver 120, the optical signal receiver 120 is spaced in the circumferential direction. You may install multiple units at the same time.

Here, the transmission / reception of the signal between the optical signal transmitter 112 and the optical signal receiver 120 is not limited to the method using radio waves as described above, and may be, for example, a method using light as a medium.

The circumferential position specifying device 130 includes an input unit 131, an optical signal storage unit 132, a control unit 133, an output unit 134, and a calculation unit 140.

The input unit 131 receives an optical signal from the optical signal receiver 120. The optical signal storage unit 132 stores and stores the optical signal received by the input unit 131. The form of storage is, for example, a form in which the time and the intensity of the optical signal correspond to each sampling interval. The optical signal storage unit 132 stores a predetermined period of time, for example, one day's worth, and the stored contents are updated by time movement such as erasing the old part and adding new information sequentially with the passage of time. It may be done. Alternatively, the amount may be stored and stored in another storage device at predetermined intervals.

The output unit 134 outputs the calculation result of the calculation unit 140. The output unit 134 is realized by hardware such as a display such as an LCD, a printer, a connector for outputting a signal, and an interface using an electronic circuit.

The control unit 133 controls the processing timing of each unit constituting the circumferential position specifying device 130, and controls the exchange of information between the units.

The calculation unit 140 includes a signal discrimination unit 141, a phase calculation unit 142, and a circumferential position calculation unit 143.

The signal discrimination unit 141 determines whether or not the optical signal received by the input unit 131 exceeds a predetermined threshold value, and determines that the signal is significant only when the optical signal exceeds a predetermined level. Therefore, the signal discrimination unit 141 has, for example, a wave height discriminator. It is assumed that the signal level from the fixed position light emitter 101 (FIG. 4), which will be described later, sufficiently exceeds the above-mentioned threshold value.

The phase calculation unit 142 calculates the phase of the optical signal from the new optical signal other than the optical signal from the fixed position light emitter 101 received by the input unit 131 and the optical signal from the fixed position light emitter 101.

The circumferential position calculation unit 143 calculates the circumferential position where the new optical signal is emitted based on the phase of the new optical signal received by the input unit 131, and identifies the stator slot.

FIG. 3 is a cross-sectional view taken along the line III-III of FIG. 1 showing a part of the partial discharge detection system according to the first embodiment. Although it is not originally included in the arrow of FIG. 3, for convenience of dimensional explanation, the positions corresponding to the outer circumference of the rotor core 12 and the inner circumference of the stator core 21 are indicated by broken lines. The dimensions from the center of rotation to each position are indicated as R1 and R2, respectively, and the gap 18 between the rotor core 12 and the stator core 21 is also indicated.

FIG. 3 shows the configuration of a photodetector 110 that is part of the partial discharge detection system 100. The photodetector 110 includes a photodetector 111, an optical signal transmitter 112, a support 113, and a boss 114.

The boss 114 is attached to the front side of the coupling side bearing 32a in FIG. 3, that is, the portion of the rotor shaft 11 between the coupling side bearing 32a and the rotor core 12 so as to surround the radial outside of the rotor shaft 11. There is. The boss 114 may be fitted into the rotor shaft 11, or may be divided in the circumferential direction and connected to each other by bolts or the like.

A support portion 113 is attached to the boss 114 and extends radially outward from a position corresponding to the gap 18. A photodetector 111 and an optical signal transmitter 112 are attached to each support portion 113. The photodetector 111 is provided at a position corresponding to the gap 18 in the radial direction. Further, the optical signal transmitter 112 is provided inside the photodetector 111 in the radial direction.

FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG. 1 showing a part of the partial discharge detection system according to the first embodiment. The partial discharge detection system 100 has a fixed position light emitter 101 attached to a predetermined circumferential position P0 at the radial inner end of the stator core 21. The fixed position light emitter 101 always emits light while the detection by the partial discharge detection system 100 is performed.

The light emitted by the fixed position light emitter 101 has directionality. The direction in which the emitted light should propagate is the direction of the photodetector 111 when the photodetector 111 is in the same circumferential position as the circumferential position of the fixed position light emitter 101. That is, the direction is substantially parallel to the longitudinal direction of the rotor shaft 11. Cylindrical guides (not shown) may be provided around the position light emitter 101 to avoid radiation or scattering of light in directions other than the direction in which it should propagate. Alternatively, the focus may be optically focused at the position of the photodetector 111.

Further, as shown in FIG. 1, the vicinity of the outer side of the axial end of the stator core 21 is the outer portion of the stator core 21 of the stator winding 22, that is, the end processing portion of the stator winding 22. If it is provided at the end of the stator core 21, the light emitted from the fixed position light emitter 101 may not reach the photodetector 111. In this case, it may be arranged outside the axial direction of the terminal portion of the stator winding 22. In this case, the fixed position light emitter 101 may be supported by the frame 30.

FIG. 5 is a flow diagram showing the procedure of the partial discharge detection method according to the first embodiment.

Partial discharge detection is performed under the operating state of the rotary electric machine 200 (step S01). First, the fixed position light emitter 101 is put into a light emitting state (step S02).

In this state, the signal discrimination unit 141 determines the presence / absence of a new optical signal (step S03).

FIG. 6 is a graph showing a time change of an optical signal for explaining the partial discharge detection method according to the first embodiment. The horizontal axis represents time, and the vertical axis represents the intensity of the optical signal received by the input unit 131 of the circumferential position specifying device 130.

A fixed signal SF generated by the light emitted by the fixed position light emitter 101 is input at each time interval t0. That is, the photodetector 111 rotates in the circumferential direction and passes through the circumferential position P0 provided with the fixed position light emitter 101 for each round. Here, the time interval t0 is the time required for the photodetector 111 to go around. When the rotation speed of the rotor 10 is N times per second, t0 is obtained by the following equation (1).
t0 = 1 / N ... (1)

In this way, in a steady state where a fixed signal SF is input every t0, a new optical signal SB is input after a certain fixed signal SF and before the next fixed signal SF, and its intensity level is changed. When the predetermined level Ls is exceeded, the signal discrimination unit 141 determines that this is a significant signal and determines that it is a new optical signal SB.

If the signal discrimination unit 141 does not determine that the signal is a new optical signal (step S04 NO), steps S03 and S04 are repeated.

When the signal discrimination unit 141 determines that it is a new optical signal (step S04 YES), the phase calculation unit 142 calculates the phase of the new optical signal (step S05). The phase Θ is given by the following equation (2).
Θ = 2π ・ t1 / t0 ・ ・ ・ (2)
Here, t1 is a time interval between the fixed signal SF and the new optical signal SB.

As the data for calculating the phase Θ, the data stored in the optical signal machine 100 million unit 132 that sequentially stores the optical signals received by the input unit 131 is used. As the reception time of the optical signal, for example, the time when the predetermined threshold value is first reached may be set as the reception time. Alternatively, the reception time may be an intermediate value between the time when a predetermined threshold value is reached and the time when the predetermined threshold value is crossed.

Next, the circumferential position calculation unit 143 calculates the circumferential position P1 based on the phase Θ calculated by the phase calculation unit 142, and specifies the slot (step S06).

FIG. 7 is a conceptual cross-sectional view illustrating the specification of the circumferential position of the partial discharge in the partial discharge detecting method according to the first embodiment.

Now, let the number of slots formed in the stator 21 be N. As shown in FIG. 7, when viewed from the outside of the end of the stator 20, the slots adjacent to the fixed position light emitter 101 are numbered clockwise in the slot S1 and next to the slot S2, and finally the slot is numbered. , Counterclockwise becomes the slot SN adjacent to the fixed position light emitter 101.

The phase Θ calculated in step S05 and the slot Sm in which the stator winding conductor of the stator winding 22 that emits light is housed have the relationship of the following equation (3).
Θ / (2π) = (0.5 + m) / N ... (3)

Therefore, the number m of the corresponding slot Sm is given by the following equation (4).
m = (N · Θ) / (2π) -0.5 ・ ・ ・ (4)

When the calculated value of m is almost an integer, it can be identified as the stator winding conductor housed in the m-th slot.

If it is not determined that the calculated value of m is approximately an integer m ₀ , it is determined that it is one of the slots before and after it.

Here, the criterion for determining the integer m ₀ is the case where the following equation (5) is satisfied.
m ₀ -α <m <m ₀ + α ・ ・ ・ (5)
(However, α is a positive decimal number sufficiently smaller than 1.)
For example, α may be about 0.1 to 0.3.

As described above, as shown in FIG. 3, the case where one photodetector 111 is provided has been described, but the present invention is not limited to this. That is, the photodetectors 111 may be provided on the plurality of support portions 113 at intervals from each other in the circumferential direction on the boss 114.

FIG. 8 is a graph showing a time change of an optical signal illustrating a case where a plurality of photodetectors are provided in the partial discharge detection method according to the first embodiment. FIG. 8 shows a case where two photodetectors 111 are provided. In this case, the time interval t0 is half the time interval when there is one photodetector 111.

Further, in the relationship between the new optical signal SB and the fixed signal SF from the photodetector 111, it is not possible to distinguish which photodetector 111 lags the phase. Therefore, as shown in FIG. 8, the phase is set to the generation time difference t1 between the immediately preceding fixed signal SF and the new optical signal SB, and the generation time difference t2 between the previous fixed signal SF and the new optical signal SB. It will be calculated based on. Therefore, two slot positions calculated by this are also obtained, and the result is that the light emitting source is one of the stator winding conductors housed in these two slot positions.

Similarly, when the M photodetectors 111 are provided, the M slot positions are calculated, so that the light emitting source is one of the stator winding conductors housed in the M slot positions. The result is obtained.

Normally, a large number of slots are formed in the stator core 21 of the rotary electric machine 200. Narrowing down the slot positions in which the stator winding conductors, which are light emitting sources, are housed even if there are a plurality of them, has a great effect on the restoration of the rotary electric machine 200.

As described above, the partial discharge detection system 100 according to the present embodiment can specify the position where the partial discharge occurs when the voltage is applied to the rotary electric machine 200 which is the object to be measured.

[Second Embodiment]
FIG. 9 is a block diagram showing a configuration of the partial discharge detection system according to the second embodiment.

The second embodiment is a modification of the first embodiment. The partial discharge detection system 100a according to the second embodiment further includes an axial position specifying device 150. In other respects, it is the same as the first embodiment. Hereinafter, the axial position specifying device 150 will be described.

The axial position specifying device 150 includes a first acoustic signal detector 151, a second acoustic signal detector 152, a time difference measuring unit 160, and an axial position calculating unit 170.

The first acoustic signal detector 151 and the second acoustic signal detector 152 each detect an acoustic signal emitted when a partial discharge occurs. The time difference measuring unit 160 measures the time difference that the acoustic signals from each of the first acoustic signal detector 151 and the second acoustic signal detector 152 arrive. The axial position calculation unit 170 calculates the axial position of the location where the acoustic signal is generated based on the time difference measured by the time difference measurement unit 160.

FIG. 10 is a vertical sectional view of the rotary electric machine according to the second embodiment.

The first acoustic signal detector 151 is arranged in the vicinity of the coupling side bearing 32a and in the vicinity of the inside of the coupling side bearing bracket 34a. Further, the second acoustic signal detector 152 is arranged on the opposite side of the rotor iron core 12 from the first acoustic signal detector 151, in the vicinity of the anti-coupling side bearing 32b and in the vicinity of the inside of the anti-coupling side bearing bracket 34b. Has been done.

The time difference measuring unit 160 and the axial position calculating unit 170 are housed in, for example, a housing outside the frame 30. Acoustic signals from the first acoustic signal detector 151 and the second acoustic signal detector 152 are input to the time difference measuring unit 160 via the transmission unit 150a.

FIG. 11 is a graph showing a time change of an acoustic signal for explaining the partial discharge detection method according to the second embodiment.

When the acoustic signals P1 and P2 from the first acoustic signal detector 151 and the second acoustic signal detector 152 are input and the intensity level exceeds a predetermined level L0, the time difference measuring unit 160 sets these acoustics. The time difference t2 at which the signal arrives is measured.

FIG. 12 is a conceptual vertical cross-sectional view illustrating the identification of the axial position of the partial discharge in the partial discharge detecting method according to the second embodiment.

Now, consider a case where an acoustic signal is generated at a position of ΔX from the end of the stator core 21 on the side close to the first acoustic signal detector 151. In this case, the following relational expression (6) holds.
(L2 + H-ΔX)-(ΔX + L1) = t2 ・ V ・ ・ ・ (6)
However, L1 is the distance between the first acoustic signal detector 151 and the end of the stator core 21, L2 is the distance between the second acoustic signal detector 152 and the end of the stator core 21, and H is the distance between the stator core 21. The axial length of, V indicates the speed of sound.

Therefore, the axial position ΔX at which the acoustic signal is generated is calculated by the following equation (7).
ΔX = (L2-L1 + Ht2 ・ V) / 2 ・ ・ ・ (7)

As described above, the partial discharge detection system 100a according to the second embodiment can specify the position in the axial direction in addition to the angular position in the circumferential direction for the location where the partial discharge has occurred.

[Other embodiments]
Although the embodiments of the present invention have been described above, the embodiments are presented as examples and are not intended to limit the scope of the invention.

For example, in the embodiment, the optical signal receiver 120 receives the signal from the optical signal transmitter 112, and the signal discrimination unit 141 discriminates whether or not the signal is a significant signal distinguishable from the background. The case of is shown as an example, but the present invention is not limited to this. For example, the optical signal transmitter 112 may output a pulse signal when the signal from the photodetector 111 has a certain intensity or higher. In this case, the signal discrimination unit 141 is not required in the circumferential position specifying device 130.

Furthermore, these embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and variations thereof are included in the scope of the invention described in the claims and the equivalent scope thereof, as are included in the scope and gist of the invention.

10 ... Rotor, 11 ... Rotor shaft, 11a ... Coupling part, 12 ... Rotor core, 15 ... Inner fan, 18 ... Air gap, 20 ... Fixture, 21 ... Fixture core, 22 ... Fixture winding, 30 Frame, 30a ... closed space, 32a ... coupling side bearing, 32b ... anti-coupling side bearing, 34a ... coupling side bearing bracket, 34b ... anti-coupling side bearing bracket, 40 ... cooler, 41 ... cooling pipe, 42 ... cooler Cover, 43 ... cooler inlet opening, 44 ... cooler outlet opening, 100, 100a ... partial discharge detection system, 101 ... fixed position light emitter, 110 ... optical detector, 111 ... optical detector, 112 ... optical signal transmitter , 113 ... Support unit, 114 ... Boss, 120 ... Optical signal receiver, 120a ... Transmission line, 130 ... Circumferential position specifying device, 131 ... Input unit, 132 ... Optical signal storage unit, 133 ... Control unit, 134 ... Output Unit, 140 ... Calculation unit, 141 ... Signal discrimination unit, 142 ... Phase calculation unit, 143 ... Circumferential position calculation unit, 150 ... Axial position identification device, 150a ... Transmission unit, 151 ... First acoustic signal detector, 152 ... second acoustic signal detector, 160 ... time difference measurement unit, 170 ... axial position calculation unit, 200 ... rotary electric machine

Claims (6)

A partial discharge detection system that identifies the position of partial discharge from the stator windings.
Attached to the rotor shaft on one side in the axial direction with respect to the stator core and the rotor core, the stator core and the rotor core are aligned in the axial direction with the gap between the stator core and the rotor core, and rotate together with the rotor shaft. A photodetector including a photodetector that detects light emission during partial discharge,
A fixed-position light emitter that is statically fixed in one place in the circumferential direction so as to face the photodetector and continues to emit light.
A circumferential position specifying device that specifies the circumferential position of the partial discharge based on a periodic optical signal generated by light emitted from the fixed position light emitter and an optical signal generated by light emitted from the partial discharge.
A partial discharge detection system, characterized in that it comprises. The photodetector detects light emitted by the partial discharge and the periodic optical signal from the home position light emitter .
The photodetector is
An optical signal transmitter that wirelessly transmits an optical signal detected by the photodetector,
The partial discharge detection system according to claim 1, wherein the system is provided with. The circumferential position specifying device is
A phase calculation unit that calculates the phase of light emission due to the partial discharge with respect to a periodic optical signal due to light emission from the fixed position light emitter, and a phase calculation unit.
A circumferential position calculation unit that calculates the circumferential position of the stator winding that emits light due to the partial discharge based on the phase, and a circumferential position calculation unit.
The partial discharge detection system according to claim 1 or 2, wherein the partial discharge detection system is provided. The partial discharge detection system according to any one of claims 1 to 3, further comprising an axial position specifying device for specifying an axial position of light emission due to the partial discharge. A rotor having a rotor shaft extending in the axial direction and a rotor core attached to the rotor shaft, and a rotor.
A stator core arranged radially outside the rotor core via a gap, and a stator formed in the stator core and arranged in a plurality of slots vertically spaced apart from each other in the circumferential direction. With a stator with windings,
Two bearings that rotatably support the rotor shaft at each portion of the rotor shaft on both sides in the axial direction of the rotor core,
A partial discharge detection system that identifies the position of the partial discharge from the stator winding,
It is a rotary electric machine equipped with
The partial discharge detection system is
It is attached to the rotor shaft on one side in the axial direction with respect to the stator core and the rotor core, is aligned axially with the gap between the stator core and the rotor core, and rotates together with the rotor shaft. A photodetector including a photodetector that detects light emission during partial discharge,
A fixed-position light emitter that is statically fixed in one place in the circumferential direction so as to face the photodetector and continues to emit light.
A circumferential position specifying device that specifies the circumferential position of the partial discharge based on a periodic optical signal generated by light emitted from the fixed position light emitter and an optical signal generated by light emitted from the partial discharge.
A rotary electric machine characterized by being equipped with. During the operation of the rotary electric machine, the step of setting the fixed position light emitter to the light emitting state and
When the signal discrimination unit determines that the optical signal is new, the phase calculation unit calculates the phase based on the optical signal from the fixed position light emitter and the new optical signal.
A step in which the circumferential position calculation unit calculates the circumferential position of the partial discharge based on the phase, and
Have,
The new optical signal is attached to the rotor shaft on one side in the axial direction with respect to the stator core and the rotor core, and is aligned axially with the gap between the stator core and the rotor core. A method for detecting partial discharge , which is an optical signal of light emitted at the time of partial discharge detected by a photodetector that rotates together with a shaft .

Images