JP4566594B2 - Temperature measuring device for rotating body of rotating electrical machine - Google Patents

Description

  The present invention relates to a temperature measuring device and a temperature measuring method for measuring the temperature of each part of a rotating body of a rotating electrical machine, and relates to a small and inexpensive temperature measuring device.

  Rotating electrical machines with a safety-explosion-proof structure must satisfy the national explosion-proof certification regulations, and the factory electrical equipment explosion-proof guidelines define the temperature tolerance of rotating electrical machines that touch explosive atmospheres. In the case of the explosion-proof certification, it is necessary to detect the temperature of the rotating body. In particular, in the JIS standard (JIS C 0934) of the safety explosion-proof structure consistent with the international standard (IEC standard), the maximum surface temperature of the rotating electrical machine is allowed. Since the value is specified, the temperature at a plurality of measurement points must be measured in order to detect the highest temperature portion of the rotating body.

  As a multi-point temperature measuring device for a rotating body of the rotating electrical machine, conventionally, a large number of temperature measuring elements attached to a large number of measuring points in the rotating body, mounted on the rotating body, and from each of the temperature measuring elements described above A switching device provided with changeover switch means for connecting each connected contact to connection wires of a small number of channels to the outside, an amplifier for amplifying the output signal taken out by this changeover, and a filter for removing noise, and the rotator A plurality of slip rings connected to each connecting wire from the switching device, a plurality of brushes in contact with each slip ring, connected to a connecting wire from the brush installed in a fixed portion, and the switching A power supply unit that supplies operating power to the switch means, a switching operation means that sends a switching operation signal, an amplifier that amplifies the output signal from the switching device, and noise. Of a rotating body provided with a control device provided with a filter for performing the processing, and a data processing device which receives an output from the control device directly or via a recording device and generates a required chart of the temperature at each measurement point. There is a multi-point temperature measurement device (see, for example, Patent Document 1).

  Further, the measuring device is configured to output the outputs of a plurality of temperature detection elements mounted on the rotating body via an input device including a slip ring provided on a rotating shaft that rotates integrally with the shaft of the rotating body and a brush that contacts the slip ring. A signal conversion processing device for time-division processing and serial transmission of a plurality of outputs of the temperature detection element is attached to the rotation side of the input device, and the transmission output is stationary via the slip ring and brush. There is also an input device of a temperature measuring device for a rotating body, which is characterized by being taken out to the side (see, for example, Patent Document 2).

Japanese Patent Laid-Open No. 56-014128 (Claims, pages 2 to 3, FIGS. 3 to 4) Japanese Patent Laid-Open No. 56-0119199 (Claims, page 2, FIG. 2)

  However, the above-described conventional temperature measuring device can accurately measure in real time the temperature at a plurality of measurement points of a rotating rotating body. However, the changeover switch means, the changeover device, the slip ring, the changeover operation means, and the control Since a device is used or a time-division signal conversion processing device is used, the temperature measuring device is complicated and large, and is very expensive.

  The present invention has been made in view of the above, and it is an object of the present invention to obtain a small and inexpensive temperature measuring device and temperature measuring method for a rotating body of a rotating electrical machine.

In order to solve the above-described problems and achieve the object, a temperature measuring device for a rotating body of a rotating electrical machine according to the present invention includes a plurality of temperature detection elements installed at a plurality of measurement points of the rotating body of the rotating electrical machine, A plurality of conductors connected to each of the plurality of temperature detection elements, directly led to the non-load side of the rotating electrical machine through a gap provided in the rotating shaft of the rotating electrical machine, and a hollow shaft on the anti-load side of the rotating shaft through mounted, the plurality of respective external connection terminals of wires so as to protrude from the outer periphery to hold the equally spaced radially, axially symmetric as centroid position is the center of rotation of the rotary shaft And a temperature measuring instrument having a plurality of temperature measuring channels connected to each of the external connection ends when the rotating body is stopped.

  According to the present invention, there is no need to use a large-scale device such as a changeover switch means, a changeover device, a slip ring, a changeover operation means and a control device, or a time division signal conversion processing device.

  According to the present invention, there is an effect that a small and inexpensive temperature measuring device is obtained.

  Embodiments of a temperature measuring device and a temperature measuring method for a rotating body of a rotating electrical machine according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a longitudinal sectional view of a fully-enclosed fan-shaped squirrel-cage induction motor equipped with the temperature measuring device according to the first embodiment, FIG. 2 is a diagram showing a temperature measurement location of a rotating body, and FIG. 3 is a line AA in FIG. FIG. 4 is a view taken in the direction of arrow B in FIG. 1, FIG. 5 is a view showing the temperature measurement method of Embodiment 1, and FIG. 6 is a view showing the temperature measurement results of each thermocouple.

  In the figure, a stator core 1 is formed in a cylindrical shape by laminating a number of electromagnetic steel plates such as silicon steel, and a coil 2 is mounted in a plurality of slots, and is inserted and fixed in a cylindrical frame 3. The rotor core 4 is formed in a cylindrical shape by laminating a large number of electromagnetic steel plates such as silicon steel, and has a plurality of slots 4a. The end ring 5 is integrally formed with the rotor core 4, and eight heat radiating fins 5 a are attached to the end ring 5. A rotating shaft 6 having a groove 6a as a gap through which the conducting wire 12 passes is inserted into the rotor core 4 and fixed. The rotor core 4, the end ring 5, and the rotating shaft 6 constitute a rotating body 200.

  The rotating shaft 6 is rotatably supported by a load side bracket 7 and an anti-load side bracket 8 which are fitted to the front and rear ends of the frame 3 via bearings 9 and 9. A cooling fan 10 that cools the rotating electrical machine 100 is attached to the shaft end of the rotating shaft 6 behind the anti-load side bracket 8, and a cover 11 that covers the cooling fan 10 is attached to the anti-load side bracket 8. Yes. The rotating electrical machine 100 configured in this manner is driven to rotate by supplying electric power to the coil 2 from a power supply unit (not shown).

As shown in FIG. 2, the thermocouple _{12b 1 ~12b 10 (12b 7 ~12b} 10 as a temperature detecting element to a total of 10 places of the outer peripheral side eight places and around the end rings 1 each in the slot 4a of the rotor core 4 (Not shown) is attached, and each conducting wire 12 is pulled out to the rear side (the anti-load side) of the rotating electrical machine 100 through the groove 6a as the gap of the rotating shaft 6. The groove 6a may be a hole. A hollow shaft 13 is attached to the cooling fan 10 by a bolt 13b via a flange 13a, and a disc 14 is attached to the rear end of the hollow shaft 13. Each conducting wire 12 is drawn out through the groove 6a and the hollow shaft 13, and is arranged radially at equal intervals on the rear surface of the disk 14 so that the external connection end 12a protrudes from the outer periphery of the disk 14. Further, it is fixed to the disc 14 by a presser plate 15 which is screwed with a screw 15a. The hollow shaft 13, the disk 14, and the presser plate 15 constitute an external connection end holding means 300, and are formed in an axisymmetric shape so that the center of gravity is the rotation center of the rotation shaft 6. In the temperature measuring device 400 having a plurality of temperature measurement channels, each measurement channel is connected to each external connection end 12a when the rotating body 200 is stopped.

Next, a temperature measurement method according to the first embodiment will be described with reference to FIGS. First, the rotating electrical machine 100 is continuously operated at the maximum rated load, and the surface temperature of the rotating body 200 is raised to the saturation point. Next, power supply to the rotating electrical machine 100 is cut off, the rotating body 200 is stopped, and temperature measurement of a temperature measuring device (not shown) is started simultaneously with the stop. Then, gripping the external connection terminal 12a of the temperature measuring instrument alligator clip 16 with each conductor 12 connected to each measurement channel, and quickly connected to each thermocouple 12b ₁ ~12b ₁₀ and each measurement channel, in FIG. 6 As shown, the temperature change of each of the thermocouples 12b ₁ to 12b ₁₀ for a predetermined time (for example, 1 minute) is measured and recorded after the rotating body 200 is stopped in each measurement channel. Next, from the recorded time-temperature curves of the thermocouples 12b ₁ to 12b ₁₀ , the temperature at each measurement point immediately after the rotating body 200 is stopped is obtained by the extension method.

  As described above, in the temperature measurement device according to the first embodiment, the cooling fan 10 and the cover 11 of the rotating electrical machine of the general-purpose machine are modified, the hollow shaft 13 and the disc 14 are attached, and the rotating body 200 is rotating. The external connection end 12a of the conducting wire 12 is fixed with a holding plate 15 so that it does not move, and has a simple structure with a small number of parts, and is small and inexpensive. The maximum temperature measurement method is simple because it uses the extension method. In addition, since the lead wire 12 is drawn out to the anti-load side (rear side) where there is no obstruction, not to the load side of the rotating electrical machine 100, and connected to the temperature measuring device, the connection workability between the tip 12a and the alligator clip 16 is good. It can be applied regardless of the difference in the mounting method of the rotating electrical machine 100 such as the foot mounting method and the flange mounting method.

Embodiment 2. FIG.
A temperature measuring device and a temperature measuring method for a rotating body of a rotating electrical machine according to a second embodiment of the present invention will be described with reference to FIGS. FIG. 7 is a longitudinal sectional view of a fully-enclosed fan-shaped squirrel-cage induction motor equipped with the temperature measuring device according to the second embodiment, FIG. 8 is a diagram showing a temperature measurement point of the rotating body, and FIG. 9 is a CC line in FIG. FIG. 10 is a view taken in the direction of arrow D in FIG. 7, FIG. 11 is a view showing a temperature measurement method according to Embodiment 2, and FIG. 12 is a view showing a temperature measurement result of each thermocouple. In these drawings, the same components as those shown in FIGS. 1 to 6 are designated by the same reference numerals, and the description thereof is omitted.

  A hollow shaft 13 is attached to the cooling fan 10 by a bolt 13b through a flange 13a, a support member 17 is attached to a rear end of the hollow shaft 13 by a screw 17a, and a screw is attached to a rear end of the support member 17. A hollow mounting plate 18 is attached by 18a, and a pin connector 19 is attached to the mounting plate 18 by screws 19c. Each conducting wire 12 is drawn through the groove 6a and the hollow shaft 13, and each tip is connected to each internal connector pin 19a of the pin connector 19, and each internal connector pin 19a is connected to each external connector pin as an external connection end. 19b. Each external connector pin 19b is fixedly held by the pin connector 19 with a predetermined interval. The hollow shaft 13, the support member 17, the mounting plate 18, and the pin connector 19 constitute the external connection end holding means 300 and are formed in an axisymmetric shape so that the position of the center of gravity is the rotation center of the rotation shaft 6. The temperature measuring device 400 having a plurality of temperature measuring channels is connected to the pin connector 19 via the measuring connector 20 when the rotating body 200 stops.

Next, a temperature measurement method according to the second embodiment will be described with reference to FIGS. First, the rotating electrical machine 100 is continuously operated at the maximum rated load, and the surface temperature of the rotating body 200 is raised to the saturation point. Next, the power supply to the rotating electrical machine 100 is cut off, the rotating body 200 is stopped, and the temperature measurement of the temperature measuring device 400 is started simultaneously with the stop. Then, by connecting the measuring connector 20 connected to the respective measurement channels of the temperature measurement device 400 to the pin connector 19, to quickly connect the respective measurement channels with each thermocouple 12b ₁ ~12b _10, 12 As shown, the temperature change of each of the thermocouples 12b ₁ to 12b ₁₀ for a predetermined time (for example, 1 minute) is measured and recorded after the rotating body 200 is stopped in each measurement channel. Next, from the recorded time-temperature curves of the thermocouples 12b ₁ to 12b ₁₀ , the temperature at each measurement point immediately after the rotating body 200 is stopped is obtained by the extension method.

  The measurement connector 20 and the pin connector 19 can be connected within 5 seconds. As shown in FIG. 12, the temperature measurement is performed at all temperature measurement points within 5 seconds after the rotating body 200 is stopped. Are simultaneously started, the temperature at each measurement point immediately after the rotating body 200 is stopped can be accurately obtained by the extension method.

  As described above, the temperature measuring apparatus according to the second embodiment modifies the cooling fan 10 and the cover 11 of the rotating electrical machine of the general-purpose machine, and includes the hollow shaft 13, the support member 17, the mounting plate 18, and the pin connector 19. It has a simple structure with a small number of parts, and is small and inexpensive. Further, since the connector connection is used, the temperature measurement can be performed quickly, and the maximum temperature measurement method is simple because the extension method is used. Further, since the lead wire 12 is drawn out to the anti-load side (rear side) where there is no obstruction, not to the load side of the rotating electrical machine 100 and connected to the temperature measuring device 400, the connection workability of the connectors 20 and 19 is good, and the foot mounting The present invention can be applied regardless of the attachment method of the rotating electrical machine 100 such as the method and the flange attachment method.

Embodiment 3 FIG.
A temperature measuring device and a temperature measuring method for a rotating body of a rotating electrical machine according to a third embodiment of the present invention will be described with reference to FIGS. 13 is a longitudinal cross-sectional view of a fully-enclosed fan-shaped squirrel-cage induction motor equipped with the temperature measuring device according to the third embodiment, FIG. 14 is an arrow view seen from the direction of arrow E in FIG. FIG. 16 is a development view seen from the direction of arrow F in FIG. 15, FIG. 17 is a diagram showing a temperature measurement method according to the third embodiment, and FIG. 18 is a temperature measurement result of each infrared temperature measuring instrument. FIG. In these drawings, the same components as those shown in FIGS. 1 to 6 are designated by the same reference numerals, and the description thereof is omitted.

  The rotor core 4 is formed in a cylindrical shape by laminating a large number of electromagnetic steel plates such as silicon steel, and has a plurality of slots 4a. For the purpose of suppressing abnormal phenomena such as abnormal torque and vibration, the slot 4a is formed so as to be inclined with respect to the rotation axis as shown in FIG. 16, and the stator core 1 extends from one end of the rotor core 4 to the other end. In general, it is formed so as to be shifted by one pitch of each slot. A slot groove 4b having a depth of 2 mm, a width of 5 mm, and a half length of the rotor core width is formed along the outer periphery of one slot 4a, and is formed on the outer periphery of the slot 4a at a position rotated by 90 ° from the slot groove 4b formation position. A slot groove 4c having a quarter length of the rotor core width is formed along the outer periphery of the slot 4a at a position rotated by 90 ° from the slot groove 4c formation position. A groove 4d is formed.

  A shaft end key groove 6b is formed on the load side of the rotary shaft 6, and the circumferential position of the shaft end key groove 6b coincides with the circumferential position of the slot groove 4b. Installation holes are provided at four locations shifted by 90 ° in the circumferential direction of the load side bracket 7, and four infrared temperature measuring devices 21 a, 21 b, 21 c, 21 d as optical temperature measuring devices are installed in the installation holes. ing. The infrared temperature measuring instrument is a temperature measuring instrument that can measure the temperature of the measurement point in a non-contact manner by emitting infrared rays 22 toward the temperature measurement point. The radial installation positions of the infrared temperature measuring devices 21a to 21c are the same as the radial positions of the slot grooves 4b to 4d, and the inclination angles with respect to the rotation axis are the same as the inclination angles of the slot grooves 4b to 4d. The installation position of the infrared temperature measuring device 21d in the radial direction is within the radial width of the end ring 5 and is installed parallel to the rotation axis.

  The anti-load side bracket 8 is also provided with an installation hole in one place, and one infrared temperature measuring device 21e is installed. The radial installation position is within the radial width of the end ring 5 and is installed parallel to the rotation axis. Each conducting wire 12 from the infrared temperature measuring devices 21 a to 21 e is connected to each measuring channel of the temperature measuring device 400.

  The infrared temperature measuring device 21a measures the temperature of the end face of the slot groove 4b that is ½ the depth of the rotor core, the infrared temperature measuring device 21b measures the temperature of the end face of the slot groove 4c that is ¼ the depth of the rotor core width, The infrared temperature measuring instrument 21c measures the temperature of the end face at the back of the rotor core width of the slot groove 4d. The infrared temperature measuring instrument 21d measures the temperature of the end face of the end ring 5 on the load side, and the infrared temperature measuring instrument 21e. Measures the temperature of the end face of the end ring 5 on the anti-load side.

  Next, a temperature measurement method according to the third embodiment will be described with reference to FIGS. First, the rotating electrical machine 100 is continuously operated at the maximum rated load, and the surface temperature of the rotating body 200 is raised to the saturation point. Next, the power supply to the rotating electrical machine 100 is cut off, the rotating body 200 is stopped, and the temperature measurement of the temperature measuring device 400 (not shown) is started simultaneously with the stop. Next, by matching the circumferential position of the shaft end key groove 6b with the position of the infrared temperature measuring device 21a, the circumferential position of the slot groove 4b of the rotating body 200 is matched with the position of the infrared temperature measuring device 21a (this The positioning operation can also be performed using a servo motor or the like.) Temperature measurement by the infrared temperature measuring devices 21a to 21e is started. As shown in FIG. 18, after the rotating body 200 is stopped in each measurement channel, the temperature change of each of the infrared temperature measuring devices 21a to 21e for a predetermined time (for example, 1 minute) is measured and recorded. Next, from the recorded time-temperature curves of the infrared temperature measuring devices 21a to 21e, the temperature at each measurement point immediately after the rotating body 200 is stopped is obtained by the extension method.

  The circumferential alignment of the slot groove 4b of the rotating body 200 and the infrared temperature measuring device 21a can be performed within 3 seconds, and as shown in FIG. 18, within 3 seconds after the rotating body 200 stops. Since the temperature measurement of all the temperature measurement points is started simultaneously, the temperature of each measurement point immediately after the rotating body 200 is stopped can be accurately obtained by the extension method.

  As described above, in the temperature measuring apparatus according to the third embodiment, the slot cores 4b, 4c, and 4d are provided in the rotor core 4 of the rotating electrical machine of the general-purpose machine, and the infrared temperature measurement is performed on the load side bracket 7 and the anti-load side bracket 8. It is a simple structure with a small number of parts, in which the containers 21a to 21e are installed, and is small and inexpensive. Moreover, since each conducting wire 12 is connected to the temperature measuring device 400 from the beginning, the temperature can be measured quickly, and the maximum temperature measuring method is simple because the extension method is used.

  In addition, it is a temperature measurement method that uses an infrared temperature measuring instrument that measures the temperature of the measurement point by emitting infrared rays, and there is no work range limitation. The present invention can be applied regardless of the attachment method of the electric machine 100. Moreover, since it is not necessary to attach a temperature detection element such as a thermocouple to the temperature measurement point in the temperature measurement devices of the first and second embodiments, the measurement preparation time can be shortened.

  In addition, although the case where the infrared temperature measuring device was used was demonstrated in the said Embodiment 3, a laser beam temperature measuring device may be used as an optical temperature measuring device.

  INDUSTRIAL APPLICABILITY The temperature measuring device for a rotating body of a rotating electrical machine according to the present invention is useful for an explosion-proof test of a rotating electrical machine having a safety explosion-proof structure.

It is a longitudinal cross-sectional view of the fully-enclosed fan-shaped squirrel-cage induction motor equipped with the temperature measurement device of the first embodiment. It is a figure which shows the temperature measurement location of a rotary body. It is sectional drawing which follows the AA line of FIG. It is the arrow view seen from the arrow B direction of FIG. 3 is a diagram illustrating a temperature measurement method according to Embodiment 1. FIG. It is a figure which shows the temperature measurement result of each thermocouple. It is a longitudinal cross-sectional view of the fully-enclosed fan-shaped squirrel-cage induction motor equipped with the temperature measurement device of the second embodiment. It is a figure which shows the temperature measurement location of a rotary body. It is sectional drawing which follows the CC line of FIG. It is the arrow view seen from the arrow D direction of FIG. 6 is a diagram illustrating a temperature measurement method according to Embodiment 2. FIG. It is a figure which shows the temperature measurement result of each thermocouple. It is a longitudinal cross-sectional view of the fully-enclosed fan-shaped squirrel-cage induction motor equipped with the temperature measurement device of the third embodiment. It is the arrow view seen from the arrow E direction of FIG. It is the arrow view which looked at the rotary body from the arrow E direction. It is the expanded view seen from the arrow F direction of FIG. 6 is a diagram illustrating a temperature measurement method according to Embodiment 3. FIG. It is a figure which shows the temperature measurement result of each infrared temperature measuring device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stator core 2 Coil 3 Frame 4 Rotor core 4a Slot 4b, 4c, 4d Slot groove 5 End ring 6 Rotating shaft 6a Groove 6b Shaft end key groove 7 Load side bracket 8 Anti-load side bracket 9 Bearing 10 Cooling fan 11 Cover 12 Conductor 12a the external connection terminals _{12b 1, 12b 2, 12b 3} , 12b 4, 12b 5, 12b 6 thermocouple (temperature detecting element)
DESCRIPTION OF SYMBOLS 13 Hollow shaft 14 Disc 15 Holding plate 16 Alligator clip 17 Support member 18 Mounting plate 19 Pin connector 19a Internal connector pin 19b External connector pin 20 Measurement connector 21a-21e Infrared temperature measuring device 22 Infrared 100 Rotating electrical machine 200 Rotating body 300 External connection end holding means 400 Temperature measuring device

Claims (2)

A plurality of temperature detection elements installed at a plurality of measurement points of the rotating body of the rotating electrical machine;
A plurality of conducting wires connected to each of the plurality of temperature detection elements, directly led to the opposite side of the rotating electrical machine through a gap provided in a rotating shaft of the rotating electrical machine;
Wherein the anti-load side of the rotary shaft via the hollow shaft is mounted, and held equally spaced radially to each external connection terminals of the plurality of conductors so as to protrude from the outer periphery, the rotational center of gravity position is the A disk formed in an axisymmetric shape so as to be the center of rotation of the shaft;
A temperature measuring instrument having a plurality of temperature measuring channels connected to the external connection ends when the rotating body is stopped;
A temperature measuring device for a rotating body of a rotating electrical machine. A plurality of temperature detection elements installed at a plurality of measurement points of the rotating body of the rotating electrical machine;
A plurality of conducting wires connected to each of the plurality of temperature detection elements, directly led to the opposite side of the rotating electrical machine through a gap provided in a rotating shaft of the rotating electrical machine;
The centroid position through the hollow shaft to the anti-load side of the rotary shaft is mounted such that the center of rotation of said rotary shaft, and a pin connector connected to the external connection terminals of the plurality of conductors in each connector pin,
A temperature measuring instrument having a plurality of temperature measuring channels connected to the connector pins when the rotating body is stopped;
A temperature measuring device for a rotating body of a rotating electrical machine.

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