Motor

Abstract

An embodiment of the present disclosure is a motor comprising a stator and a housing which is provided to the stator and to which a fan is attached, a ventilation passage which extends along the axial direction of the stator and through which cooling air generated by the fan passes being provided in each of the stator and the housing, a communicating hole that communicates the ventilation passage and the outside of the motor being formed in the stator or the housing, and a sensing unit that senses the flow rate of the cooling air flowing through the communicating hole being provided in the communicating hole.

Description

motor

[0001] The present disclosure relates to a motor.

[0002] Japanese Patent Application Laid-Open Publication No. 2018-85899 discloses an electric motor including a cooling structure for cooling a stator and a housing.

[0003] Stable motor cooling performance is desired.

[0004] One aspect of the present disclosure is a motor comprising a stator and a housing provided on the stator and to which a fan is attached, wherein each of the stator and the housing is provided with an air passage extending along the axial direction of the stator and through which cooling air generated by the fan passes, and a communication hole is formed in the stator or the housing connecting the air passage with the outside of the motor, and the communication hole is provided with a detection unit for detecting the volume of the cooling air flowing through the communication hole.

[0005] FIG. 1 is a diagram schematically illustrating the configuration of a motor according to one embodiment. FIGS. 2A and 2B are diagrams illustrating a detector provided in the motor. FIGS. 3A and 3B are diagrams illustrating a detector provided in a motor according to Modification 1. FIGS. 4A and 4B are diagrams illustrating a regulating member provided in a motor according to Modification 2. FIGS. 5A and 5B are diagrams illustrating a regulating member provided in a motor according to Modification 3. FIGS. 6A and 6B are diagrams illustrating a regulating member provided in a motor according to Modification 4. FIGS. 7A and 7B are diagrams illustrating a regulating member provided in a motor according to Modification 5. FIGS. 8A and 8B are diagrams illustrating a regulating member provided in a motor according to Modification 6.

[0006] In motors equipped with fans, continued use of the fan can cause dust and other particles to become clogged in the ventilation duct through which the cooling air generated by the fan flows. This can impede the flow of cooling air and cause the motor to overheat. If the motor overheats, it may stop.

[0007] 1 is a diagram schematically illustrating the configuration of a motor 10 according to one embodiment. The motor 10 includes a rotor (not shown) provided with a rotating shaft 12, a stator 14, and a housing 16. A ventilation passage RW is provided inside the motor 10, through which cooling air flows to cool the motor 10. The rotating shaft 12 and the rotor rotate about a rotation axis AX. The stator 14 cylindrically covers the rotor.

[0008] The housing 16 is provided on a surface 14a side of the stator 14 in the axial direction DA. The axial direction DA of the stator 14 is the same direction as the rotation axis AX of the rotating shaft 12. The housing 16 has a bracket 18 and a fan cover 20. The bracket 18 rotatably supports the rotating shaft 12 via a bearing (not shown).

[0009] The fan cover 20 is attached to the stator 14 via a bracket 18. A fan 22 is attached to the fan cover 20. The fan 22 has a fan motor and an impeller, both of which are not shown. The fan motor rotates the impeller, causing the fan 22 to generate cooling air. The generated cooling air passes through the ventilation path RW as described above.

[0010] The ventilation passages RW extend through each of the stator 14 and the housing 16 along the axial direction DA of the stator 14. The ventilation passages RW include a first ventilation passage RW1, a second ventilation passage RW2, and a third ventilation passage RW3. The first ventilation passage RW1 is formed within the stator 14. The second ventilation passage RW2 is formed within the bracket 18. The third ventilation passage RW3 is formed within the fan cover 20. The third ventilation passage RW3 may be a space within the fan cover 20.

[0011] The first ventilation passage RW1 communicates with the second ventilation passage RW2. The second ventilation passage RW2 communicates with the third ventilation passage RW3. The third ventilation passage RW3 communicates with the outside air via the ventilation opening 20a of the fan cover 20. In addition, the end of the first ventilation passage RW1 opposite to the end communicating with the second ventilation passage RW2 communicates with the outside air.

[0012] The cooling air is generated, for example, by the air outside the motor 10 flowing into the first ventilation passage RW1 due to the intake of the fan 22. As indicated by the dashed arrow Wi in Fig. 1, the cooling air that has flowed into the first ventilation passage RW1 passes through the second ventilation passage RW2 and the third ventilation passage RW3 in this order, and then flows into the outside air through the ventilation opening 20a.

[0013] The cooling air is generated, for example, by the airflow from the fan 22, which causes the outside air from the motor 10 to flow into the third air passage RW3 through the ventilation opening 20a. As shown by the solid arrow Ws in Figure 1, the cooling air that has flowed into the third air passage RW3 passes through the second air passage RW2 and the first air passage RW1 in this order, and then flows into the outside air.

[0014] Because the first ventilation passage RW1 penetrates the stator 14, it tends to have a smaller cross-sectional area than the third ventilation passage RW3. Therefore, there is a possibility that dust or the like may become clogged in the first ventilation passage RW1. Furthermore, if the cross-sectional areas of the second ventilation passage RW2 and the third ventilation passage RW3 are small, there is also a possibility that dust or the like may become clogged in the second ventilation passage RW2 and the third ventilation passage RW3. If a clog occurs in the ventilation passage RW2, the cooling performance of the motor 10 will be reduced. In this embodiment, if a clog occurs in the ventilation passage RW2, the user is notified of this.

[0015] In this embodiment, a communication hole HL and a detector 50 (see FIGS. 2A, 2B, 3A, and 3B) are provided to detect blockage of the ventilation passage RW. The communication hole HL is formed on the outer peripheral side surface 10a of the motor 10, centered on the rotation axis AX of the rotating shaft 12. The communication hole HL communicates with the ventilation passage RW and with the air outside the motor 10. Some of the cooling air mentioned above may also flow through the communication hole HL. The communication hole HL is provided with a detector 50 that detects the volume of the cooling air flowing through the communication hole HL.

[0016] If the ventilation passage RW is clogged, the volume of the cooling air flowing through the communication hole HL may fluctuate. The detector 50 can detect the fluctuation in the volume of the cooling air flowing through the communication hole HL.

[0017] In response to the detection by the detector 50, the user can remove the blockage in the ventilation channel RW. This reduces the time that the blockage in the ventilation channel RW continues, thereby shortening the time that the motor 10 overheats. This ensures stable motor cooling performance.

[0018] The communication hole HL may be formed in either the stator 14 or the housing 16. For example, it is preferable that the detection unit 50 be able to detect fluctuations in air volume regardless of where a blockage occurs in the first ventilation passage RW1. In this case, the communication hole HL may be formed in the housing 16 at a position close to the stator 14.

[0019] Furthermore, the stator 14 is more likely to heat up than the housing 16. In this case, the communication hole HL may be formed in the stator 14. Because the communication hole HL communicates with the first ventilation passage RW1, cooling air passes through at least a portion of the first ventilation passage RW1. This reduces the possibility that the overheated motor 10 will stop before the blockage in the ventilation passage RW1 is cleared.

[0020] 2A and 2B are diagrams illustrating a detection unit 50 provided in the motor 10. For ease of explanation, the size of the communication hole HL is enlarged in FIGS. 2A and 2B. This also applies to the subsequent figures. An airflow sensor 50A is used as an example of the detection unit 50. The airflow sensor 50A transmits a sensor signal indicating the detected airflow or fluctuations in the airflow to an external device (not shown) of the motor 10. Based on the received sensor signal, the external device notifies the user that there may be a blockage in the ventilation channel RW.

[0021] In FIG. 2A , the cooling air can pass through the ventilation passage RW because there is no blockage DT in the ventilation passage RW. Some of the cooling air also flows through the communication hole HL. In FIG. 2B , the flow of the cooling air through the ventilation passage RW is obstructed because a blockage DT has occurred in the ventilation passage RW. In this case, a pressure difference may occur between the internal pressure Pi of the ventilation passage RW and the external pressure Po of the motor 10. To eliminate this pressure difference, the amount of cooling air flowing through the communication hole HL increases. Note that to eliminate this pressure difference, the cooling air may also flow through gaps in the motor 10. In this case, the amount of cooling air flowing through the communication hole HL decreases.

[0022] In this embodiment, the airflow sensor 50A transmits a sensor signal to an external device based on the detected airflow or fluctuations in the airflow. This allows the user to recognize the possibility of a blockage DT in the air passage RW of the motor 10, even if the user is located far away from the motor 10. By allowing the user to take measures to remove the blockage DT, the motor cooling performance can be expected to become more stable.

[0023] The above embodiment may be modified as follows. In the following modifications, explanations that overlap with the embodiment will be omitted. In addition, in the drawings used in the following modifications, the same reference numerals are used for the same components as those described in the embodiment.

[0024] (Modification 1) The detection unit 50 is not limited to the airflow sensor 50A. Figures 3A and 3B are diagrams illustrating an example of the detection unit 50 provided in the motor 10 according to Modification 1. As another example of the detection unit 50, a whistle 50B is used.

[0025] The whistle 50B is provided so that the diameter of the communication hole HL narrows from the peripheral wall surrounding the communication hole HL of the stator 14 or the housing 16 toward the center of the communication hole HL. The whistle 50B is attached to the peripheral wall of the communication hole HL with an attachment member AT. The whistle 50B may be permanently attached to the peripheral wall of the communication hole HL, or may be detachably attached. By making the whistle 50B detachable, it is possible to attach whistles 50B with different tones or different air volume thresholds for sound generation.

[0026] The whistle 50B emits a sound according to the volume of cooling air flowing through the communication hole HL. Specifically, the whistle 50B emits a sound when the volume of air increases above a predetermined volume, and does not emit a sound when the volume of air decreases below the predetermined volume. Therefore, the whistle 50B can alert the user that a blockage has occurred in the ventilation passage RW.

[0027] In this modification, the whistle 50B starts or stops making a sound depending on the airflow rate. A user near the motor 10 can quickly recognize the possibility of a blockage DT in the air passage RW of the motor 10 based on the change in sound from the whistle 50B. By allowing the user to immediately remove the blockage DT, the motor's cooling performance can be expected to remain stable.

[0028] (Variation 2) In the above embodiment, a portion of the cooling air constantly flows through the communication holes HL. This can cause the communication holes HL to become clogged with dust or other particles. Therefore, in this variation 2, when no blockage DT occurs in the ventilation passage RW, the gas flowing through the communication holes HL is restricted. Figures 4A and 4B are diagrams illustrating a restricting member included in the motor 10 according to variation 2. The restricting member restricts the gas flowing through the communication holes HL.

[0029] In Modifications 2 to 6, the restricting member is, for example, a lid 70 that closes the communication hole HL. In these modifications, the lid 70 closes the communication hole HL at the boundary between the communication hole HL and the ventilation passage RW. The motor 10 has a biasing member 72 that biases the lid 70.

[0030] The biasing member 72 is, for example, an elastic body, and is attached to the peripheral wall of the ventilation passage RW and the lid 70. The biasing member 72 biases the lid 70 so as to open the communication hole HL. The lid 70 opens the communication hole HL in accordance with the pressure difference between the internal pressure Pi of the ventilation passage RW and the external pressure Po of the motor 10. As a result, the lid 70 releases the restriction on the gas flowing through the communication hole HL.

[0031] The lid 70 has a top portion 70a, a peripheral portion 70b, and an inclined portion 70c. The top portion 70a is located in the center of the lid 70. The peripheral portion 70b contacts the peripheral wall of the ventilation passage RW on the outer periphery of the communication hole HL, allowing the lid 70 to close the communication hole HL. The inclined portion 70c is located between the top portion 70a and the peripheral portion 70b. Due to the inclination of the inclined portion 70c, the top portion 70a protrudes from the peripheral portion 70b into the peripheral wall of the ventilation passage RW.

[0032] In the case of the above-described intake airflow, as shown in FIG. 4A , there is no blockage DT in the ventilation channel RW, allowing the cooling airflow toward the fan 22 to pass through the ventilation channel RW. The internal pressure Pi in the ventilation channel RW is equal to or greater than the threshold value Ta (Pi>=Ta). Note that the threshold value Ta is higher than the external pressure Po of the motor 10 (Ta>Po). In this case, the cooling air presses against the inclined surface of the inclined portion 70c of the lid 70 facing the ventilation channel RW, causing the lid 70 to block the communication hole HL against the biasing force of the biasing member 72. Therefore, gas does not flow through the communication hole HL. This reduces the possibility of dust or other particles clogging the communication hole HL.

[0033] When a blockage DT occurs in the ventilation passage RW, as described above, a pressure difference may occur between the internal pressure Pi of the ventilation passage RW and the external pressure Po of the motor 10. FIG. 4B shows an example in which the cooling air flowing from the outside of the stator 14 toward the ventilation opening 20a is blocked by the blockage DT. Because the cooling air is blocked, the internal pressure Pi of the ventilation passage RW decreases. The lid 70 opens the communication hole HL in accordance with the biasing force of the biasing member 72. The cooling air also begins to flow through the communication hole HL, and the air volume is detected by the detection unit 50.

[0034] The biasing member 72 may bias the lid 70 so as to close the communication hole HL. The lid 70 opens the communication hole HL in accordance with the pressure difference between the internal pressure Pi of the ventilation passage RW and the external pressure Po of the motor 10. This allows the lid 70 to release the restriction on the gas flowing through the communication hole HL. In this case, the top portion 70a of the lid 70 does not need to protrude from the peripheral edge portion 70b into the peripheral wall of the ventilation passage RW. In other words, the lid 70 does not have an inclined portion 70c.

[0035] As shown in Fig. 4A, when there is no blockage DT in the ventilation passage RW, the cover 70 closes the communication hole HL in accordance with the biasing force of the biasing member 72. When a blockage DT occurs in the ventilation passage RW as shown in Fig. 4B, the internal pressure Pi of the ventilation passage RW decreases. Therefore, the cover 70 opens the communication hole HL against the biasing force of the biasing member 72.

[0036] According to this modification, if there is no blockage DT in the ventilation passage RW, gas does not flow through the communication hole HL. This reduces the possibility of the communication hole HL becoming clogged with dust or other particles. Therefore, the detection unit 50 can appropriately detect the volume of cooling air flowing through the communication hole HL when the communication hole HL is opened due to the blockage DT.

[0037] (Variation 3) In Variation 2 described above, a blockage DT in the ventilation passage RW reduces the internal pressure Pi in the ventilation passage RW. However, a blockage DT in the ventilation passage RW may increase the internal pressure Pi in the ventilation passage RW. Figures 5A and 5B are diagrams illustrating a restricting member included in motor 10 according to Variation 3. In this variation, a lid 70, which is a restricting member, closes communication hole HL at the boundary between the communication hole HL and the outer peripheral side surface 10a of motor 10.

[0038] The motor 10 has a biasing member 72 that biases the lid 70. The biasing member 72 biases the lid 70 so that the communication hole HL is closed. The lid 70 opens the communication hole HL in accordance with the pressure difference between the internal pressure Pi of the ventilation passage RW and the external pressure Po of the motor 10. As a result, the lid 70 releases the restriction on the gas flowing through the communication hole HL.

[0039] In the case of the above-described air supply, in FIG. 5A , there is no blockage DT in the ventilation channel RW, so the cooling air from the fan 22 can pass through the ventilation channel RW. The cover 70 blocks the communication hole HL in accordance with the biasing force of the biasing member 72. Therefore, gas does not flow through the communication hole HL. This reduces the possibility of dust or other particles clogging the communication hole HL.

[0040] When a blockage DT occurs in the ventilation passage RW, as described above, a pressure difference may occur between the internal pressure Pi of the ventilation passage RW and the external pressure Po of the motor 10. FIG. 5B shows an example in which the blockage DT blocks the cooling airflow from the ventilation opening 20a to the outside of the stator 14. Because the cooling airflow is blocked, the internal pressure Pi of the ventilation passage RW rises. The internal pressure Pi of the ventilation passage RW becomes equal to or greater than the threshold value Tb (Pi>=Tb). Note that the threshold value Tb is higher than the external pressure Po of the motor 10 (Tb>Po). In this case, the cover 70 opens the communication hole HL against the biasing force of the biasing member 72. The cooling air also begins to flow through the communication hole HL, and the airflow is detected by the detection unit 50.

[0041] According to this modification, if there is no blockage DT in the ventilation passage RW, gas does not flow through the communication hole HL. This reduces the possibility of the communication hole HL becoming clogged with dust or other particles. Therefore, the detection unit 50 can appropriately detect the volume of cooling air flowing through the communication hole HL when the communication hole HL is opened due to the blockage DT.

[0042] (Variation 4) In Variation 2 described above, the biasing member 72 biases the lid 70. However, the lid 70 itself may be the biasing member. Figures 6A and 6B are diagrams illustrating a restricting member included in the motor 10 according to Variation 4. In this variation, the lid 70 blocks the communication hole HL at the boundary between the communication hole HL and the ventilation passage RW.

[0043] The lid 70 is a biasing member that is biased to open the communication hole HL. A portion 70d of the peripheral edge of the lid 70 is fixed to an area of ​​the peripheral wall surrounding the ventilation passage RW that is located on the periphery of the communication hole HL. A portion 70e of the peripheral edge of the lid 70 that is not fixed to the peripheral wall surrounding the ventilation passage RW is biased. This opens the communication hole HL. The lid 70 opens the communication hole HL in accordance with the pressure difference between the internal pressure Pi of the ventilation passage RW and the external pressure Po of the motor 10. This allows the lid 70 to release the restriction on the gas flowing through the communication hole HL.

[0044] In the case of the above-described intake airflow, as shown in FIG. 6A , there is no blockage DT in the ventilation channel RW, allowing the cooling airflow toward the fan 22 to pass through the ventilation channel RW. The internal pressure Pi in the ventilation channel RW is equal to or greater than the threshold value Tc (Pi>=Tc). Note that the threshold value Tc is higher than the external pressure Po of the motor 10 (Tc>Po). In this case, the cooling air presses the inclined surface of the biased portion 70e of the lid 70 facing the ventilation channel RW, causing the lid 70 to block the communication hole HL against the biasing force of the lid 70. Therefore, gas does not flow through the communication hole HL. This reduces the possibility of dust or other particles clogging the communication hole HL.

[0045] When a blockage DT occurs in the ventilation passage RW, as described above, a pressure difference may occur between the internal pressure Pi of the ventilation passage RW and the external pressure Po of the motor 10. FIG. 6B shows an example in which the cooling air flowing from the outside of the stator 14 toward the ventilation opening 20a is blocked by the blockage DT. Because the cooling air is blocked, the internal pressure Pi of the ventilation passage RW drops. The lid 70 opens the communication hole HL according to the biasing force of the lid 70. New cooling air begins to flow through the communication hole HL, and the air volume is detected by the detection unit 50.

[0046] The lid 70 may close the communication hole HL in accordance with the biasing force of the lid 70. As shown in FIG. 6A , when there is no blockage DT in the ventilation passage RW, the lid 70 maintains a state in which the communication hole HL is closed. As shown in FIG. 6B , when a blockage DT occurs in the ventilation passage RW, the internal pressure Pi of the ventilation passage RW decreases. The lid 70 opens the communication hole HL against the biasing force of the lid 70 in accordance with the pressure difference between the internal pressure Pi of the ventilation passage RW and the external pressure Po of the motor 10. This causes the lid 70 to release the restriction on the gas flowing through the communication hole HL.

[0047] According to this modification, if there is no blockage DT in the ventilation passage RW, gas does not flow through the communication hole HL. This reduces the possibility of the communication hole HL becoming clogged with dust or other particles. Therefore, the detection unit 50 can appropriately detect the volume of cooling air flowing through the communication hole HL when the communication hole HL is opened due to the blockage DT.

[0048] (Variation 5) In Variation 3 described above, the biasing member 72 biases the lid 70. However, the lid 70 itself may be the biasing member. Figures 7A and 7B are diagrams illustrating a restricting member included in the motor 10 according to Variation 5. In this variation, the lid 70 closes the communication hole HL at the boundary between the communication hole HL and the outer peripheral side surface 10a of the motor 10.

[0049] The lid 70 is a biasing member biased to close the communication hole HL. A portion 70f of the peripheral edge of the lid 70 is fixed to an area of ​​the outer peripheral side surface 10a of the motor 10 that is located on the periphery of the communication hole HL. A portion 70g of the peripheral edge of the lid 70 that is not fixed to the outer peripheral side surface 10a of the motor 10 is biased. This blocks the communication hole HL. The lid 70 opens the communication hole HL in accordance with the pressure difference between the internal pressure Pi of the ventilation passage RW and the external pressure Po of the motor 10. This allows the lid 70 to release the restriction on gas flowing through the communication hole HL.

[0050] In the case of the above-described air supply, in FIG. 7A , there is no blockage DT in the ventilation channel RW, so the cooling air from the fan 22 can pass through the ventilation channel RW. The lid 70 blocks the communication hole HL according to the biasing force of the lid 70. Therefore, gas does not flow through the communication hole HL. This reduces the possibility of dust or other particles clogging the communication hole HL.

[0051] When a blockage DT occurs in the ventilation passage RW, as described above, a pressure difference may occur between the internal pressure Pi of the ventilation passage RW and the external pressure Po of the motor 10. FIG. 7B shows an example in which the blockage DT blocks the cooling airflow from the ventilation opening 20a to the outside of the stator 14. Because the cooling airflow is blocked, the internal pressure Pi of the ventilation passage RW rises. The internal pressure Pi of the ventilation passage RW becomes equal to or greater than the threshold value Td (Pi>=Td). Note that the threshold value Td is higher than the external pressure Po of the motor 10 (Td>Po). In this case, the lid 70 opens the communication hole HL against its biasing force in response to the pressure difference between the internal pressure Pi of the ventilation passage RW and the external pressure Po of the motor 10. The cooling air also begins to flow through the communication hole HL, and the airflow volume is detected by the detection unit 50.

[0052] According to this modification, if there is no blockage DT in the ventilation passage RW, gas does not flow through the communication hole HL. This reduces the possibility of the communication hole HL becoming clogged with dust or other particles. Therefore, the detection unit 50 can appropriately detect the volume of cooling air flowing through the communication hole HL when the communication hole HL is opened due to the blockage DT.

[0053] (Variation 6) In Variations 2 to 5 described above, the lid 70, which is a restricting member, closes or opens the communication hole HL against the biasing force. However, the restricting member is not limited to this lid 70. FIGS. 8A and 8B are diagrams illustrating a restricting member included in the motor 10 according to Variation 6. In this variation, the lid 70 closes the communication hole HL at the boundary between the communication hole HL and the ventilation passage RW. However, the same applies when the lid 70 closes the communication hole HL at the boundary between the communication hole HL and the outer peripheral side surface 10a of the motor 10.

[0054] The motor 10 has a drive member 80 that drives the lid 70. When the drive member 80 drives the lid 70, the lid 70 can close or open the communication hole HL. The drive member 80 detects the internal pressure Pi of the ventilation passage RW and the external pressure Po of the motor 10 using a pressure sensor (not shown). The drive member 80 opens the communication hole HL in response to the pressure difference between the internal pressure Pi of the ventilation passage RW and the external pressure Po of the motor 10. This causes the lid 70 to release the restriction on the gas flowing through the communication hole HL.

[0055] In FIG. 8A , there is no blockage DT in the ventilation passage RW, allowing the cooling air to pass through the ventilation passage RW. The internal pressure Pi of the ventilation passage RW is equal to or greater than the threshold value Te (Pi>=Te). Note that the threshold value Te is higher than the external pressure Po of the motor 10 (Te>Po). In this case, the cover 70 blocks the communication hole HL as driven by the drive member 80. Therefore, gas does not flow through the communication hole HL. This reduces the possibility of dust or other particles clogging the communication hole HL.

[0056] When a blockage DT occurs in the ventilation passage RW, as described above, a pressure difference can occur between the internal pressure Pi of the ventilation passage RW and the external pressure Po of the motor 10. FIG. 8B shows an example in which the cooling air is blocked by the blockage DT. Because the cooling air is blocked, the internal pressure Pi of the ventilation passage RW drops. The cover 70 opens the communication hole HL as driven by the drive member 80. The cooling air also begins to flow through the communication hole HL, and the air volume is detected by the detection unit 50.

[0057] According to this modification, if there is no blockage DT in the ventilation passage RW, gas does not flow through the communication hole HL. This reduces the possibility of the communication hole HL becoming clogged with dust or other particles. Therefore, the detection unit 50 can appropriately detect the volume of cooling air flowing through the communication hole HL when the communication hole HL is opened due to the blockage DT.

[0058] (Variation 7) The motor 10 may be provided with a plurality of ventilation passages RW, and a plurality of communication holes HL may be formed in each ventilation passage RW. In this case, a detector 50 is provided in each of the plurality of communication holes HL. This makes it easier to identify the location of the blockage DT.

[0059] (Modification 8) The above modifications 1 to 7 may be combined as appropriate within a range that does not cause contradiction.

[0060] In the above embodiment and modified example, the detection unit 50 is provided in the communication hole HL. This allows the user to recognize the possibility that a blockage DT has occurred in the ventilation passage RW of the motor 10. By allowing the user to take measures to remove the blockage DT, the stability of the motor cooling performance can be expected.

[0061] The following additional notes are provided regarding the above-described embodiment and modifications.

[0062] (Supplementary Note 1) The present disclosure relates to a motor (10) comprising a stator (14) and a housing (16) provided on the stator and having a fan (22) attached thereto, wherein each of the stator and the housing is provided with an air passage (RW) extending along the axial direction (DA) of the stator and through which cooling air generated by the fan passes, and the stator or the housing is formed with a communication hole (HL) communicating the air passage with the outside of the motor, and the communication hole is provided with a detection unit (50) for detecting the volume of the cooling air flowing through the communication hole.

[0063] (Supplementary Note 2) In the motor described in Supplementary Note 1, the housing may be provided on the axial surface (14a) side of the stator, and the communication hole may communicate with the ventilation passage and an outer peripheral side surface (10a) of the motor.

[0064] (Appendix 3) The motor described in Appendix 1 or 2 may have a regulating member that regulates the gas flowing through the communication hole, and the regulating member may release the regulation of the gas depending on the pressure difference between the internal pressure (Pi) of the ventilation passage and the external pressure (Po) of the motor.

[0065] (Supplementary Note 4) In the motor according to Supplementary Note 3, the restricting member may be a lid (70) that closes the communication hole.

[0066] (Appendix 5) The motor described in Appendix 4 may further include a biasing member (72) that biases the lid so that the communication hole opens, and when the internal pressure is equal to or greater than a threshold value (Ta) that is higher than the external pressure, the lid may close the communication hole against the biasing force of the biasing member.

[0067] (Appendix 6) The motor described in Appendix 4 may further include a biasing member that biases the lid so that the communication hole is closed, and when the internal pressure is equal to or greater than a threshold value (Tb) that is higher than the external pressure, the lid may open the communication hole against the biasing force of the biasing member.

[0068] (Appendix 7) In the motor described in Appendix 4, the lid may be a biasing member biased to open the communication hole, and when the internal pressure is equal to or greater than a threshold value (Tc) higher than the external pressure, the lid may close the communication hole against the biasing force of the lid.

[0069] (Appendix 8) In the motor described in Appendix 4, the lid may be a biasing member biased to close the communication hole, and when the internal pressure is equal to or greater than a threshold value (Td) higher than the external pressure, the lid may open the communication hole against the biasing force of the lid.

[0070] (Appendix 9) In the motor described in any of Appendices 1 to 8, the housing may have a fan cover (20) that covers the fan and a bracket (18) for attaching the fan cover to the stator, and the communication hole may be formed in the bracket or the fan cover.

[0071] (Supplementary Note 10) In the motor according to any one of Supplementary Notes 1 to 9, the detection unit may be an air volume sensor (50A).

[0072] (Supplementary Note 11) In the motor according to any one of Supplementary Notes 1 to 9, the detection unit may be a whistle unit (50B) that emits a sound in accordance with the air volume.

[0073] (Supplementary Note 12) In the motor according to Supplementary Note 11, the whistle portion may be detachable from the communication hole.

[0074] Although the present disclosure has been described in detail, the present disclosure is not limited to the individual embodiments described above. Various additions, substitutions, modifications, partial deletions, etc. are possible in these embodiments without departing from the gist of the present disclosure or the spirit of the present disclosure derived from the content of the claims and their equivalents. These embodiments can also be implemented in combination. For example, in the above-described embodiments, the order of each operation and the order of each process are shown as examples and are not limited to these. The same applies when numerical values ​​or mathematical expressions are used in the description of the above-described embodiments.

[0075] REFERENCE SIGNS LIST 10... motor 12... rotating shaft 14... stator 16... housing 18... bracket 20... fan cover 22... fan 50... detection unit 70... lid 72... biasing member 80... driving member

Claims

1. a stator; a housing provided on the stator and to which a fan is attached; Equipped with a ventilation passage extending along the axial direction of the stator and through which cooling air generated by the fan passes is provided in each of the stator and the housing; a communication hole is formed in the stator or the housing, the communication hole communicating the ventilation passage with the outside of the motor; The communication hole is provided with a detector that detects the amount of cooling air flowing through the communication hole.

2. 2. The motor according to claim 1, the housing is provided on a surface side of the stator in the axial direction, The communication hole communicates the ventilation passage with the outer peripheral side surface of the motor.

3. 2. The motor according to claim 1, a restricting member that restricts the gas flowing through the communication hole; The regulating member releases the restriction on the gas in accordance with a pressure difference between the internal pressure of the ventilation passage and the external pressure of the motor.

4. 4. The motor according to claim 3, The restricting member is a cover that closes the communication hole.

5. 5. The motor according to claim 4, a biasing member that biases the lid so that the communication hole is opened, When the internal pressure is equal to or greater than a threshold value that is higher than the external pressure, the cover closes the communication hole against the biasing force of the biasing member.

6. 5. The motor according to claim 4, a biasing member that biases the lid so that the communication hole is closed, When the internal pressure is equal to or greater than a threshold value that is higher than the external pressure, the cover opens the communication hole against the biasing force of the biasing member.

7. 5. The motor according to claim 4, the cover is a biasing member that is biased so as to open the communication hole, When the internal pressure is equal to or greater than a threshold value higher than the external pressure, the lid closes the communication hole against the biasing force of the lid.

8. 5. The motor according to claim 4, the cover is a biasing member biased to close the communication hole, When the internal pressure is equal to or greater than a threshold value higher than the external pressure, the lid opens the communication hole against the biasing force of the lid.

9. The motor according to any one of claims 1 to 8, the housing has a fan cover that covers the fan and a bracket for attaching the fan cover to the stator, The motor, wherein the communication hole is formed in the bracket or the fan cover.

10. The motor according to any one of claims 1 to 8, The detection unit is an air volume sensor.

11. The motor according to any one of claims 1 to 8, The detection unit is a whistle that makes a sound according to the air volume.

12. 12. The motor of claim 11, The whistle portion is detachable from the communication hole.