Electric motor, ventilation fan, blower, and electric fan

Abstract

To provide an electric motor, a ventilation fan, a blower, and an electric fan that are unlikely to fail.SOLUTION: In an electric motor 1, a cover 5 covers a terminal block 4 on the outside of an electric motor body 2. The cover 5 has a cover opposing part 52 that opposes a housing 23 of the electric motor body 2 in an axial direction of a rotary shaft 3. A cover through-hole 53 is provided in the cover opposing part 52. The rotary shaft 3 is passed through the cover through-hole 53 from the electric motor body 2 and protrudes outside the cover 5. A tubular partition member 6 is arranged on the inside of the cover. When looking at the partition member 6 along the axial direction of the rotary shaft 3, the cover through-hole 53 is accommodated on the inside of the partition member 6, and the terminal block 4 is disposed on the outside of the partition member 6. The partition member 6 is in contact with each of the housing 23 and the cover opposing part 52.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to electric motors, ventilating fans, blowers, and electric fans.

Background Art

[0002] Patent Document 1 discloses an electric motor in which a frame and a bracket are coupled to each other in the axial direction of a rotating shaft to form an outer shell, and the rotating shaft is supported by bearings on each of the frame and the bracket. The rotating shaft protrudes from the inside of the outer shell through a through hole of the frame to the outside of the frame. Inside the outer shell, a rotor fixed to the rotating shaft and a stator opposed to the outer peripheral portion of the rotor are provided. A terminal block is attached to an end face of the bracket opposite to the frame. The terminal block is covered by a cover attached to the bracket. A pin protruding from the stator penetrates the bracket and the terminal block. The pin is electrically connected to a joint provided on the terminal block.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the conventional electric motor disclosed in Patent Document 1, the rotating shaft passes through the through hole of the frame and protrudes to the outside of the frame. However, in the conventional electric motor disclosed in Patent Document 1, the rotating shaft does not protrude to the outside of the cover located on the side opposite to the frame.

[0005] In a ventilating fan or the like, a fan is attached to the rotating shaft of the electric motor. When the conventional electric motor disclosed in Patent Document 1 is used for a ventilating fan, the fan can be attached only to a portion of the rotating shaft that protrudes from the through hole of the frame to the outside of the frame.

[0006] In the case of a ventilation fan or the like, an electric motor having a two-shaft structure in which a rotating shaft projects from each of a frame and a cover may be used. When the electric motor having the two-shaft structure is used in a ventilation fan or the like, a fan can be individually attached to a portion of each of the rotating shafts that projects from the frame and the cover.

[0007] In the conventional electric motor disclosed in Patent Document 1, through holes are provided in each of a bracket, a terminal block, and a cover, and by passing the rotating shaft through the through holes of the bracket, the terminal block, and the cover, the rotating shaft can be made to project outside the cover through the through hole of the cover. However, there is a risk that foreign matter such as moisture and dust may enter the inside of the cover from the through hole of the cover.

[0008] Since the terminal block disposed inside the cover is disposed outside the outer shell, for example, there is a risk that pins of different poles disposed on the terminal block may be electrically short-circuited by foreign matter that has entered the inside of the cover. Therefore, the electric motor is likely to fail.

[0009] The present disclosure addresses the above-described problems and aims to provide an electric motor, a ventilation fan, a blower, and a fan that are less likely to fail.

Means for Solving the Problems

[0010] The motor according to the present disclosure includes a motor main body, a rotating shaft rotatably provided on the motor main body, a terminal block mounted on the motor main body outside the motor main body, a cover covering the terminal block outside the motor main body, and a cylindrical partition member disposed inside the cover. The motor main body has a rotor that rotates integrally with the rotating shaft, a stator facing the outer peripheral portion of the rotor with a gap therebetween, and a housing that houses the rotor and the stator. The cover has a cover facing portion that faces the housing in the axial direction of the rotating shaft. A cover through hole is provided in the cover facing portion. The rotating shaft passes through the cover through hole from the motor main body and protrudes outside the cover. When looking at the partition member along the axial direction of the rotating shaft, the cover through hole is accommodated inside the partition member, and the terminal block is disposed outside the partition member. The partition member is in contact with each of the housing and the cover facing portion.

Effect of the Invention

[0011] According to the present disclosure, motors, ventilating fans, blowers, and electric fans can be made less prone to failure.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Best Mode for Carrying Out the Invention

[0013] The embodiments for carrying out the subject matter of the present disclosure will be described with reference to the accompanying drawings. In each figure, the same or corresponding parts are denoted by the same reference numerals, and duplicate descriptions will be appropriately simplified or omitted as necessary. Note that the subject matter of the present disclosure is not limited to the following embodiments, and within the scope not departing from the gist of the present disclosure, deformation of any component of the embodiments or omission of any component of the embodiments is possible.

[0014] Embodiment 1. FIG. 1 is a partial cross-sectional view showing the electric motor according to Embodiment 1. The electric motor 1 includes an electric motor main body 2, a rotating shaft 3, a terminal block 4, a cover 5, and a partition member 6. The rotating shaft 3 is rotatably provided in the electric motor main body 2.

[0015] The electric motor main body 2 includes a rotor 21, a stator 22, and a housing 23.

[0016] The rotating shaft 3 passes through the rotor 21. The rotor 21 is arranged coaxially with the rotating shaft 3. The rotor 21 is fixed to the rotating shaft 3.

[0017] The rotor 21 includes a rotor core 211 and a secondary conductor (not shown). The shape of the rotor core 211 is cylindrical. The rotor core 211 is formed by laminating a plurality of electromagnetic steel sheets in the axial direction of the rotating shaft 3. A plurality of slots (not shown) are formed in the rotor core 211 along the axial direction of the rotating shaft 3. A secondary conductor is arranged in each slot of the rotor core 211. The secondary conductor is formed by aluminum die casting.

[0018] The stator 22 surrounds the rotor 21. As a result, the stator 22 faces the outer peripheral portion of the rotor 21 with a gap therebetween. The stator 22 is fixed to the inner surface of the housing 23. The stator 22 is arranged coaxially with the rotating shaft 3.

[0019] The stator 22 has a stator core 221, a plurality of stator windings 222, and a plurality of winding frames 223. The shape of the stator core 221 is cylindrical. The stator core 221 is formed by laminating a plurality of electromagnetic steel sheets in the axial direction of the rotating shaft 3. The inner peripheral surface of the stator core 221 faces the outer peripheral surface of the rotor core 211 with a gap therebetween.

[0020] Each stator winding 222 is wound around the stator core 221 via a winding frame 223. In the present embodiment, the winding method of the stator winding 222 is concentrated winding. Note that the winding method of the stator winding 222 may be distributed winding.

[0021] Each winding frame 223 is made of a material having electrical insulation properties. In the present embodiment, each winding frame 223 is made of resin. Each stator winding 222 is electrically insulated from the stator core 221 by the winding frame 223.

[0022] Conductive pins 224 of each phase are arranged on the winding frame 223. The lead wires drawn from each stator winding 222 are electrically connected to the corresponding conductive pins 224 of each phase. The conductive pins 224 of each phase protrude from the stator 22 along the axial direction of the rotating shaft 3.

[0023] The housing 23 houses the rotor 21 and the stator 22. The rotating shaft 3 is rotatably supported by the housing 23. Thereby, the rotor 21 is rotatable with respect to the housing 23 integrally with the rotating shaft 3 about the axis of the rotating shaft 3.

[0024] The housing 23 has a frame 231 and a bracket 232. The frame 231 and the bracket 232 are joined to each other in a state facing each other in the axial direction of the rotating shaft 3.

[0025] The frame 231 has a frame cylindrical portion 231a, a frame end wall portion 231b, and a frame bearing housing portion 231c.

[0026] The shape of the frame cylindrical portion 231a is cylindrical. The axis of the frame cylindrical portion 231a coincides with the axis of the rotating shaft 3. In the present embodiment, the outer peripheral surface of the stator core 221 is press-fitted into the inner peripheral surface of the frame cylindrical portion 231a, whereby the stator 22 is fixed inside the frame 231. Of both ends of the frame cylindrical portion 231a in the axial direction of the rotating shaft 3, an opening 233 is formed at one end, and a frame end wall portion 231b is located at the other end.

[0027] The frame end wall portion 231b closes the other end of the frame cylindrical portion 231a. A frame through hole 234 is provided at the central portion of the frame end wall portion 231b. The rotating shaft 3 passes through the frame through hole 234.

[0028] The frame bearing housing portion 231c is a cylindrical protrusion provided on the frame end wall portion 231b surrounding the frame through hole 234. The frame bearing housing portion 231c protrudes from the frame end wall portion 231b toward the inside of the housing 23.

[0029] A bearing 235 through which the rotating shaft 3 passes is housed in the frame bearing housing portion 231c. The outer peripheral surface of the bearing 235 fits into the inner peripheral surface of the frame bearing housing portion 231c. The rotating shaft 3 is press-fitted into the bearing 235. Thereby, the rotating shaft 3 is rotatable with respect to the frame 231 via the bearing 235.

[0030] The bracket 232 has a bracket main body wall portion 232a and a bracket bearing housing portion 232b.

[0031] The bracket main body wall portion 232a is attached to the frame 231. The bracket main body wall portion 232a closes the opening 233 of the frame cylindrical portion 231a. A bracket through hole 236 is provided at the central portion of the bracket main body wall portion 232a. The rotating shaft 3 passes through the bracket through hole 236.

[0032] The bracket main body wall portion 232a is provided with a plurality of bracket pin through holes 237. The positions of the respective bracket pin through holes 237 correspond to the positions of the conductive pins 224 of the respective phases protruding from the stator 22. Each bracket pin through hole 237 is located outside the bracket through hole 236 in the radial direction of the bracket 232.

[0033] The bracket bearing housing portion 232b is a cylindrical protrusion provided on the bracket main body wall portion 232a surrounding the bracket through hole 236. The bracket bearing housing portion 232b protrudes from the bracket main body wall portion 232a toward the inside of the housing 23.

[0034] The bracket bearing housing portion 232b houses a bearing 238 through which the rotating shaft 3 passes. The outer peripheral surface of the bearing 238 fits into the inner peripheral surface of the bracket bearing housing portion 232b. The rotating shaft 3 is press-fitted into the bearing 238. Thereby, the rotating shaft 3 is rotatable with respect to the bracket 232 via the bearing 238.

[0035] Thereby, the rotating shaft 3 is rotatably supported by the housing 23 via the bearing 235 and the bearing 238.

[0036] The terminal block 4 is mounted on the motor main body 2 outside the motor main body 2. The terminal block 4 is attached to the bracket main body wall portion 232a. The terminal block 4 overlaps the bracket main body wall portion 232a in the axial direction of the rotating shaft 3. The terminal block 4 is made of a material having electrical insulation properties. In the present embodiment, the terminal block 4 is made of resin.

[0037] Here, FIG. 2 is a perspective view showing the terminal block 4 of FIG. 1. A terminal block through hole 41 is provided in the central portion of the terminal block 4. The rotating shaft 3 passes through the terminal block through hole 41.

[0038] The terminal block 4 is provided with a plurality of terminal block pin through holes 42. The positions of the respective terminal block pin through holes 42 correspond to the positions of the conductive pins 224 of each phase. Each terminal block pin through hole 42 is located outside the terminal block through hole 41 in the radial direction of the terminal block 4.

[0039] As shown in FIG. 1, the conductive pins 224 of each phase protruding from the stator 22 are sequentially passed through the corresponding bracket pin through holes 237 and the corresponding terminal block pin through holes 42. Power lead wires 43 corresponding to each phase are arranged on the terminal block 4. In the terminal block 4, the power lead wires 43 are electrically connected to the conductive pins 224 of each phase. Thereby, connection portions corresponding to each phase of the stator winding 222 are formed on the terminal block 4. Further, electrical components (not shown) are provided on the terminal block 4. Thereby, power lead wires 43, connection portions of each phase, electrical components, etc. are arranged as conductive portions on the terminal block 4.

[0040] The stator 22 generates a rotating magnetic field when an alternating current is supplied from the power lead wires 43 to the plurality of stator windings 222. In the present embodiment, a three-phase alternating current is supplied from the power lead wires 43 to the plurality of stator windings 222. The rotor 21 rotates integrally with the rotary shaft 3 with respect to the housing 23 due to the generation of the rotating magnetic field by the stator 22.

[0041] The cover 5 covers the terminal block 4 on the outside of the motor body 2. The cover 5 also covers the conductive portions arranged on the terminal block 4. Thereby, the terminal block 4 and the conductive portions arranged on the terminal block 4 are arranged inside the cover 5. The cover 5 is attached to the bracket 232 of the housing 23.

[0042] Here, FIG. 3 is a perspective view showing the cover 5 of FIG. 1. The cover 5 has a cover cylindrical portion 51 and a cover opposing portion 52.

[0043] The shape of the cover cylindrical portion 51 is cylindrical. The axis of the cover cylindrical portion 51 coincides with the axis of the rotating shaft 3. A notch portion 511 through which the power lead wire 43 passes is formed in the cover cylindrical portion 51 along the axial direction of the rotating shaft 3.

[0044] The cover opposing portion 52 is a plate-like portion that closes the end of the cover cylindrical portion 51. As shown in FIG. 1, the cover opposing portion 52 is provided at the end of the cover cylindrical portion 51 on the side far from the motor body 2 among both ends in the axial direction of the rotating shaft 3. The cover opposing portion 52 faces the bracket main body wall portion 232a of the housing 23 in the axial direction of the rotating shaft 3. Thereby, the terminal block 4 and the conductive portions arranged on the terminal block 4 are arranged between the cover opposing portion 52 and the bracket main body wall portion 232a.

[0045] A cover through hole 53 is provided at the central portion of the cover opposing portion 52. The rotating shaft 3 passes through the cover through hole 53.

[0046] The rotating shaft 3 protrudes from the inside of the housing 23 through the frame through hole 234 to the outside of the housing 23 in the axial direction of the rotating shaft 3. Further, the rotating shaft 3 protrudes from the inside of the housing 23 through the bracket through hole 236 and the cover through hole 53 in sequence to the outside of the cover 5 in the axial direction of the rotating shaft 3. That is, the motor 1 is a motor having a two-axis structure in which the rotating shaft 3 protrudes to the outside of the housing 23 on the frame 231 side of the motor body 2 and the rotating shaft 3 protrudes to the outside of the cover 5 on the bracket 232 side of the motor body 2.

[0047] Among the rotating shaft 3, the portion protruding to the outside of the housing 23 beyond the frame end wall portion 231b is defined as the frame-side protruding shaft portion 31. Also, among the rotating shaft 3, the portion protruding to the outside of the cover 5 beyond the cover opposing portion 52 is defined as the cover-side protruding shaft portion 32.

[0048] The partition member 6 is disposed inside the cover 5. Thereby, the partition member 6 is disposed between the cover opposing portion 52 and the bracket main body wall portion 232a.

[0049] Here, FIG. 4 is a perspective view showing the partition member 6 of FIG. 1. The shape of the partition member 6 is cylindrical. In the present embodiment, a cylindrical member is used as the partition member 6.

[0050] As shown in FIG. 1, the inner diameter of the partition member 6 is larger than the inner diameters of the cover through-hole 53 and the bracket through-hole 236, respectively. The outer diameter of the partition member 6 is smaller than the inner diameter of the terminal block through-hole 41. The partition member 6 is passed through the terminal block through-hole 41. The partition member 6 is arranged along the axial direction of the rotating shaft 3.

[0051] When looking at the partition member 6 along the axial direction of the rotating shaft 3, the rotating shaft 3 is passed through the inside of the partition member 6, and the terminal block 4 and the conductive portion are arranged outside the partition member 6. Also, when looking at the partition member 6 along the axial direction of the rotating shaft 3, the cover through-hole 53 and the bracket through-hole 236 are accommodated inside the partition member 6.

[0052] Of both end faces of the partition member 6 in the axial direction of the rotating shaft 3, one end face is the first end face 6a, and the other end face is the second end face 6b. The shapes of the first end face 6a and the second end face 6b are annular along the circumferential direction of the partition member 6.

[0053] The partition member 6 is in contact with each of the housing 23 and the cover opposing portion 52. The first end face 6a of the partition member 6 is in contact with the bracket main body wall portion 232a over the entire circumference of the partition member 6. The second end face 6b of the partition member 6 is in contact with the cover opposing portion 52 over the entire circumference of the partition member 6. Thereby, inside the cover 5, a first space 61 inside the cover partitioned by the partition member 6 and a second space 62 inside the cover are formed. The first space 61 inside the cover is a space formed inside the partition member 6. The second space 62 inside the cover is a space formed outside the partition member 6.

[0054] In the present embodiment, the partition member 6 is made of an elastic material. As the material constituting the partition member 6, rubber, resin, etc. are used. The partition member 6 is pressed against the bracket main body wall portion 232a of the housing 23 in the axial direction of the rotation shaft 3 by the cover facing portion 52. Thereby, the partition member 6 is held in an elastically deformed state between the cover facing portion 52 and the bracket main body wall portion 232a.

[0055] The first space 61 inside the cover is open to the outside of the cover 5 through the cover through hole 53. The rotation shaft 3 is disposed in the first space 61 inside the cover.

[0056] The second space 62 inside the cover is separated from the cover through hole 53 by the partition member 6. In the second space 62 inside the cover, a terminal block 4 and a conductive portion disposed on the terminal block 4 are provided.

[0057] The rotation shaft 3 is passed through the frame through hole 234. Therefore, in the electric motor 1, there is a possibility that foreign matters such as moisture and dust may enter from the outside of the housing 23 to the inside of the housing 23 through the gap between the outer peripheral surface of the rotation shaft 3 and the inner peripheral surface of the frame through hole 234. However, in the electric motor 1, the intrusion path of foreign matters passing through the gap between the outer peripheral surface of the rotation shaft 3 and the inner peripheral surface of the frame through hole 234 is blocked by the bearing 235. Thereby, the intrusion of foreign matters into the inside of the housing 23 is suppressed.

[0058] Further, the rotation shaft 3 is sequentially passed through the bracket through hole 236 and the cover through hole 53. Therefore, in the electric motor 1, there is a possibility that foreign matters such as moisture and dust may enter the inside of the cover 5 through the gap between the outer peripheral surface of the rotation shaft 3 and the inner peripheral surface of the cover through hole 53.

[0059] FIG. 5 is an enlarged view of a main part showing a path when foreign matter enters the inside of the cover 5 through a gap between the outer peripheral surface of the rotating shaft 3 in FIG. 1 and the inner peripheral surface of the cover through-hole 53. When foreign matter enters from the outside of the cover 5 to the inside of the cover 5 through the gap between the outer peripheral surface of the rotating shaft 3 and the inner peripheral surface of the cover through-hole 53, the foreign matter advances into the first space 61 inside the cover in the direction indicated by arrow A.

[0060] The foreign matter that has entered the first space 61 inside the cover may enter the inside of the housing 23 through the gap between the outer peripheral surface of the rotating shaft 3 and the inner peripheral surface of the bracket through-hole 236. However, in the electric motor 1, the intrusion path of foreign matter passing through the gap between the outer peripheral surface of the rotating shaft 3 and the inner peripheral surface of the bracket through-hole 236 is blocked by the bearing 238. Thereby, the intrusion of foreign matter into the inside of the housing 23 is suppressed.

[0061] On the other hand, the foreign matter that has entered the first space 61 inside the cover may reach the terminal block 4 disposed inside the cover 5. If the foreign matter reaches the terminal block 4, there is a risk of an electrical short circuit occurring between the conductive parts of each phase disposed on the terminal block 4.

[0062] However, in the electric motor 1, the terminal block 4 is disposed in the second space 62 inside the cover that is separated from the cover through-hole 53 by the partition member 6. Thereby, the intrusion of foreign matter from the first space 61 inside the cover to the second space 62 inside the cover is suppressed, and the foreign matter is suppressed from reaching the terminal block 4.

[0063] In such a motor 1, the rotating shaft 3 passes through the cover through-hole 53 of the cover facing portion 52 from the motor body 2 and protrudes to the outside of the cover 5. A partition member 6 is disposed inside the cover 5. When the partition member 6 is viewed along the axial direction of the rotating shaft 3, the cover through-hole 53 is accommodated inside the partition member 6, and the terminal block 4 is disposed outside the partition member 6. The partition member 6 is in contact with each of the housing 23 and the cover facing portion 52. Therefore, the partition member 6 can suppress foreign matter that has entered the inside of the cover 5 through the gap between the outer peripheral surface of the rotating shaft 3 and the inner peripheral surface of the cover through-hole 53 from reaching the terminal block 4. Thereby, it is possible to suppress the occurrence of problems such as electrical short circuits between the conductive portions of each phase disposed on the terminal block 4 due to foreign matter. Therefore, even when the motor 1 is disposed in a harsh environment such as a high humidity environment or a dusty environment, the occurrence of problems in the terminal block 4 can be suppressed. Thereby, the motor 1 can be made less likely to fail.

[0064] Further, the partition member 6 is made of an elastic material. The partition member 6 is pressed against the housing 23 in the axial direction of the rotating shaft 3 by the cover facing portion 52. Therefore, the partition member 6 can be brought into close contact with each of the housing 23 and the cover facing portion 52. Thereby, the gap between each of the housing 23 and the cover facing portion 52 and the partition member 6 can be more reliably eliminated. Therefore, it is possible to more reliably suppress foreign matter that has entered the inside of the cover 5 through the gap between the outer peripheral surface of the rotating shaft 3 and the inner peripheral surface of the cover through-hole 53 from reaching the terminal block 4. Thereby, the motor 1 can be made even more reliably less likely to fail.

[0065] Embodiment 2. FIG. 6 is a partial cross-sectional view showing a motor according to Embodiment 2. FIG. 7 is a perspective view showing the cover 5 of FIG. 6. The cover facing portion 52 has a cover inner wall portion 521, a cover outer wall portion 522, and a cover fitting portion 523.

[0066] The inner wall portion 521 of the cover is provided with a cover through hole 53. The outer wall portion 522 of the cover is disposed over the entire circumference of the cover cylindrical portion 51 outside the inner wall portion 521 in the radial direction of the cover 5. The inner wall portion 521 of the cover is located farther from the motor body 2 than the outer wall portion 522 in the axial direction of the rotation shaft 3.

[0067] The cover fitting portion 523 is a cylindrical wall portion that closes the space between the outer peripheral portion of the inner wall portion 521 of the cover and the inner peripheral portion of the outer wall portion 522 of the cover. The end portion of the partition member 6 is fitted into the cover fitting portion 523. In the present embodiment, the end portion of the partition member 6 is press-fitted into the cover fitting portion 523. As a result, the end portion of the partition member 6 is fitted into the cover fitting portion 523 in an elastically deformed state.

[0068] The inner peripheral surface of the cover fitting portion 523 is a fitting surface 524 into which the outer peripheral surface of the partition member 6 is fitted. The shape of the fitting surface 524 is a shape that conforms to the shape of the outer peripheral surface of the partition member 6. In the present embodiment, the fitting surface 524 is a cylindrical surface. As a result, the outer peripheral surface of the partition member 6 is fitted into the inner peripheral surface of the cover fitting portion 523 without a gap.

[0069] The second end surface 6b of the partition member 6 is in contact with the inner wall portion 521 of the cover. As a result, the second end surface 6b of the partition member 6 is in contact with the inner wall portion 521 over the entire circumference of the partition member 6. Other configurations are the same as those in the first embodiment.

[0070] In such a motor 1, the cover fitting portion 523 into which the end portion of the partition member 6 is fitted is included in the cover facing portion 52. Therefore, the cover fitting portion 523 can suppress the position of the partition member 6 from shifting with respect to the cover facing portion 52. As a result, for example, it is possible to suppress the partition member 6 from tilting and a part of the partition member 6 from separating from each of the housing 23 and the cover facing portion 52. Therefore, it is possible to more reliably suppress foreign matter that has entered the inside of the cover 5 through the gap between the outer peripheral surface of the rotation shaft 3 and the inner peripheral surface of the cover through hole 53 from reaching the terminal block 4. As a result, the motor 1 can be made more reliably less likely to fail.

[0071] Embodiment 3. FIG. 8 is a partial cross-sectional view showing a blower unit included in the ventilation fan according to Embodiment 3. The ventilation fan has a blower unit 10. The blower unit 10 has an electric motor 1, a first fan 11, and a second fan 13. The configuration of the electric motor 1 is the same as that in Embodiment 1.

[0072] The first fan 11 is attached to the frame-side protruding shaft portion 31 of the electric motor 1. The end portion of the frame-side protruding shaft portion 31 is a threaded portion. The first fan 11 is attached to the frame-side protruding shaft portion 31 by a nut 12 screwed onto the threaded portion of the frame-side protruding shaft portion 31.

[0073] The second fan 13 is attached to the cover-side protruding shaft portion 32 of the electric motor 1. The end portion of the cover-side protruding shaft portion 32 is a threaded portion. The second fan 13 is attached to the cover-side protruding shaft portion 32 by a nut 14 screwed onto the threaded portion of the cover-side protruding shaft portion 32. Accordingly, the first fan 11 and the second fan 13 are attached to the common rotating shaft 3.

[0074] The first fan 11 and the second fan 13 rotate integrally with the rotating shaft 3 with respect to the electric motor main body 2 by the generation of driving torque due to the supply of alternating current to the electric motor 1. Thereby, the first fan 11 and the second fan 13 rotate at the same rotational speed. When the first fan 11 and the second fan 13 rotate, wind is generated according to the rotational speeds of the first fan 11 and the second fan 13.

[0075] As described above, the blower unit 10 included in the ventilation fan has the electric motor 1. Therefore, even when the blower unit 10 is arranged in a harsh environment such as a high-humidity environment or an environment with a lot of dust, the electric motor 1 can be made less likely to fail, and the ventilation fan can be made less likely to fail.

[0076] Note that in Embodiment 3, the blower unit 10 has the electric motor 1 according to Embodiment 1. However, the blower unit 10 may have the electric motor 1 according to Embodiment 2.

[0077] Also, in Embodiment 3, the ventilation fan has the blower unit 10. However, for example, a blower used in an air conditioner or the like may have the blower unit 10. Also, a fan may have the blower unit 10. Furthermore, the blower unit 10 may be used in a device other than the ventilation fan, blower, and fan.

[0078] Also, in Embodiments 1 and 3, the cover facing portion 52 does not have a cover fitting portion. However, the cover facing portion 52 may have a cover fitting portion into which the end portion of the partition member 6 fits. In this case, in the cover facing portion 52, a cylindrical wall portion that protrudes from the wall around the cover through hole 53 toward the inside of the cover is provided as the cover fitting portion. Also, in this case, when the end portion of the partition member 6 is fitted into the cover fitting portion, the outer peripheral surface of the end portion of the partition member 6 may be fitted to the inner peripheral surface of the cover fitting portion, or the inner peripheral surface of the end portion of the partition member 6 may be fitted to the outer peripheral surface of the cover fitting portion. Even in this way, the cover fitting portion can suppress the position of the partition member 6 from shifting with respect to the cover facing portion 52. Thereby, the electric motor 1 and the blower unit 10 can be made even more reliable and less likely to fail.

[0079] Also, in each of the above embodiments, the shape of the partition member 6 is cylindrical. However, the shape of the partition member 6 is not limited to a cylindrical shape, and any cylindrical shape is acceptable. For example, the shape of the partition member 6 may be a cylindrical shape having a cross-section of a polygon such as a triangle or a quadrilateral.

[0080] Also, in each of the above embodiments, the partition member 6 is made of an elastic material. However, the material of the partition member 6 is not limited to an elastic material. For example, the partition member 6 may be made of ceramic or the like.

[0081] The configurations shown in the above embodiments are examples of the content of the present disclosure. The embodiments can be combined with other known technologies. It is possible to omit or change a part of the configuration of the embodiments without departing from the gist of the present disclosure.

[0082] Examples of aspects that can be included in the present disclosure are specified below as appendices. (Appendix 1) An electric motor body, A rotating shaft rotatably provided on the electric motor body, A terminal block mounted on the electric motor body outside the electric motor body, A cover covering the terminal block outside the electric motor body, A cylindrical partition member disposed inside the cover, and Comprising, The electric motor body has a rotor that rotates integrally with the rotating shaft, a stator that faces the outer peripheral portion of the rotor with a gap therebetween, and a housing that houses the rotor and the stator. The cover has a cover facing portion that faces the housing in the axial direction of the rotating shaft. A cover through hole is provided in the cover facing portion. The rotating shaft passes from the electric motor body through the cover through hole and protrudes outside the cover. When the partition member is viewed along the axial direction of the rotating shaft, the cover through hole is accommodated inside the partition member, and the terminal block is disposed outside the partition member. The partition member is an electric motor that is in contact with each of the housing and the cover facing portion. (Appendix 2) The partition member is made of an elastic material. The partition member is the electric motor according to Appendix 1, which is pressed against the housing in the axial direction of the rotating shaft by the cover facing portion. (Appendix 3) The motor according to appended claim 1 or appended claim 2, wherein the cover-facing portion has a cover fitting portion into which an end portion of the partition member is fitted. (Appended claim 4) An air ventilator comprising the motor according to any one of appended claims 1 to 3. (Appended claim 5) A blower comprising the motor according to any one of appended claims 1 to 3. (Appended claim 6) A fan comprising the motor according to any one of appended claims 1 to 3.

Explanation of reference numerals

[0083] 1 Motor, 2 Motor body, 3 Rotating shaft, 4 Terminal block, 5 Cover, 6 Partition member, 21 Rotor, 22 Stator, 23 Housing, 52 Cover-facing portion, 53 Cover through-hole, 523 Cover fitting portion.

Claims

1. An electric motor body, a rotating shaft rotatably provided on the electric motor body, a terminal block mounted on the electric motor body outside the electric motor body, a cover covering the terminal block outside the electric motor body, and a cylindrical partition member disposed inside the cover are provided. The electric motor body has a rotor that rotates integrally with the rotating shaft, a stator that faces the outer peripheral portion of the rotor with a gap therebetween, and a housing that houses the rotor and the stator. The cover has a cover facing portion that faces the housing in the axial direction of the rotating shaft. A cover through-hole is provided in the cover facing portion. The rotating shaft passes through the cover through-hole from the electric motor body and protrudes outside the cover. When the partition member is viewed along the axial direction of the rotating shaft, the cover through-hole is accommodated inside the partition member, and the terminal block is disposed outside the partition member. The partition member is in contact with each of the housing and the cover facing portion of the electric motor.

2. The partition member is made of an elastic material. The electric motor according to claim 1, wherein the partition member is pressed against the housing in the axial direction of the rotating shaft by the cover facing portion.

3. The electric motor according to claim 1 or claim 2, wherein the cover facing portion has a cover fitting portion into which an end portion of the partition member fits.

4. A ventilation fan including the electric motor according to claim 1 or claim 2.

5. A blower including the electric motor according to claim 1 or claim 2.

6. A fan including the electric motor according to claim 1 or claim 2.

Images