Electric motors, ventilation fans, blowers, and electric fans

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 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 on each of the frame and the bracket via a bearing. The rotating shaft protrudes outward from the frame through the through-hole of the frame inside the outer shell. 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 the end face of the bracket opposite to the frame. The terminal block is covered with a cover attached to the bracket. A pin protruding from the stator passes through 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 outside the frame. However, in the conventional electric motor disclosed in Patent Document 1, the rotating shaft does not protrude outside 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 the portion of the rotating shaft that protrudes outside the frame from the through-hole of the frame.

[0006] In ventilation fans and similar devices, electric motors with a dual-shaft structure, where the rotating shaft protrudes from both the frame and the cover, are sometimes used. When a dual-shaft electric motor is used in a ventilation fan or similar device, fans can be individually attached to the parts of the rotating shaft that protrude from the frame and the cover.

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

[0008] Because the terminal block, located inside the cover, is positioned outside the outer casing, there is a risk that pins with opposite poles on the terminal block could short-circuit electrically due to foreign objects entering the inside of the cover. Consequently, the motor becomes more prone to failure.

[0009] This disclosure aims to solve the above-mentioned problems and to provide electric motors, ventilation fans, blowers, and electric fans that are less prone to failure. [Means for solving the problem]

[0010] The electric motor according to this disclosure comprises an electric motor body, a rotating shaft rotatably mounted on the electric motor body, a terminal block mounted on the electric motor body on the outside of the electric motor body, a cover covering the terminal block on the outside of the electric motor body, and a cylindrical partition member disposed inside the cover. The electric motor body has a rotor that rotates integrally with the rotating shaft, a stator facing the outer circumference of the rotor with a gap in between, 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, and 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 to the outside of the cover. When the partition member is viewed along the axial direction of the rotating shaft, the cover through-hole is housed inside the partition member, and a terminal block is disposed outside the partition member. The partition member is in contact with the housing and the cover-facing portion, respectively. [Effects of the Invention]

[0011] According to this disclosure, electric motors, ventilation fans, blowers, and electric fans can be made less prone to failure. [Brief explanation of the drawing]

[0012] [Figure 1] This is a partial cross-sectional view showing an electric motor according to Embodiment 1. [Figure 2] Figure 1 is a perspective view showing the terminal block. [Figure 3] Figure 1 is a perspective view showing the cover. [Figure 4] This is a perspective view showing the partition member in Figure 1. [Figure 5] This is a close-up view of the key parts showing the path through which foreign matter enters the inside of the cover via the gap between the outer surface of the rotating shaft and the inner surface of the cover through-hole in Figure 1. [Figure 6] This is a partial cross-sectional view showing an electric motor according to Embodiment 2. [Figure 7] Figure 6 is a perspective view showing the cover. [Figure 8] This is a partial cross-sectional view showing the air blower unit included in the ventilation fan according to Embodiment 3.

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 simplified or omitted as appropriate. Note that the subject matter of the present disclosure is not limited to the following embodiments, and modifications of any component of the embodiments or omissions of any component of the embodiments are possible without departing from the spirit of the present disclosure.

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

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

[0016] The rotating shaft 3 penetrates 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 has 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 rotation 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 for 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 for each phase. The conductive pins 224 for each phase protrude from the stator 22 along the axial direction of the rotation shaft 3.

[0023] The housing 23 houses the rotor 21 and the stator 22. The rotation shaft 3 is rotatably supported by the housing 23. Thereby, the rotor 21 is rotatable with respect to the housing 23 integrally with the rotation shaft 3 about the axis of the rotation 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 rotation 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 rotation axis 3. In this embodiment, the stator 22 is fixed inside the frame 231 by press-fitting the outer circumferential surface of the stator core 221 into the inner circumferential surface of the frame cylindrical portion 231a. Of the two ends of the frame cylindrical portion 231a in the axial direction of the rotation axis 3, an opening 233 is formed at one end, and the 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 in the center 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 projection 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 into the inside of the housing 23.

[0029] The frame bearing housing 231c houses a bearing 235 through which a rotating shaft 3 passes. The outer surface of the bearing 235 fits into the inner surface of the frame bearing housing 231c. The rotating shaft 3 is press-fitted into the bearing 235. As a result, the rotating shaft 3 is rotatable relative to the frame 231 via the bearing 235.

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

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

[0032] Multiple bracket pin through holes 237 are provided in the bracket body wall 232a. The position of each bracket pin through hole 237 corresponds to the position of the conductive pins 224 of each phase protruding from the stator 22. Each bracket pin through hole 237 is located radially outward from the bracket through hole 236 of the bracket 232.

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

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

[0035] As a result, the rotating shaft 3 is rotatably supported in the housing 23 via bearings 235 and 238.

[0036] The terminal block 4 is mounted on the outside of the motor body 2. The terminal block 4 is attached to the bracket body wall 232a. The terminal block 4 overlaps the bracket body wall 232a in the axial direction of the rotating shaft 3. The terminal block 4 is made of an electrically insulating material. In this embodiment, the terminal block 4 is made of resin.

[0037] Here, Figure 2 is a perspective view showing the terminal block 4 of Figure 1. A terminal block through hole 41 is provided in the center 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 multiple terminal block pin through holes 42. The position of each terminal block pin through hole 42 corresponds to the position of the conductive pins 224 of each phase. Each terminal block pin through hole 42 is located radially outward from the terminal block through hole 41 of the terminal block 4.

[0039] As shown in Figure 1, the conductive pins 224 of each phase protruding from the stator 22 are sequentially passed through corresponding bracket pin holes 237 and corresponding terminal block pin holes 42. Power supply lead wires 43 corresponding to each phase are arranged on the terminal block 4. On the terminal block 4, the power supply lead wires 43 are electrically connected to the conductive pins 224 of each phase. As a result, the terminal block 4 has connection sections corresponding to each phase of the stator winding 222. In addition, electrical components not shown are provided on the terminal block 4. Thus, the power supply lead wires 43, the connection sections of each phase, and the electrical components are arranged as conductive parts on the terminal block 4.

[0040] The stator 22 generates a rotating magnetic field when alternating current is supplied from the power supply lead wires 43 to multiple stator windings 222. In this embodiment, three-phase alternating current is supplied from the power supply lead wires 43 to multiple stator windings 222. The rotor 21 rotates together with the rotating shaft 3 relative to the housing 23 due to the rotation magnetic field generated by the stator 22.

[0041] Cover 5 covers the terminal block 4 on the outside of the motor body 2. Cover 5 also covers the conductive parts located on the terminal block 4. As a result, the terminal block 4 and the conductive parts located on the terminal block 4 are located inside cover 5. Cover 5 is attached to the bracket 232 of the housing 23.

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

[0043] The cylindrical shape of the cover portion 51 is cylindrical. The axis of the cover portion 51 coincides with the axis of the rotation axis 3. A notch 511 for passing the power lead wire 43 is formed in the cover portion 51 along the axial direction of the rotation axis 3.

[0044] The cover opposing portion 52 is a plate-shaped portion that closes the end of the cover cylindrical portion 51. As shown in Figure 1, the cover opposing portion 52 is provided at the end of the cover cylindrical portion 51 that is furthest from the motor body 2, in the axial direction of the rotating shaft 3. The cover opposing portion 52 faces the bracket body wall portion 232a of the housing 23 in the axial direction of the rotating shaft 3. As a result, the terminal block 4 and the conductive parts arranged on the terminal block 4 are positioned between the cover opposing portion 52 and the bracket body wall portion 232a.

[0045] A cover through-hole 53 is provided in the center of the cover-facing 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. In addition, the rotating shaft 3 protrudes from the inside of the housing 23 in the axial direction of the rotating shaft 3, sequentially passing through the bracket through hole 236 and the cover through hole 53 to the outside of the cover 5. In other words, the electric motor 1 is a double-shaft electric motor in which the rotating shaft 3 protrudes to the outside of the housing 23 on the frame 231 side of the electric motor body 2, and the rotating shaft 3 protrudes to the outside of the cover 5 on the bracket 232 side of the electric motor body 2.

[0047] Of the rotating shaft 3, the portion that protrudes outward from the housing 23 beyond the frame end wall portion 231b is designated as the frame-side protruding shaft portion 31. Furthermore, the portion of the rotating shaft 3 that protrudes outward from the cover 5 beyond the cover-facing portion 52 is designated as the cover-side protruding shaft portion 32.

[0048] The partition member 6 is positioned inside the cover 5. As a result, the partition member 6 is positioned between the cover-facing portion 52 and the bracket body wall portion 232a.

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

[0050] As shown in Figure 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 passes through the terminal block through-hole 41. The partition member 6 is positioned along the axial direction of the rotation shaft 3.

[0051] When the partition member 6 is viewed along the axial direction of the rotating shaft 3, the rotating shaft 3 passes through the inside of the partition member 6, and the terminal block 4 and conductive parts are arranged on the outside of the partition member 6. Also, when the partition member 6 is viewed along the axial direction of the rotating shaft 3, the cover through hole 53 and the bracket through hole 236 are housed inside the partition member 6.

[0052] Of the two end faces of the partition member 6 in the axial direction of the rotation axis 3, one end face is the first end face 6a and the other end face is the second end face 6b. The shape of the first end face 6a and the second end face 6b is annular along the circumferential direction of the partition member 6.

[0053] The partition member 6 is in contact with both the housing 23 and the cover-facing portion 52. The first end face 6a of the partition member 6 is in contact with the bracket body wall portion 232a around its entire circumference. The second end face 6b of the partition member 6 is in contact with the cover-facing portion 52 around its entire circumference. As a result, a first space 61 and a second space 62 are formed inside the cover 5, separated by the partition member 6. The first space 61 is the space formed inside the partition member 6. The second space 62 is the space formed outside the partition member 6.

[0054] In this embodiment, the partition member 6 is made of an elastic material. Materials such as rubber and resin are used to constitute the partition member 6. The partition member 6 is pressed against the bracket body wall 232a of the housing 23 by the cover opposing portion 52 in the axial direction of the rotation axis 3. As a result, the partition member 6 is held in an elastically deformed state between the cover opposing portion 52 and the bracket body wall 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 rotating shaft 3 is located in the first space 61 inside the cover.

[0056] The second space 62 inside the cover is isolated from the cover through-hole 53 by a partition member 6. The second space 62 inside the cover is provided with a terminal block 4 and conductive parts located on the terminal block 4.

[0057] The rotating shaft 3 passes through the frame through-hole 234. Therefore, in the electric motor 1, there is a risk that foreign matter such as moisture and dust may enter the housing 23 from the outside to the inside through the gap between the outer surface of the rotating shaft 3 and the inner surface of the frame through-hole 234. However, in the electric motor 1, the entry path for foreign matter through the gap between the outer surface of the rotating shaft 3 and the inner surface of the frame through-hole 234 is blocked by the bearing 235. This prevents foreign matter from entering the inside of the housing 23.

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

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

[0060] Foreign matter that enters the first space 61 inside the cover may enter the inside of the housing 23 through the gap between the outer surface of the rotating shaft 3 and the inner surface of the bracket through hole 236. However, in the electric motor 1, the entry path for foreign matter through the gap between the outer surface of the rotating shaft 3 and the inner surface of the bracket through hole 236 is blocked by the bearing 238. This prevents foreign matter from entering the inside of the housing 23.

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

[0062] However, in the electric motor 1, the terminal block 4 is located in a second space 62 inside the cover, which is isolated from the cover through-hole 53 by a partition member 6. This prevents foreign matter from entering the second space 62 inside the cover from the first space 61 inside the cover, and prevents foreign matter from reaching the terminal block 4.

[0063] In this type of electric motor 1, the rotating shaft 3 is passed from the electric motor body 2 through a cover through-hole 53 in the cover-facing part 52 and protrudes to the outside of the cover 5. A partition member 6 is positioned 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 housed inside the partition member 6, and the terminal block 4 is positioned outside the partition member 6. The partition member 6 is in contact with both the housing 23 and the cover-facing part 52. Therefore, the partition member 6 can prevent foreign matter that enters the inside of the cover 5 through the gap between the outer surface of the rotating shaft 3 and the inner surface of the cover through-hole 53 from reaching the terminal block 4. This prevents malfunctions such as short circuits between conductive parts of each phase arranged on the terminal block 4 due to foreign matter. Consequently, even when the electric motor 1 is installed in adverse environments such as high humidity or dusty environments, malfunctions at the terminal block 4 can be suppressed. This makes the electric motor 1 less prone to failure.

[0064] Furthermore, 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 opposing portion 52. This allows the partition member 6 to be in close contact with both the housing 23 and the cover opposing portion 52. This further eliminates any gaps between the housing 23, the cover opposing portion 52, and the partition member 6. Consequently, it is possible to further reliably prevent foreign matter that has entered the inside of the cover 5 through the gap between the outer circumferential surface of the rotating shaft 3 and the inner circumferential surface of the cover through hole 53 from reaching the terminal block 4. This makes the electric motor 1 even less prone to failure.

[0065] Embodiment 2. Figure 6 is a partial cross-sectional view showing an electric motor according to Embodiment 2. Figure 7 is a perspective view showing the cover 5 of Figure 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 located outside the inner wall portion 521 of the cover 5 in the radial direction, and extends around the entire circumference of the cylindrical portion 51 of the cover. The inner wall portion 521 of the cover is located further from the motor body 2 than the outer wall portion 522 of the cover in the axial direction of the rotating shaft 3.

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

[0068] The inner circumferential surface of the cover fitting portion 523 is a fitting surface 524 into which the outer circumferential surface of the partition member 6 fits. The shape of the fitting surface 524 matches the shape of the outer circumferential surface of the partition member 6. In this embodiment, the fitting surface 524 is a cylindrical surface. As a result, the outer circumferential surface of the partition member 6 fits snugly into the inner circumferential surface of the cover fitting portion 523 without any gaps.

[0069] The second end face 6b of the partition member 6 is in contact with the inner wall portion 521 of the cover. As a result, the second end face 6b of the partition member 6 is in contact with the inner wall portion 521 of the cover around its entire circumference. The other configurations are the same as in Embodiment 1.

[0070] In this type of electric motor 1, the cover fitting portion 523 into which the end of the partition member 6 fits is included in the cover opposing portion 52. Therefore, the cover fitting portion 523 can prevent the position of the partition member 6 from shifting relative to the cover opposing portion 52. This prevents, for example, the partition member 6 from tilting and a part of the partition member 6 from separating from both the housing 23 and the cover opposing portion 52. Consequently, it is possible to more reliably prevent foreign matter that has entered the inside of the cover 5 through the gap between the outer circumferential surface of the rotating shaft 3 and the inner circumferential surface of the cover through hole 53 from reaching the terminal block 4. This makes the electric motor 1 even more reliable in preventing failure.

[0071] Embodiment 3. Figure 8 is a partial cross-sectional view showing a blower unit included in a 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 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 of the frame-side protruding shaft portion 31 is threaded. The first fan 11 is attached to the frame-side protruding shaft portion 31 by a nut 12 that is 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 of the cover-side protruding shaft portion 32 is threaded. The second fan 13 is attached to the cover-side protruding shaft portion 32 by a nut 14 that is screwed onto the threaded portion of the cover-side protruding shaft portion 32. Therefore, the first fan 11 and the second fan 13 are attached to a common rotating shaft 3.

[0074] The first fan 11 and the second fan 13 rotate together with the rotating shaft 3 relative to the motor body 2 due to the generation of driving torque by the supply of alternating current to the motor 1. As a result, 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 in proportion to the rotational speed of the first fan 11 and the second fan 13.

[0075] As described above, the blower unit 10 included in the ventilation fan has an electric motor 1. Therefore, even when the blower unit 10 is placed in a harsh environment such as a high-humidity environment or a dusty environment, the electric motor 1 is less likely to fail, and the ventilation fan is less likely to fail.

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

[0077] Furthermore, in Embodiment 3, the ventilation fan has the air blowing unit 10. However, a blower used in, for example, an air conditioner may also have the air blowing unit 10. Also, a fan may have the air blowing unit 10. Moreover, the air blowing unit 10 may be used in devices other than ventilation fans, blowers, and fans.

[0078] Furthermore, 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 of the partition member 6 fits. In this case, a cylindrical wall portion is provided in the cover-facing portion 52 that protrudes inward from the wall surrounding the cover through-hole 53 into the cover 5, and this protrusion serves as the cover-fitting portion. In this case, when the end of the partition member 6 is fitted into the cover-fitting portion, the outer circumferential surface of the end of the partition member 6 may fit into the inner circumferential surface of the cover-fitting portion, or the inner circumferential surface of the end of the partition member 6 may fit into the outer circumferential surface of the cover-fitting portion. Even in this way, the cover-fitting portion can prevent the position of the partition member 6 from shifting relative to the cover-facing portion 52. This makes it possible to make the electric motor 1 and the blower unit 10 even more reliable and less prone to failure.

[0079] Furthermore, in each of the above embodiments, the partition member 6 is cylindrical in shape. However, the shape of the partition member 6 is not limited to cylindrical; it can be any tubular shape. For example, the partition member 6 may be a tubular shape with a polygonal cross-section such as a triangle or a square.

[0080] Furthermore, 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 embodiments described above are merely examples of the content of this disclosure. The embodiments can be combined with other known technologies. Some parts of the configurations of the embodiments can be omitted or modified without departing from the gist of this disclosure.

[0082] Examples of aspects that may be included in this disclosure are listed below as an addendum. (Note 1) The electric motor body and A rotating shaft is rotatably mounted on the motor body, On the outside of the motor body, a terminal block mounted on the motor body, A cover that covers the terminal block on the outside of the motor body, A cylindrical partition member is positioned inside the cover. Equipped with, The motor body comprises a rotor that rotates integrally with the rotating shaft, a stator facing the outer circumference of the rotor with a gap in between, and a housing that accommodates the rotor and the stator. The cover has a cover-facing portion that faces the housing in the axial direction of the rotation shaft, The cover-facing portion is provided with a cover through-hole. The rotating shaft is passed through the cover through hole from the motor body and protrudes to the outside of the cover. When the partition member is viewed along the axial direction of the rotating shaft, the cover through-hole is housed inside the partition member, and the terminal block is positioned outside the partition member. The partition member is an electric motor that is in contact with the housing and the cover-facing portion, respectively. (Note 2) The partition member is made of an elastic material, The electric motor as described in Appendix 1, wherein the partition member is pressed against the housing in the axial direction of the rotating shaft by the cover-facing portion. (Note 3) The electric motor according to Appendix 1 or Appendix 2, wherein the cover-facing portion has a cover fitting portion into which the end of the partition member fits. (Note 4) A ventilation fan equipped with an electric motor as described in any one of the items from Appendix 1 to Appendix 3. (Note 5) A blower equipped with an electric motor as described in any one of the items from Appendix 1 to Appendix 3. (Note 6) A fan equipped with an electric motor as described in any one of the items from Appendix 1 to Appendix 3. [Explanation of symbols]

[0083] 1 Electric motor, 2 Electric motor body, 3 Rotating shaft, 4 Terminal block, 5 Cover, 6 Partition member, 21 Rotor, 22 Stator, 23 Housing, 52 Cover opposing part, 53 Cover through hole, 523 Cover fitting part.

Claims

1. The electric motor body and A rotating shaft is rotatably mounted on the motor body, On the outside of the motor body, a terminal block mounted on the motor body, A cover that covers the terminal block on the outside of the motor body, A cylindrical partition member is positioned inside the cover. Equipped with, The motor body comprises a rotor that rotates integrally with the rotating shaft, a stator facing the outer circumference of the rotor with a gap in between, and a housing that accommodates the rotor and the stator. The cover has a cover-facing portion that faces the housing in the axial direction of the rotation shaft, The cover-facing portion is provided with a cover through-hole. The rotating shaft is passed through the cover through hole from the motor body and protrudes to the outside of the cover. When the partition member is viewed along the axial direction of the rotating shaft, the cover through-hole is housed inside the partition member, and the terminal block is positioned outside the partition member. The partition member is in contact with the housing and the cover-facing portion, respectively. The partition member is made of an elastic material, The partition member is pressed against the housing by the cover-facing portion in the axial direction of the rotation shaft. The partition member is held in an elastically deformed state between the cover-facing portion and the housing of the electric motor.

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

3. Blower unit Equipped with, The aforementioned blower unit includes an electric motor, a first fan, and a second fan. The aforementioned electric motor is, The electric motor body and A rotating shaft is rotatably mounted on the motor body, On the outside of the motor body, a terminal block mounted on the motor body, A cover that covers the terminal block on the outside of the motor body, A cylindrical partition member is positioned inside the cover. It has, The motor body comprises a rotor that rotates integrally with the rotating shaft, a stator facing the outer circumference of the rotor with a gap in between, and a housing that accommodates the rotor and the stator. The cover has a cover-facing portion that faces the housing in the axial direction of the rotation shaft, The cover-facing portion is provided with a cover through-hole. The rotating shaft is passed through the cover through hole from the motor body and protrudes to the outside of the cover. When the partition member is viewed along the axial direction of the rotating shaft, the cover through-hole is housed inside the partition member, and the terminal block is positioned outside the partition member. The partition member is in contact with the housing and the cover-facing portion, respectively. Of the rotating shaft, the portion that protrudes outward from the cover beyond the portion facing the cover is designated as the cover-side protruding shaft portion, and the portion that protrudes outward from the housing on the side opposite to the portion facing the cover is designated as the frame-side protruding shaft portion. The first fan is attached to the frame-side protruding shaft portion, The second fan is a ventilation fan attached to the protruding shaft portion on the cover side.

4. Blower unit Equipped with, The aforementioned blower unit includes an electric motor, a first fan, and a second fan. The aforementioned electric motor is, The electric motor body and A rotating shaft is rotatably mounted on the motor body, On the outside of the motor body, a terminal block mounted on the motor body, A cover that covers the terminal block on the outside of the motor body, A cylindrical partition member is positioned inside the cover. It has, The motor body comprises a rotor that rotates integrally with the rotating shaft, a stator facing the outer circumference of the rotor with a gap in between, and a housing that accommodates the rotor and the stator. The cover has a cover-facing portion that faces the housing in the axial direction of the rotation shaft, The cover-facing portion is provided with a cover through-hole. The rotating shaft is passed through the cover through hole from the motor body and protrudes to the outside of the cover. When the partition member is viewed along the axial direction of the rotating shaft, the cover through-hole is housed inside the partition member, and the terminal block is positioned outside the partition member. The partition member is in contact with the housing and the cover-facing portion, respectively. Of the rotating shaft, the portion that protrudes outward from the cover beyond the portion facing the cover is designated as the cover-side protruding shaft portion, and the portion that protrudes outward from the housing on the side opposite to the portion facing the cover is designated as the frame-side protruding shaft portion. The first fan is attached to the frame-side protruding shaft portion, The second fan is a blower attached to the protruding shaft portion on the cover side.

5. Blower unit Equipped with, The aforementioned blower unit includes an electric motor, a first fan, and a second fan. The aforementioned electric motor is, The electric motor body and A rotating shaft is rotatably mounted on the motor body, On the outside of the motor body, a terminal block mounted on the motor body, A cover that covers the terminal block on the outside of the motor body, A cylindrical partition member is positioned inside the cover. It has, The motor body comprises a rotor that rotates integrally with the rotating shaft, a stator facing the outer circumference of the rotor with a gap in between, and a housing that accommodates the rotor and the stator. The cover has a cover-facing portion that faces the housing in the axial direction of the rotation shaft, The cover-facing portion is provided with a cover through-hole. The rotating shaft is passed through the cover through hole from the motor body and protrudes to the outside of the cover. When the partition member is viewed along the axial direction of the rotating shaft, the cover through-hole is housed inside the partition member, and the terminal block is positioned outside the partition member. The partition member is in contact with the housing and the cover-facing portion, respectively. Of the rotating shaft, the portion that protrudes outward from the cover beyond the portion facing the cover is designated as the cover-side protruding shaft portion, and the portion that protrudes outward from the housing on the side opposite to the portion facing the cover is designated as the frame-side protruding shaft portion. The first fan is attached to the frame-side protruding shaft portion, The second fan is a fan attached to the protruding shaft portion on the cover side.

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