JP5235740B2 - Electric motor and ventilation blower using the same - Google Patents

Description

  The present invention relates to a capacitor-mounted electric motor, and more particularly to a capacitor-mounted induction motor. The present invention also relates to a ventilation fan using the same.

  Conventionally, for example, a capacitor-mounted induction motor having the following structure has been proposed. In other words, a capacitor-mounted induction motor is proposed in which a capacitor is arranged on the outer surface in the axial direction of the bracket constituting the outer shell on the anti-load side, and the winding end and the capacitor are connected on the terminal block arranged on the outer surface in the axial direction of the bracket. (For example, Patent Documents 1 and 2).

JP 2007-236021 A JP 2007-195326 A

  FIG. 23 is a top view of a terminal block showing a positional relationship between a capacitor and a plate-like terminal in a conventional capacitor-mounted induction motor. In the conventional condenser-mounted induction motor, the four arc-shaped plate-like terminals 27 (27a to 27d) are arranged so that their main surfaces are parallel to the mounting surface of the terminal block 11 (the main surface is the drive shaft 20). (Orthogonal) was placed flat.

  Thus, since the plate-like terminals 27a to 27d are installed in a plane so that one side of the terminal block 11 is in contact with the terminal block 11, the member cannot be sandwiched between the electrodes. When the pin terminal 10 is connected, it is necessary to perform soldering instead of welding, and it is also necessary to perform parallel spot welding even when the plate terminals 27a to 27d are joined to the lead wires. Furthermore, in the conventional terminal installation method, the amount of the plate-like terminals 27a to 27d protruding toward the inside of the plate-like terminals 27a to 27d with respect to the terminal block 11 is large. The size limit was large.

  The present invention has been made in view of the above, and the first object is to increase the area where the capacitor can be installed, and the second object is to connect the plate-like terminal and the lead wire or the like. Can be joined by easy spot welding.

  In order to solve the above-described problems and achieve the object, an electric motor according to the present invention includes a terminal block in which a capacitor is disposed on the outer surface in the axial direction of the bracket constituting the outer shell on the anti-load side and is disposed on the outer surface in the axial direction of the bracket. In the capacitor-mounted motor that electrically connects the winding end of the stator and the capacitor above, place the capacitor on the terminal block and connect the other end of the conductive pin terminal, one end of which is connected to the stator winding. The conductive pin terminal and the capacitor are electrically connected to each other by a flat plate-like terminal that is erected around the capacitor of the terminal block and arranged perpendicular to the mounting surface of the terminal block.

  According to the electric motor of the present invention, since the flat plate-like terminals are arranged perpendicular to the mounting surface of the terminal block, the occupied area of the plate-like terminals is reduced and the area where the capacitor can be installed is increased. In addition, since the plate-like terminal can be sandwiched between the welding electrodes, an effect is achieved in that the connection between the plate-like terminal and the lead wire can be joined by easy spot welding.

FIG. 1 is a cross-sectional view showing the internal structure of the capacitor-mounted induction motor according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view showing a state in which the electric motor main body and the terminal block are divided from the condenser-mounted induction motor. FIG. 3 is an electric circuit diagram of the main part of the condenser-mounted induction motor according to the first embodiment of the present invention. FIG. 4 is a perspective view showing the stator coil 5 inside the electric motor and the conductive pin terminal connected to the stator coil 5 extending in the axial direction. FIG. 5 is a perspective view showing a state in which the inner cover (insulator) 9 and the rear bracket 7 are attached to the intermediate assembly of FIG. FIG. 6 is a perspective view showing a state in which the conductive pin terminals are connected by the punch-out plate terminals from the terminal block of the capacitor-mounted induction motor according to the first embodiment of the present invention. FIG. 7 is a perspective view, partly in section, showing a state where a plate-like terminal is press-fitted into an insertion groove provided in a terminal block. FIG. 8 is a top view of the terminal block showing the positional relationship between the capacitor and the plate-like terminal. FIG. 9 is a perspective view, partly in section, showing another example of the plate-like terminal of the second embodiment. FIG. 10 is a perspective view showing a state where the plate-like terminal of Embodiment 3 is connected to the conductive pin terminal. FIG. 11 is a perspective view, partly in section, showing a state in which the terminal block of the fourth embodiment is provided with a retaining protrusion. 12 is a cross-sectional view of FIG. FIG. 13 is a perspective view showing another example of the plate-like terminal according to the fifth embodiment. FIG. 14 is a perspective view, partly in section, showing how the retaining protrusions engage with the engaging portions. FIG. 15 is a cross-sectional view of the fixing portion of FIG. FIG. 16 is a perspective view showing another example of the plate-like terminal according to the fifth embodiment. FIG. 17 is a perspective view, partly in section, showing the manner in which the retaining projection of the sixth embodiment engages with the engaging portion. 18 is a cross-sectional view of the fixing portion of FIG. FIG. 19 is a cross-sectional view showing another example of an engaging portion that engages with a retaining protrusion. FIG. 20 is a cross-sectional view showing still another example of the engaging portion that engages with the retaining protrusion. FIG. 21 is a front view of a ventilation fan equipped with the capacitor-mounted induction motor according to the above embodiment. FIG. 22 is a side view with a cross section of a part of the ventilation fan shown in FIG. FIG. 23 is a top view of a terminal block showing a positional relationship between a capacitor and a plate-like terminal in a conventional capacitor-mounted induction motor.

  DESCRIPTION OF EMBODIMENTS Embodiments of an electric motor according to the present invention and a ventilation blower using the same will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a cross-sectional view showing the internal structure of the capacitor-mounted induction motor according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view showing a state in which the electric motor main body and the terminal block are divided from the condenser-mounted induction motor. The condenser-mounted induction motor 100 includes an electric motor body 1 and a terminal block 11. This embodiment relates to these electrical connection methods. FIG. 2 shows a state where the electric motor body 1 and the terminal block 11 are divided.

  The electric motor body 1 includes a rotor 2 that passes through the drive shaft 20 at the center, a stator 3 that has a through hole that passes through the rotor 2 at the center, and a front bracket that houses the rotor 2 and the stator 3. 6 and a rear bracket 7. Among these, the stator 3 includes a stator core 4 in which a large number of thin steel plates are laminated, and a stator coil 5 wound around the teeth of the stator core 4 via a winding frame (insulator) 8. Has been.

  The rotor 2 is rotatably supported by two bearings 21 and 22. That is, the electric motor main body 1 includes a front bearing 21 and a rear bearing 21 in which outer rings are fitted and fixed in recesses formed in the center portions of the front bracket 6 and the rear bracket 7, and an inner ring is fitted and fixed to the drive shaft 20. Have. A minute gap is formed between the outer diameter of the rotor 2 and the inner diameter of the stator 3 so as to be uniform over the entire circumference. That is, the rotor 2 and the stator 3 are arranged with their axes aligned.

  On the other hand, the terminal block 11 is formed in an approximately circular shape and made of an insulating material such as a resin so as to cover the entire rear end portion of the rear bracket 7 (the projecting side of the drive shaft 20 is a front end portion). Various electrical components including the capacitor 13 are housed inside and covered with a cover 15.

  FIG. 3 is an electric circuit diagram of the main part of the condenser-mounted induction motor according to the first embodiment of the present invention. FIG. 4 is a perspective view showing the stator coil 5 inside the electric motor and the conductive pin terminal connected to the stator coil 5 extending in the axial direction. FIG. 5 is a perspective view showing a state in which the inner cover (insulator) 9 and the rear bracket 7 are attached to the intermediate assembly of FIG. FIG. 6 is a perspective view showing a state in which the conductive pin terminals are connected by the punch-out plate terminals from the terminal block of the capacitor-mounted induction motor according to the first embodiment of the present invention. FIG. 7 is a perspective view, partly in section, showing a state where a plate-like terminal is press-fitted into an insertion groove provided in a terminal block. FIG. 8 is a top view of the terminal block 11 showing the positional relationship between the capacitor 13 and the plate-like terminal 12.

  The conductive pin terminals 10 (10a to 10d) connected to the stator coil 5 housed in the outer shell of the electric motor composed of the front bracket 6 and the rear bracket 7 penetrate the rear bracket 7 and protrude to the outer surface of the electric motor. A terminal block 11 is attached to the rear outer surface of the rear bracket 7. The conductive pin terminals 10a to 10d further penetrate the terminal block 11 and are connected on the terminal block 11 by plate-like terminals 12 (12a to d).

  Specifically, the conductive pin terminal 10a that connects one end to the end of the first auxiliary coil 5a, the conductive pin terminal 10b that connects one end to the end of the first main coil 5b, and one end connected to the end of the second auxiliary coil 5c. The conductive pin terminal 10c and the conductive pin terminal 10d having one end connected to the end of the second main coil 5d penetrate the rear bracket 7 and stand upright from the outer peripheral portion of the terminal block 11 in parallel to the drive shaft 20. The conductive pin terminals 10 a to 10 d are erected on a predetermined circumference along the peripheral edge of the circular terminal block 11.

  Four long plate-like plate terminals 12 (12a to 12d) are arranged outside the standing conductive pin terminals 10a to 10d. The four plate terminals 12 (12a to 12d) are each shaped into an arc shape, and the plate surface (main surface) is parallel to the drive shaft 20 along the circumference where the conductive pin terminals 10a to 10d are erected. (The plate surface (main surface) is vertical to the mounting surface of the terminal block 11).

  The conductive pin terminal 10a connected to the first auxiliary coil 5a and the conductive pin terminal 10b connected to the first main coil 5b are connected by spot welding to the plate-like terminal 12a. In addition, the conductive pin terminal 10c connected to the second auxiliary coil 5c and the terminal 13a of the capacitor 13 are connected by spot welding to the plate-like terminal 12b. Further, the conductive pin terminal 10d connected to the second main coil 5d and the terminal 13b of the capacitor 13 are connected by spot welding to the plate-like terminal 12c, and a temperature fuse is connected between the plate-like terminal 12a and the plate-like terminal 12d. 14 is connected by spot welding. The plate-like terminals 12c and 12d are joined with lead wires and the like for joining with an external power supply device.

  The plate-like terminal 12 is formed by bending a flat plate material made of a conductive material in accordance with the shape of the insertion groove 16, and as shown in FIG. It is easy to press-fit, and press-fit into the insertion groove 16 provided in the terminal block 11 and fixed. The insertion groove 16 is shaped at a position where the plate-like terminal 12 and the conductive pin terminal 10 come into contact when the plate-like terminal 12 is installed.

  In the capacitor-mounted induction motor 100 having such a configuration, when the plate-like terminal 12 and the conductive pin terminal 10 are joined, both can be sandwiched between electrodes, so that the apparatus can be easily joined by simple spot welding. Can do.

  As described above, the plate-like terminals 12 are arranged with the plate surface (main surface) perpendicular to the mounting surface of the terminal block 11 (the plate surface (main surface) is parallel to the drive shaft 20). Compared with the conventional condenser-mounted induction motor shown in FIG. 23 in which the surface (main surface) is parallel to the mounting surface of the terminal block 11 (the plate surface (main surface) is orthogonal to the drive shaft 20) and placed flat. Thus, as shown in FIG. 8, the proportion of the area occupied by the plate-like terminal 12 inside the terminal block 11 is reduced, the capacitor installation space is increased, and the size of the capacitor 13 can be increased.

Embodiment 2. FIG.
FIG. 9 is a perspective view, partly in section, showing another example of a plate-like terminal. In the plate-like terminal 12A of the present embodiment, a barb protrusion 17 is provided at the edge of the plate-like terminal 12A on the attachment side to prevent it from coming off. By attaching the barb protrusion 17, it is possible to make it difficult for the barb protrusion 17 to come out of the insertion terminal block 11 which is difficult to insert into the insertion groove 16 when the plate-like terminal 12 </ b> A is press-fitted.

Embodiment 3 FIG.
FIG. 10 is a perspective view showing a state where the plate-like terminal 12 </ b> B is connected to the conductive pin terminal 10. In the plate-like terminal 12B of the present embodiment, the portion connected to the conductive pin terminal 10 has a smaller width than the other portions. As shown in FIG. 10, the width of the connecting portion with the conductive pin terminal 10 is made narrower than the other portions as shown in FIG. Welding in time is possible.

Embodiment 4 FIG.
FIG. 11 is a perspective view, partly in section, showing the terminal block 11 provided with a retaining projection. FIG. 12 is a sectional view thereof. The plate-like terminal 12 of this embodiment is locked by a retaining protrusion 18 having a claw 19. That is, a retaining projection 18 is provided that engages the claw 19 with the upper edge (engaged portion) of the terminal board 12 to restrict the movement of the terminal board 12 in the withdrawal direction.

Embodiment 5 FIG.
FIG. 13 is a perspective view showing another example of the plate-like terminal. FIG. 14 shows a state in which the notched terminal 12C is attached to the terminal block 11, and FIG. 15 is a sectional view of the fixing portion. The plate-like terminal 12 </ b> C is provided with a cutout (engaged portion) cut out from above. The retaining projection 18 has elasticity, and when the plate-like terminal 12C is press-fitted into the insertion groove 16, the retaining projection 18 escapes in the anti-groove direction, and when the plate-like terminal 12C completely fits in the insertion groove 16, it is elastic. The original state is restored by the force, and the claw 19 is engaged with the notch of the plate-like terminal 12C to prevent it from coming off. By forming the engaged portion in this way, the height of the retaining projection 18 can be lowered. Note that the engaged portion that engages with the retaining protrusion 18 can have substantially the same effect even if it is opened in the shape of a window provided in the plate-like terminal 12D shown in FIG.

Embodiment 6 FIG.
FIG. 17 is a perspective view, partly in section, showing how the retaining protrusions engage with the engaging portions. FIG. 18 is a cross-sectional view of the fixing portion. In the present embodiment, a tab-like barb protrusion 17 is formed on the terminal block side end of the plate-shaped terminal 12E, and a retaining protrusion 18 formed on the terminal block 11 is engaged therewith to thereby form the plate-shaped terminal 12E. Is fixed to the terminal block 11. The engaged portion provided on the plate-like terminal 12E may be formed by folding the lower end edge of the plate into a U-shape on the terminal block center side like the plate-like terminal 12F shown in FIG. As shown in the plate-shaped terminal 12G shown in FIG.

Embodiment 7 FIG.
FIG. 21 is a front view of a ventilation fan equipped with the capacitor-mounted induction motor according to the above embodiment. FIG. 22 is a side view with a cross section of a part of the ventilation fan shown in FIG. In the ventilation blower 200 of the present embodiment, the drive source that rotates the impeller 26 is configured by the condenser-mounted induction motor 100 having the configuration shown in the above embodiment. The condenser-mounted induction motor 100 is attached to a ventilation port formed in, for example, a wall portion or a ceiling portion that separates indoors and outdoors, and ventilates indoor air. The condenser-mounted induction motor 100 includes a casing (bell mouth) 25 that is attached to a ventilation port and forms a ventilation path (air channel) 24 therein, and is disposed in the casing 25 to allow air to flow through the ventilation path 24. And a fan that is forced to move. The blower includes a condenser-mounted induction motor 100 and an impeller 26 attached to a drive shaft of the capacitor-mounted induction motor 100. According to the ventilation blower 200 having such a configuration, the capacity of the condenser can be increased without increasing the size of the conventional outer shape, so that a larger air volume can be realized while maintaining the air path. it can.

  The electric motor according to the present invention is suitable for a condenser-mounted electric motor, and is particularly suitable for use in a condenser-mounted induction motor that is used in a ventilation fan and drives an impeller.

DESCRIPTION OF SYMBOLS 1 Electric motor main body 2 Rotor 3 Stator 4 Stator core 5 Stator coil 5a 1st auxiliary coil 5b 1st main coil 5c 2nd auxiliary coil 5d 2nd main coil 6 Front bracket 7 Rear bracket 8 Winding frame (insulator)
9 Inner cover (insulator)
10 (10a to d) Conductive pin terminal 11 Terminal block 12 (12a to d) Plate terminal 12A, 12B, 12C, 12D, 12E, 12F, 12G Plate terminal 13 Capacitor 14 Thermal fuse 15 Cover 16 Plate terminal insertion groove (Insertion groove)
17 Folding projection 18 Retaining prevention projection 19 Claw 20 Drive shaft 21 Front bearing 22 Rear bearing 24 Ventilation path 25 Casing 26 Impeller 27 Conventional terminal 100 Condenser mounted induction motor 200 Ventilation blower

Claims (9)

Capacitor mounted on the outer surface in the axial direction of the bracket that constitutes the outer shell on the anti-load side, and the capacitor is electrically connected to the winding end of the stator on the terminal block located on the outer surface in the axial direction of the bracket In the type of motor,
Placing the capacitor on the terminal block;
The other end of the conductive pin terminal, one end of which is connected to the winding of the stator, is erected around the capacitor of the terminal block,
Electrically connecting the conductive pin terminal and the capacitor with a flat plate-like terminal arranged perpendicular to the mounting surface of the terminal block ;
In the electric motor , the plate-like terminal has a width that is smaller than that of the other portion connected to the conductive pin terminal . The terminal block has a circular mounting surface;
The capacitor is disposed at the center of the mounting surface,
The conductive pin terminals are erected on a plurality of circumferences around the capacitor of the terminal block,
The electric motor according to claim 1, wherein the plate-like terminal is curved in an arc shape along the circumference of the conductive pin terminal so as to surround the capacitor. The electric motor according to claim 1, wherein the plate-like terminal is fixed by being press-fitted into an insertion groove formed in the terminal block.   4. The electric motor according to claim 3, wherein a barb protrusion is provided at a portion where the plate-like terminal is press-fitted, and the plate-like terminal is press-fitted and fixed into the insertion groove. 5. A retaining protrusion that further stands on the terminal block and engages with an engaged portion provided on the terminal board to restrict movement of the terminal board in the withdrawal direction. 5. The electric motor according to any one of the above. The electric motor according to claim 5 , wherein the engaged portion is a notch formed in an upper edge portion of the terminal board. The electric motor according to claim 5 , wherein the engaged portion is an opening formed on a plate surface of the terminal plate. The electric motor according to claim 5 , wherein the engaged portion is formed by bending a lower end edge portion of the terminal plate. A ventilation blower comprising the electric motor according to any one of claims 1 to 8 .

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