JP4095465B2 - Rotating motor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotary motor such as a motor, and more particularly to a rotary motor with a capacitor.
[0002]
[Prior art]
Conventionally, in a rotary motor with a capacitor, when the capacitor is provided outside the motor, complicated wiring work is required, and the size of a product such as a ventilation fan using the motor increases. Therefore, rotary motors with built-in capacitors have been developed with the aim of labor saving wiring work and compact products.
[0003]
For example, a motor with a capacitor in which a ring-shaped capacitor is provided outside the end portion in the central axis direction of a stator coil is disclosed (for example, see Patent Document 1).
[0004]
Further, a motor with a capacitor is disclosed in which a plurality of general capacitors are provided on a terminal block located on the end side in the central axis direction of the stator coil (see, for example, Patent Document 2).
[0005]
Moreover, a motor with a capacitor in which a film capacitor is arranged so as to be wound around the outer periphery of a stator is disclosed (for example, see Patent Document 3).
[0006]
[Patent Document 1]
Japanese Patent Laid-Open No. 7-231625 (page 3, FIG. 1-3)
[Patent Document 2]
JP 2001-131716 A (page 4-9, FIG. 1-7)
[Patent Document 3]
Japanese Utility Model Publication No. 5-80171 (first page, FIG. 1)
[0007]
[Problems to be solved by the invention]
As described above, when the ring-shaped capacitor is provided outside the end portion in the central axis direction of the stator coil, there is a problem that the dimension in the central axis direction of the motor becomes longer by at least the thickness of the capacitor.
[0008]
In addition, when a plurality of capacitors are provided on the terminal block, there is a limit to the capacitor capacity that can be obtained, and in order to secure the capacitor capacity without increasing the dimension in the central axis direction of the motor, This space is occupied by the capacitor, so there is a problem that a space for connecting the coil terminal, the lead of the thermal fuse, and the lead of the capacitor cannot be secured.
[0009]
Further, when the capacitor is arranged so as to be wound around the outer peripheral side of the stator, there is a problem that the outer diameter of the motor becomes large.
[0010]
It is an object of the present invention to provide a rotary electric motor such as a motor that can secure the capacity of a built-in capacitor without increasing the dimension in the central axis direction and the outer diameter.
[0011]
[Means for Solving the Problems]
A rotary motor according to the present invention includes a stator core including an annular yoke and a plurality of teeth protruding toward the inner peripheral side of the yoke;
A rotor that rotates coaxially with the center axis of the stator core in the stator core;
A coil mounted on the teeth via an insulating material;
In a rotary motor comprising a capacitor electrically connected to this coil,
The coil comprises a plurality of inner coils wound on the inner peripheral side of the teeth, and a plurality of outer coils wound so as to be disposed on both sides of the inner coil on the outer peripheral side of the teeth.
A ring-shaped space formed by the outer peripheral surface of the outer coil and the outer peripheral surface of the stator core is provided between the end surface in the central axis direction of the stator core and the end portion side of the central axis .
Upper Symbol capacitor crushing the capacitor winding is obtained by a flat and arc shape,
The capacitor is disposed in the space so as to face the plurality of inner coils .
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a cross-sectional view showing a rotary electric motor according to Embodiment 1 of the present invention, and FIGS. 2 and 3 are plan views of the upper frame as viewed from the central axis direction.
[0013]
As shown in FIG. 1, the rotary motor includes a stator core 1 fitted to the inner periphery of the upper frame 20 and the lower frame 9, a rotor 2 provided inside the stator core 1, a coil 6 of the stator core 1, A capacitor 15 electrically connected to the coil 6 and a resin terminal block 13 are provided.
[0014]
The rotor 2 is fixed to the shaft 7, and the shaft 7 is supported by bearings 10 installed on the upper frame 20 and the lower frame 9, respectively, and rotates in the stator core 1 coaxially with the central axis of the stator core 1.
[0015]
The coil 6 is wound around the teeth 4 of the stator core 1 via an annular bobbin 5 made of an insulating material.
[0016]
As shown in FIG. 3, the terminal block 13 is provided on the end side of the shaft 7, is mounted with the thermal fuse 11, the lead wire 12, etc., and is electrically connected to one end of the annular bobbin 5 to the terminal of the coil 6. It is fixed by inserting a hole 14 into the square pin 8.
[0017]
The stator core 1 is divided into an annular yoke 3 and a plurality of teeth 4. The plurality of teeth 4 are assembled by press-fitting at an equal interval in the circumferential direction of the annular bobbin 5, and after winding the coil 6, As shown in FIG. 2, the dovetail portion 22 of the tooth 4 is integrated with the yoke 3 by being fitted to the yoke 3.
[0018]
When the coil 6 is wound around the stator core 1 in which the yoke 3 and the teeth 4 are integrated, it is necessary to insert the coil 6 by an insert method, and the coil 6 may protrude from the yoke 3 side. In this embodiment, since the yoke 3 and the plurality of teeth 4 are divided, the coil 6 can be wound from the outer opening of the bobbin 5, and the coil 6 does not protrude to the yoke 3 side. It can be wound to fit in.
[0019]
As shown in FIG. 1, during the period from the end surface in the central axis direction of the yoke 3 to the end surface side of the central axis (between the end surface in the central axis direction of the yoke 3 and the vertical wall surface of the upper frame 20) Direction outer peripheral surface and the outer peripheral surface of the yoke 3 of the stator core 1 (the surface obtained by extending the outer peripheral surface of the yoke 3 toward the end surface side of the central axis, that is, the outer peripheral surface in the circumferential direction of the coil 6 and the inner peripheral wall surface of the upper frame 20). A ring-shaped space is formed, and the capacitor 15 is accommodated in the ring-shaped space.
[0020]
Capacitor 15 is a ring between the outer periphery of coil 6 and the inner wall of upper frame 20, by winding and laminating two dielectric films 16, such as polyethylene and polypropylene, on which a metal such as aluminum or zinc is vapor-deposited. It is molded into an arc-shaped capacitor (shown by a broken line) that enters the shape space.
[0021]
The capacitor 15 can have a large capacity by effectively using the ring-shaped space by forming an arc shape with an outer diameter along the inner wall of the upper frame 20 and an inner diameter along the outer periphery of the coil 6.
[0022]
For example, the deposited metal of the odd-numbered dielectric film is exposed on one end side surface of the molded capacitor, and the even-numbered layer deposited metal is exposed on the other end side surface. An electrode 18 is formed by spraying metal on both end faces of the arc-shaped capacitor, and a lead terminal 19 is connected to the electrode 18 by spot welding or the like.
[0023]
The capacitor to which the lead terminal 19 is connected is sealed with resin to form the insulating layer 17 and is adjusted to a size that fits just into the ring-shaped space between the coil 6 and the upper frame 20.
[0024]
As shown in FIG. 3, a plurality of capacitors (three in the figure) having an arc angle of 90 ° or less are installed avoiding the lead wires 12 drawn out of the upper frame 20, and lead terminals 19 of the capacitors 15. Are connected to the core wire exposed portion 21 of the lead wire 12 by spot welding or the like.
[0025]
In this embodiment, since the capacitor 15 is installed in a ring-shaped space between the coil 6 and the upper frame 20, the capacitor capacity is ensured without increasing the outer diameter and length of the rotary motor. The capacitor 15 can be built in.
[0026]
In addition, a sufficient work space for connecting the lead wires 12 and the lead terminals 19 in the terminal block 13 can be secured.
[0027]
Moreover, since it is divided into a plurality of capacitors 15, it can be installed avoiding interference with the lead wires 12 drawn to the outside of the upper frame 20, and the number of capacitors 15 according to the specifications of the rotary motor. Can be adapted to various specifications.
[0028]
Further, it is possible to cope with various specifications of the capacitor capacity by using a common resin-sealed mold and changing the thickness of the insulating layer 17 by the sealing resin.
[0029]
In general, when a capacitor 15 having a thin wall and a large arc angle is manufactured, the wound capacitor needs to be flattened and then arc-shaped. In addition, it is necessary to consider pressure support from the arc direction.
[0030]
In this embodiment, since the arc angle of the capacitor 15 is 90 ° or less, the wall thickness of the capacitor 15 / the outer diameter of the rotating motor (the outer diameter of the yoke) is 0.1 or less. Even if it exists, the arc-shaped capacitor | condenser 15 can be easily obtained by heat-pressing the wound capacitor | condenser.
[0031]
In addition, the capacitor 15 is obtained that has rigidity, no deformation after heat pressing, and little variation in performance.
[0032]
Furthermore, the capacitor 15 that can be installed so that there is no useless gap in the ring-shaped space between the coil 6 and the upper frame 20 is obtained.
[0033]
Similar to FIG. 6 shown in the third embodiment which will be described later, the same effect can be obtained even if the capacitor 15 is installed in the ring-shaped space on the lower frame 9 side.
[0034]
Embodiment 2. FIG.
4 is a plan view showing a rotary electric motor according to Embodiment 2 of the present invention. In the figure, the same reference numerals as those in Embodiment 1 denote the same or corresponding parts.
[0035]
As shown in FIG. 4, the capacitor 15 of this embodiment is formed in an arc shape in a space excluding the vicinity of the lead wire 12 drawn to the outside of the upper frame 20. 3 to the vertical wall surface of the upper frame 20.
[0036]
According to this embodiment, since the length of the capacitor 15 can be increased by forming it in an arc shape in the space excluding the vicinity of the lead wire 12, a large capacitor capacity can be secured and the number of assembly parts can be increased. Productivity improves because there are few.
[0037]
In particular, this embodiment is effective when producing a rotary electric motor having a specification with a limited capacitor capacity.
[0038]
Embodiment 3 FIG.
5 and 6 are sectional views showing a rotary electric motor according to Embodiment 3 of the present invention. In the figure, the same reference numerals as those in Embodiment 1 denote the same or corresponding parts.
[0039]
In the first and second embodiments, the case where the capacitor 15 is installed in the space extending from the end surface of the yoke 3 to the vertical wall surface (the inner wall surface on the terminal block 13 side) of the upper frame 20 has been described. In this embodiment, It is installed in the space below the lead wire 12 from the terminal block 13 from the yoke end surface.
[0040]
According to this embodiment, the space in the vicinity of the lead wire 12 drawn to the outside of the upper frame 20 can also be used effectively. For example, since the capacitor 15 can be formed in a ring shape, the capacitance of the capacitor is increased. be able to.
[0041]
Further, as shown in FIG. 6, the capacitor 15 may be installed in the space on the lower frame 9 side.
[0042]
Embodiment 4 FIG.
FIG. 7 is a plan view showing a rotary electric motor according to Embodiment 4 of the present invention, as seen from the stator core 1 side under the terminal block 13. In the figure, the same reference numerals as those in the first embodiment denote the same or corresponding parts.
[0043]
As shown in FIG. 7, the inner coil 6a is wound on the inner peripheral side of the 16 teeth 4, and the outer coil 6b is wound on the outer peripheral side of the tooth 4 so as to be positioned on both sides of the inner coil 6a. ing. The capacitor 15 is disposed in a ring-shaped space facing the inner coil 6a, and is located at a position shifted in the circumferential direction from the outer coil 6b.
[0044]
According to this embodiment, since the capacitor 15 is disposed at a position shifted from the outer coil 6b located on the outer peripheral side, the capacitor 15 is not easily affected by the coil heat generation of the outer coil 6b located at the nearest position. The capacitor performance deterioration due to the coil heat generation is suppressed.
[0045]
Further, the annular yoke 3 is provided with a notch 23 beside the groove into which the dovetail portion 22 of the tooth 4 is fitted, and a resin protrusion (not shown) that is lightly press-fitted into the notch 23 is provided on the capacitor 15. It is provided on the outer surface. Further, a resin pin 24 may be provided at the tip of the bobbin 5 and a hole member (not shown) for inserting the resin pin 24 may be provided on the outer surface of the capacitor 15.
[0046]
According to this embodiment, there is no need to provide a fixing means made of a strength member for fixing the capacitor 15 to the terminal block 13, and a work space for attaching the lead wires 12 and the like to the terminal block 13 is sufficiently secured. be able to.
[0047]
Further, since it is not necessary to make the outer peripheral shape of the insulating layer 17 of the capacitor 15 complicated in order to fix the capacitor 15 to the terminal block 13, the insulating layer is formed by dipping or integral molding with a thermoplastic resin. 17 can be formed.
[0048]
Embodiment 5. FIG.
FIG. 8 is a side view showing a capacitor according to Embodiment 5 of the present invention, and shows a state in which a plurality of capacitors are stacked. In the figure, the same reference numerals as those in the first embodiment denote the same or corresponding parts.
[0049]
In FIG. 8, each capacitor 15 is heat pressed so that the radius of curvature of the concave side 15a and the radius of curvature of the convex side 15b are approximately the same size.
[0050]
In this way, by setting the curvature radii of the concave side 15a and the convex side 15b to substantially the same size, there is almost no gap between the stacked capacitors in order to perform thermal spraying for electrode formation. The yield of the thermal spray material can be improved and the cost can be reduced.
[0051]
Further, the capacitor 15 can be stably stacked in the stock and material handling, and automation can be facilitated to improve productivity.
[0052]
【The invention's effect】
According to the rotary electric motor according to the present invention, a stator core comprising an annular yoke and a plurality of teeth protruding toward the inner peripheral side of the yoke;
A rotor that rotates coaxially with the center axis of the stator core in the stator core;
A coil mounted on the teeth via an insulating material;
In a rotary motor comprising a capacitor electrically connected to this coil,
The coil comprises a plurality of inner coils wound on the inner peripheral side of the teeth, and a plurality of outer coils wound so as to be disposed on both sides of the inner coil on the outer peripheral side of the teeth.
A ring-shaped space formed by the outer peripheral surface of the outer coil and the outer peripheral surface of the stator core is provided between the end surface in the central axis direction of the stator core and the end portion side of the central axis .
Upper Symbol capacitor crushing the capacitor winding is obtained by a flat and arc shape,
Since the capacitor is arranged in the space so as to face the plurality of inner coils, it is possible to incorporate a capacitor having a sufficient capacitance without increasing the outer diameter and the length in the central axis direction. At the same time, a rotary electric motor that is less affected by the coil heat generation of the outer coil and in which the capacitor performance deterioration due to the coil heat generation is suppressed can be obtained.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a rotary electric motor according to Embodiment 1 of the present invention.
FIG. 2 is a plan view showing a rotary electric motor according to Embodiment 1 of the present invention.
FIG. 3 is a plan view showing the rotary electric motor according to Embodiment 1 of the present invention.
FIG. 4 is a plan view showing a rotary electric motor according to a second embodiment of the present invention.
FIG. 5 is a sectional view showing a rotary electric motor according to Embodiment 3 of the present invention.
FIG. 6 is a sectional view showing a rotary electric motor according to Embodiment 3 of the present invention.
FIG. 7 is a plan view showing a rotary electric motor according to Embodiment 4 of the present invention.
FIG. 8 is a side view showing a capacitor according to a fifth embodiment of the present invention.
[Explanation of symbols]
1 stator core, 2 rotor core, 3 yoke, 4 teeth,
5 bobbins, 6 coils, 6a inner coils, 6b outer coils, 7 axes,
8 pin, 9 lower frame, 10 bearing, 11 thermal fuse,
12 lead wire, 13 terminal block, 14 holes, 15 capacitor, 15a concave side,
15b Convex side, 16 film, 17 insulating layer, 18 electrodes,
19 Lead terminal, 20 Upper frame, 21 Core wire exposed part,
22 Dovetail shaped part, 23 notch.

Claims (9)

A stator core comprising an annular yoke and a plurality of teeth protruding toward the inner periphery of the yoke;
A rotor that rotates coaxially with the center axis of the stator core in the stator core;
A coil mounted on the teeth via an insulating material;
In a rotary motor comprising a capacitor electrically connected to this coil,
The coil is composed of a plurality of inner coils wound on the inner peripheral side of the teeth, and a plurality of outer coils wound so as to be disposed on both sides of the inner coil on the outer peripheral side of the teeth.
A ring-shaped space formed by the outer peripheral surface of the outer coil and the outer peripheral surface of the stator core is provided between the end surface in the central axis direction of the stator core and the end side of the central axis .
Upper Symbol capacitor crushing the capacitor winding is obtained by a flat and arc shape,
The rotating electric machine according to claim 1, wherein the capacitor is disposed in the space so as to face the plurality of inner coils .   2. The rotary electric motor according to claim 1, wherein a lead wire is drawn out of the rotary electric motor, and the capacitor is disposed in a space excluding the space in the vicinity of the drawn lead wire.   A lead wire is drawn to the outside from the end side of the central axis of the rotary motor, and the capacitor has a length from the end surface in the central axis direction of the yoke to the lower surface near the lead wire. The rotary electric motor according to claim 1.   The rotary electric motor according to claim 1, wherein the stator core is formed by fitting the yoke and the teeth.   The rotary electric motor according to claim 1, wherein the capacitor is divided into a plurality of parts. The arc-shaped capacitor is characterized in that the ratio of the thickness of the capacitor to the outer diameter of the yoke is 0.1 or less, and the arc angle of the capacitor is 90 ° or less. The rotary electric motor according to 1. 2. The rotary electric motor according to claim 1 , wherein a notch is provided in an end surface of the yoke in the central axis direction, and the capacitor is attached to the notch . The rotary electric motor according to claim 1 , wherein the insulating material is a bobbin, the bobbin is provided with a protrusion, and the capacitor is attached to the protrusion . The rotary electric motor according to claim 1, wherein the arcuate concave and convex sides have substantially the same radius of curvature in the arcuate capacitor .

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