KR20190111113A - motor - Google Patents

Abstract

A rotor, a stator, a resin casing for sealing at least an insulator and a winding of the stator, a plurality of bearings for rotatably supporting the rotating shaft at positions apart from each other in the axial direction, a cover for covering the outer circumferential surface of the resin casing, and conductivity And a stator having a plurality of bearing accommodation members each having a plurality of bearings housed therein, the energizing member being supported by a cover, the energizing member having a contact portion in contact with the stator core on one side, and the other side. A motor having a grounding portion grounded to the ground, wherein the bearing and the conducting member are electrically insulated from each other.

Description

motor

The present invention relates to a motor.

In recent years, motors driven by a pulse width modulation (PWM) method (hereinafter referred to as a PWM method) have been increasing. When the motor is driven by the PWM method, there is a case where a potential difference (hereinafter referred to as an axial voltage) occurs between the outer ring and the inner ring of the bearing without the neutral point potential of the winding being zero. When the axial voltage reaches a constant voltage, electric current flows inside the bearings, causing electrical corrosion inside the bearings. Electroforming of bearings may cause vibration or noise. Then, the motor which suppressed generation | occurrence | production of an axial voltage is disclosed by patent document 1, for example.

The motor described in Patent Literature 1 includes a stator in which a fixing member including a stator iron core wound around a winding is molded with an insulating resin, a rotor arranged against the stator around the shaft, and a bearing rotatably supporting the shaft. And a drive circuit board on which a bracket for fixing the bearing and a drive circuit for driving the windings are mounted. The iron core connecting terminal is connected to the stator iron core, and the iron core connecting terminal is inserted into the driving circuit board to electrically connect the stator iron core and the ground which is the zero potential reference on the driving circuit board.

The stator core is considered to be a voltage source that induces high frequency voltage in the bearing inner ring and the outer ring of the bearing when the switching element for driving the motor is driven. The voltage is reduced.

International Publication No. 2010/067614

In the motor described in Patent Literature 1, since the conductive member is brought into contact with the stator core, the conductive member is connected to the driving circuit board. Thus, the motor is also required for the motor that does not require the driving circuit. In addition, since the conductive member is filled in the mold resin, it is necessary to shape the conductive member so that the conductive member does not shift or be deformed during molding of the mold resin.

In addition, the mold resin holds the conductive member, and an external force acts on the conductive member so that the mold resin is cracked, or a gap is formed between the conductive member and the mold resin. As a result, external moisture easily penetrates into the inside of the mold resin, or the conductive member and the stator iron core do not come into contact with each other, so that the effect of the countermeasure against the electrolysis cannot be obtained.

Therefore, an object of the present invention is to provide a motor capable of protecting against external shock and counteracting of bearing while suppressing an increase in the number of parts.

An exemplary motor of the present invention is a stator having a rotor having a rotation axis extending along a central axis, a stator having a plurality of windings wound through an insulator on a stator core facing radially opposite to the outer circumferential surface of the rotor, and at least the stator. A resin casing for sealing the insulator and the winding, a plurality of bearings rotatably supporting the rotating shaft at positions spaced apart from each other in the axial direction, a cover covering the outer circumferential surface of the resin casing, and an electrically conductive member The stator includes a plurality of bearing accommodation members each containing the plurality of bearings, the energization member is supported by the cover, and the energization member is in contact with the stator core on one side and the other side. A grounding portion grounded to the ground, wherein the bearing and the conductive member are electrically insulated from each other. It is characterized by.

(Effects of the Invention)

According to the exemplary motor of the present invention, it is possible to provide a motor capable of countermeasure of bearings while suppressing an increase in the number of parts.

1 is an exploded perspective view of an example of a motor according to the present invention.
2 is a cross-sectional view of the motor shown in FIG. 1.
3 is a perspective view of a stator core.
4 is a perspective view of a stator core provided in the stator.
5 is a perspective view of the rotor.
6 is a partial cross-sectional view showing a resin casing and a cover of a modification of the motor according to the first embodiment.
7 is a partial cross-sectional view showing a resin casing and a cover of another modification of the motor according to the first embodiment.
8 is an exploded perspective view of another example of a motor according to the present invention.
9 is a cross-sectional view of the motor shown in FIG. 8.
10 is a cross-sectional view of another example of a motor according to the present invention.
11 is an exploded perspective view of yet another example of a motor according to the present invention.
12 is a cross-sectional view of the motor shown in FIG. 11.
It is sectional drawing of the modification of the motor which concerns on 4th embodiment.
14 is a sectional view of another example of a motor according to the present invention.

Exemplary embodiments of the present invention will be described below with reference to the drawings.

<1. First embodiment>

1 is an exploded perspective view of an example of a motor according to the present invention. 2 is a cross-sectional view of the motor shown in FIG. 1. In the following description, the direction in which the central axis Ax extends, that is, the left and right directions in FIG. 2 is taken as the axial direction. Moreover, the direction orthogonal to an axial direction is made into radial direction, and the tangential direction of the circle centered on an axis is made into the circumferential direction.

In this document, the axial direction is set as follows with reference to FIG. 2. That is, in FIG. 2, the direction toward the right in the axial direction is called the first direction Op, and the direction toward the left is called the second direction Or. In addition, "left direction" and "right direction" in this book are set for description. Therefore, these directions do not limit the directions when the motor A is actually used.

<1.1 Motor Configuration>

As shown in FIG. 1, the motor A according to the present embodiment includes a stator 1, a resin casing 2, a cover 3, a rotor 4, a first bearing 51, It has a 2nd bearing 52 and the electricity supply member 8. The resin casing 2 covers the outer circumferential surface of the stator 1. That is, the motor A is what is called a mold motor which sealed the stator 1 with the resin casing 2. The rotor 4 is disposed inside the stator 1. The rotor 4 has a rotating shaft 40 extending along the central axis Ax. The rotating shaft 40 is supported by the first bearing 51 and the second bearing 52, and is rotatable with respect to the stator 1. That is, the motor A which concerns on this embodiment is an inner rotor type DC brushless motor in which the rotor 4 rotates inside the stator 1. The plurality of bearings 51 and 52 rotatably support the rotating shaft 40 at positions spaced apart from each other in the axial direction.

<1.2 Stator Configuration>

The stator 1 will be described with reference to the new drawings. 3 is a perspective view of a stator core. 4 is a perspective view of a stator core provided in the stator. 3 and 4, the stator 1 includes a stator core 11, an insulator 12, and a winding 13. The stator 1 has a plurality of windings 13 wound on the stator core 11 facing the outer circumferential surface of the rotor 4 in the radial direction via the insulator 12. Moreover, the stator 1 is equipped with the 1st bearing accommodating member 61 in which the 1st bearing 51 is accommodated, and the 2nd bearing accommodating member 62 in which the 2nd bearing 52 is accommodated. That is, the stator 1 is provided with the some bearing accommodating member 61, 62 in which the some bearing 51, 52 is accommodated, respectively.

The stator core 11 is conductive. As shown in FIG. 4, the stator core 11 is provided with the annular core back part 111 and the tooth part 112. As shown in FIG. The core back portion 111 is annular extending in the axial direction. The tooth portion 112 protrudes inward from the inner circumferential surface of the core back portion 111 in the radial direction. As shown in FIG. 4, the stator core 11 includes twelve teeth portions 112. The teeth portions 112 are arranged at equal intervals in the circumferential direction. That is, in the motor A of this embodiment, the stator 1 is 12 slots.

The insulator 12 covers the stator 11. The insulator 12 is a molded body of resin. The insulator 12 covers the entirety of the tooth portion 112 and covers both end surfaces of the core back portion 111 in the axial direction. The insulator 12 has an insulator tooth part 121 covering the tooth part 112 and an insulator core bag part 122 covering at least an axial end of the core bag part 111. The winding 13 is formed by winding a conducting wire in a tooth portion 112 (insulator tooth portion 121) covered with the insulator 12. The stator core 11 and the winding 13 are insulated by the insulator 12. In addition, in this embodiment, although the insulator 12 is a molded object of resin, it is not limited to this. The structure which can insulate the stator core 11 and the winding 13 can be employ | adopted widely.

As described above, the insulator 12 insulates the stator core 11 and the winding 13. Therefore, the outer peripheral surface of the core back part 111 in the radial direction in the stator core 11 may be exposed without covering with the insulator 12. The stator core 11 may have a structure in which electromagnetic steel sheets are laminated, or may be a single member such as firing or casting powder. In addition, the stator core 11 may be a structure which can be divided | segmented into the division core containing one tooth part 112, and the structure formed by winding the strip | belt-shaped member may be sufficient.

The winding 13 is disposed in each of the teeth portions 112 of the stator core 11. That is, in the motor A, twelve windings 13 are arranged. The twelve windings 13 provided in the stator 1 are divided into three systems (hereinafter referred to as three phases) in accordance with the timing at which the current is supplied. These three phases are called U phase, V phase, and W phase, respectively. That is, the stator 1 has four U-phase windings, four V-phase windings and four W-phase windings. In addition, in the following description, the winding of each phase is put together and it demonstrates only as winding 13. As shown in FIG.

The stator 1 is connected to a plurality of windings 13 or electrically connected to a control circuit (not shown) mounted on the substrate Bd provided in the winding 13 and the motor A. FIG. The crossover part 131 is provided. The crossover part 131 is disposed in the wiring part 120 provided in the insulator core bag part 122 covering the axial end surface of the core bag part 111 of the insulator 12. As shown in FIG. 2, the stator 1 includes a crossover 131 disposed on a radially outer surface of the insulator 12 that covers the end surface of the core back portion 111 in the first direction Op. The wiring part 120 is provided.

<1.3 Composition of Resin Casing and Cover>

As shown to FIG. 1, FIG. 2 etc., the resin casing 2 is cylindrical shape. The resin casing 2 is a mold molded body of resin in which the stator core 11 is sealed inside. That is, the resin casing 2 seals at least the insulator 13 and the winding 12 of the stator 1. In addition, as shown in FIG. 2, the motor A also covers the outer surface in the radial direction of the stator core 11. The resin casing 2 has a bottomed cylindrical shape in which at least a part of the end portion in the first direction Op is closed. And the resin casing hole 20 extended in the axial direction at the radial center part of a bottom part is formed.

In the radially outer side of the resin casing hole 20 on the end surface of the bottom side in the first direction Op, the concave hole 21 is formed in the axial direction. The rotating shaft 40 attached to the rotor 4 penetrates the resin casing hole 20 in the axial direction. In addition, the first bearing accommodation member 61 is fixed to the resin casing hole 20 by insert molding. In addition, the detail of the 1st bearing accommodation part 61 is mentioned later.

As shown in FIG. 1, FIG. 2, etc., the cover 3 covers the outer peripheral surface of the resin casing 2. As shown in FIG. The cover 3 is cylindrical with a bottom with at least a part of the end of the first direction Op closed. That is, the cover 3 is cylindrical in shape extending in the axial direction. The cover 3 is formed by extruding a metal plate, for example. And the cover hole 30 which penetrates in the axial direction is provided in the radial direction center part of the bottom part of the cover 3. And the casing contact part 31 which protruded in the axial direction inner side (FIG. 2 side Or side) is provided in the radial direction outer side of the cover hole 30. As shown in FIG. That is, the cover 3 is provided with the casing contact part 31 which intruded inward in the radial direction center part of the bottom part, and the cover hole 30 is provided in the center of the casing contact part 31. As shown in FIG.

The resin casing 2 inserts the first direction Op side in FIG. 2 into the cover 3. And the press-fit part 22 mentioned later is press-fitted into the cover 3. When the resin casing 2 is press-fitted into the cover 3, the casing contact portion 31 overlaps the concave hole 21 in the axial direction. In addition, the resin casing hole 20 and the cover hole 30 also overlap in the axial direction. The rotating shaft 40 penetrates the resin casing hole 20 and the cover hole 30.

Moreover, when the resin casing 2 is press-fitted into the cover 3, the casing contact part 31 contacts with the recessed hole 21. As shown in FIG. The casing contact portion 31 presses the concave hole 21 so that the resin casing 2 and the cover 3 come into close contact with each other. As a result, the entry of gas, water, dust, dust, and the like from the boundary between the resin casing hole 20 and the cover hole 30 from the boundary between the resin casing 2 and the cover 3 is suppressed.

Next, attachment of the resin casing 2 to the cover 3 will be described. The resin casing 2 is provided with the press-fit part 22 and the recessed part 23 in the radial outer peripheral surface. That is, the resin casing 2 is provided with the press-fit part 22 press-fitted in the inside of the cover 3. As shown in FIG. 2, the press-fit part 22 is provided in the part which overlaps with the stator core 11 of the outer peripheral surface of the resin casing 2 in radial direction. That is, the press-fit part 22 overlaps the stator core 22 by viewing the resin casing 2 in the radial direction. The resin casing 2 is inserted into the opening of the cover 3 from the end of the side where the recess 23 is formed. Thereafter, the resin casing 2 is fixed to the cover 3 by press fitting.

That is, the resin casing 2 is press-fitted into the inner peripheral surface of the cover 3 in the press-fit part 22. The press-fit portion 22 is provided at a position overlapping the stator core 11 in the radial direction. At the time of press-in, a force acts on the resin casing 2 from the cover 3 in the radial direction and the axial direction. Since the press-in part 22 is provided in the position which overlaps in the radial direction with the stator core 11 which is higher in strength than resin of the resin casing 2, even if a force acts from the cover 3 at the time of press-in, It is difficult to cause deformation.

The recessed part 23 overlaps in the radial direction with the wiring part 120 in which the crossover part 131 of the insulator 12 of the outer peripheral surface of the resin casing 2 is arrange | positioned. The recessed part 23 is formed in the edge part of the side of the 1st direction Op of the resin casing 2, and is formed continuously in the circumferential direction. In this embodiment, although formed in the radial direction edge part of the resin casing 2, it is not limited to this.

In addition, depending on the conditions of the place where the motor A is attached, water contained in the air inside the motor A may be condensed and condensation water may be high. Air is also accumulated in the recess 23, and moisture contained in the accumulated air may condense. Thus, the outer circumferential surface of the resin casing 2 is provided with a concave groove 200 extending from the concave portion 23 toward the second direction Or.

As a result, the condensation water accumulated on the recess 23 is discharged from the space between the second bearing accommodation member 62 and the cover 3 through the recess 200. For example, the concave groove 200 may be omitted in the case where the electrical circuit is insulated and the condensation water is not affected or difficult to receive. Even if the concave groove 200 is omitted, the condensation water is evaporated into the air of the concave portion 23 by the heat during the driving of the motor A. In addition, when the condensation water cannot be drained to the outside of the resin casing due to the shape of the cover, a drain hole penetrating to the outside may be formed in the cover or the bearing accommodation member, and the drain water may be drained using the drain hole.

The resin casing 2 is inserted into the cover 3 from the side in which the recess 23 is formed in the axial direction and fixed by press fitting. When the resin casing 2 is press-fitted into the cover 3, the gap Gp is formed in the radial direction between the portion where the recess 23 is formed and the inner surface of the cover 3. In addition, the detail of the clearance gap G of the resin casing 2 and the cover 3 is mentioned later.

In addition, as shown in FIG. 2, the thickness of the radial direction of the part provided with the recessed part 23 of the resin casing 2 is thinner than the thickness of the other part of the resin casing 2. As shown in FIG. That is, the part in which the recessed part 23 is formed is the thin part 24 which is thinner than another part. A current flows in the crossover portion 131, so that the crossover portion 131 is heated. At this time, since the thin portion 24 is formed, heat of the crossover portion 131 is likely to be discharged to the outside of the resin casing 2.

<1.4 Rotor Configuration>

5 is a perspective view of the rotor. As shown in FIG. 5, the rotor 4 includes a rotor core 41, a plurality of magnets 42, and a mold part 43. The rotor core 41 includes a cylindrical member 411 extending in the axial direction and an axial support member 412 disposed in the radially inner side of the cylindrical member. The cylindrical member 411 and the axial support member 412 are mutually fixed by the mold part 43 which is a mold molding of resin. The rotor core 41 is a magnetic body. The rotor core 41 may be a laminate in which magnetic plates are laminated in the radial direction, or may be, for example, a molded body formed by sintering powder to form the same member.

The rotating shaft 40 is cylindrical. The rotating shaft 40 penetrates through the radial center of the shaft supporting member 412 of the rotor core 41. The rotation shaft 40 and the shaft support member 412 are relatively fixed. Moreover, although press fitting, welding, etc. are mentioned as a fixing method, it is not limited to this. The method which can fix the rotating shaft 40 and the axial support member 412 can be employ | adopted widely. That is, the rotation shaft 40 is fixed to the rotor 4, and the rotation shaft 40 rotates about the center axis Ax by rotating the rotor 4.

The plurality of magnets 42 are disposed radially outward of the rotor core 41. In the rotor 4 of the present embodiment, the plurality of magnets 42 are arranged side by side in the circumferential direction. For example, the rotor core 41 has eight magnets 42. In addition, in this embodiment, although the some magnet 42 was lined up, it is not limited to this. For example, a magnet obtained by alternately magnetizing the N pole and the S pole in the circumferential direction with respect to the cylindrical magnetic body may be used.

That is, in the rotor core 41, the north pole and the south pole are used as a pair of magnetic poles, and one pair of magnetic poles is provided. The magnet 42 is fixed to the rotor core 41 by, for example, a mold of resin. In addition, the fixing method of the magnet 42 is not limited to the mold of resin, The method which does not adversely affect or is difficult to give the rotation of the rotor 4, such as a bonding, welding, and a mechanical fixing method, is employ | adopted.

<1.5 Bearing Structure>

The rotary shaft 40 is press-fitted into the 1st bearing 51 and the 2nd bearing 52 in two places separated in the axial direction. That is, the rotation shaft 40 is rotatably supported at two different places in the axial direction by the first bearing 51 and the second bearing 52. The end part of the 2nd direction Or of the rotating shaft 40 is press-fitted into the inner ring of the 2nd bearing 52. In the inner ring of the first bearing 51, a portion on the side of the first direction Op is pressed into the inner ring of the rotating shaft 40 than the portion to be pressed into the second bearing 52.

The first bearing 51 is accommodated in the first bearing accommodation member 61. The second bearing 52 is housed in the second bearing accommodation member 62. Although details will be described later, the first bearing accommodation member 61 and the second bearing accommodation member 62 are fixed to the resin casing 2 directly or indirectly. From this, the rotating shaft 40 is rotatably supported by the resin casing 2 (stator 1 covered by the pair of bearings 51 and 52).

An axis retaining ring 401 is attached to the first direction Op side of the rotation shaft 40, and an axis retaining ring 402 is attached to an end portion of the second direction Or side. The shaft retaining ring 401 is in contact with the first bearing 51. The shaft retaining ring 402 is in contact with the second bearing 52. In addition, the shaft retaining ring 401 and the shaft retaining ring 402 are fitted into a groove formed in the outer circumferential surface of the rotating shaft 40 to be fixed. The shaft retaining ring 401 is in contact with the second direction Or side of the inner ring of the first bearing 51. The shaft retaining ring 401 limits the movement of the rotary shaft 40 in the first direction Op with respect to the first bearing 51.

The shaft retaining ring 402 is in contact with the first direction Op side of the inner ring of the second bearing 52. The shaft retaining ring 402 limits the movement of the rotary shaft 40 in the second direction Or with respect to the second bearing 52. The axial movement of the first bearing 51 and the second bearing 52 with respect to the stator 1 is relatively limited, and the axial movement of the rotating shaft 40 with respect to the stator 1 is limited. In addition, although the shaft retaining rings 401 and 402 employ | adopt an axis retaining ring generally called a C ring and an E ring, for example, it is not limited to this. The structure which can contact the inner ring of each of the pair of bearings 51 and 52, and can restrict the movement of the rotating shaft 40 can be employ | adopted widely. In addition, in each embodiment in this book, although the rotating shaft 40 is rotatably supported by two bearings (the 1st bearing 51 and the 2nd bearing 52), it is not limited to this. You may support with three or more bearings.

<1.6 Structure of Bearing Housing>

The 1st bearing accommodation member 61 and the 2nd bearing accommodation member 62 are metal, such as iron and brass here.

1.6.1 First Bearing Housing Member

The 1st bearing accommodation member 61 has the cylindrical shape which can accommodate the 1st bearing 51 inside. An end portion on the axial one side of the first bearing accommodation member 61 includes an end surface portion 610 through which the rotation shaft 40 penetrates the radial center portion in the axial direction. Moreover, the edge part of the other side in the axial direction of the 1st bearing accommodation member 61 is provided with the flange part 611 extended radially outward. At least a portion of the flange portion 611 is insert molded into the resin casing 2. The first bearing housing 61 is fixed to the resin casing 2 by insert molding. The flange portion 611 may be provided with a through portion penetrating in the axial direction. The resin is filled in the penetrating portion at the time of insert molding, thereby restricting the movement in the circumferential direction of the first bearing accommodation member 61, that is, preventing rotation.

Moreover, as long as rotation prevention is performed reliably by resin, a penetrating part is not limited to a hole, For example, the recessed part concave in a radial direction inner side and the convex part which protruded in a radial direction outer side may be sufficient. In addition, the flange portion 611 itself may have a polygonal shape (for example, a triangle or a quadrangle) or an ellipse to prevent rotation. The first bearing accommodation member 61 is fixed to the resin casing 2 by matching the central axis with the central axis Ax of the stator 1 covered by the resin casing 2. The outer ring of the first bearing 51 is press-fitted into the first bearing accommodation member 61.

And when the resin casing 2 is press-fitted into the cover 3, the 1st bearing accommodation member 61 insert-molded in the resin casing 2 moves the cover hole 30 of the cover 3 to the axial direction. Penetrates. At this time, the cover 3 and the bearing accommodation member 61 are non-contact. That is, the cover 3 and the first bearing accommodation member 61 are electrically insulated.

<1.6.2 Second Bearing Housing Member>

As shown in FIG. 2, the second bearing accommodation member 62 holds the second bearing 52. The second bearing accommodation member 62 has a housing portion 621 and an outer cylinder portion 620. The accommodating part 621 is cylindrical and accommodates the 2nd bearing 52 inside. The outer ring of the second bearing 52 is press-fitted into the accommodating part 621.

The outer cylinder part 620 is larger than the accommodating part 621, and the edge part of the side of the resin casing 2 of the 2nd direction Or of the resin casing 2 is press-fitted. The second bearing 62 is fixed to the stator 1 covered with the resin casing 2 by press-fitting the resin casing 2 into the second bearing accommodation member 62. The outer ring of the second bearing 52 is fixed with respect to the stator 1, and the center axis of the second bearing 52 coincides with the center axis Ax of the stator 1. In addition, the cover 3 is separated from the outer cylinder portion 620 of the second bearing accommodation member 62 in the axial direction with the end portion on the second direction Or side. That is, the cover 3 and the bearing accommodation member are electrically insulated.

As shown in FIG. 2, the accommodating part 621 and the outer cylinder part 620 are formed from the same member. In addition, here, the 2nd bearing accommodation member 62 draws a metal plate and manufactures it. However, it is not limited to this.

<1.7 energization member>

Motor A is a brushless DC motor. Therefore, the motor A is provided with an inverter circuit (not shown) in a drive circuit. In addition, a high frequency high voltage may be induced in the stator core 11 when the motor A is driven. The voltage difference induced in the stator core 11 causes a potential difference between the inner and outer rings of each of the first bearing 51 and the second bearing 52. When the potential difference between an inner ring and an outer ring exceeds a fixed value, discharge (sparking) may occur between the outer ring and the ball of the first bearing 51 and the second bearing 52, and the inner ring and the ball. As a result of the discharge, so-called bearing propagation occurs, in which the surfaces of the outer ring, the ball, and the inner ring of the bearing are damaged. Electroplating of the first bearing 51 and the second bearing 52 causes vibration and noise of the motor A. FIG. As a cause of electroforming, driving the switching element contained in the inverter circuit which drives the motor A by high frequency high voltage is mentioned. In addition, as a factor other than this, the potential state of a stator core, a rotor core, etc. are mentioned.

Therefore, in the motor A according to the present embodiment, the stator core 11 is electrically connected to the ground point (reference voltage) of the device in which the motor A is installed using the energizing member 8. Thereby, the voltage of the stator core 11 is lowered and generation | occurrence | production of an electric switch by the voltage guide | induced by the stator core 11 is suppressed.

In the motor A, the energization member 8 is conductive. As shown in FIG. 2, the energization member 8 includes a contact portion 81 and a ground portion 82. As shown in FIG. 2, the ground portion 82 includes a lead wire and the like, and is electrically connected to the ground point (frame ground) of the device to which the motor A is attached. Moreover, in the electricity supply member 8, the contact part 81 conducts with the ground part 82. As shown in FIG. The contact portion 81 is in contact with the stator core 11. That is, the electricity supply member 8 has the contact part 81 which contacts the stator core 11 on one side, and the ground part 82 grounded on the other side. In this way, the contact portion 81 contacts the stator core 11, and the ground portion 82, which is conductive with the contact portion 81, is electrically connected to the ground point (frame ground), thereby lowering the potential of the stator core 11. have.

As shown in FIG. 2, the contact part 81 is a screw in the motor A, and is provided with the connection part 811, the head part 812, and the flat part 813. As shown in FIG. That is, the connection part 811 is a male screw part, and the head part 812 is a head of a screw. The connecting portion 811 has a cylindrical shape with a male screw. The head part 812 is formed in the same member at the edge part of one side (diameter outer side in FIG. 2) of the connection part 811. As shown in FIG. The surface portion 813 is a surface on the side of the connection portion 811 of the head part 812 and is flat. That is, as for the energization member 8, the head part 812 is formed in the connection part 811 and the edge part on one side of the connection part 811. As shown in FIG. The connecting portion 811 and the head 812 are formed of the same member. In addition, the flat part 812 is a surface of the head part 812 at the connection part 811 side, and is flat.

An end portion of the contact portion 81 of the contact portion 811 opposite the head part 812 and the opposite side (the other side) of the contact portion 81 is connected to the outer peripheral surface of the resin casing 2 and the resin casing 2. The covering cover 3 penetrates from the radially outer side to the inner side. The male screw at the tip of the contact portion 81 is engaged with the female screw of the screw hole 110 formed in the stator core 11. Thereby, the connection part 811 and the stator core 11 contact. That is, the other end part of the connection part 811 contacts the stator core 11. The male screw of the connecting portion 811 is also engaged with the female screw of the screw hole 302 of the cover 3. The energization member 8 is supported by the cover 3. In addition, the flat portion 813 is in contact with the outer circumferential surface of the cover 3. That is, the outer surface of the cover 3 and the flat portion 813 of the head part 812 are in contact with each other. Even when an external force acts on the electricity supply member 8 by the electricity supply member 8 being supported by the cover 3 whose strength is higher than the resin casing 2, the cover 3 opposes the external force. Therefore, excessive force hardly acts on the resin casing 2, and a problem hardly arises.

And the edge part of the lead wire which is the ground part 82 is fitted in the outer peripheral surface of the flat part 813 and the cover 3. And the edge part on the opposite side to the planar part 813 of the ground part 82 is connected with the ground point (frame ground) of the apparatus to which the motor A is attached. As a result, the potential of the stator core 11 can be lowered. The ground portion 82 may be connected to an earth provided separately from the frame ground.

As shown in FIG. 2, the first bearing accommodation member 61 and the cover 3 are electrically insulated. In addition, the second bearing accommodation member 62 and the cover 3 are electrically insulated. That is, the cover 3 and the bearing accommodation members 61 and 62 are electrically insulated. From this, the 1st bearing accommodation member 61, the 2nd bearing accommodation member, and the electricity supply member 8 are electrically insulated. That is, the bearings 51 and 52 and the energizing member 8 are electrically insulated. Moreover, in this embodiment, although the bearing and the electricity supply member are insulated by insulating the cover 3 and the bearing accommodation members 61 and 62, it is not limited to this. For example, the bearing and the bearing housing member may be insulated. Moreover, in addition to these, the method of electrically insulating a bearing and an electricity supply member can be employ | adopted widely.

In addition, in this embodiment, although the front-end | tip of the connection part 811 is twisted in the screw hole 110 of the stator core 11, it is not necessary to twist it when the connection part 811 and the stator core 11 are electrically connected. . In addition, although the screw provided with the male screw in the connection part 811 as the contact part 81 of the electricity supply member 8, and the head part 812 which is a screw head formed from the same member as a female thread is demonstrated as an example, It is not limited. As the contact portion, for example, a configuration in which the stator core 11 is in contact with the stator core 11, such as rivets and split pins, and the head can contact the outer peripheral surface of the cover 3 can be widely adopted. Further, the tip of the lead wire included in the ground portion 82 is inserted into the hole formed in the resin casing 2 and the cover 3, and is adhered to the stator core 11 with an electrically conductive adhesive to contact the contact portion 81. You may make it. The contact portion 81 can adopt a configuration capable of electrically conducting the ground portion 82 and the stator core 11 to each other.

<1.8 Other Components>

As shown in FIG. 2, in the motor A, the second direction Or side of the resin casing 2 is press-fitted into the outer cylinder portion 620 of the second bearing accommodation member 62. Therefore, entry of foreign substances such as water, dust, and dust from the gap between the outer cylinder portion 620 and the resin casing 2 is suppressed. On the other hand, the first direction Op side of the motor A, the portion through which the rotating shaft 40 of the end surface portion 610 penetrates between the rotating shaft 40 so as not to interfere with the rotation of the rotating shaft 40. It is the size at which the gap is formed. From this gap, foreign substances such as water, dust, dust, and the like easily enter the motor A. Therefore, the motor A is provided with a bearing side intrusion prevention member 71 and a shaft side intrusion prevention member 72 for suppressing entry of foreign matter from the first bearing accommodation member 61.

As shown in FIG. 2, the bearing side intrusion preventing member 71 covers the outer surface of the first bearing accommodation member 61. And it extends in the radial direction while surrounding the outer side of the rotating shaft 40. As shown in FIG. The bearing side intrusion preventing member 71 is formed of a material such as rubber, for example, and is in close contact with the first bearing accommodation member 61. In addition, the bearing side intrusion prevention member 71 has a space | interval between the rotating shaft 40, ie, it is attached, maintaining a non-contact.

Moreover, the shaft side intrusion prevention member 72 is arrange | positioned surrounding the radially outer side of the bearing side intrusion prevention member 71. As shown in FIG. The shaft side intrusion prevention member 72 is arrange | positioned in the groove | channel 400 provided in the rotating shaft 40. As shown in FIG. As a result, the axial movement of the shaft-side intrusion preventing member 72 is limited. By reducing the space between the bearing side intrusion prevention member 71 and the shaft side intrusion prevention member 72, entry of foreign matter into the motor A is suppressed. That is, the bearing side intrusion prevention member 71 and the shaft side intrusion prevention member 72 serve to suppress the entry of the foreign material into the motor A by attaching it to the motor A at the same time.

A part of the tip of the shaft side intrusion preventing member 72 on the second direction Or side overlaps with the concave hole 21. Moreover, although the casing contact part 31 of the cover 3 is also provided in the recessed hole 21, the shaft side intrusion prevention member 72 is fixed to the rotating shaft 40 in the non-contact state with the casing contact part 31. As shown in FIG. That is, a part of the opening of the shaft side intrusion prevention member 72 is arrange | positioned in the recess hole 21. And since the casing contact part 31 and the shaft side intrusion prevention member 72 are non-contact, the rotating shaft 40 does not restrict rotation.

Moreover, the board | substrate Bd and the protective sheet Is are provided in the 2nd direction Or side rather than the stator 1 of the resin casing 2. The substrate Bd is provided with a control circuit (not shown) for controlling the timing of the current supplied to the plurality of windings 13, the magnitude of the current, and the like. Moreover, the control circuit may be provided outside the motor A, and in that case, the board | substrate Bd may be abbreviate | omitted. The protective sheet Is is an insulating member disposed between the substrate Bd and the second bearing accommodation member 62. It is provided in order to prevent the short circuit of the 2nd bearing accommodation member 62 and the board | substrate Bd. In the case of a motor which does not have the board | substrate Bd, you may abbreviate | omit the protective sheet Is.

<1.9 Motor Operation>

The operation of the motor A shown above will be described. At the time of driving the motor A, the winding 13 is supplied with a current. At this time, the winding 13 generates heat by electric current. At this time, the stator core 11 is also heated by the heat of the winding 13. The stator core 11 and the winding 13 are covered with the resin casing 2. The heat of the stator core 11 and the winding 13 is transferred to the resin casing 2.

The heat of the resin casing 2 is transferred to the cover 3. The cover 3 is mainly made of metal and has a smaller coefficient of linear expansion than the resin casing 2. Thereby, the difference of the deformation amount by the thermal expansion of the resin casing 2 and the cover 3 generate | occur | produces. However, the resin casing 2 and the cover 3 are press-fitted in the press fitting part 22 of the resin casing 2. Therefore, since the heat of the resin casing 2 is transmitted to the cover 3 to radiate heat, the thermal expansion of the resin casing 2 is suppressed in the press-fit portion 22.

In the resin casing 2, the insulator 12 is sealed with the resin casing 2 at the portion shifted in the axial direction from the press-fit portion 22. The insulator 12 is resin, and the linear expansion coefficient of the insulator 12 is larger than the stator core 11. Therefore, the part which does not overlap in the radial direction with the stator core 11 of the resin casing 2 is compared with the press-in part 22 which overlaps with the stator core 11 in the radial direction, and the deformation to radially outer side by thermal expansion is Greater than Moreover, since the distance of the cover 3 is further from the stator core 11, heat dissipation is inferior to the press-fit part 22. FIG. Therefore, problems such as distortion and misalignment of the resin casing 2 due to the difference in the amount of deformation due to thermal expansion of the insulator 12 and the cover 3 occur.

In addition, in the opening side (the 2nd direction Or side in FIG. 2) of the cover 3 of the resin casing 2, the deformation by the thermal expansion of the resin casing 2 is avoided to the opening side. On the other hand, the depth side (the 1st direction Op side in FIG. 2) of the cover 3 has no place to avoid the deformation | transformation by thermal expansion. Therefore, in the motor A, the clearance Gp is provided between the cover 3 and the resin casing 2 on the outer side of the insulator 12 in the radial direction.

Thereby, the difference of the deformation amount of the resin casing 2 and the cover 3 in the position (especially the depth side in a press-in direction) deviated from the stator core 11 of the resin casing 2 in the axial direction is gap | interval. Is absorbed by (Gp). Thereby, problems, such as the distortion and the shift | offset | difference of the resin casing 2 by the difference of the deformation amount by the thermal expansion of the resin casing 2 and the cover 3, can be suppressed.

According to the motor A of this embodiment, the clearance gap was formed in the part from which the difference of the deformation amount by the heat of the resin casing 2 and the cover 3 becomes large. By absorbing the difference in the amount of deformation due to the heat of the resin casing 2 and the cover 3 in the gap Gp, the warpage and the deviation due to the difference in the amount of heat deformation can be suppressed. In addition, the gap between the resin casing 2 and the cover 3 can be easily formed by forming the recess 23 in the resin casing 2. In addition, the thin part of the resin casing 2 with which the recessed part 23 was provided, ie, the part which overlaps the recessed part 23 in radial direction in FIG. 2, is thinner than the other part of the resin casing 2 ( 24). Thus, by forming the thin part 24, it becomes easy to discharge the heat which generate | occur | produces when an electric current flows in the crossover part 131 to the exterior of the resin casing 2. As shown in FIG.

In this embodiment, the electricity supply member 8 which contacts the cover 3 is grounded at the ground point (frame ground). The ground point (frame ground) is a reference voltage of the device, and may be changed under the influence of driving of a motor A or a power supply circuit (not shown). And when the outer ring of the 1st bearing 51 and the 2nd bearing 52 is connected to the ground point from which a reference voltage changes, there exists a possibility that electric generation may arise depending on conditions. Therefore, in the motor A, the 2nd bearing accommodation member 62 electrically conductive with the outer ring of the 1st bearing accommodation member 61 and the 2nd bearing 52 which are electrically conductive with the outer ring of the 1st bearing 51. ) And the cover 3 are insulated. Thereby, it is suppressed that the 1st bearing 51 and the 2nd bearing 52 are connected to the ground point (frame ground), and suppression of electric power generated by the deviation of a reference voltage is suppressed. In addition, as described above, the voltage of the stator core 11 is connected to the ground point (frame ground) so that the voltage is lowered to the reference voltage. This also suppresses electrical generation generated on the basis of the induced voltage generated in the stator core 11.

In the motor A, the 1st bearing 51 and the 2nd bearing 52 can rotate with high precision by suppressing generation | occurrence | production of bearing transfer. This enables stable operation over the long period of the mold motor A. FIG. That is, the life of the mold motor A can be extended.

<1.10 Modifications>

<1.10.1 Modification 1>

The modification of the motor shown in this embodiment is demonstrated with reference to drawings. 6 is a partial cross-sectional view showing a resin casing and a cover of a modification of the motor according to the present embodiment. The motor A1 shown in FIG. 6 has the same structure as the motor A shown in FIG. 2 except that the resin casing 2a1 and the cover 3a1 are different. Therefore, while attaching | subjecting the same code | symbol to a substantially same part, detailed description of the same part is abbreviate | omitted.

In the motor A1 shown in FIG. 6, the outer peripheral surface of the resin casing 2a1 becomes a small diameter gradually toward the depth side of a press-in direction, ie, the 1st direction Op side in FIG. That is, let the outer peripheral surface of the resin casing 2a1 be the inclined surface (taper surface) which becomes a small diameter in the depth side of a press-in direction. The cover 3a1 has a shape into which the resin casing 2a1 can be inserted. The cover 3a1 has a cylindrical shape, and gradually becomes a small diameter toward at least the depth side of the indentation direction of the inner circumferential surface, that is, the first direction Op side in FIG. 6. That is, the inner diameter of the cover 3a1 gradually decreases toward the pressing direction of the resin casing 2a1. By changing the shapes of the resin casing 2a1 and the cover 3a1, insertion becomes easy. Moreover, since the press fitting part 221 is an inclined surface, the deformation amount of the resin casing 2a1 at the time of press fitting can be made small. Thereby, it is easy to suppress generation | occurrence | production of the distortion of the stator 1, etc ..

<1.10.2 Modification 2>

The modification of the motor shown in this embodiment is demonstrated with reference to drawings. 7 is a partial cross-sectional view showing a resin casing and a cover of another modification of the motor according to the present embodiment. The motor A2 shown in FIG. 7 has the same structure as the motor A shown in FIG. 2 except that the resin casing 2a2 and the cover 3a2 are different. Therefore, while attaching | subjecting the same code | symbol to a substantially same part, detailed description of the same part is abbreviate | omitted.

In the motor A2 shown in FIG. 7, the outer peripheral surface of the resin casing 2a2 becomes a small diameter stepwise toward the depth side of a press-in direction, ie, the 1st direction Op side in FIG. That is, the outer peripheral surface of the resin casing 2a2 has a plurality of different outer shapes. And the outer peripheral surface of the resin casing 2a2 has a small diameter in the depth side of a press-in direction, and a step is formed in the part to which an external shape changes. The cover 3a2 has a shape into which the resin casing 2a2 can be inserted. The cover 3a2 is cylindrical and at least the depth side of the inner circumferential surface in the pressing direction, that is, the first direction Op side in FIG. 7 becomes a small diameter stepwise. That is, the inner diameter of the cover 3a2 decreases stepwise toward the press-in direction of the resin casing 2a2.

By providing the shape of the resin casing 2a2 and the cover 3a2, insertion becomes easy. Moreover, it is possible to make the positioning at the time of inserting the resin casing 2a2 into the cover 3a2 by making the step of the resin casing 2a2 and the step of the cover 3a2 contact. In addition, the press-fitting portion 222 of the resin casing 2a2 comes in contact with the press-fitted portion of the cover 3a2 to start press-fitting. As a result, the force acting on the press-in can be reduced. The deformation amount of the resin casing 2a2 at the time of press fitting can be made small. Thereby, it is easy to suppress generation | occurrence | production of the distortion of the stator 1, etc ..

<2nd embodiment>

Another example of a motor according to the present invention will be described with reference to the drawings. 8 is an exploded perspective view of another example of a motor according to the present invention. 9 is a cross-sectional view of the motor shown in FIG. 8. As shown to FIG. 8 and FIG. 9, the resin casing 2b of the motor B is provided with the step part 25 extended radially outward on the 2nd direction Or side. A plurality of stepped portions 25 are provided in the resin casing 2b (here, four). In the stepped portion 25, the resin casings 2b are arranged at equal intervals in the circumferential direction at the same position in the axial direction. And the cover 3b is provided with the contact part 311 which protruded outward from the outer peripheral surface. As for the contact part 311, when the resin casing 2b is press-fitted into the cover 3b, the contact part 311 contacts the step part 25. As shown in FIG. The contact portion 311 is in contact with the surface of the stepped portion 25 in the press-in direction (the first direction Op side in FIG. 9).

This step part 25 is a convex part for attachment for attaching the motor B to an apparatus. Therefore, fixing tools, such as a screw, penetrate the stepped portion 25. And the contact part 311 which contacts the step part 25 formed from the same member as the resin casing 2b is formed with the same member as the cover 3b which is higher in strength than the resin casing 2b. Thereby, the motor B can be fixed firmly. Moreover, even if vibration, an impact, or the like acts, the motor B becomes difficult to fall off. The number and positions of the stepped portions 25 are not limited to the above, but are changed depending on the shape and position of the attachment point (not shown) of the device to which the motor B is attached.

The cover 3b is electrically insulated from the first bearing accommodation member 61 and the second bearing accommodation member 62. Then, the stator core 11 conducts to the ground point (frame ground) by the energizing member 8, thereby lowering the potential of the stator core 11. Thereby, generation | occurrence | production of an electric switch by the induced voltage which arises in the stator core 11 is suppressed. In addition, the device to which the motor A is attached may be in contact with the contact portion 311. And, when the part in contact with the contact portion 311 of the device is the same potential as the ground point (frame ground), the conduction member 8 is made to the same voltage as the ground point (frame ground) through the cover 3, that is, the ground point Connected with. At this time, the ground portion 82 of the energization member 8 may be omitted.

About features other than this, it is the same as that of 1st Embodiment.

<3. Third Embodiment>

10 is a cross-sectional view of another example of a motor according to the present invention. Although the stator 1c and the resin casing 2c are different in the motor C shown in FIG. 10, about the other part, it is the same as the motor A of 1st Embodiment. Therefore, while attaching | subjecting the same code | symbol to the substantially same part as the motor A of the structure of the motor C, detailed description of the same part is abbreviate | omitted.

As shown in FIG. 10, in the stator 1c of the motor C, the insulator core back part 122 is provided in the edge part of the insulator 12 in the 1st direction Op side. And the wiring part 120c in which the crossover part 131 is arrange | positioned at the insulator core back part 122 is provided. And the recessed part 23c is formed in the position which axially overlaps with the wiring part 120c of the resin casing 2c.

And the part of the recessed part 23c is the thin part 24c. A gap Gp is provided between the recess 23c and the cover 3c overlapping in the axial direction.

The press-fit part 22 of the resin casing 2c is provided on the outer circumferential surface. Therefore, when press-fitting the resin casing 2c into the cover 3c, the force at the time of press-fitting acts on the outer peripheral surface of the resin casing 2c. In the motor C, since the recessed part 23c is provided in the edge part at the side of the 1st direction Op of the axial direction, the force at the time of a press injection hardly concentrates in the recessed part 23c. Thereby, the shift | offset | difference with respect to the resin casing 2c of the cover 3c is also suppressed. From this, the resin casing 2c can be in the state which electrically conducted the 1st bearing accommodation member 61 and the 2nd bearing accommodation member 62.

About features other than this, it is the same as that of 1st Embodiment.

<4. Fourth Embodiment>

Another example according to the present invention will be described with reference to the drawings. 11 is an exploded perspective view of yet another example of a motor according to the present invention. 12 is a cross-sectional view of the motor shown in FIG. 11. In the motor D of this embodiment, the motor A of the first embodiment is different from the cover, the first bearing accommodation member 61d, the second bearing accommodation member 62d, and the bearing side intrusion preventing member 71d. ) Has the same configuration. Therefore, in the structure of the motor D, the same code | symbol is attached | subjected to the same part as the structure of the motor A substantially, and detailed description of the same part is abbreviate | omitted.

<4.1 Cover>

As shown to FIG. 11, FIG. 12, the cover of the motor D is equipped with the 1st cover member 3da and the 2nd cover member 3db. That is, the cover is the first cover member 3da covering the resin casing 2 from one side in the axial direction (the first direction Op side) and the other side in the axial direction (the second direction Or 2 side) is provided with the 2nd cover member 3db which covers the resin casing 2 from the side). The 1st direction Op side of the resin casing 2 is press-fitted in the 1st cover member 3da. Moreover, the 2nd direction Or side of the resin casing 2 is inserted in the 2nd cover member 3db. Moreover, in the motor D of this embodiment, although the resin casing 2 press-fits to the 1st cover member 3da in the 1st direction Op side, it is not limited to this. For example, the 2nd direction Or side of the resin casing 2 may be press-fitted in 2nd cover member 3db. In addition, both sides may be press-fitted. Which cover member of the first cover member 3da and the second cover member 3db is press-fitted is determined by the position of the press-in part 22 of the resin casing 2.

<4.2 First cover member>

As shown to FIG. 11, FIG. 12, the 1st cover member 3da is a bottomed cylindrical shape in which at least one part of the edge part on the 1st direction Op side was closed. And the 1st cover member 3da is equipped with the 1st flange 32 extended radially outward at the edge part of the 2nd direction Or side. That is, the first cover member 3da has a first flange 32 extending radially outward from the outer circumferential surface. As shown in FIG. 11, the 1st flange 32 is square (for example, square) in axial direction. Moreover, the shape which can be attached to the attachment location of the apparatus (not shown) to which the motor D is attached is employ | adopted as the 1st flange 32. As shown in FIG.

Further, the radial center of the bottom of the first cover member 3da and the first bearing accommodation member 61d are formed of the same member. That is, the cover (first cover member 3da) and the bearing housing member (first bearing housing member 61d) are formed of the same member. And the 1st bearing accommodation member 61d and the bearing side intrusion prevention member 71d are formed from the same member. That is, the 1st cover member 3da, the 1st bearing accommodation member 61d, and the bearing side intrusion prevention member 71d are formed from the same member. That is, the first bearing accommodation member 61d protrudes from the bottom of the first cover member 3da toward the first direction Op. And the bearing side intrusion prevention member 71d protrudes from the radial direction center part of the end surface part 610d by the side of the 1st direction Op of the 1st bearing accommodation member 61d to the 1st direction Op. In addition, the bearing side intrusion prevention member 71d is formed of the same member as the first bearing accommodation member 61d, that is, metal.

The first bearing accommodating member 61d is formed of the same member as the first cover member 3da, but the first bearing accommodating member 61 of the motor A has a point of storing the first bearing 51 therein. It plays the same role as In addition, although the bearing side intrusion prevention member 71d differs in material, about the point which suppresses mixing of foreign materials, such as water, dust, and dust, by using together with the shaft side intrusion prevention member 72, the bearing side of the motor A is carried out. It plays the same role as the intrusion prevention member 71.

An insulating member 303 having an inner diameter larger than that of the connecting portion 811 of the energizing member 8 penetrates through the outer circumferential surface of the first cover member 3da. And the connection part 811 of the electricity supply member 8 penetrates the insulation member 303. As shown in FIG. At this time, the connecting portion 811 and the first cover member 3da are noncontact, that is, electrically insulated.

<4.3 second cover member>

As shown to FIG. 11, FIG. 12, the 2nd cover member 3db is a cylindrical member extended in an axial direction. The second cover member 3db and the second bearing accommodation member 62d are formed of the same member. Moreover, 62 d of 2nd bearing accommodation members are continuously formed in the edge part of the 2nd direction Or of the 2nd cover member 3db. That is, the cover (2nd cover member 3db) and the bearing accommodation member (2nd bearing accommodation member 62d) are formed from the same member. Moreover, the 2nd cover member 3db is equipped with the 2nd flange 33 extended radially outward at the edge part of the 1st direction Op side. That is, the second cover member 3db has a second flange 33 extending radially outward from the outer circumferential surface. As shown in FIG. 11, the 2nd flange 33 is square (for example, square) in axial direction. The second flange 33 has a shape overlapping with the first flange 32 in the axial direction.

The second bearing accommodating member 62d has a motor A except that the portion of the motor A that contacts the outer cylinder portion 620 of the second bearing accommodating member 62 is continuous with the same member as the second cover member 3db. ) Has the same configuration as that of the second bearing accommodation member 62. That is, 62d of 2nd bearing accommodation members are equipped with the accommodating part 621d which accommodates the 2nd bearing 52. As shown in FIG.

<4.4 Motor Assembly>

The resin casing 2 is inserted into the first cover member 3da from the first direction Op side, and the press-fitting portion 22 is press-fitted into the first cover member 3da. On the other hand, the 2nd cover member 3db covers only the resin casing 2, and is not press-fitted. Therefore, the 2nd cover member 3db in which the part of the 2nd direction Or of the resin casing 2 was inserted may be able to rotate about the center axis Ax. Therefore, the projection 330 which protrudes to the 1st direction Op side is provided in the end surface of the 2nd flange 33 on the 1st direction Op side. The protrusion 330 is inserted into the positioning hole 320 formed in the first flange 32. Thereby, the position of the 1st flange 32 and the 2nd flange 33, ie, the circumferential direction of the 1st cover member 3da and the 2nd cover member 3db, is adjusted.

The first flange 32 and the second flange 33 fix the first cover member 3da and the second cover member 3db to each other. Therefore, the 1st flange 32 and the 2nd flange 33 are equipped with the screw fixing hole through which a fixture (here, a screw) passes. Then, the first cover member 3da and the second cover member 3db are fixed to each other by fixing the first flange 32 and the second flange 33 to each other. That is, when the 1st cover member 3da and the 2nd cover member 3db cover the resin casing 2, the 1st flange 32 and the 2nd flange 33 are connected directly or indirectly.

The resin casing 2 is press-fitted into the first cover member 3da, and the second cover member 3db is fixed to the first flange 32 of the first cover member 3da via the second flange 33. do. Therefore, the relative position of the stator 1 covered by the resin casing 2, the 1st bearing 51, and the 2nd bearing 52 is determined. The rotation shaft 40 is rotatably supported by the first bearing 51 and the second bearing 52.

That is, in the motor D, the rotation shaft (1) in the first bearing 51 and the second bearing 52 attached to the first cover member 3da to which the resin casing 2 is press-fitted and the covering second cover member 3db is formed. 40). As a result, the rotor 4 is fixed to the inside of the stator 1 in a radial direction and rotatably supported.

Thus, by covering the resin casing 2 with the 1st cover member 3da and the 2nd cover member 3db, it is possible to shorten the length which the press-fit part 22 press-fits. Thereby, the force acting on the resin casing 2 or the cover can be reduced, and deformation of the resin casing 2 or the cover, such as warping or misalignment, can be suppressed. Moreover, from this, the stator 1 and the rotor 4 can be correctly aligned, and the fall of the capability of the motor D can be suppressed.

In addition, the first bearing housing member 61d is formed of the same member as the conductive first cover member 3da, and the second bearing housing member 62d is the same member as the conductive second cover member 3db. It is formed. The first cover member 3da and the second cover member 3db are in contact with each other. As a result, the first bearing accommodation member 61d and the second bearing accommodation member 62d are in an electrically conductive state. In addition, it can be said that the 1st cover member 3da is a part of 1st bearing accommodation member 61d, and the 2nd cover member 3db is a part of 2nd bearing accommodation member 62d. In the motor D, the first cover member 3da and the second cover member 3db directly contact each other.

In the motor D, the first cover member 3da and the second cover member 3db directly contact each other. And the 1st cover member 3da and the electricity supply member 8 are electrically insulated. Thereby, the 2nd cover member 3db and the electricity supply member 8 are electrically insulated. As a result, the cover (the first cover member 3da and the second cover member 3db) and the energization member 8 are electrically insulated.

In this embodiment, the insulating member 303 has penetrated the electricity supply member 8 of the 1st cover member 3da. However, it is not limited to this. At least, the first cover member 3da may be made of an insulating material such as an insulating ceramic. By this structure, the 1st bearing 51 and the 2nd bearing 52 and the electricity supply member 8 can be electrically insulated, without providing the insulating member 303. FIG. This suppresses that the outer ring of the first bearing 51 and the outer ring of the second bearing 52 are connected to the ground point (frame ground). That is, the cover may have insulation.

<4.5 modification>

The modification of the motor shown in this embodiment is demonstrated with reference to drawings. 13 is a sectional view of a modification of the motor according to the present embodiment. The motor D1 shown in FIG. 13 has the same structure as the motor D shown in FIGS. 11 and 12 except that the first cover member 3da1 and the second cover member 3db1 are different. Therefore, while attaching | subjecting the same code | symbol to a substantially same part, detailed description of the same part is abbreviate | omitted.

In the motor D1 shown in FIG. 13, the resin casing 2 and the 1st bearing accommodation member 61 are the same structures as the motor A of 1st Embodiment. That is, the 1st bearing accommodation member 61 is arrange | positioned in the resin casing hole 20 of the resin casing 2, and the flange part 611 is insert-molded in the resin casing 2. As shown in FIG. And the 1st cover member 3da1 is equipped with the cover hole 30 in the edge part of the 1st direction Op side, and the casing contact part 31 presses the recessed hole 21 of the resin casing 2. In other words, the first cover member 3da1 and the first bearing accommodation member 61 are formed of different members. Then, the first bearing accommodation member 61 penetrates through the cover hole 30. At this time, a gap is formed between the inner circumferential portion of the cover hole 30 and the first bearing accommodation member 61. Thereby, the 1st cover member 3da1 and the 1st bearing 51 are electrically insulated.

As shown in FIG. 13, in the motor D1, the 2nd cover member 3db1 and the 2nd bearing accommodation member 62 are separate bodies. That is, the second cover member 3db1 is separated from the end portion on the second direction Or side by the end portion on the first direction Op side of the outer cylinder 620 of the second bearing accommodation member 62. Thereby, the 2nd cover member 3db1 and the 2nd bearing accommodation member 62 are electrically insulated.

Then, the first cover member 3da1 and the second cover member 3db1 are brought into contact by contacting the first flange 32 of the first cover member 3da1 and the second flange 33 of the second cover member 3db1. It is electrically conductive. On the other hand, the 1st cover member 3da1 supports the electricity supply member 8. The first cover member 3da1 and the first bearing accommodation member 61 are insulated, and the second cover member 3db1 and the second bearing accommodation member 62 are insulated. From this, the electricity supply member 8 is supported by the first cover member 3da1, and the stator core 11 is connected to the ground point (frame ground) through the electricity supply member 8. At this time, it can suppress that the outer ring of the 1st bearing 51 and the outer ring of the 2nd bearing 52 become a ground point (frame ground) and coincidence. This suppresses the electrical transfer of the 1st bearing 51 and the 2nd bearing 52 which generate | occur | produce by the voltage guide | induced to the stator core 11.

<5. 5th Embodiment>

Another example according to the present invention will be described with reference to the drawings. 14 is a sectional view of another example of a motor according to the present invention. In the motor E of this embodiment, the resin casing 2e, the 1st cover member 3ea, and the 2nd cover member 3eb have the same structure as the motor D of 4th Embodiment except the other. Therefore, in the structure of the motor E, the same code | symbol is attached | subjected to the same part as the structure of the motor D substantially, and the detailed description of the same part is abbreviate | omitted. Moreover, in the motor E, the 1st bearing 51 is accommodated in the 1st bearing accommodation member 61 of the same structure as the motor A. As shown in FIG.

As shown in FIG. 14, the resin casing 2e of the motor E is provided with the step part 25e which protrudes radially outward from the part near the 2nd direction Or from the press-in part 22 of the outer peripheral surface. . Moreover, although the step part 25e differs from the step part 25 with which the motor B shown in FIG. 8, FIG. 9 has an axial position, it has the same shape and is provided for the same purpose. That is, four stepped portions 25e are provided in the resin casing 2e, and are arranged at equal intervals in the circumferential direction. In addition, the first bearing accommodation member 61 is fixed to an end portion of the resin casing 2e on the first direction Op side. In addition, since the fixing method of the 1st bearing accommodation member 61 is the same as that of the resin casing 2 of the motor A, the detail is abbreviate | omitted.

The first cover member 3ea has a bottomed cylindrical shape with closed ends at the first direction Op. And the bottom part is provided with the cover hole 30 and the casing contact part 31 similarly to the cover 3. Moreover, the 1st cover member 3ea is equipped with the 1st flange 32 which has the same structure as the 1st cover member 3da. When the resin casing 2e is press-fitted into the first cover member 3ea, the first bearing accommodating member 61 passes through the cover hole 30. At this time, the first bearing accommodating member 61 and the first The cover member 3ea is noncontact, that is, electrically insulated.

The second cover member 3eb is a cylindrical member extending in the axial direction. The second cover member 3eb and the second bearing accommodation member 62 are formed of different members. An end portion on the second direction Or side of the second cover member 3eb and an end portion on the first direction Op side of the outer cylinder 620 of the second bearing accommodation member 62 are spaced apart in the axial direction. Thereby, the 2nd cover member 3eb and the 2nd bearing accommodation member 62 are electrically insulated.

Moreover, the 2nd cover member 3eb is equipped with the 2nd flange 33e extended radially outward and the contact part 35e at the edge part of the 1st direction Op side. The second flange 33e comes in contact with the first flange 32 of the first cover member 3ea when the second cover member 3eb is covered from the second direction Or of the resin casing 2e. Formed in position. Moreover, the contact part 35e contacts the end surface of the step part 25e in the 2nd direction Or of the step part 25e, when the 2nd cover member 3eb is coat | covered from the 2nd direction Or of the resin casing 2e. It is formed at the position.

As shown in FIG. 14, in the 2nd cover member 3eb, the 2nd flange 33e is provided in the 1st direction Op side rather than the contact part 35e. The second flange 33e and the contact portion 35e are alternately arranged in the circumferential direction.

When the resin casing 2 is press-fitted into the first cover member 3da, the first flange 32 contacts the end face of the step portion 25e on the first direction Op side. And the 2nd cover member 3eb covers the 2nd direction Or side of the resin casing 2e. At this time, the contact portion 35e of the second cover member 3eb contacts the end surface of the step direction 25e of the resin casing 2e on the second direction Or side, and the second flange 33e is the first. Contact with the flange 32.

Thus, since the resin casing 2e is provided with the step part 25e, positioning in the axial direction at the time of press-fitting into the 1st cover member 3ea becomes easy. Similarly, axial positioning of the second cover member 3eb with respect to the resin casing 2e becomes easy. In addition, the first cover member 3ea and the first bearing accommodation member 61 are electrically insulated from each other. The second cover member 3eb and the second bearing accommodation member 62 are electrically insulated from each other. As a result, even when the conducting member 8 supported by the first cover member 3ea connects the stator core 11 to the ground point (frame ground), the first bearing accommodation member 61 and the second bearing accommodation are accommodated. The member 62 is not connected to the ground point (frame ground). Thereby, it is suppressed that the 1st bearing 51 and the 2nd bearing 52 are connected to the ground point (frame ground), and suppression of electric power generated by the deviation of a reference voltage is suppressed. In addition, as described above, the voltage of the stator core 11 is connected to the ground point (frame ground) so that the voltage is lowered to the reference voltage. This also suppresses electrical generation generated on the basis of the induced voltage generated in the stator core 11.

As mentioned above, although embodiment of this invention was described, embodiment can be variously modified as long as it exists in the range of the meaning of this invention.

(Industrial availability)

The present invention can be used as a motor for driving a blowing fan such as an air conditioner and a fan.

A… Motor, A1... Motor, A2... Motor, B... Motor, C… Motor, D... Motor, D1... Motor, E… Motor, 1... Stator, 11... Stator core, 110... . Screw hole, 111... Core back part, 112... Tisbu, 12... Insulator, 120... Wiring section 121... Insulator teeth, 122... Insulator core back, 13.. Reel, 130... Crossover portion, 2... Resin casing, 20... Resin casing hole, 200... Concave groove, 201... Home, 2011… Home, 2012… Home, 0202... Hole, 21... . Concave hole, 211... First opening, 212... Second opening, 22... Press-fitting part, 23. Recess, 231... Projection, 24... Thin, 25. Step, 25e... Stepped portion, 3... Cover, 3b... Cover, 3c... Cover, 3da… First cover member, 3db... Second cover member, 3ea... First cover member, 3eb... Second cover member, 30... Cover hole, 31... Casing contact, 310... Through part, 311... . Contact, 41... Inner barrel, 32... First flange, 33.. Second flange, 33e... Second flange, 4... Rotor, 40... Rotation axis 411... Cylindrical member, 412... Axial support member, 400... Home, 401... Axial retaining ring, 402... Axial retaining ring, 42... Magnet, 43... Mold portion 51... First bearing, 52... Second bearing, 61... First bearing accommodation member, 610... End, 611... Bearing flange, 62... Second bearing accommodation member, 620... 621. Storage portion 71. Bearing side intrusion preventing member, 72... .. shaft side intrusion prevention member, 8.. Current-carrying member, 81. Contact portion 811... 812.. Two Governments, 813... Flat portion 82... Ground, Bd.. Substrate, Is... Protection sheet

Claims (11)

A rotor having an axis of rotation extending along a central axis,
A stator having a plurality of windings wound through an insulator on a stator core that faces the outer circumferential surface of the rotor in a radial direction;
A resin casing for sealing at least the insulator and the winding of the stator;
A plurality of bearings rotatably supporting the rotating shaft at positions apart from each other in an axial direction;
A cover covering an outer circumferential surface of the resin casing;
It is provided with an electricity supply member which has electroconductivity,
The stator includes a plurality of bearing accommodation members, each of which receives the plurality of bearings,
The energizing member is supported by the cover,
The energizing member has a contact portion in contact with the stator core on one side and a ground portion grounded on the other side,
And the bearing and the energizing member are electrically insulated. The method of claim 1,
And the cover and the bearing accommodation member are electrically insulated. The method according to claim 1 or 2,
And the cover has insulation. The method according to any one of claims 1 to 3,
And the cover and the conductive member are electrically insulated. The method of claim 4, wherein
And the cover and the bearing accommodation member are formed of the same member. The method according to any one of claims 1 to 5,
The energization member,
It is provided with a connection part and the head part provided in the edge part on one side of the said connection part,
The connecting portion and the head portion are formed of the same member,
The flat part of which the surface of the said connection part side of the said head part is planar,
The other end of the connecting portion is in contact with the stator core,
A motor in contact with the outer surface of the cover and the flat portion of the head. The method according to any one of claims 1 to 6,
The cover has a cylindrical shape extending in the axial direction,
And the resin casing is provided with a press-fitting portion press-fitted in the cover. The method of claim 7, wherein
And the press-fit portion overlaps the stator core by viewing the resin casing in a radial direction. The method according to claim 7 or 8,
The inner diameter of the cover is gradually reduced toward the indentation direction of the resin casing. The method according to claim 7 or 8,
And the inner diameter of the cover decreases in steps toward the indentation direction of the resin casing. The method according to any one of claims 1 to 10,
The cover,
A first cover member covering the resin casing from one side in the axial direction,
It is provided with the 2nd cover member which covers the said resin casing from the other side in an axial direction,
The first cover member has a first flange extending radially outward from the outer circumferential surface,
The second cover member has a second flange extending radially outward from the outer circumferential surface,
And the first cover member and the second cover member are directly or indirectly connected to the first flange and the second flange when the resin casing is covered.

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