JP5967253B2 - Direct drive motor and insulator - Google Patents

Description

  The present invention relates to a direct drive motor including an insulator that insulates a coil from a stator.

  2. Description of the Related Art Conventionally, various direct drive motors that directly transmit a rotational force to a rotating body without rotating a reduction mechanism (for example, a reduction gear, a transmission belt, etc.) and rotate the rotating body in a predetermined direction are known. (For example, refer to Patent Document 1).

JP 2000-139068 A

  Direct drive motors often include an insulator that insulates the coil from the stator. This insulator has a hollow annular shape. Since the insulator is a molded part, it is necessary to lower the mold cost in order to reduce the cost. In order to reduce the mold cost, it is effective to reduce the size of the molded part. For this reason, the same molded parts may be arranged in a circumferential shape to form a hollow annular shape, which may be an insulator, but a seam portion is generated between the molded parts. Since the above-described coil is wound around the insulator, the coil winding may fray at the joint.

  The present invention has been made in view of the above, and provides a direct drive motor capable of reducing the cost of an insulator that insulates a coil from a stator and suppressing the risk of fraying of a coil winding. With the goal.

  In order to achieve such an object, the present invention includes a rotating body that is rotatably supported with respect to a base, and a motor that rotates the rotating body. The motor is arranged concentrically with the rotating body. A direct drive motor comprising: a stator fixed to a stator; a rotor disposed opposite to the stator and fixed to a rotating body; and an insulator that insulates a coil wound around the stator from the stator. The insulator body has an annular shape, and the insulator body has a seam portion that divides the insulator body in the circumferential direction. The seam portion is made thicker than other parts. It is configured.

  In the present invention, the motor is isolated and protected from the outside by the motor cover, and the motor cover is fixed to the base by the fastening mechanism in a state of being placed on the spacer. The insulator is placed at a predetermined position in the insulator. A holding part for positioning and holding is provided.

  In the present invention, the fastening mechanism has a long screw that can be inserted into a stator through hole formed in the stator and screwed into a base screw hole formed in the base, and the motor cover is attached to the spacer. Then, the motor cover is fixed to the base by screwing the long screw into the base screw hole through the stator through hole from the insertion hole formed in the spacer.

  In the present invention, in the holding portion, the surrounding structure that can surround the outer periphery of the spacer over a region that is more than half of the entire length in the circumferential direction is raised along the length direction of the spacer. Are provided at predetermined intervals in the circumferential direction along the insulator body.

  In order to achieve such an object, a direct drive motor includes a base, a stator fixed to the base, a rotor disposed to face the stator, a coil wound around the stator, and the coil from the stator. Insulating members, a hollow annular insulator main body, at least two locations in the circumferential direction of the insulator main body, a seam portion that divides the insulator main body, and the insulator main bodies on both sides in the circumferential direction of the seam portion And an insulator including a post portion that protrudes and spans the coil.

  In the present invention, it is preferable that the insulator further includes a built-up portion that is thicker than the insulator body, and the built-up portion supports the coil that spans the support column.

  In this invention, it is preferable that the said build-up part is extended from the base part of the said support | pillar part to the said joint part.

  In the present invention, it is preferable that the height H of the build-up portion satisfies the condition of the following formula (1).

  Here, V is a voltage applied to the conductor of the coil.

  In this invention, it is preferable that the space | interval used as the shortest distance of the said support | pillar parts is equal to the shortest distance of the circumferential direction both ends of the said insulator main body in the said joint part.

  In the present invention, when the shortest distance between both end portions in the circumferential direction of the insulator body at the joint is Δl, the diameter of the coil conductor is D, and the entry angle is α, Δl satisfies the following formula (2). Is preferred.

  In the present invention, the height H of the build-up portion preferably satisfies the condition of the following formula (3).

  However, the voltage applied to the coil conductor is V, θ in the formula (3) is L, the linear distance through the seam portion of the adjacent built-up portions is D, and the coil conductor diameter is D. In this case, the following expression (4) is satisfied.

  In this invention, it is preferable that the said support | pillar part protrudes with respect to the said build-up part.

  In the present invention, one end portion of the insulator body in the circumferential direction is bent through the bent portion and bent from the bent portion, and extends from the bent portion. It is preferable to further include an override portion that rides on the other end portion in the circumferential direction.

  In the present invention, it further includes a motor cover that protects the coil, and a fastening mechanism that fixes the motor cover and the base via a spacer, and the insulator holds and holds the spacer at a predetermined position. It is preferable to provide.

  In the present invention, the fastening mechanism has a long screw that can be inserted into a stator through hole formed in the stator and screwed into a base screw hole formed in the base. After mounting the motor cover on the spacer, the long screw is screwed into the base screw hole through the stator through hole from the insertion hole formed in the spacer, thereby fixing the motor cover to the base. It is preferable.

  In this invention, it is preferable that the said holding | maintenance part is a surrounding structure body which can surround the outer periphery of the said spacer, Comprising: The said surrounding structure body is provided with two or more by predetermined intervals in the circumferential direction of the said insulator main body.

  The present invention further includes a motor cover that protects the coil, and a fastening mechanism that includes a tapping screw that fixes the motor cover and the insulator, and the insulator includes a holding portion into which the tapping screw is screwed. It is preferable.

  In the present invention, the insulator includes a winding portion around which the coil is wound together with the stator, and the holding portion includes an alignment adjustment surface with a radially inner surface of the holding portion as a plane, It is preferable that the ratio of the length in the circumferential direction of the alignment adjustment surface to the length in the circumferential direction of the winding portion is not less than 0.3 and not more than 0.7.

  In the present invention, the insulator includes a wall portion protruding from a radially outer edge portion of the insulator body and extending along a circumferential direction of the insulator body excluding the joint portion, and the height of the wall portion Is preferably higher than the height of the support column.

  ADVANTAGE OF THE INVENTION According to this invention, while reducing the cost of the insulator which insulates a coil from a stator, the direct drive motor which can suppress the fear of the coil winding fraying can be provided.

FIG. 1 is a cross-sectional view schematically showing the overall configuration of a direct drive motor. FIG. 2-1 is a plan view illustrating a partially enlarged configuration of the insulator according to the first embodiment. FIG. 2B is a partially enlarged perspective view of the configuration of the insulator shown in FIG. FIG. 3 is a cross-sectional view illustrating the configuration of the fastening mechanism according to the first embodiment. FIG. 4A is a plan view illustrating a partially enlarged configuration of the insulator according to the second embodiment. FIG. 4B is a partially enlarged perspective view of the configuration of the insulator shown in FIG. FIG. 5 is a cross-sectional view illustrating a configuration of a fastening mechanism according to the second embodiment. FIG. 6A is a plan view illustrating a partially enlarged configuration of the insulator according to the third embodiment. FIG. 6B is a partially enlarged perspective view of the configuration of the insulator shown in FIG. FIG. 7-1 is a plan view illustrating a partially enlarged configuration of the insulator according to the fourth embodiment. FIG. 7-2 is a partially enlarged perspective view showing the configuration of the insulator shown in FIG. FIG. 8 is a cross-sectional view illustrating a configuration of a fastening mechanism according to the fourth embodiment. FIG. 9-1 is a plan view illustrating a partially enlarged configuration of the insulator according to the fifth embodiment. FIG. 9-2 is a perspective view showing a partially enlarged configuration of the insulator shown in FIG. 9-1. FIG. 10A is a plan view illustrating a partially enlarged configuration of the insulator according to the sixth embodiment. 10-2 is a partially enlarged perspective view illustrating the configuration of the insulator illustrated in FIG. 10-1. FIG. 11 is a partially enlarged cross-sectional view of a joint portion of an insulator according to the sixth embodiment. FIG. 12A is a plan view illustrating a partially enlarged configuration of the insulator according to the seventh embodiment. 12-2 is a partially enlarged perspective view showing the configuration of the insulator shown in FIG. 10-1. FIG. 13 is a partially enlarged perspective view illustrating a joint portion of the insulator according to the eighth embodiment. FIG. 14A is a partially enlarged plan view of the configuration of the insulator according to the ninth embodiment. FIG. 14-2 is a perspective view showing a partially enlarged configuration of the insulator shown in FIG. 14-1.

  DESCRIPTION OF EMBODIMENTS Embodiments (embodiments) for carrying out the present invention will be described in detail with reference to the drawings. The present invention is not limited by the contents described in the following embodiments. The constituent elements described below include those that can be easily assumed by those skilled in the art and those that are substantially the same. Furthermore, the constituent elements described below can be appropriately combined.

(Embodiment 1)
FIG. 1 is a cross-sectional view schematically showing the overall configuration of a direct drive motor. The direct drive motor according to the present embodiment can directly transmit a rotational force to a rotating body without a reduction mechanism (for example, a reduction gear, a transmission belt, etc.) and rotate the rotating body in a predetermined direction. .

  Direct drive motors (sometimes referred to as DD motors) include an outer rotor type and an inner rotor type. As an example, an inner rotor type DD motor as shown in FIG. The base 4, the rotating body 6 (also referred to as a motor output shaft) supported rotatably with respect to the base 4, and the base 4 and the rotating body 6 are incorporated to rotate the rotating body 6 in a predetermined direction. And a motor 8.

  The rotating body 6 is disposed along the outer peripheral side of the base 4, and a bearing 10 is interposed between the rotating body 6 and the base 4. Further, various works (not shown) are attached to the rotating body 6. By rotating the rotating body 6 by the motor 8, the various works can be rotated in a predetermined direction together with the rotating body 6. The rotating body 6 rotates about the rotation center Zr.

  The motor 8 includes a stator (stator) 8a concentrically arranged at predetermined intervals (for example, equal intervals) along the rotation direction of the rotating body 6 and fixed to the base 4, and the stator (stator) 8a. And a rotor (permanent magnet) 8b arranged concentrically at predetermined intervals (for example, at equal intervals) along the rotation direction of the rotating body 6 and fixed to the rotating body 6. Yes.

  In this case, when a coil 8c wound around a stator (stator) 8a is energized via an insulator 12 described later, the left hand of Fleming is caused by the magnetic interaction between the stator (stator) 8a and the rotor (permanent magnet) 8b. Rotational force can be applied to the rotating body 6 through the rotor (permanent magnet) 8b according to the above law. Thereby, the rotary body 6 can be rotated in a predetermined direction. The motor 8 is isolated and protected from the outside by a motor cover 14, and the motor cover 14 is fixed to the base 4 by a fastening mechanism 16 described later.

  Further, a sensor 18 for detecting the rotation state (for example, the rotation angle) of the rotating body 6 is provided between the base 4 and the rotating body 6, whereby various workpieces attached to the rotating body 6 are arranged. It is possible to accurately rotate at a predetermined angle and position the target position with high accuracy. As the sensor 18, for example, a commercially available detection element such as a resolver may be applied. The sensor 18 is isolated and protected from the outside by a disc-shaped cover 20 provided on the upper portion of the base 4.

  By the way, the above-mentioned direct drive motor is required to simultaneously realize both long-term stability and cost reduction of its rotational accuracy. Therefore, in order to meet such a demand, the existing insulator 12 and the fastening mechanism 16 are improved. This will be specifically described below. In addition, although it does not restrict | limit especially as a material of the insulator 12, What is necessary is just to apply insulating resin etc., for example.

  FIG. 2-1 is a plan view illustrating a partially enlarged configuration of the insulator according to the first embodiment. FIG. 2B is a partially enlarged perspective view of the configuration of the insulator shown in FIG. FIG. 3 is a cross-sectional view illustrating the configuration of the fastening mechanism according to the first embodiment. 2A, 2B, and 3 show configurations of the insulator 12 and the fastening mechanism 16. FIG. Here, the insulator 12 is placed on the upper side of the stator (stator) 8a, and the coil 8c is wound around the stator (stator) 8a through the insulator 12 in this state, An insulator body 12a, and a plurality of support pillars 12b projecting along the insulator body 12a at a predetermined interval (for example, at equal intervals). The insulator body 12a includes the insulator body 12a at one location in the circumferential direction. A joint portion 12c that divides the insulator body 12a is formed.

  Further, the insulator body 12a has an insertion portion 12d through which the fastening mechanism 16 is inserted at the outer periphery thereof at a predetermined interval (for example, at equal intervals) along the circumferential direction, and the outer periphery is recessed. Has been. Furthermore, in the insulator main body 12a, winding portions 12e around which the coil 8c is wound extend radially at predetermined intervals (for example, equal intervals) along the circumferential direction.

  In such an insulator 12, the coil 8c prevents loosening when it is wound (that is, tension is applied), so that a part of the coil 8c passes another column (next phase) via the support 12b. ). With this structure, the insulator 12 can prevent loosening (ie, tension) when the coil 8c is wound.

  Further, as shown in FIG. 3, in the fastening mechanism 16, long screws 22 (hexagonal column fixing screws) that are threaded on both end sides are inserted into the stator through holes 24 formed in the stator (stator) 8a. The short screw 26 which is threaded on both sides on the other side of the long screw 22 in a state where the screw on one side is screwed into the base screw hole 4 a formed in the base 4. After fixing one side of the (hexagonal strut) by screwing and mounting the motor cover 14 on the other side of the short screw 26, the screw for fixing the motor cover through the opening hole 14h formed in the motor cover 14 The motor cover 14 is fixed to the base 4 by screwing 16 s into the other side of the short screw 26.

  In this case, in order to realize the fastening mechanism 16 described above, three screwing processes (hereinafter referred to as mounting man-hours) are required by three parts of the long screw 22, the short screw 26, and the motor cover fixing screw 16s. Then, there is a certain limit to the cost reduction of the direct drive motor because the number of parts and the number of mounting steps increase.

  As described above, the direct drive motor according to the first embodiment includes the base 4, the stator 8a fixed to the base 4, the rotor 8b disposed to face the stator 8a, and the coil 8c wound around the stator 8a. And the insulator 12. The insulator 12 is a member that insulates the coil 8c from the stator 8a. The insulator body 12a has a hollow annular shape, and a joint portion 12c that divides the insulator body 12a in at least two locations in the circumferential direction of the insulator body 12a. And post portions 12b and 12b projecting from the insulator main body 12a on both sides in the circumferential direction of the joint portion 12c and over which the coil 8c is stretched.

  With this structure, the insulator 12 can be divided into two by providing two seam portions 12c in the circumferential direction of the insulator body 12a. The number of divisions may be two or more, and the joint portion 12 c is two or more in the circumferential direction of the insulator 12. For example, the divided insulator main body 12a can be formed with the same mold by forming a point-symmetric shape with respect to the rotation center Zr. For this reason, the insulator 12 can arrange the molded parts of the same shape in a circumferential shape to form a hollow annular shape, but a joint portion 12c is generated between the molded parts. The size of the mold of the insulator 12 decreases as the number of the joint portions 12c increases in the circumferential direction of the insulator body 12a. As a result, the manufacturing cost of the insulator 12 is reduced. However, when the coil 8c is wound so as to extend over the stators 8a of different phases, there is a possibility that the winding of the coil 8c may fray at the joint portion 12c. The direct drive motor according to the first embodiment can suppress fraying of the winding of the coil 8c by the tension of the coil 8c spanned over the support column 12b. As a result, the direct drive motor according to the first embodiment can reduce the cost of the insulator 12 that insulates the coil 8c from the stator 8a, and can also prevent the winding of the coil 8c from fraying.

(Embodiment 2)
FIG. 4A is a plan view illustrating a partially enlarged configuration of the insulator according to the second embodiment. FIG. 4B is a partially enlarged perspective view of the configuration of the insulator shown in FIG. FIG. 5 is a cross-sectional view illustrating a configuration of a fastening mechanism according to the second embodiment. Note that the same components as those described in the above-described embodiment are denoted by the same reference numerals, and redundant description is omitted.

  As described in the first embodiment, in the insulator 12, the coil 8c is prevented from loosening when it is wound (that is, tension is applied), so that a part of the coil 8c is separated via the support column 12b. (The next phase). At this time, when the coil 8c passing through the support column 12b crosses the joint 12c, between the coil 8c on the joint 12c and the lower stator (stator) 8a of the insulator body 12a, It becomes difficult to secure a sufficient insulation distance.

  In this case, depending on the degree of the insulation distance, it may be difficult to apply a constant rotational force from the motor 8 to the rotating body 6. There is a limit. Here, as a measure for securing the insulation distance, for example, the insulator main body 12a may be thickened. However, since the winding space of the coil 8c is reduced, the motor 8 rotates the rotating body 6 at a constant speed. It will not be possible to secure a sufficient amount of winding to give force.

  As shown in FIGS. 4A and 4B, in the insulator 12 according to the present embodiment, the joint portion 12c is configured to be thicker than other portions. Specifically, the regions near both sides of the joint portion 12c are made thicker than other portions. In the drawing, as an example, the thickness in the range from the region near both sides of the joint portion 12c to the column portion 12b is made thicker than the other portions, and thereby, the built-up portion 12p is formed in the portion.

  As a method of increasing the thickness, for example, the thickness may be increased simultaneously in a series of molding processes of the insulator 12, or after the insulator 12 is completed, the region near both sides of the joint portion 12c may be different. The molding process may be applied to increase the thickness. Moreover, since the height (degree of thickness increase) of the build-up part 12p is set according to the use environment or use purpose of a direct drive motor, for example, it does not specifically limit here. In short, it is only necessary to ensure a sufficient insulation distance between the lower stator (stator) 8a of the insulator body 12a.

  According to such an insulator 12, even when the coil 8c passing through the support column 12b crosses the joint portion 12c, the coil 8c is positioned at the above-described overlaying portion 12p. A sufficient insulation distance can be ensured between the coil 8c on the joint portion 12c and the lower stator (stator) 8a of the insulator body 12a. This makes it possible to meet the demand for long-term stabilization of the rotational accuracy of the direct drive motor.

  Further, in the fastening mechanism 16 according to the present embodiment, the insulator 12 is positioned and held at a predetermined position in place of the above-described insertion portion 12d (see FIGS. 2-1 and 2-2) in place of the hollow cylindrical spacer Sp. A holding portion Hp is provided. In the holding portion Hp, a surrounding structure 12f that can surround the outer periphery of the spacer Sp over a region that is more than half of the entire length in the circumferential direction is raised along the length (height) direction of the spacer Sp. The surrounding structures 12f are provided at predetermined intervals (for example, at equal intervals) in the circumferential direction along the insulator body 12a.

  The fastening mechanism 16 is a single long screw that can be inserted into the stator through hole 24 formed in the stator (stator) 8 a and screwed into the base screw hole 4 a formed in the base 4. 16a. In this case, in a state where the spacer Sp is positioned and held on the surrounding structure 12f, after the motor cover 14 is placed on the spacer Sp, the long screw 16a is inserted into the stator through hole 24 from the insertion hole Sh formed in the spacer Sp. The motor cover 14 can be fixed to the base 4 by being screwed into the base screw hole 4a.

  According to such a fastening mechanism 16, a single screwing process (hereinafter referred to as mounting man-hour) with a single long screw 16a is sufficient, so that the mounting man-hour can be greatly reduced. Further, since the spacer Sp is always positioned by the surrounding structure 12f, the position of the spacer Sp is not shifted or dropped when the motor cover 14 is placed on the spacer Sp. For this reason, the screwing process using the three screws 22, 26, and 16s (see FIG. 3) described above is unnecessary, and the fixing process of the motor cover 14 can be reliably performed in a short time with only one long screw 16a. Can do. This makes it possible to meet the demand for cost reduction of the direct drive motor.

  As described above, the direct drive motor according to the second embodiment includes the base 4, the stator 8a fixed to the base 4, the rotor 8b disposed to face the stator 8a, and the coil 8c wound around the stator 8a. And the insulator 12. The insulator 12 is a member that insulates the coil 8c from the stator 8a. The insulator body 12a has a hollow annular shape, and a joint portion 12c that divides the insulator body 12a in at least two locations in the circumferential direction of the insulator body 12a. And a post portion 12b projecting from the insulator body 12a on both sides in the circumferential direction of the joint portion 12c and over which the coil 8c is stretched.

  With this structure, the insulator 12 can be divided into two by providing two seam portions 12c in the circumferential direction of the insulator body 12a. The number of divisions may be two or more, and the joint portion 12 c is two or more in the circumferential direction of the insulator 12. For example, the divided insulator main body 12a can be formed with the same mold by forming a point-symmetric shape with respect to the rotation center Zr. For this reason, the insulator 12 can arrange the molded parts of the same shape in a circumferential shape to form a hollow annular shape, but a joint portion 12c is generated between the molded parts. The size of the mold of the insulator 12 decreases as the number of the joint portions 12c increases in the circumferential direction of the insulator body 12a. As a result, the manufacturing cost of the insulator 12 is reduced. However, when the coil 8c is wound so as to extend over the stators 8a of different phases, there is a possibility that the winding of the coil 8c may fray at the joint portion 12c. In the direct drive motor according to the second embodiment, fraying of the winding of the coil 8c can be suppressed by the tension of the coil 8c spanned over the support column 12b. As a result, the direct drive motor according to the second embodiment can reduce the cost of the insulator 12 that insulates the coil 8c from the stator 8a, and suppress the risk of fraying of the winding of the coil 8c.

  The insulator 12 further includes a built-up portion 12p that is thicker than the insulator main body 12a, and the built-up portion 12p supports the coil 8c that spans the support column portion 12b. This structure restricts the position of the coil 8c through which the built-up portion 12p passes through the joint portion 12c in a direction away from the stator 8a, so that the coil 8c on the joint portion 12c and the lower stator (fixed) of the insulator body 12a are fixed. A sufficient insulation distance can be ensured between the child) 8a. This makes it possible to meet the demand for long-term stabilization of the rotational accuracy of the direct drive motor.

  Moreover, the build-up part 12p protrudes from the insulator main body 12a of the circumferential direction both sides of the joint part 12c, and is extended from the base part of the support | pillar part 12b over which the coil 8c is spanned to the joint part 12c. For this reason, the distance between the coil 8c and the lower stator (stator) 8a of the insulator main body 12a at the base of the support column 12b over which the coil 8c is spanned is the distance between the coil 8c on the joint 12c and the insulator main body 12a. The distance between the lower stator 8a and the lower stator 8a is almost equal, and the insulation distance at the joint portion 12c can be easily maintained.

  Moreover, if the build-up part 12p protrudes from the insulator main body 12a of the circumferential direction both sides of the joint part 12c, and extends from the base part of the support | pillar part 12b over which the coil 8c is spanned, other parts will be the insulator main body 12a. Can be lowered. As a result, since the winding space of the coil 8c can be secured, a sufficient winding amount of the coil 8c for applying a constant rotational force from the motor 8 to the rotating body 6 can be secured.

  Moreover, it is more preferable that the built-up portion 12p extends along the edge of the opposite end portion of the insulator body 12a which is the joint portion 12c. For this reason, the position of the coil 8c can be regulated in the direction away from the stator 8a regardless of the position where the coil 8c passes through the joint portion 12c.

(Embodiment 3)
FIG. 6A is a plan view illustrating a partially enlarged configuration of the insulator according to the third embodiment. FIG. 6B is a partially enlarged perspective view of the configuration of the insulator shown in FIG. Note that the same components as those described in the above-described embodiment are denoted by the same reference numerals, and redundant description is omitted.

  In the insulator 12 according to the third embodiment, the interval between the shortest distances between the column portions 12b and 12b protruding from the insulator main bodies 12a on both sides in the circumferential direction of the joint portion 12c is the both ends in the circumferential direction of the insulator main body 12a in the joint portion 12c. It is equal to the shortest distance between each other. Here, “equal” means substantially the same, and includes assembly errors and design tolerances.

  With this structure, it is possible to reduce the possibility that the conductor of the coil 8c slips through the space between the column portions 12b and 12b and enters the joint portion 12c. For this reason, when the coil 8c is wound around the stator 8a, the conductor of the coil 8c passes through the space between the support portions 12b and 12b, and the winding of the coil 8c with other wires can be suppressed.

(Embodiment 4)
FIG. 7-1 is a plan view illustrating a partially enlarged configuration of the insulator according to the fourth embodiment. FIG. 7-2 is a partially enlarged perspective view showing the configuration of the insulator shown in FIG. FIG. 8 is a cross-sectional view illustrating a configuration of a fastening mechanism according to the fourth embodiment. Note that the same components as those described in the above-described embodiment are denoted by the same reference numerals, and redundant description is omitted.

  As illustrated in FIGS. 7A and 7B, in the insulator 12 according to the fourth embodiment, the above-described holding portion Hp has a solid cylindrical shape. It is preferable that a positioning pilot hole 12q, which is a hole thinner than the screw diameter of a tapping screw 16b to be described later, which is not subjected to female threading, is exposed at the top of the holding portion Hp. As shown in FIG. 8, the insulator 12 according to the fourth embodiment has a motor cover 14 mounted on the top of the holding portion Hp, and then a tapping screw 16 b is screwed into the positioning pilot hole 12 q through the motor cover 14. The cover 14 can be fixed to the base 4.

  As described above, the motor 8 according to the fourth embodiment includes the motor cover 14 that protects the coil 8 c and the fastening mechanism 16 that includes the tapping screw 16 b that fixes the motor cover 14 and the insulator 12. Includes a holding portion Hp into which the tapping screw 16b is screwed. With this structure, the motor 8 according to the fourth embodiment has a reduced number of parts and can be a motor with fewer failures.

(Embodiment 5)
FIG. 9-1 is a plan view illustrating a partially enlarged configuration of the insulator according to the fifth embodiment. FIG. 9-2 is a perspective view showing a partially enlarged configuration of the insulator shown in FIG. 9-1. Note that the same components as those described in the above-described embodiment are denoted by the same reference numerals, and redundant description is omitted.

  The insulator 12 according to the fifth embodiment includes a wall portion 12g that protrudes from a radially outer edge portion of the insulator main body 12a and extends along the circumferential direction of the insulator main body 12a excluding the joint portion 12c. The height of the wall portion 12g is preferably higher than the height of the column portions 12b and 12b around which the coil 8c is stretched. The motor cover 14 described above is installed for protection from falling objects or external noise from the outside. For this reason, the motor cover 14 is often a conductor made of copper or the like, and it is necessary to maintain insulation between the motor cover 14 and the coil 8c. The insulator 12 according to the fifth embodiment includes an insulator wall 12g on the radially outer side of the insulator body 12a.

  The wall portion 12g protrudes from the radially outer edge of the insulator body 12a and extends along the circumferential direction of the insulator body 12a excluding the joint portion 12c. With this structure, an insulation distance between the motor cover 14 and the coil 8c is secured, the motor cover 14 reduces external noise, and the wall portion 12g can suppress the influence of falling objects from the outside. Note that the insulator 12 according to the fifth embodiment may further include the built-up portion 12p of the above-described embodiment.

(Embodiment 6)
FIG. 10A is a plan view illustrating a partially enlarged configuration of the insulator according to the sixth embodiment. 10-2 is a partially enlarged perspective view illustrating the configuration of the insulator illustrated in FIG. 10-1. FIG. 11 is a partially enlarged cross-sectional view of a joint portion of an insulator according to the sixth embodiment. Note that the same components as those described in the above-described embodiment are denoted by the same reference numerals, and redundant description is omitted.

  In the insulator 12 according to the sixth embodiment, the build-up portion 12p protrudes from the insulator main body 12a on both sides in the circumferential direction of the joint portion 12c, and extends from the base portion of the column portion 12b over which the coil 8c is spanned to the joint portion 12c. And the build-up part 12p is extended along the edge of the edge part which the insulator main body 12a which is the joint part 12c of the insulator 12 opposes. When the height (thickness in the direction parallel to the rotation center Zr shown in FIG. 1) of the built-up portion 12p extending along the joint portion 12c is H, the value of H (unit: mm) is shown below. It is preferable to satisfy the formula (1). Here, V is a voltage (unit: volt) applied to the conductor of the coil 8c.

  For example, the insulation of air is about 1000 volts / 1 mm. Since the height H of the built-up portion 12p that satisfies the above formula (1) has higher insulation than air, the reliability of the motor 8 according to the sixth embodiment can be improved.

  In the insulator 12 according to the sixth embodiment, when the shortest distance between both end portions in the circumferential direction of the insulator body 12a in the joint portion 12c is Δl, Δl preferably satisfies the following formula (2).

  Here, D indicates the diameter of the conductor of the coil 8c. Further, as shown in FIG. 11, the center of the cross section of the conductor of the coil 8c is arranged in the middle of the joint portion 12c (in the middle between both ends in the circumferential direction of the insulator body 12a), and the imaginary line on the outer periphery of the conductor of the coil 8c. Is passing through the corners of both end portions in the circumferential direction on the lower side (or upper side) of the insulator main body 12a, α indicating the approach angle is a virtual line at the center of the cross-section of the conductor of the coil 8c (the imaginary intermediate point of the joint portion 12c). The angle between the center of the cross section of the conductor of the coil 8c and the corners of the joint portion 12c (corners at both end portions in the circumferential direction of the insulator main body 12a) with respect to the line). Here, the approach angle α is preferably 30 ° or less. If the approach angle α is 30 ° or less, the shortest distance between both end portions in the circumferential direction of the insulator main body 12a at the joint portion 12c is Δl or less than ½ of the diameter of the coil 8c, and the coil 8c is connected to the joint portion 12c. It is possible to suppress the risk of entering between the circumferential end portions of the insulator body 12a.

  As described above, if the width in the circumferential direction of the joint portion 12c satisfying the expression (2) is Δl, the possibility that the coil 8c enters the joint portion 12c can be suppressed.

(Embodiment 7)
FIG. 12A is a plan view illustrating a partially enlarged configuration of the insulator according to the seventh embodiment. 12-2 is a partially enlarged perspective view showing the configuration of the insulator shown in FIG. 12-1. Note that the same components as those described in the above-described embodiment are denoted by the same reference numerals, and redundant description is omitted.

  The insulator 12 according to the seventh embodiment includes a pillar portion 12b including a pillar portion 12ba and a pillar portion 12bb on the build-up portion 12p, and is divided into a plurality of pieces. In other words, a plurality of support columns 12b protrude from one built-up portion 12p. In this embodiment, the support | pillar part 12b has two support | pillar parts 12ba and the support | pillar part 12bb protrude with respect to one build-up part 12p. The struts 12b are not limited to two for one build-up part 12p, and may be three or more.

  As shown in FIG. 12A, the coil 8c passes between the column portion 12ba and the column portion 12bb, and is wound around the column portion 12bb, for example. As described above, in the insulator 12 according to the seventh embodiment, the plurality of support column portions 12b protrude from the build-up portion 12p. Thereby, the coil 8c is prevented from being loosened. As a result, the coils 8c can be aligned.

(Embodiment 8)
FIG. 13 is a partially enlarged perspective view illustrating a joint portion of the insulator according to the eighth embodiment. The same components as those described in the above-described embodiment are denoted by the same reference numerals, and redundant description is omitted.

  The insulator main body 12a of the insulator 12 according to the eighth embodiment includes a joint portion 12cc that divides the insulator main body 12a at one place in the circumferential direction. One end portion in the circumferential direction of the insulator body 12a is bent through a bent portion 12k that bends the insulator body 12a in the height direction, extends from the bent portion 12k, and extends in the other circumferential direction of the insulator body 12a. An override portion 12m that rides on the end portion is provided. There may be no gap 12cd between the override portion 12m and the insulator body 12a where the override portion 12m overlaps in the direction parallel to the rotation center Zr shown in FIG. 1, but the insulation is improved by providing the gap 12cd. can do.

  With this structure, the insulator 12 can be divided into two by providing two joint portions 12cc in the circumferential direction of the insulator body 12a. The number of divisions may be two or more, and the joint portion 12 cc is two or more in the circumferential direction of the insulator 12. For example, the divided insulator main body 12a can be formed with the same mold by forming a point-symmetric shape with respect to the rotation center Zr. For this reason, although the insulator 12 can arrange | position the molded part of the same shape in the periphery shape and makes it a hollow annular shape, the joint part 12cc will arise between molded parts. The size of the mold of the insulator 12 decreases as the number of joint portions 12cc increases in the circumferential direction of the insulator body 12a. As a result, the manufacturing cost of the insulator 12 is reduced. However, when the coil 8c is wound so as to extend over the stators 8a having different phases, the coil 8c may be frayed at the joint portion 12cc. In the direct drive motor according to the eighth embodiment, fraying of the winding of the coil 8c can be suppressed by the tension of the coil 8c spanned over the support column 12b. As a result, the direct drive motor according to the eighth embodiment can reduce the cost of the insulator 12 that insulates the coil 8c from the stator 8a, and suppress the risk of fraying of the winding of the coil 8c.

  Further, the override portion 12m covers the joint portion 12cc and restricts the position of the coil 8c in the direction away from the stator 8a. Therefore, between the coil 8c on the joint portion 12cc and the lower stator 8a of the insulator body 12a, A sufficient insulation distance can be secured. This makes it possible to meet the demand for long-term stabilization of the rotational accuracy of the direct drive motor.

  Moreover, it is more preferable that the override portion 12m extends along the joint portion 12cc of the insulator 12. For this reason, the position of the coil 8c can be regulated in the direction away from the stator 8a regardless of the position where the coil 8c passes through the joint portion 12cc.

(Embodiment 9)
FIG. 14A is a partially enlarged plan view of the configuration of the insulator according to the ninth embodiment. FIG. 14-2 is a perspective view showing a partially enlarged configuration of the insulator shown in FIG. 14-1. The same components as those described in the above-described embodiment are denoted by the same reference numerals, and redundant description is omitted.

  In the insulator 12 according to the ninth embodiment, the built-up portion 12p protrudes from the insulator body 12a on both sides in the circumferential direction of the joint portion 12c, and extends from the base portion of the support column portion 12b over which the coil 8c is spanned to the outside of the outer diameter of the insulator body 12a. Exist. The build-up portion 12p does not extend to the circumferential end of the insulator body 12a, which is the joint portion 12c of the insulator 12. The built-up portion 12p is disposed on the insulator body 12a at a distance from the joint portion 12c of the insulator 12. The circumferential end of the insulator body 12a, which is the joint portion 12c, is lower than the height of the built-up portion 12p. And when the height of the build-up part 12p is set to H, it is preferable that the value (unit: mm) of H satisfy | fills Formula (3) shown below.

  However, the voltage applied to the conductor of the coil 8c is V (unit: volt), and θ in the equation (3) is L for the linear distance through the joint portion 12c of the adjacent built-up portion 12p, and the conductor of the coil 8c. When the diameter is D, the following formula (4) is satisfied.

  For example, the insulation of air is about 1000 volts / 1 mm. Since the height H of the built-up portion 12p that satisfies the above formula (3) is more insulative than air, the reliability of the motor 8 according to the ninth embodiment can be improved. Further, even if there is a linear distance L through the joint portion 12c between the adjacent built-up portions 12p, the motor 8 satisfying the equations (3) and (4) takes into account the bending of the coil 8c. The possibility that the coil 8c enters the portion 12c can be suppressed.

  In addition, the insulator 12 according to the ninth embodiment is provided with a holding portion Hp that positions and holds the hollow cylindrical spacer Sp at a predetermined position. It is preferable to provide an alignment adjustment surface 12s on the inner side in the radial direction of the holding portion Hp. The alignment adjustment surface 12s can suppress the possibility that the coil 8c wound around the winding portion 12e protrudes outward in the radial direction.

  Further, when the circumferential length of the alignment adjustment surface 12s is B and the circumferential length of the winding portion 12e is A, the circumferential length of the winding portion 12e is the circumferential length B of the alignment adjustment surface 12s. B / A, which is a ratio to the length A in the direction, is preferably 0.3 or more and 0.7 or less. Within this range, the alignment adjustment surface 12s provided on the inner side in the radial direction of the holding portion Hp can further align the coil 8c wound around the winding portion 12e. For example, the motor 8 according to the ninth embodiment can reduce the possibility that the winding of the coil 8c wound around the insulator 12 will fall to the holding part Hp side and disturb the winding alignment state.

4 Base 6 Rotating body 8 Motor 8a Stator (stator)
8b Rotor (permanent magnet)
8c Coil 12 Insulator 12a Insulator body 12b, 12ba, 12bb Strut part 12c, 12cc Seam part 12cd Gap 12e Winding part 12f Surrounding structure 12g Wall part 12k Bending part 12m Override part 12p Overlaying part 12s Alignment adjustment surface 16 Motor cover Fastening mechanism 16b Tapping screw Hp Holding part Sp Spacer

Claims (11)

Base and
A stator fixed to the base;
A rotor disposed opposite to the stator;
A coil wound around the stator;
A member that insulates the coil from the stator, and has a hollow annular insulator body, a seam portion that divides the insulator body in at least two locations in the circumferential direction of the insulator body, and a circumferential direction of the seam portion A direct drive motor including an insulator including on both sides, a built-up portion thicker than the insulator main body. The height H of the build-up portion is a direct drive motor that satisfies the condition of the following formula (1).

Here, V is a voltage applied to the conductor of the coil. When the shortest distance between both end portions in the circumferential direction of the insulator main body at the joint is Δl, the diameter of the coil conductor is D, and the entry angle is α, Δl satisfies the following formula (2): The direct drive motor according to claim 2.

  The direct drive motor according to claim 1, wherein a circumferential end portion of the joint portion is lower than a height of the build-up portion. The direct drive motor according to claim 1, wherein the height H of the build-up portion satisfies a condition of the following formula (3).

However, the voltage applied to the coil conductor is V, θ in the formula (3) is L, the linear distance through the seam portion of the adjacent built-up portions is D, and the coil conductor diameter is D. In this case, the following expression (4) is satisfied.

Base and
A stator fixed to the base;
A rotor disposed opposite to the stator;
A coil wound around the stator;
A member that insulates the coil from the stator, and includes an insulator main body that forms a hollow annular shape, and an insulator including a seam portion that divides the insulator main body in a circumferential direction of the insulator main body,
One end portion in the circumferential direction of the insulator body at the seam portion is a bent portion that bends the insulator body in the height direction, bends through the bent portion, and extends from the bent portion, and at the seam portion. A direct drive motor, further comprising: an override unit that rides on the other end in the circumferential direction of the insulator body. A motor cover for protecting the coil;
A fastening mechanism for fixing the motor cover and the base via a spacer;
The direct drive motor according to any one of claims 1 to 6, wherein the insulator includes a holding portion that positions and holds the spacer at a predetermined position. A motor cover for protecting the coil;
A fastening mechanism including a tapping screw for fixing the motor cover and the insulator;
The direct drive motor according to any one of claims 1 to 6, wherein the insulator includes a holding portion into which the tapping screw is screwed. The insulator includes a winding portion around which the coil is wound together with the stator,
The holding portion includes an alignment adjustment surface in which a radially inner surface of the holding portion is a plane,
9. The direct drive motor according to claim 7, wherein a ratio of a circumferential length of the alignment adjusting surface to a circumferential length of the winding portion is 0.3 or more and 0.7 or less.   A molded part that insulates the coil from the stator, the molded body is arranged in a circumferential shape to form a hollow annular shape, and a joint portion that divides the insulator body at at least two locations in the circumferential direction of the insulator body; An insulator including a thickened portion thicker than the insulator main body on both circumferential sides of the joint portion. The insulator according to claim 10 , wherein the molded part has a point-symmetric shape with respect to a center of the hollow annular shape.

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