JP2023104321A - rotary drive - Google Patents

Abstract

To provide a rotary drive that can prevent decrease in output torque and characteristic fluctuation by reducing heat generation, avoid decrease in life span and hindrance to maintenance, and contribute to further compactification (thinning).SOLUTION: A rotary drive comprises: a movable member Mm having a ring-shaped rotor yoke 5 and rotor magnets 4 in which multiple magnetic poles are arranged along the circumferential direction Ff of the rotor yoke 5; a fixed body Mc in which multiple stator cores 2c ... facing the movable member Mm are arranged at predetermined intervals on a ring-shaped stator 2 along the circumferential direction Ff; and a heat dissipation mold unit 9 in which at least part of stator coils 3 ... wound up around stator cores 2c ... is covered with an insulation covering material 7 with thermal conductivity, the insulation covering material 7 contacts at least part of the stator cores 2c ..., and the insulation covering material 7 contacts or approximates to the inner surface 8i of an outside-facing housing unit 8.SELECTED DRAWING: Figure 1

Description

The present invention relates to a rotary drive device including a fixed body portion having stator coils wound around a plurality of stator core portions and a movable body portion having a rotor magnet having a plurality of magnetic poles.

In general, rotation drive devices (servomotors) used in automatic looms, etc., need to be controlled frequently and at high speed during rotation, such as rotation start, rotation stop, rotation speed switching, rotation direction switching, etc. , It is required to reduce the moment of inertia as much as possible by reducing the weight of the rotor (movable part).

Conventionally, a direct electromagnetic drive rotary selvage device for a loom and a loom disclosed in Patent Documents 1 to 3 are known as rotary drive devices used for such applications. The direct electromagnetic drive rotary selvedge device for a loom disclosed in Patent Document 1 enables a relatively narrow structure of the selvedge device, and has a suitable bearing that can be incorporated into the selvedge device with a simple structure at low cost. A device must be found for leno discs, in which case the drive is equipped with an angle-of-rotation measurement system, and the electromagnetic drive, the bearing device and the angle-of-rotation measurement system are sufficiently protected against contamination. It is intended to solve the problem that must be shielded. A centering device is provided in the stator housing that is non-rotatably secured to the leno weave punch and is coaxially disposed about the rotor center axis and carries the inner race of the rolling bearing.

Further, in a direct electromagnetic drive rotary selvage device for a loom disclosed in Patent Document 2, a leno disc is the rotor of the direct electromagnetic drive device, and a magnetic flux different from the radial magnetic flux is generated between the rotor and the stator. The object of the present invention is to provide a narrow-width rotary selvedge device in which a appears in the driving device. and a leno disc rotatably supported for guiding the leno yarn supplied from the second leno bobbin through each yarn nozzle, the leno disc forming the rotor of the electromagnetic drive device, and the stator the loom A direct electromagnetic drive rotary selvage device for a loom contained in a housing connectable to a loom, wherein an axial magnetic flux exists between the rotor and the stator.

Furthermore, the loom disclosed in Patent Document 3 is characterized by its narrow width. The diameter of these rotating selvedge leno devices increases in the direction opposite to the drawing direction of the fabric being woven, and the leno yarns traverse the leading yarn eyelets of the rotor to form the entire leno selvedge, The two holding sides are connected by a lockable sliding seat and the holding side is arranged to be displaceably fixed to a stationary transverse axis by means of a clamping bush.

JP-A-11-107129 JP-A-11-117147 Japanese translation of PCT publication No. 2007-500804

However, the above-described conventional rotary drive device (direct electromagnetically driven rotary selvage device for loom, loom) has the following problems.

Firstly, since the rotor is supported by a dedicated rolling bearing configured to have a large diameter as a metal part, some parts such as the outer race of the rolling bearing that rotates together with the rotor must also be enlarged. Weight up. Therefore, there is a limit to reducing the moment of inertia by reducing the weight of the rotor and ensuring sufficient high-speed response. There is room for further improvement from the viewpoint of solving these problems.

Secondly, since structural elements such as leno-woven discs and magnets are arranged on the outer peripheral surface or the side surface of the rolling bearing, the overall structure becomes complicated and large-sized rolling bearings are required. , the thickness of the entire device increases. As a result, there is room for further improvement from the viewpoint of increasing versatility, such as being unable to meet the installation requirements in a narrow space of about 10 [mm].

Thirdly, in this type of rotary drive device, it is necessary to perform controls such as rotation start, rotation stop, rotation speed switching, rotation direction switching, etc. during rotation operation frequently and with high speed response. increases the heat generation of the rotary drive device as a whole, resulting in a decrease in output torque and characteristic fluctuations, as well as a reduction in service life and trouble in maintenance due to the high temperature of the rotary drive device. There were also difficulties from the point of view of

Fourthly, when a rotary drive device is used in a loom such as that disclosed in Patent Document 3, two large and small rotary drive devices must be arranged side by side in the selvage feeding direction, which complicates the entire loom. lead to enlargement. Moreover, assembly becomes complicated, such as the need for relative positional adjustment between the rotary drive devices. As a result, there is a problem in manufacturability, and there is a problem that the cost of the entire loom is increased.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rotary drive apparatus that solves the problems existing in the background art.

In order to solve the above-described problems, the rotary drive device 1 according to the present invention has a stator 2 integrally provided with a plurality of stator core portions 2c and stator coils 3 wound around the stator core portions 2c. When constructing a rotary drive device comprising a rotor magnet 4 having a plurality of magnetic poles facing the fixed body Mc and a movable body Mm having a rotor yoke 5 attached to the rotor magnet 4, the rotor magnet 4 is formed into a ring shape. and a rotor magnet 4 having a plurality of magnetic poles arranged along the circumferential direction Ff of the rotor yoke 5; At least a part of a fixed body portion Mc in which the portions 2c are arranged at predetermined intervals along the circumferential direction Ff and stator coils 3 wound around the stator core portions 2c are covered with an insulating coating material 7 having thermal conductivity. and the insulating coating material 7 is brought into contact with at least a part of the stator core portions 2c . . . characterized by comprising

In this case, according to a preferred aspect of the invention, the stator 2 is fixed in position with respect to the stator 2, and the roller peripheral surfaces 6f are brought into contact with the movable body portion Mm to turn the movable body portion Mm. A movable body support portion Ms composed of a plurality of support rollers 6 for freely supporting can be provided, and the support rollers 6 are formed by removing a part of the stator core portions of the plurality of stator core portions 2c. It can be arranged in the accommodation space Sc. On the other hand, the housing portion 8 can be configured by including a base portion 8s for fixing the one end surface 2s side of the stator 2 and a cover portion 8c for covering the other end surface 2t side of the stator 2 . At this time, the base portion 8s and/or the cover portion 8c are made of a material having a thermal conductivity higher than that of the insulating coating material 7, and the insulating coating material 7 is the coating material 2cc of the stator core portions 2c. . . and the stator coils 3 . . . In addition, the insulating coating material 7 can cover each coil 3 unit of the stator coils 3, or a plurality of coils 3, 3, . On the other hand, the housing portion 8 can be formed in a shape that covers at least part of the stator 2 via the ventilation space 51, and the housing portion 8 may be provided with air blowing means 52 for blowing air into the ventilation space 51. Alternatively, a heat exchange water pipe 53 arranged along the ventilation space 51 and a water passage means for passing water through the water pipe 53 may be provided. Furthermore, a plurality of blower fins 55 for blowing air as the movable body Mm moves can be attached to the outer surface Mmo of the movable body Mm. In addition, it is desirable that the movable body portion Mm is configured by providing a hollow portion Sa inside the inner peripheral portion.

According to the rotary drive device 1 according to the present invention having such a configuration, the following remarkable effects can be obtained.

(1) The movable body portion Mm has a ring-shaped rotor yoke 5 and a ring-shaped rotor magnet 4 in which a plurality of magnetic poles are arranged along the circumferential direction Ff of the outer periphery of the rotor yoke 5. Therefore, the movable body portion Mm It is possible to eliminate the conventional large rolling bearings that swivel. As a result, it is possible to significantly reduce the weight of the movable body portion Mm, and it is possible to reduce the moment of inertia while supporting high torque. Cost efficiency and energy saving can be further improved.

(2) A fixed body portion Mc in which a plurality of stator core portions 2c . and a plurality of support rollers which are fixed in position with respect to the stator 2 and rotatably support the movable body portion Mm by bringing the roller peripheral surfaces 6f into contact with the outer peripheral portion or the inner peripheral portion of the movable body portion Mm. Since the movable body supporting portion Ms consisting of 6 is provided, the overall structure can be simplified, and in particular, the thickness of the entire device can be reduced. As a result, it is possible to provide the rotary drive device 1 with excellent versatility and expandability, such as being able to sufficiently meet installation requirements in narrow spaces where the interval is about 10 [mm] or less. can.

(3) At least a portion of the stator coils 3 wound around the stator core portions 2c are covered with an insulating coating material 7 having thermal conductivity, and the insulating coating material 7 is applied to at least a portion of the stator core portions 2c. Since the heat radiation mold portion 9 is provided in which the insulating coating material 7 is brought into contact with or close to the inner surface 8i of the housing portion 8 facing the outside, the heat radiation in the rotary drive device 1 can be effectively and efficiently performed. , the stator coils 3 . As a result, it is possible to prevent a decrease in output torque and fluctuations in characteristics due to heat generation. Moreover, it is possible to avoid a decrease in the service life of the rotation drive device 1 and troubles in maintenance due to a rise in temperature, and it is possible to contribute to the realization of further miniaturization (thickness).

(4) Since the rotary drive device 1 can be constructed with a smaller overall thickness in the axial direction than the overall length in the radial direction, for example, two rotary drive devices 1, 1 can be combined to construct Even when used in a loom equipped with a selvage drive device, the same rotary drive devices can be arranged in piles in the axial direction. Therefore, the size and simplification of the loom as a whole can be realized, and relative positional adjustment between the rotary drive devices 1, 1 can be made unnecessary or extremely easy. Moreover, it is easy to assemble, and is excellent in ease of production and low cost.

(5) According to a preferred embodiment, the stator 2 is fixed in position with respect to the stator 2, and the roller peripheral surfaces 6f are brought into contact with the movable body Mm to rotatably support the movable body Mm. If a movable body support portion Ms consisting of a plurality of support rollers 6 is provided, general-purpose parts such as ball bearings that are small and light and have various variations can be used as the support rollers 6. A high-performance rotary drive device 1 can be obtained easily and at low cost.

(6) According to a preferred embodiment, when the support rollers 6 are arranged in the housing space Sc formed by removing a part of the stator core portions 2c of the plurality of stator core portions 2c, each support roller can be 6 can be arranged at the same position as the stator core portions 2c in the axial direction. can realize rational thinning of the rotary drive device 1 .

(7) According to a preferred embodiment, when constructing the housing portion 8, if the base portion 8s for fixing the one end surface 2s side of the stator 2 and the cover portion 8c for covering the other end surface 2t side of the stator 2 are provided, Since the base portion 8s can function as a part of the mechanical component of the fixed body portion Mc, it can be used as a mounting functional portion when arranging a circuit board or the like or when installing the rotary drive device 1. In addition, even when the cover portion 8c is used in a place where dust is likely to be generated, for example, when it is used in an automatic loom or the like, dust generated based on lint or the like is prevented from entering the rotary drive device 1 from the dustproof cover 17 side. can be prevented from entering the interior of the rotary drive device 1, it is possible to contribute to the improvement of the reliability and durability of the rotary drive device 1.

(8) According to a preferred embodiment, if the base portion 8s and/or the cover portion 8c constituting the housing portion 8 are made of a material having a thermal conductivity higher than that of the insulating coating material 7, the insulating coating material Since the heat generated in the interior transmitted to 7 can be reliably radiated to the atmosphere, an effective and efficient cooling effect can be ensured.

(9) According to a preferred embodiment, if the insulating coating material 7 is made of a material having a thermal conductivity higher than that of the coating material 2cc of the stator core portions 2c and the coating material of the stator coils 3, the stator coil Since the heat generated by 3 can be efficiently transmitted to the insulating coating material 7, an effective heat dissipation effect can be ensured.

(10) According to a preferred embodiment, if the insulating coating material 7 covers each coil 3 unit or a plurality of coils 3, 3 . . . in the stator coils 3 . Since the covering mode can be selected according to the shape or the like, the degree of freedom in designing the rotary drive device 1 can be increased, and the heat dissipation effect can be optimized.

(11) According to a preferred embodiment, if at least a portion of the stator 2 is covered with the ventilation space 51 when constructing the housing portion 8, the ventilation space can be easily created by changing the shape of the housing portion 8 itself. 51 can be secured, an effective cooling function using this ventilation space 51 can be constructed.

(12) According to a preferred embodiment, if the air blowing means 52 for blowing air into the ventilation space 51 is attached to the housing portion 8, an air cooling function can be constructed by the ventilation space 51 and the air blowing means 52, so that an effective cooling function can be ensured. .

(13) According to a preferred embodiment, if the housing portion 8 is provided with a water pipe 53 for heat exchange arranged along the ventilation space 51 and a water passage means for passing water through the water pipe 53, the ventilation space 51 can be Since a water cooling function can be constructed by adding the water pipe 53 and the water flow means, a cooling function with a higher cooling effect can be realized.

(14) According to a preferred embodiment, if a plurality of air blowing fins 55 for blowing air as the movable body Mm moves are attached to the outer surface Mmo of the movable body Mm, it becomes possible to blow air radially outward, for example. Therefore, the heat dissipation effect can be further enhanced.

(15) According to a preferred embodiment, if the hollow portion Sa is provided inside the inner peripheral portion of the movable body Mm, it can be constructed as a so-called inner rotor type. The moment can be reduced, the current (electric power) in excessive deceleration can be reduced, and the heat dissipation area of the stator 2 can be expanded. In particular, it is most suitable for use in an automatic loom or the like that feeds threads or the like using the hollow portion (space) Sa.

1 is a front view of a rotary drive device according to a preferred embodiment of the present invention, including a partially extracted enlarged cross-sectional view, excluding a cover; A vertical cross-sectional side view including a partially extracted enlarged view of the same rotary drive device, A partial configuration view including a partially broken portion showing a modified example of the heat radiation mold portion of the same rotary drive device as seen from the front direction, A principle configuration diagram including an air cooling function attached to the rotary drive device, A vertical cross-sectional side view showing a sensor substrate part and a detected part including a partially extracted enlarged view of the same rotary drive device, Explanatory diagram of the detection principle of the sensor substrate and the detected part of the rotary drive device, Front view of a middle ear drive device in a direct electromagnetic drive rotary ear fabric system for a loom, showing an example of use of the same rotary drive device; Side view of the same middle ear driving device, A time chart showing changes in the number of revolutions in the same middle ear driving device, Temperature change characteristic diagram of the same rotary drive device, A partial configuration diagram of an outer rotor type showing a modified example of the rotary drive device viewed from the side,

Next, preferred embodiments according to the present invention will be presented and explained in detail based on the drawings.

First, the configuration of the rotary drive device 1 according to the present embodiment will be described with reference to FIGS. 1 to 6 and 10. FIG.

FIG. 1 shows the overall structure of the mechanical portion of the rotary drive device 1. As shown in FIG. The rotary drive device 1 is roughly composed of a fixed body portion Mc, a movable body portion Mm, and a movable body support portion Ms.

The fixed body portion Mc includes a stator 2 shown in FIG. 1 integrally formed in a ring shape as a whole. For the stator 2, a laminate obtained by laminating a plurality of non-oriented electromagnetic steel sheets such as silicon steel sheets can be used. Eddy current loss can be effectively reduced by using such a stator 2 . In this case, since the non-oriented electrical steel sheet has slight magnetic directionality depending on the manufacturing conditions such as the rolling direction, the magnetic directionality can be eliminated by the rolling method when manufacturing the laminate. . That is, in the case of a three-phase motor, the stator 2 has stator core portions 2c and housing spaces Sc, which will be described later, due to the shape of 120° rotational symmetry. At this time, a rolling mark (a small notch or the like) is provided on the outer circumference of the stator 2 so that it is possible to visually confirm that the rolling is securely carried out. Moreover, the stator 2, which is laminated and fixed by caulking or the like, is desirably subjected to magnetic annealing in order to remove working strain.

The stator 2 has, as shown in a partially extracted enlarged cross-sectional view indicated by a dashed-dotted line circle A in FIG. It integrally has a plurality of stator core portions 2c. It is desirable that the width dimension of the stator core portion 2c in the axial direction Fs is selected to be approximately 0.8 times or less than the width dimension of the rotor magnet 4 in the axial direction Fs, which will be described later. With this selection, the magnetic attraction force between the rotor magnet 4 and the stator core portion 2c can be made uniform, so that the movable body portion Mm, which will be described later, can be stably held at the magnetic center position.

Each stator core portion 2c faces the outer peripheral portion of the movable body portion Mm with a slight gap therebetween. In the example, the pitch (interval) between the stator core portions 2c is selected so that the number of poles of the stator core portions 2c is twenty-four when the interval is set constant. Arrangement patterns are sequentially provided in which the accommodation space Sc is formed by leaving the stator core portions 2c . . . remaining and removing the next stator core portion 2c. Thus, the entire stator core portions 2c are set to have 18 poles, and six housing spaces Sc are provided at regular intervals in the circumferential direction Ff. In addition, three stator core portions 2c are present between the accommodation spaces Sc and Sc. As a phase brushless motor, the rotation can be controlled by pulse width modulation drive control (PWM drive control) (see FIG. 4).

In particular, when two rotary drive devices 1 (1x) and 1 (1y) are arranged in parallel, such as the middle ear drive device (see FIG. 8) in the direct electromagnetic drive rotary ear system for looms. is preferably made of a soft magnetic iron material, which will be described later, in order to reduce crosstalk due to electromagnetic noise between the rotary drive devices 1x and 1y. In this case, the generated high-frequency electromagnetic noise (crosstalk) can be shielded to prevent malfunction.

Furthermore, as shown in FIG. 2, at least the winding portions of the stator core portions 2c of the stator 2 are electrodeposited with epoxy resin, polyimide resin, or the like so as to have a layer thickness of several tens to several hundreds [μm]. 2 cc of coating material is applied as an insulating coating. The stator core portions 2c are provided with stator coils 3 wound with coil wires (magnet wires) using insulated conductors. A coil wire is generally coated with an insulating coating of several tens of μm such as polyurethane resin or polyester resin on the outer periphery of a copper wire to prevent electrical short circuit.

On the other hand, one end surface 2s (back side) of the fixed body portion Mc is provided with a ring-shaped base portion 8s. The base portion 8s is desirably integrally formed of an aluminum material having high thermal conductivity (heat dissipation) and non-magnetism. As shown in FIG. 2, the base portion 8s supports the stator 2 by overlapping one end surface 2s of the stator 2 and fixing with a fixing screw (not shown). A movable body supporting portion Ms is provided.

In this manner, if the fixed body portion Mc is provided with the ring-shaped base portion 8s for supporting the one end surface 2s of the stator 2 and for disposing the movable body support portion Ms, the base portion 8s can be used as the fixed body portion Since it can be made to function as a part of the mechanical components of Mc, it can be used not only for supporting rollers 6, which will be described later, but also for mounting a housing function part for disposing a circuit board and the like, and when installing the rotation driving device 1. It can be used as a functional part or the like.

A cover portion 8c is provided on the other end surface 2t (front side) of the fixed body portion Mc to cover the other end surface 2t side. The cover portion 8c is made of an aluminum material having high thermal conductivity (heat dissipation) and non-magnetism. Note that when two rotary drive devices 1, 1 are stacked in the axial direction Fs like the middle ear drive device in an automatic loom, crosstalk due to electromagnetic noise between the rotary drive devices 1, 1 may occur. In order to reduce it, it is desirable to form it with a soft magnetic iron material. If such a cover portion 8c is provided, even when used in a place where dust is likely to be generated, for example, when used in an automatic loom or the like, dust generated from lint or the like can be prevented from the cover portion 8c side. Since entry into the rotary drive device 1 can be prevented, the reliability and durability of the rotary drive device 1 can be improved.

The base portion 8s and the cover portion 8c are fixed by fixing screws 61 (see FIG. 7) to form an integrated housing portion 8. As shown in FIG. The housing portion 8 also serves as a casing for the rotary drive device 1 , and the outer surface of the base portion 8 s and the outer surface of the cover portion 8 c are located at the outermost portion of the rotary drive device 1 , that is, the portion facing the outside.

By the way, the coating material 2cc of the stator core portions 2c and the coating material of the stator coils 3 described above usually have a thermal conductivity of 0.2 [W/(m·K )], so when heat is generated by energization, the problem is how to dissipate this heat.

In order to solve this problem, in the present invention, as shown in FIG. 1, at least a portion, preferably all, of the stator coils 3 wound around the stator core portions 2c are covered with an insulating coating material 7 having thermal conductivity. and the insulating coating material 7 is brought into contact with at least a part of the stator core portions 2c . . . established.

Various resin materials such as modified silicon resin material and modified epoxy resin material are desirable for the insulating coating material 7, and in particular, a resin material in which alumina or metal is dispersed for the purpose of heat dissipation is desirable, and thermal conductivity is dramatically improved. can be enhanced. As an example, in the case of a resin material in which alumina is dispersed, the thermal conductivity can be increased by about one order of magnitude. The coating with the insulating coating material 7 can be carried out by insert molding by injection molding, a coating process, or the like.

The partially extracted enlarged cross-sectional view indicated by the dashed-dotted line circle A in FIG. In the illustrated case, the layer thickness of the heat dissipation mold portion 9 is approximately 1 [mm]. 1 shows an example in which each coil 3 of the stator coils 3 . . . is covered with the insulating coating material 7. In FIG. On the other hand, as in the modification shown in FIG. 3, it is also possible to coat a plurality of coils 3, 3, . . . FIG. 3 shows an example in which three coils 3, 3, 3 are covered. In this case, the gaps between the coils 3 and 3 are also filled with the insulating covering material 7. FIG. In this way, the insulating coating material 7 can cover each coil 3 unit or a plurality of coils 3, 3 . The covering mode can be selected according to the shape and the like. As a result, the degree of freedom in designing the rotary drive device 1 can be increased, and the heat dissipation effect can be optimized.

Moreover, it is desirable that the insulating coating material 7 uses a material having a thermal conductivity higher than that of the coating material 2cc of the stator core portions 2c and the coating material of the stator coils 3 . As a result, the heat generated by the stator coils 3 can be efficiently transmitted to the insulating coating material 7, so that an effective heat dissipation effect can be ensured.

Further, as shown in a partially extracted enlarged view indicated by a dashed-dotted line circle B in FIG. 2, the insulating coating material 7 of the heat dissipation mold portion 9 is brought into contact with or close to the inner surface 8i of the housing portion 8 facing the outside. The example of FIG. 2 shows a case where the insulating coating material 7 is brought into contact with the inner surface 8i of the base portion 8s and the inner surface 8i of the cover portion 8c. It should be noted that, although it is desirable to bring them into contact with each other in this way, it is not an absolute condition, but may be brought close to each other with a slight gap if necessary. In this case, the gap is desirably 0.5 [mm] or less.

Therefore, the base portion 8 s and the cover portion 8 c that constitute the housing portion 8 are made of a material having a higher thermal conductivity than the insulating coating material 7 . In the illustrated case, both the base portion 8s and the cover portion 8c are made of an aluminum material with high heat dissipation (thermal conductivity). Due to such material conditions, the internal heat transferred to the insulating coating material 7 can be reliably radiated to the atmosphere, so that an effective and efficient cooling effect can be ensured.

In addition, in the present embodiment, as shown in FIGS. 2 and 4, when configuring the housing portion 8 described above, the stator 2 is formed in a shape that covers at least a portion of the stator 2 via the ventilation space 51 . In this case, since the housing portion 8 is configured by combining the base portion 8s and the cover portion 8c, for example, by changing the shape of the base portion 8s (the cover portion 8c) as shown in FIG. A ventilation space 51 can be formed along the . Since the ventilation space 51 can be easily secured by changing the shape of the housing portion 8 itself, an effective cooling function using the ventilation space 51 can be constructed.

In FIG. 2, a blowing means 52 for blowing air into the ventilation space 51 is attached to the housing portion 8, and air can be blown into the ventilation space 51 from an external blower through a blowing pipe 52p (see FIG. 4). In this manner, since the air cooling function can be easily constructed by the ventilation space 51 and the air blowing means 52, an effective cooling function can be ensured. In FIG. 4, the dotted arrow indicates the air blowing path. As shown in FIG. 11, exhaust ports 51e for exhausting air from the ventilation space 51 can be provided at positions 180[°] opposite to the blower pipe 52p.

In addition, as shown in the partially extracted enlarged view indicated by the dashed-dotted line circle C in FIG. It is also possible to attach water passage means for In this way, if the water pipe 53 for heat exchange arranged along the ventilation space 51 and the water flow means for passing water through the water flow pipe 53 are attached, the water flow pipe 53 and the water flow means are added to the ventilation space 51. By doing so, a water cooling function can be constructed, and a cooling function with a higher cooling effect can be realized.

On the other hand, the movable body portion Mm includes a ring-shaped rotor yoke 5 and a ring-shaped rotor magnet 4 having a plurality of magnetic poles arranged along the outer circumference of the rotor yoke 5 in the circumferential direction Ff.

In this case, as shown in FIG. 4, the rotor magnet 4 is a ring-shaped integrally molded magnet that is divided and magnetized into 32 poles in the circumferential direction Ff. If such a rotor magnet 4 is used, it is not necessary to assemble a plurality of individual magnets. 4 can be made thinner, which can contribute to a further reduction in the moment of inertia by reducing the weight of the movable body portion Mm.

The rotor yoke 5 is integrally formed into a ring shape as a whole from a soft magnetic material such as iron. In this case, the rotor yoke 5 is formed thinner than the rotor magnet 4 . By forming in this way, the weight of the rotor magnet 4 can be reduced while avoiding the saturation of the magnetic circuit by the divided magnetization of the plurality of poles. can be implemented as an optimum form when configuring the movable body part Mm. Then, the rotor magnet 4 can be assembled so that the inner peripheral portion of the rotor magnet 4 is in contact with the outer peripheral portion of the rotor yoke 5 .

Further, the movable body portion Mm includes a rotor holding portion 13 shown in FIG. 5 (FIG. 2) that holds the rotor magnet 4 and the rotor yoke 5 . The illustrated rotor holding portion 13 is configured by a combination of an inner ring portion 13a and an outer ring portion 13b. Each of the ring portions 13a and 13b is integrally formed into a ring shape using a lubricating synthetic resin having a small moment of inertia, a small wear load, and excellent wear resistance. As the lubricating synthetic resin, fluorine resin, cast nylon resin, ultra-high molecular weight polyethylene resin, polyacetal resin, etc. can be used. In addition, instead of lubricating synthetic resin, if a non-magnetic metal with a small specific gravity, such as a magnesium alloy, is used, a moment of inertia close to that of a resin material can be obtained. You can enjoy the benefits.

As described above, when forming the rotor holding portion 13 (the inner ring portion 13a and the outer ring portion 13b), if the entire rotor holding portion 13 is made of a lubricating synthetic resin material, the physical properties of the lubricating synthetic resin material can be utilized, so that the rotor holding portion 13 can be moved. Smooth rotation (movability) of the body Mm can be realized, and vibration and noise during the rotation operation (movement) can be effectively absorbed. In the illustrated case, the entire rotor holding portion 13 (entirely) is integrally formed of a lubricating synthetic resin material. (Non-magnetic metal material, etc.) can also be used.

As shown in FIG. 5, the inner ring portion 13a is integrally formed with a ring main body portion 14d that holds the inner peripheral surface of the rotor yoke 5 and one end edge of the ring main body portion 14d in the axial direction Fs. It is composed of a ring-shaped side portion 14p that holds one end face (front side) of the rotor magnet 4 and the rotor yoke 5. As shown in FIG. The outer ring portion 13b is integrally formed with a ring-shaped ring main body portion 14u that holds the outer peripheral surface of the rotor magnet 4, and the edge of the ring main body portion 14u on the other side in the axial direction Fs. 4 and a ring-shaped side portion 14q that holds the other end face (back side) of the rotor yoke 5. As shown in FIG.

Further, rail portions 14pr and 14qr projecting upward are integrally formed at the upper end positions of the side portions 14p and 14q, respectively. to form As a result, the rail grooves 15 can be engaged with the support rollers 6 . In the case of the embodiment, yarn guides 31U and 31L are provided at positions spaced apart by 180° on the inner peripheral surface of the rotor holding portion 13 (see FIG. 7).

In this way, when the movable body portion Mm is configured, if the rail grooves 15 are provided, the relative displacement of the movable body portion Mm with respect to the fixed body portion Mc in the axial direction Fs is restricted by the magnetic force, but is prevented by the disturbance. In the event that mechanical displacement occurs due to actions such as these, the rails 14pr and 14qr restrict the movement of the movable body Mm from the fixed body Mc. and reliability can be further enhanced.

On the other hand, the movable body support portion Ms is composed of three support rollers 6 whose positions are fixed with respect to the stator 2 . In this case, as shown in FIG. 1, roller support shafts 6s for rotatably supporting the centers of the support rollers 6 are attached to the base portion 8s, and the support rollers 6 are arranged 120 degrees apart in the circumferential direction Ff. The arrangement position is selected so that it can be accommodated in the above-mentioned three accommodation spaces Sc positioned at intervals of [°], and furthermore, the roller peripheral surface 6f of the support roller 6 abuts on the outer peripheral portion of the movable body portion Mm. The outer diameter and the like of the support roller 6 are selected as follows.

The three support rollers 6 have a function of supporting the movable body Mm so as to be rotatable by bringing the peripheral surfaces 6f of the rollers into contact with the outer periphery of the movable body Mm. By considering the number of the portions 2c, etc., generally, it can be composed of a plurality of support rollers 6, which is three or more. When the support rollers 6 are arranged at four or more locations, the three support rollers 6, which are the minimum number, are used as a reference, and a slight gap (about several tens [μ]) with respect to the movable body portion Mm is provided. By arranging them, assembly is facilitated, and furthermore, by taking into consideration the direction of large vibration and the direction of gravity in the main body of a loom or the like to which the rotary drive devices 1 are attached, a more stable rotary motion can be obtained. be able to.

A radial bearing such as a ball bearing or a roller bearing is used for each supporting roller 6 . If radial bearings are used as the support rollers 6, general-purpose parts such as ball bearings that are compact, lightweight, and have various variations can be used, so that the intended rotary drive device 1 with higher performance can be obtained easily and at low cost. can be done. Although it is desirable to use radial bearings for the support rollers 6, if they are made of a soft magnetic material, non-magnetic bearings made of a resin material with good slidability such as ultra-high molecular weight polyethylene or polyacetal may be used. By fixing the resin sleeve to the outer circumference of the radial bearing, it is possible to reduce cogging due to the magnetic attraction force generated with respect to the rotor magnet 4 . In this case, it is desirable to set the magnetic air gap between the rotor magnet 4 and the radial bearing larger than the magnetic air gap between the rotor magnet 4 and the stator cores 2c.

Further, in order to further reduce cogging, the radial bearings may be made of a ceramic material, or the radial bearings may be omitted and the support rollers 6 may be made up of only the resin sleeves described above. As a result, cogging caused by the support rollers 6 can be substantially eliminated even when the rotor magnet 4 is made of sintered anisotropic neodymium magnets that generate a strong magnetic force.

On the other hand, when the support roller 6 is attached to the base portion 8s, the attachment screw 23 and the collar 24 constitute the roller support shaft portion 6s. By inserting the 23, it can be screwed into the screw hole formed in the base portion 8s.

In this manner, the stator 2 is provided with a plurality of supports which are fixed in position with respect to the stator 2 and rotatably support the movable body portion Mm by bringing the peripheral surfaces 6f of the rollers into contact with the movable body portion Mm. If the movable body support portion Ms composed of the rollers 6 is provided, general-purpose parts such as ball bearings, which are small and lightweight and have various variations, can be used as the support rollers 6. The driving device 1 can be obtained easily and at low cost.

In arranging the support rollers 6, if they are arranged in the housing space Sc formed by removing a part of the stator core portions 2c in the plurality of stator core portions 2c, each of the support rollers 6 is arranged in the stator core in the axial direction. Since it can be arranged at the same position as the portions 2c, unnecessary projection in the radial direction and the axial direction Fs by the support rollers 6 can be avoided, and the movable body portion Mm and furthermore the rotation drive device 1 can be rationalized. thinness can be realized.

Of the six housing spaces Sc, three housing spaces Sc were used as housing spaces Sc for the support rollers 6, but the remaining three housing spaces Sc were used as detection system installation spaces, As shown in FIGS. 5 and 1, a sensor substrate portion 62 and magnetic pole sensors 63 and 64 can be arranged. The magnetic pole sensors 63 and 64 shown in FIG. 1 are not used in this embodiment, but can detect the positions of the magnetic poles of the rotor magnet 4 .

As shown in FIG. 5, the sensor board portion 62 includes a support portion 65 whose position is fixed with respect to the base portion 8s, and a printed circuit board 66 fixed to the support portion 65. The printed circuit board 66 has two Two reflective optical sensors (67, 68) are implemented. In this case, one sensor functions as the origin sensor 67 and the other sensor functions as the encoder sensor 68 . The origin sensor 67 has one light-emitting portion and one light-receiving portion, and outputs an origin signal Z. FIG. The encoder sensor 68 has one light-emitting portion and three light-receiving portions arranged at equal pitches with different phases. 90[°]) is output. This logic synthesis is for reducing the error by averaging the output from the two light receiving sections. to obtain a signal A, and by comparing Q-(P+R)/2 to obtain a signal B, the direction of rotation can also be detected.

On the other hand, a detected portion 71 that is detected by the sensors 67 and 68 is provided on the outer peripheral surface of the rotor holding portion 13 described above. In this case, the upper surface of one rail portion 14pr of the rotor holding portion 13 is formed into a flat surface along the circumferential direction, and a reflective mark 72 shown in FIG. 6B is provided at one location in the circumferential direction. As a result, the origin sensor 67 detects the absolute position called the Z-phase by means of the reflective mark 72, ie, once per revolution. Further, the upper surface of the other rail portion 14qr of the rotor holding portion 13 is formed into a flat surface along the circumferential direction, and on this flat surface, reflective marks 73c and non-reflective marks 73n shown in FIG. 6(a) are formed. is provided in a repeating pattern 73 in which . This repeating pattern 73 is provided over 360[°] in the circumferential direction, and the number of repetitions is 360 in the example. A repeating pattern 73 is detected by each encoder sensor 68 .

In the light-emitting portion of the optical sensor, a light-emitting element with an infrared wavelength is usually used in many cases. It is desirable to form a reflective/non-reflective pattern by forming irregularities on the outer periphery or by painting separately. It is desirable to form a reflective/non-reflective pattern by coating with paint separately or by metal plating after forming irregularities. By providing such a pattern inside the thin rotary drive device 1, the ABZ encoder signal can be detected.

Next, an example of the manufacturing procedure of the rotary drive device 1 according to the present embodiment will be described with reference to each drawing.

First, an unmagnetized rotor magnet 4 is fixed to the rotor yoke 5 . In this case, the rotor yoke 5 and the rotor magnet 4 are positioned and fixed using an adhesive or the like. Then, the magnetization process is performed on the unmagnetized rotor magnet 4 fixed to the rotor yoke 5 .

Next, the inner ring portion 13a is attached to one end side of the integrated rotor yoke 5 and rotor magnet 4 using an adhesive or the like. Further, the outer ring portion 13b is attached to the rotor yoke 5 and the other end side of the rotor magnet 4 using an adhesive or the like. This completes the assembly of the movable body intermediate assembly on the side of the movable body portion Mm.

On the other hand, a coil wire is wound around each stator core portion 2c of the stator 2. As shown in FIG. As a result, the stator coils 3 are attached to the respective stator core portions 2c. Also, the printed circuit board 66 and the like are attached to the base portion 8s. Then, the stator 2 is attached to the base portion 8s, and the stator coils 3 of the stator 2 are connected to the printed circuit board 66 or the like by soldering or the like. This completes the assembly of the fixed body intermediate assembly on the side of the fixed body portion Mc.

The movable intermediate assembly is then set in place with respect to the fixed intermediate assembly. In this state, the three support rollers 6 are accommodated in the respective accommodation spaces Sc, and the support rollers 6 are attached to the base portion 8s. The support roller 6 is attached by inserting the collar 24 into the inner hole of the support roller 6 and inserting the attachment screw 23 through the collar 24 to screw it into the screw hole formed in the base portion 8s. As a result, each support roller 6 constitutes a movable body support portion Ms that is rotatably supported by a roller support shaft portion 6s formed by the mounting screw 23 and the collar 24 . After that, if the cover portion 8c and the base portion 8s are attached using the fixing screws 61, the desired rotary drive device 1 can be obtained.

The rotary drive device 1 configured as described above rotates as a three-phase DC brushless motor by connecting the stator coils 3 and sensors (not shown) to a drive controller (not shown) through the circuit board 22. be able to. In this case, the stator coils 3 for each phase can be connected by a known connection method such as star connection or delta connection. In addition, although the three-phase system has been exemplified, various multi-phase systems such as two-phase, four-phase, and five-phase systems can be used. The dimensions of the rotary drive device 1 shown in the embodiment are 150 [mm] for the outer diameter, 80 [mm] for the inner diameter (diameter of the hollow portion Sa), and 10 [mm] for the thickness (width dimension) in the axial direction Fs. mm].

7 and 8 show an example of a case where the rotary drive device 1 is used as the middle ear drive device Mu in a direct electromagnetic drive rotary selvage system for a loom. installed in the As shown in FIG. 8, this middle ear driving device Mu is installed side by side so that two rotary driving devices 1, 1 overlap in the axial direction Fs with a slight gap therebetween. Reference numeral 82 denotes a heald for separating the warp threads vertically.

The middle ear drive unit Mu has a function of entangling the selvage thread with the weft thread in order to prevent the fabric from unraveling to both sides in the traveling direction. The middle selvedge is intended to improve productivity by entangling the weft and selvage threads at two points in the central portion of the feeding direction of a wide fabric, and by making it possible to form two rolls of fabric at the same time. The device Mu is used by disposing it between the warp threads.

Since woven fabrics and knitted fabrics are usually composed of warp and weft, the warp is alternately moved up and down by a heald, and the weft is threaded near the top dead center and bottom dead center of the heald, but the ends come loose. For this reason, the selvedge threads are entangled with the weft threads at the ends to prevent unraveling. Therefore, since the rotary drive devices 1 cannot be installed unless the overall width is kept within about 20 [mm], conventionally, as in the above-mentioned Patent Document 3, two rotary devices are installed in front and rear in the feeding direction of the fabric. The drives are arranged in series.

The middle ear driving device Mu shown in the present embodiment uses two rotational driving devices 1 having a width of 10 mm, and as shown in FIG. The devices 1, 1 are arranged side by side so as to overlap with each other with a small gap therebetween. That is, one of the two identical rotary drive devices 1, 1 is used as the rotary drive device 1x for the selvage yarns Ta, Tb, and the other is used as the rotary drive device 1y for the selvage yarns Tc, Td. In this case, the selvage yarns Ta, Tb, Tc, and Td are supplied from bobbins (not shown), respectively, and the selvage yarns Ta, Tb are supplied from the upstream side of one rotary drive device 1x to the downstream side through the yarn guides 31U and 31L. At the same time, the selvage yarns Tc and Td are supplied from the upstream side of the other rotary drive device 1y to the downstream side through the yarn guides 31U and 31L.

Each of the rotary drive devices 1x and 1y is driven and controlled at a rotational speed R as shown in FIG. That is, from a stopped state, the rotational speed ru increases due to rapid acceleration, then the rotational speed rd decreases due to rapid deceleration, and then one cycle tc is repeated, in which the motor stops for a fixed time rs. In the meantime, selvage yarn Ta and selvage yarn Tb are reversed in vertical position by 180[°] unit (180[°] rotation due to acceleration and deceleration), and can be entangled with the weft. After repeating this operation about 20 times, the direction of rotation is reversed and the same operation is performed. It should be noted that the constant stop time rs is a concept that includes not only the original stop state in which the speed is 0, but also the low speed state in which the speed is very low (about 1/5 or less of the maximum speed).

In this way, the rotary drive device 1 shown in the embodiment can be constructed with a thickness in the axial direction that is smaller than the overall length in the radial direction. Even when used in a loom equipped with a middle ear drive unit Mu constructed by combining the rotary drive units 1, 1, the same rotary drive units can be stacked in the axial direction. Therefore, the size and simplification of the loom as a whole can be realized, and relative positional adjustment between the rotary drive devices 1, 1 can be made unnecessary or extremely easy. Moreover, it is easy to assemble, and is excellent in ease of production and low cost. Furthermore, since it is configured as an inner rotor type in which the movable body portion Mm is arranged inside the fixed body portion Mc, the moment of inertia of the movable body portion Mm can be reduced, the current (electric power) during acceleration and deceleration can be reduced, and the heat dissipation of the stator 2 can be achieved. The area can be expanded. Therefore, it is particularly suitable for use in an automatic loom or the like that feeds threads or the like using the hollow portion (space) Sa.

FIG. 10 shows the temperature change characteristics of the rotation drive device 1 shown in the embodiment, that is, the temperature rise [° C.] characteristics with respect to the elapsed time [s] (applied voltage 16 [V], drive current 2 [A]). . In FIG. 10, Pic and Pim show the temperature change characteristics of the rotary drive device 1 according to the present embodiment provided with the mold portion 9, and Prc and Prm show the conventional type without the heat dissipation mold portion 9 as a comparative example. shows the temperature change characteristics of the rotary drive device of Pic and Prc indicate the surface temperature of the stator coil 3 or the mold portion 9, and Pim and Prm indicate the outer surface temperature of the base portion 8s.

As is clear from FIG. 10, for example, when the mold portion 9 is not provided, the surface temperature of the mold portion 9 in the stator coil 3 is 37.4[° C.] and the base portion 8s rises to about 22.7[° C.], but in the case of this embodiment in which the mold portion 9 is provided, the rise in the surface temperature of the mold portion 9 in the stator coil 3 is about 15.7°C. At 1 [°C], the rise in the outer surface temperature of the base portion 8s stops at about 4.9 [°C], respectively, confirming that a sufficient heat dissipation effect can be obtained.

Further, FIG. 11 shows a modified example in which a cooling function is added. 1 to 10 is configured as an inner rotor type in which the movable body portion Mm is arranged inside the fixed body portion Mc, the rotary drive device 1 according to the present invention is a modified example shown in FIG. It is also possible to configure it as an outer rotor type. In FIG. 11, an air cooling function using the movement (rotation) of the movable body Mm is provided as a cooling function. , are provided. Specifically, a plurality of blower fins 55 are integrally formed on the outer surfaces of the side portions 14p and 14q of the rotor holding portion 13 at predetermined intervals in the circumferential direction. As a result, when the movable body portion Mm rotates, air can be blown radially outward, and an air-cooling function that further enhances the heat radiation effect can be added. Although the case of the outer rotor type has been described with reference to FIG. 11, the inner rotor type shown in FIGS. 1 to 10 can also be provided in the same way.

Therefore, according to the rotary drive device 1 according to this embodiment, as a basic configuration, the rotor yoke 5 formed in a ring shape and the rotor magnet 4 having a plurality of magnetic poles arranged along the circumferential direction Ff of the rotor yoke 5 are provided. a stator 2 formed in a ring shape, a fixed body portion Mc in which a plurality of stator core portions 2c . At least a part of the stator coils 3 wound on the coils 2c is covered with an insulating coating material 7 having thermal conductivity, and the insulating coating material 7 is brought into contact with at least a part of the stator core portions 2c to provide insulation. Since the coating material 7 is provided with the heat dissipation mold portion 9 in contact with or close to the inner surface 8i of the housing portion 8 facing the outside, the movable body portion Mm includes the rotor yoke 5 formed in a ring shape and a plurality of magnetic poles. Since it has the ring-shaped rotor magnet 4 arranged along the circumferential direction Ff of the outer peripheral portion of 5, it is possible to eliminate a conventional large-sized rolling bearing for turning the movable body portion Mm. As a result, it is possible to significantly reduce the weight of the movable body portion Mm, and it is possible to reduce the moment of inertia while supporting high torque. Cost efficiency and energy saving can be further improved.

In addition, a fixed body portion Mc in which a plurality of stator core portions 2c . A plurality of support rollers 6 which are fixed in position with respect to the stator 2 and rotatably support the movable body portion Mm by bringing the roller peripheral surfaces 6f into contact with the outer peripheral portion or the inner peripheral portion of the movable body portion Mm. . . , the overall structure can be simplified, and in particular, the thickness of the entire device can be reduced. As a result, it is possible to provide the rotary drive device 1 with excellent versatility and expandability, such as being able to sufficiently meet installation requirements in narrow spaces where the interval is about 10 [mm] or less. can.

Moreover, at least a portion of the stator coils 3 wound around the stator core portions 2c are covered with an insulating coating material 7 having thermal conductivity, and the insulating coating material 7 is brought into contact with at least a portion of the stator core portions 2c. In addition, since the heat radiation mold portion 9 is provided in which the insulating coating material 7 is in contact with or close to the inner surface 8i of the housing portion 8 facing the outside, the heat radiation in the rotary drive device 1 can be effectively and efficiently performed. It is possible to reduce the heat generated by the stator coils 3 and furthermore the heat generated by the rotary drive device 1 as a whole. As a result, it is possible to prevent a decrease in output torque and fluctuations in characteristics due to heat generation. Moreover, it is possible to avoid a decrease in the service life of the rotation drive device 1 and troubles in maintenance due to a rise in temperature, and it is possible to contribute to the realization of further miniaturization (thickness).

Although the preferred embodiments have been described in detail above, the present invention is not limited to such embodiments, and detailed configurations, shapes, materials, quantities, numerical values, etc. do not deviate from the gist of the present invention. Any change, addition, or deletion can be made within the range.

For example, the number (number of poles) of the stator core portions 2c and the number of poles of the rotor magnet 4 are not limited to the illustrated number (number of poles), and generally can be implemented based on any number. . Further, it is desirable to use radial bearings as the support rollers 6, but it is not intended to exclude the roller function using rollers or the like which have a simple structure. On the other hand, although it is desirable to bring the insulating coating material 7 into contact with the inner surface 8i of the housing portion 8, it is not excluded that they are brought close to each other with a slight gap therebetween. At this time, it is desirable to bring the base part 8s and the cover part 8c into contact with or close to each other, but it is not excluded that either one of them is brought into contact with or close to the base part 8s. The base portion 8s and/or the cover portion 8c are made of a material having a thermal conductivity higher than that of the insulating coating material 7, and the insulating coating material 7 includes the coating materials 2cc of the stator core portions 2c and the stator It is desirable to form the coils 3 from a material having a higher thermal conductivity than the coating material of the coils 3, but it is not always an essential component, and for example, it excludes the case where the same thermal conductivity is set. isn't it.

The rotary drive device according to the present invention has a hollow inside, and is used by adding various specific functional units to the hollow, such as an automatic loom, an RGB color filter (optical device), and a blower. , opening control devices, shutter devices (optical control devices), hand devices for robots, in-wheel motors, and the like.

1: rotary drive device, 2: stator, 2c...: stator core portion, 2cc...: coating material, 2s: one end face of stator, 2t: other end face of stator, 3...: stator coil, 4: rotor magnet, 5: rotor yoke , 6: support roller, 6f: roller peripheral surface, 7: insulation coating material, 8: housing portion, 8i: inner surface of housing portion, 8s: base portion, 8c: cover portion, 9: heat radiation mold portion, 51 ventilation space, 52: air blowing means, 53: water pipe, 55: air blowing fin, Mc: fixed body portion, Mm: movable body portion, Mmo: outer surface of movable body portion, Ms: movable body support portion, Ff: circumference direction, Sc: accommodation space, Sa: hollow part

Claims (12)

A stator integrated with a plurality of stator cores and a stator coil wound around the stator core, a rotor magnet having a plurality of magnetic poles facing the stator core, and a rotor yoke attached to the rotor magnet. a rotor yoke formed in a ring shape; and a rotor magnet having a plurality of magnetic poles arranged along the circumferential direction of the rotor yoke; The stator has a fixed body portion in which a plurality of stator core portions facing the movable body portion are arranged at predetermined intervals along the circumferential direction, and at least a part of a stator coil wound around the stator core portion. The stator core is covered with an insulating coating material having thermal conductivity, and the insulating coating material is brought into contact with at least a part of the stator core portion, and the insulating coating material is brought into contact with or close to the inner surface of the housing portion facing the outside. A rotary drive device, comprising: a heat-dissipating molded portion. The stator has a movable body support portion composed of a plurality of support rollers which are fixed in position with respect to the stator and rotatably support the movable body portion by bringing the peripheral surfaces of the rollers into contact with the movable body portion. 2. A rotary drive device according to claim 1, comprising: 3. The rotary drive device according to claim 2, wherein the support roller is arranged in a housing space formed by removing a part of the plurality of stator core portions. 2. The rotation drive device according to claim 1, wherein the housing portion includes a base portion for fixing one end surface of the stator and a cover portion for covering the other end surface of the stator. 5. The rotary drive device according to claim 4, wherein the base portion and/or the cover portion are made of a material having a higher thermal conductivity than that of the insulating coating material. 2. The rotary drive device according to claim 1, wherein the insulating coating material uses a material having a higher thermal conductivity than the coating material of the stator core portion and the coating material of the stator coil. 2. The rotary drive device according to claim 1, wherein the insulating coating material covers each coil unit or a plurality of coil units in the stator coil. 2. The rotation drive device according to claim 1, wherein the housing portion is formed in a shape that covers at least part of the stator with a ventilation space interposed therebetween. 9. The rotary drive device according to claim 8, wherein said housing portion is provided with a blower means for blowing air into said ventilation space. 9. The rotation driving device according to claim 8, wherein the housing portion is provided with a water pipe for heat exchange disposed along the ventilation space and a water passage means for passing water through the water pipe. 2. The rotary drive device according to claim 1, wherein the movable body has a plurality of blowing fins attached to the outer surface thereof for blowing air as the movable body moves. 2. The rotation drive device according to claim 1, wherein the movable body portion is configured by providing a hollow portion inside the inner peripheral portion.

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