JP2008061396A - Dynamo-electric machine and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method for dynamo-electric machine, which efficiently removes the vanish adhering to the peripheral surface of a stator core at vanish treatment. <P>SOLUTION: The vanish 126 adhering to the peripheral surface of the stator core 121 is mechanically removed by rotating a cutting tool 11 in the state of having pushed it against the peripheral surface of the stator core 121. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rotating electrical machine and a method for manufacturing the same, and typically relates to a technique for mechanically removing deposits attached to the peripheral surface of an iron core.

  As a background art relating to a manufacturing method of a rotating electrical machine, for example, one disclosed in Patent Document 1 is known. In Patent Document 1, when the coil end of a motor coil is immersed in protective paint, the protective paint is melted by the heat of the heated coil end, and the non-painted portion of the motor coil is attached to the coil end. A technique has been disclosed in which the coil end is dipped in a protective paint after cooling, thereby eliminating the need for a masking process on non-painted portions.

JP 2003-260407 A

  When manufacturing a stator for a rotating electrical machine, assemble the assembly by attaching the side of the winding to the groove formed in the core so that the end of the winding protrudes from both ends of the core in the axial direction. Thereafter, varnish is applied to the end of the winding and the groove of the iron core. This varnish treatment is performed in order to achieve electrical insulation protection of the windings or to prevent displacement of the windings due to vibration or the like. As described above, when the varnish is applied to the assembly, the varnish adheres to the peripheral surface of the iron core in the process. The varnish adhering to the peripheral surface of the iron core may cause displacement or inclination of the stator with respect to the casing in the process of assembling the stator to the casing. For this reason, in manufacturing a stator of a rotating electrical machine, after varnishing, a process of cutting the varnish adhering to the peripheral surface of the iron core, or a process of masking so that the varnish does not adhere to the peripheral surface of the iron core during the varnish treatment Has been done.

  However, after the varnish treatment, the treatment for cutting the varnish adhering to the peripheral surface of the iron core has been performed manually, since no mechanical treatment technology has been established so far. For the masking treatment, for example, a masking drape is wound around the peripheral surface of the iron core before the varnish treatment, and the masking tape is peeled off after the varnish treatment. As described above, in any of the processes, the work becomes complicated and a lot of processing time is consumed. Therefore, at present, establishment of a production method capable of improving workability has become an issue.

  In this regard, the method of applying protective paint as in the background art makes it difficult to attach a sufficient amount of protective paint that penetrates into the groove of the iron core to the coil end, and the protective paint can penetrate into the groove of the iron core. It is difficult to obtain a stator structure in which varnish is filled in the groove of the iron core. Further, the background art does not consider the adhesion of the protective paint to the peripheral surface of the iron core, and has not yet solved the above-described problem.

  The present invention provides a method of manufacturing a rotating electrical machine that can efficiently remove varnish adhering to the peripheral surface of an iron core during varnish treatment.

  Here, the present invention assembles the assembly by attaching the sides of the windings to the grooves formed in the core so that the ends of the windings protrude outward from both axial ends of the core. After the varnish is applied to the end portion and the groove of the iron core, the cutting tool is rotated with the cutting tool pressed against the peripheral surface of the iron core to remove the varnish adhering to the peripheral surface of the iron core.

  According to the present invention, the cutting tool is rotated with the cutting tool pressed against the peripheral surface of the iron core to remove the varnish adhering to the peripheral surface of the iron core. Can be removed. Therefore, according to this invention, the removal process of the varnish adhering to the surrounding surface of an iron core can be implemented efficiently.

  In addition, the present invention provides a rotating electrical machine that can securely fix a winding mounted on an iron core and that can improve the accuracy of assembling the iron core to the casing.

  Here, the present invention includes an iron core that is fitted into a casing and has a plurality of grooves for mounting windings, a winding side portion, and winding end portions provided at both ends thereof. The winding side portion has windings mounted in a plurality of grooves of the iron core so that the end portion protrudes from both ends in the axial direction of the iron core, and the winding end portion and the groove of the iron core for mounting the winding wire The cutting process for removing the varnish applied inside is performed on the peripheral surface of the iron core.

  According to the present invention, since the varnish is provided in the groove of the core for mounting the winding, the winding can be fixed in the groove of the core for mounting the winding. Moreover, according to the present invention, since the varnish is cut on the peripheral surface of the iron core, when the iron core is fitted into the housing, the varnish adhering to the peripheral surface of the iron core is used to It is possible to prevent the position shift or tilt of the iron core that occurs in the machine. Therefore, according to the present invention, the winding attached to the iron core can be securely fixed, and the assembly accuracy of the iron core to the housing can be improved.

  According to the present invention described above, the varnish adhering process on the peripheral surface of the iron core can be efficiently performed, thereby improving the workability in the production line of the rotating electrical machine (reducing the man-hours and time of the varnish removing process) And can contribute to the improvement of the productivity of the rotating electrical machine and the reduction of the manufacturing cost of the rotating electrical machine.

  In addition, according to the present invention, the winding attached to the iron core can be securely fixed, and the assembly accuracy of the iron core with respect to the housing can be improved. Mechanical contact between components can be prevented, and a high-performance and highly reliable rotating electrical machine can be provided.

  An embodiment of the present invention will be described with reference to FIGS.

  In the embodiments described below, the present invention constitutes a drive source for a hybrid vehicle together with an engine that is an internal combustion engine, and a permanent magnet AC synchronous motor that generates rotational power for driving front wheels or rear wheels of the hybrid vehicle. A case where the present invention is applied to the stator will be described as an example. The permanent magnet AC synchronous motor uses an in-vehicle battery as a power source, and the drive is controlled by an inverter device that converts DC power supplied from the in-vehicle battery into AC power. The permanent magnet AC synchronous motor receives a driving force from the front wheels or the rear wheels and operates as a generator during regeneration of the hybrid vehicle to generate AC power. AC power output from a permanent magnet AC synchronous motor operated as a generator is converted into DC power by an inverter device, and supplied to an in-vehicle battery for charging.

  The present invention may be applied to other rotating electrical machines that require varnish treatment. For example, a stator of a permanent magnet AC synchronous motor used for driving an auxiliary machine of an automobile, a stator of a wound field AC synchronous rotating electric machine used for driving or generating an automobile, driving or generating power of a railway vehicle or an automobile, or You may apply to the stator of the induction motor used for the drive of the installation and apparatus installed in the factory.

  First, the configuration of a permanent magnet AC synchronous motor (hereinafter simply referred to as “motor”) 100 of this embodiment will be described with reference to FIGS.

  The electric motor 100 is configured to generate rotational power by rotating the rotor 130 by the mutual magnetic action of the stator 120 and the rotor 130, and to output the rotational power to the outside via the rotating shaft 133. Has been. The stator 120 and the rotor 130 are held inside the casing 110.

  The casing 110 has a high thermal conductivity and is made of a light metal such as aluminum, and has a cylindrical outer frame 111 having a circular inner peripheral side, and both axial ends of the outer frame 111. It is comprised from the end plates 112 and 113 which block | close the opening part. The end plates 112 and 113 are annular disk-shaped housing members. A bearing 101 is provided on the inner peripheral side of the end plate 112, and a bearing 102 is provided on the inner peripheral side of the end plate 113. The bearings 101 and 102 hold the rotating shaft 133 rotatably.

  The stator 120 includes a stator core 121 whose outer peripheral side is fixed to the inner peripheral side of the outer frame 111, and a stator winding 122 that is attached to the stator core 121 and receives supply of three-phase AC power from the inverter device. Has been.

  The stator core 121 is a cylindrical magnetic body, and is formed, for example, by laminating a plurality of silicon steel plates having the same annular disk shape in the axial direction. A plurality of core teeth 127 are provided on the inner peripheral portion of the stator core 121 so as to protrude radially inward from the outer peripheral portion (core core joint portion 128) of the stator core 121. Each of the iron core tooth portions 127 is formed continuously in the axial direction and is arranged at equal intervals in the circumferential direction to form 48 fixed magnetic poles. A winding groove 123 (slot) is formed between the iron core teeth 127 adjacent in the circumferential direction. Each of the winding grooves 123 is formed so as to penetrate the stator core 121 in the axial direction and open on the inner peripheral surface of the stator core 121, and is arranged at equal intervals in the circumferential direction.

  The stator winding 122 is configured by electrically connecting the phase windings of the u phase, the v phase, and the w phase by a star connection method or a delta connection method. Each of the phase windings is configured by electrically connecting a plurality of unit phase windings in series, parallel, or series-parallel. Each of the unit phase windings is configured by winding a winding conductor 125 a plurality of times.

  In the present embodiment, a case where a round wire (enameled wire) having a circular cross-sectional shape is used as the winding conductor 125 will be described as an example. As the winding conductor 125, a rectangular wire having a rectangular cross section or a pentagonal shape may be used.

  After winding the winding conductor 125, the unit phase winding is formed in, for example, a turtle shell shape, and is mounted between two winding grooves 123 that are spaced across several winding grooves 123. Here, the unit phase winding is composed of two winding sides and two winding ends. The winding side portions are two straight portions that are mounted in the winding groove 123 via the insulating paper 124. The winding end portions are provided at both ends of the two winding side portions, connect the two winding side portions, and project between the two ends protruding in the axial direction from the axial end portions of the stator core 121. Part.

  In this embodiment, as the configuration of the stator winding 12, a case is used in which distributed windings in which unit phase windings are mounted in two winding grooves 123 spaced across several winding grooves 123 are used. An example will be described. As a configuration of the stator winding 12, a concentrated winding in which unit phase windings are mounted in two winding grooves 123 adjacent to each other with the tooth core 127 interposed therebetween may be used. Further, in this embodiment, a case where one layer winding in which a winding side portion of one unit phase winding is mounted on one winding groove 123 will be described as an example. A two-layer winding in which winding side portions of two unit phase windings are attached to 123 may be used.

  After each unit phase winding is mounted in the winding groove 123 and connected, a varnish 126 is applied to the inside of the winding groove 123 and the winding end of each unit phase winding. The varnish 126 has a role of an insulating material for ensuring electrical insulation and a role of an adhesive for fixing (adhering) the winding side portion of the unit phase winding to the winding groove 123. It is an insulation hardening resin, for example, unsaturated polyester resin impregnated in the groove 123 and the winding end of each unit phase winding.

  The rotor 130 includes a rotor core 131 fixed to the outer periphery of the rotating shaft 133 and a permanent magnet 132 that is embedded in the outer periphery of the rotor core 131 and forms eight rotating magnetic poles.

  The rotor core 131 is a cylindrical magnetic body, and is formed, for example, by laminating a plurality of silicon steel plates having the same annular disk shape in the axial direction. The outer periphery of the rotor core 131 is provided with eight permanent magnet insertion holes formed so as to penetrate the rotor core 131 in the axial direction and arranged at equal intervals in the circumferential direction. Permanent magnets 132 are inserted into the permanent magnet insertion holes so that adjacent ones in the circumferential direction have opposite polarities (the polarities on the stator 120 side are alternately N and S). The permanent magnet 132 is a neodymium sintered magnet magnetized in the radial direction.

  In this embodiment, a case where a neodymium sintered magnet is used as the permanent magnet 132 will be described as an example. As the permanent magnet 132, a neodymium resin magnet, a ferrite sintered magnet, or a resin magnet may be used.

  An auxiliary magnetic pole portion 135 is formed in the rotor core portion between the permanent magnet insertion holes adjacent in the circumferential direction. The auxiliary magnetic pole part 135 constitutes a magnetic circuit that bypasses the magnetic circuit of the permanent magnet 132, and is an area in which a magnetic flux is directly generated on the rotor 130 side by the magnetomotive force of the stator 120. Magnetic pole piece portions 136 are formed on the rotor core portion on the outer peripheral side (stator 120 side) of each permanent magnet insertion hole. The magnetic pole piece 136 is an area constituting a magnetic circuit through which the magnetic flux of the permanent magnet 132 passes. The electric motor 100 of the present embodiment configured as described above can utilize the torque due to the magnetic flux of the permanent magnet 132 and the reluctance torque due to the magnetic flux passing through the auxiliary magnetic pole part 135.

  A pair of non-magnetic portions 134 formed of magnetic gaps (slit portions) are formed at both ends in the circumferential direction of the permanent magnet 132. The non-magnetic portion 134 is provided to moderate the gradient of the magnetic flux density distribution of the permanent magnet 132 between the circumferential end portions of the permanent magnet 132 and the auxiliary magnetic pole portion 135 and suppress torque pulsation due to cogging torque or the like. It is formed integrally with the permanent magnet insertion hole, and is formed adjacent to the circumferential end of the permanent magnet 132 when the permanent magnet 132 is inserted into the permanent magnet insertion hole. Similarly to the permanent magnet insertion hole, the nonmagnetic portion 134 is also formed so as to penetrate in the axial direction. The nonmagnetic part 134 may be filled with a filler such as varnish. Between the magnetic pole piece portion 136 and the auxiliary magnetic pole portion 135, a magnetic path portion having a width smaller than the radial width of the permanent magnet 132 is formed by forming the nonmagnetic portion 134. The magnetic path part is also called a bridge part, and forms a magnetic saturation part for reducing the leakage magnetic flux of the permanent magnet 132.

  A magnetic pole position detector (resolver) 103 for detecting the magnetic pole position of the rotor 130 and an encoder for detecting the position of the rotor 130 are disposed on the rotary shaft 133 at one end in the axial direction of the rotor 130. 104 is provided. Detection signals output from them are input to a controller of an inverter device that controls driving of the electric motor 100. The inverter device performs a calculation based on the input detection signal, a command signal output from a host control device, and the like, and controls the voltage to be applied to the stator winding 122 of the electric motor 100. Thereby, the drive of the electric motor 100 is controlled.

  Next, the manufacturing method of the electric motor 100, in particular, the varnish removing process step of the stator 120 will be described with reference to FIGS.

  As described above, after the stator winding 122 is mounted on the stator core 121, the assembly of the stator core 121 and the stator winding 122 is subjected to varnish treatment, that is, the inside of the winding groove 123 and The winding end of each unit phase winding is impregnated with varnish 126 and cured. At this time, the varnish 126 adheres not only to the inside of the winding groove 123 and the winding end of each unit phase winding, but also to the outer peripheral surface of the stator core 121. In particular, the varnish 126 adhering to the outer peripheral surface of the stator core 121 becomes a factor that causes a displacement or inclination of the stator 120 with respect to the casing 110 when the stator 120 is assembled to the casing 110. For this reason, in the present embodiment, the manufacturing process of the electric motor 100 includes a process for removing the varnish 126 adhering to the outer peripheral surface of the stator core 121. Moreover, in this embodiment, the varnish 126 is removed mechanically.

  First, the configuration of the varnish removing device for removing the varnish 126 attached on the outer peripheral surface of the stator core 121 will be described.

  The varnish removing device 1 is composed of various mechanisms including a cutting mechanism 10, a support mechanism 30, and a sensor mechanism 40. Each mechanism including the cutting mechanism 10, the support mechanism 30, and the sensor mechanism 40 is installed inside the housing 2. A control panel and instruments (not shown) are installed on the side surface outside the housing 2.

  The cutting mechanism 10 includes a cutting tool 11. The cutting tool 11 is moved relative to the assembly of the stator core 121 and the stator winding 122, and the cutting tool 11 is rotationally driven to rotate the outer surface of the stator core 121. The varnish 126 adhering to the substrate is cut and removed. The cutting tool 11 is a rotary blade in which a screw-shaped cutting blade is formed on the outer peripheral surface of a cylindrical member and rotates around the central axis of the cylindrical member extending in the vertical direction. A rotary shaft is connected to a drive shaft 15 extending downward from the main body, and rotates in response to a rotational driving force from the drive motor 14. Collars 12 and 13 having substantially the same outer diameter as the cutting tool 11 are arranged side by side on the same axis on the upper and lower ends of the cutting tool 11. The collars 12 and 13 are short cylindrical rotating bodies and are provided with respect to the rotating shaft of the cutting tool 11.

  In the present embodiment, the case where the collars 12 and 13 which are short cylindrical rotating bodies are arranged on the same axis on both the upper and lower ends of the cutting tool 11 has been described as an example, but instead of the collars 12 and 13. A bearing may be provided.

  The drive motor 14 is attached to a slide guide 17 that can move along the guide rail 16. The guide rail 16 is provided horizontally with respect to the installation surface of the housing 2, that is, the ground. For this reason, the slide guide 17 can move in the horizontal direction (arrows A and B directions). Thereby, the drive motor 14 can move in the horizontal direction in the housing 2 together with the slide guide 17. Accordingly, the cutting tool 11 and the collars 12 and 13 that are rotationally driven by the drive motor 14 can also move in the horizontal direction.

  One end of the wire 21 is connected to the right end of the slide guide 17. The wire 21 extends in the horizontal direction (arrow B direction), is hung on a pulley 22 rotatably attached to the housing 2, and hangs vertically on the installation surface of the housing 2, that is, on the ground. A balance weight 23 is fixed to the other end of the wire 21. The balance weight 23 is a movable source for moving the slide guide 17 by its own weight, and can be moved in the vertical direction (arrow K, L direction) by its own weight and the pull of the wire 21. For this reason, when the balance weight 23 is lowered in the arrow L direction by its own weight, the slide guide 17 moves in the arrow B direction. Conversely, when the slide guide 17 moves in the direction of arrow A, the balance weight 23 is pulled by the wire 21 and pulled up in the direction of arrow K.

  A movable mechanism is provided at a portion facing the right end of the slide guide 17. The movable mechanism is a movable source for moving the slide guide 17, and is composed of parts including a cylinder 20, a rod 19 and a push piece 18. The cylinder 20 is fixed horizontally inside the housing 2. The rod 19 is provided integrally with a piston that slides inside the cylinder 20, protrudes from the inside of the cylinder 20 to the outside (slide guide 17 side), and in the horizontal direction (directions of arrows C and D) as the piston slides. It is movable. The push piece 18 is provided at the tip of the rod 19 opposite to the cylinder 20 side.

  The piston inside the cylinder 20 slides in the direction of arrow C by air pressure, hydraulic pressure or mechanical force, the rod 19 moves in the direction of arrow C, the push piece 18 contacts the right end of the slide guide 17, and the slide guide 17 When pushed in the direction of arrow A, the slide guide 17 moves in the direction of arrow A. When the air pressure or hydraulic pressure is released, the slide guide 17 moves in the direction of arrow B and the rod 19 is pushed, or when the piston inside the cylinder 20 slides in the direction of arrow D by mechanical force, the rod 19 moves in the direction of arrow D. Move.

  The support mechanism 30 is configured to rotate the assembly 140 while supporting the assembly 140 of the stator core 121 and the stator winding 122. A bearing holder 33 holding a bearing 34 is fixed on the upper surface of the base 2 a inside the housing 2. The bearing 34 rotatably holds a stator core holder 31 provided so as to protrude upward from the upper surface of the bearing holder 33. A drive motor 36 that rotationally drives the stator core holder 31 is fixed under the base 2 a inside the housing 2. A rotating shaft 35 that extends upward from the main body of the drive motor 36 through the base 2 a is connected to the lower end of the stator core holder 31.

  An engaging portion with the assembly 140 is formed at the upper end portion of the stator core holder 31. The engaging portion is constituted by a plurality of fins 32 formed on the outer peripheral surface of the upper end portion of the stator core holder 31. The fins 32 are protrusions that extend continuously along the axis of the stator core holder 31 and are arranged at equal intervals in the circumferential direction. When the assembly 140 is mounted on the stator core holder 31, the stator 32 It engages with the opening (recessed portion) of the winding groove 123 of the iron core 121. As a result, when rotational power is transmitted from the drive motor 36 to the stator core holder 31 and the stator core holder 31 rotates, the assembly 140 rotates in the direction of arrow H without sliding with respect to the stator core holder 31. it can. The upper end of the stator core holder 31 is tapered. Thereby, the assembly 140 can be easily attached to the stator core holder 31.

  The sensor mechanism 40 is a contact-type position detection sensor and is configured to detect the outer peripheral position of the stator core 121. The contact-type position detection sensor has a symmetrical positional relationship with respect to the cutting tool 11 and is provided at a position where the cutting tool 11 is rotated 180 ° with the support mechanism 30 as an axis. The contact-type position detection sensor main body 41 is attached and fixed horizontally with respect to the installation surface of the housing 2, that is, the ground. A measuring rod 42 extends from the contact-type position detection sensor main body 41 toward the support mechanism 30 side. The measuring rod 42 can move in the horizontal direction (arrow E, F direction) with respect to the contact-type position detection sensor main body 41. Thereby, at the time of varnish cutting by the cutting tool 11, the measurement rod 42 extends to the outer peripheral surface of the stator core 121 and contacts the outer peripheral surface of the stator core 121.

  Next, the varnish removal processing method by the varnish removal apparatus 1 is demonstrated.

  First, in the pre-process of the varnish removing process, the stator winding 122 is mounted on the stator core 121 to manufacture the assembly 140, the assembly 140 is varnished, and the inside of the winding groove 123 and each unit. The winding ends of the phase winding are impregnated with varnish 126 and cured. At this time, the varnish 126 adheres not only to the inside of the winding groove 123 and the winding end of each unit phase winding, but also to the outer peripheral surface of the stator core 121.

  Next, the assembly 140 manufactured in the previous process is manually fitted into the stator core holder 31 from the axial direction, and the positions of the fins 32 and the winding grooves 123 of the stator core 121 are aligned, The winding groove 123 is engaged. Thereby, the assembly 140 is mounted on the support mechanism 30.

  After that state, the varnish removing device 1 is automatically activated. When the varnish removing device 1 is automatically activated, first, the rod 19 that presses the right end of the slide guide 17 via the push piece 18 and moves the slide guide 17 away from the support mechanism 30 is movable in the direction of arrow D. (Reduction), and the pressure of the rod 19 hanging on the right end of the slide guide 17 is released. When the pressure is released, the balance weight 23 descends in the direction of the arrow L due to its own weight, and the slide guide 17 receives the movable force via the wire 21. As a result, the slide guide 17 is pulled in the direction of arrow B and moves along the guide rail 16 in the direction of arrow B. With this movement, the cutting tool 11, the collars 12, 13 and the drive motor 14 also move in the same direction, and the cutting tool 11 is applied to the varnish 126 attached on the outer peripheral surface of the stator core 121 or the outer peripheral front surface of the stator core 121. Touch. Simultaneously with these operations, the measuring rod 42 of the sensor mechanism 40 moves in the direction of arrow E. As a result, the tip of the measuring rod 42 contacts the outer peripheral surface of the stator core 121.

  Next, the drive motor 14 is driven to rotate, and the cutting tool 11 and the collars 12 and 13 are rotated in the arrow G direction. Simultaneously with this operation, the drive motor 36 is driven to rotate based on the outer peripheral position information of the stator core 121 obtained via the measuring rod 42, and the stator core holder 31 is rotated to rotate the assembly 140 in the direction of arrow H. Let Thereby, the varnish 126 adhering to the outer peripheral surface of the stator core 121 can be cut and removed over the entire outer periphery of the stator core 121 while pressing the rotating cutting tool 11 on the outer peripheral surface of the stator core 121. At this time, in order not to cut the outer peripheral surface of the stator core 121 by the cutting tool 11, the pressing force of the cutting tool 11 against the stator core 121 is set in advance so that only the varnish 126 can be removed by cutting. It is adjusted by the weight of the balance weight 23 and the like. Further, when the cutting tool 11 is cut, either one of the collars 12 and 13 having the same outer diameter as the cutting tool 11 is pressed onto the outer peripheral surface of the stator core 121, and the cutting tool 11 is outer peripheral surface of the stator core 121. Therefore, it is possible to prevent the outer peripheral surface of the stator core 121 from being cut by the cutting tool 11.

  When the outer peripheral position information of the stator core 121 detected by the measuring rod 42 of the sensor mechanism 40 reaches a predetermined value, the rotational drive of the drive motors 14 and 36 stops. Here, the predetermined value is the outer peripheral length (measured value) of the stator core 121 measured in advance using the sensor mechanism 40 or the outer peripheral length (input) of the stator core 121 input as a parameter to the activation program of the varnish removing device 1. Value).

  When the rotational drive of the drive motors 14 and 36 stops, the rod 19 moves (extends) from the cylinder 20 in the direction of arrow C, the push piece 18 contacts the right end of the slide guide 17, and presses the right end of the slide guide 17. To do. As a result, the slide guide 17 moves in the direction of arrow A along the guide rail 16. With this movement, the cutting tool 11, the collars 12, 13 and the drive motor 14 also move in the same direction, and the cutting tool 11 and the collars 12, 13 are separated from the outer peripheral surface of the stator core 121. At this time, the balance weight 23 is pulled by the slide guide 17 through the wire 21 and pulled up in the arrow K direction. Simultaneously with these operations, the measuring rod 42 of the sensor mechanism 40 moves in the direction of arrow F. As a result, the measuring rod 42 is separated from the outer peripheral surface of the stator core 121.

  The varnish 126 adhering to the outer peripheral surface of the stator core 121 can be continuously removed by repeating the above operation.

  Thus, the varnish removal process is completed, and the stator 120 is completed. The completed stator 120 is removed from the stator core holder 31 and incorporated into the inner peripheral side of the outer frame 111 in the next manufacturing process.

  According to the present embodiment described above, the varnish 126 attached to the outer peripheral surface of the stator core 121 is removed by rotating the cutting tool 11 while being pressed against the outer peripheral surface of the stator core 121, so that the stator core is removed. The varnish 126 adhering to the outer peripheral surface of 121 can be mechanically removed. Thereby, according to the present Example, the removal process of the varnish 126 adhering on the outer peripheral surface of the stator core 121 can be implemented efficiently. Therefore, according to the present embodiment, the workability in the production line of the electric motor 100 can be improved (the work man-hour and time for the varnish removal process can be shortened), and the productivity of the electric motor 100 can be improved and the production cost of the electric motor 100 can be reduced. Can contribute.

  Further, according to the present embodiment, since the varnish 126 is provided in the winding groove 123 of the stator core 121, the stator winding 122 can be fixed to the winding groove 123, and the outer periphery of the stator core 121 can be fixed. Since the varnish 126 is cut on the surface, when the stator core 121 is fitted to the outer frame 111, the varnish 126 between the outer core 111 and the outer frame 111 is attached to the outer surface of the stator core 121. Can be prevented from being displaced or tilted. Thus, in this embodiment, the stator winding 122 can be reliably fixed to the stator core 121, and the assembly accuracy of the stator core 121 with respect to the outer frame 111 can be improved. Therefore, according to the present embodiment, it is possible to suppress a significant decrease in the performance of the electric motor 100, to prevent mechanical contact between components due to rotation, and to provide a high-performance and highly reliable electric motor 100. .

The top view which shows the structure of the varnish removal apparatus which is an Example of this invention. It is an enlarged plan view of the principal part of FIG. 1, and shows the state which a cutting tool contacts the varnish on the outer peripheral surface of a stator core, and the varnish is removed by rotation of a cutting tool. FIG. 2 is an enlarged plan view of the main part of FIG. 1, showing a state in which the outer peripheral position of a rotating stator core is measured with the tip of the measuring rod contacting the outer peripheral surface of the stator core. It is an enlarged plan view of the principal part of FIG. 1, and shows the state which a cutting tool contacts the varnish on the outer peripheral surface of the rotating stator core, and the varnish is removed by rotation of the cutting tool. Sectional drawing which shows the structure of the electric motor which is an Example of this invention. VI-VI arrow sectional drawing of FIG. The expanded sectional view of the VII part of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Varnish removal apparatus, 11 ... Cutting tool, 100 ... Electric motor, 120 ... Stator, 121 ... Stator iron core, 122 ... Stator winding, 123 ... Winding groove, 126 ... Varnish

Claims (8)

Sides of the windings are mounted in grooves formed in the iron core so that ends of the windings protrude from both ends in the axial direction of the iron core, and varnishes are formed in the ends of the windings and in the grooves. A method of manufacturing a rotating electrical machine having a stator provided with
An assembly is assembled by mounting the windings on the iron core, and the varnish is applied to the assembled assembly, and then the cutting tool is rotated with the cutting tool pressed against the peripheral surface of the iron core. The manufacturing method of the rotary electric machine characterized by including the process of removing the said varnish adhering to the surrounding surface. In the manufacturing method of the rotary electric machine according to claim 1,
A method of manufacturing a rotating electrical machine, comprising: rotating the cutting tool while changing a position of the cutting tool with respect to a circumferential direction of the assembly. In the manufacturing method of the rotary electric machine according to claim 2,
The method of manufacturing a rotating electrical machine, wherein the position of the cutting tool relative to the circumferential direction of the assembly is changed by rotating the assembly. In the manufacturing method of the rotary electric machine according to claim 2,
The position of the cutting tool relative to the circumferential direction of the assembly is changed by moving the cutting tool along the circumferential surface of the assembly. In the manufacturing method of the rotary electric machine according to any one of claims 1 to 4,
A rotating electrical machine having the same outer shape as the cutting tool and pressing either one of rotating bodies attached to both axial ends of the cutting tool together with the cutting tool on a peripheral surface of the iron core Production method. In the manufacturing method of the rotary electric machine according to any one of claims 1 to 5,
Using a cylindrical tool as the cutting tool, the cutting tool is arranged with respect to the assembly so that the central axis of the cutting tool and the central axis of the assembly are parallel to each other, and the circumference of the iron core is A method of manufacturing a rotating electrical machine, wherein an outer peripheral surface of the cutting tool is pressed against a surface. An iron core that is fitted into a housing and has a plurality of grooves for mounting windings;
The winding side portion includes a winding side portion and winding end portions provided at both end portions, and the winding side portion protrudes outward from both end portions in the axial direction of the iron core. And windings mounted on the
Varnish is applied to the winding end and the plurality of grooves,
A rotating electric machine characterized in that a cutting process for removing the varnish is performed on a peripheral surface of the iron core. The rotating electrical machine according to claim 7,
A rotating electrical machine wherein the peripheral surface of the iron core is subjected to cutting by rotation of a cutting tool.

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