JP2009268190A - Rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotating electric machine in which a bearing current is reduced without deteriorating the efficiency of the rotating electric machine by adding a simple and inexpensive component, thereby preventing wear of a bearing, damage of a rotating shaft, breakage, and the like. <P>SOLUTION: A specific length portion of a longitudinal direction of a non-magnetic conductor plate 2a which has been machined in strip is conducted to a plurality of laminate plates (not shown) 130b-130c constituting a stator 12 in a slot 125a on both end portions of a lateral direction of the non-magnetic conductor plate 2a, insulating sleeves 1a wrapped by an insulator 3a in which the whole surface of the non-magnetic conductor plate 120a except the conducted portion are disposed and fixed so as to close an opening portion 126a of the slot 125a to which the coil is inserted, and the coil 102 and the rotor 104 are electrostatically shielded. Thus, the rotating electric machine capable of preventing electrolytic corrosion without deteriorating energy conversion efficiency can be obtained. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rotating electrical machine equipped with an electrolytic corrosion prevention device that occurs in a rotating electrical machine using a bearing device driven by an inverter.

  In recent years, it has become common to drive a rotating electrical machine such as an induction machine with a power converter such as an inverter as a method of controlling the rotational speed. A voltage-type PWM inverter is best known as an inverter driving method.

  Now, with the recent development of high-speed power semiconductor elements, the carrier frequency of voltage-type PWM inverters has increased, and due to the steep voltage change that occurs during inverter switching, high-frequency induction is induced on the rotating shaft of the rotating electrical machine. The shaft voltage generated based on the above tends to increase. As the shaft voltage increases, the potential difference between the inner ring portion and the outer ring portion of the bearing device indicating the rotating shaft increases, and the bearing current generated in the bearing device increases. This bearing current causes corrosion called electrolytic corrosion on the raceway surface and the surface of the rolling ring of the inner ring portion and outer ring portion, thereby deteriorating the durability of the bearing device. Therefore, it is necessary to take measures to prevent the occurrence of electrolytic corrosion. It was.

  Conventionally, a rotating electrical machine having a function of preventing this type of bearing current has an insulating sleeve in which the surface of a nonmagnetic conductor is covered with an insulator disposed in a slot opening, and only one point of the nonmagnetic conductor is a laminated plate. The coil and rotor are shielded electrostatically without degrading the energy conversion efficiency by preventing the current loop linked to the teeth made of ferromagnetic material from being formed by the nonmagnetic conductor plate and teeth. The thing which prevented food is known (for example, patent documents 1).

  The rotating electrical machine will be described below with reference to FIGS.

  FIG. 5 is a diagram showing a schematic configuration of a conventional rotating electrical machine. In the drawing, a conventional rotating electrical machine 100 is, for example, an induction motor, and a stator 101 has a coil 102 disposed inside and is fixed to an inner peripheral surface of a housing 103. The rotor 104 is a rotor of an induction motor having, for example, a squirrel-cage coil, and includes a rotating shaft 105 and bearing devices 106a and 106b. The rotor 104 is fixed to two end brackets 108a and 108b fixed to both ends of the housing 103 with bolts 107 via bearing devices 106a and 106b attached to the rotary shaft 105. R-phase, S-phase, and T-phase output terminals 110 to 112 of inverter 109 are respectively connected to R-phase, S-phase, and T-phase taps 113 to 115 of coil 102 of rotating electrical machine 100. The frame ground terminal 116 of the rotating electrical machine 100 is connected to the frame ground terminal 117 of the inverter 109 via the ground wire 118, and the frame ground terminal 117 is grounded.

  FIG. 6 is a configuration diagram of an insulating sleeve of a conventional rotating electric machine. In the drawing, the insulating sleeves 119a to 119c are formed of strips such as copper on the surfaces of nonmagnetic conductor plates 120a to 120c with insulators 121a to 121c. Wrapped. The insulators 121a to 121c are made of polyimide so that the electrostatic coupling capacity between the nonmagnetic conductor plates 120a to 120c of the insulating sleeves 119a to 119c and the conductors arranged close to the insulating sleeves 119a to 119c is reduced. An insulating material having a small relative dielectric constant is used. Protruding portions 123a to 123c made of a nonmagnetic conductor exposed from the surfaces of the insulators 121a to 121c are attached to one side 122a to 122c in the short direction of the nonmagnetic conductor plates 120a to 120c, and insulating sleeves 119a to 119c. The conductor which contacts is connected to the nonmagnetic conductors 120a to 120c through the protrusions 123a to 123c.

  FIG. 7 shows a configuration of a conventional rotating electrical machine, in which 100 to 105 are the same as 100 to 105 in FIG. 5, and 119a to 119c, 120a to 120c, 121a to 121c, 122a to 122c, respectively. , 123a to 123c are the same as 119a to 119c, 120a to 120c, 121a to 121c, 122a to 122c, and 123a to 123c in FIG. The conventional rotating electrical machine 100 is, for example, an induction motor, and an electrostatic coupling capacitor 124 exists between the coil 102 and the stator 101. The insulating sleeves 119a to 119c are arranged and fixed so as to close the openings 126a to 126c of the slots 125a to 125c. The nonmagnetic conductor plates 120a to 120c are grounded to the teeth 127 on one side 122a to 122c in the short direction of the insulating sleeves 119a to 119c via the protrusions 123a to 123c described above, and the coil 102 and the rotor 104 are electrostatically connected. Shielded. Since the coil 102 and the rotor 104 are electrostatically shielded by the nonmagnetic conductor plates 120a to 120c, the electrostatic coupling capacitance 128 between the coil 102 and the rotor 104 is remarkably reduced. Since a closed circuit for transmitting the common mode voltage applied to the ground as the axial voltage generated in the air gap capacitance 129 is not formed, the axial voltage generated in the air gap capacitance 129 is significantly reduced, and the air gap capacitance is reduced. The bearing current generated as the discharge current of the shaft voltage charged in 129 is also reduced or eliminated, and the electrolytic corrosion of the bearing portion can be prevented.

FIG. 8 is a view showing the structure around the stator as seen from the direction A shown in FIG. In the drawing, the insulating sleeves 119a to 119c of the conventional rotating electric machine 100 are arranged and fixed so as to close the openings 126a to 126c of the slots 125a to 125c. The entire surface of the non-magnetic conductor plate 120a of the insulating sleeve 119a is covered with an insulator 121a, and the non-magnetic conductor plate 120a is connected to one side 122a of the non-magnetic conductor 120a on one side 122a through one protrusion 123a. It is connected to two adjacent laminated plates 130a to 130b. Similarly, the entire surface of the non-magnetic conductor plate 120b of the insulating sleeve 119b is covered with an insulator 121b, and the non-magnetic conductor plate 120b has one protrusion 123b attached to one side 122b in the short direction of the non-magnetic conductor 120b. The two laminated plates 130d to 130e are adjacent to each other so as not to be electrically connected to the nonmagnetic conductor plates 130b and 130c. Similarly, the entire surface of the nonmagnetic conductor plate 120c of the insulating sleeve 119c is covered with an insulator 121c, and the nonmagnetic conductor plate 120c has one protrusion 123c attached to the short side 122c of the nonmagnetic conductor 120c. The two laminated plates 130f to 130g are connected so as not to be electrically connected to the nonmagnetic conductor plates 130d and 130e. As described above, in the conventional rotating electrical machine 100, the adjacent laminated plates conducting to the nonmagnetic conductor plates are arranged so as not to coincide with the adjacent laminated plates conducting to the other nonmagnetic conductor plates. The current path passing through the conductor plate and the laminated plate does not form a current loop interlinking with a part of the tooth 127 made of a ferromagnetic material. Since there is no current loop interlinking with a part of the tooth 127 made of a ferromagnetic material such as a silicon steel plate, a rotating magnetic field that changes in the direction B from the front surface to the back surface of the paper illustrated in FIG. The eddy currents induced in the laminated plates 130a to 130k are remarkably reduced or no longer generated, and the energy conversion efficiency of the rotating electrical machine can be prevented from deteriorating due to eddy current loss.
Japanese Unexamined Patent Application Publication No. 2004-297876 (page 4, FIG. 4, FIG. 5, FIG. 6)

  In the process of storing the coil in the slot, a method of automatically inserting the insulating sleeve into the slot together with the already wound coil using an insert machine is generally used. In this rotating electrical machine, a protrusion is attached only to one side in the short direction of the nonmagnetic conductor plate of the insulating sleeve, and only one point of the nonmagnetic conductor is connected to the laminated plate in the slot via this attachment portion. Therefore, when using an insert machine that automatically inserts the insulation sleeve into the slot together with the already wound coil, the insulation sleeve is inserted into the slot in the short direction of the insulation sleeve during insertion. It was difficult to move and to make the protrusions make reliable contact with the laminated plate in the slot to provide electrostatic shielding between the coil and the rotor.

  The present invention solves such a conventional problem, and even when a method of automatically inserting an insulating sleeve into a slot together with a coil using an insert machine is employed, the insulating sleeve is brought into contact with more certainty. An object of the present invention is to provide a rotating electrical machine capable of performing electrostatic shielding.

  In order to achieve the above object, a rotating electrical machine of the present invention is formed of a plurality of laminated plates that are insulated from each other and have a slot and teeth, and a coil is disposed in the slot. An inverter having a housing fixed to a surface, a rotor having a rotating shaft, and a bearing device, the rotating shaft being held via the bearing device, and two end brackets fixed to both ends of the housing In a rotating electric machine to be driven, a specific length in the longitudinal direction of a nonmagnetic conductor plate processed into a strip shape is defined as the length in the short direction, and the length in the transverse direction of the nonmagnetic conductor plate or a length less than that. The extension plate is attached to the non-magnetic conductor plate, and the exposed portion of the extension plate is formed on the surface of the extension plate. Non-magnetic except The surface of the body plate is wrapped with an insulator, and within the slot, only a specific length portion in the longitudinal direction of the nonmagnetic conductor plate is short of the nonmagnetic conductor plate via the exposed portion of the extension plate. Insulating sleeves that can be connected to a plurality of the laminated plates arranged on both sides in the direction are arranged and fixed so as to block the opening of the slot between the coil and the slot, and the nonmagnetic conductor Arbitrary laminated plates among a plurality of adjacent laminated plates conducted to a plate are the same as any laminated plate among other adjacent laminated plates conducted to other nonmagnetic conductor plates In order to prevent the laminated plate from being formed, a position in the longitudinal direction of a specific length portion of the extension plate conducted to the laminated plate is arranged, and the nonmagnetic conductor plate and the laminated plate are made of a ferromagnetic material. A current loop interlinking with the teeth is formed. Without degrading the energy conversion efficiency in the odd, is obtained by a rotating electric machine, characterized in that the between the said coil rotor to be able to prevent electrostatic shielding to galvanic corrosion.

  By this means, an inexpensive and simple addition of components prevents the generation of large eddy currents, and the insertion machine automatically inserts the insulating sleeve into the slot using the insert machine without degrading the energy conversion efficiency. Even when this is adopted, it is possible to provide a rotating electrical machine that can reduce or eliminate the bearing current and eliminate electric corrosion.

  2. The rotating electrical machine according to claim 1, wherein the insulating sleeve is covered with an insulator so that the surface thereof is flat.

  By this means, an inexpensive and simple addition of components prevents the generation of large eddy currents, and the insertion machine automatically inserts the insulating sleeve into the slot using the insert machine without degrading the energy conversion efficiency. Even when this is adopted, it is possible to provide a rotating electrical machine that can reduce or eliminate the bearing current and eliminate electric corrosion.

  In order to achieve the above object, the rotating electrical machine of the present invention has a plurality of adjacent laminated plates that are electrically connected to the nonmagnetic conductor plate, and another adjacent plurality that are electrically connected to the other nonmagnetic conductor plate. The laminated plate that is not connected to at least one nonmagnetic conductor plate is disposed between the laminated plate and the teeth made of a ferromagnetic material by the nonmagnetic conductor plate and the teeth. 3. The rotating electrical machine according to claim 1, wherein an electric corrosion can be prevented by electrostatically shielding between the coil and the rotor without degrading the energy conversion efficiency without forming a current loop. Is.

  By this means, an inexpensive and simple addition of components prevents the generation of large eddy currents, and the insertion machine automatically inserts the insulating sleeve into the slot using the insert machine without degrading the energy conversion efficiency. Even when this is adopted, it is possible to provide a rotating electrical machine that can reduce or eliminate the bearing current and eliminate electric corrosion.

  In addition, by using a low dielectric constant material having a relative dielectric constant of 5 or less for the insulator, the electrostatic coupling capacity between the coil and the stator is reduced, so that the gap between the inverter and the frame ground terminal of the rotating electrical machine is 4. The rotating electrical machine according to claim 1, wherein the leakage current flowing through the connecting ground wire can be prevented from increasing.

  By this means, an inexpensive and simple addition of components prevents the generation of large eddy currents, and the insertion machine automatically inserts the insulating sleeve into the slot using the insert machine without degrading the energy conversion efficiency. Even when this is adopted, it is possible to provide a rotating electrical machine that can reduce or eliminate the bearing current and eliminate electric corrosion.

  According to the present invention, since the insulating sleeve of the present invention contacts the laminated plate in the slot through the both ends of the nonmagnetic conductor in the short direction, together with the coil already wound using the insert machine Even when the method of automatically inserting the insulation sleeve into the slot is adopted, the insulation sleeve moves in the short direction of the insulation sleeve in the slot during automatic insertion, and one side of the extension plate of the nonmagnetic conductor plate is in the slot. In the worst case, the contact area in contact with the laminated plate may be in a state where one of the extension plates of the nonmagnetic conductor plate cannot contact the laminated plate in the slot. The other contact portion in the short direction with respect to the nonmagnetic conductor plate can secure a sufficient contact area with the laminated plate in the slot. On the contact part of In addition, the nonmagnetic conductor plate can be reliably connected to the laminated plate in the slot via the extension plate, and an insulating electrostatic shielding material in which the entire surface of the nonmagnetic conductor plate is wrapped with an insulator is provided with the coil. And the slot opening between the slot and the slot is fixed, and the coil and the rotor are electrostatically shielded. It is possible to provide a rotating electric machine that reduces or eliminates the occurrence of electric corrosion.

  In addition, an arbitrary laminated plate in a plurality of adjacent laminated plates conducted to a nonmagnetic conductive plate is an arbitrary laminated plate in a plurality of other adjacent laminated plates conducted to another nonmagnetic conductive plate. In order not to have the same laminated plate as the above, the longitudinal position of the specific length portion of the extension plate conducted to the laminated plate is arranged, and the non-magnetic conductor plate and the laminated plate are used to form teeth made of a ferromagnetic material. Since no interlinkage current loop is formed, the bearing current is reliably reduced or eliminated by adding inexpensive and simple parts without deteriorating energy conversion efficiency without increasing the eddy current generated in the stator. It is possible to provide a rotating electric machine that can eliminate electric corrosion.

  The invention according to claim 1 of the present invention is arranged on both sides of the nonmagnetic conductor plate through the exposed portions of the extension plate attached to a specific length portion in the longitudinal direction of the nonmagnetic conductor plate processed into a strip shape. An insulating sleeve that is electrically connected to a plurality of laminated plates and encloses the surface of the non-magnetic conductor plate excluding the exposed portion of the extension plate with an insulator so as to close the opening of the slot between the coil and the slot. Since the coil and the rotor are electrostatically shielded by the non-magnetic conductor plate, the capacitance between the coil and the rotor disappears or becomes extremely small, and the common mode voltage supplied from the inverter is reduced. The shaft voltage generated as the response voltage is reduced or eliminated, the bearing current is not generated, and the electric corrosion of the bearing portion is eliminated.

  Further, the non-magnetic conductor plate of the insulating sleeve is electrically connected to the non-magnetic conductor plate by being connected to a plurality of laminated plates disposed on both sides of the non-magnetic conductor plate in the slot through the exposed portion of the extension plate. Arbitrary laminated plates in a plurality of adjacent laminated plates do not become the same laminated plate as any laminated plate in a plurality of other adjacent laminated plates conducted to other nonmagnetic conductor plates. Insulating sleeves are arranged so that the current loops interlinked with the teeth made of ferromagnetic material are not formed by the nonmagnetic conductor plate and the laminated plate, and are induced by the rotating magnetic field generated in the teeth. Since a large eddy current is not generated in the magnetic conductor plate and the laminated plate, the energy conversion efficiency does not deteriorate due to a loss caused by the eddy current.

  Further, the nonmagnetic conductor plate of the insulating sleeve has a specific length portion in the longitudinal direction of the nonmagnetic conductor plate disposed on both sides in the short direction of the nonmagnetic conductor plate through the exposed portion of the extension plate in the slot. When the method of automatically inserting the insulation sleeve into the slot together with the coil already wound using the insert machine is adopted, the insulation sleeve is automatically inserted during the automatic insertion. Moves in the short direction of the insulating sleeve in the slot, and the contact area where one side of the extension plate of the nonmagnetic conductor plate contacts the laminated plate in the slot is reduced or, in the worst case, the extension plate of the nonmagnetic conductor plate Even if one side in the short direction cannot contact the laminated plate in the slot, the other contact portion in the short direction with respect to the nonmagnetic conductor plate has a sufficient contact area with the laminated plate in the slot. If you can secure By this action, at the other contact portion in the short direction with respect to the non-magnetic conductor plate, the non-magnetic conductor plate can be reliably conducted to the laminated plate via the extension plate, and the non-magnetic conductor plate is connected to the coil. The rotor can be reliably electrostatically shielded to reliably reduce or eliminate electric corrosion.

  The insulation sleeve is coated with an insulator so that its surface is flat. Even when the insulation sleeve is automatically installed in the slot together with the coil already wound using the insert machine, the insulation sleeve is insulated. Since the surface of the sleeve is a flat surface, it can be automatically mounted in the same manner as a general slot key.

  Further, at least one or more of the nonmagnetic conductors between a plurality of adjacent laminated plates conducted to the nonmagnetic conductor plate and other neighboring laminated plates conducted to the other nonmagnetic conductor plate. A laminated plate that is not connected to the plate is arranged so that the nonmagnetic conductor plate does not conduct to other nonmagnetic conductor plates, and the current loop interlinking with the teeth made of a ferromagnetic material is formed by the nonmagnetic conductor plate and the It is not formed by teeth, and has an effect that a large eddy current is not generated in the nonmagnetic conductor plate and the laminated plate by being induced by a rotating magnetic field generated in the teeth.

  In addition, since the insulator uses a low dielectric constant material having a relative dielectric constant of 5 or less, the insulator is placed between the coil and the electrostatic shielding plate disposed close to the electrostatic shielding plate. Consideration is made to reduce the electrostatic coupling capacity, that is, the electrostatic coupling capacity between the coil and the stator, and the leakage current flowing through the ground wire connecting the inverter and the frame ground terminal of the rotating electrical machine does not increase. Have

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
The rotating electrical machine 6 (not shown) of the present embodiment is an induction motor as an example, and the basic configuration is the same as that of the conventional rotating electrical machine 100 shown in FIG. That is, it has bearing devices 106a and 106b, and the rotor 104 is fixed to two end brackets 108a and 108b fixed by bolts 107 to both ends of the housing 103 via bearing devices 106a and 106b attached to the rotary shaft 105. Has been. R-phase, S-phase, and T-phase output terminals 110 to 112 of inverter 109 are respectively connected to R-phase, S-phase, and T-phase taps 113 to 115 of coil 102 of rotating electrical machine 100. The frame ground terminal 116 of the rotating electrical machine 100 is connected to the frame ground terminal 117 of the inverter 109 via the ground wire 118, and the frame ground terminal 117 is grounded.

  However, in the present embodiment, the configuration of the insulating sleeve shown in FIG. 1 is different from that of the stator 12 into which the insulating sleeve shown in FIG. 2 is inserted. The configuration will be described below.

  FIG. 1 shows the configuration of an insulating sleeve of a rotating electrical machine according to Embodiment 1 of the present invention. In the figure, insulating sleeves 1a to 1c are nonmagnetic conductor plates 2a to 2c obtained by processing a nonmagnetic conductor such as copper into a strip shape. Is wrapped with insulators 3a to 3c. The insulators 3a to 3c are made of polyimide so as to reduce the electrostatic coupling capacity between the nonmagnetic conductor plates 2a to 2c of the insulating sleeves 1a to 1c and the conductors arranged close to the insulating sleeves 1a to 1c. An insulating material having a small relative dielectric constant is used. The specific length L of the nonmagnetic conductor plates 2a to 2c in the longitudinal direction is defined as the short direction length, and the nonmagnetic conductor plates 2a to 2c are defined as the length W in the short direction. The extension plates 4a to 4c are attached to the nonmagnetic conductor plates 2a to 2c one by one by welding or the like. Insulating the surfaces of the nonmagnetic conductor plates 2a to 2c so that the exposed portions 5a to 5c of the extension plates 4a to 4c are formed on the surfaces of the nonmagnetic conductor plates 2a to 2c and the surfaces thereof are flat. The non-magnetic conductor except for the exposed portions 5a to 5c of the extension plates 4a to 4c, which is covered with the body 3a to 3c and does not generate a step on the surface of the portion to which the extension plates 4a to 4c are attached and the portion to which the extension plates 4a to 4c are attached. The surfaces of the plates 2a to 2c are to be covered with the insulators 3a to 3c. The conductors that are in contact with the insulating sleeves 1a to 1c, that is, the slots 125a to 125c, which will be described later, have a structure that conducts to the nonmagnetic conductor plates 2a to 2c through the exposed portions 5a to 5c of the extension plates 4a to 4c. Yes.

  FIG. 2 shows the configuration of the stator of the rotating electrical machine according to the first embodiment of the present invention. In the drawing, the stator 12 has a coil 102 arranged inside and is fixed to the inner peripheral surface of the housing 103. The rotor 104 is a rotor of an induction motor provided with, for example, a cage coil.

  The slots 125a to 125c into which the coil 102 is inserted from the openings 126a to 126c are arranged in the stator 12 with the teeth 127 interposed therebetween.

  The insulating sleeves 1a to 1c are obtained by covering the surfaces of the nonmagnetic conductor plates 2a to 2c with the insulators 3a to 3c except for the exposed portions 5a to 5c of the extension plates 4a to 4c, and the nonmagnetic conductor plates 2a to 2c. Are arranged so as to be electrically connected to the teeth 127 in the slots 125a to 125c through the exposed portions 5a to 5c of the extension plates 4a to 4c. Since the insulating sleeves 1a to 1c are arranged and fixed so as to close the openings 126a to 126c of the slots 125a to 125c, the coil 102 and the rotor 104 are electrostatically shielded by the nonmagnetic conductor plates 2a to 2c. The A common circuit voltage applied between each phase of the coil 102 and the ground when the inverter 109 is driven to drive the rotating electrical machine forms a closed circuit that is transmitted as an axial voltage generated in the air gap capacitance 129. Therefore, the coil 102 and the rotor 104 are electrostatically shielded by the non-magnetic conductor plates 2a to 2c, so that the electrostatic coupling capacity 128 between the coil 102 and the rotor 104 is remarkably reduced, and the air gap capacity 129 is reduced. The generated shaft voltage is remarkably reduced, and the bearing current generated as the discharge current of the shaft voltage charged in the air gap capacity 129 is also reduced or eliminated, and the electrolytic corrosion of the bearing portion can be prevented.

  As described with reference to FIG. 1, the insulating 1a-1c sleeve covers the surfaces of the nonmagnetic conductors 2a-2c with the insulators 3a-3c so that the surfaces thereof are flat. As a method that is generally used when inserting into ~ 125c, even if a method of automatically inserting the already wound coil 102 together with the insulating sleeves 1a to 1c by an insert machine is adopted, As in the case of automatically inserting the slot key, it can be automatically inserted together with the coil wound using the insert machine.

  FIG. 3 is a structural view around the stator as viewed from the direction A shown in FIG. The stator 12 is configured by stacking laminated plates 130a to 130k.

  In the figure, the insulating sleeves 1a to 1c are arranged and fixed so as to close the openings 126a to 126c of the slots 125a to 125c. The nonmagnetic conductor plate 2a is electrically connected to the adjacent laminated plates 130b to 130c in the slot 125a through the exposed portion 5a of the extension plate 4a. Similarly, the nonmagnetic conductor plate 2b is electrically connected to the adjacent laminated plates 130d to 130e in the slot 125b through the exposed portion 5b of the extension plate 4b. Similarly, the nonmagnetic conductor plate 2c is electrically connected to the adjacent laminated plates 130f to 130g in the slot 125c through the exposed portion 5c of the extension plate 4c.

  As shown in the figure, any laminate plate among the laminate plates 130b to 130c that contacts the extension plate 4a, any laminate plate among the laminate plates 130d to 130e that contact the extension plate 4b, and the extension plate 4c are contacted. By shifting the position where the extension plates 4a to 4c are attached to the nonmagnetic conductor plates 2a to 2c little by little so that any of the laminated plates 130f to 130g to be formed does not become the same laminate plate, the nonmagnetic conductor The attachment positions of the extension plates 4a to 4c to the plates 2a to 2c are determined. Since the insulating sleeve is thus attached, the current path passing through the nonmagnetic conductor plate 2a and the laminated plates 130b to 130c does not form a current loop interlinking with a part of the tooth 127 made of a ferromagnetic material. Similarly, a current path passing through the nonmagnetic conductor plate 2b and the laminated plates 130d to 130e or a current path passing through the nonmagnetic conductor plate 2c and the laminated plates 130f to 130g is a part of the tooth 127 made of a ferromagnetic material. Does not form a current loop that interlinks with. Since there is no current loop interlinking with a part of the tooth 127 made of a ferromagnetic material such as a silicon steel plate, there is a rotating magnetic field that changes in the direction B from the front surface to the back surface of the paper shown in FIG. The eddy currents induced in the laminated plates 130a to 130k are significantly reduced or are not generated, and the energy conversion efficiency of the rotating electrical machine can be prevented from deteriorating due to eddy current loss.

(Embodiment 2)
The rotating electrical machine according to the second embodiment of the present invention is different only in the arrangement method of the insulating sleeve in which the nonmagnetic conductor of the rotating electrical machine according to the first embodiment is brought into contact with a plurality of laminated plates via the extension plate. The description of the same parts as those of the rotating electric machine according to the first embodiment of the present invention described with reference to FIG.

  FIG. 4 is a structural diagram around the stator as seen from the direction A shown in FIG. 2 in the rotating electric machine according to the second embodiment of the present invention. In the figure, 1a to 1c, 2a to 2c, 3a to 3c, 4a to 4c, 5a to 5c, 12, 125a to 125c, 126a to 126c, 127, and 130a to 130k are the same as those in the first embodiment. The description is omitted.

  The nonmagnetic conductor plate 2a is electrically connected to the adjacent laminated plates 130b to 130c in the slot 125a through the exposed portion 5a of the extension plate 4a. The nonmagnetic conductor plate 2b is separated from the laminated plate 130d that is not conductive to any other nonmagnetic conductor plate, and is adjacent to the laminated plates 130e to 130f in the slot 125b via the exposed portion 5b of the extension plate 4b. Is conducting. The nonmagnetic conductor plate 2c is separated from the laminated plate 130g not conducting to any other nonmagnetic conductive plate, and the adjacent laminated plates 130h to 130i in the slot 125c through the exposed portion 5c of the extension plate 4c. Is conducting. As shown in the drawing, any laminate plate among the laminate plates 130b to 130c that contacts the extension plate 4a, any laminate plate among the laminate plates 130e to 130f that contact the extension plate 4b, and the extension plate 4c are contacted. Extension plate while sandwiching a laminate plate that is not connected to any non-magnetic conductor plate through the extension plate so that any of the laminate plates 130h to 130i to be formed does not become the same laminate plate The attachment positions of the extension plates 4a to 4c to the nonmagnetic conductor plates 2a to 2c are determined while gradually shifting the positions of attaching the 4a to 4c to the nonmagnetic conductor plates 2a to 2c.

  Since the insulating sleeve is thus attached, the current path passing through the nonmagnetic conductor plate 2a and the laminated plates 130b to 130c does not form a current loop interlinking with a part of the tooth 127 made of a ferromagnetic material. Similarly, a current path passing through the nonmagnetic conductor plate 2b and the laminated plates 130e to 130f or a current path passing through the nonmagnetic conductor plate 2c and the laminated plates 130h to 130i is a part of the tooth 127 made of a ferromagnetic material. Does not form a current loop that interlinks with. Since there is no current loop interlinking with a part of the tooth 127 made of a ferromagnetic material such as a silicon steel plate, there is a rotating magnetic field that changes in the direction B from the front surface to the back surface of the paper shown in FIG. The eddy currents induced in the laminated plates 130a to 130k are significantly reduced or are not generated, and the energy conversion efficiency of the rotating electrical machine can be prevented from deteriorating due to eddy current loss.

  In the second embodiment, a single sheet is provided between a plurality of adjacent laminated plates conducted to the nonmagnetic conductor plate and another neighboring laminated plate conducted to the other nonmagnetic conductor plate. Laminate plates that are not connected to the non-magnetic conductor plate are disposed, but a plurality of adjacent laminate plates that are electrically connected to the non-magnetic conductor plate and other adjacent laminate plates that are electrically connected to the other non-magnetic conductor plate A laminated plate that is not connected to two or more non-magnetic conductor plates may be disposed between the two, and there is no difference in the effect.

  Since the insulators 3a to 3c are made of a low relative dielectric constant material having a relative dielectric constant of 5 or less, such as polyimide, the insulators 3a to 3c approach the nonmagnetic conductor plates 2a to 2c with the insulators 3a to 3c interposed therebetween. The electrostatic coupling capacitance between the coil 102 and the non-magnetic conductor plates 2a to 2c, that is, the electrostatic coupling capacitance 124 between the coil 102 and the stator 12 is considered to be small. As a response current to the common mode voltage applied to the coil 102, the leakage current generated in the ground wire connecting the inverter and the rotating electrical machine can be prevented from increasing, and unnecessary electromagnetic waves radiated from the ground wire are not increased. Can be.

  In the first to second embodiments, nonmagnetic conductors made of copper are used for the nonmagnetic conductor plates 2a to 2c. However, instead of copper, aluminum, platinum, gold, conductive polymer, etc. A non-magnetic conductor may be used, and no difference is produced in its effect.

  Insulators 3a to 3c use polyimide, but instead of polyimide, the dielectric constant is 5 or less, such as polypropylene, polystyrene, polycarbonate, polyethylene terephthalate, polytetrafluoroethylene, etc. An insulating material may be used, and there is no difference in the operation effect.

  Although the rotary electric machine 6 is an induction motor, a rotary electric machine such as a DC motor, a synchronous machine, a stepping motor, or a reluctance motor may be used instead of the induction motor, and there is no difference in the operational effect.

  By using the insulating sleeve of the present invention for a canned type induction motor, the coil and the insulating sleeve can be automatically mounted in the slot as easily as the conventional insulating sleeve, without deteriorating the power conversion efficiency of the motor. It is possible to eliminate the electric corrosion of the bearing device caused by the bearing current generated in the induction motor driven by the inverter. By attaching the insulating sleeve of the present invention, the inverter driven DC motor or the synchronous motor It can also be applied to electric corrosion countermeasures such as motors.

Configuration diagram of the insulating sleeve of the rotating electrical machine according to the first embodiment of the present invention. Configuration diagram of the rotating electrical machine Structural diagram around the stator of the same rotating electrical machine Structural diagram around the stator of the rotating electrical machine according to the second embodiment of the present invention Schematic configuration diagram of a conventional rotating electrical machine Configuration diagram of the insulation sleeve of the same rotating electrical machine Configuration diagram of the rotating electrical machine FIG. 7 is a configuration diagram of a conventional rotating electrical machine viewed from the direction A illustrated in FIG.

Explanation of symbols

1a Insulating sleeve 1b Insulating sleeve 1c Insulating sleeve 2a Nonmagnetic conductor plate 2b Nonmagnetic conductor plate 2c Nonmagnetic conductor plate 3a Insulator 3b Insulator 3c Insulator 4a Extension plate 4b Extension plate 4c Extension plate 5a Exposed part 5b Exposed part 5c Exposed Part 6 Rotating electrical machine 12 Stator 100 Rotating electrical machine 102 Coil 103 Housing 104 Rotor 105 Rotating shaft 106a Bearing device 106b Bearing device 108a End bracket 108b End bracket 109 Inverter 125a Slot 125b Slot 125c Slot 126a Opening 126b Opening 126a Opening 126a Opening 130a Opening 130a Laminated plate 130b Laminated plate 130c Laminated plate 130d Laminated plate 130e Laminated plate 130f Laminated plate 130g Laminated plate 130h Laminated plate 130i Laminated plate 130j Laminated plate 130k laminated board

Claims (4)

A stator formed of a plurality of laminated plates that are insulated from each other and having slots and teeth, a coil that is disposed in the slot, a housing that fixes the stator to the inner peripheral surface, and a rotor that has a rotating shaft; Non-magnetic machined into a strip shape in an inverter-driven rotating electrical machine having a bearing device and holding the rotating shaft via the bearing device and having two end brackets fixed to both ends of the housing The length of the conductor plate is defined as the length in the short direction, and the length of the nonmagnetic conductor plate in the width direction or a length less than that is provided as one extension plate. The extension plate is attached to the nonmagnetic conductor plate, and the surface of the nonmagnetic conductor plate excluding the exposed portion of the extension plate is wrapped with an insulator so that an exposed portion is formed on the surface of the extension plate. , The slot Inside, a plurality of the laminated plates in which only a specific length portion in the longitudinal direction of the nonmagnetic conductor plate is disposed on both sides in the short direction of the nonmagnetic conductor plate through the exposed portion of the extension plate Insulating sleeves that can be electrically connected to each other are arranged and fixed between the coil and the slot so as to close the opening of the slot, and are connected to the non-magnetic conductor plate. Conductive to the laminated plate so that the arbitrary laminated plate is not the same laminated plate as any of the other adjacent laminated plates that are conducted to the other non-magnetic conductor plate. A position in the longitudinal direction of the specific length portion of the extended plate is arranged so that a current loop linked to the teeth made of a ferromagnetic material is not formed by the nonmagnetic conductor plate and the laminated plate. To reduce energy conversion efficiency And no rotary electric machine, characterized in that the between the said coil rotor to be able to prevent electrostatic shielding to galvanic corrosion. 2. The rotating electrical machine according to claim 1, wherein the insulating sleeve is covered with an insulator so that a surface thereof is flat. Between at least one of the non-magnetic conductor plates adjacent to each other and the other non-magnetic conductor plates between at least one of the non-magnetic conductor plates and at least one of the non-magnetic conductor plates. The laminated plate not connected to the magnetic conductor plate is arranged so that a current loop interlinking with the teeth made of a ferromagnetic material is not formed by the non-magnetic conductor plate and the teeth, thereby degrading energy conversion efficiency. The rotating electrical machine according to claim 1, wherein the electric corrosion can be prevented by electrostatically shielding between the coil and the rotor. The insulator is made of a low dielectric constant material having a relative dielectric constant of 5 or less, thereby reducing the electrostatic coupling capacity between the coil and the stator and connecting the inverter and the frame ground terminal of the rotating electrical machine. The rotating electrical machine according to any one of claims 1 to 3, wherein leakage current flowing in the wire can be prevented from increasing.

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