JP2013198367A - Capacitor and inverter integrated type three-phase synchronous motor device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low-cost capacitor and inverter integrated type three-phase synchronous motor device that is made compact and lightweight by employing an integrated structure and suppresses noise generation.SOLUTION: A three-phase motor 3A, an inverter device 4A, and a capacitor 5A are arranged on a center axis and integrated with the inverter device 4A interposed. The three-phase motor 3A includes a rotor 31A born on a housing 2 and a stator 35A fixed to the housing 2. The inverter device 4A is constituted annularly by connecting legs between an upper arm and a lower arm of three phases to armature windings 38A of the stator 35A respectively. The capacitor 5A includes a capacitance portion 54 housed in an annular space, a positive electrode connection portion 52 connected to a positive electrode terminal of the inverter device 4A and a positive electrode plate 541 of the capacitance portion 54, and a negative electrode connection portion 53 connected to a negative electrode terminal of the inverter device 4A and a negative electrode plate 542 of the capacitance portion 54.

Description

  The present invention relates to a three-phase synchronous motor and a motor device in which a capacitor and an inverter for driving the three-phase synchronous motor are integrated.

  In recent years, hybrid vehicles equipped with an engine and a motor as a driving source for traveling are rapidly spreading, and various types of driving devices have been put into practical use. In many cases, a three-phase synchronous motor is used as the motor. The driving wheel is driven by power supplied from an on-vehicle battery power source during power running, and regenerative power generation is performed during braking to charge the battery power source. For this reason, it is common to provide a drive control unit in which a capacitor and an inverter device are connected in parallel between a motor and a battery power source to perform bidirectional power conversion. Since a hybrid vehicle has a plurality of driving sources for traveling, the number of components tends to increase, and the mounting space is more restrictive than an engine vehicle. For this reason, there is a strong demand for miniaturization and weight reduction of motors, capacitors, and inverter devices, and for the combined integration of these devices.

  The present applicant has disclosed an inverter device and an inverter-integrated motor suitable for this type of vehicle-mounted application in Patent Document 1. In the inverter device of Patent Document 1, a plurality of equilateral triangular power semiconductor chips are connected to constitute a power semiconductor module, and six power semiconductor modules are arranged in a regular hexagonal shape. Thereby, a module can be arrange | positioned space-efficiently and an inverter apparatus can be reduced in size. Furthermore, the inverter-integrated motor of Patent Document 1 is integrated by aligning the center of the inverter device with the rotating shaft of the motor. That is, since the inverter device has a ring shape (annular shape), the shape is matched with that of a motor having a substantially circular cross section, which is suitable for integration and can be miniaturized.

JP 2009-88466 A

  By the way, although patent document 1 disclosed the integration technique of the inverter and the motor, it does not mention the integration technique of the three parties including the capacitor. In addition, a specific structure for integration is not disclosed, and various problems associated with the integration, countermeasures thereof, and a structure suitable for reduction in size and weight have not been clarified. For example, by optimizing the electrical connection method and the arrangement of connection conductors, measures to suppress radiated induction noise and radio wave noise, the cooling structure of the inverter device and motor, the arrangement of rotation sensors, etc. It is preferable to realize cost reduction.

  The present invention has been made in view of the above-mentioned problems of the background art, and by adopting an integrated structure, it is possible to reduce the size and weight, and to suppress the generation of noise and a low-cost capacitor and inverter integrated three-phase synchronization. Providing a motor device is a problem to be solved.

  The invention of a three-phase synchronous motor device integrated with a capacitor and an inverter according to claim 1 for solving the above-described problems is a rotor that is rotatably supported around a central axis in a housing, and a three-phase armature winding of the rotor. A three-phase synchronous motor having a stator disposed around and fixed to the housing, and a three-phase upper arm and a lower arm each including a power semiconductor module for controlling a conduction phase and connected to a DC power source, Legs between the upper and lower arms of the three-phase are connected to the armature windings of the stator, respectively, and an inverter device configured in an annular shape around the central axis is formed coaxially with the central axis A capacitance portion accommodated in the annular space, connected to the positive terminal of the DC power source, and extending along one of the inner circumferential surface and the outer circumferential surface of the annular space, Connected to the positive electrode terminal of the barter device and the positive electrode plate of the capacitance unit, and connected to the negative electrode terminal of the DC power supply and extends along the other of the inner peripheral surface and the outer peripheral surface of the annular space A capacitor including a negative electrode terminal of the inverter device and a negative electrode connection portion connected to the negative electrode plate of the electrostatic capacitance portion is disposed and integrated on the central axis with the inverter device interposed therebetween. .

  According to a second aspect of the present invention, in the first aspect, an annular cooling device is further provided on the central axis between the inverter device and the stator, and the inverter device is disposed on a cooling surface of the cooling device. ing.

  According to a third aspect of the present invention, in the first or second aspect, the outer peripheral wall of the housing is extended to a rear portion of the rotor that is supported on the inverter device side and extends rearward in the central axis direction. An inverter device and the capacitor were incorporated.

  The invention according to claim 4 is the invention according to claim 3, wherein a pair of bus bars arranged coaxially inside and outside is fixed to a wiring hole drilled on the central axis of the lid member that closes the rear end of the extended portion. One end of one bus bar is connected to the positive electrode of the DC power supply, the other end is connected to the positive electrode connection portion of the capacitor, one end of the other bus bar is connected to the negative electrode of the DC power supply, and the other end is connected to the negative electrode of the capacitor Connected to the connection.

  The invention according to claim 5 is the rotation according to claim 3 or 4, wherein the rotation is provided on a front wall of the capacitor facing the three-phase synchronous motor and protrudes into an inner circumferential space of the inverter device to detect the rotation of the rotor. A sensor is further provided.

  The invention according to claim 6 is the invention according to any one of claims 1 to 5, wherein one of the positive electrode connecting portion and the negative electrode connecting portion extends to the outer peripheral side from the inner peripheral cylindrical portion and the inner peripheral cylindrical portion. The other of the positive electrode connecting portion and the negative electrode connecting portion includes an outer peripheral cylindrical portion disposed on the same axis as the inner peripheral cylindrical portion, and another side surface portion extending from the outer peripheral cylindrical portion to the inner peripheral side. The annular space is formed between the inner peripheral cylindrical portion, the one side surface portion, the outer peripheral cylindrical portion, and the other side surface portion.

  The invention according to claim 7 is the armature winding of the three-phase synchronous motor according to any one of claims 1 to 6, wherein the three-phase legs of the inverter device are arranged rotationally symmetrical according to the phase sequence. Was matched to the number of legs.

  According to an eighth aspect of the present invention, in the seventh aspect, the number of the legs and the armature winding is any one of 3, 6, 9, and 18, respectively.

  In the invention of a capacitor and inverter-integrated three-phase synchronous motor device according to claim 1, a three-phase synchronous motor including a rotor and a stator, an annularly configured inverter device, and a capacitance accommodated in the annular space A capacitor provided with a portion is arranged on the central axis with the inverter device in between and integrated. These devices have matching shapes, and can be reduced in size and weight by adopting an integrated structure. Further, since the number of constituent members can be reduced and the length of the conductor for electrical connection can be shortened, the cost is reduced.

  In the invention according to claim 2, an annular cooling device is further provided on the central axis between the inverter device and the stator, and the inverter is mounted on the cooling surface of the cooling device. In the configuration in which the inverter device is forcibly cooled, by adopting the annular cooling device, the shape is matched and the effect of reducing the size and weight by integration becomes remarkable. Further, the cost can be reduced by using the annular cooling device also for cooling the motor.

  In the invention which concerns on Claim 3, the inverter apparatus and the capacitor | condenser are incorporated in the extension part which extended the housing of the motor to the back side. Therefore, since only one common housing is required instead of the individual housing, it is possible to realize a reduction in size and weight and cost.

  In the invention which concerns on Claim 4, a pair of bus bar arrange | positioned coaxially inside and outside is fixed to the wiring hole of the cover material of the back end part of an extension part, and direct-current power is supplied. The pair of bus bars arranged inside and outside the coaxial line has good electrical balance and the influence of stray inductance and stray capacitance is reduced, so that generation and radiation of induction noise and radio noise can be suppressed.

  In the invention which concerns on Claim 5, it is further provided with the rotation sensor which is provided in the front wall of a capacitor | condenser and protrudes in the inner peripheral space of an inverter apparatus, and detects rotation of a rotor. Therefore, it is possible to reduce the arrangement space of the rotation sensor and simplify the arrangement member, thereby contributing to reduction in size and weight and cost.

  In the invention according to claim 6, the annular space of the capacitor is formed between the inner peripheral cylindrical portion, the one side surface portion, the outer peripheral cylindrical portion, and the other side surface portion, and the capacity of the capacitor is increased in a limited installation space. it can.

  In the invention which concerns on Claim 7, the three-phase leg of an inverter apparatus is arrange | positioned rotationally symmetrical according to a phase order, and makes the number of armature windings of a three-phase synchronous motor correspond to the number of legs. Further, in the invention according to claim 8, the number of legs and armature windings is any of 3, 6, 9, and 18, respectively. Therefore, the legs and the armature windings can be connected in the shortest possible in a one-to-one correspondence. As a result, the interlinking area of the closed loop through which the motor current flows can be minimized and induction noise and radio noise can be suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view conceptually illustrating a capacitor and inverter-integrated three-phase synchronous motor device according to a first embodiment. FIG. 2 is a cross-sectional view perpendicular to the central axis of the three-phase synchronous motor viewed from the rear Z direction in FIG. 1. (1) is the external view of the cooling jacket seen from back X direction of FIG. 1, (2) is sectional drawing orthogonal to the central axis of the cooling jacket seen from back Y direction. It is side surface sectional drawing explaining the capacitor | condenser and inverter integrated three-phase synchronous motor apparatus of 2nd Embodiment. It is side surface sectional drawing explaining the capacitor | condenser and inverter integrated three-phase synchronous motor apparatus of 3rd Embodiment. It is side surface sectional drawing explaining the capacitor | condenser and inverter integrated three-phase synchronous motor apparatus of 4th Embodiment. It is a figure explaining the connection method with an inverter apparatus when a three-phase synchronous motor has three armature windings, (1) is a circuit diagram of an inverter apparatus, (2) is a connection diagram. It is a figure explaining the connection method with an inverter apparatus when a three-phase synchronous motor has six armature windings, (1) is a circuit diagram of an inverter apparatus, (2) is a connection diagram.

  A capacitor and inverter-integrated three-phase synchronous motor device 1 (hereinafter abbreviated as motor device 1) according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a side view conceptually illustrating the motor device 1 of the first embodiment. The motor device 1 includes a three-phase synchronous motor 3, an annular inverter device 4, and a capacitor 5 having a capacitance portion accommodated in the annular space, with the inverter device 4 in between and a central axis line It is arranged on the AX and integrated. Here, the three-phase synchronous motor 3 side (the right side in FIG. 1) is the front, and the capacitor 5 side (the left side in FIG. 1) is the rear (the same applies to the second and subsequent embodiments).

  As shown in FIG. 1, the motor device 1 further includes an annular cooling jacket 6 corresponding to a cooling device on the central axis AX between the inverter device 4 and the three-phase synchronous motor 3. It is arranged on the cooling surface on the rear side of the cooling jacket 6. The output shaft 33 of the three-phase synchronous motor 3 protrudes forward. In addition, a pair of bus bars 71 and 73 arranged on the inside and outside of the coaxial are connected from the rear to the capacitor 5 so as to supply DC power. The inverter device 4 converts DC power into three-phase power and outputs it to the three-phase synchronous motor 3.

  FIG. 2 is a cross-sectional view perpendicular to the central axis AX of the three-phase synchronous motor 3 as viewed from the rear Z direction of FIG. The three-phase synchronous motor 3 includes an inner rotor 31 and an outer stator 35. The rotor 31 includes a rotor core 32, an output shaft 33, four magnetic poles 34, and the like. The rotor core 32 is formed in a cylindrical shape by laminating a large number of annular electromagnetic steel plates, and the output shaft 33 is inserted so as to rotate integrally therewith. Further, around the output shaft 33 of the rotor core 32, four magnetic poles 34 are embedded so that N poles and S poles are alternately arranged at a pitch of 90 ° in the circumferential direction. The rotor 31 is rotatably supported by bearing members of a housing (not shown) at two locations on the front side and the rear side of the center axis AX.

  The stator 35 is disposed around the rotor 31 with a slight gap, and includes a stator core 36 and six armature windings 38. The stator core 36 is formed in a cylindrical shape by laminating a large number of electromagnetic steel plates larger than the rotor core 32 side, and is fixed to a cylindrical inner peripheral surface of a housing (not shown). The stator core 36 has six magnetic pole teeth 37 arranged at a 60 ° pitch in the circumferential direction and directed in the central direction. A conductor is wound around a slot around each magnetic pole tooth 37 to form a total of six armature windings 38 each including two phases. The six armature windings 38 are connected to the inverter device 4 in phase order.

  3A is an external view of the cooling jacket 6 viewed from the rear X direction of FIG. 1, and FIG. 3B is a cross-sectional view perpendicular to the central axis AX of the cooling jacket 6 viewed from the rear Y direction. The cooling jacket 6 is a part that cools the inverter device 4 by forcibly circulating cooling water. As shown in (1) of FIG. 3, the cooling jacket 6 has a center hole 61 at the position of the center axis AX and is formed in a hollow ring shape. Furthermore, fixing holes 62 extending in the axial direction are provided at three locations near the radial end of the cooling jacket 6 so as to be fixed to the housing.

  As shown in (2) of FIG. 3, the cooling jacket 6 has a water supply port 63 and a water discharge port 64 arranged on the outer peripheral edge. The inside of the cooling jacket 6 is partitioned by a partition wall 65 in the radial direction, and the cooling water flows clockwise in the figure. Further, the circumferential flow is divided by the circumferential flow dividing wall 66. The water supply port 63 and the drainage port 64 are communicated with a radiator (not shown), and cooling water is circulated by a water supply pump (not shown). The cooling water flows into the interior from the water supply port 63 and flows clockwise in the drawing to receive heat from the inverter device 4 and warm up. The warmed cooling water is discharged from the drain port 64 and flows into the radiator to be cooled. The cooled cooling water is supplied to the water supply port 63 again.

  In the motor device 1 according to the first embodiment, the shapes of the three-phase synchronous motor 3, the inverter device 4, and the capacitor 5 are matched, and by adopting an integrated structure, the device 1 can be reduced in size and weight. Further, since the number of constituent members can be reduced and the length of the conductor for electrical connection can be shortened, the cost is reduced. Moreover, since the annular cooling jacket 6 provided between the inverter device 4 and the three-phase synchronous motor 3 is also matched in shape, the effect of reducing the size and weight by integration becomes remarkable. Further, the pair of bus bars 71 and 73 arranged inside and outside the coaxial line for supplying DC power has good electrical balance and the influence of stray inductance and stray capacitance is reduced. Generation and radiation can be suppressed.

  Next, a capacitor and inverter-integrated three-phase synchronous motor device 1A (hereinafter abbreviated as motor device 1A) according to a second embodiment having a more specific structure will be described with reference to FIG. FIG. 4 is a side sectional view for explaining the motor device 1A of the second embodiment. The motor device 1 is configured such that a three-phase synchronous motor 3A, an inverter device 4A, a capacitor 5A, and a cooling jacket 6A are arranged on a central axis AX and integrated in the housing 2.

  As shown in FIG. 4, the housing 2 includes a motor housing portion 21 that accommodates the three-phase synchronous motor 3 </ b> A, and an extension housing portion 25 that accommodates the inverter device 4 </ b> A, the capacitor 5 </ b> A, and the cooling jacket 6 </ b> A. The motor housing part 21 is formed by a substantially cylindrical peripheral wall 211, an annular front wall 212, and an annular rear wall 213. Bearing members 22 and 23 are disposed in the center of the front wall 212 and the rear wall 213, respectively. Further, the rear wall 213 has a required number of connection holes 24 through which connection conductors 42, which will be described later, pass. The extension housing portion 25 is formed of a cylindrical extension peripheral wall 251 that is smaller in diameter than the peripheral wall 211 and extends from the rear wall 212 to the rear side in the central axis direction AX, and a lid member 252 that closes the rear end of the extension peripheral wall 251. Has been. A wiring hole 26 is formed in the center of the lid member 252.

  The three-phase synchronous motor 3A includes an inner circumferential rotor 31A and an outer circumferential stator 35A. The rotor 31A includes a rotor core 32A, an output shaft 33A, a magnetic pole (not shown), and the like. The rotor core 32A is formed in a cylindrical shape by laminating a large number of annular electromagnetic steel plates in the direction of the central axis AX, and the output shaft 33A is inserted through the center so as to integrally rotate. Furthermore, a magnetic pole (not shown) is embedded around the output shaft 33A of the rotor core 32A so that N poles and S poles are alternately arranged at an equal pitch. The rotor 31A is rotatably supported by bearing members 22 and 23 on the housing 2 side at two locations on the front side and the rear side.

  The stator 35A is disposed with a slight gap around the rotor 31A, and includes a stator core 36A, an armature winding 38A, and the like. The stator core 36 </ b> A is formed in a cylindrical shape by laminating a large number of annular electromagnetic steel plates larger than the rotor core 32 </ b> A side, and is fixed to the cylindrical inner peripheral surface of the peripheral wall 211. The stator core 36 </ b> A has magnetic pole teeth 37 </ b> A that are arranged at an equal pitch in the circumferential direction and go in the central direction. A conductor is wound around a slot around each magnetic pole tooth 37A to form an armature winding 38A.

  The cooling jacket 6A is formed in an annular shape around the central axis AX, and has a hollow rectangular cross section. The cooling jacket 6 </ b> A is fixed to the outer peripheral side of the bearing member 23 on the rear surface of the rear wall 213. The cooling water is forcedly circulated in the circumferential direction in the internal space of the cooling jacket 6A. The inverter device 4A is fixed to the rear surface 67 of the cooling jacket 6A.

  In the inverter device 4A, the three-phase upper arm and lower arm that perform power conversion by controlling the energization phase are configured by IGBT elements 41H and 41L (insulated gate bipolar transistor elements), respectively. As shown in the figure, the IGBT elements 41H and 41L have a laminated structure, and an emitter electrode E, a collector electrode C, an insulator I1, a connection conductor 42, and an insulator I2 are laminated in order from the left side in the drawing. The connection conductor 42 passes through the connection hole 24 of the rear wall 213 and is connected to the armature winding 38A of the three-phase synchronous motor 3A. In the IGBT element 41H on the upper arm side illustrated below the center axis AX in the drawing, the collector electrode C is connected to the positive electrode connection portion 52 of the capacitor 5A by the connection lead 43. In the IGBT element 41L on the lower arm illustrated above the center axis AX in the drawing, the emitter electrode E is connected to the negative electrode connection portion 53 of the capacitor 5A by the connection lead 44. For detailed internal structures and electrical characteristics of the IGBT elements 41H and 41L, refer to Patent Document 1 cited in the background art if necessary.

  The capacitor 5A is a cylindrical hollow cylinder capacitor having a hollow portion on the central axis AX. The capacitor 5A includes a positive electrode connection portion 52, a negative electrode connection portion 53, and a capacitance portion 54, and has a rotationally symmetric shape around the central axis AX. The positive electrode connecting portion 52 includes a cylindrical inner peripheral cylinder portion 521 and a positive electrode side surface portion 522 (one side surface portion) extending in an outward flange shape from one end portion of the inner peripheral cylinder portion 521. The negative electrode connecting portion 53 has a cylindrical outer peripheral cylindrical portion 531 and a negative electrode side surface portion 532 (another side surface portion) extending in an inward flange shape from the other end of the outer peripheral cylindrical portion 531. One end portion of the outer peripheral cylindrical portion 531 is expanded in diameter to form a large-diameter connection portion 533. The outer peripheral cylindrical portion 531 is held on the inner peripheral surface of the extended peripheral wall 251 using an insulating member 534.

  An annular space is formed between the inner peripheral cylindrical portion 521, the positive electrode side surface portion 522, the outer peripheral cylindrical portion 531, and the negative electrode side surface portion 532. The electrostatic capacitance part 54 is formed in a winding structure in which a positive electrode plate 541, a negative electrode plate 542, and a thin-film dielectric 543 are wound in a spiral shape inside an annular space. The positive electrode plate 541 is connected to the positive electrode side surface portion 522 of the positive electrode connection portion 52 and is close to the negative electrode side surface portion 532 of the negative electrode connection portion 53. The negative electrode plate 542 is connected to the negative electrode side surface portion 532 and is close to the positive electrode side surface portion 522. ing. Note that the internal structure of the capacitor 5A is not limited to the above, and may be, for example, a laminated structure.

  Further, a cylindrical inner connecting portion 55 that extends rearward through the wiring hole 26 of the lid member 252 is provided on the inner peripheral surface of the rear portion of the inner peripheral cylindrical portion 521. On the other hand, an outer taper member 56 is connected to the inner peripheral side of the large-diameter connection portion 533 of the outer peripheral cylindrical portion 531. The outer taper member 56 is first reduced radially inward, and then gradually reduced in a taper shape toward the rear, with the tapered tip passing through the wiring hole 26 and a cylindrical outer connection portion 57 having a constant diameter. It has become. A male screw 571 is engraved on the outer peripheral surface of the outer connecting portion 57. The outer taper member 56 is held by the lid member 252 using an insulating member 561. The inner connection portion 55 and the outer connection portion 57 are arranged inside and outside the coaxial line sharing the central axis AX, and a pair of bus bars 71 and 73 arranged inside and outside the coaxial line are connected.

  As shown in the drawing, an insulating layer 72 is provided on the outer peripheral surface of the central bus bar 71 to be insulated from the surrounding bus bar 73. The outer peripheral surface of the surrounding bus bar 73 is covered with another insulating layer 74. The front end of the center bus bar 71 is processed to be thin and a press-fit terminal portion 711 is formed. Further, an annular connecting nut 76 capable of relative rotation is provided at the front end of the peripheral bus bar 73. The rear side of the inner peripheral surface of the connecting nut 76 is in contact with the peripheral bus bar 73, and a female screw 761 that is screwed into the male screw 571 of the outer connection portion 57 is formed on the front side of the inner peripheral surface. The outer peripheral surface of the connecting nut 76 has a hexagonal shape and is rotated by a wrench.

  The unconnected center bus bar 71 and the peripheral bus bar 73 are advanced along the central axis direction AX toward the inner connection portion 55 and the outer connection portion 57, and the connection portion nut 76 is rotated to perform connection. As a result, the press-fit terminal portion 711 is press-fitted to the inner peripheral side of the inner connection portion 55, and the central bus bar 71 is connected to the positive electrode connection portion 52. Further, the connecting nut 76 is screwed into the outer connecting portion 57, and the peripheral bus bar 73 is connected to the negative electrode connecting portion 53. The rear end of the central bus bar 71 is connected to the positive terminal of the DC power source DC, and the rear end of the peripheral bus bar 73 is connected to the negative terminal of the DC power source DC. Thereby, the positive electrode connection part 52 becomes a positive electrode, and the negative electrode connection part 53 becomes a negative electrode. The central bus bar 71 and the peripheral bus bar 73 can be replaced with coaxial cables.

  A front wall 58 is provided on the front side of the capacitor 5 </ b> A, and the rotation sensor 8 is fixed on the front side of the front wall 58. The rotation sensor 8 is annular, protrudes into the inner circumferential space of the inverter device 4A, and faces the rear end of the output shaft 33A. A known resolver, a rotary encoder, or the like can be used as the rotation sensor 8, and the number of rotations of the rotor 31A of the three-phase synchronous motor 3A is detected.

  According to the motor device 1A of the second embodiment, the same effect as that of the first embodiment is generated, and the following effect is also generated. That is, since the three-phase synchronous motor 3A, the inverter device 4A, and the capacitor 5A are combined and integrated, a single common housing 2 can be used in place of individual housings, and the effect of reducing the size and weight and reducing the cost can be obtained. Become prominent. Further, since the rotation sensor 8 can be provided on the front side of the front wall 58 of the capacitor 5A by effectively utilizing the inner circumferential space of the inverter device 4A, the arrangement space of the rotation sensor 8 is reduced and the arrangement member is simplified. Therefore, it can contribute to reduction in size and weight and cost. In addition, the capacitance portion 54 can be formed in the annular space formed between the inner peripheral cylindrical portion 511, the positive electrode side surface portion 512, the outer peripheral cylinder portion 521, and the negative electrode side surface portion 522 of the capacitor 5A without causing a dead space. Capacitance can be increased in a limited space.

  Next, with respect to the motor devices 1B and 1C of the third and fourth embodiments, the dimensions of which are changed while following the structure of the motor device 1A of the second embodiment, the differences from the first and second embodiments are mainly described. Explained. FIG. 5 is a side sectional view for explaining the motor device 1B of the third embodiment, and FIG. 6 is a side sectional view for explaining the motor device 1C of the fourth embodiment.

  The motor device 1B of the third embodiment shown in FIG. 5 has a structure corresponding to an output request for a high rotational speed. The three-phase synchronous motor 3B has a relatively long shaft length with respect to the diameter, and therefore the inertia is small. Further, the number (number of poles) of the armature windings 38B is as small as three or six. Further, in line with the fact that the diameter of the three-phase synchronous motor 3B is reduced to be longer in the direction of the central axis AX, the inverter device 4B, the capacitor 5B, and the cooling jacket 6B are configured to have substantially the same diameter as the three-phase synchronous motor 3B. In particular, it extends in the direction of the central axis AX. Therefore, in the housing 2B, the peripheral wall 211B and the extended peripheral wall 251B have the same outer diameter, and the manufacture is easy and the cost is reduced.

  In FIG. 5, the relay conductor 28 is drawn downward through the extended peripheral wall 251 </ b> B in the drawing. The relay conductor 28 is a member for supplying the DC power supplied to the capacitor 5B to other than the inverter device 4B.

  Further, the motor device 1C of the fourth embodiment shown in FIG. 6 has a structure corresponding to an output request for large torque. The three-phase synchronous motor 3C has a relatively large diameter with respect to the axial length, and hence the inertia is large. Further, the number of armature windings 38B (number of poles) is multipolar, such as 18. Further, in line with the increase in diameter of the three-phase synchronous motor 3B, the inverter device 4C, the capacitor 5C, and the cooling jacket 6C are configured to have substantially the same diameter as the three-phase synchronous motor 3C, and are thin in the direction of the central axis AX. It has become. Therefore, in the housing 2C, the peripheral wall 211C and the extended peripheral wall 251C have the same outer diameter, and the manufacture is easy and the cost is reduced.

  According to the motor devices 1B and 1C of the third and fourth embodiments, the capacitors 5B and 5C are provided so as to ensure the required capacitance value and low impedance value according to the structure of the three-phase synchronous motors 3B and 3C. Can be designed. Thereby, the capacitors 5B and 5C can respond well to the required current of the inverter devices 4B and 4C, and the motor devices 1B and 1C operate stably. The remaining effects of the motor devices 1B and 1C of the third and fourth embodiments are the same as those of the first and second embodiments, and thus the description thereof is omitted.

  Next, a connection method between the three-phase synchronous motor and the inverter device will be described by taking the configuration of the third embodiment as an example. FIG. 7 is a diagram for explaining a connection method with the inverter device 4D when the three-phase synchronous motor 3D has three armature windings 38U, 38V, and 38W. (1) is a circuit diagram of the inverter device 4D. , (2) is a connection diagram. FIG. 8 is a diagram for explaining a connection method with the inverter device 4E when the three-phase synchronous motor 3E has six armature windings. (1) is a circuit diagram of the inverter device 4E. ) Is a connection diagram. (2) in FIG. 7 and (2) in FIG. 8 are the schematic views of the R direction view and the S direction view in FIG.

  When the three-phase synchronous motor 3D has a total of three armature windings, one for each of the three phases, each phase is composed of a single upper arm and lower arm 6 as shown in FIG. An arm inverter device 4D is used. Each of the six IGBT elements 41H and 41L constituting the upper arm and the lower arm of each phase of the inverter device 4D is connected to six equilateral triangular power semiconductor chips as shown in (2) of FIG. The regular hexagonal shape is used. Further, the upper arm and the lower arm of each phase are adjacent to each other in the circumferential direction, and are arranged in order according to the phase order.

  Specifically, the U-phase upper arm IGBT element 41HU, the V-phase lower arm IGBT element 41LV, the V-phase upper arm IGBT element 41HV, the W-phase lower arm IGBT element 41LW, and the W-phase upper edge in the clockwise direction in the drawing at a pitch of 60 °. The arm IGBT element 41HW and the U-phase lower arm IGBT element 41LU are arranged in this order. These are connected to the positive electrode connection part 52 which is a center side positive electrode and the negative electrode connection part 53 which is an outer peripheral side negative electrode. Further, output conductors 45U, 45W, 45W of each phase extending in the radial direction as legs are disposed between the upper arm and the lower arm of each phase. The rectifier diode shown in (1) of FIG. 7 is shown by two equilateral triangles in (2) of FIG. For the detailed configuration of the inverter device 4D, refer to Patent Document 1 cited in the background art if necessary.

  On the other hand, in the stator 35D of the three-phase synchronous motor 3D, one armature winding 38U, 38V, 38W for each of the three phases is arranged rotationally symmetrically at a 120 ° pitch in accordance with the phase order. The number of armature windings 38U, 38V, and 38W is equal to the number of output conductors 45U, 45W, and 45W that are legs. In addition, in-phase armature windings 38U, 38V, 38W and output conductors 45U, 45V, 45W are arranged so as to be aligned in the central axis AX direction. Therefore, the connecting conductors 42U, 42V, and 42W that connect the two may be extended in the direction of the central axis AX, and the routing in the circumferential direction is unnecessary and is minimized.

  When the three-phase synchronous motor 3E has a total of six armature windings, two for each of the three phases, as shown in (1) of FIG. 8, each phase is made up of two parallel upper and lower arms 12 An arm inverter device 4E is used. Each of the 12 IGBT elements 41H and 41L constituting the upper arm and the lower arm of each phase of the inverter device 4E is composed of three equilateral triangular power semiconductor chips as shown in FIG. 8 (2). It is an isosceles trapezoid. In addition, the upper arm IGBT element 41H and the lower arm IGBT element 41L are adjacent to each other with long bottoms having an isosceles trapezoidal shape and are formed in a regular hexagonal shape, with the former disposed on the inner circumferential side and the latter disposed on the outer circumferential side. (Exemplified with only one place in the figure)

  The IGBT element 41H of the upper arm is connected to the positive electrode connection portion 52 that is the center-side positive electrode, and the IGBT element 41L of the lower arm is connected to the negative electrode connection portion 53 that is the outer peripheral side negative electrode. Further, as the leg between each upper arm and lower arm, two output conductors 45U1, 45U2, 45V1, 45V2, 45W1, 45W2 for each phase are arranged on the outer peripheral side of each IGBT element 41L of the lower arm. Yes. Note that the rectifier diode shown in (1) of FIG. 8 is shown by one equilateral triangle in (2) of FIG.

  On the other hand, in the stator 35D of the three-phase synchronous motor 3D, a total of six armature windings 38U1, 38U2, 38V1, 38V2, 38W1, and 38W2 of each two of the three phases are arranged rotationally symmetrically at a 60 ° pitch in phase order. Has been. The number of armature windings 38U1, 38U2, 38V1, 38V2, 38W1, and 38W2 is equal to the number of output conductors 45U1, 45U2, 45V1, 45V2, 45W1, and 45W2 that are legs. In addition, in-phase armature windings 38U1, 38U2, 38V1, 38V2, 38W1, and 38W2 and output conductors 45U1, 45U2, 45V1, 45V2, 45W1, and 45W2 are arranged in the center axis AX direction. Therefore, the connection conductors 42U1, 42U2, 42V1, 42V2, 42W1, and 42W2 that connect the two are only required to extend in the direction of the central axis AX, and the routing in the circumferential direction becomes unnecessary and is minimized.

  Further, in the fourth embodiment, when there are a total of 18 armature windings 38C, for example, each of 6 pieces in 3 phases, the same configuration can be adopted, and the connection conductor 42 can be minimized. In other words, the legs and the armature windings can be connected in the shortest possible in a one-to-one correspondence. As a result, the closed loop linkage area of the motor current flowing from the inverter devices 4D and 4E to the three-phase synchronous motors 3D and 3E can be minimized, and induction noise and radio wave noise can be suppressed.

  The capacitor and inverter-integrated three-phase synchronous motor devices 1, 1A, 1B, and 1C of each embodiment are suitable for mounting on a hybrid vehicle, and can also be used for other applications. The present invention can have various other applications and modifications.

1, 1A, 1B, 1C: capacitor and inverter integrated three-phase synchronous motor device 2, 2B, 2C: housing
21: Motor housing part 211, 211B, 211C: Perimeter wall
212: Front wall 213: Rear wall 22, 23: Bearing member 24: Connection hole
25: Extension housing part 251, 251B, 251C: Extension peripheral wall
252: Cover material 26: Wiring hole 3, 3A, 3B, 3C, 3D, 3E: Three-phase synchronous motor
31, 31A: Rotor 32, 32A: Rotor core
33, 33A: Output shaft 34: Magnetic pole
35, 35A: Stator 36, 36A: Stator core
37, 37A: Magnetic teeth 38, 38A, 38B, 38C: Armature winding
38U, 38V, 38W: Armature winding
38U1, 38U2, 38V1, 38V2, 38W1, 38W2: Armature winding 4, 4A, 4B, 4C, 4D, 4E: Inverter device
41H, 41L: IGBT element
42, 42U, 42V, 42W: Connection conductor
42U1, 42U2, 42V1, 42V2, 42W1, 42W2: connecting conductor
43, 44: Connection lead
45U, 45W, 45W: Output conductor
45U1, 45U2, 45V1, 45V2, 45W1, 45W2: Output conductor 5, 5A, 5B, 5C: Capacitor
52: Positive electrode connection portion 53: Negative electrode connection portion
54: Capacitance part 541: Positive electrode plate 542: Negative electrode plate
55: Inner connection part 56: Outer taper member 57: Outer connection part 6, 6A, 6B, 6C: Cooling jacket (cooling device)
61: Center hole 62: Fixed hole 63: Water supply port 64: Drainage port
65: Partition wall 66: Dividing wall 71: Central bus bar 73: Surrounding bus bar 76: Connection nut 8: Rotation sensor AX: Center axis

Claims (8)

A three-phase synchronous motor comprising a rotor rotatably supported around a central axis in a housing and a stator in which a three-phase armature winding is disposed around the rotor and fixed to the housing;
A power semiconductor module for controlling the energization phase, each of which includes a three-phase upper arm and a lower arm connected to a DC power source, and each leg between the three-phase upper arm and the lower arm corresponds to each electric machine of the stator An inverter device connected to each of the child windings and configured annularly around the central axis;
A capacitance section accommodated in an annular space formed coaxially with the central axis, and connected to a positive terminal of the DC power supply and extending along one of an inner circumferential surface and an outer circumferential surface of the annular space, and the inverter Connected to the positive electrode terminal of the device and the positive electrode plate of the electrostatic capacity unit, and connected to the negative electrode terminal of the DC power supply and extends along the other of the inner peripheral surface and the outer peripheral surface of the annular space. A capacitor having a negative electrode connection portion connected to a negative electrode terminal of the inverter device and a negative electrode plate of the capacitance portion,
A capacitor and an inverter-integrated three-phase synchronous motor device arranged and integrated on the central axis with the inverter device interposed therebetween.   2. The apparatus according to claim 1, further comprising an annular cooling device on the central axis between the inverter device and the stator, wherein the inverter device is disposed on a cooling surface of the cooling device and the inverter integrated type three Phase synchronous motor device.   3. The inverter device and the capacitor according to claim 1, wherein the outer peripheral wall of the housing is incorporated in an extended portion of the rotor extending from the rear wall bearing the inverter device side to the rear side in the central axis direction. Capacitor and inverter integrated three-phase synchronous motor device.   4. A pair of bus bars arranged coaxially and externally is fixed to a wiring hole formed on the central axis of a lid member that closes a rear end portion of the extended portion according to claim 3, and one end of one bus bar is connected to the DC A capacitor connected to the positive electrode of the power supply, the other end connected to the positive electrode connection of the capacitor, one end of the other bus bar connected to the negative electrode of the DC power supply, and the other end connected to the negative electrode connection of the capacitor; Inverter-integrated three-phase synchronous motor device.   5. The capacitor and the inverter according to claim 3, further comprising a rotation sensor provided on a front wall of the capacitor facing the three-phase synchronous motor and projecting into an inner peripheral space of the inverter device to detect rotation of the rotor. Body type three-phase synchronous motor device. In any one of Claims 1-5, one of the said positive electrode connection part and the said negative electrode connection part is provided with the one side part extended to an outer peripheral side from an inner peripheral cylinder part, and this inner peripheral cylinder part,
The other of the positive electrode connecting portion and the negative electrode connecting portion includes an outer peripheral cylindrical portion arranged on the same axis as the inner peripheral cylindrical portion and another side surface portion extending from the outer peripheral cylindrical portion to the inner peripheral side,
The annular space is a three-phase synchronous motor device integrated with a capacitor and an inverter formed between the inner peripheral cylindrical portion, the one side surface portion, the outer peripheral cylindrical portion, and the other side surface portion.   7. The three-phase leg of the inverter device according to claim 1, wherein the three-phase legs of the inverter device are rotationally symmetrical according to the phase order, and the number of the armature windings of the three-phase synchronous motor is set to the number of the legs. Three-phase synchronous motor device with integrated capacitor and inverter.   8. The capacitor and inverter-integrated three-phase synchronous motor device according to claim 7, wherein the number of the legs and the armature windings is any of 3, 6, 9, and 18, respectively.

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