WO2023238312A1 - Rotor de machine électrodynamique, machine électrodynamique et véhicule électrique équipé d'une machine électrodynamique - Google Patents

Rotor de machine électrodynamique, machine électrodynamique et véhicule électrique équipé d'une machine électrodynamique Download PDF

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Publication number
WO2023238312A1
WO2023238312A1 PCT/JP2022/023244 JP2022023244W WO2023238312A1 WO 2023238312 A1 WO2023238312 A1 WO 2023238312A1 JP 2022023244 W JP2022023244 W JP 2022023244W WO 2023238312 A1 WO2023238312 A1 WO 2023238312A1
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Prior art keywords
magnet
rotor
magnetic
electric machine
rotating electrical
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PCT/JP2022/023244
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English (en)
Japanese (ja)
Inventor
幸広 吉成
徳昭 日野
拓弥 宮城
広樹 成島
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日立Astemo株式会社
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Priority to PCT/JP2022/023244 priority Critical patent/WO2023238312A1/fr
Publication of WO2023238312A1 publication Critical patent/WO2023238312A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]

Definitions

  • the present invention relates to a rotor of a rotating electrical machine, a rotating electrical machine, and an electric vehicle equipped with this rotating electrical machine.
  • a rotating electric machine includes a stator and a rotor that rotates on the inner circumferential side of the stator.
  • a magnet insertion hole is formed in the rotor core that constitutes the rotor, and a magnet is inserted into the magnet insertion hole.
  • the magnets have two layers in the radial direction and are arranged in a V-shape. Since the magnet insertion hole is formed larger than the magnet, a space is formed at the end of the magnet. This space functions as a magnetic space that suppresses leakage magnetic flux.
  • Patent Document 1 the technique described in Patent Document 1 is disclosed.
  • Patent Document 2 In addition to the above-described configuration, there is a technique described in Patent Document 2 in which a magnet insertion hole is provided on the q-axis passing through the center between the magnetic poles, and a magnet is purchased for the magnet insertion hole.
  • a space formed by a magnet insertion hole and a magnet on the q-axis and a space formed separately from this space on the q-axis function as a magnetic space.
  • a magnet is inserted into a V-shaped magnet insertion hole, and a through hole that axially penetrates the rotor core is formed between the two V-shaped magnet insertion holes. ing.
  • the through hole is formed with a vertical portion extending in the radial direction between the two magnet insertion holes and an oblique portion extending to a position intersecting the central axis of the main magnetic flux plane of the magnet.
  • the through hole functions as a magnetic space that suppresses leakage magnetic flux.
  • JP2018-82540A International Publication No. 2015/076045 JP2021-97457A
  • rotating electric machines are required to have higher maximum torque and faster rotation.
  • it is effective to form magnetic spaces in order to suppress leakage magnetic flux and to narrow the distance between the bridge portions between the magnetic spaces.
  • the mechanical strength of the rotor core decreases, and the rotor core lacks strength against stress generated during high-speed rotation. In this way, in rotating electric machines, there is a trade-off relationship between maximum torque and stress.
  • Patent Documents 1 to 3 have been disclosed, but rotating electric machines are required to further improve maximum torque and stress for high-speed rotation.
  • An object of the present invention is to provide a new rotating electric machine structure for improving maximum torque and rotor core strength.
  • the present invention provides a rotor for a rotating electric machine including a magnet and a rotor core in which a magnet insertion hole into which the magnet is inserted is formed, wherein the magnet is a first magnet. and a second magnet arranged in a V-shape inside the first magnet in the radial direction, and the rotor core includes a first magnetic magnet facing the radially inner side surface of the second magnet. an air gap, a first bridge portion formed between the first magnetic air gap on the magnetic pole center, and a radially outer side of the first bridge portion and closer to the magnetic pole center of the second magnet. A second magnetic gap is formed on the side via a second bridge portion.
  • FIG. 1 is a diagram showing a schematic configuration of a hybrid electric vehicle equipped with a rotating electric machine according to an embodiment of the present invention.
  • 2 is a circuit diagram of a power conversion device 600 in FIG. 1.
  • FIG. FIG. 2 is a cross-sectional view of the rotating electric machine 200 of FIG. 1 taken in the axial direction.
  • 4 is a sectional view taken along the line IV-IV in FIG. 3.
  • FIG. 5 is an enlarged view of the V section in FIG. 4.
  • FIG. 3 is an enlarged view of a rotor related to Comparative Example 1.
  • FIG. FIG. 3 is a diagram showing lines of magnetic force and magnetic flux density distribution of a rotor according to an example of the present invention.
  • FIG. 3 is a diagram showing lines of magnetic force and magnetic flux density distribution of a rotor according to Comparative Example 1.
  • FIG. It is a figure showing the stress distribution of the rotor core concerning an example of the present invention.
  • 3 is a diagram showing stress distribution of a rotor core according to Comparative Example 1.
  • FIG. 7 is a diagram showing stress distribution of a rotor core according to Comparative Example 2.
  • the various components of the present invention do not necessarily have to exist independently, and one component may be made up of multiple members, multiple components may be made of one member, or a certain component may be different from each other. It is allowed that a part of a certain component overlaps with a part of another component, etc.
  • the rotating electrical machine according to the present invention can be applied to a pure electric vehicle that runs only by the rotating electrical machine, or a hybrid electric vehicle that is driven by both an engine and a rotating electrical machine, but below, a hybrid electric vehicle will be used as an example. explain.
  • FIG. 1 is a diagram showing a schematic configuration of a hybrid electric vehicle equipped with a rotating electric machine according to an embodiment of the present invention.
  • the vehicle 100 is equipped with an engine 120, a first rotating electrical machine 200, a second rotating electrical machine 300, and a battery 180.
  • the battery 180 supplies DC power to the rotating electrical machines 200, 300 via the power conversion device 600 when driving force from the rotating electrical machines 200, 300 is required, and receives DC power from the rotating electrical machines 200, 300 during regenerative running. .
  • Direct current power is exchanged between the battery 180 and the rotating electric machines 200 and 300 via the power conversion device 600.
  • the vehicle is equipped with a battery that supplies low-voltage power (for example, 14-volt power), and supplies DC power to a control circuit described below.
  • the rotational torque from the engine 120 and the rotating electric machines 200, 300 is transmitted to the front wheels 110 (wheels) via the transmission 130 and differential gear 160.
  • Front wheels 110 (wheels) are driven by an engine 120 and rotating electric machines 200, 300.
  • Transmission 130 is controlled by transmission control device 134
  • engine 120 is controlled by engine control device 124.
  • Battery 180 is controlled by battery control device 184.
  • Transmission control device 134, engine control device 124, battery control device 184, power conversion device 600, and integrated control device 170 are connected by communication line 174.
  • the integrated control device 170 is a control device at a higher level than the transmission control device 134, the engine control device 124, the power conversion device 600, and the battery control device 184. and information representing each state of the battery control device 184 are received from them via the communication line 174.
  • the integrated control device 170 calculates control commands for each control device based on the acquired information. The calculated control commands are transmitted to each control device via the communication line 174.
  • the high voltage battery 180 is composed of a secondary battery such as a lithium ion battery or a nickel metal hydride battery, and outputs high voltage DC power of 250 volts to 600 volts or more.
  • the battery control device 184 outputs the charging/discharging status of the battery 180 and the status of each unit cell battery forming the battery 180 to the integrated control device 170 via the communication line 174.
  • the integrated control device 170 determines that charging the battery 180 is necessary based on the information from the battery control device 184, it issues an instruction to the power conversion device 600 to perform power generation operation.
  • the integrated control device 170 mainly manages the output torque of the engine 120 and the rotating electric machines 200, 300, and calculates the total torque and torque distribution ratio between the output torque of the engine 120 and the output torque of the rotating electric machines 200, 300. and transmits a control command based on the result of the arithmetic processing to transmission control device 134, engine control device 124, and power conversion device 600.
  • Power conversion device 600 controls rotating electric machines 200 and 300 based on the torque command from integrated control device 170 so that torque output or generated power is generated as instructed.
  • the power conversion device 600 is provided with a power semiconductor that constitutes an inverter for operating the rotating electric machines 200 and 300.
  • Power conversion device 600 controls switching operations of power semiconductors based on commands from integrated control device 170. By this switching operation of the power semiconductors, the rotating electric machines 200, 300 are operated as electric motors or generators.
  • DC power from the high-voltage battery 180 is supplied to the DC terminals of the inverter of the power conversion device 600.
  • the power conversion device 600 controls the switching operation of the power semiconductor, converts the supplied DC power into three-phase AC power, and supplies the three-phase AC power to the rotating electric machines 200 and 300.
  • the rotors of the rotating electric machines 200, 300 are rotationally driven by rotational torque applied from the outside, and the stator windings of the rotating electric machines 200, 300 are driven to rotate in three phases. AC power is generated.
  • the generated three-phase AC power is converted into DC power by the power conversion device 600, and the DC power is supplied to the high voltage battery 180, thereby charging the battery 180.
  • FIG. 2 is a circuit diagram of the power conversion device 600 of FIG. 1.
  • the power conversion device 600 is provided with a first inverter device for the rotating electrical machine 200 and a second inverter device for the rotating electrical machine 300.
  • the first inverter device includes a power module 610, a first drive circuit 652 that controls the switching operation of each power semiconductor 21 of the power module 610, and a current sensor 660 that detects the current of the rotating electric machine 200.
  • the drive circuit 652 is provided on the drive circuit board 650.
  • the second inverter device includes a power module 620, a second drive circuit 656 that controls the switching operation of each power semiconductor 21 in the power module 620, and a current sensor 662 that detects the current of the rotating electric machine 300.
  • a drive circuit 656 is provided on a drive circuit board 654.
  • a control circuit 648 provided on the control circuit board 646, a capacitor module 630, and a transmitting/receiving circuit 644 mounted on the connector board 642 are used in common by the first inverter device and the second inverter device.
  • the power modules 610 and 620 are operated by drive signals output from corresponding drive circuits 652 and 656, respectively.
  • Power modules 610 and 620 each convert DC power supplied from battery 180 into three-phase AC power, and supply the power to stator windings that are armature windings of corresponding rotating electric machines 200 and 300. Further, the power modules 610 and 620 convert AC power induced in the stator windings of the rotating electric machines 200 and 300 into DC power, and supply the DC power to the high voltage battery 180.
  • the power modules 610 and 620 are equipped with a three-phase bridge circuit as shown in FIG. 2, and series circuits corresponding to three phases are electrically connected in parallel between the positive electrode side and the negative electrode side of the battery 180, respectively. ing.
  • Each series circuit includes a power semiconductor 21 constituting an upper arm and a power semiconductor 21 constituting a lower arm, and these power semiconductors 21 are connected in series.
  • the power module 610 and the power module 620 have substantially the same circuit configuration as shown in FIG. 2, and herein, the power module 610 will be explained as a representative.
  • an IGBT (insulated gate bipolar transistor) 21 is used as a switching power semiconductor element.
  • the IGBT 21 includes three electrodes: a collector electrode, an emitter electrode, and a gate electrode.
  • a diode 38 is electrically connected between the collector electrode and the emitter electrode of the IGBT 21.
  • the diode 38 has two electrodes, a cathode electrode and an anode electrode, and the cathode electrode is connected to the collector electrode of the IGBT 21 and the anode electrode is connected to the collector electrode of the IGBT 21 so that the direction from the emitter electrode to the collector electrode of the IGBT 21 is the forward direction.
  • Each is electrically connected to an emitter electrode.
  • MOSFET metal oxide semiconductor field effect transistor
  • a MOSFET includes three electrodes: a drain electrode, a source electrode, and a gate electrode.
  • a parasitic diode is provided between the source electrode and the drain electrode, and the forward direction is from the drain electrode to the source electrode, so there is no need to provide the diode 38 in FIG. 2.
  • the arm of each phase is constructed by electrically connecting the emitter electrode of the IGBT 21 and the collector electrode of the IGBT 21 in series.
  • IGBT 21 the emitter electrode of the IGBT 21 and the collector electrode of the IGBT 21 in series.
  • IGBTs are electrically connected in parallel. ing. In the following, in order to simplify the explanation, it will be explained as one power semiconductor.
  • each upper and lower arm of each phase is composed of three IGBTs.
  • the collector electrode of each upper arm IGBT 21 of each phase is electrically connected to the positive electrode side of the battery 180, and the source electrode of each lower arm IGBT 21 of each phase is electrically connected to the negative electrode side of the battery 180.
  • the midpoint of each arm of each phase (the connection point between the emitter electrode of the upper arm side IGBT and the collector electrode of the lower arm side IGBT) is connected to the armature winding (fixed electrically connected to the child winding).
  • the drive circuits 652 and 656 constitute a drive section for controlling the corresponding inverter devices (power modules 610 and 620), and are for driving the IGBT 21 based on the control signal output from the control circuit 648. Generates a drive signal.
  • the drive signals generated by the respective drive circuits 652 and 656 are output to the gates of the respective power semiconductor elements of the corresponding power modules 610 and 620, respectively.
  • the drive circuits 652 and 656 are each provided with six integrated circuits that generate drive signals to be supplied to the gates of the upper and lower arms of each phase, and each of the six integrated circuits is configured as one block.
  • the control circuit 648 constitutes a control section of each inverter device (power module 610, 620), and is a microcontroller that calculates control signals (control values) for operating (on/off) multiple switching power semiconductor elements. It is composed by a computer.
  • a torque command signal (torque command value) from a higher-level control device, sensor outputs of current sensors 660 and 662, and sensor outputs of rotation sensors mounted on rotating electric machines 200 and 300 are input to control circuit 648.
  • Control circuit 648 calculates control values based on these input signals, and outputs control signals for controlling switching timing to drive circuits 652 and 656.
  • the transmitting/receiving circuit 644 mounted on the connector board 642 is for electrically connecting the power conversion device 600 and an external control device, and transmits information to other devices via the communication line 174 in FIG. Send and receive.
  • the capacitor module 630 constitutes a smoothing circuit for suppressing fluctuations in DC voltage caused by the switching operation of the IGBT 21, and is electrically connected to the DC side terminals of the first power module 610 and the second power module 620. connected in parallel.
  • FIG. 3 is a cross-sectional view of the rotating electrical machine 200 of FIG. 1. Note that the rotating electrical machine 200 and the rotating electrical machine 300 have substantially the same structure, and the structure of the rotating electrical machine 200 will be described below as a representative example. However, the structure shown below does not need to be adopted in both rotating electric machines 200 and 300, and may be adopted in only one.
  • the direction along the shaft is defined as the "axial direction”
  • the circumference around the shaft is defined as the “circumferential direction”
  • the radial direction (radial direction) with the shaft as the center is defined as the "radial direction”.
  • a stator 230 is held inside the housing 202, and the stator 230 includes a stator core 232 and a stator winding 234 disposed on the stator core 232.
  • a rotor 250 is rotatably held on the inner peripheral side of the stator core 232 with a gap G1 interposed therebetween.
  • the rotor 250 includes a rotor core 252 fixed to a shaft 260, a magnet 254 (permanent magnet) inserted into a magnet insertion hole of the rotor core 252, and non-magnetic end plates 226, 228. There is.
  • the housing 202 has a pair of end brackets 214 provided with bearings 216 and 218, and the shaft 260 is rotatably held by these bearings 216 and 218.
  • the shaft 260 is provided with a resolver 224 that detects the pole position and rotational speed of the rotor 250.
  • the output from this resolver 224 is taken into the control circuit 648 shown in FIG.
  • Control circuit 648 outputs a control signal to drive circuit 652 based on the captured output.
  • Drive circuit 652 outputs a drive signal to power module 610 based on the control signal.
  • Power module 610 performs a switching operation based on a control signal and converts DC power supplied from battery 180 into three-phase AC power. This three-phase AC power is supplied to the stator winding 234 shown in FIG. 3, and a rotating magnetic field is generated in the stator 230.
  • the frequency of the three-phase alternating current is controlled based on the output value of the resolver 224, and the phase of the three-phase alternating current with respect to the rotor 250 is also controlled based on the output value of the resolver 224.
  • rotating electric machines are required to have higher maximum torque and faster rotation.
  • it is effective to form magnetic spaces in order to suppress leakage magnetic flux and to narrow the distance between the bridge portions between the magnetic spaces.
  • the mechanical strength of the rotor core decreases, and the rotor core lacks strength against stress generated during high-speed rotation. In this way, in rotating electric machines, there is a trade-off relationship between maximum torque and stress. Means for solving these problems will be explained below.
  • FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 3.
  • FIG. 5 is an enlarged view of the V section in FIG. 4. Note that the housing 202 is omitted in FIG. 5.
  • the stator 230 is formed with a plurality of slots 235 that open radially inward and teeth 236 that are formed between adjacent slots 235.
  • a stator winding 234 is arranged in the slot 235 and wound around teeth 236.
  • the axis passing through the center of the magnetic poles is called the d-axis
  • the axis passing through the magnetic pole boundary is called the q-axis.
  • the rotor core 252 is formed with a plurality of first magnet insertion holes 255a and a plurality of second magnet insertion holes 255b located radially inward from the first magnet insertion holes 255a.
  • Two first magnet insertion holes 255a are arranged in a V-shape at a predetermined angle with respect to the d-axis within one pole, and two (plurality) of first magnets 254a are housed in each.
  • Two second magnet insertion holes 255b are arranged in a V-shape at a predetermined angle with respect to the d-axis within one pole, and two (plurality) of second magnets 254b are housed in each.
  • the first magnet 254a has a larger opening angle than the second magnet 254b.
  • the first magnets 254a are arranged in a V-shape at a predetermined angle with respect to the d-axis, they may be arranged perpendicularly (180°) with respect to the d-axis. It may be formed by
  • a plurality of magnetic gaps are formed in order to suppress leakage magnetic flux and improve torque.
  • a magnetic gap 263a is formed at one end of the first magnet 254a located on the radially inner side (on the d-axis side), and a magnetic gap 263a is formed on the other end side of the first magnet 254a on the radially outer side (on the q-axis side).
  • a target gap 263b is formed.
  • the magnetic air gap 263a faces the radially inner side surface of the first magnet 254a
  • the magnetic air gap 263b faces the radially outer side surface of the first magnet 254a.
  • a magnetic gap 256a (first magnetic gap) is formed at one end side of the second magnet 254b located on the radially inner side (on the d-axis side), and a second magnet 254b on the radially outer side (on the q-axis side) is formed.
  • a magnetic gap 256b is formed at the other end.
  • the magnetic gap 256a (first magnetic gap) faces the radially inner side surface of the second magnet 254b
  • the magnetic gap 256b faces the radially outer side surface of the second magnet 254b.
  • the magnetic gap 256a (first magnetic gap) is formed to protrude radially inward from an extension line extending toward the d-axis side of the radially inner side 254b1 of the second magnet 254b. .
  • the magnetic gap 256a (first magnetic gap) is formed by a curved line 256a1 extending radially inward from the d-axis side end of the radially inner side 254b1 of the second magnet 254b.
  • the magnetic gap 256a (first magnetic gap) extends toward the d-axis side while drawing a curve 256a1, and then changes direction and extends toward the q-axis side.
  • the curve 256a1 forming the magnetic gap 256a (first magnetic gap) is connected to a part of the radially inner side surface 254b2 (d-axis side) of the second magnet 254b.
  • a magnet stop portion 263 is formed on the radially inner side surface 254b2 of the second magnet 254b on the radially outer side of the magnetic gap 256a (first magnetic gap) to suppress movement of the second magnet 254b radially inward. are doing.
  • a first bridge portion 258 is formed on the d-axis (above the center of the magnetic pole) and between the magnetic gaps 256a (first magnetic gaps).
  • a magnetic gap 257 (a second magnetic gap) formed via a second bridge part 259 is located on the radially outer side of the first bridge part 258 and closer to the d-axis (magnetic pole center) of the second magnet 254b. voids) are formed.
  • the second bridge portion 259 is formed by one side of the magnetic gap 257 (second magnetic gap) and a magnet stop portion 263 that contacts the radially inner side surface of the second magnet 254b.
  • a plurality of holes 262 are formed in the rotor core 252 at positions radially inside the magnetic gap 256a (first magnetic gap).
  • the plurality of holes 262 are formed to reduce the weight of the rotor core 252. Further, the plurality of holes 262 are formed at positions that do not overlap with the d-axis (the center of the magnetic pole).
  • FIG. 6 is an enlarged view of the rotor regarding Comparative Example 1.
  • similar components are given the same reference numerals as those in this embodiment, and detailed explanation thereof will be omitted.
  • Comparative Example 1 shown in FIG. 6 is different from the present example shown in FIG. 5 in that the shape of the magnetic gap 256a and the hole 262a are formed at a position overlapping with the d-axis (the center of the magnetic pole). There is.
  • the magnetic gap 256a is formed by a curved line 256a2 extending radially outward from the d-axis side end of the radially outer side 254b2 of the second magnet 254b.
  • the magnetic gap 256a extends toward the d-axis side while drawing a curve 256a2, and then changes direction and extends toward the q-axis side.
  • a hole 262a is formed at a position overlapping with the d-axis (center of the magnetic pole).
  • the distance (the width of the first bridge portion 258) between the magnetic gaps 256a facing each other with the d-axis (magnetic pole center) in between is the same as the distance W2 between the magnetic gaps 256a in Comparative Example 1 compared to the distance W2 between the magnetic gaps 256a in Comparative Example 1.
  • the distance W1 between the gaps 256a is wide (W2 ⁇ W1).
  • FIG. 7 is a diagram showing lines of magnetic force and magnetic flux density distribution of a rotor according to an example of the present invention.
  • FIG. 8 is a diagram showing magnetic lines of force and magnetic flux density distribution of the rotor according to Comparative Example 1.
  • Magnetic lines of force are generated to avoid each magnetic gap.
  • the distance between the magnetic gaps 256a width of the first bridge portion 258) is formed wider than in the structure of Comparative Example 1, so leakage magnetic flux is likely to occur. Therefore, in this embodiment, a magnetic gap 257 (second magnetic gap) is formed on the radially outer side of the first bridge portion 258 and closer to the d-axis (magnetic pole center) of the second magnet 254b. ing.
  • the second bridge portion 259 is formed by one side of the magnetic gap 257 (second magnetic gap) and the magnet stop portion 263 that contacts the radially inner side surface of the second magnet 254b. As shown in FIG. 7, it becomes difficult for magnetic flux to pass through this second bridge portion 259. Thereby, leakage magnetic flux is suppressed, and a decrease in the maximum torque of the rotating electric machine can be suppressed.
  • the distance between the magnetic gaps 256a width of the first bridge portion 258) is made wider than in the structure of Comparative Example 1. Thereby, in this embodiment, the strength of the rotor core can be ensured.
  • FIG. 9 is a diagram showing the stress distribution of the rotor core according to the example of the present invention.
  • FIG. 10 is a diagram showing the stress distribution of the rotor core according to Comparative Example 1.
  • FIG. 11 is a diagram showing the stress distribution of the rotor core according to Comparative Example 2.
  • FIG. 9 shows two locations of the magnetic gaps 256b and 263b.
  • a plurality of holes 262 are formed at positions that do not overlap with the d-axis (the center of the magnetic pole). In other words, in this example, the hole 262 is not formed on the d-axis (above the center of the magnetic pole).
  • Comparative Example 1 shown in FIG. 10 a hole 262a is formed on the d-axis (above the center of the magnetic pole). Although the holes 262a are effective in reducing the weight of the rotor core 252, they reduce the strength of the rotor core. Furthermore, in Comparative Example 1, the distance between the magnetic gaps 256a is narrower than in this example. Therefore, the strength of the rotor core 252 is further reduced. Looking at the stress distribution near the magnetic gap 256a, as shown in FIG. 10, in the structure of Comparative Example 1, a location P1 where stress is concentrated occurs.
  • the air hole 262 is not formed on the d-axis (above the center of the magnetic pole), and the distance between the magnetic air gaps 256a is wider than in Comparative Example 1. Therefore, the strength of the rotor core 252 can be increased. As a result, as shown in FIG. 9, in the structure of this embodiment, the stress distribution becomes uniform, and locations where stress is concentrated can be avoided.
  • the magnetic gap 256a (first magnetic gap) is formed by a curve 256a1 extending radially inward from the d-axis end of the radially inner side 254b1 of the second magnet 254b. Therefore, compared to Comparative Example 1, the area of the magnetic gap 256a can be increased and the weight can be reduced.
  • FIG. 11 is a diagram showing Comparative Example 2, which is different from the present example in that a magnetic gap 256a is formed. The other configurations are the same.
  • Comparative Example 2 since the air hole 262a is formed on the d-axis (above the center of the magnetic pole), the strength of the rotor core 252 is reduced, and a location P2 where stress is concentrated occurs in the magnetic air gap 263b. .
  • the strength of the rotor core 252 can be increased.
  • the stress distribution becomes uniform, and locations where stress is concentrated can be avoided.
  • the mechanical strength of the rotor core can be improved while suppressing a decrease in the maximum torque of the rotating electric machine.
  • the present invention is not limited to the above-described embodiments, and includes various modifications.
  • the embodiments described above are described in detail to explain the present invention in an easy-to-understand manner, and the present invention is not necessarily limited to having all the configurations described.
  • it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment and it is also possible to add the configuration of another embodiment to the configuration of one embodiment.
  • Rotor 252... Rotor core, 254... Magnet, 254a...First magnet, 254b...Second magnet, 255a...First magnet insertion hole, 255b...Second magnet insertion hole, 256a, 256b, 263a, 263b...Magnetic gap, 254b1...Radially inner side, 256a1 ... Curve, 257... Magnetic gap, 258... First bridge part, 259... Second bridge part, 260... Shaft, 262... Hole, 263... Magnet stop part, 300... Rotating electric machine, 600...
  • Power converter 610 ...Power module, 620...Power module, 630...Capacitor module, 642...Connector board, 644...Transmission/reception circuit, 646...Control circuit board, 648...Control circuit, 650...Drive circuit board, 652...Drive circuit, 654...Drive circuit Board, 656... Drive circuit, 660... Current sensor, 662... Current sensor

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Abstract

La présente invention concerne un noyau de rotor 252 dans lequel est formé un trou d'insertion d'aimant dans lequel un aimant est inséré. L'aimant comprend un premier aimant 254a et un second aimant 254b disposé en forme de V sur le côté intérieur du premier aimant 254a dans la direction radiale. Le noyau de rotor 252 comporte : un premier vide magnétique 255a qui fait face à la surface radialement intérieure du second aimant 254b ; une première partie de pont 258 qui est formée sur le centre de pôle magnétique et entre les vides magnétiques 256a (premiers vides magnétiques) ; et un vide magnétique 257 (second vide magnétique) qui est formé, à travers une seconde partie de pont 259, plus loin vers l'extérieur dans la direction radiale que la première partie de pont 258 et plus proche du centre de pôle magnétique du second aimant 254b.
PCT/JP2022/023244 2022-06-09 2022-06-09 Rotor de machine électrodynamique, machine électrodynamique et véhicule électrique équipé d'une machine électrodynamique WO2023238312A1 (fr)

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PCT/JP2022/023244 WO2023238312A1 (fr) 2022-06-09 2022-06-09 Rotor de machine électrodynamique, machine électrodynamique et véhicule électrique équipé d'une machine électrodynamique

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Citations (5)

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JP2010178535A (ja) * 2009-01-30 2010-08-12 Toshiba Industrial Products Manufacturing Corp 永久磁石式回転電機の回転子及びその回転電機
WO2013153917A1 (fr) * 2012-04-10 2013-10-17 本田技研工業株式会社 Rotor pour machine électrique tournante
JP2013219847A (ja) * 2012-04-04 2013-10-24 Honda Motor Co Ltd 回転電機のロータ
JP2018082540A (ja) * 2016-11-15 2018-05-24 トヨタ自動車株式会社 回転電機
JP2020162379A (ja) * 2019-03-28 2020-10-01 ダイキン工業株式会社 電動機およびそれを備えた電動機システム

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010178535A (ja) * 2009-01-30 2010-08-12 Toshiba Industrial Products Manufacturing Corp 永久磁石式回転電機の回転子及びその回転電機
JP2013219847A (ja) * 2012-04-04 2013-10-24 Honda Motor Co Ltd 回転電機のロータ
WO2013153917A1 (fr) * 2012-04-10 2013-10-17 本田技研工業株式会社 Rotor pour machine électrique tournante
JP2018082540A (ja) * 2016-11-15 2018-05-24 トヨタ自動車株式会社 回転電機
JP2020162379A (ja) * 2019-03-28 2020-10-01 ダイキン工業株式会社 電動機およびそれを備えた電動機システム

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