WO2019220798A1 - Machine électrique tournante - Google Patents

Machine électrique tournante Download PDF

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Publication number
WO2019220798A1
WO2019220798A1 PCT/JP2019/014778 JP2019014778W WO2019220798A1 WO 2019220798 A1 WO2019220798 A1 WO 2019220798A1 JP 2019014778 W JP2019014778 W JP 2019014778W WO 2019220798 A1 WO2019220798 A1 WO 2019220798A1
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Prior art keywords
axis
rotating electrical
electrical machine
rotor
machine according
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PCT/JP2019/014778
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English (en)
Japanese (ja)
Inventor
道成 福岡
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株式会社デンソー
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Publication of WO2019220798A1 publication Critical patent/WO2019220798A1/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
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
    • H02P21/24—Vector control not involving the use of rotor position or rotor speed sensors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
    • H02P25/022—Synchronous motors

Definitions

  • the present invention relates to a rotating electrical machine.
  • Japanese Patent Application Laid-Open No. 2010-011611 discloses a permanent magnet type rotating electrical machine including a stator having an armature winding and a stator core, and a plurality of permanent magnets and a rotor having a rotor core. ing.
  • a first conductor that extends in the axial direction of the rotor and is disposed at two or more locations in the circumferential direction of the rotating shaft, and a second conductor that electrically connects the first conductors are provided.
  • a single or a plurality of conducting circuits configured to surround the plurality of permanent magnets.
  • the first conductors arranged at two or more locations are composed of two or more types of conductors having different resistance values, and induced currents of different sizes flow according to the rotation angle of the rotor, and the rotation angle of the rotor Since the inductance changes according to the rotation of the rotor, the position of the rotor can be detected and the rotation of the rotor can be controlled without a sensor for detecting the rotation angle of the rotor.
  • the present invention has been made in view of the above-described problems, and can be realized as the following forms.
  • a rotating electrical machine includes a stator, an armature winding wound around the stator, a rotor having a plurality of poles, and a rotation of the rotor by controlling a voltage applied to the armature winding.
  • at least one of the plurality of poles is asymmetric in shape or material with respect to the d-axis or the q-axis.
  • at least one of the plurality of poles is asymmetric in shape or material with respect to the d-axis or the q-axis.
  • the salient pole ratio which is the ratio, or the saliency can be increased.
  • the difference between the d-axis current and the q-axis current can be detected even in the magnetic saturation region, and position sensorless control is possible. Further, since no conductor is added to the rotor, no induced current flows through the rotor, and a reduction in the efficiency of the rotating electrical machine can be suppressed.
  • FIG. 1 is an explanatory diagram showing a schematic configuration of a rotating electrical machine
  • FIG. 2 is an explanatory diagram showing a schematic configuration of a rotor and a stator of a rotating electrical machine
  • FIG. 3 is an explanatory diagram showing an enlarged view of one pole of the rotor.
  • FIG. 4 is an explanatory diagram showing an enlarged view of one pole of a rotor of a rotating electrical machine of a comparative example
  • FIG. 5 is a graph showing the relationship between the position of the rotor and the primary component of the U-phase no-load induced voltage
  • FIG. 6 is an explanatory diagram illustrating position estimation based on a disturbance superimposed voltage
  • FIG. 7 is an explanatory diagram showing a relationship between disturbance voltage and current in a comparative example that is a symmetrical rotating electrical machine
  • FIG. 8 is an explanatory diagram showing the relationship between the disturbance voltage and the current in the first embodiment, which is an asymmetric rotating electrical machine
  • FIG. 9 is a graph showing the relationship between the q-axis current and the q-axis magnetic flux
  • FIG. 10 is a graph showing the relationship between the q-axis current and the q-axis inductance
  • FIG. 11 is an explanatory diagram comparing the relationship between the salient pole ratio and the torque during torque / current control (MTPA control) in the rotating electrical machine of the first embodiment and the rotating electrical machine of the comparative example.
  • FIG. MTPA control torque during torque / current control
  • FIG. 12 is an explanatory diagram showing the relationship between the intersection of the magnetization vectors of two magnets and the d-axis
  • FIG. 13 is an explanatory view showing a rotating electrical machine 11 that does not use a permanent magnet.
  • FIG. 14 is an explanatory diagram showing an enlarged view of one pole of FIG.
  • FIG. 15 is an explanatory view showing an axial type rotating electrical machine
  • FIG. 16 is an explanatory diagram showing a part of the axial type rotating electrical machine as viewed from the outer edge toward the center side.
  • FIG. 1 is an explanatory diagram showing a schematic configuration of the rotating electrical machine 10.
  • the rotating electrical machine 10 includes a rotor 20, armature windings 50u, 50v, 50w wound around a stator, a control unit 100, and an inverter 200.
  • the rotor 20 includes a permanent magnet 30.
  • the armature windings 50u, 50v, 50w are star-connected. Detailed configurations of the rotor 20 and the armature windings 50u, 50v, 50w will be described later.
  • the inverter 200 receives the drive signals gup, gun, gvp, gvn, gwp, and gwn from the control unit 100 and generates voltages Vu, Vv, and Vw to be applied to the armature windings 50u, 50v, and 50w.
  • the inverter 200 corresponds to the DC power supply DC, the switching elements Sup, Svp, Swp on the power supply side, the switching elements Sun, Svn, Swn on the ground side, and the switching elements Sup, Svp, Swp, Sun, Svn, Swn.
  • the switching elements Sup, Svp, Swp, Sun, Svn, and Swn are composed of transistors such as IGBTs, for example.
  • Drive signals gup, gvp, gwp, gun, gvn, and gwn are input to the switching elements Sup, Svp, Swp, Sun, Svn, and Swn, respectively.
  • the switching element Sup and the switching element Sun are connected in series, and the intermediate node Nu is connected to the side opposite to the neutral point M of the armature winding 50u. Note that the switching element Sup and the switching element Sun are not turned on at the same time, and at least one of them is turned off.
  • the switching element Svp and the switching element Svn are also connected in series, and the intermediate node Nv is connected to the side opposite to the neutral point M of the armature winding 50v. Similarly, the switching element Svp and the switching element Svn are not turned on at the same time, and at least one of them is turned off.
  • the switching element Swp and the switching element Swn are also connected in series, and the intermediate node Nw is connected to the side opposite to the neutral point M of the armature winding 50w. Similarly, the switching element Swp and the switching element Swn are not turned on at the same time, and at least one of them is turned off.
  • an ammeter 210 that measures currents Iu, Iv, and Iw flowing through the armature windings 50u, 50v, and 50w, and a voltmeter 220 that measures the voltage of the DC power supply DC.
  • the control unit 100 includes an ⁇ current conversion unit 110, a dq conversion unit 120, a command current setting unit 130, a current control unit 140, an ⁇ voltage conversion unit 150, a three-phase conversion unit 160, and a PWM signal generation unit 170. And an angle estimation unit 180.
  • the ⁇ current conversion unit 110 converts the currents Iu, Iv, and Iw into ⁇ and ⁇ in the fixed coordinate system with the axes of ⁇ and ⁇ , respectively.
  • the positive direction of the ⁇ axis coincides with the U phase
  • the ⁇ axis is a direction advanced by “ ⁇ / 2” with respect to the ⁇ axis.
  • the dq converter 120 converts the currents I ⁇ and I ⁇ into a d-axis current Id and a q-axis current Iq based on the phase ⁇ of the real magnetic pole of the rotating electrical machine 10.
  • the command current setting unit 130 generates a d-axis current command value Idr and a q-axis current command value Iqr based on the required torque Tr required for the rotating electrical machine 10.
  • the required torque Tr is calculated using the vehicle speed and the accelerator pedal stroke.
  • the current control unit 140 calculates the d-axis command voltage Vdr and the q-axis command voltage Vqr using the difference between the d-axis current command value Idr and the d-axis current Id and the difference between the q-axis current command value Iqr and the q-axis current.
  • the current of the rotating electrical machine 10 is controlled by calculating.
  • the ⁇ voltage conversion unit 150 converts the command voltages Vdr and Vqr into a command voltage V ⁇ r on the ⁇ axis and a command voltage V ⁇ r on the ⁇ axis based on the phase ⁇ of the real magnetic pole of the rotating electrical machine 10.
  • the three-phase conversion unit 160 converts the command voltage V ⁇ r on the ⁇ axis and the command voltage V ⁇ r on the ⁇ axis into command voltages Vur, Vvr, and Vwr for each phase.
  • PWM signal generation unit 170 generates drive signals gup, gvp, gwp, gun, gvn, and gwn for driving inverter 200 using command voltages Vur, Vvr, and Vwr of each phase.
  • the angle estimation unit 180 estimates the phase ⁇ of the actual magnetic pole of the rotating electrical machine 10 using, for example, a disturbance superimposed voltage or an extended induced voltage method. This point will be described later.
  • FIG. 2 is an explanatory diagram showing a schematic configuration of the rotor 20 and the stator 40 of the rotating electrical machine 10.
  • FIG. 3 is an explanatory diagram showing an enlarged view of one pole of the rotor 20.
  • the rotor 20 includes a hollow portion 22 and a permanent magnet 30.
  • the hollow portion 22 is a portion where a hole of a member constituting the rotor 20 is opened and means a portion filled with air that is a paramagnetic material.
  • the permanent magnet 30 is fitted into a part of the cavity 22.
  • the stator 40 includes a protruding portion 42 protruding toward the rotor 20 and armature windings 50u, 50v, 50w (FIG. 1) wound around the protruding portion 42.
  • FIG. 2 for convenience of illustration, the armature winding 50 u of one protrusion 42 is illustrated, and the armature windings 50 u, 50 v, 50 w wound around the other protrusion 42 are omitted.
  • the rotor 20 includes two permanent magnets 30 on one pole.
  • the magnetization vectors Bm of the two permanent magnets 30 intersect at a position other than on the d axis. Furthermore, the intersection P where the magnetization vectors Bm of the two permanent magnets 30 are located on the rotational direction side of the rotor with respect to the d-axis. Therefore, the rotating electrical machine 10 of the first embodiment is an asymmetric rotating electrical machine (also referred to as “asymmetric motor”).
  • FIG. 4 is an explanatory diagram showing an enlarged view of one pole of a rotor of a rotating electrical machine of a comparative example.
  • the cavity 23 is symmetrical with respect to the d axis, and has a cavity ratio on the rotation direction side (forward rotation side (+ q axis side)) with respect to the d axis and on the opposite side (reverse rotation side) with respect to the d axis.
  • the cavity ratio of ( ⁇ q axis side) is the same.
  • the rotating electrical machine of the comparative example the point that the rotor 20 includes two permanent magnets 30 in one pole is common, but in the rotating electrical machine of the comparative example, the magnetization vector Bm of the two permanent magnets 30 is on the d axis. Crossed. Therefore, the rotating electrical machine of the comparative example is a symmetric rotating electrical machine (also referred to as “symmetrical motor”).
  • FIG. 5 is a graph showing the relationship between the rotor position and the primary component of the U-phase no-load induced voltage.
  • the d axis and the q axis are defined as follows. When an arbitrary d-axis current is given and the q-axis current is zero, the phase at which the d-axis magnetic flux linked to the stator 40 becomes zero is defined as the d-axis. The axis moved in the rotation direction by / 2 is defined as the q axis.
  • the primary component of the U-phase no-load induced voltage in the first embodiment is that the position of the rotor 20 is advanced by ⁇ ⁇ as compared with the comparative example. ⁇ ⁇ is the difference between the phase ⁇ of the real magnetic pole in the first embodiment and the phase of the real magnetic pole in the comparative example.
  • FIG. 6 is an explanatory diagram for explaining the estimation of the phase ⁇ of the actual magnetic pole by the disturbance superimposed voltage.
  • a voltage obtained by superimposing a disturbance voltage having a frequency higher than the frequency of the drive voltage on the drive voltage of the armature windings 50u, 50v, and 50w is applied to the armature windings 50u, 50v, and 50w of the rotating electrical machine 10 to generate a disturbance current. taking measurement.
  • the inductance changes depending on the position of the rotor 20, and the disturbance current also changes.
  • the angle estimation unit 180 (FIG. 1) estimates the phase ⁇ of the actual magnetic pole by analyzing the fluctuation of the disturbance current using an estimation algorithm.
  • FIG. 7 is an explanatory diagram showing the relationship between the disturbance voltage and the current in a comparative example which is a symmetric rotating electric machine.
  • FIG. 8 is an explanatory diagram showing the relationship between the disturbance voltage and the current in the first embodiment which is an asymmetric rotating electric machine. The amount of change in current when a disturbance voltage is applied is greater in the rotating electrical machine 10 of the first embodiment, which is an asymmetric rotating electrical machine, than in the comparative rotating electrical machine that is a symmetric rotating electrical machine.
  • FIG. 9 is a graph showing the relationship between the q-axis current and the q-axis magnetic flux.
  • the horizontal axis is the q-axis current
  • the vertical axis is the q-axis magnetic flux.
  • the rotating electrical machine of the comparative example that is a symmetric motor
  • the q-axis magnetic flux is also zero.
  • the rotating electrical machine 10 of the first embodiment when the q-axis current is zero, the q-axis magnetic flux has a negative value.
  • FIG. 10 is a graph showing the relationship between the q-axis current and the q-axis inductance.
  • the horizontal axis is the q-axis current
  • the vertical axis is the q-axis inductance.
  • the q-axis inductance of the rotating electrical machine 10 of the first embodiment is larger than the q-axis inductance of the rotating electrical machine (symmetrical) of the comparative example in a region where the q-axis current is positive. That is, in the rotary electric machine 10 of the first embodiment, since the rotor 20 is asymmetric, the d-axis current interferes in the negative direction of the q-axis magnetic path as shown in FIG. As a result, the magnetic saturation of the q-axis magnetic path is relaxed, and the q-axis inductance Lq is improved in the vicinity of the magnetic saturation region.
  • the asymmetric rotating electric machine has a larger q-axis inductance Lq than the symmetric rotating electric machine. Therefore, even in a case where a change in current is not observed due to magnetic saturation in a symmetric rotating electric machine, the influence of magnetic saturation can be reduced in an asymmetric rotating electric machine.
  • the position sensorless control means a control that estimates and drives the rotational speed, magnetic pole position, and the like necessary for the control without attaching a sensor for detecting the rotation of the rotating electrical machine.
  • Position sensorless control detects the magnetic pole position of the rotor (field) using the induced electromotive force generated by the rotation of the rotating electrical machine, and controls the polarity and amplitude of the stator (armature) current accordingly. .
  • FIG. 11 is an explanatory diagram comparing the relationship between the salient pole ratio and the torque during maximum torque / current control (MTPA control) in the rotating electrical machine 10 of the first embodiment and the rotating electrical machine of the comparative example.
  • the torque during MTPA control of the rotating electrical machine 10 of the first embodiment is larger than the torque in the rotating electrical machine of the comparative example in the region where the salient pole ratio (Lq / Ld) is 1.0 to 1.3. Therefore, at the time of MTPA control, even if the load torque is large and the rotating electrical machine of the comparative example cannot start, the rotating electrical machine 10 of the first embodiment can start.
  • FIG. 12 is an explanatory diagram showing the relationship between the intersection of the magnetization vectors of two magnets and the d-axis.
  • the intersection P of the magnetization vectors of the permanent magnet 30 is positioned on the rotation direction side of the rotor 20 with respect to the d axis.
  • the d-axis position of the first embodiment can be moved to the rotational direction side of the rotor 20 relative to the d-axis position of the comparative example.
  • the q-axis magnetic flux can easily flow in the negative direction due to the d-axis current, and the q-axis inductance can be increased and the salient pole ratio can be increased.
  • the permanent magnet 30 is arranged asymmetrically with respect to the d-axis or the q-axis, so that the salient pole ratio (Lq / Ld) is increased. it can.
  • the difference between the d-axis current and the q-axis current can be detected even in the magnetic saturation region, and position sensorless control is possible.
  • no conductor is added to the rotor 20, it is possible to suppress a reduction in efficiency of the rotating electrical machine 10 due to an induced current flowing through the rotor 20.
  • the intersection P of the magnetization vectors of the magnets of the two rotors 20 is located on the rotation direction side of the rotor 20 with respect to the d-axis, the negative q is caused by the d-axis current.
  • the axial magnetic flux can easily flow, and the q-axis inductance can be increased to increase the salient pole ratio.
  • the arrangement of the permanent magnets 30 makes the shape or material of the one pole of the rotor 20 asymmetric with respect to the d-axis or q-axis, but even if the permanent magnet 30 is not used.
  • the shape or material of the rotor 20 can be asymmetric with respect to the d-axis or the q-axis.
  • FIG. 13 is an explanatory diagram showing a rotating electrical machine 11 that does not use a permanent magnet.
  • the rotating electrical machine 11 of the second embodiment is different from the rotating electrical machine 10 of the first embodiment shown in FIG. 2 in that it does not include the permanent magnet 30 and the hollow portion 22 is asymmetric with respect to the d-axis.
  • the cavity ratio of the cavity portion 22 is different on the left and right sides of the d-axis. That is, in the second embodiment, the cavity ratio on the rotation direction side with respect to the d-axis (the cavity ratio on the forward rotation side is smaller than the cavity ratio on the opposite side to the rotation direction with respect to the d-axis. This is the ratio of the size of the hollow portion 22 to the size of the rotor 20. Note that illustration of all the armature windings 50u, 50v, 50w is omitted in FIG.
  • FIG. 14 is an explanatory diagram showing one pole of FIG. 13 in an enlarged manner.
  • the ratio (cavity ratio) at which the cavity 22 is closed on the rotation direction side (counterclockwise side in FIG. 14) from the d-axis is about 26%, and the side opposite to the rotation direction (in FIG.
  • the cavity ratio on the clockwise side) is about 43%, and the difference is about 17%.
  • a negative q-axis magnetic flux can easily flow due to the d-axis current, thereby improving the q-axis inductance in the magnetic saturation region and the d-axis voltage.
  • the q-axis current can be increased when is applied.
  • the difference in the void ratio is, for example, preferably 5 to 25%, and more preferably 10 to 20%.
  • FIG. 15 is an explanatory view showing an axial type rotating electrical machine 12.
  • the disc-shaped rotor 20 and the disc-shaped stator 40 are opposed to each other, and the rotor 20 is in the normal direction of the disc shape (z direction in FIG. 15). Rotate around the axis of rotation.
  • FIG. 16 is an explanatory diagram showing a part of the axial type rotating electrical machine 12 as viewed from the outer edge toward the center side.
  • the two permanent magnets 30 are disposed asymmetrically with respect to the d axis, and the cavity 22 is also asymmetric with respect to the d axis.
  • the axial-type rotating electrical machine 12 if one pole is configured to be asymmetric in shape or material with respect to the d-axis or the q-axis, the same principle as that of the radial-type rotating electrical machines 10 and 11 is used.
  • the q-axis inductance in the magnetic saturation region can be improved, and the q-axis current when the d-axis voltage is applied can be increased.
  • the two permanent magnets 30 are arranged asymmetrically with respect to the d axis, but at least one permanent magnet 30 may be arranged asymmetrically with respect to the d axis.
  • the difference in inductance between the d axis and the q axis can be improved by using the magnetic flux of the permanent magnet 30.
  • the point P where the magnetization vectors Bm of the two permanent magnets 30 intersect is positioned on the rotor rotation direction side of the d axis, but the magnetization vectors Bm of the two permanent magnets 30 intersect.
  • the point P may be positioned on the opposite side of the rotation direction of the rotor from the d axis.
  • the difference in inductance between the d-axis and the q-axis can be improved.
  • the member constituting the rotor 20 is missing and the cavity portion 22 that is a region filled with air is provided.
  • the rotor 20 is formed of a magnetic material and the cavity portion 22 is formed in the cavity portion 22.
  • the corresponding region may be formed of a nonmagnetic material other than air.
  • the difference in inductance between the d-axis and the q-axis can be improved.
  • the void ratio can be obtained by the ratio of the volume of the non-magnetic material to the volume of the magnetic material.
  • a ferromagnetic material such as iron oxide, chromium oxide, cobalt, and ferrite can be used as the magnetic material.
  • non-magnetic material a non-ferromagnetic material such as a diamagnetic material such as bismuth or carbon, a paramagnetic material such as tungsten or aluminum, or an antiferromagnetic material such as manganese oxide or nickel oxide can be used.
  • a non-ferromagnetic material such as a diamagnetic material such as bismuth or carbon, a paramagnetic material such as tungsten or aluminum, or an antiferromagnetic material such as manganese oxide or nickel oxide can be used.
  • the cavity ratio (about 26%) in the rotation direction area of the rotor 20 was smaller than the cavity ratio (about 43%) in the area opposite to the rotation direction of the rotor 20,
  • the void ratio of the region in the rotation direction of the rotor 20 may be larger than the void ratio of the region on the opposite side to the rotation direction of the rotor 20.
  • the difference in inductance between the d-axis and the q-axis can be improved.
  • Modification 6 In each of the above embodiments, the inductance difference between the d-axis and the q-axis is improved by making the position of the permanent magnet 30 and the hollow portion 22 asymmetric with respect to the d-axis.
  • the magnetic flux density B50 of the two regions divided by the d-axis or q-axis at the pole may be different by 5% or more.
  • the difference in inductance between the d-axis and the q-axis can be improved.
  • Modification 7 In the first embodiment, the two permanent magnets 30 are asymmetric with respect to the d-axis, but the magnetomotive force of the permanent magnets in the two regions divided by the d-axis or q-axis at each pole of the rotor 20 is 5 % Or more. Similarly, the difference in inductance between the d-axis and the q-axis can be improved.
  • the present invention is not limited to the above-described embodiment, and can be realized with various configurations without departing from the spirit of the present invention.
  • the technical features of the embodiments corresponding to the technical features in each embodiment described in the summary section of the invention are intended to solve part or all of the above-described problems, or part of the above-described effects. Or, in order to achieve the whole, it is possible to replace or combine as appropriate. Further, if the technical feature is not described as essential in the present specification, it can be deleted as appropriate.
  • a part of the configuration realized by hardware in the above embodiment can be realized by software.
  • at least a part of the configuration realized by software can be realized by a discrete circuit configuration.
  • the present invention can also be realized as the following forms.
  • a rotating electrical machine 10
  • the rotating electric machine includes a stator (40), an armature winding (50u, 50v, 50w) wound around the stator, a rotor (20) having a plurality of poles, and the armature winding.
  • the shape or material is asymmetric.
  • at least one of the plurality of poles is asymmetric in shape or material with respect to the d-axis or the q-axis.
  • the salient pole ratio which is the ratio, or the saliency can be increased.
  • the difference between the d-axis current and the q-axis current can be detected even in the magnetic saturation region, and position sensorless control is possible.
  • no conductor is added to the rotor, no induced current flows through the rotor, and a reduction in the efficiency of the rotating electrical machine can be suppressed.
  • the control unit estimates the position of the rotor by using the difference in inductance between the d-axis and the q-axis, and positions the voltage applied to the armature winding. Sensorless control may be performed. According to this embodiment, the position of the rotor can be estimated using the difference in inductance between the d-axis and the q-axis.
  • control unit may perform position sensorless control using a disturbance superimposed voltage. According to this aspect, the control unit can easily estimate the position of the rotor by using the disturbance superimposed voltage.
  • control unit may perform position sensorless control using an extended induced voltage method. According to this aspect, the control unit can easily estimate the position of the rotor by using the extended induced voltage method.
  • each pole of the rotor may have at least one permanent magnet (30).
  • the difference in inductance between the d-axis and the q-axis can be improved using the magnetic flux of the permanent magnet.
  • each pole of the rotor may have two or more permanent magnets, and magnetization vectors (Bm) of the two or more permanent magnets may intersect.
  • Bm magnetization vectors of the two permanent magnets
  • the magnetization vectors of the two or more permanent magnets may intersect at a position other than on the d-axis.
  • the difference in inductance between the d-axis and the q-axis can be improved by causing the magnetization vectors of the two permanent magnets to intersect at a position other than on the d-axis.
  • the intersection (P) where the magnetization vectors of the two or more permanent magnets intersect may be located on the rotational direction side of the rotor from the d axis. According to this embodiment, since the point where the magnetization vectors of two or more permanent magnets intersect is positioned on the rotor rotation direction side of the d axis, the difference in inductance between the d axis and the q axis can be improved. .
  • a cavity ratio that is a ratio of a magnetic material to a non-magnetic material is a predetermined value. These may be different.
  • the void ratio which is the ratio between the magnetic material and the non-magnetic material, differs by a predetermined value or more, so the d-axis and the q-axis And the difference in inductance can be improved.
  • the cavity ratio in the rotation direction area of the rotor may be smaller than the cavity ratio in the area opposite to the rotation direction of the rotor.
  • the cavity ratio in the region in the rotation direction of the rotor is smaller than the cavity ratio in the region opposite to the rotation direction of the rotor, so that the difference in inductance between the d axis and the q axis is improved. it can.
  • the magnetic flux density B50 in two regions divided by the d-axis or q-axis at each pole of the rotor may be different by 5% or more.
  • the magnetic flux density B50 of the two regions divided by the d-axis or q-axis at each pole of the rotor differs by 5% or more, so that the inductance difference between the d-axis and the q-axis Can be improved.
  • the magnetomotive force of the magnets in the two regions divided by the d-axis or q-axis at each pole of the rotor may be different by 5% or more.
  • the magnetomotive force of the magnets in the two regions divided by the d-axis or q-axis is different by 5% or more at each pole of the rotor, so that the inductance difference between the d-axis and the q-axis Can be improved.
  • the present invention can be realized in various forms.
  • the present invention in addition to a rotating electrical machine, the present invention can be realized by a rotor structure in the rotating electrical machine and a method for controlling the rotating electrical machine.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Control Of Ac Motors In General (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

L'invention concerne une machine électrique tournante (10) pourvue : d'un stator (40) ; d'enroulements d'induit (50u, 50v, 50w) enroulés autour du stator ; d'un rotor (20) ayant une pluralité de pôles ; et d'une unité de commande (100) qui commande la rotation du rotor en commandant les tensions appliquées aux enroulements d'induit. Dans le rotor, au moins un pôle parmi la pluralité de pôles adopte une configuration dans laquelle la forme ou le matériau est asymétrique par rapport à un axe d ou à un axe q, et le rapport de pôle saillant, qui est le rapport entre l'inductance d'axe q et l'inductance d'axe d, est grand.
PCT/JP2019/014778 2018-05-16 2019-04-03 Machine électrique tournante WO2019220798A1 (fr)

Applications Claiming Priority (2)

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JP2018-094426 2018-05-16
JP2018094426A JP6958478B2 (ja) 2018-05-16 2018-05-16 回転電機

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WO2019220798A1 true WO2019220798A1 (fr) 2019-11-21

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