JP5299416B2 - Multi-rotor motor - Google Patents

Description

  The present invention relates to an electric motor, and more particularly to a multiple rotor electric motor having a plurality of rotors.

  In hybrid vehicles, an engine and an electric motor are mounted as driving sources, and driving by the engine can be assisted by the electric motor or can be driven by the electric motor alone. A three-phase AC motor is used as the electric motor, and the running speed is generally variably controlled by energization control with an inverter device. As this type of in-vehicle electric motor, a multiple rotor electric motor having a plurality of rotors has been proposed.

  For example, a vehicle transmission disclosed in Patent Document 1 includes a first rotating electrical machine that is connected to an engine and functions as at least a generator, a second rotating electrical machine that is coupled to a wheel shaft and functions as at least an electric motor, The first and second driving means for driving the second rotating electrical machine and a control means are provided, and an object is to generate a larger torque when the vehicle starts from the control means. And 1st Embodiment shown by FIG. 1 of patent document 1 is provided with the 1st and 2nd rotary electric machine by another body, and the aspect to which another inverter is each connected is disclosed. Further, the third embodiment shown in FIG. 8 discloses an aspect of a double rotor structure constituted by the first and second rotating electrical machines. In the third embodiment, a brush is used to extract electric power from a first rotor that is connected to an engine and wound with a three-phase winding. In each aspect of patent document 1, it is supposed that a big creep torque can be generated when the vehicle starts.

  The electric continuously variable transmission of Patent Document 2 includes a main motor having a double rotor structure, a sub motor that adjusts the torque of the output shaft, and a main and sub inverter. The main motor includes a first rotor that is directly connected to the engine and rotates, and a second rotor that drives the axle. It is described that the first rotor is provided with a three-phase winding and current is supplied from an inverter, and it is estimated that a member corresponding to the brush of Patent Document 1 is provided.

JP-A-2005-47396 Japanese Patent Laid-Open No. 10-42600

  By the way, in 1st Embodiment of patent document 1, since two rotary electric machines (motor unit) are provided with another body, an apparatus enlarges and cost also becomes high. For this reason, a double rotor structure electric motor that integrates two rotating electric machines to reduce the size and cost is disclosed in the third embodiment of Patent Document 1 and Patent Document 2, but rotates. In order to supply power to the windings, a rotating power supply unit such as a brush is provided. Therefore, the effect of downsizing is reduced by the space of the rotary power feeding unit. In addition, maintenance is required for wear and fatigue of the rotating power feeding portion due to use over time, which increases running costs. Further, in Patent Documents 1 and 2, an inverter for power supply is provided in each of the two rotating electric machines, and the manufacturing cost is also increased.

  The present invention has been made in view of the problems of the above-described background art, and by combining a plurality of motor units and driving them with a single power supply unit, high-speed rotation, downsizing, cost reduction, and An object to be solved is to provide a multi-rotor motor that realizes maintenance-free operation.

  The invention of a multi-rotor electric motor according to claim 1 for solving the above-described problem is provided by a stator having a stator winding for forming a stator rotating magnetic field and fixed to a case, and the stator rotating magnetic field. A rotating field part that generates torque by electromagnetic interaction, an induction winding that generates an induced electromotive force by electromagnetic induction action with the stator rotating magnetic field, and the stator rotating magnetic field that is electrically connected to the induction winding Output that generates torque by electromagnetic interaction between the rotor rotating magnetic field and a composite rotor that is rotatably supported by the case and has a rotor winding that forms a rotor rotating magnetic field in the same rotational direction as A rotor having a field part and capable of rotating in the same direction as the composite rotor and at a higher speed than the composite rotor; and coupled to the rotor and rotatably supported by the case or the composite rotor; Output shaft and front Two different alternating current frequencies in the stator winding by weight cumulative, characterized in that it comprises a power supply unit for energizing.

  According to a second aspect of the present invention, in the first aspect, the magnetic flux Φ1 of the first stator rotating magnetic field formed by the first alternating current of the frequency f1 that is supplied to the stator winding by the power source unit, the rotational speed n1, And a torque T1 between the stator winding and the rotating field portion, a magnetic flux Φ2 of a second stator rotating magnetic field formed by a second alternating current having a frequency f2, a rotational speed n2, and the stator winding When the torque T2 between the wire and the rotating field part is the torque Tout between the rotor winding and the output field part, the magnetic flux Φ1 <the magnetic flux Φ2 and the torque T1 <the above The torque T2 and (the torque T2−the torque T1)> the torque Tout, and the rotational speed n1 <the rotational speed n2.

  According to a third aspect of the present invention, in the second aspect, when the rotation direction of the first stator rotating magnetic field and the second stator rotating magnetic field is the same, the rotation speed n1 <the rotation speed n2 and When the rotation direction of the first stator rotating magnetic field and the second stator rotating magnetic field is different, the rotation speed n1 is expressed as a negative value, and 0 <(the absolute value of the rotation speed n1) <(2 × the rotation speed n2). It is characterized by being.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the rotor field and the induction winding have a core of the composite rotor, and the rotor winding has a core. It has a magnetic separation part which magnetically separates them.

  The invention according to claim 5 is the first motor unit configured by the stator winding of the stator and the rotating field portion of the composite rotor according to any one of claims 1-4. The second motor unit composed of the rotor winding of the composite rotor and the output field portion of the rotor has substantially the same output characteristics indicating the relationship between the rotational speed and the torque. Features.

  The invention according to claim 6 is characterized in that, in claim 5, the second motor unit can output up to twice the number of rotations of the first motor unit.

  The invention according to claim 7 is the invention according to any one of claims 1 to 6, wherein the stator winding of the stator, the induction winding and the rotor winding of the composite rotor are all three-phase connections. In addition, the induction winding and the rotor winding are electrically connected by switching two phases.

  The invention according to claim 8 is the invention according to any one of claims 1 to 7, wherein the stator winding of the stator, the induction winding of the composite rotor, and the rotor winding are all the same coil. Further, the arrangement order of the phases in the circumferential direction is the same.

  The invention according to claim 9 is the invention according to claim 8, wherein the induction winding and the rotor winding of the composite rotor are three-phase connected, and three of the induction windings of the composite rotor in the circumferential direction are connected. The position of the phase is coincident with the position of the three phases of the rotor winding.

  The invention according to a tenth aspect is the invention according to any one of the sixth to ninth aspects, wherein each of the phase terminals is configured by performing Y connection or Δ connection in the induction winding and the rotor winding of the composite rotor, respectively. And any two phases of the corresponding phase terminals of the induction winding and the rotor winding are switched and electrically connected.

  The invention according to an eleventh aspect is characterized in that, in any one of the first to sixth aspects, a toroidal coil group is used in place of the induction winding and the rotor winding of the composite rotor.

  In the invention of the multiple rotor type electric motor according to claim 1, the first motor unit is composed of the stator winding of the stator and the rotating field portion of the composite rotor, and the rotor winding and the rotor of the composite rotor. The second motor unit is composed of the output field portion. In the first motor unit, torque is generated by the electromagnetic interaction between the stator winding of the stator and the rotating field portion of the composite rotor, so that the stator rotating magnetic field formed by two alternating currents having different frequencies is generated. The composite rotor rotates in synchronization with one side. Then, in the induction winding on the composite rotor, the synchronized rotating magnetic field does not change, and only the other rotating magnetic field changes including the rotational speed of the composite rotor. As a result, an induced electromotive force is generated in the induction winding, and the rotor winding forms a rotor rotating magnetic field in the same rotation direction as the rotation of the composite rotor by optimizing the electrical connection with the rotor winding. can do. That is, in the second motor unit, it is possible to form a rotor rotating magnetic field that rotates at a higher speed on the rotating composite rotor. Therefore, the rotor and the output shaft that rotate in synchronization with the rotor rotating magnetic field can be rotated at a high speed, and in particular, an output rotational speed larger than the rotational speed derived from the frequency of the power supply unit can be obtained. The number of rotations derived from the frequency of the power supply unit means a synchronization frequency determined by the frequency of the power supply unit in a general electric motor. In the present invention, the larger one of the rotation number n1 and the rotation number n2 of claim 2 And

  In addition, a plurality of motor units are not provided separately, but are combined and integrated. In addition, an induction electromotive force can be generated in a non-contact manner by an induction winding, and a rotating power supply unit such as a brush is unnecessary. The size of the electric motor can be reduced, and the manufacturing cost is reduced. Furthermore, since the power supply unit can be realized by a single inverter device, the manufacturing cost is further reduced. In addition, since the rotating power feeding unit is unnecessary, maintenance-free operation can be realized and the running cost can be reduced.

  In the invention according to claim 2, the composite rotor rotates at the rotational speed n <b> 2 in synchronization with the rotating magnetic field of the second alternating current that generates the large torque T <b> 2 with the large magnetic flux Φ <b> 2 among the first and second alternating currents. Here, since the torque Tout between the rotor winding and the output field part is smaller than (torque T2-torque T1), the rotor and the output shaft are operated at high speed in synchronization with the rotor rotating magnetic field of the composite rotor. When rotating, the rotation of the composite rotor does not fluctuate, and the output rotation speed of the output shaft is stabilized.

  Further, since the rotation speed n1 is smaller than the rotation speed n2, the rotating magnetic field of the magnetic flux Φ1 acts in the reverse rotation direction in the induction winding on the composite rotor. As a result, inductive electromotive force is generated in the induction winding in a phase opposite to that of the power supply unit, and the rotor rotating magnetic field in the same rotational direction as the rotation of the composite rotor is obtained by optimizing the electrical connection with the rotor winding. Can be formed. Therefore, the rotational speed of the rotor and the output shaft can be made higher than the rotational speed n2 of the composite rotor, and an output rotational speed larger than the rotational speeds n1 and n2 derived from the frequency of the power supply unit can be obtained.

  In the invention which concerns on Claim 3, when the rotation direction of a 1st stator rotating magnetic field and a 2nd stator rotating magnetic field differs, the rotation speed n1 is represented by a negative value. This can be realized by controlling the phase orders of the first and second alternating currents having different frequencies to be different from each other. In this case, it is preferable that 0 <(absolute value of the rotational speed n1) <(2 × rotational speed n2), and an output rotational speed 2 to 3 times the rotational speeds n1 and n2 derived from the frequency of the power supply unit is obtained. be able to.

  For example, when the rotational speed n1 is a negative value and approaches 0, the rotational speed Na of the rotating magnetic field of the magnetic flux Φ1 is Na = n1-n2≈ as seen from the induction winding on the composite rotor rotating at the rotational speed n2. -N2. As a result, when the phase sequence of the induced electromotive force generated in the induction winding is reversed and applied to the rotor winding, the rotation speed Na is reversed (changed in sign) and added. That is, the output shaft rotation speed Nout is Nout = n2 + (− Na) ≈2 × n2. This output shaft rotational speed Nout is approximately twice the rotational speed n2 derived from the frequency of the power supply section. Further, for example, when the rotational speed n1 = −n2, the rotational speed Na = n1−n2 = −2 × n2 of the rotating magnetic field of the magnetic flux Φ1 viewed from the induction winding on the composite rotor. Therefore, the output shaft rotational speed Nout = n2 + (− Na) = 3 × n2, which is three times the rotational speed n2 derived from the frequency of the power supply unit. Further, for example, when approaching the rotational speed n1 = −2 × n2, the rotational speed Na = n1−n2≈−3 × n2 of the rotating magnetic field of the magnetic flux Φ1 viewed from the induction winding on the composite rotor is obtained. Therefore, the output shaft rotational speed Nout = n2 + (− Na) ≈4 × n2, which is about twice the absolute value of the rotational speed n1 (≈2 × n2) derived from the frequency of the power supply unit.

  In the invention which concerns on Claim 4, it has a magnetic isolation | separation part which magnetically isolates between the core which the rotating field part and induction winding of a composite rotor have, and the core which a rotor winding has. Therefore, magnetic interference between the two cores in the composite rotor is suppressed, and the first and second motor units operate independently of each other, so that the multi-rotor motor is highly efficient and stable. it can.

  In the invention according to claim 5, the first motor unit composed of the stator winding of the stator and the rotating field portion of the composite rotor, and the rotor winding of the composite rotor and the output field portion of the rotor The output characteristics indicating the relationship between the rotational speed and the torque are substantially the same as those of the second motor unit constituted by Accordingly, the first and second motor units can rationally share the rotational speed in order to obtain a high-speed output rotational speed, and the manufacturing cost is reduced.

  In the invention according to claim 6, the second motor unit can output up to twice the number of rotations of the first motor unit. Therefore, it is possible to realize an output rotational speed that is three times the rotational speed derived from the frequency of the power supply unit, which is the upper limit in the present invention.

  In the invention according to claim 7, the stator winding of the stator, the induction winding and the rotor winding of the composite rotor are respectively connected in three phases, and the induction winding and the rotor winding are two The phases are switched and electrically connected. The present invention can be configured using three-phase windings, and can be applied to the technology of a conventional three-phase AC motor or a three-phase inverter device as a power supply unit. Therefore, the operation of the multi-rotor motor is stable and economical. Also, the electrical connection can be easily optimized by switching two phases between the induction winding and the rotor winding.

  In the invention according to claim 8, the stator winding of the stator, the induction winding and the rotor winding of the composite rotor are all configured in the same coil configuration, and the arrangement order of the phases in the circumferential direction is also the same. Furthermore, in the invention according to claim 9, the induction winding and the rotor winding of the composite rotor are three-phase connected, and the three-phase position of the induction winding of the composite rotor in the circumferential direction and the rotor winding The position of the three phases is the same. As a result, the coil configuration of the stator winding, the induction winding, and the rotor winding and the connection method between the coils are unified so that the manufacturing work can be easily performed and the manufacturing cost can be reduced.

  In the invention according to claim 10, each phase terminal is configured by performing Y connection or Δ connection in the induction winding and the rotor winding of the composite rotor, and the induction winding and the rotor winding correspond to each other. Two phases of each phase terminal are switched and electrically connected. Thereby, electrical connection can be easily optimized and high-speed output rotation speed can be obtained.

  In the invention according to claim 11, a toroidal coil group is used in place of the induction winding and the rotor winding of the composite rotor. Each toroidal coil constituting the toroidal coil group can generate an induced electromotive force by an electromagnetic induction effect linked to the stator rotating magnetic field, and a current flows through the induced electromotive force to form a rotor rotating magnetic field. That is, each toroidal coil can also serve as an induction winding and a rotor winding, and the same effect as in claims 1 to 6 is produced. Furthermore, since the holding strength with which the coil is held by the core is improved, it is easy to secure the anti-centrifugal strength of the coil, and the manufacturing cost can be reduced.

It is sectional drawing which illustrates notionally the structure of the multiple rotor type | mold electric motor of 1st Embodiment. FIG. 3 is an axial direction view showing a configuration of a stator, a composite rotor, and an electrical angle of 360 ° of the rotor in a straight line. It is a figure explaining the connection method and electrical connection of a stator winding, an induction winding, and a rotor winding. It is a figure which illustrates and illustrates the coil structure for the electrical angle of 360 ° of the stator winding, the induction winding, and the rotor winding when the stator side is viewed from the rotor side. It is a table | surface figure explaining the rotation speed increase rate and output characteristic which are obtained when the 1st and 2nd alternating current is supplied to a stator winding in piles. FIG. 6 is a graph showing the rotational speed increase rate obtained in FIG. 5. It is a table | surface figure explaining the rotation speed increase rate when the number of pole pairs of a stator winding and a rotor winding differs. FIG. 9 is an axial view seen from a linear development of a configuration of an electrical angle of 360 ° of a stator, a composite rotor, and a rotor of a multi-rotor motor of a second embodiment. (1) is a figure explaining the function of the induction | guidance | derivation winding and rotor winding of 1st Embodiment, (2) is a figure explaining the function of the toroidal coil group of 2nd Embodiment. FIG. 10 is an axial direction view showing a configuration of an electrical angle of 360 ° of a variation of the multi-rotor electric motor of the second embodiment expanded linearly. It is a figure explaining the connection method and electric connection of the stator winding | coil and toroidal coil group in 2nd Embodiment. It is a figure explaining the coil structure for the electrical angle of 360 degrees of a stator coil | winding and toroidal coil group at the time of seeing a stator side from a rotor side. It is a figure explaining the coil structure of the U-V phase toroidal coil in the toroidal coil group at the time of seeing the stator side from the rotor side. It is a figure explaining the coil structure of the VU phase toroidal coil in the toroidal coil group at the time of seeing the stator side from the rotor side. It is a figure explaining the coil structure of the WW phase toroidal coil in the toroidal coil group at the time of seeing the stator side from the rotor side. It is sectional drawing explaining the coaxial internal / external arrangement example of the actual structure of the multiple rotor type | mold electric motor of 1st Embodiment. It is sectional drawing explaining the example of a tandem arrangement | positioning of the actual structure of the multiple rotor type | mold motor from which 1st Embodiment differs in arrangement | positioning of a motor unit.

  A multiple rotor electric motor according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view conceptually illustrating the configuration of a multi-rotor motor 1 of the first embodiment. The multi-rotor motor 1 of the first embodiment has a generally axisymmetric shape centered on the axis AX, and includes a case 2, a stator 3, a composite rotor 4, a rotor 5, an output shaft 6, a power supply unit 7, and the like. It consists of The composite rotor 4 includes a rotating field portion 41, an induction winding 44, a rotor winding 47, and the like. In FIG. 1, only one half of the axis AX is shown for the stator 3 and the composite rotor 4. The stator winding 31 of the stator 3 and the rotating field portion 41 of the composite rotor 4 constitute an outer motor unit, and the rotor winding 47 of the composite rotor 4 and the output field portion 51 of the rotor 5 serve as an inner motor unit. A motor unit is configured. The outer motor unit and the inner motor unit are configured such that output characteristics indicating the relationship between the rotational speed and the torque are substantially the same.

  The stator 3 is fixed to the inner peripheral surface of the case 2. The stator 3 has a substantially cylindrical core 32 formed by laminating electromagnetic steel plates, and a stator winding 31 is wound around a convex tooth formed on the core 32. The stator winding 31 is composed of a plurality of coils for each of the three phases, and is arranged so as to form a stator rotating magnetic field when an alternating current is applied.

  The composite rotor 4 is disposed on the inner diameter side of the stator 3 and is rotatably supported on the case 2 by a bearing portion (not shown). The composite rotor 4 has an outer core 42 formed by laminating electromagnetic steel plates in a substantially cylindrical shape on the outer diameter side, and an induction winding 44 is wound around a convex tooth formed on the outer core 42. ing. The induction winding 44 is composed of a plurality of coils for each of the three phases, and generates an induced electromotive force by an electromagnetic induction action with the stator rotating magnetic field formed by the stator winding 31. In addition, a field magnet is embedded in the outer core 42, and a rotating field portion 41 is formed by alternately arranging N poles and S poles in the circumferential direction. The rotating field portion 41 generates torque by electromagnetic interaction with the stator rotating magnetic field formed by the stator winding 31.

  On the other hand, the composite rotor 4 has an inner core 48 formed by laminating electromagnetic steel plates in a substantially cylindrical shape on the inner diameter side, and the rotor winding 47 is wound around the convex teeth formed on the inner core 48. Is formed. Between the inner core 48 and the outer core 42, a magnetic separation portion 45 that magnetically separates both the cores 48, 42 is provided. The magnetic separation unit 45 can be configured using, for example, a nonmagnetic material. Alternatively, the yoke widths of the inner core 42 and the outer core 48 may be sufficiently widened to suppress mutual magnetic leakage. The magnetic separation unit 45 allows the rotating field unit 41 and the induction winding 44 and the rotor winding 47 to operate independently of each other without magnetic interference.

  The rotor winding 47 is composed of a plurality of coils for each of the three phases, and is electrically connected to the induction winding 44 by connection leads 49. The connection lead 49 is properly wired so that a current flows through the rotor winding 47 due to the induced electromotive force generated in the induction winding 44 and forms a rotor rotating magnetic field in the same rotational direction as the rotation of the composite rotor 4. Has been.

  The rotor 5 is disposed on the inner diameter side of the composite rotor 4. The rotor 5 has a core 52 formed by laminating electromagnetic steel plates in a substantially cylindrical shape. A field magnet is embedded in the core 52, and an output field portion 51 is formed by alternately arranging N poles and S poles in the circumferential direction. The output field portion 51 generates torque by electromagnetic interaction with the rotor rotating magnetic field formed by the rotor winding 47. With this torque, the rotor 5 can rotate in the same direction as the composite rotor 4 and at a higher speed than the composite rotor 4.

  The output shaft 6 is configured to penetrate the axis AX of the rotor 5 and rotate integrally therewith, and is rotatably supported by the case 2 at the bearing portion 21.

  The power supply unit 7 includes a DC power supply device 71, an inverter device 72, an inverter control unit 73, and the like. For example, a battery is used as the DC power supply device 71 and its output terminal is connected to the inverter device 72 to supply a DC voltage. The inverter device 72 can convert direct current into three-phase alternating current, and can apply two three-phase alternating currents having different frequencies to the stator winding 31 in an overlapping manner. The inverter device 72 can switch the phase order of the two three-phase alternating currents independently of the normal phase order and the reverse phase order. The inverter control unit 73 variably controls the frequency, current value, phase, and phase order of the two three-phase alternating currents.

  Next, the configuration of the stator 3, the composite rotor 4, and the rotor 5 will be described in further detail. FIG. 2 is an axial view of the configuration of the stator 3, the composite rotor 4, and the rotor 5 corresponding to an electrical angle of 360 ° developed linearly. In FIG. 2, the upper side is the outer diameter side, the lower side is the inner diameter side, and the left-right direction is an arc-shaped portion corresponding to an electrical angle of 360 ° in the circumferential direction developed linearly. In the first embodiment, the number of pole pairs of the stator winding 31 and the rotor winding 47 is the same, and therefore the electrical angle 360 ° of the outer motor unit and the inner motor unit is the same mechanical angle.

  In FIG. 2, the stator 3 arranged on the outermost diameter side has a core 32 having 12 inwardly convex teeth 321 at an electrical angle of 360 °, and a stator winding 31 of distributed winding. ing. The stator winding 31 is composed of a U-phase winding (solid line in the figure), a V-phase winding (broken line in the figure), and a W-phase winding (one-dot chain line in the figure) in order from the inner diameter side. Each phase winding has two coils in an electrical angle of 360 °. In FIG. 2, the two U-phase coils 31U1 and 31U2 of the U-phase winding are just within an electrical angle of 360 °. The two U-phase coils 31U1 and 31U2 each circulate five teeth 321 and one vacant tooth 321A is disposed therebetween.

  The two V-phase coils 31V1 and 31V2 are arranged on the right side in the drawing by the amount of four teeth 321 from the U-phase, and are wound in the same manner as the U-phase coils 31U1 and 31U2. Further, two W-phase coils 31W1 (the second is not shown) are arranged on the right side of the figure by four teeth 321 rather than the V-phase, and are wound in the same manner as the U-phase coils 31U1 and 31U2. Is formed. That is, the coil configuration is the same for each phase, and the arrangement is shifted by four teeth 321 in the circumferential direction in the order of the U phase, the V phase, and the W phase.

  A composite rotor 4 is disposed on the inner diameter side of the stator 3 via a gap G1. The composite rotor 4 includes an outer core 42 on the outer diameter side having twelve outwardly convex teeth 421 at an electrical angle of 360 °, an inner core 48 on the inner diameter side having twelve inwardly convex teeth, In addition, the magnetic separation portion 45 is disposed between the cores 42 and 48 and has a three-layer structure. The distributed winding induction winding 44 wound around the outer core 42 is arranged symmetrically with respect to the stator winding 31 of the stator 3. That is, in order from the outer diameter side, two U-phase coils 44U1 and 44U2 constituting a U-phase winding (solid line in the figure), two V-phase coils 44V1 constituting a V-phase winding (dashed line in the figure), Two W-phase coils 44W1 (the second is not shown) constituting 44V2 and a W-phase winding (the one-dot chain line in the figure) are arranged. The in-phase coils of the stator winding 31 and the induction winding 44 are arranged symmetrically with the gap G1 interposed therebetween. That is, the stator winding 31 and the induction winding 44 have the same coil configuration, and the arrangement order of the phases in the circumferential direction also matches. In the outer core 42, a pair of field magnets 41 </ b> N and 41 </ b> S is further embedded to form a rotating field portion 41.

  On the other hand, the distributed winding rotor winding 47 wound around the teeth of the inner core 48 is arranged symmetrically with respect to the induction winding 44 of the composite rotor 4. That is, in order from the inner diameter side, two U-phase coils 47U1 and 47U2 constituting a U-phase winding (solid line in the figure), and two V-phase coils 47V1 and 47V2 constituting a V-phase winding (dashed line in the figure). , Two W-phase coils 47W1 (the second is not shown) constituting the W-phase winding (the one-dot chain line in the figure) are arranged. The in-phase coils of the induction winding 44 and the rotor winding 47 are arranged symmetrically with the magnetic separation part 45 in between. That is, the three-phase position of the induction winding 44 of the composite rotor 4 and the three-phase position of the rotor winding 47 in the circumferential direction coincide with each other.

  A rotor 5 is arranged on the inner diameter side of the composite rotor 4 via a gap G2. In the core 52 of the rotor 5, a pair of field magnets 51 </ b> N and 51 </ b> S are embedded to form an output field portion 51.

  Next, the connection method and electrical connection of the stator winding 31, the induction winding 44, and the rotor winding 47 will be described with reference to FIG. As shown in the drawing, the stator winding 31, the induction winding 44, and the rotor winding 47 have neutral points 31N, 44N, and 47N, respectively, and are three-phase Y-connected. U-phase terminal 31 UT, V-phase terminal 31 VT, and W-phase terminal 31 WT of stator winding 31 are electrically connected to inverter device 72 of power supply unit 7. Further, the stator winding 31 and the induction winding 44 are coupled by electromagnetic induction. Between the induction winding 44 and the rotor winding 47, the magnetic separation portion 45 is interposed, so that no electromagnetic induction action occurs, and any two phases are switched by the connection lead 49 and are electrically connected. 3, the U-phase terminal 44UT of the induction winding 44 is electrically connected to the V-phase terminal 47VT of the rotor winding 47, and the V-phase terminal 44VT of the induction winding 44 is the U-phase terminal of the rotor winding 47. It is electrically connected to 47UT, and W-phase terminals 44WT and 47WT are electrically connected to each other.

  FIG. 4 is a diagram illustrating an example of the coil configuration of the stator winding 31, the induction winding 44, and the rotor winding 47 for an electrical angle of 360 °. In the upper stator winding 31 in the figure, a U-phase winding is illustrated. That is, the conductor coming out of the U-phase terminal 31UT circulates the teeth 321 clockwise by a predetermined number of times by the first U-phase coil 31U1, and then turns the teeth 321 over the second U-phase coil 31U2. It shows that the neutral point 31N is reached by rotating counterclockwise a predetermined number of times. The V-phase winding and the W-phase winding of other phases not shown in the figure have the same coil configuration by sequentially shifting four teeth 321 in the circumferential direction.

  Also, the coil configuration of the middle induction winding 44 in the figure is the same as that of the stator winding 31, and two U-phase coils 44U1 and 44U2 of the U-phase winding are illustrated. Furthermore, the coil configuration of the lower rotor winding 47 is the same as that of the stator winding 31, and two V-phase coils 47V1 and 47V2 are illustrated. The connection lead 49 is connected to the U-phase terminal 44 UT of the induction winding 44 and the V-phase of the rotor winding 47 so that the induction winding 44 and the rotor winding 47 are electrically connected by switching the U-phase and the V-phase. The terminal 47VT is electrically connected.

  Next, the operation of the multiple rotor type motor 1 of the first embodiment configured as described above will be described. First, the conditions for energizing two three-phase alternating currents having different frequencies from the inverter device 72 of the power supply unit 7 to the stator winding 31 will be summarized. The frequency, current value, and phase of the two three-phase alternating currents can take independent and independent values, and the phase order can also be changed. Therefore, the magnetic flux Φ1 of the first stator rotating magnetic field formed by the first alternating current having the frequency f1 and the rotation speed n1, and the magnetic flux Φ2 of the second stator rotating magnetic field formed by the second alternating current having the frequency f2 are rotated. When the number n2 is set, generality is not lost even if magnetic flux Φ1 <magnetic flux Φ2. That is, the side where the current value is large and generates a larger magnetic flux is defined as the second alternating current. In addition, when the number of pole pairs of the stator winding 31 is P, the rotation number n2 = f2 / P (rps) of the second stator rotating magnetic field is a positive value. Then, the number of rotations n1 = f1 / P (rps) of the first stator rotating magnetic field can be either positive or negative depending on whether the phase sequence is positive or negative. The phases of the magnetic fluxes Φ1 and Φ2 are optimized so that the composite rotor 4 and the rotor 5 generate a desired torque, respectively.

  FIG. 5 is a table for explaining the rotational speed increase rate K and the output characteristics obtained when the first and second alternating currents are energized through the stator winding 31. The column of the rotational speed condition in the list shows the condition of the magnitude relationship between the positive and negative of the rotational speed n1 and the rotational speed n2. The column of the number of rotations derived from the power supply unit in the list means a synchronous frequency determined by the frequency of the power supply unit in a general electric motor, and the above-described rotation number n1 (absolute value in the case of a negative value) and rotation number n2 The larger side. The column of the rotational speed increase rate K in the list is a rate indicating how many times the output rotational speed Nout obtained by the output shaft 6 is higher than the rotational speed derived from the power supply unit. In other words, the rotational speed increase rate K is an index for evaluating how much high-speed rotation can be achieved compared to a general electric motor including a single stator and a rotor. The column of output characteristics in the list shows the overall output characteristics of the multi-rotor motor 1 in comparison with the characteristics of the single outer motor unit and the single inner motor unit, with the horizontal axis representing the rotational speed and the vertical axis representing the torque. Is.

  Under the condition that the magnetic flux Φ1 <the magnetic flux Φ2 described above and the phase of the magnetic flux Φ2 is optimized so that the composite rotor 4 generates a desired torque under the magnetic flux Φ2, the stator winding 31 has a first phase. When the first and second alternating currents are applied in succession, the first and second stator rotating magnetic fields are generated in the stator winding 31 in a cumulative manner. On the other hand, the rotating field part 41 of the composite rotor 4 synchronizes with the second stator rotating magnetic field that generates a large torque T2 with a large magnetic flux Φ2. That is, the composite rotor 4 rotates at the rotation speed n2. Supplementally, the phase of the magnetic flux Φ 1 is optimized for the rotor 5, and is shifted from the composite rotor 4. For this reason, torque T1 becomes small. In addition, since the rotating magnetic field deviates from the synchronous rotational speed, the torque T1 becomes almost zero when averaged over time. In addition, it is also possible to intentionally adjust the frequency and phase of the first and second alternating currents so that this situation is realized.

  When the composite rotor 4 rotates at the rotational speed n2, the second stator rotating magnetic field synchronized with the induction winding 44 on the composite rotor 4 does not change, and the first stator rotating magnetic field (magnetic flux Φ1) is not changed. , Only the rotational speed n1) includes the rotational speed n2 of the composite rotor 4 and changes with the rotational speed Na. Then, an induced electromotive force having a frequency corresponding to the rotation speed Na is generated in the induction winding 44, a current flows through the rotor winding 47, and a rotor rotating magnetic field is generated.

  Here, since the U phase and the V phase are switched and electrically connected, the rotation speed of the rotor rotating magnetic field on the composite rotor 4 is obtained by inverting the sign of the rotation speed Na. The rotational speed of the rotor rotating magnetic field viewed from the output field unit 51 is a value obtained by inverting the sign of the rotational speed Na to the rotational speed n2 of the composite rotor 4 and adding it. The rotor 5 and the output shaft 6 rotate in synchronization with this rotor rotating magnetic field. Therefore, the output shaft 6 can obtain an output rotational speed Nout obtained by inverting the sign of the rotational speed Na to the rotational speed n2 of the composite rotor 4 and adding it. Here, it should be noted that a large output rotational speed Nout can be obtained when the rotational speed Na is a negative value.

  When obtaining the output rotation speed Nout and the rotation speed increase rate K, the four conditions that consider the magnitude and positive / negative of the rotation speed n1 of the first stator rotating magnetic field are considered separately. In the rotational speed condition a) 0 <n2 ≦ n1 in FIG. 5, the rotational speed Na of the first stator viewed from the induction winding 44 is Na = n1-n2, and the output shaft rotational speed Nout = n2 + (− Na) = 2. Xn2-n1. Further, the rotational speed increase rate K1 = Nout / n1 = (2 × n2 / n1) −1. The rotational speed increase rate K1 is 1 at the maximum (when n1 = n2), and no effect is produced. If the electrical connection between the U phase and the V phase is not switched, the sign of the rotational speed Na is not reversed, but the output shaft rotational speed Nout = n2 + Na = n1, and no effect is produced.

  Rotational speed condition a) When 0 ≦ n1 <n2, the output shaft rotational speed Nout = 2 × n2−n1, and the rotational speed increase rate K2 = Nout / n2 = 2− (n1 / n2). The rotational speed increase rate K2 is 2 at the maximum (when n1 = 0), and a remarkable effect occurs.

  Rotational speed condition c) When n1 <0 <n2 (where n2 ≧ (the absolute value of n1)), the output shaft rotational speed Nout = 2 × n2 + (the absolute value of n1), and the rotational speed increase rate K3 = Nout / n2 = 2 + (absolute value of n1 / n2). The rotational speed increase rate K3 is 3 at the maximum (when n1 = −n2), and a remarkable effect is produced.

  Rotational speed condition d) When n1 <0 <n2 (where n2 <(the absolute value of n1)), the output shaft rotational speed Nout = 2 × n2 + (the absolute value of n1), and the rotational speed increase rate K4 = Nout / ( (the absolute value of n1) = 2 × n2 / (the absolute value of n1) +1. The rotational speed increase rate K4 is 3 at the maximum (when n1 = −n2), and a remarkable effect is produced up to a range where the rotational speed increase rate K4 = 2 at n1 = −2 × n2.

  Note that under the rotational speed conditions (i) to (d), as shown in the output characteristic column of FIG. 5, the output characteristics of the multi-rotor motor 1 are positioned on the higher speed rotation side than the outer motor unit and the inner motor unit alone. doing. That is, the rotational speed increase rate K2 to K4 exceeds 1, and an effect of obtaining a high speed rotational speed is produced.

  FIG. 6 is a graph showing the rotational speed increase rate K (K1 to K4) obtained in FIG. In the figure, the horizontal axis represents the rotational speed n1, and the vertical axis represents the rotational speed increase rate K. As is clear from FIG. 6, when the rotational speed n1 is the reverse rotational direction (negative value) of the rotational speed n2 and the absolute values are equal, the rotational speed increase rate K becomes the maximum value 3. Here, as described above, the outer motor unit and the inner motor unit are configured such that the output characteristics indicating the relationship between the rotational speed and the torque are substantially the same. Therefore, if the first and second alternating currents having substantially the same frequency and current value from the inverter device 72 and having their phase order reversed are applied to the stator winding 31 in succession, the rotational speed increase rate K is 3 and the current value. It is possible to realize the multi-rotor motor 1 that outputs torque according to the above.

  As described above, according to the multi-rotor motor 1 of the first embodiment, high-speed rotation is possible until the rotation speed increase rate K reaches a maximum of 3. In addition, a plurality of motor units are not provided separately, but are combined and integrated, and an induction electromotive force can be generated in a non-contact manner by the induction winding 44, so that a rotating power supply unit such as a brush is unnecessary, so that multiple rotations are possible. The child electric motor 1 can be reduced in size, and the manufacturing cost is reduced. Furthermore, since the power supply unit 7 can be realized by a single inverter device 72, the manufacturing cost is further reduced. In addition, since the rotating power feeding unit is unnecessary, maintenance-free operation can be realized and the running cost can be reduced.

  Further, the stator winding 31 of the stator 3 and the induction winding 44 of the composite rotor 4 have the same coil configuration and are arranged so that the arrangement order of the phases in the circumferential direction also coincides. Further, the three-phase position of the induction winding 44 of the composite rotor 4 and the three-phase position of the rotor winding 47 in the circumferential direction coincide with each other. As a result, the coil configuration of each of the windings 31, 44 and 47 and the connection method between the coils are unified, making it easy to understand and making the manufacturing work easy, and reducing the manufacturing cost. In addition, since any two phases of the corresponding phase terminals of the induction winding 44 and the rotor winding 47 are switched and electrically connected, the electrical connection can be easily optimized.

  In the first embodiment, the number of pole pairs of the stator winding 31 and the rotor winding 47 is the same, but may be different values. However, the configuration of each winding shown in FIG. 2 changes. The general rotational speed increase rate K in this case can be obtained from FIG. FIG. 7 is a table illustrating the rotational speed increase rate K when the number of pole pairs of the stator winding and the rotor winding is different. In the calculation formula in the figure, the number of pole pairs P2 of the stator windings and the number of pole pairs P1 of the rotor windings. As in the case of FIG. 5 where the number of pole pairs is the same, the rotation speed condition o) 0 <n2 ≦ n1 has no effect, and the rotation speed condition f) 0 ≦ n1 <n2, g) n1 <0 <n2 (however, , N2 ≧ (the absolute value of n1)), and h) n1 <0 <n2 (where n2 <(the absolute value of n1)).

  Next, the multi-rotor motor 10 of the second embodiment will be described. The multi-rotor motor 10 of the second embodiment is configured by replacing the induction winding 44 and the rotor winding 47 of the composite rotor 4 of the first embodiment with a toroidal coil group 8, and the other parts are the first. This is the same as the embodiment. FIG. 8 is an axial direction view showing the configuration of the stator 3, the composite rotor 40, and the rotor 5 for the electrical angle of 360 ° of the multi-rotor motor 10 of the second embodiment in a straight line. is there. In FIG. 8, the upper side is the outer diameter side, the lower side is the inner diameter side, and the left-right direction is a linear development of the arc-shaped portion corresponding to the electrical angle of 360 ° in the circumferential direction. The toroidal coil group 8 is composed of 12 toroidal coils in the range of an electrical angle of 360 °, which will be described in detail below.

  As can be seen by comparing FIG. 8 with FIG. 2, in the second embodiment, the two U-phase coils 44U1 and 44U2 constituting the induction winding 44 and the two V-phase coils 47V1 and 47V2 constituting the rotor winding 47 are provided. Instead, four U-V phase toroidal coils 81 to 84 are provided. Similarly, instead of the two V-phase coils 44V1 and 44V2 constituting the induction winding 44 and the two U-phase coils 47U1 and 47U2 constituting the rotor winding 47, four V-U phase toroidal coils 85 are provided. To 87 (the fourth is not shown). Further, instead of the two W-phase coils 44W1 (the second is not shown) constituting the induction winding 44 and the two W-phase coils 47W1 (the second is not shown) constituting the rotor winding 47, Four WW-phase toroidal coils 88 and 89 (the third and fourth are not shown) are provided.

  Each of the toroidal coils 81 to 89 is wound over the magnetic separation portion 45 so as to interlink with both the outer core 42 and the inner core 48 of the composite rotor 40. The first U-V phase toroidal coil 81 includes one tooth 422 of the outer core 42 around which the first U-phase coil 44U1 of the induction winding 44 is wound, and the first winding of the rotor winding 47. Winding is formed between one tooth 482 of the inner core 48 around which the V-phase coil 47V1 is wound. The second U-V phase toroidal coil 82 includes the other teeth 423 of the outer core 42 around which the first U phase coil 44U1 of the induction winding 44 is wound, and the first winding of the rotor winding 47. Winding is formed between the other teeth 483 of the inner core 48 around which the V-phase coil 47V1 is wound.

  Third and fourth U-V phase toroidal coils 83, 84 are respectively between one and the other teeth 424, 425 of outer core 42 around which second U phase coil 44 U 2 of induction winding 44 is wound. The second V-phase coil 47V2 of the rotor winding 47 is wound between one and the other teeth 484 of the inner core 48 (the second is not shown). After all, each of the U-V phase toroidal coils 81 to 84 is formed so as to shift to the right in the drawing by 4 teeth in the circumferential direction in the inner core 48 rather than the outer core 42.

  Similarly, the four V-U phase toroidal coils 85 to 87 (the fourth is not shown) are between the teeth 426, 427, and 428 (the fourth is not shown) of the outer core 42 and the inner core 48, respectively. Between the teeth 486, 487, and 488 (the fourth is not shown), the inner core 48 is wound around the inner core 48 so as to shift to the left in the figure by the amount of four teeth. . Also, the four W-W phase toroidal coils 88 and 89 (third and fourth are not shown) are respectively between teeth 429 and 42A of the outer core 42 (the third and fourth are not shown). And between the teeth 489 and 48A (the third and fourth are not shown) of the inner core 48 which is symmetrical inside and outside.

  Next, the function of the toroidal coil group 8 will be described using the first and second U-V phase toroidal coils 81 and 82 as examples. In FIG. 9, (1) is a diagram for explaining the functions of the induction winding 44 and the rotor winding 47 of the first embodiment, and (2) is a diagram for explaining the functions of the toroidal coil group 8 of the second embodiment. is there. In the first embodiment of FIG. 9 (1), consider a case where an alternating current is applied to the U-phase coil 31 U 1 of the stator winding 31 and a magnetic flux φ is generated in each tooth 321 of the core 32 of the stator 3. The magnetic flux φ reaches each tooth 421 of the outer core 42 of the composite rotor 4 beyond the gap G1, interlinks with the U-phase coil 44U1 of the induction winding 44, and branches to magnetic fluxes φY11 and φY12 at the yoke portion. The U-phase coil 44U1 of the induction winding 44 circulates five teeth 421, and an induced electromotive force is generated by interlinking with five magnetic fluxes φ. This induced electromotive force is supplied to the first V-phase coil 47V1 of the rotor winding 47 so that a current flows, a magnetic flux φ2 is formed in each tooth 481 of the inner core 48, and a rotor rotating magnetic field is formed. Further, the magnitude of the rotor rotating magnetic field is proportional to five of the original magnetic flux φ.

  On the other hand, in the second embodiment of FIG. 9B, when the magnetic flux φ is generated in each tooth 321 on the stator 3 side, the magnetic flux φ reaches each tooth 421 of the outer core 42, and the magnetic flux φY11 is generated at the yoke portion. , ΦY12 (φY11 + φY12 = 5φ) is the same point. The first and second U-V phase toroidal coils 81 and 82 are linked to the magnetic flux before or after branching, and an induced electromotive force is generated in each. As a result, current flows through the first and second U-V phase toroidal coils 81 and 82, and magnetic fluxes φY21 and φY22 are generated at the yoke portions of the inner core 48 that are linked to each other. Thereby, magnetic flux φ2 is formed in each tooth 481, and a rotor rotating magnetic field is formed. The magnitude of the rotor rotating magnetic field is proportional to the sum of the magnetic fluxes φY21 and φY22 of the yoke portion, that is, proportional to five of the original magnetic flux φ.

  The above-described functions are substantially the same for the other toroidal coils 83 to 89 constituting the toroidal coil group 8. Therefore, the toroidal coil group 8 of the second embodiment has the same functions as the induction winding 44 and the rotor winding 47 of the first embodiment in that a rotor rotating magnetic field is formed on the inner core 48.

  Next, a variation of the second embodiment in which the arrangement of the toroidal coil group 8 is modified will be described. In the second embodiment shown in FIG. 8, since the toroidal coils cross each other and overlap each other, the multiple rotor type motor 10 is enlarged in the axial direction. As a countermeasure for this, a variation in which a routing route for winding the toroidal coil group 8 is changed can be considered. FIG. 10 is a view in the axial direction showing the configuration of the variation of the multi-rotor electric motor 10 of the second embodiment for an electrical angle of 360 ° in a straight line. As shown in the drawing, the U-V phase toroidal coils 81 to 84 and the VU phase toroidal coils 85 to 89 are avoided so as to avoid the WW phase toroidal coils 88 and 89 (the third and fourth are not shown). 87 (the fourth is not shown) can be bent and routed. As a result, the crossing of the coils can be eliminated and an increase in size in the axial direction can be avoided.

  Next, the connection method and electrical connection of the stator winding 31 and the toroidal coil group 8 in the second embodiment and its variations will be described with reference to FIG. As shown in the figure, the stator winding 31 is three-phase Y-connected and electrically connected to the inverter device 72 as in the first embodiment. On the other hand, in the toroidal coil group 8, four U-V phase toroidal coils 81 to 84 are sequentially connected in series, and a U-phase terminal 8UT is provided at one end and a U-phase neutral point 8NU is provided at the other end. Similarly, four V-U phase toroidal coils 85 to 87 (the fourth is not shown) are sequentially connected in series, and a V-phase terminal 8VT is provided at one end and a V-phase neutral point 8NV is provided at the other end. In addition, four W-W phase toroidal coils 88 and 89 (the third and fourth are not shown) are sequentially connected in series, and provided with a W-phase terminal 8WT at one end and a W-phase neutral point 8NW at the other end. It is done. And each phase terminal 8UT, 8VT, 8WT of 3 phases is connected, and each phase neutral point 8NU, 8NV, 8NW is connected.

  FIG. 12 is a diagram illustrating a coil configuration for an electrical angle of 360 ° of the stator winding 31 and the toroidal coil group 8 when the stator 3 side is viewed from the rotor 5 side. The coil configuration of the upper stator winding 31 in the figure is the same as that of the first embodiment described in FIG. Since the coil configuration of the toroidal coil group 8 is difficult to see in a complicated manner, it will be described again in FIGS.

  FIG. 13 is a diagram illustrating the coil configuration of the U-V phase toroidal coils 81 to 84 in the toroidal coil group 8 when the stator 3 side is viewed from the rotor 5 side. As shown in the figure, the conductor coming out of the U-phase terminal 8UT circulates counterclockwise a predetermined number of times by the first U-V phase toroidal coil 81 and then crosses the second U-V phase toroidal coil 82. Then, it circulates clockwise a predetermined number of times and passes over the third U-V phase toroidal coil 83. Further, the conductor circulates the third U-V phase toroidal coil 83 clockwise a predetermined number of times, and then circulates counterclockwise a predetermined number of times over the fourth UV phase toroidal coil 84. A phase neutral point of 8 NU is reached.

  FIG. 14 is a diagram for explaining the coil configuration of the V-U phase toroidal coils 85 to 87 in the toroidal coil group 8 when the stator 3 side is viewed from the rotor 5 side. As shown in the drawing, the conductor coming out of the V-phase terminal 8VT circulates counterclockwise a predetermined number of times by the first V-U phase toroidal coil 85, and then crosses the second V-U-phase toroidal coil 86. Then, it circulates clockwise a predetermined number of times and passes to the third VU phase toroidal coil 87. Furthermore, the conductor circulates the third VU-phase toroidal coil 87 clockwise a predetermined number of times, and then circulates counterclockwise a predetermined number of times over the fourth VU-phase toroidal coil. A neutral point of 8 NV is reached.

  FIG. 15 is a diagram illustrating the coil configuration of the WW phase toroidal coils 88 and 89 in the toroidal coil group 8 when the stator 3 side is viewed from the rotor 5 side. As shown in the figure, the conductor coming out of the W-phase terminal 8WT circulates counterclockwise a predetermined number of times by the first WW-phase toroidal coil 88, and then passes to the second WW-phase toroidal coil 89. Then, it circulates clockwise a predetermined number of times and passes over the third WW phase toroidal coil. Further, the conductor circulates the third WW phase toroidal coil clockwise a predetermined number of times, and then circulates counterclockwise a predetermined number of times over the fourth WW phase toroidal coil. The sex point reaches 8NW. In addition, in 2nd Embodiment shown in FIGS. 11-15, the case where the coil in which a winding direction differs is illustrated in the in-phase coil group is illustrated, and the winding direction of a coil is unified and the connection method between coils is changed. It may be dealt with by doing.

  The operation of the multi-rotor motor 10 of the second embodiment configured as described above is the same as that of the first embodiment described with reference to FIGS. Further, in addition to the same effects as those of the first embodiment, since the holding strength is improved by winding the toroidal coils 81 to 89 across the outer core 42 and the inner core 48, the centrifugal strength strength is improved. Securement is facilitated and manufacturing costs can be reduced.

  Next, the actual configuration of the multi-rotor electric motor 1 of the first embodiment described conceptually will be described by way of examples. FIG. 16 is a cross-sectional view illustrating a coaxial inner / outer arrangement example 11 of the actual configuration of the multiple rotor electric motor 1 of the first embodiment. In the coaxial inner / outer arrangement example 11, the outer motor unit and the inner motor unit are arranged on the coaxial outer side and the inner side with the axis AX in common. FIG. 17 is a cross-sectional view for explaining a tandem arrangement example 12 of an actual configuration of a multi-rotor motor having a motor unit arrangement different from that of the first embodiment. In the tandem arrangement example 12, the outer motor unit and the inner motor unit are arranged side by side in the direction of the axis AX with the axis AX as a common.

  In the coaxial inner / outer arrangement example shown in FIG. 16, the stator 3 is fixed to the inner surface of the case 2, and the composite rotor 4 is disposed on the inner diameter side of the stator 3. The composite rotor 4 has a cylindrical intermediate shaft 4M extending on both sides in the axis AX direction. The intermediate shaft 4M is reduced in diameter on both sides in the direction of the axis AX, and a pair of bearing portions 22 and 23 are disposed between the outer peripheral surfaces of the ends 4M2 and 4M3 on both sides of the reduced diameter and the case 2. The intermediate shaft 4M is rotatably supported by the case 2 by the bearing portions 22 and 23.

  A rotor 5 is disposed on the inner diameter side of the composite rotor 4. An output shaft 6 extends through the center of the rotor 5. The output shaft 6 extends on both sides in the axis AX direction, and both end portions 61 and 62 protrude to the outside of the case 2. A pair of bearing portions 24 and 25 are disposed between the outer peripheral surfaces near both end portions 61 and 62 of the output shaft 6 and the inner peripheral surfaces of the end portions 4M2 and 4M3 of the intermediate shaft 4M. The output shaft 6 is rotatably supported by the intermediate shaft 4M by the bearing portions 24 and 25. The power supply unit 7 is omitted in FIG.

  In the coaxial inner / outer arrangement example of FIG. 16, the rotational speed of the outer motor unit acts on the bearing portions 22 and 23, and the relative rotational speed of the inner motor unit acts on the bearing portions 24 and 25. That is, the rotation speed acting on the bearing portions 22 to 25 is smaller than the output rotation speed of the output shaft 6 with respect to the case 2, and the stress received is reduced, thereby improving the reliability.

  In the tandem arrangement example 12 shown in FIG. 17, the stator 30 is fixed to the inner surface of the case 2, and the rotating field portion 41, the outer core 42, and the induction winding 44 of the composite rotor 400 are arranged on the inner diameter side of the stator 30. Is arranged. An intermediate shaft 4N is provided in the center of the outer core 42. One side (left side in the figure) of the intermediate shaft 4N in the axis AX direction extends, and one end 4N1 of the intermediate shaft 4N projects to the outside of the case 2. A bearing portion 26 is disposed between the outer peripheral surface of the intermediate shaft 4N near the one end portion 4N1 and the case 2. Further, the other side of the intermediate shaft 4N in the axis AX direction is expanded to form a bottomed cylindrical portion 4N2. An inner core 48 and a rotor winding 47 are disposed on the inner peripheral surface of the bottomed cylindrical portion 4N2. In this embodiment, the outer core 42 and the inner core 48 of the composite rotor 400 are sufficiently separated from each other, and a magnetic separation part is unnecessary.

  The rotor 50 is disposed on the inner diameter side of the inner core 48 of the composite rotor 400. An output shaft 60 extends through the center of the rotor 50. One side (the right side in the figure) of the output shaft 60 in the axis line AX extends, and one end 63 thereof projects outside the case 2. A bearing portion 27 is disposed between the outer peripheral surface of the output shaft 60 near the one end portion 63 and the case 2. The output shaft 60 also extends to the other side (left side in the figure) in the axis AX direction, and the bearing portion 28 is disposed between the other end portion 64 and the bottomed cylindrical portion 4N2 of the intermediate shaft 4N. . The intermediate shaft 4N and the output shaft 60 are rotatably supported by the case 2 by the cooperation of the bearing portions 26 to 28. The power source unit 7 is omitted in FIG.

  In the tandem arrangement example 12 of FIG. 17, the rotational speed of the outer motor unit acts on the bearing portion 26, and the relative rotational speed of the inner motor unit acts on the bearing portion 28. The bearing portion 27 is subjected to a large rotational speed obtained by adding the rotational speed of the output shaft 60 with respect to the case 2, that is, the rotational speeds of both motor units. Therefore, particularly when it is desired to increase the output rotational speed, it is preferable to improve the performance and reliability of the bearing portion 27 by measures such as direct injection of lubricating oil. On the other hand, since the manufacturing dimensions of the outer motor unit and the inner motor unit are similar, it is relatively easy to make the output characteristics of both motor units uniform.

  In each embodiment and example, a rotation angle sensor that detects the rotation phase of the composite rotors 4, 40, 400 and the output shafts 6, 60 is provided, and the inverter control unit 73 performs control while referring to the rotation phase. It is preferable. Moreover, although the example which has arrange | positioned the stator and rotor of each motor unit in coaxial inside / outside was shown, it is not limited to this, The motor unit of the structure which arranged the stator and the rotor in the axial direction may be sufficient.

  Moreover, it can be set as the structure which can input and interrupt | block external torque to the composite rotor 4 or the rotor 5. FIG. Thereby, the torque generated in the multi-rotor motor 1 can be output from the output shaft 7 in addition to the external torque. Alternatively, a mechanism for detachably fixing the composite rotor 4 to the case can be provided. Thus, when the load is light, the composite rotor 4 is fixed and only the inner (second) motor unit is used, and the loss of the outer (first) motor unit can be saved to improve the efficiency.

  It is also possible to provide two composite rotors. That is, a motor unit is formed between the stator and the first composite rotor, between the first and second composite rotors, and between the second composite rotor and the rotor, and the stator unit is connected to the stator from the power supply unit. It is possible to obtain a large output rotational speed with the rotor by sequentially applying three alternating currents with different frequencies to the windings, generating an induced electromotive force sequentially with the two composite rotors, and adding the rotational speed. . The present invention can be variously modified and applied.

DESCRIPTION OF SYMBOLS 1, 10: Multiple rotor type motor 11: Coaxial inside / outside arrangement example 12: Tandem arrangement example 2: Case 21-28: Bearing part 3, 30: Stator 31: Stator winding 31U1, 31U2: U-phase coil
31V1, 31V2: V phase coil 31W1: W phase coil 32: Core 4, 40, 400: Composite rotor 41: Rotating field part 42: Outer core 44: Induction winding 44U1, 44U2: U phase coil
44V1, 44V2: V-phase coil 44W1: W-phase coil 45: Magnetic separation part 47: Rotor winding 47U1, 47U2: U-phase coil
47V1, 47V2: V phase coil 47W1: W phase coil 48: Inner core 49: Connection lead 4M: Intermediate shaft 4N: Intermediate shaft 5, 50: Rotor 51: Output field part 52: Core 6, 60: Output shaft 7 : Power supply unit 71: DC power supply device 72: Inverter device 73: Inverter control unit 8: Toroidal coil group 81-84: U-V phase toroidal coil 85-87: VU phase toroidal coil 88, 89: WW phase Toroidal coil

Claims (11)

A stator having a stator winding that forms a stator rotating magnetic field and fixed to the case;
A rotating field portion that generates torque by electromagnetic interaction with the stator rotating magnetic field, an induction winding that generates induced electromotive force by electromagnetic induction action with the stator rotating magnetic field, and an electrical connection to the induction winding A rotor winding that forms a rotor rotating magnetic field in the same rotational direction as the stator rotating magnetic field, and a composite rotor that is rotatably supported by the case;
An output field portion that generates torque by electromagnetic interaction with the rotor rotating magnetic field, and a rotor that is rotatable in the same direction as the composite rotor and at a higher speed than the composite rotor;
An output shaft coupled to the rotor and rotatably supported by the case or the composite rotor;
A power supply unit for energizing two alternating currents having different frequencies in the stator winding;
A multi-rotor electric motor comprising: 2. The magnetic flux Φ <b> 1 of the first stator rotating magnetic field formed by the first alternating current having a frequency f <b> 1 that is supplied to the stator winding by the power source unit, the rotation speed n <b> 1, the stator winding, and the stator winding The torque T1 between the rotating field portion and the magnetic flux Φ2 of the second stator rotating magnetic field formed by the second alternating current having the frequency f2, the rotation speed n2, and the stator winding and the rotating field portion And a torque Tout between the rotor winding and the output field part,
The magnetic flux Φ1 <the magnetic flux Φ2, the torque T1 <the torque T2, and (the torque T2−the torque T1)> the torque Tout,
Further, the multi-rotor motor, wherein the rotation speed n1 <the rotation speed n2. In claim 2, when the rotation direction of the first stator rotating magnetic field and the second stator rotating magnetic field are the same, the rotation speed n1 <the rotation speed n2.
When the rotation directions of the first stator rotating magnetic field and the second stator rotating magnetic field are different, the rotation speed n1 is expressed as a negative value, and 0 <(the absolute value of the rotation speed n1) <(2 × the rotation speed). n2), a multi-rotor motor.   4. The magnetism according to claim 1, wherein the magnetic field that magnetically separates the core included in the rotor winding and the core included in the rotor winding and the core included in the rotor winding of the composite rotor. 5. A multi-rotor electric motor having a separation part.   5. The first motor unit configured by the stator winding of the stator and the rotating field portion of the composite rotor according to claim 1, and the rotor of the composite rotor. 6. A multi-rotor electric motor characterized in that the second motor unit constituted by the winding and the output field portion of the rotor have substantially the same output characteristics indicating the relationship between the rotational speed and the torque. .   6. The multi-rotor motor according to claim 5, wherein the second motor unit can output up to twice the number of rotations of the first motor unit.   7. The stator winding according to claim 1, wherein the stator winding of the stator, the induction winding of the composite rotor, and the rotor winding are all three-phase connected, and the induction A multi-rotor electric motor characterized in that the winding and the rotor winding are electrically connected with two phases interchanged.   8. The stator winding according to claim 1, wherein the stator winding of the stator, the induction winding of the composite rotor, and the rotor winding are all configured in the same coil configuration and in the circumferential direction. A multi-rotor electric motor characterized by the same order of arrangement.   9. The induction winding and the rotor winding of the composite rotor according to claim 8, wherein the induction winding and the rotor winding are three-phase connected, and the three-phase position of the induction winding of the composite rotor in the circumferential direction and the rotor winding A multi-rotor electric motor characterized by matching the position of the three phases of the wire.   10. The induction winding according to any one of claims 6 to 9, wherein each phase terminal is configured by performing Y connection or Δ connection in the induction winding and the rotor winding of the composite rotor, respectively. A multi-rotor motor, wherein two phases of the corresponding phase terminals of the rotor winding are switched and electrically connected.   7. The multi-rotor motor according to claim 1, wherein a toroidal coil group is used in place of the induction winding and the rotor winding of the composite rotor.

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