JP5340332B2 - Rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To equalize imbalance of radial force applied to a rotary shaft in a rotary electric machine where a magnetic field is applied to a rotor by field windings so as to make the rotor a single pole. <P>SOLUTION: In a rotary electric machine 10, a rotor 11 has magnetic salient poles 18 formed therein that are circumferentially arranged at regular intervals. A cylindrical stator 12 is arranged on an outer circumferential side of a rotor core 16, and has teeth 19 formed at regular intervals on an inner circumferential surface. Stator windings, which are concentrated windings, are wound around the teeth 19. The rotary electric machine 10 has a field yoke 13 provided on an outer circumference of the stator 12; and field windings 14 that form a magnetic circuit that makes the rotor 11 a single pole. Phase arrangement of the magnetic salient poles 18, the teeth 19, and the stator windings is set to be rotationally symmetric about a rotary shaft 15. The number Pn of the magnetic salient poles 18 and the number Ps of slots of the stator 12 have a common factor other than one. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to a rotating electrical machine in which a rotor is fielded by a field winding.

  A homopolar reluctance motor has been proposed as a rotary motor in which a rotor is fielded by a field winding, which suppresses an increase in radial deflection of the rotating shaft when the rotating shaft rotates at high speed (Patent Document). 1). In this homopolar reluctance motor, as shown in FIG. 12, a pair of rotors 52A and 52B having salient poles 51 are arranged in series with a predetermined interval, and the salient poles 51 of the rotors 52A and 52B are connected to each other. It is being fixed to the rotating shaft 53 in the state which mutually shifted | deviated. The stators 54A and 54B are arranged so as to surround the rotors 52A and 52B, respectively, and include torque generation drive coils (not shown) that generate torque in the rotors 52A and 52B. A field coil 55 for exciting the salient poles 51 is provided outside the stators 54A and 54B. When the field coil 55 is energized, a magnetic flux is formed from the salient pole 51 of one rotor 52A to the salient pole 51 of the other rotor 52B as shown in FIG. The salient poles 51 of the other rotor 52B are, for example, N poles, and the four salient poles 51 of the other rotor 52B are, for example, S poles.

JP-A-10-136622

  In the homopolar reluctance motor of Patent Document 1, all the salient poles 51 of one rotor 52A of the pair of rotors 52A and 52B fixed to the rotating shaft 53 become N poles, and the other rotor 52B All salient poles 51 become S poles. Therefore, it is easy to balance the radial force acting on the rotating shaft 53. However, it is necessary to provide two rotors and two stators, and the configuration is complicated and it is difficult to reduce the size.

  When the rotor is fielded by the field winding and has only one rotor and one stator in the rotating electric machine having a single pole, the configuration is simplified and the size is easily reduced. However, if concentrated winding is employed for the stator winding, the radial force acting on the rotor when energized acts unevenly due to the combination of the number of salient poles of the stator (stator) and rotor (rotor). This causes a problem that the load on the bearing that supports the rotating shaft increases, resulting in increased vibration and reduced life.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to reduce the radial force applied to the rotating shaft in a rotating electric machine in which a rotor is fielded so as to have a single pole by a field winding. An object of the present invention is to provide a rotating electrical machine that can eliminate the balance.

In order to achieve the above object, an invention according to claim 1 is a rotating electrical machine in which a rotor is fielded by a field winding. And, a rotor having a rotor core fixed to the rotating shaft so as to be integrally rotatable and having magnetic salient poles formed at regular intervals in the circumferential direction, and formed in a cylindrical shape and disposed on the outer peripheral side of the rotor core, and a three-phase alternating current stator formed at regular intervals on the inner circumferential surface teeth which stator winding is wound in concentrated winding, which is energized by, Rutotomoni provided outside the stator, axial sides And a field yoke for rotatably supporting the rotating shaft via a bearing, and a field winding for forming a magnetic circuit in which the rotor has a single pole. The magnetic salient poles and the teeth are arranged rotationally symmetrical about the rotating shaft, the phase arrangement of the stator windings is set rotationally symmetrical about the rotating shaft, and the magnetic the number of Pn of saliency, if the number of the stator slots and the Ps, Pn and Ps are have a common divisor other than 1, and Pn: Ps 4: 9,5: 12 one of Satisfied . Here, “the rotor has a single pole” means that the stator side end of a plurality of magnetic salient poles formed on the rotor core is all N poles or when the exciting current is supplied to the field windings. It means that it becomes the same magnetic pole of S pole. The “magnetic salient pole” means a portion where magnetic flux easily flows from the inner side to the outer surface of the rotor core, and is not limited to the shape having the protruding portions at a constant interval as the rotor core, but the protruding portion formed of a magnetic material. A non-magnetic portion may be provided in the rotor core so that the gap is filled with a non-magnetic material or has magnetic saliency, and the rotor core may be flat as a whole.

  In this invention, when the stator winding wound by concentrated winding on the teeth of the stator (stator) is excited, a rotating magnetic field is generated, and torque acts on the rotor (rotor) by the magnetic flux generated by the rotating magnetic field. On the other hand, in a state in which the exciting current is supplied to the field winding, the stator side end portions of all the magnetic salient poles formed on the rotor core of the rotor become the same magnetic pole. A radial force is applied to the rotating shaft by the interaction between the magnetic flux generated by the rotating magnetic field and the magnetic flux generated by the field winding. Magnetic salient poles and teeth are arranged rotationally symmetrical around the rotating shaft, the phase arrangement of the stator windings is set rotationally symmetrical around the rotating shaft, and the number of magnetic salient poles Is Pn, and the number of slots of the stator is Ps, Pn and Ps have a common divisor other than 1, so that there is no unbalance of the radial force applied to the rotating shaft.

According to a second aspect of the present invention, in the first aspect of the present invention, the rotor core is formed of a plurality of laminated electromagnetic steel sheets.

According to a third aspect of the present invention, in the second aspect of the present invention, the rotary shaft is formed in a double structure in which the magnetic resistance on the outer peripheral side is smaller than the magnetic resistance on the inner peripheral side.

The invention according to claim 4 is the invention according to claim 2 , wherein the rotor core is composed of a cylindrical core and a laminated core formed outside the cylindrical core, and the material of the cylindrical core is The magnetic resistance is configured to be smaller than the material of the laminated core.

  ADVANTAGE OF THE INVENTION According to this invention, the unbalance of the radial force added to a rotating shaft can be eliminated in the rotary electric machine by which a rotor is fielded so that it may become a single pole by a field winding.

(A) is a schematic cross section of a rotary electric motor, (b) is a front view of a rotor. FIG. 2A is a schematic cross-sectional view taken along the line II-II in FIG. 1, and FIG. 2B is a schematic cross-sectional view in a state where the rotor is rotated from the state of FIG. The schematic cross section of the rotary electric motor of a reference example. The graph which shows the change of radial force. The schematic cross section corresponding to Drawing 2 (b) of another embodiment. The schematic cross section of the rotary electric motor of another embodiment. The schematic cross section of the rotary electric motor of another embodiment. The schematic cross section of the rotary electric motor of another embodiment. The schematic cross section of the rotary electric motor of another embodiment. (A) is a schematic cross section of the rotary electric motor of another embodiment, (b) is a front view of the rotor of another embodiment. The front view of the rotor of another embodiment. The schematic cross-sectional perspective view of a prior art.

  Hereinafter, an embodiment in which the present invention is embodied in a three-phase rotary motor will be described with reference to FIGS. In addition, in the schematic cross-sectional views of FIGS. 2A and 2B and FIG. 3, the cross-sectional hatching is omitted for convenience of illustration.

  As shown in FIG. 1A, a rotary electric motor 10 as a rotating electrical machine includes a rotor (rotor) 11, a cylindrical stator (stator) 12 disposed outside the rotor 11, and the outside of the stator 12. And a field winding 14 for fielding the rotor 11. The field yoke 13 also functions as a case of the rotary electric motor 10, and has a cylindrical portion 13a facing the outer periphery of the stator 12, and a pair of disk portions 13b fixed to both ends of the cylindrical portion 13a.

  The rotor 11 has a rotor core 16 fixed to the rotary shaft 15 so as to be integrally rotatable. The rotary shaft 15 is rotatably supported by the disc portion 13b via a bearing 17 in a state of passing through the disc portion 13b. Yes. The rotating shaft 15 is made of a magnetic material.

  As shown in FIG. 1B, the rotor core 16 has protrusions that protrude in the radial direction at regular intervals in the circumferential direction, and the protrusions constitute magnetic salient poles 18. The magnetic salient poles 18 are arranged so as to be rotationally symmetric about the rotary shaft 15 when the rotor core 16 is viewed from the axial direction. In this embodiment, eight magnetic salient poles 18 are provided, and each magnetic salient pole 18 extends over the entire axial length of the rotor core 16. The rotor core 16 is configured by laminating a plurality of (for example, several tens) electromagnetic steel plates, and the axial magnetic resistance is larger than the radial and circumferential magnetic resistance. For this reason, in the rotor core 16, the magnetic flux hardly flows in the axial direction, and easily flows in the radial direction and the circumferential direction.

  The stator 12 is formed in a substantially cylindrical shape by laminating electromagnetic steel plates, and the radial and circumferential magnetic resistance of the stator 12 is smaller than the axial magnetic resistance. For this reason, in the stator 12, the magnetic flux easily flows in the circumferential direction and the radial direction of the stator 12, and hardly flows in the axial direction.

  As shown in FIG. 2, slots 20 are provided at equal intervals inside the stator 12 such that a plurality of teeth 19 are formed at regular intervals in the circumferential direction. The teeth 19 and the slots 20 are arranged so as to be rotationally symmetric about the rotary shaft 15 when the stator 12 is viewed from the axial direction. In this embodiment, 18 teeth 19 and 18 slots 20 are provided. Therefore, when the number of the magnetic salient poles 18 of the rotor core 16 is Pn and the number of the slots 20 of the stator 12 is Ps, Pn = 8, Ps = 18, and Pn and Ps have a common divisor other than 1, And Pn: Ps satisfies 4: 9.

  A U-phase winding 21u, a V-phase winding 21v, and a W-phase winding 21w as stator windings are wound around each tooth 19 in a concentrated manner. The U-phase winding 21u, the V-phase winding 21v, and the W-phase winding 21w are formed by the teeth 19 in which the windings of the same phase are wound in the order of the U phase, the V phase, and the W phase in the clockwise direction in FIG. It is wound around three by three. That is, the phase arrangement of the U-phase winding 21u, the V-phase winding 21v, and the W-phase winding 21w constituting the stator winding is set to be rotationally symmetric about the rotary shaft 15.

  An annular ridge 13c is formed on both disk portions 13b of the field yoke 13 so as to protrude toward the rotor core 16, and a bobbin having a field winding 14 wound around the outer periphery of the ridge 13c. 23 is fitted and fixed. The protrusion 13c and the bobbin 23 constitute a field winding winding portion around which the field winding 14 for forming a magnetic circuit in which the rotor 11 has a single pole is wound. The rotor 11 has a single pole when the stator 12 side ends of the plurality of magnetic salient poles 18 formed on the rotor core 16 are all N poles or S poles when the field winding 14 is supplied with an excitation current. Means the same magnetic pole.

  In this embodiment, when a current is supplied to each field winding 14, a magnetic circuit is formed in which the magnetic salient poles of the rotor core 16 are all the same magnetic pole (N pole) between the field yoke 13 and the rotor core 16. It has come to be. More specifically, in one field winding 14 located on the left side in FIG. 1A, the magnetic flux enters the inner peripheral side from the left side of the annular field winding 14 and the field winding 14 from the right side. Occurs to go outside. Further, in the other field winding 14 located on the right side in FIG. 1A, the magnetic flux enters the inner peripheral side from the right side of the annular field winding 14 and the outside of the field winding 14 from the left side. It occurs to go out. As a result, the path of the magnetic flux generated from both field windings 14 travels in the opposite direction in the rotary shaft 15, then passes through the magnetic salient pole 18 from the inside of the rotor core 16 and in the teeth 19 of the stator 12. , And a path for entering the rotary shaft 15 again through the cylindrical portion 13a and the disc portion 13b of the field yoke 13 is obtained.

Next, the operation of the rotary electric motor 10 configured as described above will be described.
The rotary motor 10 is used in a state where the U-phase winding 21u, the V-phase winding 21v, and the W-phase winding 21w are connected to a three-phase inverter and the field winding 14 is connected to a DC power source. The control device controls the amount of control current output from the three-phase inverter and the amount of current supplied from the DC power source to the field winding 14.

  When a direct current is supplied to the field winding 14, the magnetic flux (line of magnetic force) generated from the field winding 14 is rotated from the disk portion 13 b of the field yoke 13 as shown by a broken line in FIG. A magnetic circuit is formed that passes through the path of the shaft 15 → the rotor core 16 → the magnetic salient pole 18 → the stator 12 → the cylindrical portion 13 a of the field yoke 13 → the disk portion 13 b of the field yoke 13. As a result, in the state where the exciting current is supplied to the field winding 14, as shown in FIG. 2, all the end portions on the stator 12 side of the plurality of magnetic salient poles 18 formed on the rotor core 16 become N poles. The stator 12 becomes a single pole.

  On the other hand, the U-phase winding 21u, the V-phase winding 21v, and the W-phase winding 21w of the stator 12 are sequentially supplied with a three-phase alternating current having a predetermined frequency to generate a rotating magnetic field in the stator 12 and a rotating magnetic field in the rotor 11. Works. Then, the rotor 11 rotates in synchronization with the rotating magnetic field by the magnetic attractive force and the repulsive force between the rotating magnetic field and the magnetic flux of the magnetic salient pole 18. Further, the amount of magnetic flux to be generated can be adjusted by adjusting the amount of current supplied to the field winding 14. Therefore, by adjusting the amount of current supplied to the field winding 14, so-called “weak field control”, “strong field control”, and free field flux control can be performed.

  As shown in FIG. 2A, a pair of magnetic salient poles 18 having a mechanical angle of 180 degrees indicated by A is formed at the center tooth 19 of three adjacent teeth 19 around which the U-phase winding 21u is wound. In the state facing each other, the positional relationship with the teeth 19 of the other three pairs of magnetic salient poles 18 each having a mechanical angle of 180 degrees is also the same for each pair. More specifically, the magnetic salient pole 18 indicated by B faces the tooth 19 near the tooth 19 around which the U-phase winding 21u is wound, among the three adjacent teeth 19 around which the V-phase winding 21v is wound. . The magnetic salient pole 18 indicated by C includes a tooth 19 near the tooth 19 around which the W-phase winding 21w is wound, and a W-phase winding 21w, among the three adjacent teeth 19 around which the V-phase winding 21v is wound. Of the three adjacent teeth 19 around which the V-phase winding 21v is wound is opposed to the teeth 19 near the teeth 19 around which the V-phase winding 21v is wound. The magnetic salient pole 18 indicated by D faces the tooth 19 near the tooth 19 around which the U-phase winding 21u is wound, among the three adjacent teeth 19 around which the W-phase winding 21w is wound. Therefore, in this state, the radial force acting on each pair of magnetic salient poles 18 indicated by A, B, C, D forming a mechanical angle of 180 degrees is the same for each pair of magnetic salient poles 18. The radial force applied to the rotary shaft 15 is in a balanced state.

  Further, when the rotor 11 is rotated at an arbitrary angle from the state shown in FIG. 2A, for example, in the state shown in FIG. 2B, it is indicated by A, B, C, and D that form a mechanical angle of 180 degrees. The positional relationship of each pair of magnetic salient poles 18 with respect to the phase arrangement of the teeth 19 and the stator windings is the same for each pair of magnetic salient poles 18, and the radial force applied to the rotating shaft 15 is balanced. .

  On the other hand, even if the magnetic salient poles 18 and the teeth 19 are arranged rotationally symmetrical about the rotating shaft 15 and the phase arrangement of the stator windings is set rotationally symmetrical about the rotating shaft 15, When the number Pn of the magnetic salient poles 18 and the number Ps of the slots 20 of the stator 12 do not have a common divisor other than 1, the radial force applied to the rotating shaft 15 becomes unbalanced.

  For example, FIG. 3 shows a case where Pn = 5 and Ps = 12. The magnetic salient pole 18 is rotationally symmetric at 360/5 degrees, and the teeth 19 (phase arrangement) are rotationally symmetric at 360/2 degrees, but Pn and Ps have no common divisor other than 1. In the state shown in FIG. 3, each of the magnetic salient poles 18 indicated by A, B, C, D, and E includes a tooth 19 around which a U-phase winding 21u, a V-phase winding 21v, and a W-phase winding 21w are wound. Are different from each other, and the radial force applied to the rotary shaft 15 is unbalanced.

  FIG. 4 shows the radial force applied to the rotating shaft 15 when Pn = 8 and Ps = 18 (8 salient poles and 18 slots) and when Pn = 5 and Ps = 12 (5 salient poles and 12 slots). The simulation results are shown. In FIG. 4, the value on the vertical axis representing the radial force indicates a relative value with respect to the average value of the radial force, and 1.0 is the average value.

  As shown in FIG. 4, in the case of the eight salient poles and 18 slots which are the rotary electric motor 10 of the embodiment, the radial force is 0 over the range of the electrical angle of 0 to 360 degrees, that is, the radial in the specific direction on the rotary shaft 15. It was confirmed that no force was applied, that is, there was no imbalance of radial force applied to the rotating shaft 15. On the other hand, in the comparative example shown in FIG. 3, that is, in the case of 5 salient poles and 12 slots, it was confirmed that the radial force in a specific direction fluctuates in a cycle of 60 degrees within an electrical angle range of 0 to 360 degrees.

According to this embodiment, the following effects can be obtained.
(1) The rotary electric motor 10 is fixed to the rotary shaft 15 so as to be integrally rotatable, and has a rotor 11 having a rotor core 16 in which magnetic salient poles 18 are formed at regular intervals in the circumferential direction. Teeth 19 disposed on the outer peripheral side of the rotor core 16 and having stator windings wound in a concentrated manner is provided with a stator 12 formed on the inner peripheral surface at regular intervals. The rotary electric motor 10 includes a field yoke 13 provided on the outer periphery of the stator 12 and a field winding 14 for forming a magnetic circuit in which the rotor 11 has a single pole. The magnetic salient poles 18 and the teeth 19 are arranged rotationally symmetrically, the phase arrangement of the stator windings is set rotationally symmetrical, and the number of the magnetic salient poles 18 is Pn and the number Ps of the slots 20 of the stator 12 is Has a common divisor other than 1. Therefore, the radial force unbalance applied to the rotating shaft 15 can be eliminated.

  (2) The stator windings (U-phase winding 21u, V-phase winding 21v and W-phase winding 21w) are excited by a three-phase alternating current. Therefore, the configuration for generating a rotating magnetic field for generating torque in the rotor core 16 is the same as that of a generally used three-phase rotating electric motor and is simplified.

  (3) In the rotary motor 10, since the number Pn of the magnetic salient poles 18 is 8, and the number Ps of the slots 20 of the stator 12 is 18, Pn and Ps have a common divisor other than 1, and Pn: Ps Satisfies 4: 9. Therefore, the torque balance is also improved.

  (4) Since the field windings 14 are provided at both ends of the field yoke 13, the cross-sectional area of the cylindrical portion 13 a necessary for smoothly flowing a desired amount of magnetic flux to each magnetic salient pole 18. This contributes to reducing the size of the rotary electric motor 10.

  (5) The field winding portion is configured by fitting and fixing the bobbin 23 to an annular ridge 13c formed on the disc portion 13b. Therefore, the bobbin 23 around which the field winding 14 is wound can be fixed to the protrusion 13c, and the field winding 14 can be compared with the case where the field winding 14 is directly wound around the protrusion 13c protruding from the disk portion 13b. The winding operation of the magnetic winding 14 is simplified.

The embodiment is not limited to the above, and may be embodied as follows, for example.
The magnetic salient poles 18 and the teeth 19 are arranged rotationally symmetrically, the phase arrangement of the stator windings is set rotationally symmetrical, and the number Pn of the magnetic salient poles 18 and the number Ps of slots of the stator 12 are 1. In other words, the combination of the number Pn of the magnetic salient poles 18 and the number Ps of the slots 20 is not limited to Pn = 8 and Ps = 18. For example, in the rotary motor 10 in which the number Pn of the magnetic salient poles 18 is 5 and the number Ps of the slots 20 is 12 shown in FIG. 3, there is no common divisor other than Pn and Ps, and the radial applied to the rotating shaft 15 Although the force is unbalanced, the combination of Pn and Ps having a common divisor other than 1 can eliminate the unbalance of the radial force applied to the rotating shaft 15. For example, when Pn = 10 and Ps = 24 so that Pn and Ps have a common divisor other than 1, as shown in FIG. 5, A, B, C, D, and E form a mechanical angle of 180 degrees. The radial force acting on each pair of magnetic salient poles 18 shown is the same for each pair of magnetic salient poles 18, and the radial force applied to the rotating shaft 15 is balanced.

  The combination of the number Pn of the magnetic salient poles 18 and the number Ps of the slots 20 is not limited to Pn = 8, Ps = 18, Pn = 10, and Ps = 24. For example, a common divisor other than Pn and Ps is 1 And Pn: Ps is 1: 3, 2: 3, 4: 3, 4: 9, 5: 3, 5: 6, 5: 9, 5:12, 8: 9, 8:15, 8: Any one of 21 may be satisfied. However, among them, the combinations of Pn: Ps of 1: 3, 4: 3, 5: 3, 5: 6, 5: 9, 8: 9, 8:15, and 8:21 have large torque fluctuations. Therefore, any combination of Pn: Ps of 2: 3, 4: 9, and 5:12 that provides good torque balance is preferable.

  The rotary electric motor 10 may have a configuration in which the field winding 14 is provided on one side (one end side) of the field yoke 13. For example, as shown in FIG. 6, the field yoke 13 has a disc portion 13b provided only on one end side of the cylindrical portion 13a, and a support disc 24 formed of a nonmagnetic material on the other end side. The support disk 24 forms a case of the rotary electric motor 10 together with the field yoke 13, and supports the other end of the rotary shaft 15 via the bearing 17. In this embodiment, when a current is supplied to the field winding 14, the magnetic flux is changed from the disk portion 13 b of the field yoke 13 → the rotating shaft 15 → the rotor core 16 → the magnetic salient pole 18 → the stator 12 → the field yoke 13. A magnetic circuit passing through the path of the cylindrical portion 13a → the disk portion 13b of the field yoke 13 is formed, and each magnetic salient pole 18 becomes an N pole. In this case, unlike the embodiment in which the field winding 14 is provided on both sides of the cylindrical portion 13a, the cylinder necessary for the magnetic flux flowing through each magnetic salient pole 18 to return to the disk portion 13b through the cylindrical portion 13a. The cross-sectional area of the portion 13a is doubled.

  As shown in FIG. 7, the rotor core 16 is composed of a cylindrical core 16a formed in a cylindrical shape and fixed to the rotary shaft 15, and a laminated rotor core 16b provided on the outer periphery of the cylindrical core 16a. The tip of the ridge 13c may be extended to the vicinity of the end face of the cylindrical core 16a and the thickness of the ridge 13c may be increased so that the diameter of the rotating shaft 15 is reduced accordingly. The magnetic salient pole 18 is formed on the laminated rotor core 16b. The cylindrical core 16a is formed of an integral magnetic material, and specifically, is formed of a powder molded magnetic body (SMC: Soft Magnetic Composites). The magnetic resistance of the powder molded magnetic body is smaller than the material of the laminated rotor core 16b and the rotating shaft 15. In this case, the magnetic flux generated in the field winding 14 is more likely to flow through the cylindrical core 16 a than the rotary shaft 15, and the path length of the magnetic flux is shorter than when the magnetic flux flows through the rotary shaft 15. As a result, the amount of field current can be reduced. In the laminated rotor core 16b, the magnetic flux hardly flows in the axial direction and easily flows in the radial direction and the circumferential direction. On the other hand, in the cylindrical core 16a, the magnetic flux flows more easily in the axial direction than in the laminated rotor core 16b. Become. For this reason, compared with the structure without the cylindrical core 16a, the path of the magnetic flux is easily distributed to all the electromagnetic steel sheets constituting the laminated rotor core 16b.

The rotor cores 16 and 16b are formed by laminating electromagnetic steel plates, but may be formed by iron blocks or SMC.
As shown in FIG. 8, the rotary shaft 15 may be formed in a double structure in which the magnetic resistance on the outer peripheral side is smaller than the magnetic resistance on the inner peripheral side. In this case, when a current is supplied to the field winding 14 and the magnetic flux generated from the field winding 14 flows toward the rotor core 16, the magnetic flux flows on the outer peripheral side having a small magnetic resistance, so the path length of the magnetic flux is short. Become. As a result, the amount of field current can be reduced.

  As shown in FIG. 8, a dedicated case 25 may be provided in the rotary electric motor 10, and the rotary shaft 15 may be supported by the case 25 via a bearing 17. In this case, the shape of the disk portion 13b of the field yoke 13 is simplified. In addition, the shape and material of the case 25 are more flexible than when the field yoke 13 is also used as a case. Although FIG. 8 illustrates a case where the rotary shaft 15 has a double structure, the present invention is not limited to a double structure.

As shown in FIG. 9, the shaft diameter may be reduced at the bearing portion. In this case, it is possible to reduce the diameter of the bearing.
○ The arrangement of the U-phase winding 21u, the V-phase winding 21v and the W-phase winding 21w wound around the teeth 19 is such that each of the teeth 19 around which the windings are wound is divided into two groups (rotation symmetry at 360/2 degrees). It is not restricted to the structure divided. For example, as shown in FIG. 10A, in the rotary motor 10 with Pn = 10 and Ps = 24, the teeth 19 around which the windings are wound are divided into four groups (360/4 degree rotational symmetry). A configuration may be used.

  The shape of the rotor core 16 is not limited to a shape having a protrusion for forming the magnetic salient pole 18. For example, as shown in FIG. 10 (b), the rotor core 16 is formed with a magnetic material in a portion having protrusions at regular intervals, and the space between the protrusions is filled with a non-magnetic material 26 to form a flat shape as a whole. It may be what you did. Moreover, as shown in FIG. 11, even if only the tip of the protrusion is connected to the tip of the adjacent protrusion, the magnetic salient pole may be substantially formed.

O Without providing the bobbin 23, the field winding 14 may be directly wound around the outer periphery of the protrusion 13c, and the protrusion 13c may be used as the field winding winding portion.
○ The U-phase winding 21u, the V-phase winding 21v, and the W-phase winding 21w as the stator windings are not in a state in which a part of the two windings are accommodated in one slot 20, respectively. The slot 20 may be configured such that a part of one stator winding is accommodated.

When the rotor 11 has a single pole, the end portions of the magnetic salient poles 18 on the stator 12 side may not be all N poles but all S poles.
The magnetic salient pole 18 may be formed shorter than the entire length without extending over the entire length of the rotor core 16.

The rotary electric motor 10 is not limited to being driven by a three-phase alternating current, but may be driven by a single-phase alternating current, a two-phase alternating current, or a multiphase alternating current of four or more phases.
○ It may be applied to a generator instead of an electric motor.

The following technical idea (invention) can be understood from the embodiment.
(1) Before Symbol field winding are provided at both ends of the field magnet yoke.

(2) pre-Symbol rotating shaft, the magnetic resistance of the outer peripheral side is formed on the magnetoresistive smaller double structure of the inner circumferential side.

(3) pre-Symbol rotor core is composed of a laminated core formed on the outside of the cylindrical core and the cylindrical core, the material of the tubular core is composed reluctance is smaller than the material of the laminated core .

  DESCRIPTION OF SYMBOLS 10 ... Rotary motor as a rotary electric machine, 11 ... Rotor (rotor), 12 ... Stator (stator), 13 ... Field yoke, 14 ... Field winding, 15 ... Rotating shaft, 16 ... Rotor core, 18 ... Magnetic Target salient poles, 19 ... teeth, 20 ... slots, 21u ... U-phase winding as a stator winding, 21v ... also V-phase winding, 21w ... also W-phase winding.

Claims (4)

A rotating electric machine in which a rotor is fielded by a field winding,
A rotor having a rotor core fixed to a rotating shaft so as to be integrally rotatable and having magnetic salient poles formed at regular intervals in the circumferential direction;
A stator that is formed in a cylindrical shape and arranged on the outer peripheral side of the rotor core, and teeth in which a stator winding excited by a three-phase alternating current is wound in a concentrated manner is formed on the inner peripheral surface at regular intervals. When,
Rutotomoni provided outside the stator, the field yoke for rotatably supporting the rotary shaft via the bearing in the axial direction on both sides,
A field winding for forming a magnetic circuit in which the rotor has a single pole;
The magnetic salient poles and the teeth are arranged rotationally symmetrical about the rotary shaft, the phase arrangement of the stator windings is set rotationally symmetrical about the rotary shaft, and the magnetic salient when the number of poles Pn, the number of the stator slots and Ps, Pn and Ps are have a common divisor other than 1, and Pn: Ps 4: 9,5: 12 satisfies either Rotating electric machine. The rotating electrical machine according to claim 1, wherein the rotor core is formed of a plurality of laminated electromagnetic steel plates . The rotating electrical machine according to claim 2, wherein the rotary shaft is formed in a double structure in which an outer peripheral side magnetic resistance is smaller than an inner peripheral side magnetic resistance . The said rotor core is comprised by the cylindrical core and the laminated core formed in the outer side of the said cylindrical core, and the material of the said cylindrical core is comprised by the magnetic resistance smaller than the material of the said laminated core. The rotating electrical machine described.

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