JP2010136524A - Rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve holding force of a rotor winding against centrifugal force while suppressing magnetic effects in a rotary electric machine in which a winding is wound around a rotor. <P>SOLUTION: In a stator 12, a circumferential fluctuation cycle (an electrical angle of 360°) of magnetomotive force generated by the flow of an AC current in stator windings 28u, 28v, and 28w is 1/n (n is an integer of ≥2) of the whole circumference of the stator. In rotor windings 18n, 18s, a circumferential inner width (α°) is equal to the sum of each circumferential width (α0°) of rotor teeth 19 and m-fold (m is an integer of ≥1 satisfying m<n) of the fluctuation cycle of the magnetomotive force. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rotating electrical machine in which a stator and a rotor are arranged to face each other in a radial direction orthogonal to a rotor rotation axis, and more particularly to a rotating electrical machine in which a winding is wound around a rotor.

  The related arts of a rotating electrical machine in which a winding is wound around a rotor are disclosed in Patent Documents 1 to 4 below. In Patent Document 1, a main power generation winding and an excitation winding are provided in a stator, a field winding and a field auxiliary winding are provided in a rotor, and the stator excitation winding is short-circuited via a diode to provide a field assistance for the rotor. The current flowing from the winding to the field winding is rectified by a rectifier. In Patent Document 1, when the rotor starts to rotate, a voltage is induced in the excitation winding of the stator by the residual magnetism of the field core in the rotor, and an excitation current flows in one direction via the diode, generating a static magnetic field in the stator. To do. Since the rotor rotates in the static magnetic field, a voltage is induced in the field auxiliary winding wound around the rotor field core, and the field current rectified by the rectifier flows into the field winding. The magnetic poles of N pole and S pole are generated in the rotor.

  In the following Patent Document 2, a reactor is connected to a main power generation winding of a stator wound in a concentrated full-pitch manner instead of providing the above-described exciting winding in the stator. In Patent Document 2, when the rotor starts to rotate, an electromotive force is induced in the main generator winding of the stator by the residual magnetic field of the rotor core, and this electromotive force causes a reactor excitation current in a closed circuit including the main generator winding and the reactor. Flows as an armature current to generate an armature reaction magnetic field. Since the main generator winding of the stator is a concentrated full-pitch winding, the armature reaction magnetic field includes a harmonic component (fifth spatial harmonic magnetic field), and the armature including the fifth spatial harmonic magnetic field. An electromotive force is generated in the field auxiliary winding by the reaction magnetic field interlinking with the field auxiliary winding of the rotor. This electromotive force is converted into a direct current by a diode bridge circuit and supplied to the field winding of the rotor as a field current, thereby generating N-pole and S-pole magnetic poles in the rotor.

  In the following Patent Document 3, the field auxiliary winding of the rotor is omitted, and the field winding of the full-pitch rotor is short-circuited via a diode. In Patent Document 3, when the rotor starts to rotate, an electromotive force is induced in the main generator winding of the stator by the residual magnetic field of the rotor core, and this electromotive force causes a reactor exciting current in a closed circuit including the main generator winding and the reactor. Flows as an armature current to generate an armature reaction magnetic field. Then, an electromotive force is induced in the field winding of the rotor that is magnetically coupled to the odd-order spatial harmonic components of the armature reaction magnetic field, and the field current rectified by the diode flows in the field winding. Thus, N pole and S pole magnetic poles are generated in the rotor. Furthermore, in the following Patent Document 4, field current flowing through the field winding is increased by connecting in parallel the field windings of the above-mentioned full-pitch rotor.

Japanese Patent Laid-Open No. Sho 62-23348 JP-A-4-285454 JP-A-8-65976 JP-A-11-220857

  In a rotating electrical machine in which a winding is wound around a rotor, a centrifugal force acts on the winding as the rotor rotates, so that it is necessary to prevent the winding from being detached from the rotor due to the centrifugal force. However, in order to hold the rotor windings, if the tip of the rotor teeth around which the rotor windings are wound is provided with a teeth cap or a wedge is provided in the slot between the rotor teeth, the cross-sectional shape of the rotor core (magnetic path) ) Decreases the torque or increases the loss due to the eddy current loss at the wedge portion, which reduces the efficiency of the rotating electrical machine. Therefore, it is required to improve the holding force of the rotor winding against the centrifugal force while suppressing the magnetic influence. Such a problem occurs not only in the rotating electrical machines of Patent Documents 1 to 4, but also in a wound synchronous machine, a wound induction machine, and the like, and occurs in a rotating electrical machine in which a winding is wound around a rotor.

  An object of the present invention is to improve the holding power of a rotor winding against centrifugal force while suppressing magnetic influence in a rotating electrical machine in which a winding is wound around a rotor.

  The rotating electrical machine according to the present invention employs the following means in order to achieve the above-described object.

  A rotating electrical machine according to the present invention is a rotating electrical machine in which a stator and a rotor are arranged to face each other in a radial direction orthogonal to the rotor rotation axis, and the rotor includes a plurality of rotor teeth protruding around the stator around the rotor rotation axis. And a rotor winding wound around the rotor tooth through a slot between the rotor teeth, and the stator is wound around the stator core. A variation period in the circumferential direction of the magnetomotive force generated when an alternating current flows through the stator winding is 1 / n (n is an integer of 2 or more) of the entire circumference of the stator. In the rotor winding, the inner width in the circumferential direction is substantially equal to the sum of the width of the rotor teeth in the circumferential direction and m times the fluctuation period of the magnetomotive force (m is an integer of 1 or more that satisfies m <n). Shi And gist comprises a winding portion.

  In one aspect of the present invention, the stator forms a rotating magnetic field including a harmonic component by flowing an alternating current through a stator winding wound in a concentrated winding around the stator core, and the rotor winding is formed of the stator. An induced electromotive force is generated by interlinking of rotating magnetic fields including harmonic components, and the rotor further includes a rectifying element that rectifies the current flowing through the rotor windings as the induced electromotive force is generated. It is preferable that the magnet functions as a magnet having a fixed magnetic pole by being magnetized according to the current rectified by the rectifying element flowing in the rotor winding.

  In one aspect of the present invention, the rotor windings wound around the rotor teeth adjacent in the circumferential direction are electrically separated from each other, and a rectifying element is provided for each of the electrically separated rotor windings. Preferably, each rectifier element rectifies the current flowing in the rotor winding wound around the circumferentially adjacent rotor teeth in a direction in which the magnetic poles of the adjacent rotor teeth are different from each other.

  The rotating electrical machine according to the present invention is a rotating electrical machine in which a stator and a rotor are arranged opposite to each other in a radial direction orthogonal to the rotor rotation axis, and the rotor includes a plurality of rotor teeth projecting to the stator around the rotor rotation axis. And a rotor winding wound around the rotor teeth through a slot between the rotor teeth. The stator includes a stator core and the stator core. And a fluctuation period in the circumferential direction of magnetomotive force generated by an alternating current flowing through the stator winding is 1 / n of the entire circumference of the stator (n is an integer of 2 or more) And the rotor winding passes through a slot whose interval in the circumferential direction is approximately equal to (m + 0.5) times the magnetomotive force variation period (m is an integer of 1 or more that satisfies m <n). And gist comprises a wound has been wound portion Isu.

  According to the present invention, it is possible to improve the holding force of the rotor winding against the centrifugal force while suppressing the magnetic influence by expanding the winding width of the rotor winding in the circumferential direction in units of the fluctuation period of the magnetomotive force of the stator. it can.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described with reference to the drawings.

  1-3 is a figure which shows schematic structure of the rotary electric machine 10 which concerns on embodiment of this invention. FIG. 1 shows an outline of the configuration of the stator 12 and the rotor 14 viewed from a direction parallel to the rotor rotation shaft 22, FIG. 2 shows an outline of the configuration of the stator 12, and FIG. 3 shows an outline of the configuration of the rotor 14. The rotating electrical machine 10 according to the present embodiment includes a stator 12 fixed to a casing (not shown), and a rotor 14 that is disposed to face the stator 12 with a predetermined gap and is rotatable with respect to the stator 12. 1 to 3 show a radial type rotating electrical machine in which the stator 12 and the rotor 14 are opposed to each other in a radial direction orthogonal to the rotation shaft 22 (hereinafter simply referred to as a radial direction). Arranged radially inside.

  The stator 12 includes a stator core 26 and a plurality of phases (more specifically, odd-numbered, for example, three-phase) stator windings 28 u, 28 v, 28 w disposed on the stator core 26. A plurality of stator teeth 30 protruding radially inward (toward the rotor 14) are arranged on the stator core 26 at intervals from each other along a circumferential direction around the rotation shaft 22 (hereinafter simply referred to as a circumferential direction). A slot 31 is formed between the stator teeth 30. That is, the stator core 26 is formed with a plurality of slots 31 spaced apart from each other in the circumferential direction. The stator windings 28 u, 28 v, 28 w of each phase are wound around the stator teeth 30 through the slots 31 between the stator teeth 30. 1 and 2 show an example in which the stator windings 28u, 28v, and 28w are wound around the stator teeth 30 in a short concentrated winding. By passing a plurality of phases (three phases or odd phases) of alternating current through the plurality of phases (three phases or odd phases) stator windings 28u, 28v, 28w, the stator teeth 30 arranged in the circumferential direction are sequentially magnetized. A rotating magnetic field that rotates in the circumferential direction can be formed in the stator 12. A rotating magnetic field formed on the stator 12 acts on the rotor 14.

  In the stator 12, a set of stator windings 28u, 28v, 28w is wound around the stator teeth 30 to form two poles (one pole pair) of magnetic poles (a rotating magnetic field is formed), and n sets The stator windings 28u, 28v, and 28w (n is an integer of 2 or more) are wound around the stator teeth 30 to form magnetic poles for 2n poles (n pole pairs) (a rotating magnetic field is formed). . In the example shown in FIGS. 1 and 2, four sets of stator windings 28u, 28v, and 28w are wound around the stator teeth 30 to form magnetic poles for eight poles (four pole pairs), and eight poles (4 A rotating magnetic field corresponding to a pole pair) is formed. The magnetomotive force generated by the alternating current flowing through the stator windings 28u, 28v, 28w has a distribution that varies in the circumferential direction. The magnetomotive force due to the alternating current flowing in the pair of stator windings 28u, 28v, 28w has a fluctuation distribution for one period in the circumferential direction, and the number of times the fluctuation of the magnetomotive force distribution is repeated in the circumferential direction is determined by the stator winding. It is equal to the number n of pairs 28u, 28v, 28w (4 times in the examples shown in FIGS. 1 and 2). That is, the fluctuation period of the magnetomotive force in the circumferential direction is 1 / n of the entire circumference of the stator (in the example shown in FIGS. 1 and 2, the circumference of the stator is 1/4). As shown in FIG. 2, when an angle corresponding to one period of magnetomotive force fluctuation in the circumferential direction is an electrical angle of 360 °, a relationship of (electrical angle = mechanical angle × number of pole pairs) is established.

  The rotor 14 includes a rotor core 16 and a plurality of rotor windings 18n and 18s disposed on the rotor core 16. In the rotor core 16, a plurality of rotor teeth (saliency poles) 19 protruding outward in the radial direction (toward the stator 12) are arranged at intervals from each other along the circumferential direction, and slots are formed between the rotor teeth 19. 51 is formed. That is, a plurality of slots 51 are formed in the rotor core 16 at intervals in the circumferential direction. Each rotor tooth 19 faces the stator 12 (stator teeth 30). In the rotor 14, due to the rotor teeth (saliency poles) 19, the magnetic resistance when the magnetic flux from the stator 12 passes changes according to the rotation direction, and the magnetic resistance is lowered at the position of the rotor teeth 19. The magnetic resistance increases at the position between. The interval between the adjacent rotor teeth 19 in the circumferential direction (the interval between the slots 51) is equal to 1 / k (k is a positive even number) of the fluctuation period (electrical angle 360 °) in the circumferential direction of the magnetomotive force. Or almost equal). In the example illustrated in FIGS. 1 to 3, the interval between the adjacent rotor teeth 19 in the circumferential direction (the interval between the slots 51) is equal to (or substantially equal to) half the magnetomotive force fluctuation period (electrical angle 180 °). ). Therefore, the plurality of rotor teeth 19 includes a set of rotor teeth 19 whose intervals in the circumferential direction are equal to (or substantially equal to) the magnetomotive force variation period (electrical angle 360 °).

  The rotor windings 18 n and 18 s are not electrically connected to each other but are separated (insulated), and are wound around the rotor teeth 19 through the slots 51 between the rotor teeth 19. Diodes 21n and 21s (rectifier elements) are connected to the rotor windings 18n and 18s, respectively. Since the rotor winding 18n is short-circuited via the diode 21n, the direction of the current flowing through the rotor winding 18n is rectified in one direction by the diode 21n, and the rotor winding 18s is short-circuited via the diode 21s. Thus, the direction of the current flowing through the rotor winding 18s is rectified in one direction by the diode 21s. Here, the diodes 21n and 21s are in opposite directions and the rotor windings 18n and 18s so that the directions of the currents flowing in the rotor winding 18n and the rotor winding 18s (rectification directions by the diodes 21n and 21s) are opposite to each other. Connected to each.

  As shown in FIG. 4, in the rotor winding 18n, the inner width in the circumferential direction around the rotating shaft 22 (the width between the inner peripheral surfaces of the winding, α ° in the figure) is the width of the rotor teeth 19 in the circumferential direction. (Α0 ° in the figure) and equal to (or substantially equal to) the sum of m times the magnetomotive force fluctuation period (electrical angle 360 °) in the circumferential direction (m is an integer of 1 or more that satisfies m <n). That is, α = α0 + 360 × m (the units of α and α0 are electrical angles) is established (or almost established). Similarly, in the rotor winding 18s, the inner width in the circumferential direction is equal to (or substantially equal to) the sum of the width of the rotor teeth 19 in the circumferential direction and m times the fluctuation period of the magnetomotive force in the circumferential direction. Since the interval between the rotor teeth 19 adjacent to each other in the circumferential direction (the interval between the slots 51) is ½ of the magnetomotive force variation period (electrical angle 180 °), the two slots 51 through which the rotor windings 18n and 18s pass are provided. The interval in the circumferential direction is equal to (or approximately equal to) (m + 0.5) times the magnetomotive force fluctuation period. In the example shown in FIG. 4, the inner width (α °) of the rotor windings 18n and 18s in the circumferential direction is the width of the rotor teeth 19 in the circumferential direction (α0 °) and the fluctuation period of the magnetomotive force in the circumferential direction (electrical angle 360). °) and the sum (α = α0 + 360). The circumferential interval between the two slots 51 through which the rotor windings 18n and 18s pass is equal to (or substantially equal to) 1.5 times the magnetomotive force variation period (electrical angle 540 °).

  The rotor winding 18s is not shown in the figure and only the rotor winding 18n is shown in FIG. 5, and the rotor winding 18n is not shown in the figure and only the rotor winding 18s is shown in FIG. As shown in FIG. 5, every other rotor winding 18n is wound around the rotor teeth 19 in the circumferential direction. As shown in FIG. 6, the rotor winding 18s is wound around the rotor teeth 19 around which the rotor winding 18n is not wound, and is wound around every other rotor tooth 19 in the circumferential direction. That is, the rotor windings 18n and 18s are arranged so that the rotor teeth 19 around which the rotor winding 18n is wound and the rotor teeth 19 around which the rotor winding 18s is wound are adjacent and alternately arranged in the circumferential direction. 19 is wound.

  The distribution in the circumferential direction of the magnetomotive force that generates the rotating magnetic field in the stator 12 is based on the arrangement of the stator windings 28u, 28v, 28w of each phase and the shape of the stator core 26 by the stator teeth 30 and the slots 31 (basic It does not have a sinusoidal distribution (only of waves), but includes harmonic components. In particular, in the concentrated winding, the stator windings 28u, 28v, 28w of the respective phases do not overlap each other, so that the amplitude level of the harmonic component generated in the magnetomotive force distribution of the stator 12 increases. For example, when the stator windings 28u, 28v, and 28w are three-phase concentrated windings, the amplitude level of the input electrical frequency tertiary component increases as a harmonic component. In the following description, a harmonic component generated in the magnetomotive force due to the arrangement of the stator windings 28u, 28v, 28w and the shape of the stator core 26 is referred to as a spatial harmonic.

  In response to the rotating magnetic field (fundamental wave component) formed on the stator 12 by applying a three-phase alternating current to the three-phase stator windings 28u, 28v, 28w, the magnetic resistance of the rotor 14 is increased. So that the rotor teeth 19 are attracted to the rotating magnetic field of the stator 12. As a result, torque (reluctance torque) acts on the rotor 14, and the rotor 14 is rotationally driven in synchronization with the rotating magnetic field (fundamental wave component) formed by the stator 12.

  Further, when a rotating magnetic field including a spatial harmonic component formed on the stator 12 is linked to the rotor windings 18n and 18s of the rotor 14, the rotor windings 18n and 18s are rotated by the spatial harmonic component. Magnetic flux fluctuations having a frequency different from the frequency (the fundamental wave component of the rotating magnetic field) occur. Due to this magnetic flux variation, an induced electromotive force is generated in each rotor winding 18n, 18s. The current flowing through the rotor windings 18n and 18s along with the generation of the induced electromotive force is rectified by the diodes 21n and 21s to be unidirectional (direct current). The rotor teeth 19 are magnetized in response to the direct current rectified by the diodes 21n and 21s flowing into the rotor windings 18n and 18s, so that the magnetic poles are changed to either the N pole or the S pole. ) A fixed magnet is generated in each rotor tooth 19. Since the directions of DC currents rectified by the diodes 21n and 21s are opposite to each other in the rotor winding 18n and the rotor winding 18s wound around the rotor teeth 19 adjacent in the circumferential direction, they are adjacent in the circumferential direction. Magnets of different magnetic poles are formed with the opposite directions of magnetization between the rotor teeth 19, and the magnetic poles of the rotor teeth 19 alternate in the circumferential direction. Here, the rotor by the diodes 21n and 21s is formed so that the N pole is formed in the rotor tooth 19 around which the rotor winding 18n is wound, and the S pole is formed in the rotor tooth 19 around which the rotor winding 18s is wound. The rectification directions of the currents of the windings 18n and 18s are respectively set. As a result, the magnets generated in each rotor tooth 19 have N poles and S poles alternately arranged in the circumferential direction, and one rotor teeth 19 (N pole and S pole) adjacent to each other in the circumferential direction provide one magnet. A pole pair is constructed. In the example shown in FIG. 3, eight poles are formed, and the number of pole pairs of the rotor 14 is four. Then, the magnetic field of each rotor tooth 19 (magnet with a fixed magnetic pole) interacts with the rotating magnetic field (fundamental wave component) of the stator 12 to cause attraction and repulsion. Torque (torque corresponding to magnet torque) is applied to the rotor 14 by electromagnetic interaction (attraction and repulsion) between the rotating magnetic field (fundamental wave component) of the stator 12 and the magnetic field of the rotor teeth 19 (magnet). The rotor 14 is driven to rotate in synchronization with the rotating magnetic field (fundamental wave component) formed by the stator 12. As described above, the rotating electrical machine 10 according to the present embodiment can function as an electric motor that generates power (mechanical power) in the rotor 14 using power supplied to the stator windings 28u, 28v, and 28w. On the other hand, the rotating electrical machine 10 according to the present embodiment can also function as a generator that generates power in the stator windings 28u, 28v, and 28w using the power of the rotor 14.

  When the rotor 14 rotates, centrifugal force acts on the rotor windings 18n and 18s. As shown in FIG. 7, when the rotor windings 18n and 18s are wound around the rotor teeth 19 with a short-pitch winding, the tension F2 of the rotor windings 18n and 18s out of the centrifugal force F0 applied to the rotor windings 18n and 18s. The ratio of the component becomes small, and the force F1 for scattering the rotor windings 18n and 18s by the centrifugal force F0 increases. Therefore, the rotor windings 18n and 18s are easily detached from the rotor teeth 19. In order to hold the rotor windings 18n and 18s, a tooth ridge 19a is provided at the tip of the rotor tooth 19 as shown in FIG. 8, or a wedge 19b is provided in the slot 51 between the rotor teeth 19 as shown in FIG. In such a case, the magnetic influence cannot be ignored, such as a decrease in torque due to a change in the cross-sectional shape (magnetic path) of the rotor teeth 19 and an increase in loss due to eddy current loss in the wedge 19b.

  On the other hand, in the present embodiment, the inner width (α °) of the rotor windings 18n and 18s in the circumferential direction is set so that the magnetomotive force fluctuation period (electrical angle 360) is larger than that in the case of the short-pitch winding (shown in FIG. 7). (°) is expanded by m times (in the example shown in FIGS. 3 to 6, m = 1). As a result, as shown in FIG. 10, the ratio of the component that becomes the tension F2 of the rotor windings 18n and 18s in the centrifugal force F0 applied to the rotor windings 18n and 18s increases, and the rotor windings 18n and 18s are scattered. The force F1 to be reduced is reduced. Further, the force F1 for scattering the rotor windings 18n and 18s can be received on the side surface of the rotor teeth 19. Therefore, the holding force of the rotor windings 18n and 18s against the centrifugal force can be improved, and the rotor windings 18n and 18s can be reliably prevented from being detached from the rotor teeth 19 by the centrifugal force.

  Further, since the inner width (α °) of the rotor windings 18n and 18s in the circumferential direction is widened in units of magnetomotive force fluctuation period (electrical angle 360 °), the fluctuation of the interlinkage magnetic flux of the rotor windings 18n and 18s is The change is almost the same as before the winding width is increased (in the case of short-pitch winding) (the interlinkage magnetic flux for an electrical angle of 360 ° is always 0 as a whole). Furthermore, the arrangement of the magnetic poles (N pole, S pole) formed on each rotor tooth 19 is not changed compared to before the winding width is increased (in the case of short-pitch winding). For this reason, there is little magnetic influence by increasing the winding width of the rotor windings 18n, 18s, and the torque characteristics hardly change compared to before the winding width is increased. Therefore, it is possible to improve the holding force of the rotor windings 18n and 18s against the centrifugal force while suppressing the magnetic influence. Note that although the winding resistance increases as the winding width of the rotor windings 18n and 18s is increased, only the coil end portion increases in one turn of the winding, so the increase in winding resistance is slight. It is.

  Next, another configuration example of the rotating electrical machine 10 according to the present embodiment will be described.

  FIG. 11 shows an example in which 12 poles (rotor teeth 19) are formed on the rotor 14 and the rotor 14 has 6 pole pairs. The interval in the circumferential direction between the two slots 51 through which the rotor windings 18n and 18s pass is equal to 1.5 times the fluctuation period of the magnetomotive force (electrical angle 540 °), and within the rotor windings 18n and 18s in the circumferential direction. The width (α °) is equal to the sum of the width of the rotor teeth 19 in the circumferential direction (α0 °) and the magnetomotive force fluctuation period (electrical angle 360 °). Also in this example, the holding force of the rotor windings 18n and 18s against the centrifugal force can be improved while suppressing the magnetic influence.

  In the present embodiment, as shown in FIG. 12, for example, the inner width (α °) of the rotor windings 18n and 18s in the circumferential direction is set to have a magnetomotive force variation period (electrical angle of 360 °) as compared with the case of a short-pitch winding. ) Can be expanded by more than twice. In the example shown in FIG. 12, the interval in the circumferential direction between the two slots 51 through which the rotor windings 18n and 18s pass is equal to 2.5 times the fluctuation period of the magnetomotive force (electrical angle 900 °), and the rotor in the circumferential direction. The inner width (α °) of the windings 18n and 18s is equal to the sum of the width (α0 °) of the rotor teeth 19 in the circumferential direction and twice the fluctuation period of the magnetomotive force (electrical angle 360 °). By further increasing the winding width of the rotor windings 18n and 18s, the ratio of the component that becomes the tension F2 of the rotor windings 18n and 18s in the centrifugal force F0 applied to the rotor windings 18n and 18s further increases. The force F1 that tries to scatter the lines 18n and 18s is further reduced.

  In this embodiment, for example, as shown in FIGS. 13 and 14, the rotor winding 18 n has an inner width (α °) in the circumferential direction that is the width of the rotor tooth 19 (α0 °) in the circumferential direction and a variation in magnetomotive force. A winding portion 18n-1 equal to (or substantially equal to) the sum of the period (electrical angle 360 °) and m times, and a winding portion 18n-2 wound around the rotor teeth 19 with a short-pitch winding. You can also. Similarly, in the rotor winding 18s, the inner width (α °) in the circumferential direction is the sum of the width (α0 °) of the rotor teeth 19 in the circumferential direction and m times the magnetomotive force fluctuation period (electrical angle 360 °). It is also possible to include an equal (or substantially equal) winding portion 18s-1 and a winding portion 18s-2 wound around the rotor teeth 19 with a short-pitch winding. The interval in the circumferential direction between the two slots 51 through which the winding portions 18n-1 and 18s-1 pass is equal to (or approximately equal to) (m + 0.5) times the fluctuation period of the magnetomotive force, and the winding portion in the circumferential direction. The inner widths of 18n-2 and 18s-2 are equal to (or substantially equal to) the width (α0 °) of the rotor teeth 19 in the circumferential direction. In the example shown in FIGS. 13 and 14, the inner width (α °) of the winding portions 18n-1 and 18s-1 in the circumferential direction is the width of the rotor teeth 19 in the circumferential direction (α0 °) and the magnetomotive force in the circumferential direction. Equal to (or substantially equal to) the sum of the fluctuation period (electrical angle 360 °). The interval in the circumferential direction between the two slots 51 through which the winding portions 18n-1 and 18s-1 pass is equal to (or substantially equal to) 1.5 times the magnetomotive force variation period (electrical angle 540 °). In this way, the rotor winding 18n with respect to the centrifugal force can be suppressed while suppressing the magnetic influence by expanding the winding width of a part of the rotor windings 18n and 18s in units of the magnetomotive force fluctuation period (electrical angle 360 °). , 18s can be improved.

  In the above description of the embodiment, the current flowing through the rotor windings 18n and 18s is rectified by the diodes 21n and 21s using the spatial harmonic component of the rotating magnetic field formed in the stator 12, so that the rotor teeth 19 are magnetized. It was made to function as a magnet with a fixed magnetic pole. However, in the present embodiment, the rotating electrical machine 10 may be a winding synchronous machine in which the diodes 21n and 21s are omitted. In that case, for example, by passing a direct current through the rotor windings 18n and 18s via a slip ring or the like, the rotor teeth 19 can be magnetized to function as a magnet with a fixed magnetic pole. In that case, magnets with different magnetic poles are formed in the rotor teeth 19 around which the rotor winding 18n is wound and the rotor teeth 19 around which the rotor winding 18s is wound so that the magnetization directions are opposite to each other. Next, the direction of the direct current flowing through the rotor windings 18n and 18s is determined.

  15 and 16 show an example in which the rotating electrical machine 10 is a vernier motor. In the example shown in FIG. 15, the magnetomotive force due to the alternating current flowing through the nine stator windings 28u, 28v, 28w has a fluctuation distribution for one period in the circumferential direction, and the magnetomotive force fluctuation period (electrical angle) in the circumferential direction. 360 °) is ½ of the entire circumference of the stator. The interval between the adjacent rotor teeth 19 in the circumferential direction (the interval between the slots 51) is equal to 1/8 of the magnetomotive force fluctuation period (electrical angle 360 °). The rotor windings 18n and 18s function as magnets in which the rotor teeth 19 are magnetized and the magnetic poles are fixed, for example, by passing a direct current through a slip ring or the like. In the example shown in FIG. 16, the inner width (α °) of the rotor windings 18n, 18s in the circumferential direction is the width of the rotor teeth 19 in the circumferential direction (α0 °) and the magnetomotive force fluctuation period (electrical angle 360 °). Is equal to the sum of Also in this example, the winding width of the rotor windings 18n and 18s is increased in units of the magnetomotive force fluctuation period (electrical angle 360 °), thereby suppressing the magnetic influence and the rotor windings 18n and 18s against the centrifugal force. Holding power can be improved.

  17 and 18 show an example in which the rotating electrical machine 10 is a wire-wound induction machine. In the examples shown in FIGS. 17 and 18, the fluctuation period (electrical angle 360 °) of the magnetomotive force of the stator 12 in the circumferential direction is 1/8 of the entire circumference of the stator, and the interval (slot) between the adjacent rotor teeth 19 in the circumferential direction. 51) is equal to 1/6 of the magnetomotive force fluctuation period (electrical angle 360 °). When the rotating magnetic field formed on the stator 12 is linked to a plurality of (for example, three-phase) rotor windings 18u, 18v, and 18w, an induced electromotive force is generated in each rotor winding 18u, 18v, and 18w, and an induced current is generated. Flowing. Each rotor winding 18u, 18v, 18w passes through two slots 51 whose circumferential interval is equal to (or approximately equal to) (m + 0.5) times the magnetomotive force fluctuation period (electrical angle 360 °). 19 is wound. In the example shown in FIGS. 17 and 18, the interval in the circumferential direction between the two slots 51 through which the rotor windings 18u, 18v, and 18w pass is equal to 1.5 times the magnetomotive force variation period (electrical angle 540 °) ( Or almost equal). As described above, the winding width of the rotor windings 18u, 18v, 18w is increased by the magnetomotive force fluctuation period (electrical angle 360 °) unit as compared with the case where the electrical angle is 180 ° (full-pitch winding). The holding power of the rotor windings 18u, 18v, 18w against the centrifugal force can be improved while suppressing the influence. Each rotor winding 18u, 18v, 18w is wound around the rotor teeth 19 through a slot 51 whose interval in the circumferential direction is equal to (m + 0.5) times the magnetomotive force fluctuation period (electrical angle 360 °). And winding portions wound around the rotor teeth 19 at an electrical angle of 180 ° (full-pitch winding), and the winding widths of some of the rotor windings 18u, 18v, 18w It can also be expanded in units of magnetomotive force fluctuation period (electrical angle 360 °).

  In the present embodiment, the shape of the rotor teeth 19 is not necessarily a straight shape having a constant cross-sectional area perpendicular to the radial direction. Further, the holding force of the rotor windings 18n and 18s against the centrifugal force can be further improved by providing the teeth ridge 19a at the tip of the rotor teeth 19 or providing the wedge 19b in the slot 51 between the rotor teeth 19. Can do.

  As mentioned above, although the form for implementing this invention was demonstrated, this invention is not limited to such embodiment at all, and it can implement with a various form in the range which does not deviate from the summary of this invention. Of course.

It is a figure which shows schematic structure of the rotary electric machine which concerns on embodiment of this invention. It is a figure which shows schematic structure of the rotary electric machine which concerns on embodiment of this invention. It is a figure which shows schematic structure of the rotary electric machine which concerns on embodiment of this invention. It is a figure which shows schematic structure of the rotary electric machine which concerns on embodiment of this invention. It is a figure which shows schematic structure of the rotary electric machine which concerns on embodiment of this invention. It is a figure which shows schematic structure of the rotary electric machine which concerns on embodiment of this invention. It is a figure which shows the structural example at the time of winding a rotor coil | winding to a rotor tooth by short-pitch winding. It is a figure which shows the structural example at the time of providing the tooth | gum umbrella in the front-end | tip part of rotor teeth. It is a figure which shows the structural example at the time of providing a wedge in the slot between rotor teeth. It is a figure explaining the force concerning a rotor coil | winding in the rotary electric machine which concerns on embodiment of this invention. It is a figure which shows the other schematic structure of the rotary electric machine which concerns on embodiment of this invention. It is a figure which shows the other schematic structure of the rotary electric machine which concerns on embodiment of this invention. It is a figure which shows the other schematic structure of the rotary electric machine which concerns on embodiment of this invention. It is a figure which shows the other schematic structure of the rotary electric machine which concerns on embodiment of this invention. It is a figure which shows the other schematic structure of the rotary electric machine which concerns on embodiment of this invention. It is a figure which shows the other schematic structure of the rotary electric machine which concerns on embodiment of this invention. It is a figure which shows the other schematic structure of the rotary electric machine which concerns on embodiment of this invention. It is a figure which shows the other schematic structure of the rotary electric machine which concerns on embodiment of this invention.

Explanation of symbols

  10 Rotating machine, 12 Stator, 14 Rotor, 16 Rotor core, 18n, 18s, 18u, 18v, 18w Rotor winding, 19 Rotor teeth, 21n, 21s Diode, 22 Rotating shaft, 26 Stator core, 28u, 28v, 28w Stator winding , 30 stator teeth, 31, 51 slots.

Claims (4)

A rotating electrical machine in which a stator and a rotor are arranged opposite to each other in a radial direction orthogonal to the rotor rotation axis,
The rotor includes a rotor core in which a plurality of rotor teeth protruding to the stator are formed at intervals in the circumferential direction around the rotor rotation axis, and a rotor winding wound around the rotor teeth through a slot between the rotor teeth. And having a line,
The stator has a stator core and a stator winding wound around the stator core, and a fluctuation period in the circumferential direction of the magnetomotive force generated by an alternating current flowing through the stator winding is 1 / of the entire circumference of the stator. n (n is an integer of 2 or more),
The rotor winding has a winding whose inner width in the circumferential direction is substantially equal to the sum of the width of the rotor teeth in the circumferential direction and m times the magnetomotive force fluctuation period (m is an integer of 1 or more that satisfies m <n). A rotating electrical machine that includes a wire section. The rotating electrical machine according to claim 1,
The stator forms a rotating magnetic field containing harmonic components by the alternating current flowing in the stator winding wound in a concentrated winding around the stator core,
In the rotor winding, an induced electromotive force is generated by the linkage of rotating magnetic fields including harmonic components formed by the stator,
The rotor further includes a rectifying element that rectifies a current flowing in the rotor winding in accordance with the generation of the induced electromotive force,
A rotor tooth is a rotating electrical machine that functions as a magnet with fixed magnetic poles by being magnetized according to the current rectified by the rectifying element flowing in the rotor winding. The rotating electrical machine according to claim 2,
The rotor windings wound around the rotor teeth adjacent in the circumferential direction are electrically separated from each other,
A rectifying element is provided for each electrically separated rotor winding,
Each rectifying element rectifies the current flowing in the rotor winding wound around the rotor teeth adjacent in the circumferential direction in a direction in which the magnetic poles of the adjacent rotor teeth are different from each other. A rotating electrical machine in which a stator and a rotor are arranged opposite to each other in a radial direction orthogonal to the rotor rotation axis,
The rotor includes a rotor core in which a plurality of rotor teeth protruding to the stator are formed at intervals in the circumferential direction around the rotor rotation axis, and a rotor winding wound around the rotor teeth through a slot between the rotor teeth. And having a line,
The stator has a stator core and a stator winding wound around the stator core, and a fluctuation period in the circumferential direction of the magnetomotive force generated by an alternating current flowing through the stator winding is 1 / of the entire circumference of the stator. n (n is an integer of 2 or more),
The rotor winding is wound around the rotor teeth through a slot whose interval in the circumferential direction is substantially equal to (m + 0.5) times the fluctuation period of the magnetomotive force (m is an integer of 1 or more that satisfies m <n). Rotating electric machine including the winding part.

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