JP2011091961A - Motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor with rotors arranged to face each other with a gap provided on both surface sides of a stator, which is of low cost, smaller than before, and light weight. <P>SOLUTION: In a novel motor 1a, a stator 4 is arranged between two rotors 3a and 3b pivoted on a motor shaft 2. Magnetic poles 32a-32c are so arranged as tripartitioned in radial direction at respective magnetic pole positions in circumferential direction of the plane facing the stator 4 of the rotors 3a and 3b. Two-phase coils 6u and 6wa are concentrically provided on at least one surface of the stator 4, and annular coils 6u, 6v, 6wa, and 6wb for excitation in each phase are distributed on both surfaces of the stator 4. Magnetic poles 42a, 42b, and 42c are so arranged as to deviate in circumferential direction, on the inner peripheral side and outer peripheral side of the coils 6u-6wb of each phase on both surfaces of the stator 4. A pair of magnetic poles excited in radial direction are formed on both surfaces of the stator 4 by energizing the coils 6u-6wb of each phase in the order of phase to rotate the rotors 3a and 3b. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a motor having a structure in which a gap is provided on both sides of a stator and rotors are arranged to face each other.

  Conventionally, a claw pole type motor has been proposed as an example of a motor in which a stator and a rotor are coaxially arranged (for example, Patent Document 1 (abstract, [claim 1], paragraphs [0002], [0003], [0003] 0053]-[0063], FIG.

  6 shows a stator structure of a claw pole type motor described in Patent Document 1. The stator 119 includes U, V, and W phase stator rings 131, 132, and 133, a U phase coil 134, and a V phase coil. And coils 135a and 135b and a W-phase coil 136. The stator rings 131, 132, 133 of each phase are arranged so as to overlap in the motor axial direction L.

  The U-phase stator ring 131 includes nine teeth 131b that are arranged at equal intervals in the circumferential direction and extend inward in the radial direction, and magnetic poles 131c that extend further inward in the radial direction from these teeth 131b. Similarly, the V-phase stator ring 132 includes nine teeth 132b extending radially inward, and magnetic poles 132c extending further radially inward from the teeth 132b. The W-phase stator ring 133 includes nine teeth 133b and a magnetic pole 133c extending further inward in the radial direction from the teeth 133b.

  Further, a rotor is provided inside the stator 119, and a plurality of permanent magnets as magnetic poles are arranged in the circumferential direction in the rotor.

  The coils 134, 135a, 135b, and 136 of each phase are sequentially switched and energized to rotate the rotor.

  Next, an axial gap motor is well known as a motor in which the stator and the rotor are arranged in a state of facing each other with a gap provided in the motor axial direction. In this axial gap motor, it is also well known that the rotor is disposed in a state of being opposed to each other by providing a gap in the motor axial direction on both sides of the stator. In this axial gap motor, in order to reduce the size and weight, and reduce motor loss, a gap is provided on both sides of the stator, the rotor is arranged oppositely, and the outer peripheral side is wound with an exciting coil around the stator. (See, for example, Patent Document 2 (claim 4, paragraphs [0010]-[0015], FIG. 1)).

  FIG. 7 shows an axial gap motor 200 described in Patent Document 2, wherein (a) is a plan view of the magnetic pole surface of the rotor 212a viewed from the stator 211, and (b) is along the line BB in (a). 2 is a cross-sectional view of a cut axial gap motor 200. FIG. The axial gap motor 200 includes a stator 211 and a pair of rotating rotors 212a and 212b arranged with a gap (gap) provided on both sides thereof. The rotors 212a and 212b are supported by a motor shaft 213.

  In the stator 211, a plurality of outer cores 215 around which coils 214 of each phase are wound are arranged at substantially equal intervals in the circumferential direction, and an inner core 216 around which coils 214 are wound is arranged inside each outer core 215. . That is, in the stator 211, the outer core 215 and the inner core 216 around which the coil 214 is wound are arranged concentrically in close proximity to the positions of the magnetic poles at substantially equal intervals in the circumferential direction. The coils 214 of the cores 215 and 216 at each position differ in electrical angle of energization by 180 degrees and are excited by, for example, U-phase + U (N pole) and -U (S pole) magnetic pole pairs.

  The rotors 212a and 212b include yokes 217a and 217b and a plurality of outer permanent magnets 218a and inner permanent magnets 218b that form magnetic poles, respectively, and are divided into approximately four equal parts by a partition 219 made of a non-magnetic member. Has four compartments isolated from each other. The permanent magnets 218a and 218b facing the stator 211 are arranged corresponding to the cores 215 and 216 of the stator 211, and have different polarities in the circumferential direction and the radial direction.

  Then, by sequentially energizing the coils 214 of each phase, for example, the magnetic path r of FIG. 7B and the magnetic path r2 of FIG. 212b rotates. At this time, the magnetic path r2 passing through the end surface orthogonal to the motor shaft 213 is shortened, and the motor loss is reduced.

JP 2005-20981 A JP 2007-236130 A

  In the case of the conventional motor having the stator structure shown in FIG. 6, the magnetic poles 131c, 132c, and 133c of the stator 119 extend radially inward from the teeth 131b, 132b, and 133b and secure a certain magnetic pole area. It bends in a letter shape and extends in the direction of the motor shaft L. Therefore, the length of each of the teeth 131b, 132b, 133b in the motor axis L direction is shorter than the length of the magnetic poles 131c, 132c, 133c in the motor axis L direction. In addition, the circumferential width of each of the teeth 131b, 132b, and 133b cannot be made very wide in order to prevent leakage of magnetic flux to the adjacent other-phase magnetic poles 132c, 133c, and 131c and the teeth 132b, 133b, and 131b. Therefore, the magnetic path cross-sectional areas of the teeth 131b, 132b, and 133b are smaller than the magnetic pole surface areas of the magnetic poles 131c, 132c, and 133c. As a result, magnetic saturation is likely to occur in each of the teeth 131b, 132b, 133b, and it is difficult to obtain a large motor output. Further, since each magnetic pole 131c, 132c, 133c extends in the direction of the motor axis L, the length of the magnetic pole 131c, 132c, 133c becomes longer in the axial direction, resulting in an increase in the size and mass of the motor. .

  In the case of the axial gap motor 200 of FIG. 7, since one stator 211 is shared by the two rotors 212a and 212b, it is smaller and lighter than when a stator is provided for each of the rotors 212a and 212b. However, coils 214 are wound around the outer core 215 and the inner core 216 at the positions of the magnetic poles of the stator 211, and the magnetic poles of the outer core 215 and the inner core 216 are equivalent to the thickness of these coils 214. The lengths of the outer peripheral side, between the magnetic poles, and the inner peripheral side are shortened to reduce the magnetic pole area. Therefore, sufficient motor output cannot be obtained. In addition, since the coil 214 is individually wound around the outer core 215 and the inner core 216 of each magnetic pole, the productivity is poor, and a large amount of coil wire is required, which increases the motor size and mass. Therefore, it is expensive and cannot be sufficiently reduced in size and weight.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a motor having a structure that is inexpensive and has an unprecedented small size and light weight in a motor having a structure in which a gap is provided on both sides of a stator and rotors are arranged to face each other.

  In order to achieve the above-described object, a motor according to the present invention includes a stator disposed between two rotors that are pivotally supported by a motor shaft, and each magnetic pole in a circumferential direction of a surface of the two rotors facing the stator. Arranged in a state where the magnetic poles of the salient pole structure are divided into three in the radial direction at positions, and two-phase coils are provided concentrically on at least one side, and an annular coil for exciting each phase on both sides of the stator Are arranged in a state in which the magnetic poles of the salient pole structure are shifted in the circumferential direction on the inner peripheral side and the outer peripheral side of the coils of the respective phases at the respective magnetic pole positions in the circumferential direction on both surfaces of the stator. By energizing the coils in the phase sequence, magnetic pole pairs in which the phases are excited are formed in the radial direction across the coils of the energized phase at each magnetic pole position on both surfaces of the stator. Item 1).

  The stator of the motor of the present invention is characterized in that a pair of magnetic poles excited in the same phase is formed on the radially inner peripheral side of both surfaces. (Claim 2).

  Furthermore, in the motor of the present invention, a recess is formed in which a portion protruding from the stator of the annular coil of each phase of the stator is rotatably inserted by a gap between the magnetic poles in the radial direction of the two rotors. (Claim 3).

  In the case of the motor of the present invention according to claim 1, the structure is an axial gap motor in which a gap is provided on both sides of the stator and the rotor is disposed oppositely, and the magnetic pole area of the salient pole structure in which the stator and both rotors face each other is large. It can be shortened in the motor axial direction, and two rotor / stator structures can be formed by using one stator, which can be further shortened in the motor axial direction. Further, for example, in the case of three-phase driving, the stator has a radial direction at each magnetic pole position in the circumferential direction of one side by energizing the annular coils for excitation of each phase concentrically arranged in the stator in the phase sequence. Further, two-phase magnetic pole pairs are formed in a lump for each phase, shifted in the circumferential direction, and at least the remaining one-phase magnetic pole pairs are formed in a lump in the same magnetic pole arrangement at each magnetic pole position in the circumferential direction on the other side. Also features a claw pole type motor.

  And by providing the feature of the axial gap motor which has arrange | positioned the rotor on the both surfaces side of a stator, the magnetic pole area which a stator and a rotor oppose can fully be enlarged, magnetic saturation does not arise easily, and it is easy to obtain a big motor output. In addition, the motor is shortened in the motor axial direction, the motor size and mass are reduced, and sufficient size and weight can be reduced.

  In addition, it has the characteristics of a claw pole type motor, and the magnetic pole pairs of each phase of the stator can be excited by one annular coil for each phase, so it is produced in comparison with the case where coils are individually wound for each magnetic pole. As a result, the required coil wire can be extremely reduced, the motor size and mass can be reduced, the motor can be formed at low cost, and sufficient size and weight can be reduced. In addition, since a coil is cyclic | annular, it is easy to manufacture also in that point, and productivity improves.

  Therefore, it has a structure in which a gap is provided on both sides of the stator and the rotors are arranged opposite to each other, and it is formed in a novel structure that has not been heretofore. A simple motor can be provided.

  In the case of the motor of the present invention according to claim 2, particularly in the case of three-phase driving, for example, one side of the stator is radially outer on the one side of the stator, and two phases U and W are radially outer on the other side. To form a two-phase magnetic pole pair of V and W, and form a magnetic pole pair excited in the same phase (W phase) on the radially inner peripheral side of both surfaces, so that the magnetic pole area on the inner peripheral side of both surfaces is the outer peripheral side There is an advantage that a smaller W-phase magnetic pole pair is formed on both sides of the stator, and the total number of crossing magnetic fluxes of the same coil as that of the U-phase and V-phase magnetic pole pairs on the outer peripheral side can be obtained.

  In the case of the motor according to the third aspect of the present invention, the protruding portions of the coils on both surfaces of the stator are rotatably inserted into the recesses formed by the gaps between the magnetic poles in the radial direction of both rotors. The length can be further shortened, and the motor can be further reduced in size. There is also an advantage that the leakage inductance is reduced and the generated torque is increased.

The motor of one Embodiment of this invention is shown, (a) is sectional drawing of a motor axial direction, (b) is a back view of a rotor. (A), (b) is a top view of both surfaces of an example of the stator of the motor of FIG. (A), (b) is explanatory drawing of an example of the magnetic path of the motor of FIG. 1, and another example. (A), (b) is a top view of both surfaces of the other example of the stator of the motor of FIG. 1, respectively. The motor of other embodiment of this invention is shown, (a) is sectional drawing of a motor axial direction, (b) is a back view of a rotor. It is a perspective view in the state where a part of stator of an example of the conventional motor was cut off. (A) is a top view of the magnetic pole surface of the rotor seen from the stator side of the other example of the conventional motor, (b) is sectional drawing of the motor which follows the BB line of (a).

  Next, in order to describe the present invention in more detail, embodiments will be described in detail with reference to FIGS.

(One embodiment)
An embodiment will be described with reference to FIGS.

  FIG. 1A is a cross-sectional view of a three-phase (phase-sequence U-phase, V-phase, W-phase) driving motor 1a of the present embodiment. The motor 1a is an output of a non-magnetic motor shaft 2 such as stainless steel. The rotor 3a, the stator 4 and the rotor 3b are sequentially arranged from the side (left side of the drawing) so as to face each other with a certain gap (gap).

(Configuration of rotors 3a and 3b)
The rotors 3a and 3b are the same as a rotor (reluctance rotor) of a so-called reluctance motor having the same shape, and each includes a disk-like (including a polygonal shape in plan view) rotor yoke 31.

  FIG. 1B is a rear view of the rotor 3a when viewed in the direction of the arrow line α in FIG. 1A, and the rotor yoke 31 is pivotally supported by the motor shaft 2 through the motor shaft 2 in the center. Yes. Further, on one surface (magnetic pole surface) of the rotor yoke 31 facing the stator 4, a plurality of magnetic poles 32a, 32b, 32c having a salient pole structure are provided at eight magnetic pole positions at substantially equal intervals in the circumferential direction (for example, 45 ° intervals). It is arranged in a state of being divided into three at substantially equal intervals in the radial direction. The magnetic poles 32a, 32b, and 32c are magnetic poles on the outer circumferential side, the middle, and the inner circumferential side in the radial direction of the stator yoke 31, and appropriate gaps are provided between the magnetic poles 32a, 32b, and 32c. The magnetic poles 32a, 32b, and 32c are formed of, for example, dust cores, and each magnetic pole position in the circumferential direction has a fan shape in the radial direction. Therefore, the magnetic pole 32a on the outer peripheral side has a fan shape that is horizontally long in plan view, and an intermediate magnetic pole 32b. Is substantially square in the plan view, and the magnetic pole 32c on the inner peripheral side (most closest to the motor shaft 2) has a vertically long fan shape in the plan view. The magnetic pole area of the magnetic pole 32a on the outer peripheral side is the largest, and the magnetic pole 32c on the inner peripheral side is Assuming that the area ratio is the smallest, the outer peripheral side and the intermediate magnetic poles 32a and 32b are 1, the inner peripheral magnetic pole 32c is approximately ½.

  Further, an annular coil for excitation of the stator 4 to be described later is rotatably fitted by an annular concave groove formed by a gap between the magnetic poles 32a and 32b and an annular concave groove formed by a gap between the magnetic poles 32b and 32c. A recess 5 is formed.

(Configuration of stator 4)
The stator 4 includes a disk-shaped stator yoke 41 having a loose insertion hole for the motor shaft 2 at the center, and both surfaces thereof face the magnetic pole surfaces of the rotors 3a and 3b.

  2 (a) and 2 (b) show magnetic pole surfaces 41a and 41b facing the rotors 3a and 3b of the stator yoke 41. The magnetic pole surfaces 41a and 41b correspond to the magnetic pole positions of the rotors 3a and 3b, respectively. For example, eight magnetic pole positions P are set at equal intervals in the direction. Further, these magnetic pole positions P are each divided into two in the circumferential direction, and the magnetic poles 42a, 42b, and 42c corresponding to the magnetic poles 32a, 32b, and 32c are described later. Be placed.

  Further, in the case of this embodiment, in order to form a magnetic pole pair excited in the W phase (in-phase) on the radially inner peripheral side of the magnetic pole surfaces 41a and 41b of the stator 4, two magnetic phases U and W are formed on the magnetic pole surface 41a. Excitation coils 6u and 6wa are provided concentrically in the radial direction, and V and W two-phase excitation coils 6v and 6wb are provided concentrically at the back surface of the coils 6u and 6wa on the magnetic pole surface 41b. Two coils 6u, 6v, 6wa and 6wb are provided on the magnetic pole surfaces 41a and 41b, respectively. Each of the coils 6u, 6v, 6wa, 6wb is concentric (including a polygon or a shape in which a part of the circumference is a straight line), and is covered with an insulating insulator depending on the case.

  The coils 6u and 6wa of the magnetic pole surface 41a are provided at positions facing the gaps between the magnetic poles 32a, 32b and 32c of the rotor 3a, and the portions protruding from the magnetic pole surface 41a are rotatably fitted in the two recesses 5 of the rotor 3a. Is done. The coils 6v and 6wb of the magnetic pole surface 41b are provided at positions facing the gaps between the magnetic poles 32a, 32b and 32c of the rotor 3b, and the portions protruding from the magnetic pole surface 41b are rotatably fitted in the two recesses 5 of the rotor 3b. The By doing so, the motor 1a is further reduced in length in the direction of the motor shaft 2 and further reduced in size, and the leakage inductance is reduced and the torque is increased.

  By the way, when the magnetic pole pair excited in the W phase is formed only on the radially inner peripheral side of one of the magnetic pole surfaces 41a and 41b, for example, the coil 6wb on the magnetic pole surface 4b is omitted.

  Next, at each magnetic pole position P of the magnetic pole surface 41a divided by the broken line in FIG. 2A, the magnetic poles 42a, 42b, 42c having a salient pole structure are formed in the three-regions in the radial direction divided by the coils 6u, 6wa. The positions are shifted so that the respective center lines in the radial direction are shifted in the circumferential direction. Specifically, the magnetic poles 42a and 42b having the same magnetic pole area are arranged at one division position P1 of each magnetic pole position P, and the magnetic pole 42b and the magnetic pole 42c having a half magnetic pole area are arranged at the other division position P2. . Since the magnetic poles 42b at the divided positions P1 and P2 are integrally coupled, at each magnetic pole position P, the magnetic pole 42a is disposed on the right side of the horizontally elongated magnetic pole 42b in the coupled circumferential direction, and the magnetic pole 42c is on the left side of the paper. Will be placed. At this time, the magnetic pole area of the intermediate coupled magnetic pole 42b is the largest, the magnetic pole area of the outer peripheral magnetic pole 42a is half of that, and the magnetic pole area of the inner peripheral magnetic pole 42c is 1/4 of the magnetic pole 42b of the combined magnetic pole 42b. It becomes an area.

  Similarly, also in each magnetic pole position P of the magnetic pole surface 41b divided by the broken line in FIG. 2B, the magnetic poles 42a, 42b, 42c having the salient pole structure are divided into three regions in the radial direction divided by the coils 6u, 6wa. However, each radial center line is arranged so as to be shifted in the circumferential direction. Specifically, the magnetic poles 42a and 42b having the same magnetic pole area are arranged at one division position P1 of each magnetic pole position P, and the magnetic pole 42b and the magnetic pole 42c having a half magnetic pole area are arranged at the other division position P2. . At this time, since the magnetic poles 42b at the divided positions P1 and P2 are integrally coupled, at each magnetic pole position P, the magnetic pole 42a is arranged on the left side of the horizontally elongated magnetic pole 42b in the coupled circumferential direction, and on the right side of the paper. The magnetic pole 42c is arranged, the magnetic pole area of the combined magnetic pole 42b is the largest, the magnetic pole area of the magnetic pole 42a on the outer peripheral side is half that, and the magnetic pole area of the magnetic pole 42c on the inner peripheral side is the same as that of the combined magnetic pole 42b. The magnetic pole area is 1/4.

  In FIG. 1, the magnetic pole surface 41a side of the stator 4 shows a cross section cut along the β-β line in FIG. 2 (a), and the magnetic pole surface 41b side is cut along the γ-γ line in FIG. 2 (b). A cross section is shown.

  The motor 1a is supplied with power by switching the three-phase driving current to the coils 6u, 6v, 6w of the respective phases in phase order. At this time, the coils 6u and 6v of the magnetic pole surfaces 41a and 41b are the second and largest (first) of the magnetic poles 42a, 42b and 42c whose magnetic pole positions P are adjacent to each other in the radial direction. Therefore, the U-phase and V-phase drive currents are fed independently in the reverse direction or the same direction. Also, the coils 6wa and 6wb of the magnetic pole surfaces 41a and 41b are connected in series so that the current does not increase because the adjacent magnetic poles 42c in the radial direction have the smallest magnetic pole area at each magnetic pole position P. A W-phase drive current is fed in the same direction and the magnetic poles on both sides are used, so that the total number of crossed magnetic fluxes of the coils is substantially the same as that of the other phases.

  At this time, the magnetic poles 42a and 42b at the magnetic pole positions P of the magnetic pole surfaces 41a adjacent in the radial direction across the coil 6u are, for example, U having the magnetic pole 42a as the N pole (U +) and the magnetic pole 42b as the S pole (U−). The magnetic pole pair of the phase is configured. The magnetic poles 42a and 42b at each magnetic pole position P of the magnetic pole surface 41b adjacent in the radial direction across the coil 6v are, for example, V-phase magnetic poles having the magnetic pole 42a as the S pole (V−) and the magnetic pole 42b as the N pole (V +). Configure a pair. Further, the magnetic poles 42b and 42c at the magnetic pole positions P of the magnetic pole faces 41a and 41b adjacent in the radial direction across the coils 6wa and 6wb are, for example, the magnetic pole 42b as an N pole (W +) and the magnetic pole 42c as an S pole (W−). ) And the opposite W-phase magnetic pole pair. The total number of crossing magnetic fluxes of the coils of each phase is substantially the same.

  FIG. 3A shows the magnetic path of each phase when the magnetic poles 42b and 42c at the magnetic pole positions P of the magnetic pole faces 41a and 41b are excited by currents in opposite directions by broken line arrows. The W-phase magnetic paths 41a and 41b are formed independently in the reverse direction.

  FIG. 3B shows the magnetic path of each phase when the magnetic poles 42b and 42c at the magnetic pole positions P of the magnetic pole faces 41a and 41b are excited by the current in the same direction by broken line arrows. The W-phase magnetic paths 41a and 41b form a common magnetic path in the same direction.

  3A and 3B, the U phase of the magnetic pole surface 41a of the magnetic pole pair of the stator 4 based on the switching of the energized phase, the V phase of the magnetic pole surface 41b, and the magnetic pole surfaces 41a and 41b. By sequentially switching the W phase, the rotors 3a, 3b are brought into magnetic contact by the magnetic poles 32a, 32b, 32c of the magnetic pole surface 31 of the rotors 3a, 3b and the magnetic pole pairs of the respective phases of the magnetic pole surfaces 41a, 41b of the stator 4. Torque is generated and rotated like a reluctance rotor, and the motor 1a is driven with the minimum number of phases (three phases) capable of generating stable four-quadrant torque. At this time, since the rotor yoke 41 disperses the magnetic flux also in the radial direction and the circumferential direction, the motor 1a can be made thinner and lighter.

  In the case of FIG. 3A, since the magnetic path does not penetrate the stator yoke 41, the outer peripheral portion and the inner peripheral portion that do not affect the magnetic path of the stator yoke 41 are thinned into concave grooves to further reduce the weight. Can be achieved. In the case of FIG. 3B, since the magnetic path penetrates the stator yoke 41, the portion of the stator yoke 41 in the vicinity of the coils Wa and Wb where the magnetic flux density is low is cut and thinned to further reduce the weight. be able to.

  The motor 1a has a structure of an axial gap motor in which gaps are provided on both sides of the stator 4 and the rotors 3a and 3b are arranged opposite to each other. The magnetic pole area of the salient pole structure in which the stator 4 and the rotors 3a and 3b are opposed to each other is large. Further, it can be shortened in the direction of the motor shaft 2, and the structure of two sets of rotors / stators can be formed by using one stator 4, and can be further shortened in the direction of the motor shaft 2. Furthermore, in the three-phase drive by energizing the annular coils 6u, 6v, 6wa, 6wb for exciting each phase concentrically arranged in the stator 4 in the three-phase drive, the stator 4 has at least a magnetic pole surface (single surface). ) Two-phase U and W magnetic pole pairs are formed collectively for each phase at the respective magnetic pole positions P in the circumferential direction of 41a and shifted in the radial direction and circumferential direction, and each magnetic pole position P on the magnetic pole surface (the other side) 41b is formed. With the same magnetic pole arrangement, the remaining one-phase V and W-phase magnetic pole pairs are formed in a lump and also have the characteristics of a claw pole motor.

  By providing the feature of the axial gap motor in which the rotors 3a and 3b are disposed on both sides of the stator 4, the opposing magnetic pole areas of the stator 4 and the rotors 3a and 3b can be sufficiently increased. It is difficult to generate and it is easy to obtain a large motor output. In addition, the motor is shortened in the direction of the motor shaft 2 and the motor size and mass are reduced, so that the motor 1a can be sufficiently reduced in size and weight.

  The motor 1a has a feature of a claw pole type motor, and each of the annular coils 6u, 6v, 6wa, 6wb of the stator 4 has a plurality of one-phase magnetic poles 42a, 42b, 42c on the magnetic pole surfaces 41a, 41b. Can be excited at once. Therefore, (i) the number of coils for exciting the magnetic poles is reduced and the productivity is improved. (Ii) The total coil peripheral length of each of the coils 6u, 6v, 6wa, 6wb is shorter than that of each of the magnetic poles 42a, 42b, 42c wound individually. Therefore, the amount of coil wire (enameled wire) used is reduced, the coils 6u, 6v, 6wa and 6wb are light and inexpensive, and the motor 1a is inexpensive, small and light. (Iii) Since each coil 6u, 6v, 6wa, 6wb is annular, there is also an advantage that it is easy to manufacture. (Iv) By sharing the stator yoke 41 for the stator yokes of the two rotors 3a and 3b, the stator 4 can be reduced in weight as compared with the case where the stator is arranged for each of the rotors 3a and 3b. (V) Since each coil 6u, 6v, 6wa, 6wb is accommodated in one slot and arranged in the stator 4, there is an advantage that the insulation reliability is improved.

  Furthermore, the outer circumference and inner circumference of the stator yoke 41 can be cut into a concave groove shape to further reduce the weight of the stator 4. Further, the portion of the stator yoke 41 in the vicinity of the coils Wa and Wb where the magnetic flux density is low can be cut and thinned to reduce the weight of the stator 4. In addition, you may fill resin into the part which carried out the meat removal etc.

  Therefore, a gap is provided on both sides of the stator 4 so that the rotors 3a and 3b are opposed to each other, and the rotor 4 is formed in a new structure that has not been obtained in the past. The revolutionary motor 1a can be provided.

  Further, a W-phase magnetic pole pair having a small magnetic pole area on the inner peripheral side of each of the magnetic pole surfaces 41a and 41b of the stator 4 is formed on both the magnetic pole surfaces 41a and 41b and connected in series, so There is an advantage that the total number of crossing magnetic fluxes of the same coil as that of the U-phase and V-phase magnetic pole pairs on the outer peripheral side of the magnetic pole surfaces 41a and 41b can be obtained without increasing.

  By the way, in each magnetic pole position P of the magnetic pole surfaces 41a and 41b of the stator 4, the divided magnetic pole positions P1 and P2 may be set with a gap.

  4A and 4B show magnetic pole surfaces 41a and 41b when the divided magnetic pole positions P1 and P2 are set with a gap, and in this case, at each magnetic pole position P of the magnetic pole faces 41a and 41b, 2 Since the two magnetic poles 42b are arranged in a separated state, the magnetic pole area ratio of the magnetic pole 42a, the two magnetic poles 42b, and the magnetic pole 42c is 1 when the magnetic pole 42a is 1, and the magnetic pole 42b is 1 and the magnetic pole 42c is 1/2. .

  In this case, the same effect as that obtained when the divided magnetic pole positions P1 and P2 are set closely without providing a gap can be obtained.

(Other embodiments)
Another embodiment will be described with reference to FIG.

  FIG. 5A shows a cross section in the direction of the motor shaft 2 of the three-phase (phase-sequence U phase, V phase, W phase) motor 1b of the present embodiment, and FIG. 5B is a diagram of FIG. The magnetization state by the permanent magnet of the magnetic pole surface of the rotor 3a when viewed in the direction of the arrow line ε is shown. In these drawings, the same reference numerals as those in FIGS. 1 to 4 denote the same or corresponding elements.

  The motor 1b of the present embodiment is different from the motor 1a of the embodiment in that the rotors 3c and 3d are first arranged on both magnetic pole surfaces 41a and 41b side of the stator 4 in place of the rotors 3a and 3b of the motor 1a. This is the point that was placed.

  In the rotors 3c and 3d, instead of the magnetic poles 32a, 32b and 32c having the salient pole structure in the radial direction at the respective magnetic pole positions in the circumferential direction of the rotors 3a and 3b, the magnetic poles 32d, 32e and 32f of the permanent magnet having the salient pole structure are arranged. Is done. At this time, the polarities of the magnetic poles 32d, 32e, and 32f only need to be opposite to each other (the ones adjacent to each other in the radial direction are different from each other). Is set. In addition, thin auxiliary magnets 33a and 33b magnetized in the radial direction are provided in the gaps between the magnetic poles 32d, 32e, and 32f. Their polarities are set to the same polarities as the magnetic pole surfaces of the magnetic poles 32d, 32e, and 32f with which the auxiliary magnets 33a and 33b are in contact.

  The positions of the surfaces of the auxiliary magnets 33a and 33b are recessed from the magnetic pole surfaces of the magnetic poles 32d, 32e and 32f, and the coils 6u, 6v, 6wa and 6wb are arranged concentrically on the magnetic pole surfaces 41a and 41b of the stator 4. The protruding portion is inserted into the respective recesses 5 of the rotors 3c and 3d so as to be freely rotatable.

  Next, the excitation directions of the magnetic pole pairs of the respective phases by energization of the coils 6u, 6v, 6wa, 6wb are opposite to each other in the coils 6u, 6v on the outer peripheral side of the magnetic pole surfaces 41a, 41b and the coils 6wa, 6wb on the inner peripheral side. The magnetic pole pairs in the radial direction of the magnetic pole faces 41a and 41b are set so as to be opposite in polarity to the magnetic poles in the radial direction of the rotors 3c and 3d to form a magnetic path. Specifically, as shown in FIG. 5A, when viewed from the left side of the paper, the coils 6u and 6v are energized counterclockwise, and the coils 6wa and 6wb are energized clockwise, and the outer U phase and V phase are energized. Is excited to the S pole on the outer peripheral side and the N pole on the inner peripheral side, and the W phase on the inner peripheral side is excited to the N pole on the outer peripheral side and the S pole on the inner peripheral side.

  The motor 1b configured as described above has an increased amount of magnetic flux compared to the motor 1a due to the magnetic flux of the permanent magnets 32d, 32e, and 32f of the rotors 3c and 3d and the magnetic flux of the auxiliary magnets 33a and 33b. Thus, the amount of torque can be increased, and the height of the magnetic poles 32d, 32e, 32f of the rotors 3c, 3d and the rotor yoke 31 can be made thinner than those of the rotors 3a, 3b to further reduce the size of the motor 1b.

  The motor 1b having a permanent magnet structure can be driven by a normal three-phase inverter by connecting a coil to a neutral point, and the IPM motor of the existing permanent magnet embedded motor (IPM motor) drive system. Can be used instead, and there is also an advantage that contributes to the cost reduction of this type of drive system.

  The present invention is not limited to both the above-described embodiments, and various modifications other than those described above can be made without departing from the spirit thereof. For example, the motor 1a of both the above-described embodiments can be made. 1b, the W-phase coil of the stator 4 is, for example, only the coil 6wa of the magnetic pole surface 41a, the U-phase and W-phase two-phase magnetic pole pairs are formed on the magnetic pole surface 41a, and the V-phase is formed on the magnetic pole surface 41b. A (one-phase) magnetic pole pair may be formed. Of course, the W-phase coil of the stator 4 may be only the coil 6wb of the magnetic pole surface 41b.

  The motors 1a and 1b may be A-phase, B-phase, C-phase, and D-phase four-phase drive motors. In this case, for example, the coils 6u and 6wa of the magnetic pole surface 41a are connected to the A-phase and C-phase. The excitation coils and the coils 6v and 6wb on the magnetic pole surface 41b may be B-phase and D-phase excitation coils.

  Further, in the motors 1a and 1b, the positions of the magnetic poles in the circumferential direction of the rotors 3a to 3d and the stator 4 are not limited to eight, but can be appropriately adjusted such that three, five, and sixteen motors 1a and 1b can rotate. Any number may be used.

  Finally, the motor of the present invention is formed by arranging a plurality of sets of rotors 3a, 3b or rotors 3c, 3d facing each other with gaps on both sides of the stator 4 in the direction of the motor shaft 2. May be.

  And the motor of this invention is applicable to various uses, such as a drive motor of an electric vehicle or a hybrid car.

1a, 1b Motor 2 Motor shaft 3a-3d Rotor 4 Stator 5 Recess 6u, 6v, 6wa, 6wb Coil 31, 41a, 41b Magnetic pole surface 32a-32f, 42a-42c Magnetic pole

Claims (3)

A stator is disposed between two rotors supported by the motor shaft,
The magnetic poles of the salient pole structure are arranged in a state of being radially divided into three at respective magnetic pole positions in the circumferential direction of the surfaces of the two rotors facing the stator,
An annular coil for excitation of each phase is dispersedly arranged on both surfaces of the stator so that two-phase coils are provided concentrically on at least one side,
Arranged in a state where the magnetic poles of the salient pole structure are shifted in the circumferential direction on the inner peripheral side and outer peripheral side of the coils of each phase at the respective magnetic pole positions in the circumferential direction on both surfaces of the stator,
By energizing the coils of each phase in the phase sequence, magnetic pole pairs in which the phases are excited are formed in the radial direction across the coils of the energized phase at each magnetic pole position on both surfaces of the stator. Motor. The motor according to claim 1,
The motor is characterized in that the stator has a pair of magnetic poles excited in the same phase on the radially inner peripheral side of both surfaces. The motor according to claim 1 or 2,
The motor is characterized in that a concave portion in which a portion protruding from the stator of the annular coil of each phase of the stator is rotatably inserted is formed by a gap between the magnetic poles in the radial direction of the two rotors.

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