Magnetic gear

Abstract

In a magnetic gear part (5) in which a multi-pole mechanism (4), a few-pole mechanism (2), and a pole piece (3) share the function of any one of a stator, a first rotor, and a second rotor, the positional relationship of magnetic poles is different between adjacent segments (5a, 5b, 5c) among a plurality of segments divided in the axial direction such that at least one of the multi-pole mechanism (4), the few-pole mechanism (2), and the pole piece (3) has a phase difference (theta). And at least one of the maximum common divisor of the number of poles of the multi-pole mechanism (4) and the pole piece (3) and the maximum common divisor of the number of poles of the few-pole mechanism (2) and the pole piece (3) is 1 or 2.

Description

Technical Field

[0001] The present application relates to a magnetic gear. Background Art

[0002] A general rotating motor composed of permanent magnets and soft magnetic materials has a decrease in torque and a decrease in efficiency due to an increase in iron loss because the induced voltage increases as the speed increases and the input voltage that can be used for torque output decreases. Therefore, in order to obtain the desired output and efficiency characteristics, a drive unit structure composed of a rotating motor and a gear is generally adopted to keep the speed of the rotating motor within an appropriate range.

[0003] As the gears to be used, mechanical gears, which are meshing structures of mechanical gears, are widely used. However, in recent years, the use of magnetic gears that can perform non-contact power transmission instead of mechanical gears has been increasing. The old magnetic gears are structures in which the teeth of the mechanical gears are simply replaced with permanent magnets, but they can achieve non-contact acceleration and deceleration using the attraction and repulsion of magnetic forces, so vibration and noise are small, and it is expected that the maintainability will be improved.

[0004] However, in the transmission of torque using permanent magnets, the structure that contributes to the transmission of torque is only the magnets facing each other, so the torque is small compared to mechanical gears. In contrast, a new type of magnetic gear called a flux modulation type magnetic gear is adopted, and the magnetic gear of this new type is constructed to increase the magnetic flux that contributes to the transmission of torque in the structure to increase the torque. The flux modulation type magnetic gear is composed of a multi-pole mechanism and a few-pole mechanism and a plurality of magnetic pole pieces made of soft magnetic materials, etc., which are called pole pieces. The multi-pole mechanism and the few-pole mechanism are configured with permanent magnets in a manner that the polarities are alternately opposite and are concentrically configured in a manner that the configuration surfaces are separated by a gap and face each other, and the magnetic pole pieces are arranged at equal intervals in the gap.

[0005] The flux modulation type magnetic gear can improve the transmission torque. On the other hand, since the soft magnetic body is periodically arranged at a position extremely close to the permanent magnet, periodic vibration caused by electromagnetic excitation force or cogging torque is generated due to the same principle as the rotating motor. Therefore, there are concerns about electromagnetic noise caused by vibrating the stator and frame of the rotating motor, adverse effects on the load of the connected object due to the vibration transmitted to the output shaft, and deterioration of controllability. In contrast, the following structure is proposed: a structure is set to continuously deflect the permanent magnets of the rotor of the magnetic gear in the axial direction, and the cogging torque generated in each axial section of the magnetic gear is offset by a phase relationship (for example, refer to patent document 1.).

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: International Publication No. 2015 / 053005 (Paragraphs 0020 to 0033, Figure 1 to Figure 4 ) Summary of the invention

[0009] Problems to be solved by the invention

[0010] However, the structure that continuously deflects the permanent magnet in the axial direction requires special manufacturing equipment for making the permanent magnet into a special shape and combining it with the rotor core during manufacturing, so there is a problem of increased manufacturing cost. On the other hand, in order to reduce the cogging torque without adopting a deflected structure, a method of adopting a pole number structure of the magnetic gear that increases the order of the cogging torque can be considered. However, it is necessary to increase the least common multiple of the number of pole pieces of the magnetic gear and the number of permanent magnets of the multi-pole mechanism while setting a practical gear ratio. In such a structure, there is a problem of increasing the electromagnetic noise caused by the electromagnetic excitation force due to the reduction in the order.

[0011] The present application has been made to solve the above-mentioned problems, and an object of the present application is to obtain a flux modulation type magnetic gear that can simultaneously achieve a reduction in cogging torque and a reduction in electromagnetic excitation force without increasing manufacturing costs.

[0012] Solutions to Solve Problems

[0013] The magnetic gear disclosed in the present application is characterized in that it comprises: a magnetic gear portion, which is configured to have: a multi-pole mechanism in which magnetic poles of a first number of poles formed by permanent magnets are arranged along the circumferential direction; a few-pole mechanism in which magnetic poles of a second number of poles less than the first number of poles formed by permanent magnets are arranged along the circumferential direction; and pole pieces in which magnetic poles of a third number of poles formed by soft magnetic bodies are arranged along the circumferential direction via magnetic gaps with respect to the magnetic poles of the multi-pole mechanism and the magnetic poles of the few-pole mechanism, respectively, and each of which shares the function of a stator, a first rotor, and a second rotor; a first shaft that is responsible for torque transmission between the first rotor and the outside; and a second shaft that is responsible for torque transmission between the second rotor and the outside, in which, in the magnetic gear portion, the positional relationship of the magnetic poles between the multi-pole mechanism, the few-pole mechanism, and the pole piece is different between adjacent sections among a plurality of sections divided along the axial direction, so that at least one of the multi-pole mechanism, the few-pole mechanism, and the pole piece has a phase difference, and at least one of the greatest common divisor of the first number of poles and the third number of poles and the greatest common divisor of the second number of poles and the third number of poles is 1 or 2.

[0014] Effects of the Invention

[0015] According to the magnetic gear disclosed in the present application, it is possible to obtain a magnetic flux modulation type magnetic gear that can achieve both reduction of cogging torque and reduction of electromagnetic excitation force without increasing manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a cross-sectional view along the rotation axis, showing the structure of the magnetic gear according to the first embodiment.

[0017] Figure 2A and Figure 2B Each of the first section and the second section of the two-stage magnetic gear portion constituting the magnetic gear of the first embodiment is a cross-sectional view perpendicular to the rotation axis.

[0018] Figure 3A and Figure 3B These are diagrams showing the relationship between the electromagnetic excitation force X component and the electromagnetic excitation force Y component with respect to the rotation angle based on the multipolar mechanism in the magnetic gear portion of the magnetic gear according to the first embodiment.

[0019] Figure 4 This is a vector diagram of the electromagnetic excitation force generated by the multi-pole mechanism in the first section and the second section of the magnetic gear in the first embodiment.

[0020] Figure 5A and Figure 5B 1 and 2. A cross-sectional view perpendicular to the rotation axis of the second section of the magnetic gear according to the modification of the first embodiment and a vector diagram of the electromagnetic excitation force generated in the multi-pole mechanism, respectively.

[0021] Fig. 6A and Figure 6B The diagrams respectively show the relationship between the circumferential position of the multipolar mechanism of the magnetic gear and the primary component of the electromagnetic excitation force in the modified example of the first embodiment and the relationship between the phase difference between two sections and the amplitude of the primary component of the electromagnetic excitation force of the entire magnetic gear part.

[0022] Figure 7 It is a cross-sectional view along the rotation axis, showing the structure of the magnetic gear according to the second embodiment.

[0023] Figure 8 This is a cross-sectional view perpendicular to the rotation axis of the second section of the magnetic gear according to the second embodiment.

[0024] Fig.9A and Fig. 9B These are diagrams showing the relationship between the electromagnetic excitation force X component and the electromagnetic excitation force Y component with respect to the rotation angle based on the multipolar mechanism in the magnetic gear portion of the magnetic gear according to the second embodiment.

[0025] Fig.10 It is a cross-sectional view along the rotation axis showing the structure of the magnetic gear according to the third embodiment.

[0026] Fig.11 It is a cross-sectional view along the rotation axis showing the structure of the magnetic gear according to the fourth embodiment.

[0027] Fig.12 It is a cross-sectional view along the rotation axis showing the structure of the magnetic gear according to the fifth embodiment.

[0028] Fig.13 It is a cross-sectional view along the rotation axis showing the structure of the magnetic gear according to the sixth embodiment.

[0029] Fig.14A and Fig. 14B Each of the first section and the second section of the two-stage magnetic gear portion constituting the magnetic gear of the sixth embodiment is a cross-sectional view perpendicular to the rotation axis.

[0030] Fig.15 This is a diagram showing the relationship between the circumferential position in the magnetic gap between the multi-pole mechanism and the pole pieces of the magnetic gear according to the sixth embodiment and the secondary component of the electromagnetic excitation force.

[0031] Fig.16A and Fig. 16B They are respectively a diagram showing the relationship between the circumferential position in the magnetic gap between the multi-pole mechanism and the pole pieces of the magnetic gear of the modified example of embodiment 6 and the secondary component of the electromagnetic excitation force and a diagram showing the relationship between the phase difference between two sections and the amplitude of the secondary component of the electromagnetic excitation force.

[0032] Fig.17 It is a cross-sectional view along the rotation axis showing the structure of the magnetic gear according to the seventh embodiment.

[0033] Fig.18A and Fig.18B Each of the first segment and the second segment of the two-stage magnetic gear portion constituting the magnetic gear of the seventh embodiment is a cross-sectional view perpendicular to the rotation axis. DETAILED DESCRIPTION

[0034] Implementation Method 1

[0035] Figure 1 to Figure 4 is a diagram for explaining the structure and operation of the magnetic gear of Embodiment 1. Figure 1 is a cross-sectional view along the rotation axis including the rotation axis, showing the structure of the magnetic gear. Figure 2A The first section of the magnetic gear part has two sections with different specifications in the axial direction. Figure 1 The cross-sectional view perpendicular to the rotation axis corresponds to the A-A line. Figure 2B is the second segment and Figure 1 The cross-sectional view perpendicular to the rotation axis corresponds to the B-B line. Figure 1 In order to emphasize the portion made of magnetic material that generates the gear action of the magnetic gear portion, other elements are drawn with hatching omitted although they are cross-sections, and sectional views along the rotation axis are drawn similarly thereafter.

[0036] and, Figure 3A : is a diagram showing the relationship between the electromagnetic excitation force X component (PU unit) of the first segment, the second segment and the entire gear portion and the rotation angle in electrical angle based on the multi-pole mechanism in the magnetic gear portion. Figure 3B : is a diagram showing the relationship between the electromagnetic excitation force Y component (PU unit) of the first segment, the second segment and the entire gear portion and the rotation angle in electrical angle based on the multi-pole mechanism in the magnetic gear portion. Figure 4 It is a vector diagram of the electromagnetic excitation force generated by the multi-pole mechanism in the first section and the second section.

[0037] The magnetic gear of the present application including the first embodiment is a flux modulation type magnetic gear having two rotors and one stator, which correspond to any one of a multi-pole mechanism, a few-pole mechanism and a pole piece. Specifically, Figure 1 As shown, an example is described in which a few-pole mechanism 2 as a first rotor is concentrically arranged on one side close to the rotation axis X, a multi-pole mechanism 4 as a second rotor is concentrically arranged outside the first rotor with a gap, and a pole piece 3 as a stator is concentrically arranged in the gap to form a magnetic gear part 5.

[0038] In the magnetic gear unit 5, between the first section 5a and the second section 5b, the multi-pole mechanism 4, the few-pole mechanism 2, and the pole piece 3 are mechanically connected in the direction of the rotation axis X (axial direction). On the other hand, the configuration of the three mechanisms (multi-pole mechanism 4, few-pole mechanism 2, pole piece 3) in the first section 5a and the configuration of the three mechanisms in the second section 5b are set so that the phase relationship of at least one mechanism relative to one of the three mechanisms is different between the first section 5a and the second section 5b. As a result, the magnetic gear unit 5 forms a segmented deflection between the first section 5a and the second section 5b, but the detailed structure including the circumferential configuration of the multi-pole mechanism 4, the few-pole mechanism 2, and the pole piece 3 will be described later.

[0039] The rotors (multi-pole mechanism 4 and few-pole mechanism 2) of the magnetic gear 1 are supported by a plurality of bearings 9, respectively. The portion (hatched line) made of magnetic material that generates the gear action is protected by a bracket 8b and a frame 8f, which are made of structural members such as iron and non-magnetic bodies. Through these structures, the driving force generated by the rotating motor (not shown) connected to the few-pole rotor shaft 6 on one end side along the rotation axis X (axial direction) or the multi-pole rotor shaft 7 on the other end side is reduced in speed and torque-increased or increased in speed and torque-decreased through the magnetic gear portion 5, and is transmitted from the shaft on the opposite side.

[0040] <Magnetic gear unit>

[0041] Using the cross section perpendicular to the rotation axis X of the first segment 5a, Figure 2A, the basic structure of the magnetic gear unit 5 is described. The magnetic gear 1 is formed by arranging a multi-pole mechanism 4 having permanent magnets, a few-pole mechanism 2 having a smaller number of poles than the multi-pole mechanism 4, and a pole piece 3 made of a soft magnetic material arranged via a magnetic gap relative to the multi-pole mechanism 4 and the few-pole mechanism 2 in a concentric circle shape. The permanent magnets 4m and 2m serving as magnetic poles are magnetized in the radial direction, and are arranged in the same manner as a rotating electric machine so that the polarities of the permanent magnets adjacent to each other in the circumferential direction are reversed (N, S, N, S, ...: arrows in the figure).

[0042] The number of permanent magnets 2m in the few-pole mechanism 2 (number of poles Np2) is 6, the number of permanent magnets 4m in the multi-pole mechanism 4 (number of poles Np4) is 28, and the pole piece 3 is composed of 17 pole pieces (number of poles Np3 = 17). That is, the gear ratio of the magnetic gear portion 5 in the magnetic gear 1 of the first embodiment is (28 / 2) / (6 / 2) = 4.67, and the rotational force of the few-pole rotor shaft 6 is reduced to 1 / 4.67 times and the torque is increased to 4.67 times and output to the multi-pole rotor shaft 7.

[0043] The greatest common divisor of the number of poles Np2 in the few-pole mechanism 2 and the number of poles Np3 in the pole piece 3 and the greatest common divisor of the number of poles Np4 in the multi-pole mechanism 4 and the number of poles Np3 in the pole piece 3 are both 1. Thus, the number of cogging torques in the few-pole mechanism 2 or the pole piece 3, which is determined by the least common multiple of the number of poles Np2 in the few-pole mechanism 2 and the number of poles Np3 in the pole piece 3, can be increased. Furthermore, the number of cogging torques in the multi-pole mechanism 4 or the pole piece 3, which is determined by the least common multiple of the number of poles Np4 in the multi-pole mechanism 4 and the number of poles Np3 in the pole piece 3, can also be increased.

[0044] It is known that the cogging torque generally has a smaller amplitude as the order increases, and therefore, by adopting such a pole number (pole number Np2, pole number Np3, pole number Np4) structure, the cogging torque generated in the magnetic gear 1 can be reduced. As a result, the torque pulsation of the input shaft and the output shaft of the magnetic gear 1 can be suppressed, and the controllability of the rotating motor and the load connected to the magnetic gear 1 can be improved.

[0045] On the other hand, since the greatest common divisor is 1, the symmetry in space is 1 cycle (space order 1) in mechanical angle, and the electromagnetic excitation force of space order 1 is generated in the multi-pole mechanism 4, the few-pole mechanism 2 and the pole piece 3 respectively. The electromagnetic excitation force of space order 1 becomes a factor of increasing noise vibration because it makes the bearing 9 or the frame 8f vibrate at a low period, but it can be reduced by connecting multiple segments (first segment 5a and second segment 5b) with different phases in the axial direction to form the magnetic gear part 5. The details of this will be described later.

[0046] In addition, since the segments with different phases are connected in the axial direction, the surfaces of the permanent magnets 2m and 4m used in the segments (the first segment 5a and the second segment 5b) extending in the axial direction are all parallel to the axial direction, and the shape is simplified (in this embodiment, it is a tile shape). Therefore, unlike the case of forming a continuous deflection, mass production is easy and the manufacturing cost can be reduced.

[0047] Next, the difference in configuration (phase) between the first segment 5a and the second segment 5b will be described. Figure 2A The line segment La is defined by the reference position in the circumferential direction of the first segment 5a. The line segment La indicates that the multi-pole mechanism 4, the few-pole mechanism 2, and the pole piece 3 in the first segment 5a become Figure 2A The direction of an arbitrary position in the circumferential direction at the moment of the positional relationship (phase relationship) shown. In this figure, for convenience, the upper direction of the figure is defined as line segment La.

[0048] The first section 5a becomes Figure 2A The configuration shown is the configuration of the multi-pole mechanism 4, the few-pole mechanism 2, and the pole piece 3 in the second section 5b at the same time. Figure 2B As shown. The second segment 5b is a structure obtained by reversing the configuration of the first segment 5a by 180° to the line segment Lb based on the line segment La. When the phases of the multipole mechanism 4, the few-pole mechanism 2 and the pole piece 3 are compared with the first segment 5a, the phase of the multipole mechanism 4 is consistent and has the same configuration. In contrast, the few-pole mechanism 2 and the pole piece 3 are structures with different cross-sectional shapes due to different phases. In other words, the multipole mechanism 4 forms a segmented deflection between the first segment 5a and the second segment 5b.

[0049] The mechanism having the same phase as the first section 5a does not need to be stacked in the axial direction with a phase shift, and can be shared with the first section 5a. Therefore, a manufacturing device for stacking with a phase shift is not required, and an increase in manufacturing cost can be suppressed. This effect is usually obtained by arranging two or more sections with different phases in at least one of the pole piece 3, the few-pole mechanism 2, and the multi-pole mechanism 4 in the axial direction.

[0050] Next, the operation and characteristics of the magnetic gear 1 having the two-stage magnetic gear portion 5 are described. The X component and the Y component of the electromagnetic excitation force generated by the multipolar mechanism 4 in each of the first segment 5a and the second segment 5b of the magnetic gear portion 5 constituting the magnetic gear 1 of the first embodiment are shown in FIG. Figure 3A and Figure 3B It is known that when the multi-pole mechanism 4 rotates one cycle (360°) in electrical angle based on the magnetic pole, there are components vibrating with the same cycle in the X-axis direction and the Y-axis direction.

[0051] That is, as described above, it can be seen that the electromagnetic excitation force of one cycle (spatial order 1) in mechanical angle is generated in the first segment 5a and the second segment 5b respectively with respect to the circumferential direction of the multipolar mechanism 4. Since the first segment 5a and the second segment 5b are in a relationship of a rotation of 180° mechanical angle, the phase of the electromagnetic excitation force of spatial order 1 is also rotated by 180°, and as shown in the figure, the phase is reversed in each of the X component and the Y component. As a result, it can be seen that the value obtained by adding the electromagnetic excitation force of the first segment 5a and the second segment 5b, that is, the electromagnetic excitation force of the entire magnetic gear part 5 is almost not generated.

[0052] Figure 3A , Figure 3B If the relationship between the X component and the Y component at a rotation angle of 120° is represented by a vector diagram, then Figure 4 As shown. Figure 4 In FIG. 1 , the solid line and the dotted line represent the trajectory of the vector of the first segment 5a and the second segment 5b, respectively. The vector of the electromagnetic excitation force at the rotation angle of 120° becomes a relationship of 180° reversed between the first segment 5a and the second segment 5b. Therefore, if the addition is performed (magnetic gear part 5), it is approximately 0, and it can be seen that the electromagnetic excitation force is offset by the electromagnetic force of the same magnitude and vector reversed and is not generated.

[0053] The vectors of the electromagnetic excitation force of the first segment 5a and the second segment 5b rotate along the trajectory while maintaining a phase relationship of 180°. Therefore, it can be seen that the suppression effect of the electromagnetic excitation force is maintained during one rotation of one electrical angle cycle. That is, the suppression effect of the electromagnetic excitation force is also maintained during one rotation of one mechanical angle cycle (in this embodiment, the number of poles Np4 is 28, which corresponds to 14 electrical angle cycles).

[0054] According to the above-mentioned pole number relationship, a structure can be realized that suppresses the electromagnetic excitation force while suppressing the cogging torque, and can simultaneously achieve improved controllability of the rotating motor and load connected to the magnetic gear 1 and reduced vibration and noise caused by the electromagnetic excitation force of the magnetic gear 1.

[0055] Modifications

[0056] Figure 5A The second section of the magnetic gear of the modified example of the first embodiment is Figure 2B The corresponding cross-sectional view perpendicular to the rotation axis is: Figure 5B It is the vector diagram of the electromagnetic excitation force generated by the multi-pole mechanism. Fig. 6A This is a diagram showing the relationship between the circumferential position of the multi-pole mechanism of the magnetic gear and the primary component of the electromagnetic excitation force. Figure 6B This is a diagram showing the relationship between the phase difference (phase deviation) between two sections and the amplitude of the primary component of the electromagnetic excitation force of the entire magnetic gear portion.

[0057] In this variation, the configuration is the same as that described in the first embodiment except that the configuration in the second segment is different. Figure 2A The configuration described in . Figure 5A As shown, the second segment 5b of the magnetic gear 1 of the modified example is a structure obtained by rotating the first segment 5a with the line segment La as the reference to the line segment Lb by a phase difference of θ. That is, when θ=180°, the second segment 5b is different from the first segment 5a described in the embodiment 1. Figure 2B Corresponding to the configuration shown, in this modification, a structure in which the rotation angle is generalized is shown.

[0058] like Figure 5B As shown, the electromagnetic excitation force vector relationship is a relationship in which the first segment 5a and the second segment 5b have a phase difference θ. It is also known that the electromagnetic excitation force of the entire magnetic gear unit 5 represented by the added vector varies according to the phase difference between the first segment 5a and the second segment 5b.

[0059] Fig. 6A The relationship between the distribution of electromagnetic force at the circumferential position of the multipole mechanism 4 and the first-order component of the electromagnetic excitation force represented by the addition of vectors is shown. As can be seen from the description of the vector diagram, the amplitude of the waveform (5: dotted line) representing the addition of the first-order components of the electromagnetic excitation force varies according to the phase difference between the first segment 5a and the second segment 5b.

[0060] The waveform obtained by adding the first segment 5a and the second segment 5b when the phase of the second segment 5b is shifted relative to the first segment 5a by a phase difference θ based on a mechanical angle, that is, the relationship between the amplitude of the first component of the electromagnetic excitation force of the entire magnetic gear part 5 and the phase difference θ is as follows: Figure 6B As shown. If the phase difference θ is within the range of greater than 120° and less than 240°, the amplitude of the first component of the electromagnetic excitation force can be made smaller than the amplitude generated by the first segment 5a and the second segment 5b alone. In other words, the effect of a magnetic gear 1 with low noise can be obtained compared with a case where a magnetic gear portion is composed of a single segment.

[0061] Other variations

[0062] In the first embodiment and its modified examples (the above examples), an example is shown in which the phase of the multipole mechanism 4 is consistent in the cross section rotated by 180° between the first section 5a and the second section 5b, but the present invention is not limited to this. For example, when the phase of the few-pole mechanism 2 or the pole piece 3 is consistent by rotating by 180°, the process of stacking the mechanisms of the second section 5b part with the phase shifted relative to the configuration of the first section 5a part can be reduced, and the same effect of reducing the manufacturing cost can be obtained.

[0063] In addition, in the above examples, an example in which the pole piece 3 is fixed is shown, but it is also possible to have a structure in which the pole piece 3 is freely rotatable and the phase can be arbitrarily adjusted. In addition, it is also possible to have a structure in which the multi-pole mechanism 4 or the few-pole mechanism 2 is fixed. In addition, in the above examples, an example in which two types of segments (the first segment 5a, the second segment 5b) are connected in the axial direction is shown, but the same effect can be obtained by adopting a structure in which more types of segments are combined and the electromagnetic excitation force is offset by the addition of vectors.

[0064] Implementation Method 2

[0065] In the second embodiment, the arrangement of the mechanisms in the second section is changed compared to the first embodiment. Figure 7 , Figure 8 as well as Fig.9A and Fig. 9B is a diagram for explaining the structure and operation of the magnetic gear of Embodiment 2. Figure 8 is a cross-sectional view along the rotation axis including the rotation axis, showing the structure of the magnetic gear. Figure 8 is with Figure 7 A cross-sectional view of the second section corresponding to the CC line perpendicular to the rotation axis. Fig.9A is a diagram showing the relationship between the electromagnetic excitation force X component of the first segment, the second segment and the entire gear portion and the rotation angle in electrical angle based on the multi-pole mechanism in the magnetic gear portion, Fig. 9B This is a diagram showing the relationship between the electromagnetic excitation force Y component of the first segment, the second segment, and the entire gear portion and the rotation angle in electrical angle based on the multi-pole mechanism in the magnetic gear portion.

[0066] The magnetic gear 1 of the second embodiment is the same as the first embodiment except that the arrangement structure of the mechanism in the second section 5b described in the first embodiment is replaced. Figure 2A The second segment 5b is arranged to have a phase leading the first segment 5a in the time course so as to have a phase relationship that can be canceled out by addition of the primary component of the electromagnetic excitation force of the first segment 5a.

[0067] like Figure 7 , Figure 8 As shown, the second section 5b becomes relative to Figure 2AThe configuration when the multipole mechanism 4 is rotated 30° in the electrical angle with the multipole mechanism 4 as the reference with respect to the first segment 5a described in the above. The direction in which the multipole mechanism 4 rotates from the line segment La after the time of rotating 30° in the electrical angle with the multipole mechanism 4 as the reference has passed is set as Lb4, and the direction in which the few-pole mechanism 2 rotates from the line segment La is set as line segment Lb2. Thus, at the moment of rotating 30° in the electrical angle with respect to the multipole mechanism 4 as the reference with respect to the line segment La in the first segment 5a, the multipole mechanism 4 rotates to the position of the line segment Lb4, and the few-pole mechanism 2 rotates to the position of the line segment Lb4.

[0068] Specifically, if Figure 8 As shown, the multi-pole mechanism 4 and the few-pole mechanism 2 are rotated to the positions of the line segment Lb4 and the line segment Lb2 respectively, with the line segment La of the first segment 5a as the reference. Then, as shown in FIG. Fig.9A , Fig. 9B As shown, the X component and Y component of the electromagnetic excitation force of the first segment 5a and the second segment 5b are offset and become smaller than the electromagnetic excitation force of a single segment. In this way, even if a structure is adopted in which the second segment 5b having a configuration obtained by rotating the configuration in the first segment 5a during the passage of time is connected in the axial direction, the same effect as that of the first embodiment can be obtained.

[0069] Modifications

[0070] In Embodiment 2, an example is shown in which the phase of the pole piece 3 is consistent between the first segment 5a and the second segment 5b due to the fixed pole piece 3, but it can be seen that the same effect can be obtained when the multi-pole mechanism 4 or the few-pole mechanism 2 is fixed and the other two mechanisms are freely rotating.

[0071] In addition, Figure 8 In the embodiment, the second section 5b is configured to have a configuration relative to the configuration of the first section 5a and a configuration at a time when the multi-pole mechanism 4 is rotated by 30 degrees in electrical angle, but it is not limited to this. It can be seen that even if the second section 5b is configured to have a configuration at a time when the vibration caused by the electromagnetic excitation force is rotated by another electrical angle, the same effect can be obtained.

[0072] For example, the configuration of each mechanism in the second section 5b at this time is set to the configuration at the time of rotating α° (0≤α≤360) relative to the first section 5a in the electrical angle with the multipole mechanism 4 as the reference. That is, the direction in which the multipole mechanism 4 rotates from the line segment La after the time of rotating α° in the electrical angle with the multipole mechanism 4 as the reference is Lb4, and the direction in which the few-pole mechanism 2 rotates from the line segment La is set to the line segment Lb2. Thus, at the time of rotating α° in the electrical angle with the multipole mechanism 4 as the reference and with the line segment La in the first section 5a as the reference, it can be configured so that the multipole mechanism 4 rotates to the position of the line segment Lb4, and the few-pole mechanism 2 rotates to the position of the line segment Lb4.

[0073] In addition, in Embodiment 2 including the modified example, an example in which the pole piece 3 is fixed is shown, but it is also possible to have a structure in which the pole piece 3 is freely rotatable and the phase can be arbitrarily adjusted. In addition, it is also possible to have a structure in which the multi-pole mechanism 4 or the few-pole mechanism 2 is fixed. In addition, in Embodiment 2, an example in which two types of segments (the first segment 5a and the second segment 5b) are connected in the axial direction is shown, but the same effect can be obtained by adopting a structure in which more types of segments are combined to cancel the electromagnetic excitation force by adding vectors.

[0074] Implementation 3

[0075] In the first and second embodiments, an example of a magnetic gear portion having a two-stage structure in which a first segment and a second segment are connected in the axial direction is described. In the third embodiment, an example of a magnetic gear portion having a three-stage structure is described. Fig.10 : This is a cross-sectional view along the rotating shaft including the rotating shaft of the magnetic gear for explaining the structure and operation of the magnetic gear of the third embodiment. In addition, the third magnetic gear portion is set to the same configuration (same phase) as the first section, and the first section and the second section are the same as the configuration described in the first embodiment or the second embodiment, and the description is omitted, and the reference is made to Figure 2A to Figure 9B .

[0076] In the magnetic gear 1 of the third embodiment, as exemplified in the first embodiment or the second embodiment, the first segment 5a and the second segment 5b having a different phase from at least one of the few-pole mechanism 2, the many-pole mechanism 4 and the pole piece 3 are adjacent to each other in the axial direction. Fig.10 As shown, a three-stage structure is provided in which a third segment 5c in which each mechanism is arranged in the same phase as the first segment 5a is connected to the second segment 5b on the opposite side of the first segment 5a in the axial direction.

[0077] In Embodiment 1 or Embodiment 2, there is one adjacent portion of segments with different phases, while in this embodiment, the difference is that there are two adjacent portions of segments with different phases, and the structure other than this is the same as that of Embodiment 1 or Embodiment 2. By arranging the segments with different phases (the first segment 5a, the second segment 5b, and the third segment 5c) dispersedly in the axial direction, it is possible to suppress the deflection in the direction perpendicular to the axial direction caused by the bending moment generated by the combination of electromagnetic excitation forces with different phases in the circumferential direction.

[0078] Regarding the axial area distribution of the segments with different phase configurations, the structure that achieves the best deflection suppression effect varies depending on the positional relationship between the rotor and the bearing 9 or the fastening position with the load and the rotating electrical machine. Fig.10 In the figure, as an example, a structure is shown in which the ratio of the axial stacking thickness of the first segment 5a, the second segment 5b, and the third segment 5c reaches 1:2:1. From the viewpoint of canceling the electromagnetic excitation force, it is preferred that the axial stacking thickness of the configuration pattern A formed by the first segment 5a and the third segment 5c is consistent with the axial stacking thickness of the configuration pattern B formed by the second segment 5b.

[0079] In the third embodiment, an example is shown in which three segments are connected in the axial direction to form the magnetic gear part 5, but when the number is set to 4 or more, the deflection in the direction perpendicular to the axial direction can be further reduced, and the same effect can be obtained. In addition, in the third embodiment, an example is shown in which two types of segments are connected in the axial direction to form the magnetic gear part 5, but the same effect can be obtained by adopting a structure in which more types of segments are combined to cancel the electromagnetic excitation force by adding vectors.

[0080] Implementation 4

[0081] In the first and second embodiments, the first and second segments are connected in close contact in the axial direction to form a magnetic gear unit. In the fourth embodiment, the first and second segments are connected via a magnetic gap to form a magnetic gear unit. Fig.11 1 is a cross-sectional view along the rotating shaft including the rotating shaft of the magnetic gear for explaining the structure and operation of the magnetic gear of the fourth embodiment. In addition, the configuration of the mechanism of each of the first section and the second section is the same as the configuration described in the first embodiment or the second embodiment, and the description is omitted, and the reference is made to Figure 2A to Figure 9B .

[0082] like Fig.11As shown, the magnetic gear 1 of the fourth embodiment is the same as the first embodiment or the second embodiment except that a magnetic gap portion 5g is provided between the first segment 5a and the second segment 5b in the axial direction via air or a non-magnetic body. By providing the magnetic gap portion 5g between the first segment 5a and the second segment 5b of different phases, it is possible to reduce the leakage magnetic flux in the axial direction that does not contribute to the torque transmission of the magnetic gear 1. Therefore, it is possible to suppress the reduction of the transmission torque caused by connecting the segments of different phases (the first segment 5a and the second segment 5b) to form the magnetic gear portion 5.

[0083] Modifications

[0084] exist Fig.10 In the example of providing a small magnetic gap 5g in the axial direction in order to suppress the volume of the magnetic gear 1, the present invention is not limited to this. Even if the axial distance between the first segment 5a and the second segment 5b is further and they are connected by structural members to ensure the magnetic gap 5g, the same effect can be obtained. In addition, a structure can be adopted in which the first segment 5a and the second segment 5b are set as segments composed of different structural members and each rotor (in this example, the multi-pole mechanism 4 and the few-pole mechanism 2) is connected by structural members.

[0085] Implementation method 5

[0086] The fifth embodiment is a configuration in which magnetic gaps are provided between the segments as in the fourth embodiment, in contrast to the magnetic gear portion in which three segments are connected as described in the third embodiment. Fig.12 1 is a cross-sectional view along the rotating shaft of the magnetic gear for explaining the structure and operation of the magnetic gear of the fifth embodiment. In addition, the configuration of the mechanism of each of the first segment, the second segment, and the third segment is the same as that described in the third embodiment, and the description thereof is omitted, and reference is made to Figure 2A to Figure 9B .

[0087] like Fig.12 As shown, the magnetic gear 1 of the fifth embodiment is the same as the third embodiment except that a magnetic gap portion 5g is provided between each of the first segment 5a, the second segment 5b, and the third segment 5c in the axial direction through air or a non-magnetic body. By distributing the first segment 5a, the second segment 5b, and the third segment 5c with different phases in the axial direction, the deflection in the vertical direction of the axial direction is suppressed. In addition, by providing the magnetic gap portion 5g between each segment, the leakage magnetic flux in the axial direction that does not contribute to the torque transmission of the magnetic gear 1 can be reduced.

[0088] Modifications

[0089] exist Fig.12In the example of providing a small magnetic gap 5g in the axial direction in order to suppress the volume of the magnetic gear 1, the present invention is not limited to this. Even if the axial distance between the first segment 5a, the second segment 5b and the third segment 5c is further apart and the magnetic gap 5g is ensured by connecting them with structural members, the same effect can be obtained.

[0090] In addition, a structure may be adopted in which the first segment 5a, the second segment 5b, and the third segment 5c are segments composed of different structural components and the respective rotors (in this example, the multi-pole mechanism 4 and the few-pole mechanism 2) are connected by the structural components. In addition, as in the third embodiment, an example is shown in which segments of two configuration patterns are connected in the axial direction, but the same effect can be obtained by adopting a structure in which more types of segments are combined and the electromagnetic excitation force is offset by the addition of vectors.

[0091] Implementation 6

[0092] In the magnetic gear of the sixth embodiment, an example in which the magnetic gear portion is configured with a combination of polarity numbers different from those in the first to fifth embodiments will be described. Figure 13 to Figure 15 is a diagram for explaining the structure and operation of the magnetic gear of Embodiment 6. Fig.13 is a cross-sectional view along the rotation axis including the rotation axis, showing the structure of the magnetic gear. Fig.14A is with Fig.13 A cross-sectional view perpendicular to the rotation axis of the first section corresponding to the line D-D of Fig. 14B is with Fig.13 A cross-sectional view of the second section corresponding to the EE line perpendicular to the rotation axis. Fig.15 This is a diagram showing the relationship between the primary component of the electromagnetic excitation force of the first segment, the second segment, and the entire gear portion and the circumferential position in the magnetic gap between the multi-pole mechanism and the pole pieces in the magnetic gear portion.

[0093] like Fig.13 and Fig.14A As shown, the magnetic gear 1 of the sixth embodiment is composed of a multi-pole mechanism 4 with 22 (pole number Np4) permanent magnets 4m, a few-pole mechanism 2 with 6 (pole number Np2) permanent magnets 2m, and a pole piece 3 composed of 14 (pole number Np3) magnetic pole pieces.

[0094] That is, the gear ratio of the magnetic gear 1 when the pole piece 3 is fixed is (22 / 2) / (6 / 2)=3.67. The greatest common divisor of the number of poles Np2 of the few-pole mechanism 2 and the number of poles Np3 of the pole piece 3 and the greatest common divisor of the number of poles Np4 of the multi-pole mechanism 4 and the number of poles Np3 of the pole piece 3 are both 2. By making the greatest common divisor of the number of poles 2, the least common multiple of the number of poles can be sufficiently increased as in the first embodiment, and the amplitude of the cogging torque can be reduced.

[0095] like Fig. 14B As shown, the second segment 5b is a shape obtained by rotating the first segment 5a by 90° mechanical angle with respect to the line segment La. Figure 2A The configuration shown is replaced by Fig.14A The configuration shown, the second section 5b from Figure 2B The configuration shown is replaced by Fig. 14B Except for the configuration shown, the above-mentioned embodiments 1 to 5 are the same.

[0096] In the pole number structure shown in the sixth embodiment, the spatial symmetry is quadratic, so an electromagnetic excitation force having a spatial quadratic mode in the circumferential direction is generated. The spatial waveform of the secondary component of the electromagnetic excitation force generated in the multipole mechanism 4 is as follows: Fig.15 As shown, it can be seen that since the first segment 5a and the second segment 5b have a phase difference of 90° in mechanical angle, the secondary components of the electromagnetic excitation force are canceled out when added due to the phase relationship.

[0097] Modifications

[0098] Fig.16A 1 is a diagram showing the relationship between the circumferential position in the magnetic gap between the multi-pole mechanism and the pole pieces of the magnetic gear and the secondary component of the electromagnetic excitation force according to the modified example of the sixth embodiment. Fig. 16B This is a diagram showing the relationship between the phase difference (phase deviation) between two sections and the amplitude of the secondary component of the electromagnetic excitation force of the entire magnetic gear portion.

[0099] In this modification, the following description will be given of the fact that the same effect can be obtained even when the mechanical angle phase difference is other than 90°. Fig. 14B The angle of the line segment Lb relative to the line segment La is replaced from 90° to θ. That is, when θ=90°, the same as that described in Embodiment 6 Fig. 14B Corresponding to the configuration shown, in this modification, a structure in which the rotation angle is generalized is shown.

[0100] like Fig.16AAs shown in FIG. 1 , it can be seen that even when the phase difference θ is not 90°, the amplitude of the spatial secondary component of the electromagnetic excitation force can be reduced by adding them together compared to the amplitude when each segment is used alone. The amplitude of the spatial secondary component of the electromagnetic excitation force when the phase difference θ is changed from 0° to 360° is shown in FIG. Fig. 16B When the phase difference θ is in the range of greater than 60° and less than 120° and greater than 240° and less than 300°, the amplitude of the spatial secondary component of the electromagnetic excitation force can be reduced compared to the case where each segment is used alone.

[0101] Other variations

[0102] In the sixth embodiment and its modified example, the pole piece 3 is fixed, but the pole piece 3 may be freely rotated and the phase may be adjusted arbitrarily. Figure 1 The two types of segments are shown as examples in which they are closely connected in the axial direction, but the present invention is not limited to this. Even if the structures according to the third to fifth embodiments are adopted, the same effects can be obtained.

[0103] Implementation 7

[0104] In the magnetic gear of the seventh embodiment, an example in which the magnetic gear portion is configured with a combination of polarity numbers different from those in the first to fifth and sixth embodiments will be described. Fig.17 as well as Fig.18A , Fig.18B is a diagram for explaining the structure and operation of the magnetic gear of Embodiment 7. Fig.17 is a cross-sectional view along the rotation axis including the rotation axis, showing the structure of the magnetic gear. Fig.18A is with Fig.17 A cross-sectional view perpendicular to the rotation axis of the first section corresponding to the F-F line, Fig.18B is with Fig.17 A cross-sectional view of the second segment corresponding to the GG line and perpendicular to the rotation axis.

[0105] like Fig.17 and Fig.18A As shown, the magnetic gear 1 of the sixth embodiment is composed of a multi-pole mechanism 4 with 20 (pole number Np4) permanent magnets 4m, a few-pole mechanism 2 with 8 (pole number Np2) permanent magnets 2m, and a pole piece 3 composed of 14 (pole number Np3) magnetic pole pieces.

[0106] That is, the gear ratio of the magnetic gear 1 when the pole piece 3 is fixed is (20 / 2) / (8 / 2)=2.5. The greatest common divisor of the number of poles Np2 of the few-pole mechanism 2 and the number of poles Np3 of the pole piece 3 and the greatest common divisor of the number of poles Np4 of the multi-pole mechanism 4 and the number of poles Np3 of the pole piece 3 are both 2. By making the greatest common divisor of the number of poles 2, the least common multiple of the number of poles can be fully increased as in the sixth embodiment, and the amplitude of the cogging torque can be reduced.

[0107] like Fig.18B As shown, the second segment 5b is a shape obtained by rotating the first segment 5a by 90° mechanical angle with respect to the line segment La. Figure 2A The configuration shown is replaced by Fig.18A The configuration shown, the second section 5b from Figure 2B The configuration shown is replaced by Fig.18B Except for the configuration shown, the above-mentioned embodiments 1 to 5 are the same.

[0108] The phase of the few-pole mechanism 2 of the second section is consistent with that of the first section 5a, and similarly to the first embodiment, it is not necessary to stack the few-pole mechanism 2 in the axial direction by staggering the phase. Therefore, it can be shared with the first section 5a, and therefore, it is not necessary to use manufacturing equipment for stacking by staggering the phase, and it is possible to suppress the increase in manufacturing costs. In the present embodiment, an example is shown in which the phase of the few-pole mechanism 2 is consistent between the first section 5a and the second section 5b, but it is not limited to this. The same effect can be obtained by configuring a configuration mode in which the phases of at least one of the few-pole mechanism 2 and the multi-pole mechanism 4 are different, and configuring a combination of more than two poles and a phase difference θ in the axial direction.

[0109] In the pole number structure shown in the sixth embodiment, the spatial symmetry is quadratic, so an electromagnetic excitation force having a spatial quadratic mode in the circumferential direction is generated. The spatial waveform of the secondary component of the electromagnetic excitation force generated in the multipole mechanism 4 is as follows: Fig.15 As shown, it can be seen that since the first segment 5a and the second segment 5b have a phase difference of 90° in mechanical angle, the secondary components of the electromagnetic excitation force are canceled out when added due to the phase relationship.

[0110] Modifications

[0111] In the seventh embodiment, the pole piece 3 is fixed, but the pole piece 3 may be freely rotated and the phase may be adjusted arbitrarily. Figure 1 The two types of segments shown are examples in which they are closely connected in the axial direction, but the present invention is not limited to this. Even if the structures according to the third to fifth embodiments are adopted, the same effects can be obtained.

[0112] This application describes various illustrative embodiments, but the various features, methods, and functions described in one or more embodiments are not limited to the application of specific embodiments, and can be applied to the embodiments alone or in various combinations. Therefore, countless unillustrated variations can be envisioned within the technical scope disclosed in the specification of this application. For example, it includes the case where at least one constituent element is deformed, added, or omitted, and it also includes the case where at least one constituent element is extracted and combined with constituent elements of other embodiments.

[0113] For example, an example is shown in which the permanent magnets (permanent magnet 4m, permanent magnet 2m) of each magnetic pole of the magnetic gear 1 are one per pole, but the same effect can be obtained when the permanent magnets are divided in the magnetization direction, the magnetization orthogonal direction, the axial direction, and other directions. In addition, an example is shown in which the magnetic gear 1 is a radial type having a magnetic gap in a direction orthogonal to the rotation axis X, but the same effect can be obtained in an axial type having a magnetic gap in a direction parallel to the rotation axis X.

[0114] In addition, in the above-mentioned embodiments, as the combination of the number of poles Np2, the number of poles Np4, and the number of poles Np3, a total of three combinations of the number of poles are shown, namely, a combination example of 6, 28, and 17, a combination example of 6, 22, and 14, and a combination example of 8, 20, and 14, but the present invention is not limited thereto. Furthermore, the greatest common divisor of the number of poles Np2 and the number of poles Np3 and the greatest common divisor of the number of poles Np4 and the number of poles Np3 are both 1 or 2, but the present invention is not limited thereto.

[0115] Of course, if both are 1, the spatial primary component of the electromagnetic excitation force can be minimized, and if both are 2, the spatial secondary component of the electromagnetic excitation force can be minimized. However, even if one is 1 and the other is 2, the spatial primary component and spatial secondary component of the electromagnetic excitation force can be reduced respectively. And, if one is 1 or 2, even if the other is neither 1 nor 2, the spatial primary component or spatial secondary component of the electromagnetic excitation force can be reduced.

[0116] Based on this, the same effect can be obtained as long as the structure satisfies at least the following three conditions simultaneously.

[0117] Condition 1: At least two segments with different phases of at least one of the pole piece 3, the few-pole mechanism 2, and the multi-pole mechanism 4 are arranged in the axial direction. Condition 2: At least one of the greatest common divisor of the number of poles Np2 of the few-pole mechanism 2 and the number of poles Np3 of the pole piece 3 and the greatest common divisor of the number of poles Np4 of the multi-pole mechanism 4 and the number of poles Np3 is 1 or 2. Condition 3: When the number of pole pairs (=Np2 / 2) of the few-pole mechanism 2 constituting the segment is set to N2, the number of pole pairs (=Np4 / 2) of the multi-pole mechanism 4 is set to N4, and the number of pole pieces 3 (=Np3) is set to N3, the relationship shown in formula (1) holds.

[0118] (2k-1)N3=N4±(2m-1)N2 (1)

[0119] Wherein, k and m are both natural numbers.

[0120] In addition, the shapes of the teeth, pole pieces 3, and permanent magnets (permanent magnets 2m and 4m) of the magnetic gear 1 are all shown in the simplest shape, but are not limited to this. The shapes of the teeth and pole pieces may be set to be widened or narrowed in the radial direction toward the magnetic gap. Moreover, even when bonded magnets are used as permanent magnets, two or more permanent magnets are used per magnetic pole and embedded in a V shape, as long as the above three conditions are met, the same effect can be obtained regardless of the shapes of the teeth, pole pieces 3, and permanent magnets.

[0121] As described above, according to the magnetic gear 1 of the present application, it comprises: a magnetic gear part 5, which is constructed to have: a multi-pole mechanism 4 with a first pole number (pole number Np4) formed by permanent magnets 4m and arranged along the circumferential direction; a few-pole mechanism 2 with a second pole number (pole number Np2) less than the first pole number (pole number Np4) formed by permanent magnets 2m and arranged along the circumferential direction; and pole pieces 3 with a third pole number (pole number Np3) formed by soft magnetic bodies and arranged along the circumferential direction via magnetic gaps relative to the poles of the multi-pole mechanism 4 and the poles of the few-pole mechanism 2, respectively, and each of which shares the function of a stator, a first rotor, and a second rotor; a first shaft (multi-pole rotor shaft 7), which is responsible for the torque transmission between the first rotor (for example, the multi-pole mechanism 4) and the outside; and a second shaft (few-pole rotor shaft 6), which is responsible for the torque transmission between the second rotor (for example, the few-pole mechanism 2) and the outside, and the magnetic gear part 5 is configured such that the positional relationship of the magnetic poles between the multi-pole mechanism 4, the few-pole mechanism 2 and the pole piece 3 is different between the adjacent sections (for example, the first section 5a, the second section 5b, the third section 5c) in the plurality of sections (for example, the first section 5a, the second section 5b, the third section 5c) divided along the axial direction (rotation axis X direction), so that at least one of the multi-pole mechanism 4, the few-pole mechanism 2 and the pole piece 3 has a phase difference θ, and at least one of the greatest common divisor of the first pole number (pole number Np4) and the third pole number (pole number Np3) and the greatest common divisor of the second pole number (pole number Np2) and the third pole number (pole number Np3) is 1 or 2. Thus, it is possible to simultaneously achieve the reduction of the cogging torque and the reduction of the electromagnetic excitation force without increasing the manufacturing cost.

[0122] In particular, if the surfaces of the permanent magnets (permanent magnets 4m and 2m) used in the multi-pole mechanism 4 and the few-pole mechanism 2 extending in the axial direction are parallel to the axial direction, magnetic poles can be formed without performing special processing.

[0123] Here, if at least one of the greatest common divisor of the first pole number and the third pole number and the greatest common divisor of the second pole number and the third pole number is 1, and the multiple segments are composed of the following two types of segments, the spatial first-order component of the electromagnetic excitation force can be effectively reduced. The two types of segments are: segments of a first configuration mode in which the magnetic poles are configured in a first positional relationship as the positional relationship of the above-mentioned magnetic poles (for example, the first segment 5a); and segments of a second configuration mode in which the magnetic poles are configured in a second positional relationship relative to the segments of the first configuration mode (for example, the first segment 5a, the third segment 5c) so that the phase difference θ is in an angle range greater than 120° and less than 240 degrees based on the mechanical angle reference (for example, the second segment 5a).

[0124] Alternatively, if at least one of the greatest common divisor of the first pole number and the third pole number and the greatest common divisor of the second pole number and the third pole number is 1, and the multiple segments are composed of the following two types of segments, the spatial secondary component of the electromagnetic excitation force can be effectively reduced, the two types of segments being: segments of a first configuration pattern in which the magnetic poles are configured in a first positional relationship as the positional relationship of the above-mentioned magnetic poles (for example, the first segment 5a); and segments of a second configuration pattern in which the magnetic poles are configured in a second positional relationship relative to the segments of the first configuration pattern (for example, the first segment 5a, the third segment 5c) so that the phase difference θ is in an angular range greater than 60° and less than 120° or greater than 240° and less than 300 degrees based on a mechanical angle reference (for example, the second segment 5a).

[0125] Furthermore, if the magnetic gap 5g is provided between adjacent segments (for example, the first segment 5a and the second segment 5b) among the plurality of segments, the leakage magnetic flux between the adjacent segments can be reduced, and a reduction in the transmission torque can be suppressed.

[0126] If the plurality of sections are divided into three or more sections (for example, the first section 5a, the second section 5b, and the third section 5c), the order of the vibration mode of the bending force in the axial direction can be increased, thereby reducing the bending force.

[0127] At this time, if the positional relationship between the magnetic poles of the multi-pole mechanism 4, the few-pole mechanism 2 and the pole piece 3 of at least two of the three or more segments (for example, the first segment 5a and the third segment 5c) is the same, the number of vibration modes of the axial bending force can be increased and the bending force can be reduced without increasing the types of components and complicating the process.

[0128] Description of Reference Numerals

[0129] 1: magnetic gear, 2: few-pole mechanism, 2m: permanent magnet, 3: pole piece, 4: multi-pole mechanism, 4m: permanent magnet, 5: magnetic gear part, 5a: first section, 5b: second section, 5c: third section, 6: few-pole rotor shaft (first shaft or second shaft), 7: multi-pole rotor shaft (second shaft or first shaft), Np2: number of poles (second number of poles), Np3: number of poles (third number of poles), Np4: number of poles (first number of poles), X: rotation axis, θ: phase difference.

Claims

1. A magnetic gear, characterized in that: The magnetic gear has: The magnetic gear unit is configured to include: a multi-pole mechanism in which magnetic poles of a first number of poles formed by permanent magnets are arranged along the circumferential direction; and a small-pole mechanism in which magnetic poles of a second number of poles less than the first number of poles formed by permanent magnets are arranged along the circumferential direction; and pole pieces of a third number of poles formed of a soft magnetic body arranged circumferentially with respect to the poles of the multi-pole mechanism and the poles of the few-pole mechanism via magnetic gaps, respectively, to share the function of any one of the stator, the first rotor, and the second rotor; A first shaft, which is responsible for transmitting torque between the first rotor and the outside; as well as The second shaft, which is responsible for transmitting the torque of the second rotor to the outside, In the magnetic gear portion, between adjacent sections among a plurality of sections divided along the axial direction, the positional relationship of the magnetic poles among the multi-pole mechanism, the few-pole mechanism and the pole piece is different, so that at least one of the multi-pole mechanism, the few-pole mechanism and the pole piece has a phase difference, And at least one of the greatest common divisor of the first pole number and the third pole number and the greatest common divisor of the second pole number and the third pole number is 1 or 2.

2. The magnetic gear according to claim 1, characterized in that: The surfaces of the permanent magnets used in the multi-pole mechanism and the few-pole mechanism respectively extending in the axial direction are parallel to the axial direction.

3. The magnetic gear according to claim 1 or 2, characterized in that: At least one of the greatest common divisor of the first pole number and the third pole number and the greatest common divisor of the second pole number and the third pole number is 1, The plurality of segments are composed of the following two types of segments: segments of a first arrangement pattern in which magnetic poles are arranged in a first positional relationship as the positional relationship of the magnetic poles; And the segments of the second arrangement pattern are arranged with respect to the segments of the first arrangement pattern so that the phase difference is within an angular range greater than 120 degrees and less than 240 degrees based on a mechanical angle.

4. The magnetic gear according to claim 1 or 2, characterized in that: At least one of the greatest common divisor of the first pole number and the third pole number and the greatest common divisor of the second pole number and the third pole number is 2, The plurality of segments are composed of the following two types of segments: segments having a first arrangement pattern in which magnetic poles are arranged in a first positional relationship as the positional relationship of the magnetic poles; And the segments of the second configuration pattern are configured with the magnetic poles in a second positional relationship relative to the segments of the first configuration pattern so that the phase difference is within an angular range of greater than 60° and less than 120° or greater than 240° and less than 300 degrees based on a mechanical angle.

5. The magnetic gear according to any one of claims 1 to 4, characterized in that: A magnetic gap is provided between adjacent segments among the plurality of segments.

6. The magnetic gear according to any one of claims 1 to 5, characterized in that: The plurality of segments are divided into three or more segments.

7. The magnetic gear according to claim 6, characterized in that: The positional relationship of the magnetic poles of at least two of the three or more segments is the same.

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