JP5792411B1 - Magnetic rotating device - Google Patents

Abstract

The present invention provides a magnetic rotating device capable of solving both problems of improvement in efficiency and downsizing of an apparatus. A magnetic rotating device includes a stator and a rotating body. A plurality of electromagnets 17 are fixed to the frame 23 of the stator 12. The core 30 of the electromagnet 17 has a body portion 28 extending in the axial direction of the shaft 37 and two leg portions 29 extending from the body portion 28 to the shaft 37. The leg portion 29 is formed in a rectangular parallelepiped shape that is long in the axial direction of the shaft 37 and short in the circumferential direction, and the body portion 28 is formed in a rectangular parallelepiped shape that is short in the radial direction of the shaft 37 and long in the circumferential direction. The cross-sectional area of the trunk | drum 28 and the cross-sectional area of each leg part 29 are the same. [Selection] Figure 5

Description

  The present invention includes a stator provided with an electromagnet having two magnetic poles, and a rotor provided with a field body so that magnetic poles of the same polarity or different polarity face the magnetic poles of the electromagnet. The present invention also relates to a magnetic force rotating device that rotates the rotor by the electromagnet acting on the field body.

  2. Description of the Related Art A magnetic force rotating device including a rotating body (rotor) in which a permanent magnet (field body) is disposed and an electromagnet that generates a magnetic force in a repulsive direction with respect to the magnetic pole of the permanent magnet of the rotating body is widely known. (See Patent Documents 1 and 2). The magnetic force rotating apparatus described in Patent Documents 1 and 2 includes two disk-shaped rotating bodies provided so as to be rotatable around one rotating shaft, permanent magnets attached to the rotating bodies, And an electromagnet that generates a magnetic field toward each permanent magnet of the rotating body. When the permanent magnet reaches the position closest to the electromagnet by rotating the rotating body, the electromagnet is energized and magnetic flux is generated in the electromagnet. Thereby, a repulsive force is generated between the electromagnet and the permanent magnet. When this force acts in the direction in which the rotating body is rotated, rotational torque is generated for the rotating body, and a desired rotational force is obtained from the rotating shaft of the rotating body.

  Here, the general electromagnet 100 used for the said magnetic rotating apparatus is shown in FIG. FIG. 8 is a schematic diagram showing an electromagnet 100 used in a conventional magnetic rotating device, (A) is a front view of the electromagnet 100, and (B) is a bottom view of the electromagnet 100. The electromagnet 100 is provided on each of two leg portions 102 of a so-called C-type core (iron core) 101 formed so that magnetic poles 106 and 107 (N pole and S pole) are arranged on one side. The coil 104 is provided. The core 101 is supported by a support plate (not shown). In addition, the cross-sectional shape of the leg part 102 of the magnetic poles 106 and 107 is a square whose length of one side is m [cm].

JP 2006-187080 A Japanese Patent No. 3713327

  As a method for increasing the driving torque of the magnetic rotating device, for example, as shown in FIG. 7, two electromagnets 100 are provided so as to be arranged in the axial direction of the rotating shaft, and permanent magnets corresponding to the magnetic poles 106 and 107 of each electromagnet 100 are provided. A configuration is possible in which these are arranged. The two electromagnets 100 have a total of four magnetic poles. When these four magnetic poles act on the permanent magnets arranged so as to face the magnetic poles, a large driving torque can be obtained as compared with the configuration of one electromagnet 100. However, the configuration in which the two electromagnets 100 are arranged side by side in the axial direction has a problem that the apparatus becomes large in the axial direction.

  On the other hand, as another method for increasing the driving torque of the magnetic rotating device, it is conceivable to increase the magnetomotive force of the electromagnet 100 by increasing the number of turns of the coil 104 of the electromagnet 100. However, if the number of turns of the coil 104 is increased, the magnetomotive force of the electromagnet 100 is increased, but the winding thickness of the coil 104 is increased, the electric wire is lengthened, the electric resistance is increased, and the efficiency of the magnetic rotating device is deteriorated. In addition, when the number of turns of the coil 104 is increased, the outer diameter of the coil 104 is increased, resulting in a problem that the apparatus is increased in size. Further, as another method for increasing the driving torque of the magnetic rotating device, it is conceivable to increase the magnetic pole strength of the electromagnet 100 relatively by increasing the cross-sectional area of the core 101 and reducing the magnetic resistance. However, in the conventional electromagnet 100, if the core 101 having a square magnetic pole surface shape is enlarged, the size of the device increases in the axial direction of the magnetic rotating device and the direction perpendicular to the rotating shaft (the radial direction of the rotating shaft). There is a problem of doing.

  Therefore, the present invention has been made in view of the above circumstances, and an object thereof is to provide a magnetic rotating device capable of solving both the problems of improvement in efficiency and miniaturization of the apparatus.

(1) The present invention provides a stator provided with an electromagnet having two magnetic poles, a rotor provided with a field body so that magnetic poles of the same polarity or different polarity face the magnetic poles of the electromagnet, The magnetic rotating device is configured to rotate the rotor by the electromagnet acting on the field body. The electromagnet is provided on each of the legs, a core having a trunk extending along the rotation axis direction of the rotor, and two legs extending in a direction from the trunk toward the rotation center of the rotor. And a coil. The trunk is formed in a shape that is longer in the circumferential direction of the rotor than in the radial direction of the rotor, and the leg is in a shape that is longer in the rotational axis direction of the rotor than in the circumferential direction. Is formed.

  Since it is configured in this manner, the magnetic resistance is reduced and the magnetic flux in the magnetic pole is reduced by increasing the cross-sectional area of the core body and legs without changing the current value flowing through the coil and the number of turns of the coil. Can be increased. As a result, the magnetic force acting on the magnetic pole is increased, and the efficiency of the magnetic rotating device is improved. Moreover, since the trunk | drum is formed in the shape longer in the said circumferential direction rather than the said radial direction, a magnetic rotating apparatus does not enlarge in the said radial direction. Further, compared with the conventional configuration (see FIG. 7) in which two conventional electromagnets are juxtaposed in the direction of the rotation axis of the rotor, a magnetic flux equivalent to that of the conventional configuration is generated while being compact in the direction of the rotation axis. be able to.

(2) It is preferable that a cross-sectional area perpendicular to the magnetic path in the trunk portion is substantially the same as a cross-sectional area perpendicular to the magnetic path in the leg portion. When the cross-sectional area of the trunk part and the cross-sectional area of the leg part are the same, the area is the same regardless of the cross-section of any part of the core. Thereby, since the magnetic flux density is constant in any part of the magnetic path of the electromagnet, magnetic saturation is difficult to occur. As a result, the magnetic resistance in the magnetic path of the core is reduced. In the configuration in which the trunk portion is formed in a shape that is elongated in the circumferential direction and the leg portion is formed in a shape that is elongated in the rotation axis direction, the cross-sectional area of the trunk portion and the section of the leg portion are cut off. If the area is the same, the body portion naturally becomes flat in the radial direction, and therefore the distance from the center of the body portion to the magnetic pole surface of the leg portion is shortened, and accordingly, the magnetic path of the core. The length is also shortened and the magnetic resistance in the core is reduced. In addition, when the cross-sectional area of the body portion is smaller than the cross-sectional area of the leg portion, the magnetic resistance of the body portion is larger than the magnetic resistance of the leg portion due to the influence of magnetic saturation in the body portion, and the electromagnet Therefore, the cross-sectional area of the body portion is preferably larger than the cross-sectional area of the leg portion.

(3) The field body includes a first permanent magnet provided to face one magnetic pole of the electromagnet and a second permanent magnet provided to face the other magnetic pole of the electromagnet. ing. In this case, a magnetic body that connects the magnetic pole surface opposite to the magnetic pole surface of the first permanent magnet facing the electromagnet and the magnetic pole surface opposite to the magnetic pole surface of the second permanent magnet facing the electromagnet. Is provided.

  For example, the electromagnet of the magnetic rotating device of the present invention has a configuration in which the length of the leg portion in the radial direction is the same as the conventional length, and the length of the leg portion in the rotational axis direction is longer than the conventional length. In some cases, if a coil having the same winding amount as a conventional electromagnet is attached, the magnetic path length of the electromagnet of the magnetic rotating device of the present invention is longer in the direction of the rotation axis than the magnetic path length of the conventional electromagnet. In this case, since the magnetic resistance is proportional to the magnetic path length, the increase in the magnetic path length has an effect, and the magnetic resistance in the magnetic path of the electromagnet of the present invention becomes larger than the conventional configuration. On the other hand, as described above, when the field body is constituted by the first permanent magnet and the second permanent magnet, the permanent magnets are connected by the magnetic body, for example, the first permanent magnet. The magnetic flux penetrating through the magnetic pole surface to the back surface can reach the second permanent magnet through the magnetic material having a small magnetic resistance without passing through a space having a large magnetic resistance. By providing the magnetic material in this way, the decrease in the magnetic flux due to the increase in the magnetic path length of the electromagnet is compensated, and the decrease in the magnetic flux in the magnetic path formed between the electromagnet and the permanent magnet is prevented. Can do.

(4) The leg portion extends from the center in the circumferential direction toward the rotation center of the rotor in the trunk portion, and the trunk portion has a first flange portion projecting in the circumferential direction. ing.

  Thereby, the edge part of a coil can be protected by a 1st collar part. Moreover, since the magnetic flux leaking from the first collar easily returns to the magnetic pole, the magnetic flux in the electromagnet increases, and as a result, the efficiency of the magnetic rotating device can be improved.

(5) It is preferable that the protrusion dimension of the said 1st collar part is substantially the same as the thickness dimension of the said coil provided in the said leg part. With this configuration, the coil does not protrude outward from the first flange.

(6) The body portion includes second collar portions that project in the rotational axis direction from both ends of the rotational axis direction of the body portion, and the projecting dimension of the second collar portion is the first collar portion. Are the same projecting dimensions. If it is this structure, a coil will not protrude outside the said rotation center direction. In addition, since the magnetic flux leakage from the second flange portion easily returns to the magnetic pole, the magnetic flux in the electromagnet increases, and as a result, the efficiency of the magnetic rotating device can be improved.

(7) the core is the radial length and the circumferential direction of both the same dimension W ₁ is the length in the leg portion of the body portion, the circumferential length and the leg in the body portion It is preferable that the lengths in the direction of the rotation axis in the part are the same dimension W ₂ and W ₂ = kW ₁ (where k> 1).

(8) Moreover, it is preferable that the said electromagnet is provided with two or more along the said circumferential direction.

  According to the magnetic rotating device of the present invention, it is possible to increase the drive torque while maintaining high efficiency without increasing the number of turns of the coil and without increasing the size of the device in the radial direction.

FIG. 1 is a perspective view schematically showing a schematic configuration of a magnetic rotating device 10 according to an embodiment of the present invention. FIG. 2 is a plan view schematically showing a schematic configuration of the magnetic rotating device 10. FIG. 3 is a schematic diagram showing the configuration of the electromagnet 17 and is a schematic cross-sectional view taken along the section line III-III in FIG. FIG. 4 is a schematic diagram showing the configuration of the electromagnet 17 and is a schematic cross-sectional view taken along the section line IV-IV in FIG. FIG. 5 is a perspective view schematically showing the configuration of the electromagnet 17 and the core 30. FIG. 6 is a perspective view schematically showing a modified example of the configuration of the electromagnet 17 and the core 30. FIG. 7 is a schematic diagram showing a configuration of a conventional electromagnet 100 used in a conventional magnetic rotating device. FIG. 8 is a schematic view showing an arrangement example of the electromagnet 100 in the conventional magnetic rotating device. It is sectional drawing.

  Hereinafter, a magnetic rotating device 10 according to an embodiment of the present invention will be described with reference to the drawings as appropriate.

[Outline of Magnetic Rotation Device 10]
As shown in FIGS. 1 and 2, the magnetic rotating device 10 mainly includes a stator 12 (an example of the stator of the present invention) having a plurality of electromagnets 17 (an example of the electromagnet of the present invention), and a plurality of permanent magnets. A rotating body 14 (an example of a rotor of the present invention) having a magnet 19 (an example of a field body of the present invention) and a control device 21 (see FIG. 2) for controlling the magnetic force rotating device 10 are provided. The electromagnet 17 has two magnetic poles 34 (34A, 34B). The control device 21 calculates the rotation angle of the position detection disk 45 based on a signal from a position detection sensor 46 (see FIG. 2) to be described later, and the coil at the timing when the permanent magnet 19 comes closest to the magnetic pole 34 of the electromagnet 17. 32 is temporarily supplied with current. In FIG. 1, the display of the position detection disk 45 and the position detection sensor 46 is omitted. In the magnetic rotating device 10 configured as described above, the magnetic repulsive force (the magnetic charge of the magnetic pole 34 and the magnetic charge of the permanent magnet 19 is affected by the interaction between the magnetic field of the magnetic pole 34 of the electromagnet 17 and the magnetic field of the permanent magnet 19. Magnetic repulsive force). The rotating body 14 is rotated by the magnetic repulsive force acting in the rotating direction of the rotating body 14. The magnetic rotating device 10 operates as an electric motor (motor) when a driving current is supplied, and operates as a generator when an external force is supplied and the rotating body 14 is rotated. Hereinafter, each component of the magnetic rotating device 10 will be described in detail.

[Rotating body 14]
As shown in FIG. 2, the rotating body 14 includes a shaft 37 that is an example of a rotating shaft, and two support disks 39 (39 </ b> A and 39 </ b> B) through which the shaft 37 passes. Each support disk 39 is formed in the same shape and the same size, and these are fixed to the shaft 37. The support disks 39A and 39B are arranged in order from one end of the shaft 37 (upward end portion in FIG. 2), and are maintained in parallel with each other at a predetermined interval via a spacer 41. It is fixed to the shaft 37. The shaft 37 is rotatably supported by a pair of side plates 25 (25A, 25B) which will be described later, so that the rotating body 14 can rotate around the shaft 37. The interval between the support disks 39 is determined by the interval between the magnetic poles 34 of the electromagnet 17 and the interval between the permanent magnets 19.

  As shown in FIG. 3, a plurality of permanent magnets 19 are attached to the outer edge of each support disk 39. Four permanent magnets 19 are attached to each support disk 39. The four permanent magnets 19 are arranged only on one surface (one surface) of the support disk 39. In all the support disks 39, the four permanent magnets 19 are arranged at an equal pitch along a circumferential direction along the circumference of the shaft 37 (corresponding to the circumferential direction of the present invention). Specifically, the permanent magnet 19 is attached at an angular interval α (= 90 °) obtained by dividing the support disk 39 into four in the circumferential direction around the shaft 37.

  As shown in FIG. 3, the permanent magnet 19 has an angle β of 40 to 70% with respect to an angular interval α (= 90 °) divided into four in the circumferential direction on each surface of each support disk 39. It is arranged to occupy. That is, when the angle interval α is 90 °, the permanent magnet 19 is arranged so that the angle β is 36 ° to 63 °. FIG. 3 shows a state where the angle β is 36 °. In consideration of demagnetization by the permanent magnets 19 adjacent to each other in the circumferential direction of the shaft 37, the ratio of the permanent magnets 19 to the angle interval α, that is, the ratio of the angle β in the angle interval α is set to 70% or less. Is preferred.

  In this embodiment, as an example of the rotor of the present invention, the rotating body 14 in which the permanent magnet 19 is attached to each of the two support disks 39 is illustrated. However, the rotor of the present invention is limited to such a configuration. I can't. For example, a cylindrical body or a cylindrical body having rotating shafts at both ends is provided, and four permanent magnets are attached to the outer peripheral surface along the circumferential direction of the rotating shaft. The group may be a rotating body (rotor) having a configuration in which two groups are provided at predetermined intervals in the axial direction of the rotating shaft. In this embodiment, four permanent magnets 19 are arranged in the circumferential direction of the shaft 37. However, the number of permanent magnets 19 may be four or more, less than four, and six or five may be three. It is sufficient that at least one permanent magnet 19 is provided. However, in the case where only one permanent magnet 19 is attached to the support disk 39, it is necessary to provide a balancer of the same mass on the opposite side across the shaft 37 in order to maintain the weight balance of the rotating body 14.

  The permanent magnet 19 is a substantially rectangular flat plate with magnetic poles formed on the front and back surfaces. The permanent magnet 19 is fixed to the support disk 39 by embedding one side end of the permanent magnet 19 on the outer peripheral edge of the support disk 39 by about several millimeters.

  Further, as shown in FIG. 3, each permanent magnet 19 penetrates a straight line L <b> 1 that connects the center O of the permanent magnet 19 with the center O of the support disk 39 and the magnetic pole direction of the permanent magnet 19, that is, the front and back surfaces of the permanent magnet 19. It arrange | positions so that the angle (gamma) which the straight line L2 which shows a normal line direction may be 30 degrees or more and 60 degrees or less.

  The permanent magnet 19 is attached to the outer edge portion of the support disk 39 with either the N pole or the S pole directed to the outside of the support disk 39. In the present embodiment, as shown in FIG. 4, in the support disk 39 </ b> A, the south pole faces outward (outward) in the radial direction of the support disk 39 or the rotating body 14 (corresponding to the radial direction of the present invention). In this state, a permanent magnet 19 is attached. Further, in the support disk 39 </ b> B, the permanent magnet 19 is attached in a state where the N pole is directed outward (outward) in the radial direction of the shaft 37. Since the permanent magnet 19 is attached in this way, when the rotating body 14 rotates to a predetermined rotation angle and the permanent magnet 19 comes closest to the magnetic pole 34 of the electromagnet 17, the magnetic pole of the permanent magnet 19 has the same polarity. It will be in the state which opposes the magnetic pole 34 of the electromagnet 17 (refer FIG.3 and FIG.4).

  As shown in FIGS. 1 and 4, the permanent magnets 19 provided on the respective support disks 39 </ b> A and 39 </ b> B are arranged side by side in the axial direction of the shaft 37 (corresponding to the rotational axis direction of the present invention). . When the rotating body 14 reaches a predetermined rotation angle, as shown in FIG. 4, among the permanent magnets 19A and 19B arranged in parallel in the axial direction, the S pole of the permanent magnet 19A is the magnetic pole 34A (S pole) of the electromagnet 17. ) And the N pole of the permanent magnet 19B faces the magnetic pole 34B (N pole) of the electromagnet 17. The permanent magnets 19A and 19B arranged in this way are examples of the first permanent magnet and the second permanent magnet of the present invention. The permanent magnets 19A and 19B are connected by a yoke 43 (an example of the magnetic body of the present invention) made of a ferromagnetic material such as iron. Specifically, as shown in FIGS. 1 and 4, a yoke 43 is provided on the back side of each permanent magnet 19 </ b> A, 19 </ b> B. One end of the yoke 43 is supported by the support disk 39A by being embedded in the support disk 39A. The yoke 43 extends through the through hole (not shown) formed in the support disk 39B in the axial direction to the back surface of the permanent magnet 19B. The back surfaces of the permanent magnets 19A and 19B are coupled to the yoke 43 arranged in this way. Thereby, the permanent magnet 19 </ b> A and the permanent magnet 19 </ b> B are connected by the yoke 43. In this embodiment, four yokes 43 are supported by the support disks 39A and 39B, and one yoke 43 has one permanent magnet 19 that the support disk 39A has and one support disk 39B that has one support disk 39B. The permanent magnet 19 is coupled.

[Stator 12]
As shown in FIGS. 1 and 2, the stator 12 is provided outside the rotating body 14. In other words, the rotating body 14 is provided inside the stator 12. That is, the magnetic rotating device 10 of this embodiment is a so-called inner rotor type rotating device. The present invention is not limited to the inner rotor type, but can be applied to an outer rotor type or a flat rotor type.

  The stator 12 includes a frame 23 and an electromagnet 17 held by the frame 23. The frame 23 is bridged between a pair of side plates 25 (25A, 25B) provided on the outer sides of the support disks 39A and 39B and parallel to each other, and the pair of side plates 25. And four support plates 31 to be fixed. The shaft 37 is supported by a shaft hole (not shown) formed at the center of each side plate 25 via a bearing (not shown), whereby the rotating body 14 can be rotated.

  A total of four electromagnets 17 are attached to the frame 23. As will be described later, the electromagnet 17 is fixed to four support plates 31 spanned between the side plates 25. In this embodiment, the stator 12 in which four electromagnets 17 are attached to the frame 23 is illustrated as an example of the stator of the present invention. However, the stator of the present invention is not limited to such a configuration. It is sufficient that at least one electromagnet 17 is provided on the frame 23.

  As shown in FIG. 2, a position detection disk 45 is provided inside the side plate 25B. The position detection disk 45 is fixed to the shaft 37 so that it can rotate coaxially with each support disk 39. The position detection disk 45 is, for example, a transparent plastic plate, and a light shielding tape or the like is attached to a predetermined portion on the periphery. The frame 23 is provided with a position detection sensor 46 such as a photo interrupter. The position detection sensor 46 includes a light emitting element and a light receiving element, and is disposed so as to irradiate the detection light to the periphery of the position detection disk 45. The position detection sensor 46 notifies the control device 21 of the rotational position of the permanent magnet 19 of the rotating body 14. The controller 21 energizes the coil 32 of the electromagnet 17 based on this rotational position.

[Electromagnet 17]
As shown in FIG. 2, the four electromagnets 17 are arranged so that the two magnetic poles 34 are arranged in a line along the axial direction of the shaft 37. In the present embodiment, one electromagnet 17 is fixed to each of the four support plates 31. The support plate 31 is a long plate-like member having a thickness and formed of resin, nonmagnetic metal, or the like. Both ends in the longitudinal direction are fixed to the pair of side plates 25 by a connector such as a screw. Yes. The support plate 31 also serves as a cover that covers the body 28 side of the electromagnet 17. As shown in FIG. 3, the four electromagnets 17 are attached at equal intervals in the circumferential direction of the shaft 37 at an angular interval of 90 °. Each electromagnet 17 has the same configuration except that the arrangement position is different.

  As shown in FIG. 4, the electromagnet 17 has a core 30 (an example of the core of the present invention). The core 30 is made of a ferromagnetic material, and in the present embodiment, a laminate of a plurality of plate-shaped silicon steel plates is used. Each silicon steel sheet is coated with an insulating paint so that eddy currents are less likely to occur when energized. The core 30 has a shape viewed from one side surface (the surface shown in FIG. 4) formed in an alphabetic C-shape, U-shape, or a U-shape in Katakana. It is also called a mold core. Further, as will be described later, the shape of the core 30 viewed from the other side surface is formed into an alphabetic T shape (see FIG. 5).

  The core 30 includes a body portion 28 that extends straight along the axial direction of the shaft 37, and two leg portions that extend from both ends 28 </ b> A and 28 </ b> B of the body portion 28 in the radial direction perpendicular to the shaft 37. 29A and 29B (hereinafter, the leg portions 29A and 29B are collectively referred to as the leg portion 29).

  Each leg portion 29 of the core 30 is provided with a coil 32 (an example of the coil of the present invention) formed by winding an electric wire. Each leg 29 is provided with a coil 32 having the same number of turns (number of turns). An insulating tape (not shown) is wound around the outer peripheral surface of the coil 32. Therefore, the outer peripheral surface of the coil 32 is kept insulated from the outside by the insulating paint and the insulating tape of the electric wire. When the coil 32 is energized, the S pole 34A appears on one end face (end face of the leg 29A) of the core 30, and the N pole 34B appears on the other end face (end face of the leg 29B) of the core 30. .

As shown in FIG. 5, the body portion 28 of the core 30 is formed in a rectangular parallelepiped shape extending along the axial direction of the shaft 37 (see arrow 73). The body portion 28 has a size W ₂ (see arrow 72) in the circumferential direction of the shaft 37 (see arrow 72) rather than a size W _{1 in} the radial direction of the shaft 37 (see arrow 71) (hereinafter simply referred to as “size W ₁ ”). Hereinafter, it is simply abbreviated as “size W ₂ ”). Specifically, the size W ₂ of the body portion 28 is formed to be twice the size W _1. For example, when the size W ₁ of the body portion 28 is m [cm], the size W ₂ is 2 W ₁ (= 2 m [cm]). That is, the size W ₁ and the size W ₂ of the body portion 28 satisfy the relationship of W ₂ = 2W ₁ (= 2m). In FIG. 5, the radial direction of the shaft 37 matches the direction indicated by the arrow 71, the circumferential direction of the shaft 37 matches the direction indicated by the arrow 72, and the axial direction of the shaft 37 matches the direction indicated by the arrow 73. The same shall apply in the following.

Further, each leg portion 29 extends straight from the center in the circumferential direction of the shaft 37 in the body portion 28 in the radial direction of the shaft 37 and is formed in a rectangular parallelepiped shape that is long in the radial direction. The leg portion 29 is abbreviated as the size W _{4 in} the axial direction of the shaft 37 (hereinafter simply referred to as “size W ₄ ”) than the size W _{3 in} the circumferential direction of the shaft 37 (hereinafter simply referred to as “size W ₃ ”). Is formed into a long shape. Specifically, the size W ₄ of the leg portion 29 is formed to be twice the size W ₃ . For example, when the size W ₃ of the leg portion 29 is m [cm], the size W ₄ is 2 W ₃ (= 2 m [cm]). That is, the size W ₃ and the size W ₄ of the leg portion 29 satisfy the relationship of W ₄ = 2W ₃ (= 2m). The axial size of the trunk portion 28 and the radial size of the leg portion 29 are arbitrarily determined depending on the thickness of the coil 32 provided on the leg portion 29.

In the present embodiment, as described above, the size W ₁ of the trunk portion 28 and the size W ₃ of the leg portion 29 are the same dimension m [cm], and the size W ₂ of the trunk portion 28 and the leg portion 29 are the same. The size W ₄ is the same dimension of 2 m [cm], and the body portion 28 and the leg portion 29 both have a rectangular parallelepiped shape, so that the cross-sectional area of the body portion 28 and the cross-sectional area of the leg portion 29 are Are the same.

  Since the body portion 28 and the two leg portions 29 of the core 30 are configured as described above, the body portion 28 of the core 30 is bent from the leg portion 29 to the circumferential direction of the shaft 37 as shown in FIG. It has the two hook-shaped parts 51 (an example of the 1st hook part of this invention) which protrudes in a shape. As shown in FIG. 5B, the protruding length of the hook-shaped portion 51 is substantially the same as the thickness of the coil 32 provided on the leg portion 29. The leg portion 29 is provided so as not to protrude from the flange portion 51 outward in the circumferential direction.

[Operations and effects of the embodiment]
As described above, in the magnetic rotating apparatus 10, the body portion 28 of the core 30 of the electromagnet 17 is formed in a shape towards the size W ₂ than the size W ₁ is elongated, and the two Each of the leg portions 29 is formed in a shape in which the size W _{4 is} longer than the size W ₃ . Therefore, the cross-sectional area of the core 30 is made larger and magnetic compared to the conventional magnetic rotating device using the conventional electromagnet 100 (see FIGS. 7 and 8) having a square shape with one leg of m [cm]. By reducing the resistance, the strength of the magnetic pole of the electromagnet 17 can be increased without changing the value of the current flowing through the coil 32 and the number of turns of the coil. As a result, the efficiency of the magnetic rotating device 10 is improved. Moreover, since the trunk | drum 28 is formed in the flat shape in the radial direction of the shaft 37, the highly efficient magnetic force rotating apparatus 10 is realizable, without enlarging in the said radial direction. In addition, the amount of winding of the coil can be reduced as compared with the conventional method of increasing the rotational torque using a plurality of conventional electromagnets 100.

  Further, since the cross-sectional area of the trunk portion 28 and the cross-sectional area of the leg portion 29 are the same and the trunk portion 28 is formed in a flat shape in the radial direction of the shaft 37, the leg portion 29 extends from the center of the trunk portion 28. The distance to the magnetic pole surface of the magnetic pole 34 is shortened, and the length of the magnetic path (magnetic path length) passing through the center of the core 30 is shortened accordingly, and the magnetic resistance in the core 30 is reduced.

Since the size W ₄ of the leg 29 is longer than the size W ₃ of the leg 29, the coil 32 of the electromagnet 17 is connected to the conventional electromagnet 100 (see FIGS. 7 and 8). When the number of turns is the same as that of the coil 104, the interval 49 between magnetic poles of the electromagnet 17 (see FIG. 5B) is longer than the interval 109 between magnetic poles of the conventional electromagnet 100 (see FIG. 8). Thereby, the sum total of the magnetic path length of the electromagnet 17 becomes longer than the sum of the magnetic path lengths of the conventional electromagnet 100, and in particular, the length of the magnetic path passing through the space (hereinafter referred to as “space magnetic path length”). It becomes longer than the conventional configuration. When the spatial magnetic path length is increased, the magnetic resistance of the electromagnet 17 becomes larger than that of the conventional electromagnet 100 due to the increase in the spatial magnetic path length. However, since the permanent magnet 19A and the permanent magnet 19B are connected by the yoke 43 as described above, the magnetic flux that has passed through the magnetic pole surface of the permanent magnet 19B to the back surface thereof does not pass through a space having a large magnetic resistance. The permanent magnet 19A is reached through the yoke 43 having a small magnetic resistance. Thereby, the decrease in magnetic flux due to the increase in the magnetic path length in the electromagnet 17 is compensated, and the decrease in the magnetic flux in the magnetic path formed between the electromagnet 17 and the permanent magnet 19 can be prevented.

  Moreover, since the yoke 43 is provided on the back surface of the permanent magnet 19 as described above, the magnetic flux generated from the back surface of the permanent magnet 19 is less likely to affect the shaft 37 and the bearing supporting the shaft 37. For this reason, the shaft 37 and the bearing are not magnetized, and adhesion of iron powder due to magnetization is prevented. In the configuration in which the yoke 43 is not provided, a voltage is generated in the shaft 37 due to the influence of magnetic flux, and a current may be generated due to a potential difference between both ends of the shaft 37. In this case, the iron powder adhering to the bearing and the generated current cause arc discharge in the vicinity of the bearing, and the bearing fails. However, in this embodiment, since the yoke 43 is provided on the back surface of the permanent magnet 19, arc discharge does not occur, and failure of the bearing due to arc discharge can be prevented.

  Further, since the body portion 28 has a flat shape in the radial direction of the shaft 37, for example, as shown in FIG. 4, a plurality (four in this embodiment) of electromagnets 17 are provided in the circumferential direction of the shaft 37. In addition, since the body portion 28 is disposed at a position farthest from the shaft 37, the adjacent electromagnets 17 are unlikely to interfere with each other. In the above-described embodiment, an example in which only four electromagnets 17 are provided has been described. However, for example, when a large number of electromagnets 17 are provided in the circumferential direction of the shaft 37, more interference is not caused between adjacent electromagnets 17. An electromagnet 17 can be arranged. In particular, in the configuration in which the electromagnets 17 are densely arranged in the circumferential direction of the shaft 37 as in a three-phase magnetic rotating device, the coils 32 of the leg portions 29 adjacent in the circumferential direction are close to each other. When the present invention is applied in such a configuration, when the magnetic rotating devices having the same output are compared with each other, the legs 29 are flat in the circumferential direction, and therefore the coils 32 of the adjacent legs 29 are adjacent to each other. It is possible to give a margin to the interval. Moreover, since the trunk | drum 28 is a shape flat in radial direction, an apparatus does not enlarge in a radial direction. Further, by sizing the leg portion 29 in the circumferential direction by the amount of room between the coils 32 of the leg portion 29, the magnetic rotator can be driven while maintaining the same radial size as the conventional magnetic rotator. Torque can be increased.

Further, as shown in FIG. 7, compared with a configuration in which two conventional electromagnets 100 having square legs 102 each having a side length of m [cm] are arranged, the cross-sectional areas of both electromagnets are the same. However, in the conventional electromagnet 100, the total of the outer circumferences of the legs 102 of the two electromagnets 100 is 16 m [cm], whereas the total of the outer circumference of the legs 29 of the electromagnet 17 is 12 m. [Cm]. Therefore, if the number of coil turns is the same, the amount of coil turns can be reduced to three-quarters by using the electromagnet 17 described above. Thereby, the copper loss in a coil falls. In the above-described embodiment, the size W ₃ of the leg 29 is set to m [cm], and the size W ₄ of the leg 29 is set to 2 W ₃ (= 2 m [cm]). It can be determined appropriately according to the output required for the magnetic rotating device 10. For example, when the size W ₃ of the leg portion 29 is set to m [cm], the size W ₄ of the leg portion 29 can be set to 3W ₃ (= 3 m [cm]). By doing so, a larger output can be obtained. Of course, when the size W ₃ of the leg 29 is 0.5 m [cm], the size W ₄ of the leg 29 is 2 W ₃ (= 1.0 m [cm]) or 3W ₃ (= 1.5 m). [Cm]). That is, it is only necessary to have a relationship of W ₃ = kW ₄ (where k> 1) between the size W ₃ and the size W ₄ of the leg portion 29. In the above-described embodiment, the size W ₁ of the body portion 28 is set to m [cm], and the size W ₂ of the body portion 28 is set to 2 W ₁ (= 2 m [cm]). similar to the case where the size _{W 1} of the trunk portion 28 is m [cm], it is also possible to make the size W2 of the trunk portion 28 _3W 1 and (= 3m [cm]). Of course, between the size _{W 1} and the size _{W 2} of the body portion _28, W 1 = kW ₂ (where, k> 1) may be any one having a relationship.

  Moreover, since the cross-sectional area of the trunk | drum 28 and the cross-sectional area of the leg part 29 are the same, even if it takes the cross section of any part of the core 30, an area becomes the same. Thereby, since the magnetic flux density is constant in any part of the magnetic path of the electromagnet 17, a stable magnetomotive force can be generated. In the above-described embodiment, the example in which the cross-sectional area of the trunk portion 28 and the cross-sectional area of the leg portion 29 are the same has been described. However, it is sufficient that the cross-sectional area of the trunk portion 28 is larger than the cross-sectional area of the leg portion 29. . If the cross-sectional area of the body part 28 is smaller than the cross-sectional area of the leg part 29, the magnetic resistance of the body part 28 becomes larger than the magnetic resistance of the leg part 29, and the magnetomotive force of the electromagnet 17 is reduced. Therefore, it is preferable that the cross-sectional area of the trunk portion 28 is larger than the cross-sectional area of the leg portion 29.

  Further, since the flange portion 51 is provided on the body portion 28 of the core 30, the magnetic flux easily returns from the flange portion 51 to the core 30, and the leakage magnetic flux increases. Thereby, since the magnetic flux in the electromagnet 17 increases and the magnetomotive force increases, the efficiency of the magnetic rotating device 10 can be improved. Moreover, since the protrusion length of the hook-shaped part 51 is substantially the same as the thickness of the coil 32 provided in the leg part 29, the side surface of the coil 32 protrudes from the hook-shaped part 51 to the outer side of the circumferential direction. There is nothing. In the above-described embodiment, the hook-shaped portion 51 protruding in the circumferential direction of the shaft 37 is illustrated, but for example, as shown in FIG. 7, both end portions 28 </ b> A of the trunk portion 28 in addition to the hook-shaped portion 51. , 28B may have a hook-like portion 52 (an example of the second hook portion of the present invention) protruding in the axial direction of the shaft 37. With this configuration, not only does the magnetic flux easily return from the bowl-shaped portion 52 to the core 30 to increase the leakage magnetic flux, but also the side surface of the coil 32 does not protrude outward in the axial direction.

  In the above-described embodiment, the configuration in which the permanent magnet 19 having the same polarity is disposed so as to face the magnetic pole 34 of the electromagnet 17 is illustrated. However, the permanent magnet 19 having a different polarity with respect to the magnetic pole 34 of the electromagnet 17 is provided. The present invention can also be applied to a magnetic rotating device in which a drive torque is generated in the rotating body 14 by arranging them to face each other.

DESCRIPTION OF SYMBOLS 10 ... Magnetic rotating apparatus 12 ... Stator 14 ... Rotating body 17 ... Electromagnet 19 ... Permanent magnet 28 ... Body part 29 ... Leg part 30 ... Core 32 ... · Coil 34 · · · magnetic pole 37 · shaft 51, 52 · · · bowl

Claims (8)

A stator provided with an electromagnet having two magnetic poles;
A rotor provided with a field body so that magnetic poles of the same polarity or different polarity face the magnetic poles of the electromagnet,
A magnetic rotating device that rotates the rotor by the electromagnet acting on the field body,
The electromagnet
A core having a trunk extending along the rotation axis direction of the rotor, and two legs extending in a direction from the trunk toward the rotation center of the rotor;
A coil provided on each of the legs,
The trunk is formed in a shape that is longer in the circumferential direction of the rotor than in the radial direction of the rotor, and the leg is in a shape that is longer in the rotational axis direction of the rotor than in the circumferential direction. Magnetic rotation device formed in the.   2. The magnetic force rotating device according to claim 1, wherein a cross-sectional area perpendicular to the magnetic path in the trunk portion is substantially the same as a cross-sectional area perpendicular to the magnetic path in the leg portion. The field body includes a first permanent magnet provided to face one magnetic pole of the electromagnet and a second permanent magnet provided to face the other magnetic pole of the electromagnet,
A magnetic body is provided that connects a magnetic pole surface opposite to the magnetic pole surface of the first permanent magnet facing the electromagnet and a magnetic pole surface opposite to the magnetic pole surface of the second permanent magnet facing the electromagnet. The magnetic rotating apparatus according to claim 1 or 2.   The said leg part is extended in the direction which goes to the rotation center of the said rotor from the center of the said circumferential direction in the said trunk | drum, The said trunk | drum has the 1st collar part which protrudes in the said circumferential direction. Item 4. The magnetic rotating device according to any one of Items 1 to 3.   The magnetic rotating apparatus according to claim 4, wherein a protruding dimension of the first flange portion is substantially the same as a thickness dimension of the coil provided on the leg portion.   The trunk portion has second collar portions that project in the rotational axis direction from both ends in the rotational axis direction of the trunk portion, and the projecting dimension of the second collar portion is the same as that of the first collar portion. The magnetic rotating apparatus according to claim 4 or 5. The core is the radial length and the circumferential direction of both the same dimension W ₁ is the length in the leg portion of the body portion, the in the circumferential direction of the length and the leg portion of the body portion the length of the rotation axis direction are both the same size _{W 2, W 2 = kW 1} ( however, k> 1) and the magnetic rotating apparatus according to claim 1 which is formed 6 a so.   The magnetic rotating apparatus according to claim 1, wherein a plurality of the electromagnets are provided along the circumferential direction.

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