JP2013176179A - Rotor and motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor that can suitably use magnetic force of a magnet.SOLUTION: A rotor core 20 includes first and second core blocks 21 and 22 which respectively include a magnet magnetic pole part 25 having a magnet 27a (magnet 27b), and two pseudo magnetic pole parts 26 that function as a magnetic pole opposite the magnet magnetic pole part 25 by the magnetic action of the magnet 27a (magnet 27b). The first and second core blocks 21 and 22 are connected to each other via a magnetic resistance part 23. The magnet magnetic pole parts 25 of the core blocks 21 and 22 are identical in number and have opposite polarity to each other. The magnet magnetic pole part 25 and the pseudo magnetic pole parts 26 are disposed on an outer peripheral part of the rotor core 20 so as to alternately have opposite polarity in a circumferential direction.

Description

  The present invention relates to a rotor and a motor.

  Conventionally, as shown in Patent Document 1, for example, a so-called continuous pole type rotor (half magnet type rotor) in which a plurality of magnets are arranged in the circumferential direction of the outer peripheral surface of the rotor core and the iron core part between the magnets functions as a pseudo magnetic pole part. A motor equipped with a motor is also devised. The pseudo magnetic pole portion functions as a magnetic pole opposite to the magnet by the magnetic action of the magnet. Thereby, the N pole and the S pole are alternately formed in the circumferential direction on the outer peripheral surface of the rotor. In such a configuration, the number of magnets can be reduced with respect to a rotor (full magnet type rotor) having the same number of magnetic poles and magnets, which is advantageous in terms of the number of parts and cost.

JP 9-327139 A

  However, in the case of a half magnet type rotor, for example, when an inexpensive ferrite magnet is used as the magnet, the magnetic force of the magnet is weak, and it is difficult to sufficiently function the pseudo magnetic pole portion as a magnetic pole. Therefore, it is conceivable to use a magnet having a strong magnetic force such as a rare earth magnet (for example, a neodymium magnet), but in this case, the leakage magnetic flux becomes excessive, and the strong magnetic force of the magnet can be fully utilized. difficult.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a rotor and a motor capable of appropriately utilizing the magnetic force of a magnet.

  In order to solve the above problem, the invention according to claim 1 includes a magnet magnetic pole portion having a magnet and a pseudo magnetic pole portion that functions as a magnetic pole opposite to the magnet magnetic pole portion by the magnetic action of the magnet. A rotor core in which a plurality of core blocks formed by combining these three are connected to each other via a magnetoresistive portion, and a rotating shaft provided on the rotor core so as to be integrally rotatable, the magnet magnetic pole portion of each core block Are the same number and have different polarities, and the magnet magnetic pole portions and the pseudo magnetic pole portions are arranged on the outer peripheral portion of the rotor core so as to be alternately different polarities in the circumferential direction.

  In the present invention, if the number of magnet magnetic pole portions (the number of magnets) in each core block is 1, the number of magnets is 1/3 of the number of magnetic poles of the entire rotor. That is, since the magnetic force of one magnet is applied to the two pseudo magnetic pole portions, it is possible to appropriately utilize the magnetic force of the magnet when using a magnet having a strong magnetic force. On the other hand, when the number of magnet magnetic pole portions of each core block is two, the number of magnets is 2/3 of the total number of magnetic poles of the rotor. In other words, since the magnetic force of the two magnets is applied to one pseudo magnetic pole portion, the pseudo magnetic pole portion can sufficiently function as a magnetic pole even when a magnet having a weak magnetic force is used. Therefore, it is possible to appropriately utilize the magnetic force in both cases of a magnet having a strong magnetic force and a magnet having a weak magnetic force, while the number of magnets is smaller than the number of magnetic poles of the entire rotor.

  According to a second aspect of the present invention, in the rotor according to the first aspect, in each of the core blocks, the magnet magnetic pole portion and the pseudo magnetic pole portion are arranged side by side so as to be adjacent to each other in the circumferential direction of the rotating shaft. It is characterized by.

In this invention, since the magnet magnetic pole part and the pseudo magnetic pole part are adjacent to each other in each core block, it is not necessary to make the core block into a complicated shape, and a simple configuration can be achieved.
According to a third aspect of the present invention, in the rotor according to the second aspect, in each of the core blocks, the pseudo magnetic pole portions are disposed on both sides in the circumferential direction of the one magnetic magnetic pole portion. .

In the present invention, when there is one magnet magnetic pole part, the magnet magnetic pole part and the pseudo magnetic pole part can be configured to have different polarities alternately in the circumferential direction.
According to a fourth aspect of the present invention, in the rotor according to the second aspect, in each of the core blocks, the pseudo magnetic pole portion is arranged between the circumferential directions of the two magnet magnetic pole portions. .

In the present invention, when there are two magnet magnetic pole portions, the magnet magnetic pole portion and the pseudo magnetic pole portion can be configured to have different polarities alternately in the circumferential direction.
According to a fifth aspect of the present invention, in the rotor according to any one of the first to fourth aspects, the magnetoresistive portion is made of a non-magnetic material.

  In this invention, the magnetic flux (leakage magnetic flux) which flows between each core block can be suppressed. Thereby, the magnetic force of a magnet can be used effectively, As a result, the fall of a motor output can be suppressed.

  According to a sixth aspect of the present invention, in the rotor according to any one of the first to fifth aspects, the core blocks are fixed to the rotating shaft and separated from each other by a gap. Features.

  In this invention, since each core block is mutually separated by the space | gap part, the magnetic flux (leakage magnetic flux) which flows between each core block can be suppressed. Thereby, the magnetic force of a magnet can be used effectively, As a result, the fall of a motor output can be suppressed.

  According to a seventh aspect of the present invention, in the rotor according to the sixth aspect, the rotating shaft is made of a nonmagnetic material and is configured as the magnetoresistive portion that connects the core blocks. .

  In this invention, since the rotating shaft which connects each core block consists of nonmagnetic materials, the quantity of the magnetic flux which flows between each core block can be suppressed more, and, as a result, the fall of a motor output can be suppressed more.

  According to an eighth aspect of the present invention, in the rotor according to any one of the first to seventh aspects, a plurality of the rotor cores having the same number of core blocks are arranged in parallel in the axial direction of the rotating shaft. The circumferential direction position of the magnet magnetic pole portion is configured to be different in each rotor core, and the magnet magnetic pole portion and the pseudo magnetic pole portion having the same polarity are configured to be aligned in the axial direction. To do.

  In this invention, in consideration of the magnetic imbalance between the magnet magnetic pole portion and the pseudo magnetic pole portion in one rotor core, the circumferential position of the magnet magnetic pole portion is different for each rotor core. Can be improved.

  According to a ninth aspect of the present invention, in the rotor according to the eighth aspect, the number of the rotor cores arranged in parallel in the axial direction of the rotating shaft is three, and the number of the magnet magnetic pole portions in each of the rotor cores is It is characterized by equal construction.

In this invention, since the number of magnet magnetic pole portions for each magnetic pole of the rotor becomes equal, the circumferential magnetic balance in the entire rotor can be further improved.
According to a tenth aspect of the present invention, in the rotor according to the eighth aspect, the number of the rotor cores arranged in parallel in the axial direction of the rotating shaft is two, and one of the rotor cores is provided for each core block. One magnet magnetic pole part is provided, and the other rotor core has two magnet magnetic pole parts for each core block.

  In the present invention, the number of rotor cores arranged in the axial direction is reduced to the smallest two, and the number of magnet magnetic pole portions for each magnetic pole of the rotor becomes equal, so that the magnetic balance in the circumferential direction of the entire rotor is reduced. It can be improved further.

An eleventh aspect of the invention is a motor including the rotor according to any one of the first to tenth aspects.
In the present invention, a motor capable of appropriately utilizing the magnetic force of the magnet of the rotor can be provided.

  Therefore, according to the above-described invention, it is possible to appropriately utilize the magnetic force of the magnet.

Sectional drawing of the motor of embodiment. The top view of the rotor of the same form. The top view of the rotor of another example. The perspective view of the rotor of another example. (A) The top view of the 1st rotor core in the rotor of another example, (b) The top view of the 2nd rotor core in the same rotor, (c) The top view of the 3rd rotor core in the same rotor. (A) The top view of the 1st rotor core in the rotor of another example, (b) The top view of the 2nd rotor core in the same rotor, (c) The top view of the 3rd rotor core in the same rotor. Explanatory drawing for demonstrating the rotor of another example. The perspective view of the rotor of another example. The disassembled perspective view of the rotor of another example.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
As shown in FIG. 1, the motor 10 of the present embodiment includes an annular stator 12 supported by a motor case 11 and a rotor 13 disposed inside the stator 12. The rotating shaft 14 of the rotor 13 is supported by a pair of bearings 15 and 16 provided in the motor case 11. The stator 12 includes a substantially cylindrical stator core 17 fixed to the inner surface of the motor case 11 and a coil 18 wound around the stator core 17. When a current is supplied to the coil 18, the rotor 13 rotates according to the rotating magnetic field generated by the stator 12.

  As shown in FIG. 2, the rotor 13 includes a rotating shaft 14 and a rotor core 20 that are integrally provided. The rotor core 20 includes a first core block 21, a second core block 22, and a magnetoresistive portion 23 that connects the first and second core blocks 21 and 22. The rotating shaft 14 is made of a magnetic material and has a cylindrical shape. The magnetoresistive portion 23 is made of a nonmagnetic material such as resin, and magnetically insulates the first and second core blocks 21 and 22 from each other. The magnetoresistive portion 23 has a substantially rhombus shape, and the rotating shaft 14 is inserted and fixed at the center thereof. That is, the magnetoresistive portion 23 is configured to be interposed between the rotating shaft 14 and the first and second core blocks 21 and 22 and magnetically insulates between them.

  The first core block 21 is made of a magnetic material such as metal. Specifically, the first core block 21 is formed by laminating a plurality of plate members made of a magnetic material such as metal in the axial direction of the rotating shaft 14 and caulking them together. The radially inner side surface of the first core block 21 is a fixing surface 24 for the magnetoresistive portion 23, and the fixing surface 24 has a shape corresponding to the side shape of the magnetoresistive portion 23. The first core block 21 is fixed to the magnetoresistive portion 23 so that the corner portion of the magnetoresistive portion 23 is positioned at the circumferential center of the first core block 21.

  One magnet magnetic pole portion 25 and pseudo magnetic pole portions 26 located on both sides in the circumferential direction are integrally formed on the outer peripheral portion of the first core block 21. The magnet magnetic pole portion 25 is formed so as to protrude radially outward at the circumferential central portion of the first core block 21, and a magnet 27a is embedded in the protruding portion. On the other hand, the pseudo magnetic pole portion 26 is formed to protrude radially outward at both circumferential ends of the first core block 21. The angle from the circumferential center of the magnet magnetic pole portion 25 to the circumferential center of each pseudo magnetic pole portion 26 is set to 60 degrees. The circumferential width of the magnet magnetic pole portion 25 and the circumferential width of each pseudo magnetic pole portion 26 are set to be approximately equal. And the outer peripheral surface of the magnet magnetic pole part 25 and the outer peripheral surface of each pseudo magnetic pole part 26 are located on the same circle centering on the axis line of the rotating shaft 14 seeing from the axial direction. The magnet 27 a embedded in the magnet magnetic pole portion 25 has a rectangular parallelepiped shape that is long in the axial direction of the rotating shaft 14, and the axial length thereof is equal to the axial length of the first core block 21.

  The second core block 22 has the same shape as the first core block 21, and the rotor 13 is configured to be point symmetric with respect to the axis of the rotating shaft 14. In the second core block 22, the same components as those in the first core block 21 are denoted by the same reference numerals, and detailed description thereof is omitted. The magnet magnetic pole part 25 and the pseudo magnetic pole part 26 of each of the core blocks 21 and 22 are configured such that their circumferential centers are equally spaced (60 degree intervals in the present embodiment). Further, the outer peripheral surfaces of the magnet magnetic pole part 25 and the pseudo magnetic pole part 26 are located on the same circle centered on the axis of the rotary shaft 14 when viewed from the axial direction.

  Next, the magnets 27a and 27b of the core blocks 21 and 22 will be described. In FIG. 2, the flow of magnetic flux of each of the magnets 27a and 27b is schematically shown by broken lines. The magnet 27a of the first core block 21 is magnetized so that the radially outer side is an N pole and the radially inner side is an S pole. Thereby, the polarity of the outer peripheral surface of the magnet magnetic pole part 25 of the 1st core block 21 turns into N pole. And each pseudo magnetic pole part 26 of the 1st core block 21 functions as a south pole by the magnetic action of this magnet 27a.

  The magnet 27 b of the second core block 22 has the same shape as the magnet 27 a of the first core block 21. The magnet 27b is magnetized so that the radially outer side is the S pole and the radially inner side is the N pole, contrary to the magnet 27a of the first core block 21. Thereby, the polarity of the outer peripheral surface of the magnet magnetic pole portion 25 of the second core block 22 becomes the S pole. And each pseudo magnetic pole part 26 of the 2nd core block 22 functions as a south pole by the magnetic action of this magnet 27b. With such a configuration, the magnetic poles on the outer peripheral portion of the rotor 13 are composed of six poles in which the north and south poles are alternately arranged in the circumferential direction.

Next, the operation of this embodiment will be described.
In the rotor 13 as described above, the number of magnet magnetic pole portions 25 of each core block 21, 22 (the number of magnets 27 a (or magnets 27 b)) is one. Therefore, the number of magnets 27 a and 27 b in the entire rotor 13. Becomes two, which is 1/3 of the total number of magnetic poles of the rotor 13 (six poles). As a result, the number of magnets 27a and 27b is smaller than that of a half magnet type rotor (a rotor having half the number of magnetic poles with respect to the number of magnetic poles), which is advantageous in terms of reducing the number of parts and cost. is there. In the rotor 13 of the present embodiment, the magnetic force of one magnet 27a (or magnet 27b) is applied to the two pseudo magnetic pole portions 26 on both sides in the circumferential direction, so that a rare earth with strong magnetic force is applied to the magnets 27a and 27b. When using a magnet (for example, a neodymium magnet) or the like, the magnetic force of the magnets 27a and 27b can be appropriately utilized.

Next, characteristic effects of the present embodiment will be described.
(1) The rotor core 20 has one magnet magnetic pole part 25 having a magnet 27a (magnet 27b) and two pseudo magnetic pole parts that function as a magnetic pole opposite to the magnet magnetic pole part 25 by the magnetic action of the magnet 27a (magnet 27b). 26 are provided with first and second core blocks 21 and 22. The first and second core blocks 21 and 22 are connected to each other via a magnetoresistive portion 23. The magnet magnetic pole portions 25 of the core blocks 21 and 22 have the same number and different polarities, and the magnetic magnetic pole portions 25 and the pseudo magnetic pole portions 26 are outer peripheral portions of the rotor core 20 so as to be alternately different polarities in the circumferential direction. Placed in. Thereby, the number of magnets 27a and 27b in the entire rotor 13 is two, that is, 1/3 of the number of magnetic poles in the entire rotor 13 (six poles). That is, since the magnetic force of one magnet 27a (or magnet 27b) is applied to the two pseudo magnetic pole portions 26, when a rare earth magnet having a strong magnetic force is used for the magnets 27a and 27b, the magnets 27a and 27b It becomes possible to utilize magnetic force appropriately.

  Further, since the half magnet type rotor has a single magnet polarity, there is a possibility that one polarity is stronger than the other polarity and the balance becomes worse, but the rotor 13 of the present embodiment has two magnets 27a. 27b have different polarities from each other, the balance of the strength of the N pole and the S pole can be improved as compared with the half magnet rotor.

  (2) Since the magnet magnetic pole portion 25 and the pseudo magnetic pole portion 26 are arranged side by side in the circumferential direction of the rotating shaft 14 in each core block 21, 22, each core block 21, 22 has a complicated shape. There is no need, and a simple configuration can be achieved.

  (3) In each core block 21, 22, the pseudo magnetic pole portions 26 are arranged on both sides in the circumferential direction of one magnet magnetic pole portion 25, so that the magnet magnetic pole portions 25 of each core block 21, 22 are combined into one. The magnet magnetic pole portion 25 and the pseudo magnetic pole portion 26 can be configured to have different polarities alternately in the circumferential direction.

  (4) Since the magnetoresistive portion 23 is made of a non-magnetic material (resin in this embodiment), the magnetic flux (leakage magnetic flux) flowing between the core blocks 21 and 22 can be suppressed. Thereby, the magnetic force of magnet 27a, 27b can be used effectively, As a result, the fall of the output of the motor 10 can be suppressed.

In addition, you may change embodiment of this invention as follows.
In the above embodiment, the rotor core 20 includes the first and second core blocks 21 and 22 one by one. However, the present invention is not particularly limited thereto, and the first and second core blocks 21 and 22 are respectively provided. It is good also as a structure provided with two or more.

  In the above embodiment, each of the core blocks 21 and 22 is configured by arranging the pseudo magnetic pole portions 26 on both sides in the circumferential direction of one magnet magnetic pole portion 25. However, the present invention is not particularly limited to this. A configuration may be adopted in which one pseudo magnetic pole portion is disposed between the circumferential directions of two magnet magnetic pole portions.

  For example, in the rotor 13A shown in FIG. 3, the rotor core 30 includes a first core block 31, a second core block 32, and a magnetoresistive portion 23 having the same configuration as that of the above embodiment. Each of the core blocks 31 and 32 has a configuration in which the magnet magnetic pole portion 25 and the pseudo magnetic pole portion 26 of each of the core blocks 21 and 22 of the above embodiment are replaced. That is, each of the core blocks 31 and 32 has one pseudo magnetic pole portion 36 at the center in the circumferential direction, and has magnet magnetic pole portions 35 on both sides in the circumferential direction. In the configuration shown in FIG. 3, the circumferential width of each magnet magnetic pole portion 35 and the circumferential width of each pseudo magnetic pole portion 36 are all set equal.

  The magnets 37a provided in the magnet magnetic pole portions 35 of the first core block 31 are magnetized so that the radially outer side is the S pole and the radially inner side is the N pole. Thereby, the polarity of the outer peripheral surface of each magnet magnetic pole part 35 of the 1st core block 31 turns into an S pole. The pseudo magnetic pole portion 36 of the first core block 31 functions as an N pole by the magnetic action of the magnet 37a.

  Contrary to the magnet 37a of the first core block 31, the magnet 37b provided in each magnet magnetic pole portion 35 of the second core block 32 is attached so that the radially outer side is the N pole and the radially inner side is the S pole. It is magnetized. Thereby, the polarity of the outer peripheral surface of each magnet magnetic pole part 35 of the 2nd core block 32 turns into N pole. The pseudo magnetic pole portion 36 of the second core block 32 functions as an N pole by the magnetic action of the magnet 37b.

  According to such a configuration, since the number of magnet magnetic pole portions 35 of each core block 31 and 32 (the number of magnets 37a (or magnets 37b)) is two, the number of magnets 37a and 37b in the entire rotor 13A. Is four, which is 2/3 of the total number of magnetic poles (six poles) of the rotor 13A. Thus, the number of magnets 37a and 37b is smaller than that of a full magnet type rotor (a rotor having the same number of magnetic poles and magnets), which is advantageous in terms of the number of parts and cost. In the rotor 13A of this configuration, since the magnetic force of the two magnets 37a (or the magnet 37b) is applied to one pseudo magnetic pole portion 36 between the circumferential directions, the magnets 37a and 37b have a weak magnetic force. In the case of using a magnet or the like, the pseudo magnetic pole portion 36 can sufficiently function as a magnetic pole by appropriately utilizing the magnetic force of the magnets 37a and 37b. Further, in the configuration as shown in FIG. 3, since the pseudo magnetic pole portion 36 is disposed between the two magnet magnetic pole portions 35 in the respective core blocks 31 and 32, the magnet magnetic poles of the core blocks 31 and 32. Although the number of the portions 35 is two, the magnet magnetic pole portion 35 and the pseudo magnetic pole portion 36 can be configured to have different polarities alternately in the circumferential direction.

  In the above embodiment, the rotor 13 is configured to include one rotor core 20, but is not particularly limited to this, and a configuration in which a plurality of rotor cores 20 are arranged in parallel in the axial direction of the rotating shaft 14. Also good. For example, in the rotor 13B shown in FIGS. 4 and 5A, 5B, and 5C, the first rotor core 20a, the second rotor core 20b, and the third rotor core 20c are arranged in parallel in the axial direction of the rotary shaft 14 with a gap. The rotor cores 20a, 20b, 20c and the rotary shaft 14 are fixed so as to be rotatable together. In the configuration shown in FIGS. 4 and 5, a gap is provided between the axial directions of the rotor cores 20a, 20b, and 20c. For example, magnetic leakage between the rotor cores 20a, 20b, and 20c is interposed between the axial directions. A magnetoresistive portion such as a resin for suppressing the above may be interposed. Since the first to third rotor cores 20a, 20b, and 20c have the same configuration as the rotor core 20 of the above-described embodiment, the same reference numerals are given to the same configurations, and detailed descriptions thereof are omitted. The circumferential width of the magnet magnetic pole portion 25 of each rotor core 20a, 20b, 20c and the circumferential width of each pseudo magnetic pole portion 26 are all set equal. In addition, the magnetoresistive portion 23 may be individually provided in each of the first to third rotor cores 20a, 20b, and 20c, or one magnetoresistor formed over the first to third rotor cores 20a, 20b, and 20c. The unit 23 may be configured.

  The rotor cores 20a, 20b, and 20c are configured to be shifted from each other by 120 degrees in the circumferential direction. Thereby, the magnet magnetic pole portion 25 of the first core block 21 of the first rotor core 20a is changed to the pseudo magnetic pole portion 26 of the second core block 22 of the second rotor core 20b and the pseudo magnetic pole portion of the second core block 22 of the third rotor core 20c. It is aligned with the portion 26 in the axial direction. Further, the magnet magnetic pole portion 25 of the second core block 22 of the first rotor core 20a includes the pseudo magnetic pole portion 26 of the first core block 21 of the second rotor core 20b and the pseudo magnetic pole portion of the first core block 21 of the third rotor core 20c. 26 is aligned in the axial direction. That is, each magnet magnetic pole portion 25 of the first rotor core 20a is aligned in the axial direction with the pseudo magnetic pole portion 26 of the same polarity in the second and third rotor cores 20b and 20c. Similarly, in the second rotor core 20b, the magnet magnetic pole portions 25 of the core blocks 21 and 22 are aligned in the axial direction with the pseudo magnetic pole portions 26 of the same polarity in the first and third rotor cores 20a and 20c. Similarly, in the third rotor core 20c, the magnet magnetic pole portions 25 of the core blocks 21 and 22 are aligned in the axial direction with the pseudo magnetic pole portions 26 of the same polarity in the first and second rotor cores 20a and 20b. In the rotor 13B configured as described above, one magnet magnetic pole portion 25 and two pseudo magnetic pole portions 26 having the same polarity are arranged in the axial direction to form a magnetic pole portion, and the magnetic pole portion has an N pole in the circumferential direction. S poles are arranged alternately.

  Here, in the configuration with only one rotor core 20 as in the above-described embodiment, the magnetic magnetic force portion 25 and the pseudo magnetic pole portion 26 have different magnetic force forcing, so magnetic imbalance is likely to occur in the circumferential direction. There is a risk of cogging torque. On the other hand, in the configuration shown in FIG. 4 and FIG. 5 described above, the magnetic pole portion is considered in consideration of the magnetic imbalance between the magnetic pole portion 25 and the pseudo magnetic pole portion 26 in each rotor core 20a, 20b, 20c. Since the circumferential position of 25 is different in each rotor core 20, the circumferential magnetic balance in the whole rotor 13B can be improved. Further, in the configuration shown in FIGS. 4 and 5, since the three rotor cores 20a, 20b, and 20c having the same configuration are stacked in the axial direction, the number of magnet magnetic pole portions 25 in each magnetic pole of the rotor is the same. As a result, the magnetic balance in the circumferential direction in the entire rotor 13B can be further improved.

  In the configuration shown in FIG. 4 and FIG. 5 described above, the rotor core 20 of the above-described embodiment (a configuration in which the magnet magnetic pole portion 25 is provided in each of the first and second core blocks 21 and 22) is arranged in the axial direction. However, for example, the rotor core 30 having the configuration shown in FIG. 3 (a configuration in which two magnet magnetic pole portions 25 are provided in each of the first and second core blocks 21 and 22) may be arranged in the axial direction. .

  For example, the first rotor core 30a, the second rotor core 30b, and the third rotor core 30c shown in FIGS. 6A, 6B, and 6C have the same configuration as the rotor core 30 shown in FIG. 30b and 30c are laminated in the axial direction. The rotor cores 30a, 30b, and 30c are configured to be shifted from each other by 120 degrees in the circumferential direction, similarly to the configuration shown in FIGS. That is, two magnet magnetic pole parts 35 of the same polarity and one pseudo magnetic pole part 36 are arranged in the axial direction to constitute a magnetic pole part, and the magnetic pole part is constituted by alternately arranging N poles and S poles in the circumferential direction. It has become. Even with such a configuration, the same effect as the configuration shown in FIGS. 4 and 5 can be obtained.

  In addition to the above example, for example, as shown in FIG. 7, the rotor core 20 of the above embodiment and the rotor core 30 shown in FIG. 3 may be arranged in the axial direction. In the rotor 13C shown in FIG. 7, the rotor core 20 and the rotor core 30 are laminated one by one. As for each rotor core 20 and 30, while the 1st core blocks 21 and 31 are laminated | stacked on an axial direction, each 2nd core blocks 22 and 32 are laminated | stacked on the axial direction. Specifically, each magnet magnetic pole portion 25 of one rotor core 20 is aligned with the pseudo magnetic pole portion 36 of the same polarity of the other rotor core 30 in the axial direction. Each pseudo magnetic pole portion 36 of one rotor core 20 is aligned with the magnet magnetic pole portion 25 of the same polarity of the other rotor core 30 in the axial direction. In the rotor 13C configured as described above, the magnetic pole part 25 (magnet magnetic pole part 35) and the pseudo magnetic pole part 36 (pseudo magnetic pole part 26) having the same polarity constitute the magnetic pole part side by side in the axial direction. The magnetic pole portion has a configuration in which N poles and S poles are alternately arranged in the circumferential direction.

  According to such a configuration, in consideration of the magnetic imbalance between the magnet magnetic pole part 25 (magnet magnetic pole part 35) and the pseudo magnetic pole part 26 (pseudo magnetic pole part 36) in each of the rotor cores 20 and 30, the magnet magnetic pole part. Since the circumferential position of 25 is different for each rotor core 20, the circumferential magnetic balance in the entire rotor 13C can be improved. Furthermore, since two rotor cores 20 and 30 having different numbers of magnet magnetic pole portions 25 and 35 are laminated in the axial direction, the number of rotor cores 20 and 30 arranged in the axial direction is reduced to the smallest two. Although the cost is reduced, the number of magnet magnetic pole portions 25 and 35 in each magnetic pole of the rotor becomes equal, and as a result, the circumferential magnetic balance in the entire rotor 13C can be further improved.

In the configuration shown in FIGS. 4, 6, and 7, two or three rotor cores are arranged in the axial direction, but four or more rotor cores may be arranged.
In the above embodiment, the first and second core blocks 21 and 22 are connected to each other by the magnetoresistive portion 23 made of a non-magnetic material such as resin, and the rotating shaft 14 is inserted and fixed to the magnetoresistive portion 23. However, it is not particularly limited to this configuration. For example, in the rotor 13D shown in FIGS. 8 and 9, the first core block 41 and the second core block 42 constituting the rotor core 40 have the same shape as each other, and have a shape obtained by dividing the cylinder into approximately half. . One magnet magnetic pole portion 45 and pseudo magnetic pole portions 46 positioned on both sides in the circumferential direction are integrally formed on the outer peripheral portion of each core block 41, 42. The magnet magnetic pole portion 45 is formed so as to protrude outward in the radial direction at the central portion in the circumferential direction of the outer peripheral portion of each core block 41, 42. The pseudo magnetic pole portion 46 is formed so as to protrude radially outward at both circumferential ends of the core blocks 41 and 42. The magnet magnetic pole part 45 and the pseudo magnetic pole part 46 are configured such that their circumferential centers are equally spaced (60 degree intervals).

  A magnet 47 a is embedded in the magnet magnetic pole portion 45 of the first core block 41. As with the magnet 27a of the above embodiment, the magnet 47a is magnetized so that the radially outer side is an N pole and the radially inner side is an S pole. Thereby, the polarity of the outer peripheral surface of the magnet magnetic pole part 45 of the first core block 41 becomes the N pole. And each pseudo magnetic pole part 46 of the 1st core block 41 functions as a south pole by the magnetic action of this magnet 47a. On the other hand, the magnet 47b embedded in the magnet magnetic pole portion 45 of the second core block 42 is opposite to the magnet 47a of the first core block 41 so that the radially outer side is the S pole and the radially inner side is the N pole. Magnetized. Thereby, the polarity of the outer peripheral surface of the magnet magnetic pole portion 45 of the second core block 42 is the S pole. And each pseudo magnetic pole part 46 of the 2nd core block 42 functions as a south pole by the magnetic effect | action of this magnet 47b. With such a configuration, the magnetic poles on the outer peripheral portion of the rotor core 40 are composed of six poles in which the north and south poles are alternately arranged in the circumferential direction.

  A ring-shaped fixing portion 43 a is integrally formed at one axial end portion (the upper end portion in FIG. 9) of the first core block 41. On the other hand, a ring-shaped fixing portion 43 b similar to the fixing portion 43 a of the first core block 41 is integrally formed at the other axial end portion (the lower end portion in FIG. 9) of the second core block 42. A rotary shaft 44 is press-fitted and fixed to each of the fixing portions 43a and 43b, whereby the core blocks 41 and 42 and the rotary shaft 44 are fixed so as to be integrally rotatable. A gap 48 extending in the radial direction of the rotating shaft 44 is formed between the core blocks 41 and 42. That is, the core blocks 41 and 42 are separated from each other (non-contact configuration) and are connected via the rotation shaft 44. The rotating shaft 44 is made of a non-magnetic material such as stainless steel, whereby the magnetic flux (leakage magnetic flux) passing through the rotating shaft 44 via the fixed portions 43a and 43b is suppressed to a small value. Moreover, since the axial thickness of each fixing | fixed part 43a, 43b is formed sufficiently thin with respect to the axial direction thickness of each core block 41, 42, this each fixing | fixed part 43a, 43b also becomes a magnetic resistance. Therefore, in this configuration, the rotating shaft 44 and the fixed portions 43a and 43b constitute a magnetoresistive portion.

  Even with such a configuration, it is possible to obtain the same effect as the above-described embodiment. Further, in the configuration shown in FIGS. 8 and 9, the core blocks 41 and 42 are directly fixed to the rotating shaft 44 and are separated from each other by the gap portion 48, so that there is a gap between the core blocks 41 and 42. The flowing magnetic flux (leakage magnetic flux) can be suppressed. Thereby, the magnetic force of magnet 47a, 47b can be utilized effectively, As a result, the fall of a motor output can be suppressed. Furthermore, since the rotating shaft 14 that connects the core blocks 41 and 42 is made of a nonmagnetic material and is configured as a magnetoresistive portion that connects the core blocks 41 and 42, the magnetic flux that flows between the core blocks 41 and 42. As a result, a decrease in motor output can be further suppressed.

  In the configuration shown in FIGS. 8 and 9, the fixing portions 43 a and 43 b are configured one by one. However, the configuration is not particularly limited to this, and each of the first and second core blocks 41 and 42 has two. Two or more may be provided. According to this, the fixed strength to the rotating shaft 44 of each core block 41 and 42 can be improved.

  In the above embodiment, the circumferential width of the magnet magnetic pole portion 25 and the circumferential width of the pseudo magnetic pole portion 26 are set to be approximately equal. However, the circumferential width of the pseudo magnetic pole portion 26 is set to be larger than the circumferential width of the magnet magnetic pole portion 25. May be set smaller or larger.

In the above embodiment, the rotating shaft 14 is made of a magnetic material, but may be a non-magnetic material (for example, stainless steel).
In the above embodiment, the first and second core blocks 21 and 22 are separated from each other. However, the present invention is not particularly limited thereto, and the first and second core blocks 21 and 22 may be integrally formed. Good. In this case, the 1st and 2nd core blocks 21 and 22 are set as the structure mutually connected via the connection part integrally formed in them. Since the gap between the core blocks 21 and 22 is increased by making the cross-sectional area of the connecting portion small, the connecting portion functions as a magnetoresistive portion.

  In the embodiment described above, a gap is formed between the magnet magnetic pole part 25 and the pseudo magnetic pole part 26 in each core block 21, 22, but the gap may be omitted.

  In the above embodiment, the magnets 27 a and 27 b are configured as IPM type rotors embedded in the core blocks 21 and 22 (magnet magnetic pole portions 25), but the magnets 27 a and 27 b are arranged on the outer peripheral surface of the magnet magnetic pole portion 25. It may be configured as an SPM type rotor.

  In the above embodiment, the magnet magnetic pole portion 25 and the pseudo magnetic pole portion 26 are adjacent to each other in the circumferential direction in each of the core blocks 21 and 22, that is, constitute three magnetic poles continuous in the circumferential direction. It is not limited. For example, the magnet magnetic pole part and the pseudo magnetic pole part may have a claw shape extending in the axial direction, and the magnet magnetic pole part and the pseudo magnetic pole part may constitute three magnetic poles that are not continuous in the circumferential direction.

  DESCRIPTION OF SYMBOLS 10 ... Motor, 12 ... Stator, 13, 13A, 13B, 13C, 13D ... Rotor, 14, 44 ... Rotary shaft, 20, 30, 40 ... Rotor core, 20a, 30a ... First rotor core, 20b, 30b ... Second rotor core 20c, 30c ... 3rd rotor core, 21, 31, 41 ... 1st core block, 22, 32, 42 ... 2nd core block, 23 ... Magnetoresistive part, 25, 35, 45 ... Magnet magnetic pole part, 26, 36 , 46 ... pseudo magnetic pole part, 27a, 27b, 37a, 37b, 47a, 47b ... magnet, 43a, 43b ... fixed part constituting the magnetic resistance part, 44 ... rotating shaft constituting the magnetic resistance part, 48 ... gap part.

Claims (11)

A plurality of core blocks each having a magnet magnetic pole part having a magnet and a pseudo magnetic pole part that functions as a magnetic pole opposite to the magnet magnetic pole part by the magnetic action of the magnet are combined via the magnetoresistive part. Rotor cores connected to each other,
A rotation shaft provided to the rotor core so as to be integrally rotatable,
The magnet magnetic pole portions of each of the core blocks are the same number and different in polarity,
The rotor, wherein the magnet magnetic pole part and the pseudo magnetic pole part are arranged on an outer peripheral part of the rotor core so as to have different polarities alternately in a circumferential direction. The rotor according to claim 1, wherein
The rotor, wherein the magnet magnetic pole part and the pseudo magnetic pole part are arranged side by side in the circumferential direction of the rotating shaft in each core block. The rotor according to claim 2, wherein
In each of the core blocks, the pseudo magnetic pole portion is disposed on each side of the magnet magnetic pole portion in the circumferential direction. The rotor according to claim 2, wherein
In each of the core blocks, the pseudo magnetic pole part is disposed between the circumferential directions of the two magnet magnetic pole parts. The rotor according to any one of claims 1 to 4,
The rotor according to claim 1, wherein the magnetoresistive portion is made of a non-magnetic material. The rotor according to any one of claims 1 to 5,
Each of the core blocks is fixed to the rotating shaft and separated from each other by a gap. The rotor according to claim 6, wherein
The rotor is characterized in that the rotating shaft is made of a non-magnetic material and is configured as the magnetoresistive portion that connects the core blocks. The rotor according to any one of claims 1 to 7,
A plurality of the rotor cores having the same number of core blocks are juxtaposed in the axial direction of the rotating shaft,
The rotor is configured such that the circumferential position of the magnet magnetic pole portion is different in each rotor core, and the magnet magnetic pole portion and the pseudo magnetic pole portion having the same polarity are arranged in the axial direction. . The rotor according to claim 8, wherein
The number of the rotor cores arranged side by side in the axial direction of the rotating shaft is three,
The rotor is characterized in that the number of magnet magnetic pole portions in each rotor core is equal. The rotor according to claim 8, wherein
The number of the rotor cores arranged side by side in the axial direction of the rotating shaft is two,
One of the rotor cores has one magnet magnetic pole portion for each core block,
The other rotor core has two magnet magnetic pole portions for each core block.   A motor comprising the rotor according to claim 1.