JP2015073343A - Rotary electric machine and hoist for elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine capable of reducing leakage magnetic flux between magnetic poles of a rotor regardless of an embedded permanent magnet rotor structure, and also to provide a hoist for an elevator.SOLUTION: A unit magnetic pole unit constituting a magnetic pole of a rotor 3 is constituted of permanent magnets 41, 42, and a magnetic pole yoke 32a having magnetic housing holes 32h1, 32h2 for housing and holding the permanent magnets 41, 42 and being composed of a magnetic material separately from a rotor yoke 31. A rotary electric machine is provided which is retained on the outer peripheral surface of the rotor yoke 31 by being separated at a prescribed interval in the circumferential direction of the rotor yoke 31.

Description

  The present invention relates to a rotating electric machine that is used as, for example, a motor or a generator and includes a permanent magnet in a rotor that rotates with respect to a stator, and an elevator hoisting machine including the rotating electric machine.

  Conventionally, a rotary electric machine (embedded magnet type rotary electric machine) in which a plurality of permanent magnets are embedded in a rotor yoke by providing a plurality of holes for permanent magnets in the rotor yoke and inserting the permanent magnets into the holes for each permanent magnet is known. (For example, Patent Document 1). There has also been proposed a rotating electrical machine in which a plurality of yokes are joined to form an annular rotor yoke, and a rotor is configured by filling a plurality of permanent magnets in the rotor yoke (for example, Patent Document 2).

JP 2010-142032 A JP 2008-259359 A

  In the rotating electrical machines using the conventional embedded magnet type rotors disclosed in Patent Documents 1 and 2, demagnetization of the permanent magnet due to the demagnetizing field of the stator is mitigated, but it is necessary to provide a hole for the permanent magnet in the rotor yoke. is there. In particular, when the rotor yoke is a casting, for example, when the permanent magnet has a rectangular shape, it is difficult to cut the hole for embedding the permanent magnet in accordance with the shape of the permanent magnet, and the processing time is greatly reduced. (If the hole width is small or the inner corner radius is small, it is necessary to process with a small blade). Moreover, the case where it carries out by electric discharge machining similarly had the subject that the effort of a process will become extremely large.

  Further, since each permanent magnet is embedded in the rotor yoke (embedded magnet type), there is a problem that the leakage magnetic flux between the magnetic poles increases and the output torque of the rotating electrical machine decreases.

  In the case of these rotating electric machines, it is common to secure the safety and reliability of the embedding work of each permanent magnet by embedding each permanent magnet in the rotor yoke and fixing the permanent magnet. It has become. For this reason, it is necessary to magnetize each permanent magnet forming a plurality of magnetic poles, and the magnetization of each permanent magnet may be incomplete. This becomes a demagnetizing factor of the permanent magnet that proceeds from the unmagnetized region, and there is a problem that the reliability of the rotating electrical machine is lowered.

  In addition, the structure of the magnetizing yoke used for magnetizing is complicated and expensive, which increases the manufacturing cost of the rotating electrical machine. Furthermore, the rotating electrical machine disclosed in Patent Document 2 has a problem in that when a rotor yoke is manufactured, a step of joining a plurality of yokes is required, which further increases the effort for manufacturing the rotating electrical machine.

  The present invention has been made to solve the above-described problems, and can provide a rotating electrical machine and an elevator hoisting machine that can suppress demagnetization of a permanent magnet and have high reliability and high productivity. Objective.

The rotating electrical machine according to this invention is
A stator having a stator core having a plurality of magnetic pole teeth protruding from the annular back yoke to the radially inner periphery of the back yoke, and an armature coil provided on the stator core;
A rotor yoke that is rotatably provided so as to be opposed to the inner peripheral side tips of the plurality of magnetic teeth portions, and extends in the axial direction of the rotor yoke. In a rotating electrical machine composed of a rotor having a plurality of permanent magnets arranged in the circumferential direction of the rotor yoke to form,
The unit magnetic pole unit constituting the magnetic pole of the rotor is composed of the permanent magnet and a magnetic pole yoke made of a magnetic material separate from the rotor yoke, which has a magnet housing hole for housing and holding the permanent magnet. ,
The unit magnetic pole units are held on the outer peripheral surface of the rotor yoke at a predetermined interval in the circumferential direction of the rotor yoke.

  An elevator hoisting machine according to the present invention includes the above-described rotating electric machine that drives an elevator car.

  According to the rotating electrical machine and elevator hoist according to the present invention, the unit magnetic pole unit in which the permanent magnet is embedded in the magnetic pole yoke is used as each magnetic pole of the rotor. Since the magnetic poles on the side are separated by air, the leakage magnetic flux between the magnetic poles can be reduced, and the efficiency of the rotating electrical machine and the elevator hoisting machine can be improved.

  Moreover, since the magnetization to each permanent magnet can be performed for every unit magnetic pole unit, the magnetization to each permanent magnet can be implemented reliably. As a result, it is possible to eliminate the unmagnetized region of each permanent magnet, and it is possible to improve the efficiency of the rotating electrical machine and suppress the demagnetization of the permanent magnet due to the demagnetizing field of the stator. An elevator hoist is obtained.

  Further, even if a casting is used as the material of the rotor yoke, the embedded magnet type rotor structure can be easily configured, so that the reluctance torque can be easily utilized and the efficiency of the rotating electrical machine and the elevator hoisting machine can be improved. Further, when the magnetic pole yoke is press-molded, the magnetic pole yoke can be punched with a small size of the unit magnetic pole unit, so that the material yield can be improved as compared with the case of punching in an annular shape or an arc shape. In addition, since the permanent magnet of the surface magnet type rotor structure can be changed to the embedded magnet type rotor structure by replacing it with the unit magnetic pole unit, the variation of the rotor structure can be easily changed, and the rotor with a different magnet arrangement structure can be easily changed. Production becomes possible.

It is sectional drawing of the rotary electric machine which concerns on Embodiment 1 of this invention. It is sectional drawing which cut | disconnected the rotary electric machine which concerns on Embodiment 1 of this invention by the XX line of FIG. It is a top view which shows the structure of the rotor of FIG. It is a principal part enlarged plan view of FIG. It is the top view and side view which show the unit magnetic pole unit which concerns on Embodiment 1 of this invention. It is a principal part enlarged plan view of the rotor which concerns on Embodiment 2 of this invention. It is a top view which shows the modification of the permanent magnet which concerns on Embodiment 3 of this invention. It is a principal part enlarged plan view of the rotor which concerns on Embodiment 4 of this invention. It is a principal part enlarged plan view of the rotor which concerns on Embodiment 5 of this invention. It is another example of the principal part enlarged plan view of the rotor which concerns on Embodiment 5 of this invention. It is a principal part enlarged plan view of the rotor which concerns on Embodiment 6 of this invention. It is a schematic diagram which shows the flow of the magnetic flux at the time of magnetization of a unit magnetic pole unit. It is a principal part enlarged plan view of the rotor based on Embodiment 7 of this invention. It is a principal part enlarged plan view which shows the other example of the rotor based on Embodiment 8 of this invention. It is a schematic diagram which shows the flow of the magnetic flux at the time of magnetization of a unit magnetic pole unit. It is a principal part enlarged plan view of the rotor which concerns on Embodiment 9 of this invention. It is a principal part enlarged plan view of the rotor which concerns on Embodiment 9 of this invention. It is the side view and principal part enlarged plan view of a rotor which concern on Embodiment 10 of this invention. It is sectional drawing of the elevator hoisting machine which concerns on Embodiment 11 of this invention.

Embodiment 1 FIG.
Hereinafter, the rotating electrical machine according to the first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of rotating electric machine 100 according to Embodiment 1 of the present invention.
2 is a cross-sectional view of the rotating electrical machine 100 taken along line XX of FIG.
FIG. 3 is a plan view showing the configuration of the rotor 3 shown in FIGS.
4 is an enlarged view of a main part of FIG.
FIG. 5 is a plan view and a side view showing the unit magnetic pole unit 32 according to the first embodiment.
In the following description, the terms “circumferential direction”, “radial direction”, and “axial direction” refer to the circumferential direction, radial direction, and axial direction of the rotor 3.

  The rotating electrical machine 100 includes a stator 2 and a rotor 3. The stator iron core 21 of the stator 2 includes an annular back yoke portion 21a and a magnetic pole tooth portion 21b that protrudes radially inward from the back yoke portion 21a. The magnetic pole tooth portion 21 b is provided with a drive coil 24 provided via an insulator 23. The stator 2 is fitted into a housing 7 having a support shaft 71 at the center. The rotor 3 is rotatably attached to the support shaft 71 via a bearing 9.

  The rotor 3 is disposed inside the stator 2 so as to face the magnetic pole tooth tip 21bs. The rotor 3 extends in the axial direction of the rotor yoke 31 with a predetermined interval between the rotor yoke 31 having a flywheel shape and the outer peripheral surface of the rotor yoke 31 facing the magnetic pole tooth tip 21bs so that the polarities are alternately different. The unit magnetic pole unit 32 is arranged in such a manner.

  The unit magnetic pole unit 32 is a separate body from the rotor yoke 31, and the magnetic pole yoke 32a and the permanent magnets 41 to 44 (a set of the permanent magnet 41 and the permanent magnet 42, or the set of the permanent magnet 43 and the permanent magnet 44). It consists of and. The magnetic pole yoke 32a is provided with magnet housing holes 32h1 and 32h2 for housing the permanent magnets 41 to 44, in which a set of two permanent magnets is housed and fixed. The magnetic pole yoke 32a is formed, for example, by laminating and fixing a plurality of cores press-formed from electromagnetic steel sheets. The side facing the magnetic pole tooth tip 21bs is an arc-shaped outer circumferential surface 32a1, and the back surface of the arc-shaped outer circumferential surface 32a1 is a planar mounting surface 32a2 that is a fixed portion to the rotor yoke 31.

  The permanent magnets 41 and 42 are symmetrical with respect to the radial axis AA passing through the axis of the support shaft 71 that is the rotation center of the rotor 3 and the center of the unit magnetic pole unit 32, and are viewed from the magnetic pole teeth portion 21b side. In this case, for example, two cross sections perpendicular to the axial direction of the rotor 3 are arranged so as to have a square shape. That is, as shown in FIG. 4, the end portions 41 a and 42 a that are one end on the end side in the circumferential direction of the unit magnetic pole unit of the two permanent magnets 41 and 42 are more than the end portions 41 b and 42 b that are the other inner ends. The rotor 3 is disposed on the outer peripheral side. The same applies to the permanent magnets 43 and 44.

  The polarities of the unit magnetic pole units 32 are alternately reversed in the circumferential direction of the rotor 3. That is, in the unit magnetic pole unit 32 at the left end of FIG. 4, the permanent magnets 41 and 42 are arranged so that the inner side of the rotor 3 is an N pole, and in the central unit magnetic pole unit 32, the permanent magnets 43 and 44 are The inner side of the rotor 3 is arranged to be the S pole. In the right unit magnetic pole unit 32, the permanent magnets 41 and 42 are arranged such that the inner side of the rotor 3 is an N pole.

  The rotor yoke 31 is provided with positioning protrusions 31T for positioning the unit magnetic pole unit 32 in the circumferential direction so as to extend in the axial direction at equal intervals in the circumferential direction. The unit magnetic pole unit 32 is fixed to the rotor yoke 31 with an adhesive.

  In this way, the unit magnetic pole unit 32 of the rotor 3 constitutes each magnetic pole by embedding the permanent magnets 41 and 42 or the permanent magnets 43 and 44 in the magnetic pole yoke 32a, and between the unit magnetic pole units 32 (magnetic poles), Since they are separated via air, the leakage magnetic flux between the unit magnetic pole units 32 can be reduced, and the efficiency of the rotating electrical machine 100 can be improved.

  Further, since the permanent magnets 41 to 44 can be magnetized by the unit magnetic pole unit 32, the permanent magnets 41 to 44 can be more reliably magnetized than when the stator 2 is magnetized as a magnetized yoke. And the non-magnetized region can be eliminated. As a result, the efficiency of the rotating electrical machine 100 can be improved and the demagnetization of the permanent magnets 41 to 44 due to the demagnetizing field of the stator 2 can be suppressed (if the permanent magnet has a non-magnetized area, the demagnetized area demagnetizes the non-magnetized area. ), A highly reliable high-performance rotating electrical machine 100 can be obtained. Furthermore, since the permanent magnets 41 to 44 can be magnetized in units of the unit magnetic pole unit 32, the magnet can be magnetized with a simple magnetizing device using, for example, an air-core coil or the like, and the rotating electrical machine 100 can be manufactured at low cost.

  Further, even if, for example, a casting is used as the material of the rotor yoke 31, it is not necessary to separately process a hole for embedding the permanent magnet, so that the embedded magnet type rotor 3 can be easily configured. Thereby, utilization of reluctance torque becomes easy and the efficiency of the rotating electrical machine 100 can be further improved.

  Further, when the yoke pieces of the magnetic pole yoke 32a are press-molded and laminated to form the magnetic pole yoke 32a, each yoke piece can be punched in a small size, so that it is compared with the case of punching in an annular shape or an arc shape. Material yield can be improved.

  Furthermore, by replacing the permanent magnet of the conventional surface magnet type rotor structure in which the permanent magnet is directly attached to the rotor yoke with the unit magnetic pole unit 32 according to the present invention, it can be easily changed to the embedded magnet type rotor structure. Thereby, the variation of a rotor structure can be changed easily and the production of a rotor with a different magnet arrangement structure is facilitated.

Embodiment 2. FIG.
Hereinafter, the rotating electrical machine according to the second embodiment of the present invention will be described with reference to the drawings, focusing on the differences from the first embodiment.
FIG. 6 is an enlarged plan view of a main part of the rotor 203 according to the second embodiment of the present invention, and corresponds to FIG. 4 of the first embodiment.
The difference from the first embodiment is that in the unit magnetic pole unit 232, the permanent magnets 41 to 44 are provided close to the mounting surface 232a2 side of the magnetic pole yoke 232a. Thereby, since the area of the part 232d corresponding to the outer peripheral side of the permanent magnets 41 to 44 of the magnetic pole yoke part can be increased, the horizontal axis (q axis) magnetic flux φq passing through the part 232d becomes easy to pass and the horizontal axis (q Axis) Inductance Lq increases. Accordingly, the difference Lq−Ld between the horizontal axis (q axis) inductance Lq and the direct axis (d axis) inductance Ld increases, and therefore, the reluctance torque proportional to Lq−Ld increases. For this reason, the saliency is improved, the reluctance torque is easily utilized, and the driving force of the motor can be improved.

Embodiment 3 FIG.
Hereinafter, the rotating electrical machine according to the third embodiment of the present invention will be described with reference to the drawings, focusing on the differences from the first embodiment.
FIG. 7 is an enlarged plan view of a main part of the rotor 303 according to the third embodiment of the present invention.
As shown in FIG. 7, chamfers 341 b to 344 b perpendicular to the radial direction are provided on the side of the magnetic pole yoke 332 a mounting surface 332 a 2 of the permanent magnets 341 to 344 to form a pentagonal section in the axial direction. When the shapes of 332h1 and 332h2 are also matched, the permanent magnets 341 to 344 can be moved closer to the mounting surface 332a2, and the area of the portion 332d corresponding to the outer peripheral side than the permanent magnets 341 to 344 of the magnetic pole yoke portion is increased. Therefore, the horizontal axis (q axis) magnetic flux φq passing through the portion 332d can be easily passed, and the horizontal axis (q axis) inductance Lq is increased. Accordingly, the difference Lq−Ld between the horizontal axis (q axis) inductance Lq and the direct axis (d axis) inductance Ld increases, and therefore, the reluctance torque proportional to Lq−Ld increases. For this reason, it becomes easy to utilize reluctance torque.

Embodiment 4 FIG.
Hereinafter, the rotating electrical machine according to the fourth embodiment of the present invention will be described with reference to the drawings, focusing on the differences from the first embodiment.
FIG. 8 is an enlarged plan view of a main part of a rotor 403 according to the fourth embodiment of the present invention, and corresponds to FIG. 4 of the first embodiment. The difference from the first embodiment is that each permanent magnet 41 to 44 is symmetric with respect to the radial axis AA passing through the axis of the support shaft 71 that is the rotation center of the rotor 403 and the center of the unit magnetic pole unit 432. And when it sees from the rotation center side of the rotor 403, it is the point by which two cross sections perpendicular | vertical to the axial direction of the rotor 403 are arrange | positioned, for example so that a C shape may be exhibited. That is, as shown in FIG. 8, the end portions 41 a and 42 a that are one end of the unit magnetic pole unit 432 in the circumferential direction of the two permanent magnets 41 and 42 are the end portions 41 b and 42 b that are the other inner ends. Therefore, it is arranged so as to be located on the inner peripheral side of the rotor 403.

  By arranging the permanent magnets 41 and 42 in this way, the magnetic flux distribution of the unit magnetic pole unit 432 can be made to follow the arcuate outer peripheral surface 32a1, so that the magnetic flux density distribution becomes a substantially rectangular wave shape, and the driving torque of the rotating electrical machine can be improved.

Embodiment 5 FIG.
Hereinafter, the rotating electrical machine according to the fifth embodiment of the present invention will be described with reference to the drawings, focusing on the differences from the first embodiment.
FIG. 9 is an enlarged plan view of a main part of a rotor 503X according to the fifth embodiment of the present invention, and corresponds to FIG. 4 of the first embodiment.
FIG. 10 is an enlarged plan view of a main part of a rotor 503Y according to the fifth embodiment of the present invention, and corresponds to FIG. 8 of the fourth embodiment.

  In each figure, recesses 532Xa3 and 532Ya3 are provided in the axial direction at the center of the mounting surfaces 532Xa2 and 532Ya2 of the magnetic pole yokes 532Xa and 532Ya. These concave portions 532Xa3 and 532Ya3 are regions for applying an adhesive when the unit magnetic pole units 532X and 532Y are bonded and fixed to the rotor yoke 31. As described above, by providing the recesses 532Xa3 and 532Ya3, the thickness of the adhesive layer can be secured by a predetermined thickness, so that the unit magnetic pole units 532X and 532Y can be firmly bonded to the rotor yoke 31.

  The thickness Dy of the recesses 532Xa3 and 532Ya3 depends on the adhesive to be used. However, when the thickness is set to about 0.03 to 0.15 mm, the adhesive strength is stabilized and the decrease in magnetic flux density due to the recesses 532Xa3 and 532Ya3 can be ignored. It will be about. Further, by providing the recesses 532Xa3 and 532Ya3, it is difficult for the direct axis (d axis) magnetic flux passing through the permanent magnets 41 to 44 to pass, and the direct axis (d axis) inductance Ld is reduced. Accordingly, the difference Lq−Ld between the horizontal axis (q axis) inductance Lq and the direct axis (d axis) inductance Ld increases, and therefore, the reluctance torque proportional to Lq−Ld increases. For this reason, since the saliency is improved and the reluctance torque is easily utilized, the driving force of the rotating electrical machine can be improved.

Embodiment 6 FIG.
Hereinafter, the rotating electrical machine according to the sixth embodiment of the present invention will be described with reference to the drawings, focusing on the differences from the first embodiment.
FIG. 11 is an enlarged plan view of a main part of a rotor 603 according to the sixth embodiment of the present invention, and corresponds to FIG. 8 of the fourth embodiment.
On the mounting surface 632a2 side of the magnetic pole yoke 632a constituting the unit magnetic pole unit 632, the magnetic member between the permanent magnets 41 and 42 is connected to the concave portion 632a3 and separated to the vicinity of the surface of the permanent magnets 41 and 42 on the stator 2 side. A crossing groove 632a4 is provided. The groove 632a4 only needs to divide the permanent magnets 41 and 42 by more than half.

FIG. 12A is a schematic diagram showing the flow of magnetic flux when the unit magnetic pole unit 632 is magnetized when the groove 632a4 is provided.
FIG. 12B is a schematic diagram showing the flow of magnetic flux when the magnetic pole unit 532Y is magnetized when the groove 32a4 is not provided (see FIG. 10).
When the permanent magnet is magnetized by the unit magnetic pole unit 632 using the air-core coil, by providing the groove 632a4 in this way, the flow of magnetic flux φ at the time of magnetization is made permanent by the change in permeance in the magnetic pole yoke 632a. The permanent magnets 41, 42 can be aligned in the vicinity of the magnets 41, 42 in the direction in which the permanent magnets 41, 42 are desired to be magnetized (perpendicular to the upper and lower surfaces in the figure of the permanent magnets 41, 42). it can. In addition, the leakage magnetic flux between the two permanent magnets 41 and 42 provided on the left and right can be reduced, so that the efficiency of the rotating electrical machine can be improved.
For convenience of explanation, in the above description, the expressions “permanent magnets 41 and 42” are used both before and after magnetization.

Embodiment 7 FIG.
Hereinafter, the rotating electrical machine according to the seventh embodiment of the present invention will be described with reference to the drawings, focusing on the differences from the first embodiment.
FIG. 13 is an enlarged plan view of a main part of the rotor 703 according to the seventh embodiment of the present invention. Although the shape of the attachment surface of the unit magnetic pole unit to the rotor yoke has been described as flat in the above description, it may be a curved attachment surface 732a2 as shown in FIG. In this case, if the positioning protrusion for positioning the unit magnetic pole unit 732 is omitted, the rotor yoke 731 can be easily processed.

Embodiment 8 FIG.
Hereinafter, the rotating electrical machine according to the eighth embodiment of the present invention will be described with reference to the drawings, focusing on the differences from the first embodiment.
FIG. 14 is an enlarged plan view of a main part of a rotor 803 according to the eighth embodiment of the present invention, and corresponds to FIG. 4 of the first embodiment.

A groove portion 832a4 is provided on the mounting surface 832a2 side of the magnetic pole yoke 832a constituting the unit magnetic pole unit 832 so as to be connected to the concave portion 832a3 so that the top portion is located between the permanent magnets 41 and 42.
The depth of the groove is different from the groove 632a4 of the sixth embodiment. The groove part 832a4 should just partition between the permanent magnets 41 and 42 less than half.

FIG. 15A is a schematic diagram showing the flow of magnetic flux when the unit magnetic pole unit 832 is magnetized when the groove 832a4 is provided.
FIG. 15B is a schematic diagram showing the flow of magnetic flux when the magnetic pole unit 532X is magnetized when the groove 832a4 is not provided (see FIG. 9).
When the permanent magnets 41 and 42 are magnetized in units of the unit magnetic pole unit 832 using an air-core coil, by providing the groove 832a4 in this way, the flow of magnetic flux during magnetization due to a permeance change in the magnetic pole yoke 832a. φ can be adjusted in the direction in which the permanent magnets 41 and 42 are desired to be magnetized in the vicinity of the permanent magnets 41 and 42 (perpendicular to the upper and lower surfaces in the figure of the permanent magnets 41 and 42), and the permanent magnets 41 and 42 can be efficiently magnetized. It can be carried out. Moreover, since the leakage magnetic flux between the permanent magnets 41 and 42 provided on the left and right can be reduced, the efficiency of the rotating electrical machine can be improved.

Embodiment 9 FIG.
Hereinafter, the rotating electrical machine according to the ninth embodiment of the present invention will be described with reference to the drawings, focusing on the differences from the first embodiment.
FIG. 16 is an enlarged plan view of a main part of a rotor 903X according to the ninth embodiment of the present invention, and corresponds to FIG. 4 of the first embodiment.
FIG. 17 is an enlarged plan view of a main part of a rotor 903Y according to the ninth embodiment of the present invention, and corresponds to FIG. 8 of the fourth embodiment.

  End notches 32e (slits) are provided on both end surfaces in the circumferential direction of the respective rotors of the magnetic pole yokes 932Xa and 932Ya of the unit magnetic pole units 932X and 932Y. By providing the end notch 32e, the leakage magnetic flux of the permanent magnets 41 to 44 on the end notch 32e side can be reduced, so that the efficiency of the rotating electrical machine can be improved. Although not shown, the end cutouts 32e do not have to be in all the axial directions of the rotors 903X and 903Y. For example, the axial ends of the unit magnetic pole units 932X and 932Y are formed of the cross section of FIG. Other portions may have an end cutout as shown in FIG.

Embodiment 10 FIG.
Hereinafter, the rotating electrical machine according to the tenth embodiment of the present invention will be described with reference to the drawings, focusing on the differences from the first embodiment.
FIG. 18A is a side view of a rotor 1003 according to Embodiment 10 of the present invention.
FIG. 18B is an enlarged plan view of a main part of the rotor 1003.
As shown in FIG. 18A, two unit magnetic pole units 1032 arranged in the axial direction are arranged on the outer peripheral surface of the rotor 1003 in a state shifted (skewed) by a predetermined angle in the circumferential direction. One magnetic pole is formed in pairs.

  Thus, by using the two unit magnetic pole units 1032 while being skewed, the step skew structure of the magnetic poles of the rotor 1003 can be easily configured, and the torque ripple of the rotating electrical machine can be reduced. Even if the step skew structure is adopted, magnetization is performed in units of unit magnetic pole units 1032 as in the first embodiment, so that magnetization may be incomplete as in a conventional permanent magnet embedded rotor. In addition, the demagnetizing field does not demagnetize the unmagnetized region and the driving force does not decrease. Further, it is possible to magnetize with a simple magnetizing device such as an air-core coil as in the other embodiments.

Embodiment 11 FIG.
Hereinafter, a rotating electrical machine according to an eleventh embodiment of the present invention will be described with reference to the drawings.
FIG. 19 is a cross-sectional view of an elevator hoisting machine 10 that uses the rotating electrical machine 100 according to each of the embodiments described so far. The elevator hoisting machine 10 is used to drive an elevator car.

  The rotor yoke 1131 is provided with a sheave 1131 a around which a rope that pulls the elevator car is provided, and a brake 50 that brakes the rotation of the rotor 1103 is provided inside the rotor yoke 1131. Note that cast iron is used for the rotor yoke 1131. Thus, even if a casting is used as the rotor yoke 1131, the embedded magnet type rotor 1103 can be easily configured, so that reluctance torque can be utilized and the efficiency of the rotating electrical machine can be improved.

  In the first embodiment and the eleventh embodiment, the stator structure is in the form of concentrated winding in which one drive coil 24 is provided in one magnetic tooth portion, but the distribution of the drive coil 24 straddling a plurality of magnetic tooth portions. A stator structure in the form of a winding may be used.

  It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

100 rotating electric machine, 2 stator, 21 stator iron core, 21a back yoke part,
21b magnetic pole tooth part, 21bs magnetic pole tooth tip part, 23 insulator,
24 drive coil,
3,203,303,403,503X, 503Y, 603,703,803,903X, 903Y, 1003,1103 rotor,
31,731,1131 rotor yoke, 31T protrusion,
32,232,432,532X, 532Y, 632,732,832,932X, 1032 unit magnetic pole unit,
32a, 232a, 332a, 532Xa, 632a, 832a, 932Xa magnetic pole yoke,
32a1 arcuate outer peripheral surface,
32a2, 232a2, 332a2, 532Xa2, 632a2, 732a2, 832a2 mounting surface,
32a3, 532Xa3, 832a3 recess,
32a4, 632a4, 832a4 groove, 32e end notch,
32h1, 32h2, 332h1, 332h2 magnet housing holes,
41-44, 341-344 permanent magnet, 7 housing, 71 spindle, 9 bearing,
10 Elevator hoisting machine, 50 brakes, 1131a sheave.

Claims (14)

A stator having a stator core having a plurality of magnetic pole teeth protruding from the annular back yoke to the radially inner periphery of the back yoke, and an armature coil provided on the stator core;
A rotor yoke that is rotatably provided so as to be opposed to the inner peripheral side tips of the plurality of magnetic teeth portions, and extends in the axial direction of the rotor yoke. In a rotating electrical machine composed of a rotor having a plurality of permanent magnets arranged in the circumferential direction of the rotor yoke to form,
The unit magnetic pole unit constituting the magnetic pole of the rotor is composed of the permanent magnet and a magnetic pole yoke made of a magnetic material separate from the rotor yoke, which has a magnet housing hole for housing and holding the permanent magnet. ,
The rotating electric machine is configured such that the unit magnetic pole units are held on the outer peripheral surface of the rotor yoke, spaced apart from each other at a predetermined interval in the circumferential direction of the rotor yoke. The rotating electrical machine according to claim 1, wherein the unit magnetic pole unit has a plurality of the magnet housing holes. The plurality of permanent magnets are symmetrical with respect to a radial axis passing through the rotation center of the rotor and the center of the unit magnetic pole unit, and
3. The rotating electrical machine according to claim 2, wherein one end of each of the permanent magnets on the end side in the circumferential direction of the unit magnetic pole unit is disposed so as to be positioned on the outer peripheral side of the rotor from the other end. The plurality of permanent magnets are symmetrical with respect to a radial axis passing through the rotation center of the rotor and the center of the unit magnetic pole unit, and
The rotating electrical machine according to claim 2, wherein one end of each of the permanent magnets on the end side in the circumferential direction of the unit magnetic pole unit is located on the inner peripheral side of the rotor from the other end. 4. The rotating electrical machine according to claim 3, wherein the magnet housing hole is disposed close to the rotor yoke inside the magnetic pole yoke. The permanent magnet has a pentagonal cross section perpendicular to the axial direction of the rotor, and among the five surfaces of the permanent magnet parallel to the rotational axis of the rotor, the surface closest to the rotational axis is the surface of the rotor. The rotating electrical machine according to claim 5, wherein the rotating electrical machine is formed perpendicular to the radial direction. 4. A groove portion that opens in a mounting surface of the unit magnetic pole unit and extends in the axial direction of the rotor between the magnet housing holes is provided between the plurality of magnet housing holes of one unit magnetic pole unit. Or the rotary electric machine of Claim 4. Between the plurality of magnet housing holes of one unit magnetic pole unit, an opening is made in the mounting surface of the unit magnetic pole unit, and extends between the magnet housing holes in the axial direction of the rotor, and the plurality of permanent magnets The rotating electrical machine according to claim 3, further comprising a groove portion that divides the space between the rotor and the rotor in a radial direction of less than half. Between the plurality of magnet housing holes of one unit magnetic pole unit, an opening is made in the mounting surface of the unit magnetic pole unit, and extends between the magnet housing holes in the axial direction of the rotor, and the plurality of permanent magnets The rotating electrical machine according to claim 4, further comprising a groove portion that divides the space between the two in the radial direction of the rotor. The rotating electrical machine according to any one of claims 1 to 9, wherein a concave portion extending in an axial direction of the rotor yoke is provided on an attachment surface of the unit magnetic pole unit to the rotor yoke. 11. The slit according to claim 2, wherein a slit that extends in an axial direction of the rotor yoke and communicates with the magnet housing hole is provided on an end surface of the magnetic pole yoke in the circumferential direction of the rotor yoke. The rotating electrical machine according to claim 1. The rotating electric machine according to any one of claims 1 to 11, wherein the unit magnetic pole unit is divided into a plurality of parts in the axial direction of the rotor and is skewed in the circumferential direction. 13. The positioning projection portion provided on the outer peripheral surface of the rotor yoke, wherein the unit magnetic pole unit is positioned on the rotor yoke, and is provided so as to extend in the axial direction at equal intervals in the circumferential direction. The rotating electrical machine according to any one of claims. An elevator hoisting machine provided with the rotating electrical machine according to any one of claims 1 to 13, which drives a cage of the elevator.

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