JP2010158130A - Permanent magnet type rotating electric machine and elevator device using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a step skew at which the arrangement of permanent magnets is shifted in the circumferential direction while suppressing cost. <P>SOLUTION: This permanent magnet type rotating electric machine (1) includes: a stator core (4) in which a plurality of stator salient poles (42) are radially protruded; a stator (2) having a stator winding (5) accommodated into a slot (44) which is formed between the adjacent stator salient poles; a stator core (7); and a rotor having a plurality of the permanent magnets (6) which are arranged at equal intervals in the circumferential direction of the stator core. In the stator core, a plurality of grooves (31) which are longer than the permanent magnets in width are formed in the circumferential direction, the permanent magnet is formed into a flat shape at a rotor core side, and the groove is formed into a flat shape at a side face and a bottom face. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a permanent magnet type rotating electrical machine having a skewed rotor and an elevator apparatus using the same.

In the permanent magnet type rotating electric machine, torque pulsation due to cogging torque becomes a problem. In particular, the permanent magnet type rotating electrical machine applied to an elevator hoisting machine requires low torque pulsation (1% or less at pp) in a wide range from the rated torque to the maximum torque. Serious. In addition, the rectangular permanent magnets tend to have a rectangular magnetic flux distribution having a harmonic component because the magnetic flux distribution does not approximate a sine wave. As countermeasures against torque pulsation, generally used is a kamaboko-shaped permanent magnet or skews a stator or a rotor. By performing the skew, torque pulsation due to cogging torque can be reduced.
The permanent magnet type rotating electrical machine can perform step skew in order to prevent torque pulsation and electromagnetic noise. For example, Patent Documents 1 and 2 disclose a method of step skewing a permanent magnet. In the permanent magnet type rotating electrical machines disclosed in Patent Documents 1 and 2, in order to reduce the harmonics of the magnetic flux distribution, a plurality of permanent magnets are mutually connected to the axial direction and the circumference of the rotor on the magnet attaching surface of each rotor core. It is configured to be shifted in the direction.
In particular, Patent Document 2 describes that since cogging torque is generated in a sine wave shape, if the waveforms are shifted by ½ period and added together, the two cogging torques cancel each other and the combined cogging torque can be reduced. ing.
JP 2006-304407 A JP 2008-48481 A (paragraph 0023)

Here, milling is used as a manufacturing method of the magnet sticking surface of the rotor core. That is, in the rotor core, the magnet attaching surface is cut along the magnet arrangement skewed stepwise in the axial direction and the circumferential direction of the rotor, and the width of the circumferential groove of the rotor on the magnet attaching surface is determined by the permanent magnet. It is formed in a size that fits.
The problem caused by this step skew is an increase in cost due to the processing of the magnet attachment surface of the rotor core. As an example, the permanent magnet rotating electric machine of Patent Document 1 is cut in a groove shape that is step-skewed in the axial direction and the circumferential direction of the rotor in the milling of the magnet attachment surface of the rotor core. That is, when a rectangular permanent magnet is used, a plurality of rectangular bottom surfaces must be formed in the groove in the circumferential direction and the axial direction. Further, in order to generate cogging torque in a sine wave shape, it is said that the cogging torque can be reduced by making the bottom surface of each groove parallel to a tangential plane perpendicular to the radial direction.
For this reason, when a plurality of permanent magnets are arranged shifted in the circumferential direction and the radial direction, this groove usually has a plurality of bottom surfaces that intersect at an angle determined by the number of magnetic poles.
That is, in order to form one groove, it is necessary to mill each bottom surface, which takes time for cutting and leads to an increase in cost.

  Accordingly, the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a permanent magnet type rotating electrical machine capable of shifting the arrangement of permanent magnets in the circumferential direction while suppressing cost.

  In order to achieve the above object, a permanent magnet type rotating electrical machine according to the present invention includes a stator core (4) having a plurality of stator salient poles (42) projecting in a radial direction and the stator salient poles adjacent to each other. The stator (2) having a stator winding (5) housed in a slot (44) formed on the rotor core (7), the rotor core (7), and the rotor core are arranged at equal intervals in the circumferential direction. A rotor provided with a plurality of permanent magnets (6), wherein the rotor iron core is formed with a plurality of grooves (31) having a longer width than the permanent magnets in the circumferential direction, In the permanent magnet, the rotor core side surface is formed in a flat shape, and a plurality of the magnets are displaced in the circumferential direction and arranged in each of the grooves, and the groove has a side surface and a bottom surface formed in a flat shape. Features. Further, the plurality of permanent magnets disposed in the groove are displaced from each other in the circumferential direction. The numbers in parentheses are examples.

According to this, the several permanent magnet arrange | positioned at the groove | channel of a rotor core is shifted | deviated and arrange | positioned in the axial direction and the circumferential direction. Thereby, step skew is realized and torque pulsation due to cogging torque is reduced.
Further, since the surface of the permanent magnet on the rotor core side is formed in a flat shape, and the side surface and bottom surface of the groove are flat, it can be cut straight along the axial direction of the rotor. It can be suppressed.

  According to the present invention, it is possible to shift the arrangement of the permanent magnets in the circumferential direction while suppressing costs. Thereby, step skew is realized and torque pulsation due to cogging torque is reduced.

(First embodiment)
A permanent magnet type rotating electrical machine according to an embodiment of the present invention will be described with reference to the cross-sectional view of FIG.
In FIG. 1, a permanent magnet type rotating electrical machine 1 includes a columnar stator 2 and a cylindrical rotor 3 that is disposed opposite to the outer peripheral side of the stator 2 via a gap 33. This is an abduction type rotating electrical machine. The permanent magnet type rotating electrical machine 1 is configured such that the stator 2 generates a rotating magnetic field, and the rotor 3 rotates due to the magnetic interaction between the rotor 3 and the stator 2.
Although the present embodiment shows an outer rotation type permanent magnet type rotating electrical machine 1, the present invention can also be implemented in an inner rotation type permanent magnet type rotating electrical machine. In addition, the inner rotation type permanent magnet type rotating electrical machine (see FIGS. 11B and 11D) includes a stator and a rotor as in the outer rotation type, but the stator and the rotor are opposed to each other. Are reversed, and the rotor is arranged to face the stator so that the rotor can rotate on the inner peripheral side of the stator via the gap 33.

  The stator 2 uses a stator core 4 having a plurality of stator salient poles (teeth) 42 provided in the radial direction and a stator slot 44 formed between adjacent stator protrusions 43. And a wound stator winding 5. The stator salient poles 42 are arranged at equal intervals in the circumferential direction along the outer peripheral surface of the yoke portion 41.

  The stator core 4 protrudes radially outward from a cylindrical yoke portion 41 (referred to as a “core back portion”) and an outer peripheral surface of the yoke portion 41, and extends in the axial direction along the outer peripheral surface of the yoke portion 41. A plurality of existing stator salient poles 42 (referred to as “teeth portions”) and stator protrusions 43 formed on both sides in the circumferential direction of the tip of the stator salient pole 42, and adjacent stator salient poles 42. A stator slot 44 is formed therebetween.

The stator salient poles 42 do not include the stator protrusions 43 formed on both sides in the circumferential direction, and the stator slot 44 can be a fully open slot. The number of stator salient poles 42 is 12, which is a multiple of the number of phases 3.
The stator core 4 is formed by laminating a plurality of plate-shaped molding members formed by punching a plate-shaped magnetic member (electromagnetic steel plate) in the axial direction. This laminated structure reduces eddy current loss and heat generation.

  The stator salient poles 42 are concentratedly wound with corresponding phase windings 34 of the stator windings 5 via insulating members (winding bobbins (not shown)). This concentrated winding is a winding method in which a plurality of winding conductors are wound around the four side surfaces of the stator salient pole 42. Coil end portions of the phase winding 34 protrude outward in the axial direction from both axial ends of the stator core 4. Either a star connection method in which the respective phase windings of the stator winding 5 are connected in a Y shape or a delta connection method in which the stator windings 5 are connected in a Δ shape may be employed. The stator core 4 constitutes a magnetic path on the stator side, and the stator winding 5 generates a magnetic flux in the stator salient pole 42 by energization. The rotor core 7 functions as a magnetic path on the rotation side, and the permanent magnet 6 functions as a rotating magnetic pole.

  The rotor 3 has a cylindrical rotor core 7 in which a plurality of equally spaced grooves 31 are formed in the axial direction along the circumferential direction on the inner peripheral portion, and a semi-cylindrical shape pasted on the grooves 31. A plurality of permanent magnets 6 and a shaft 8 provided on a side plate (FIG. 11) of the rotor core 7 are provided. The permanent magnet 6 has N poles and S poles alternately stuck in the circumferential direction, and the number thereof is ten, which is an even number.

  The rotor core 7 is formed of a casting such as cast iron, and is coupled to the shaft 8 via a side plate of the stator 2 (see FIG. 12). The permanent magnet 6 is arranged so that the magnetic poles of the N pole and the S pole are in the radial direction using a rare earth magnet that contributes to downsizing and high efficiency of the permanent magnet type rotating electrical machine. The permanent magnet 6 is formed in a kamaboko shape, and is affixed to the groove 31 of the rotor core 7 on the inner peripheral surface of the rotor core 7 using an adhesive. In the permanent magnet 6, a semi-cylindrical arc portion slightly protrudes radially inward from the inner peripheral surface of the rotor core 7.

The rotor 3 according to this embodiment will be described in detail with reference to FIGS.
FIG. 2 is a partial perspective view showing the configuration of the rotor 3 of the permanent magnet type rotating electrical machine 1. 3 and 4 are partial development views of the rotor 3 as viewed radially outward from the stator 2 side. FIG. 5 is a partial view of the rotor 3 as seen from the stator 2 side, showing a method of cutting by milling in order to recess the groove 31 for attaching the permanent magnet 6. FIG. 6 is a perspective view of the rotor core 7 when the permanent magnet 6 is removed from the rotor core 7. FIG. 7 is a partial development view of the rotor core 7 when the permanent magnet 6 is removed from the rotor core 7 as viewed radially outward from the stator 2 side.

The rotor 3 is affixed in the axial direction so that the plurality of permanent magnets 6 have the same polarity in each of the grooves 31 of the rotor core 7 (FIGS. 2 and 3). Further, the plurality of permanent magnets 6 are formed shorter than the width of the groove 31 and are shifted in the circumferential direction. That is, the plurality of permanent magnets 6 have one side surface and a bottom surface in contact with the groove 31, and the other side surface is separated from the side surface of the groove 31 to form a separation portion 32. That is, the groove 31 is formed longer than the width of the permanent magnet 6. In addition, the separation part 32 between the other side surface of the permanent magnet 6 and the side surface of the groove 31 can be loaded with a nonmagnetic material.
In FIG. 4, if the permanent magnet 6 has a width of Xpm, the pitch width is Xpp, and the groove 31 has a width of X, the relationship between Xpm, Xpp, and X is
Xpm <X <Xpp (1) Equation (1)
At this time, the angle by which the permanent magnet 6 is shifted is preferably ½ of the angle of one period of the cogging torque.
2 and 3, both the permanent magnets 6a and 6b are inclined from the tangential plane perpendicular to the radial direction, but one of the permanent magnets 6a and 6b is parallel to the tangential plane and the other is inclined. You may let them.

Moreover, as shown in FIG. 5, the groove | channel 31 which attaches the permanent magnet 6 can be cut straightly along the axial direction of the rotor core 7 by milling. That is, unlike the prior art, it is not necessary to form a groove having a plurality of rectangular bottom surfaces in the circumferential direction and the axial direction.
In addition, even if it is an outer rotation type | mold, since the processing method becomes difficult when the rotor 3 is bowl-shaped, the side part of the rotor 3 and the radial direction outer peripheral part of the rotor 3 are separated. Etc. are necessary.

  6 and 7, the side surface and bottom surface of the groove 31 of the rotor core 7 are formed in a flat shape, and both side surfaces of the groove 31 are formed in parallel. Thereby, attachment of the rectangular parallelepiped base part of the permanent magnet 6 becomes easy. Further, as shown in the second embodiment (see FIGS. 9 and 10), the rotor 3 can use a rectangular parallelepiped (rectangular) permanent magnet 16, which leads to cost reduction.

8A, in the groove 31 of the rotor core 7, a permanent magnet 6a and a permanent magnet 6b arranged so as to be shifted in the axial direction and the circumferential direction of the rotor 3 with respect to the permanent magnet 6a are arranged. Has been. The circumferential displacement width Xs between the permanent magnet 6a and the permanent magnet 6b is as follows. The width of the permanent magnets 6a and 6b is Xpm and the width of the groove 31 is X.
0 <Xs ≦ X−Xpm (2). However, the present invention is not applicable when the value of (X−Xpm) is smaller than the skew angle.

  In the present embodiment, the permanent magnet 6 is divided into two parts in the axial direction, but the present invention is not limited to this, and three or more parts are possible. As shown in FIG. 8B, in the case of three divisions, the permanent magnets 6a and 6c arranged in the front and rear stages have either end face abutting against the side surface of the groove 31, but in the middle part. An end surface of the arranged permanent magnet 6 b does not contact the side surface of the groove 31.

  Since these are cut straight along the axial direction of the rotor 3 in the processing of the magnet attachment surface of the rotor core 7, a step skew can be performed by simple processing, improving productivity and reducing costs. Become. According to the present embodiment, in processing the magnet attachment surface of the rotor core, cutting is performed straight along the axial direction of the rotor, so that step skew can be performed by simple processing and cogging torque is reduced. In addition, since the side surface and bottom surface of the groove are flat, a permanent magnet having a rectangular mounting portion can be used, and a permanent magnet type rotating electrical machine that can improve productivity and reduce costs can be provided.

  In the permanent magnet type rotating electrical machine 1, when an attempt is made to rotate the rotor 3 at a low speed by applying a rotational torque from the outside in a non-energized state, uneven rotation occurs in the torque necessary for the rotation. The cogging torque refers to this rotation unevenness, and is generated when the sexual magnetic attraction force acting between the rotor and the stator varies depending on the rotation position.

(Second Embodiment)
FIG. 9 is a perspective view showing the configuration of the rotor 3a of the permanent magnet type rotating electrical machine 1a according to the second embodiment of the present invention, and FIG. 10 is a cross-sectional view showing the configuration of the permanent magnet type rotating electrical machine 1a. .
The permanent magnet type rotating electrical machine 1 according to the second embodiment is characterized in that the permanent magnet 6 has a rectangular parallelepiped shape instead of a kamaboko shape. In addition, the permanent magnet type rotating electrical machine 1 of the first embodiment is based on the outer rotation type, and the inner rotation type is also applicable. However, the permanent magnet type rotating electrical machine 1a of the second embodiment is an outer rotation type. It is limited to.

Since this is an abduction type, the magnetic flux density in the gap 33 between the stator 2 and the rotor 3a approaches the sine wave, so that it has an effect of reducing torque pulsation (see Japanese Patent Application No. 2008-161801). ).
In addition, a rectangular parallelepiped permanent magnet has a small number of processing, leading to cost reduction. On the contrary, when a rectangular parallelepiped permanent magnet is applied to the inner rotation type, the torque pulsation rises conversely, so that this embodiment is limited to the outer rotation type.

  Further, as shown in FIG. 10, the stator salient pole 42 is a fully open slot without a circumferential projection 43 at the tip. This is because the stator protrusion 43 in the circumferential direction at the tip of the stator salient pole 42 of the stator core 4 shown in FIG. 1 causes magnetic saturation in the maximum torque region, which causes an increase in torque pulsation. By making the slot fully open without the protrusion 43, there is an effect of preventing an increase in torque pulsation in the maximum torque region. The combination of the number of permanent magnets 6 and the number of stator slots 44 of the stator 2 is based on the number of permanent magnets 6 and the number of slots 12 as basic units.

(Comparative Example 1)
FIG. 11 shows a case in which the rectangular parallelepiped permanent magnets 16 a and 16 b are pasted on the grooves of the outer rotation type rotor core 7, and a case in which the rectangular parallelepiped permanent magnets 16 c and 16 d are pasted on the inner rotation type rotor core 15. It is explanatory drawing for comparing with the case where it did.
In the case of the abduction type shown in FIG. 11 (a), the permanent magnets 16 a and 16 b having the same polarity are shifted in the circumferential direction along the inner periphery of the rotor core 7, and are affixed to the rotor core 7. Therefore, the directions Pa and Pb of the magnetic poles of the permanent magnets 16a and 16b and the direction Pe of the composite magnetic pole face the central axis direction and face the stator magnetic pole. For this reason, the directions Pa and Pb of the magnetic poles of the permanent magnets 16a and 16b are inward of each other. The width of the gap between the rotor core 7 and the stator magnetic pole is small below the center of the magnet and large below the end. Considering a magnetic circuit, the magnetoresistance is small below the center of the magnet, and the magnetoresistance is large below the edge. Therefore, the trapezoidal magnetic flux distribution in the gap approaches the sine wave distribution.

On the other hand, in the case of the add-on type shown in FIG. 11 (b), the permanent magnets 16c and 16d having the same polarity are shifted in the circumferential direction and pasted along the outer periphery of the rotor core 15. The magnetic pole directions Pc and Pd of 16c and 16d and the direction Pf of the composite magnetic pole face radially outward and face the stator magnetic pole. For this reason, the directions Pc and Pd of the magnetic poles of the permanent magnets 16c and 16d are outward. A stator core 14 is concentrically arranged on the outer periphery of the rotor core 15. The width of the gap between the rotor core 7 and the stator magnetic pole is large below the center of the magnet and small below the end. Considering the magnetic circuit, the magnetoresistance is large below the center of the magnet, and the magnetoresistance is small below the edge. Therefore, the trapezoidal magnetic flux distribution in the air gap approaches the trapezoidal distribution with the center bottom recessed.
Therefore, the magnetic flux distribution is closer to a sine wave in the outer rotation type in which the direction of the magnetic pole is inward than in the inner rotation type. In addition, the size of the composite magnetic pole Pe is larger than the size of the composite magnetic pole Pf of the inversion type in the outer rotation type in which the magnetic pole direction is inward.

Next, consider a case where the bottom surface of the groove 31 where the permanent magnets 16a and 16b are pasted is planar as in the second embodiment.
In the case of the abduction type shown in FIG. 11C, the directions of the magnetic poles of the permanent magnets 16a and 16b are both Pe, and the magnetic flux distribution does not approach a sine wave shape, but the depth of the center in the circumferential direction of the groove 31 is set. When the inner peripheral surface of the rotor core 7 and the circumferential center surface of the permanent magnets 16a and 16b coincide with the thickness of the permanent magnets 6a and 6b, the circumferential ends of the permanent magnets 16a and 16b A step d1 occurs between the surface and the inner peripheral surface of the rotor core 7.

On the other hand, in the case of the adduction type shown in FIG. 11D, if the surfaces of the end portions of the permanent magnets 16c and 16d coincide with the outer peripheral surface of the rotor core 15, the permanent magnets 16c and 16d A step d2 occurs between the surface in the circumferential center and the outer peripheral surface.
Therefore, in the case of the outer rotation type, the circumferential center surface of the permanent magnet that is offset in the circumferential direction coincides with the inner peripheral surface of the rotor core 7, but in the case of the inner rotation type, the permanent magnet The surface of the end coincides with the outer peripheral surface, and a step d2 is formed at the circumferential center of the permanent magnet.

For this reason, the outer rotation type is preferable to the inner rotation type because the magnetic pole center exists on the inner peripheral surface of the rotor core.
Further, as shown in FIGS. 11A and 11B, when the bottom surface of the groove is ground in accordance with the bottom surfaces of the permanent magnets 16a, 16b, 16c, and 16d, one groove is formed in the circumferential direction and the axial direction. Although it is necessary to form a plurality of rectangular bottom surfaces, in the case of each of the embodiments as shown in FIGS. 11C and 11D, one bottom surface is provided along the axial direction in one groove. What is necessary is just to form straightly.

(Comparative Example 2)
Next, the torque pulsation of the two-pole three-slot motor will be described with reference to FIG. 12, and the fact that this torque pulsation is canceled by the step skew will be described.
FIG. 12A is a conceptual diagram of a 2-pole 3-slot motor, in which permanent magnets of N-pole and S-pole are arranged in the circumferential direction of the rotor, and are fixed in a T shape so as to face each other in the radial direction. Three child salient poles are formed.
In general, it is known that the number of cycles of the cogging torque is the least common multiple of the number of salient poles and the number of magnetic poles. The least common multiple of the number of salient poles 3 and the number of magnetic poles 2 is 6. As shown in FIG. 12B, when the rotor rotates by an electrical angle of 360 degrees, a large cogging torque fluctuation occurs six times. That is, one variation is 360 degrees / 6 = 60 degrees in terms of electrical angle.

FIG. 13A is a diagram showing a state in which permanent magnets are arranged shifted in the circumferential direction as in the first and second embodiments, and FIG. 13B is a diagram showing a state of torque pulsation. is there.
In FIG. 13A, the permanent magnets 6a and 6b are arranged in two stages in the axial direction, and the skew angle shifted by ½ period in the circumferential direction is 30 degrees in electrical angle. In FIG. 13B, the torque pulsation (solid line) of the permanent magnet 6a and the torque pulsation (broken line) of the permanent magnet 6b are sinusoidal, and the phases are reversed. Therefore, the torque pulsation is canceled by shifting the permanent magnets 6a and 6b by 1/2 cycle in the circumferential direction.

  In other words, the grooves for attaching the permanent magnets can generate cogging torque in a sinusoidal shape when the bottom surface of each groove is formed in parallel to the tangential plane perpendicular to the radial direction. it can. That is, it is preferable that the groove for attaching the permanent magnet is formed so that each bottom surface is parallel to the tangential plane perpendicular to the radial direction, while in the embodiment of the present invention, either one of the permanent magnets 6a and 6b or By inclining both from the tangent plane, the groove 31 can be cut straight along the axial direction of the rotor core 7.

(Third embodiment)
A configuration of the hoisting machine when the permanent magnet type rotating electrical machines 1 and 1a of the respective embodiments are applied to an elevator apparatus will be described with reference to FIG.
In FIG. 14, the hoisting machine 9 includes a permanent magnet type rotating electrical machine 1, a sheave 10 that transmits power generated by the permanent magnet type rotating electrical machine 1 to a rope, a brake 11 that applies a braking force to the rotor 3, and a shaft 8. The permanent magnet type rotating electrical machine 1 and the sheave 10 are integrally formed. As described above, the permanent magnet type rotating electrical machine 1 includes the stator 2, the rotor 3, and the shaft 8. Further, since the brake 11 can brake the rotor 3 having a large diameter, the brake 11 can apply a braking force stronger than that of the inner rotation type that brakes the shaft 8.

  By applying the permanent magnet type rotating electrical machine 1 of the present embodiment to a hoisting machine of an elevator device, low torque pulsation (about 1% at pp) in a wide range from the rated torque to the maximum torque becomes possible. Contributes to the reduction of vibrations transmitted to the car and the noise of the elevator mechanism. Furthermore, the processing of the magnet affixing surface of the rotor core 7 for skewing the rotor 3 is simply performed, and the use of a rectangular permanent magnet reduces the number of magnets processed, contributing to cost reduction.

It is a cross-sectional view showing the configuration of the permanent magnet type rotating electrical machine of the first embodiment of the present invention. It is a perspective view which shows the structure of the rotor of the permanent magnet type rotary electric machine of 1st Embodiment of this invention. It is the expanded view which looked at a part of rotor from the stator side. It is the expanded view which looked at some rotors which described various symbols from the stator side. It is the expanded view which looked at a part of rotor from the stator side which shows the method cut by milling in order to provide the groove | channel which attaches a permanent magnet. FIG. 3 is a perspective view of a rotor core when a permanent magnet is removed from the rotor core in FIG. 2. FIG. 3 is a development view of a part of the rotor core as viewed from the stator side when the permanent magnet is removed from the rotor core in FIG. 2. It is the expanded view which looked at a part of rotor which showed various symbols at the time of shifting a magnet in Drawing 3 from the stator side. It is a perspective view which shows the structure of the rotor of the permanent magnet type rotary electric machine of 2nd Embodiment of this invention. It is a cross-sectional view which shows the structure of the permanent-magnet-type rotary electric machine of 2nd Embodiment of this invention. It is explanatory drawing for comparing an outer rotation type | mold and an inner rotation type | mold. It is a figure for demonstrating the torque pulsation of a 2 pole 3 slot motor as a comparative example. It is a figure for demonstrating that torque pulsation is canceled by step skew. It is a longitudinal cross-sectional view which shows the structure of the elevator hoisting machine of 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Permanent magnet type rotary electric machine 2 Stator 3 Rotor 4 Stator core 5 Stator winding 6, 6a, 6b, 6c Permanent magnet 7 Rotor core 8 Shaft 9 Hoisting machine 10 Sheave 11 Brake 12 Housing 13 Bearing 14 Fixed Child core (adduct type)
15 Rotor core (adduct type)
16 Permanent magnet 31 Groove 32 Spacing part 33 Air gap 34 Phase winding 41 Yoke part (core back)
42 Stator salient pole (tooth)
43 Stator projection 44 Stator slot

Claims (10)

A stator comprising a stator core in which a plurality of stator salient poles project in the radial direction, and a stator winding housed in a slot formed between the stator salient poles adjacent to each other;
A rotor comprising a rotor core and a plurality of permanent magnets arranged at equal intervals in the circumferential direction of the rotor core;
In the permanent magnet type rotating electrical machine having
The rotor core has a plurality of grooves in the circumferential direction that are longer than the permanent magnet,
The permanent magnet has a surface on the rotor core side formed in a flat shape, and a plurality of the permanent magnets are disposed in the grooves in a circumferential direction.
The groove has a side surface and a bottom surface formed in a planar shape.   The permanent magnet rotating electric machine according to claim 1, wherein the permanent magnet has a rectangular parallelepiped shape.   The permanent magnet type rotating electric machine according to claim 1, wherein the permanent magnet has a kamaboko shape.   The permanent magnet type rotating electrical machine according to claim 2, wherein one end surface of the permanent magnet is in contact with a side surface of the groove.   The permanent magnet type rotating electrical machine according to any one of claims 1 to 4, wherein the rotor is configured as an abduction type disposed on an outer peripheral portion of the stator.   The permanent magnet type rotating electrical machine according to any one of claims 1 to 5, wherein a tip portion of the stator salient pole is configured as a fully open slot having no circumferential protrusion.   The combination of the number of the permanent magnets and the number of slots of the stator core is based on the number of the permanent magnets of 10 and the number of slots of 12 as basic units. The permanent magnet type rotating electrical machine according to item 1.   The permanent magnet type rotating electrical machine according to any one of claims 1 to 7, wherein the rotor core functions as a magnetic path between the rotor core and the permanent magnet. A stator comprising a stator core having a plurality of stator salient poles projecting in a radial direction, and a stator winding housed in a slot formed between the stator salient poles;
A rotor comprising a plurality of permanent magnets arranged at equal intervals in the circumferential direction of the rotor core;
In the permanent magnet type rotating electrical machine having
The rotor core has a plurality of grooves in the circumferential direction that are longer than the permanent magnet,
The permanent magnet has a rectangular parallelepiped shape,
The rotor is an abduction type disposed on the outer periphery of the stator,
The tip of the stator salient pole is configured as a fully open slot without a circumferential protrusion,
The combination of the number of permanent magnets and the number of slots of the stator core is based on the number of permanent magnets 10 and the number of slots 12 as basic units,
The permanent magnet has a surface on the rotor core side formed in a flat shape, and a plurality of the permanent magnets are disposed in the grooves in a circumferential direction.
The groove has a side surface and a bottom surface formed in a planar shape.   An elevator apparatus using the permanent magnet type rotating electrical machine according to any one of claims 1 to 9.

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