CN203896058U - Permanent magnet type rotating motor and elevator driving hoister - Google Patents

Abstract

The utility model provides a permanent magnet type rotating motor capable of realizing high torque density based on inhibition of increasing of power capacity and an elevator driving hoister. The permanent magnet type rotating motor comprises a stator and a rotor. The stator is constituted by a stator iron core and a stator winding disposed in a groove of the stator iron core. The rotor is opposite to the stator, and a radial air gap is disposed between the rotor and the stator. Rotor iron cores and magnetized permanent magnets, which are alternately in a radiation-shaped arrangement, are disposed in the rotor, and the permanent magnets are at right angles to the radial direction. The smallest width of the opening part of the groove is a, and the width of the front end of the magnetic pole of each of the rotor iron cores is b, and in addition, a is larger than or equal to b.

Description

Permanent magnet rotating motor and elevator drive hoist

technical field

The utility model relates to a permanent magnet rotary motor and an elevator driving hoist using the permanent magnet rotary motor. the

Background technique

A permanent magnet synchronous motor with high torque density and low torque ripple is required for small, light weight, and low-vibration elevator drive hoists. Neodymium magnets with high energy density are used in this motor. However, ferrite magnets, which contain fewer rare earth elements than neodymium magnets, are attracting attention again due to the pursuit of rare earth-less/rare-earth-free permanent magnet rotating electrical machines in recent years. the

The magnetic force of ferrite magnets is about 1/3 of that of neodymium magnets. If you switch from neodymium magnets to ferrite magnets, the volume of the motor increases due to the need to increase the surface area of the magnets to compensate for the lack of torque caused by the drop in magnetic force. This is a big problem when setting up elevator-driven hoists with strict space constraints. Therefore, there is a demand for a permanent-magnet rotating electrical machine capable of realizing a high torque density with a low-magnetic-force magnet such as a ferrite magnet. the

The permanent magnet type rotating motor used in the elevator drive hoist is mainly a surface magnet type (SPM, Surface Permanent Magnet: Surface Permanent Magnet) in which a permanent magnet is attached to the surface of the rotor. However, this structure cannot increase the surface area of the magnet beyond the area of the air gap (the area facing the rotor and the stator), and it is difficult to make the magnetic flux density in the air gap equal to or greater than the residual magnetic flux density of the magnet. Therefore, in such a configuration, it is difficult to achieve a high torque density using a low magnetic force permanent magnet such as a ferrite magnet. the

On the other hand, there is a brushless DC motor disclosed in Patent Document 1 as a permanent-magnet rotating electrical machine realizing high torque density. In the rotor of the electric motor, magnet portions and magnetic material portions are alternately arranged radially. the

Prior art literature

Patent Documents

Patent Document 1: Japanese Patent Laid-Open No. 2000-217286

Utility model content

By arranging the magnets as described in Patent Document 1, since the surface area of the magnets can be enlarged in the radial direction, the magnetic flux density in the air gap between the rotor and the stator can be increased. Therefore, by optimizing the aspect ratio of the rotor core, it becomes possible to make the magnetic flux density in the air gap exceed the residual magnetic flux density of the magnets. Therefore, even when a magnet with a low magnetic force such as a ferrite magnet is used, it is possible to realize a torque density comparable to that of a neodymium magnet. the

However, in the case of an elevator-driven hoist that needs to output a relatively large torque (hundreds to thousands of Nm) when overloaded, the inventors of the present invention have found that in the permanent magnet rotating electrical machine described in Patent Document 1 Large increase in power supply capacity due to leakage magnetic flux. That is, in the permanent magnet type rotating electrical machine described in Patent Document 1, if the magnetic poles of the rotor face the slots of the stator, the magnetic flux generated by the stator winding returns to the stator side through the magnetic pole surface of the rotor and does not contribute to the torque. leakage magnetic flux. Furthermore, this leakage flux causes magnetic saturation of the stator teeth during overload, and the magnetic flux of the permanent magnet does not enter the stator side due to the influence of the magnetic saturation of the teeth, causing torque to saturate with an increase in current. This leads to a large increase in power supply capacity in the case of an elevator driving hoist that needs to output a relatively large torque (hundreds to thousands of Nm) when overloaded. the

As mentioned above, when the permanent magnet rotating electric machine of Patent Document 1 is used as a rotating electric machine for a machine requiring high torque density such as an elevator drive hoist, there is room for improvement in terms of both high torque density and low power supply capacity. . the

An object of the present invention is to provide a permanent magnet rotating electrical machine capable of achieving high torque density while suppressing an increase in power supply capacity, and an elevator drive hoist using the same. the

The means used to solve the problem

The permanent magnet rotating electrical machine of the first aspect of the present utility model is characterized in that it comprises: a stator composed of a stator core and a stator winding arranged in a slot of the stator core; and a rotor separated from the stator by a radial The air gap is opposite, and the rotor cores and the permanent magnets magnetized at right angles to the radial direction are alternately arranged radially, where the minimum width of the opening of the slot is a, and the width of the front end of the magnetic pole of the rotor core is b, satisfying a≥b. the

According to the second aspect of the present invention, in the permanent magnet rotating electrical machine of the first aspect, the shape of the permanent magnet is rectangular, and when the thickness in the magnetization direction is c, b≥c is satisfied. the

In the permanent magnet rotating electrical machine of the third aspect of the present utility model, in the permanent magnet rotating electrical machine of the first aspect, the minimum width of the stator salient pole of the stator core in a direction at right angles to the radial direction is When d, satisfy b≤d. the

According to the fourth aspect of the present utility model, the permanent magnet rotating electrical machine, in the permanent magnet rotating electrical machine of the second aspect, the minimum width of the stator salient pole of the stator core in the direction at right angles to the radial direction is When d, satisfy b≤d. the

According to a fifth aspect of the present invention, in the permanent magnet rotating electrical machine of the fourth aspect, protrusions protruding in the circumferential direction are provided on both sides of the front end of the stator salient pole of the stator core. the

According to a sixth aspect of the present invention, in the permanent magnet rotating electrical machine of the fifth aspect, protrusions protruding in the circumferential direction are provided on both sides of the front ends of the magnetic poles of the rotor core. the

According to a seventh aspect of the present invention, in the permanent magnet rotating electrical machine of the sixth aspect, the front ends of the stator salient poles of the stator core are chamfered. the

According to an eighth aspect of the present invention, in the permanent magnet rotating electrical machine of the seventh aspect, the front ends of the magnetic poles of the rotor core are chamfered. the

According to the ninth aspect of the present utility model, in the permanent magnet rotating electrical machine of the eighth aspect, in the permanent magnet rotating electrical machine of the eighth aspect, the two sides of the front ends of the magnetic poles of the rotor iron core are respectively connected to the rotor irons adjacent to the permanent magnets. The side ends of the magnetic pole tips of the core are connected. the

A tenth aspect of the present invention is a permanent magnet rotating electrical machine, in the ninth aspect of the permanent magnet rotating electrical machine, comprising a ring-shaped non-magnetic body fixed to the rotating shaft of the permanent magnet rotating electrical machine, A dovetail groove is formed on the outer peripheral side of the non-magnetic body, and a dovetail tenon fitted into the dovetail groove from the axial direction is formed on the inner peripheral side of the rotor core. the

In the permanent magnet rotating electric machine of the eleventh aspect of the present invention, in the permanent magnet rotating electric machines of the first to tenth aspects, ferrite magnets are used for the permanent magnets. the

The elevator-driven hoist of the twelfth aspect of the utility model uses the permanent magnet rotating motor of the eleventh aspect of the utility model, and the stator is fixed on the frame of the elevator-driven hoist Above, the rotor is fixed to the rotating body provided with the sheave of the elevator drive hoist. the

utility model effect

Through the utility model, the increase of power supply capacity can be suppressed, and high torque density can be realized. the

Research questions, structures, and effects other than the above can be clarified by the description of the following embodiments. the

Description of drawings

1 is a schematic cross-sectional view in the radial direction of a 1/6 model of a permanent magnet rotating electrical machine according to a first embodiment of the present invention. the

Fig. 2 is a schematic diagram of a radial section of the permanent magnet rotating electrical machine according to the first embodiment of the present invention developed. the

Fig. 3 is an enlarged view of a portion where a rotor and a stator of the permanent magnet rotating electric machine shown in Fig. 1 face each other. the

Fig. 4 is a partially enlarged view of a stator core of the permanent magnet rotating electrical machine shown in Fig. 1 . the

Fig. 5 is a partially enlarged view of a rotor core of the permanent magnet rotating electrical machine shown in Fig. 1 . the

6 is a simulation result of current-torque characteristics of the permanent magnet rotating electrical machine shown in FIG. 1 and the permanent magnet rotating electrical machine of the comparative example. the

7 is an enlarged view of a portion where the rotor and the stator of the permanent magnet rotating electrical machine of the second embodiment of the present invention face each other. the

8 is a schematic cross-sectional view in the radial direction of a 1/6 model of a permanent magnet rotating electrical machine according to a third embodiment of the present invention. the

Fig. 9 is a schematic axial sectional view of an elevator drive hoist using the permanent magnet rotating electrical machine shown in Fig. 8 . the

Detailed ways

Embodiments of the utility model are described below using the accompanying drawings. the

[Example 1]

A permanent magnet type rotating electrical machine according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 6 . the

1 is a schematic cross-sectional view in the radial direction of a 1/6 model (one part divided into six parts in the circumferential direction) of a permanent magnet rotating electrical machine according to a first embodiment of the present invention. the

As shown in FIG. 1 , a permanent magnet rotating electrical machine 1 is composed of a stator 2 and a rotor 3 . The stator 2 includes a stator core 4 and a stator winding 5 . The stator core 4 is formed by laminating a plurality of electromagnetic steel sheets punched out by a punching die. The stator core 4 is composed of an annular stator core back 41 that is arranged on the outer periphery and constitutes a stator magnetic circuit; and stator salient poles (stator teeth) that extend radially from the stator core back 41 to the inner periphery of the stator at predetermined angular intervals. 42 poses. As shown in Figure 1, the space formed between a pair of adjacent stator salient poles 42 and the stator core back 41 is a groove portion 43, which is a space for accommodating the stator winding 5. Here, as shown in FIG. 1 , one stator winding 5 is wound around each stator salient pole 42 . the

On the other hand, the rotor 3 is composed of a shaft 10, a non-magnetic body 9 disposed on the outer peripheral surface of the shaft 10, a rotor core 7 disposed on the outer peripheral surface of the non-magnetic body 9, and a permanent magnet 6, and is separated from the stator 2 by a diameter. The directed air gap 8 is arranged on the inner peripheral side. the

As shown in FIG. 1 , the permanent magnets 6 and the stator cores 7 are respectively arranged radially toward the outer periphery of the rotor. The rotor core 7 is formed by laminating a plurality of electromagnetic steel sheets punched out with a punching die or the like, and as shown in the figure, each pole is separated and arranged at predetermined angular intervals along the circumferential direction of the rotor 3 . The rotor core 7 functions as rotor magnetic poles 71 constituting a rotor magnetic circuit. the

As shown in FIG. 1 , the permanent magnet 6 is housed in the magnet insertion space 72 , which is a space formed by a pair of adjacent rotor magnetic poles 71 and the non-magnetic body 9 . At this time, the magnetization of the permanent magnet 6 is perpendicular to the radial direction of the rotor 3 , and the rotor magnetic poles 71 are alternately arranged in NSNS... along the circumferential direction of the rotor. The permanent magnet 6 uses a ferrite magnet. In addition, the shape of the permanent magnet 6 is desirably rectangular. Since the processing burden of the magnet is reduced, the cost of the magnet can be reduced. the

The permanent magnet 6 is fixed in the magnet insertion space 72 by an adhesive or the like. The non-magnetic body 9 has the effect of reducing the leakage magnetic flux on the inner peripheral side of the rotor pole 71 . The torque acting on the rotor core 7 is transmitted to the shaft 10 through the non-magnetic body 9 . As the nonmagnetic body, nonmagnetic austenitic (austenite) stainless steel such as SUS304 (JIS standard) is used. As the nonmagnetic body, a nonmagnetic aluminum alloy or the like can also be used. the

Furthermore, air gaps can be provided instead of the non-magnetic body 9 . At this time, a pair of discs are oppositely arranged at the axial ends of the rotating shaft 10 , and the rotor core 7 is fixed to the discs by bolts, and the torque acting on the rotor core 7 is transmitted to the rotating shaft 10 through the discs. the

Fig. 2 is a schematic diagram of a radial section of the permanent magnet rotating electrical machine according to the first embodiment of the present invention developed. the

In FIG. 2, let the minimum width of the opening of the groove portion 43 be a, the front end width of the rotor pole 71 be b, the magnetization direction thickness of the permanent magnet 6 be c, and the stator salient pole 42 in the direction perpendicular to the radial direction be When the minimum width is d, a, b, c, and d satisfy a≥b, b≥c, and b≤d in this embodiment. the

Fig. 3 is an enlarged view of a portion where a rotor and a stator of the permanent magnet rotating electric machine shown in Fig. 1 face each other. the

As shown in FIG. 3 , when a≧b is satisfied, there is no portion where the rotor magnetic pole 71 and the stator salient pole 42 overlap in the radial direction in a state where the groove portion 43 faces the rotor magnetic pole 71 . In this way, in the state where the groove portion 43 is opposed to the rotor pole 71, if there is no overlapping portion of the rotor pole 71 and the stator salient pole 42, the stator pole 42-the air gap 8-the surface of the rotor pole 71-the air gap 8 - The reluctance of the magnetic flux path of adjacent stator salient poles 42 increases. Thereby, the leakage component f1 of the magnetic flux of the stator winding 5 becomes small, and the magnetic saturation of the stator salient pole 42 at the time of overload can be alleviated. In addition, saturation of torque with respect to an increase in current can also be alleviated. However, when a is extremely increased or b is extremely decreased, the torque density decreases due to magnetic saturation of the stator salient pole 42 and the rotor magnetic pole 71 , although the effect of reducing the leakage magnetic flux is large. Therefore, by making a and b substantially equal (as equal as possible), both reduction of leakage magnetic flux and high torque density can be achieved. the

In addition, in conventional permanent magnet rotating electrical machines, in order to reduce the change in reluctance in the air gap and reduce noise, it is considered desirable that the minimum width a of the opening of the groove portion 43 be as small as possible (necessary for winding the stator winding). minimum width). In the present invention, in order to suppress the increase of the power supply capacity and realize high torque density, the result of research is that contrary to the conventional idea of reducing the minimum width a of the opening of the groove portion 43, an increase in From the idea that the minimum width a of the opening of the groove portion 43 is better, it was found that it is desirable to satisfy a≧b as described above. the

In the permanent magnet rotating electrical machine satisfying a≥b, further, by satisfying b≥c, stator salient pole 42-air gap 8-rotor magnetic pole 71-permanent magnet 6-adjacent rotor magnetic pole 71-air gap 8 - The magnetic resistance of the magnetic flux path of adjacent stator salient poles 42 becomes smaller. In other words, in a permanent magnet rotating electrical machine satisfying a≥b, in order to reduce the stator salient pole 42-air gap 8-rotor pole 71-permanent magnet 6-adjacent rotor pole 71-air gap 8-phase The reluctance of the magnetic flux path of the adjacent stator salient pole 42 needs to increase the area where the stator salient pole 42 and the rotor pole 71 face each other than the groove portion 43 facing the rotor pole 71 shown in FIG. 3 . In order to achieve this, it is only necessary to satisfy b≥c. Thereby, the magnetic flux generated by the stator winding 5 easily enters the inside of the rotor 3, the leakage magnetic flux is reduced, and the effective magnetic flux contributing to the torque increases. However, when b is extremely increased or c is extremely decreased, although the effective magnetic flux contributing to the torque increases, the resistance to demagnetization of the permanent magnet 6 decreases, and irreversible demagnetization easily occurs. Therefore, by making b and c substantially equal (as equal as possible), it is possible to achieve both reduction in leakage magnetic flux and high torque density while ensuring demagnetization resistance of the permanent magnet. the

And, in a permanent magnet rotating electrical machine that satisfies a≥b, or satisfies a≥b and b≥c, further, by satisfying b≤d, rotor magnetic pole 71-air gap 8-stator salient pole 42-stator core back 41—adjacent stator salient pole 42—air gap 8—adjacent rotor magnetic pole 71 The magnetic resistance of the magnetic flux path 71 decreases. In other words, in a permanent magnet rotating electrical machine that satisfies a≥b, or satisfies a≥b and b≥c, in order to reduce the rotor magnetic pole 71-air gap 8-stator salient pole 42-stator core back 41-stator The reluctance of the magnetic flux path of salient pole 42-air gap 8-rotor pole 71 is not only in the state where the slot 43 is opposite to the rotor pole 71 shown in Figure 3, but also needs to be increased between the stator salient pole 42 and the rotor pole 71. relative area. In order to achieve this, it is only necessary to satisfy b≤d. Accordingly, the magnetic flux generated by the permanent magnet 6 easily enters the inside of the stator 2, thereby increasing the effective magnetic flux that contributes to the torque. However, when b is extremely reduced or d is extremely increased, the leakage component of the magnetic flux returning to the permanent magnet 6 of the rotor via the surface of the stator salient pole 42 increases due to magnetic saturation of the rotor pole 71, and the torque density decreases. . Therefore, by making b and d substantially equal (as equal as possible), both reduction of leakage magnetic flux and high torque density can be achieved. the

In particular, according to the study of the inventors of the present invention, the desired ratio of a, b, c, and d in the embodiment of the present invention is approximately 0.9:0.9:0.7:1.0 (the shape of FIG. 1 ). the

Fig. 4 is a partially enlarged view of a stator core of the permanent magnet rotating electrical machine shown in Fig. 1 . the

As shown in FIG. 4 , protrusions 44 protruding in the circumferential direction are provided on both sides of the front end of the stator salient pole 42 , and the protrusions 44 prevent the stator winding 5 from falling into the air gap 8 . Furthermore, the leakage magnetic flux f1 shown in FIG. 3 is reduced by the chamfering 45 on both sides of the front end of the stator salient pole 42 . That is, in the state of FIG. 3 , since the air gap 8 between the front end side end of the stator salient pole 42 and the front end side end of the rotor magnetic pole 71 can be increased, the stator salient pole 42-air gap 8-rotor The magnetic resistance of the magnetic flux path of the surface of the magnetic pole 71 - the air gap 8 - the adjacent stator salient pole 42 increases, and the leakage magnetic flux f1 can be reduced. Furthermore, the chamfer 45 on both sides of the front end of the stator salient pole 42 can reduce the spatial harmonic component of the magnetic flux density of the air gap 8 and reduce the torque ripple. the

Fig. 5 is a partially enlarged view of a rotor core of the permanent magnet rotating electrical machine shown in Fig. 1 . the

As shown in FIG. 5 , protrusions 73 protruding in the circumferential direction are respectively provided on both sides of the front end of the rotor pole 71 , and the protrusions 73 prevent the permanent magnet 6 from flying out into the air gap 8 due to centrifugal force. Furthermore, the chamfer 74 on both sides of the front end of the rotor magnetic pole 71 can reduce the space harmonic component of the magnetic flux density of the air gap 8 and reduce the torque ripple. the

Fig. 6 shows the simulation of the current-torque characteristics of the permanent magnet rotating electrical machine (the ratio of a, b, c, d is 0.9:0.9:0.7:1.0) of the embodiment of the present utility model (based on edge element finite element The magnetic field analysis of the law) results. In addition, as a comparative example, the simulation results of the current-torque characteristics of a permanent magnet rotating electrical machine (simulating a conventional permanent magnet rotating electrical machine) with ratios of a, b, c, and d of 0.3:1.5:0.8:1.0 are also shown . The torque is standardized by the overload torque, and the current is standardized by the maximum current at the time of the overload torque. In addition, the permanent magnet used is a ferrite magnet of about 0.45T at normal temperature. the

In the configuration of the comparative example, the magnetic flux generated by the stator winding returns to the stator side via the magnetic pole surface of the rotor, and the leakage magnetic flux f1 that does not contribute to the torque becomes large. Furthermore, this leakage magnetic flux becomes the cause of the magnetic saturation of the stator teeth during overload, and the magnetic flux of the permanent magnet does not enter the stator side due to the influence of the magnetic saturation of the teeth, and it becomes torque relative to the torque as shown by the solid line in FIG. Saturation due to increase in current. This leads to a large increase in power supply capacity in the case of an elevator-driven hoist that needs to output a relatively large torque (hundreds to thousands of Nm) at the time of overload. the

On the other hand, the leakage magnetic flux is reduced by the structure of the permanent magnet rotating electric machine according to the embodiment of the present invention. As shown in FIG. 6 , it can be seen that the overload torque is reached at the maximum current at the time of the overload torque. In addition, it can be seen that the saturation of the torque with respect to the increase of the current can be alleviated. That is, with the structure of the permanent magnet rotating electric machine according to the embodiment of the present invention, a current-torque characteristic close to the ideal characteristic can be obtained. Therefore, an increase in power supply capacity can be suppressed, and a permanent magnet rotating electric machine that enables high torque density and low torque ripple can be realized. And by applying this permanent magnet type rotating electrical machine to an elevator drive hoist, it is possible to realize an elevator drive hoist using a magnet with a low magnetic force such as a ferrite magnet. the

【Example 2】

The structure of the permanent magnet type rotating electric machine of 2nd Embodiment of this invention is demonstrated using FIG. 7. FIG. the

7 is an enlarged view of a portion where the rotor and the stator of the permanent magnet rotating electrical machine of the second embodiment of the present invention face each other. Components that are the same as those in the first embodiment shown in FIGS. 1 and 3 are given the same reference numerals and omitted. the

As shown in FIG. 7 , both sides of the front end of the rotor magnetic pole 71 are connected to the rotor core 7 adjacent to the permanent magnet 6 via the bridge portion 75 . Accordingly, the roundness of the outer diameter of the rotor core 7 can be improved, and cogging torque due to manufacturing errors can be reduced. Furthermore, the bridge 75 prevents the permanent magnet 6 from flying out into the air gap 8 due to centrifugal force. However, if the radial thickness of the bridge portion 75 is too thick, the magnetic flux of the permanent magnet 6 flowing through the bridge portion 75 becomes leakage magnetic flux, and the torque decreases. Relatively, if the radial thickness of the bridge portion 75 is too thin, since the bridge portion 75 is damaged by the centrifugal force applied to the permanent magnet 6, it is necessary to prioritize the radial thickness of the bridge portion 75 with the strength of the bridge portion 75. the

Also in this embodiment, as in the first embodiment, a, b, c, and d are configured such that a≧b, b≧c, and b≦d, and the same effects as those in the first embodiment can be achieved. the

[Example 3]

The structure of the permanent magnet type rotating electric machine and the elevator drive hoist using it of 3rd Embodiment of this invention is demonstrated using FIGS. 8-9. the

8 is a schematic cross-sectional view in the radial direction of a 1/6 model (one part divided into six parts in the circumferential direction) of a permanent magnet rotating electrical machine according to a third embodiment of the present invention. Fig. 9 is a schematic axial sectional view of an elevator drive hoist using the permanent magnet rotating electrical machine shown in Fig. 8 . Components that are the same as those in the first embodiment shown in FIG. 1 are assigned the same reference numerals and omitted. Also in the permanent magnet rotating electrical machine shown in FIG. 8 , a, b, c, and d are configured such that a≧b, b≧c, and b≦d are satisfied, as in the first embodiment. the

As shown in FIG. 8 , a dovetail groove 91 is formed on the outer peripheral side of the non-magnetic body 9 constituting the rotor 3 . The dovetail 76 of the rotor core is fitted into the dovetail groove 91 from the axial direction, and the rotor core 7 is fixed to the non-magnetic body 9 . Thereby, the torque acting on the rotor magnetic pole 71 can be transmitted to the non-magnetic body. Furthermore, by using a dovetail to fix the rotor core to a non-magnetic body, the roundness of the outer diameter of the rotor core can be improved, and the cogging torque caused by manufacturing errors can be reduced. the

Bolt holes 92 are provided in the non-magnetic body 9 for fixing to a rotating body 103 described later with bolts 93 . Thereby, the torque transmitted to the non-magnetic body can be transmitted to the outside. Similarly, since reaction torque is also generated in the stator core 4, bolt holes 46 for fixing the stator core to the outside (frame 101 described later) with bolts are provided. It is not necessary to fit bolts into all the bolt holes, and the number of bolts may be determined within a range in which the mechanical strength of the bolts can be maintained. the

Fig. 9 is a schematic axial sectional view of an elevator drive hoist using the permanent magnet rotating electrical machine shown in Fig. 8 . As shown in FIG. 9 , the stator core 4 of the permanent magnet rotating electrical machine is axially fixed to the frame 101 by bolts 47 . The frame 101 is fixed to a base (machine base) in the elevator passage or a base of the uppermost machine room. The rotor core 7 and the non-magnetic body 9 connected as described above are fixed in the rotating body 103 in the axial direction by the bolts 93 . A bearing 105 is interposed between the frame 101 and the rotating body 103 . The rotating body 103 includes: a brake drum 104 for receiving (contacting) a brake shoe of a brake 106 on the outer peripheral side; a sheave 102 for transmitting torque-generated force to a cable; An encoder 107 for controlling the permanent magnet rotating electrical machine. The brake 106 is arranged on the outer peripheral side of the frame 101 . the

By constituting an elevator drive hoist using the permanent magnet type rotating electrical machine shown in FIG. 8 , a thin hoist enabling high torque density and low torque ripple can be realized. the

In addition, the permanent magnet rotating electrical machine of the present invention is not limited to the elevator drive hoist, but can be applied to rotating electrical machines requiring high torque density and low torque ripple, such as servos or electric power steering. the

The above-mentioned utility model is summarized as follows. the

(1) A permanent magnet type rotating electrical machine, characterized by comprising: a stator including a stator core on which a plurality of electromagnetic steel sheets are laminated and a stator winding arranged in a slot of the stator core; The stators face each other across a radial air gap, and in the rotor, a rotor core in which a plurality of electromagnetic steel sheets are laminated and permanent magnets magnetized at right angles to the radial direction are alternately arranged radially. When the minimum width of the opening of the rotor core is a and the width of the front end of the magnetic pole of the rotor core is b, a≥b is satisfied. the

(2) The permanent magnet rotating electric machine according to (1), wherein the shape of the permanent magnet is rectangular, and b≧c is satisfied when the thickness in the magnetization direction is c. the

(3) The permanent magnet rotating electrical machine as described in (1) or (2), is characterized in that: when the minimum width of the stator salient poles of the above-mentioned stator core in the direction at right angles to the radial direction is d, it satisfies b≤d. the

(4) The permanent magnet rotating electric machine according to any one of (1) to (3), wherein protrusions protruding in the circumferential direction are provided on both sides of the front end of the stator salient pole of the stator core. the

(5) The permanent magnet rotating electric machine according to any one of (1) to (4), wherein protrusions protruding in the circumferential direction are provided on both sides of the magnetic pole tip of the rotor core. the

(6) The permanent magnet type rotating electric machine according to any one of (1) to (5), wherein the tip of the stator salient pole of the stator core is chamfered. the

(7) The permanent magnet rotating electric machine according to any one of (1) to (6), wherein the magnetic pole ends of the rotor core are chamfered. the

(8) The permanent magnet type rotating electrical machine described in any one of (1) to (7), wherein the two sides of the front ends of the magnetic poles of the above-mentioned rotor core are respectively connected to the sides of the rotor cores adjacent to the above-mentioned permanent magnets. The side ends of the front ends of the magnetic poles are connected. the

(9) The permanent magnet rotating electrical machine described in any one of (1) to (8), characterized in that it includes an annular non-magnetic body fixed to the rotating shaft of the permanent magnet rotating electrical machine. A dovetail groove is formed on an outer peripheral side of the non-magnetic body, and a dovetail tenon fitted into the dovetail groove from an axial direction is formed on an inner peripheral side of the rotor core. the

(10) The permanent magnet rotating electrical machine described in any one of (1) to (9), wherein a ferrite magnet is used for the permanent magnet. the

(11) An elevator-driven hoist using the permanent-magnet rotating electrical machine described in any one of (1) to (10), wherein the stator is fixed on the frame of the elevator-driven hoist, The rotor is fixed to a rotating body provided with a sheave of the elevator drive hoist. the

In addition, this invention is not limited to the said Example, Various modified examples are included. For example, the above-mentioned embodiment has been described in detail in order to make the present invention easy to understand, and is not limited to all the configurations described above. In addition, a part of the structure of a certain embodiment can be replaced with the structure of another embodiment, and the structure of another embodiment can be added in a certain embodiment. In addition, addition, deletion, and replacement of other configurations can be performed for a part of the configurations of the respective embodiments. the

Symbol Description:

1: Permanent magnet rotating motor

2: Stator

3: Rotor

4: Stator core

41: Stator core back

42: stator salient pole

43: Groove

44: Stator protrusion

45: Stator chamfering

46: Bolt hole

47: Bolt

5: Stator winding

6: permanent magnet

7: Rotor core

71: Rotor poles

72: Magnet insertion space

73: Rotor protrusion

74: Rotor chamfering

75: Bridge Department

76: Dovetail tenon

8: air gap

9: Non-magnetic body

91: Dovetail groove

92: bolt hole

93: Bolt

10: Shaft

100: Elevator drive hoist

101: Rack

102: rope wheel

103: rotating body

104: brake drum

105: Bearing

106: Brake

107: Encoder.

Claims (12)

1. a permanent magnet type electric rotary machine, is characterized in that, comprising:

Stator, it comprises the stator winding in the groove that is laminated with the stator core of multiple electromagnetic steel plates and is configured in described stator core; With

Rotor, it is relative across air gap radially with described stator, and in this rotor, is laminated with the rotor core of multiple electromagnetic steel plates and alternately configures with the permanent magnet being magnetized that radially meets at right angles radially,

Minimum widith at the peristome of described groove is a, when the leading pole tip width of described rotor core is b, meets a >=b.

2. permanent magnet type electric rotary machine as claimed in claim 1, is characterized in that:

Described permanent magnet be shaped as rectangle, in the time that the thickness of the direction of magnetization is c, meet b >=c.

3. permanent magnet type electric rotary machine as claimed in claim 1, is characterized in that:

The stator salient poles of described stator core with radially rectangular direction on minimum widith while being d, meet b≤d.

4. permanent magnet type electric rotary machine as claimed in claim 2, is characterized in that:

The stator salient poles of described stator core with radially rectangular direction on minimum widith while being d, meet b≤d.

5. permanent magnet type electric rotary machine as claimed in claim 4, is characterized in that:

Have in the both sides of the front end of the stator salient poles of described stator core to circumferential outstanding projection.

6. permanent magnet type electric rotary machine as claimed in claim 5, is characterized in that:

Have in the both sides of the leading pole tip of described rotor core to circumferential outstanding projection.

7. permanent magnet type electric rotary machine as claimed in claim 6, is characterized in that:

The front end of the stator salient poles of described stator core is subjected to chamfering.

8. permanent magnet type electric rotary machine as claimed in claim 7, is characterized in that:

The leading pole tip of described rotor core is subjected to chamfering.

9. permanent magnet type electric rotary machine as claimed in claim 8, is characterized in that:

The both sides of the leading pole tip of described rotor core are connected with the side of the leading pole tip across the adjacent rotor core of described permanent magnet respectively.

10. permanent magnet type electric rotary machine as claimed in claim 9, is characterized in that:

Possess the nonmagnetic material of the ring-type on the rotating shaft that is fixed on described permanent magnet type electric rotary machine, be formed with dovetail groove at the outer circumferential side of described nonmagnetic material, be formed with the dovetail from being axially embedded into described dovetail groove in the inner circumferential side of described rotor core.

11. permanent magnet type electric rotary machines as described in any one in claim 1～10, is characterized in that:

Described permanent magnet uses ferrite lattice.

12. 1 kinds of elevator drive elevators, is characterized in that:

This elevator drive elevator right to use requires the permanent magnet type electric rotary machine of recording in 11,

Described stator is fixed in the frame of described elevator drive elevator, and described rotor is fixed on the rotary body that possesses rope sheave of described elevator drive elevator.