Outer rotation type rotary electric machine and hoist

Abstract

To provide an outer rotation type rotary electric machine capable of suppressing deformation of an attachment surface of a brake due to temperature rising of a frame.SOLUTION: An outer rotation type rotary electric machine has a drum having a rotor core and a permanent magnet, a stator having a stator core and an armature winding, and a frame on which the stator is attached and a brake attachment surface is formed. The frame has a rib which is formed on a frame external surface located on an opposite side to the stator and which extends along an axis line on the axis line perpendicular to the brake attachment surface.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to an outer-rotor type rotating electric machine and a hoist.

Background Art

[0002] As a hoist for an elevator, a hoist equipped with an outer-rotor type rotating electric machine is known. The outer-rotor type rotating electric machine has a configuration in which a stator core is arranged on the inner peripheral side of a rotor core. Regarding a hoist equipped with an outer-rotor type rotating electric machine, for example, the technique described in Patent Document 1 is known.

[0003] Patent Document 1 describes, "An outer-rotor type rotating electric machine having a shaft, a rotor frame rotatable around the axis center of the shaft, a rotor including a rotor core and a permanent magnet attached to the inner peripheral side of the rotor frame, a stator frame provided around the shaft, and a stator including a stator core and a coil disposed on the inner diameter side of the rotor with a predetermined gap from the permanent magnet and attached to the stator frame, the outer-rotor type rotating electric machine having heat dissipation fins extending in parallel with the shaft from the inside of the stator beyond the outer surface of the stator frame, and fixing the heat dissipation fins outside the stator frame."

[0004] A general rope-type elevator mainly has a configuration including a hoist, a rope, a car, and a counterweight. Further, the hoist of the elevator has a configuration including a rotating electric machine, a sheave (pulley), and a brake. The rope is fed out by the sheave in order to raise and lower the car. The sheave rotates together with a drum integrated with the rotor of the rotating electric machine. The brake is attached to a frame covering the stator of the rotating electric machine. Further, the brake includes a brake shoe, a spring, and an electromagnet.

[0005] When the elevator stops the car, the brake of the hoist contacts the outer peripheral portion of the drum with a predetermined force, and the drum is stopped by the frictional force generated at this contact portion. At this time, the brake shoe is pressed against the outer peripheral portion of the drum by the repulsive force of the spring. Also, when the elevator raises and lowers the car, the brake shoe is attracted together with the core of the brake by the electromagnetic force generated by the electromagnet to release the drum. At this time, the spring is compressed by the electromagnetic force of the electromagnet.

[0006] Normally, the brake provided in the hoist of the elevator has a predetermined brake gap between the brake and the drum in order to release the drum during operation (while the car is moving). Also, the brake is attached to the brake mounting surface of the frame.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0008] The temperature of the frame provided in the outer-rotor type rotating electric machine rises due to heat generation caused by losses (such as iron loss and copper loss) of the outer-rotor type rotating electric machine. When the temperature of the frame rises, the frame itself is deformed by the thermal expansion of the frame, and the brake mounting surface is displaced. As a result, the dimension of the brake gap between the brake and the drum changes, or the way the brake hits the drum changes. Therefore, the displacement of the brake mounting surface accompanying the temperature rise of the frame causes, for example, a decrease in the braking force and an increase in the brake operating noise, which contributes to the deterioration of the riding comfort of the elevator.

[0009] An object of the present invention is to provide an outer-rotor type rotating electric machine and a hoist capable of suppressing the displacement of the brake mounting surface accompanying the temperature rise of the frame.

Means for Solving the Problem

[0010] To solve the above problems, for example, the configurations described in the claims are adopted. This application includes a plurality of means for solving the above problems. If one of them is mentioned, it is an outer-rotor type rotating electric machine including a drum having a rotor core and a permanent magnet attached to the inner peripheral surface of the rotor core, a stator having a stator core disposed on the inner peripheral side of the rotor core and an armature winding wound around the stator core, and a frame to which the stator is attached and on which a brake mounting surface is formed. The frame has a rib formed on the outer surface of the frame located on the side opposite to the stator, and the rib extends along the axis perpendicular to the brake mounting surface.

Advantages of the Invention

[0011] According to the present invention, displacement of the brake mounting surface due to temperature rise of the frame can be suppressed. Problems, configurations, and effects other than those described above will be clarified by the description of the following embodiments.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiments for Carrying Out the Invention

[0013] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In this specification and the drawings, elements having substantially the same function or configuration are denoted by the same reference numerals, and duplicate descriptions are omitted as appropriate. Also, the following description and drawings are examples for explaining the present invention, and may be omitted and simplified for convenience of explanation. Each component may be singular or plural unless otherwise specifically limited. Also, the positions, sizes, shapes, ranges, etc. of the components shown in the drawings may not represent the actual positions, sizes, shapes, ranges, etc. in order to facilitate understanding of the invention.

[0014] <First Embodiment> FIG. 1 is a cross-sectional view showing a configuration example of a hoist equipped with an outer-rotor type rotating electric machine according to the first embodiment. FIG. 2 is a rear view of the hoist equipped with the outer-rotor type rotating electric machine according to the first embodiment. FIG. 3 is a front view of the hoist equipped with the outer-rotor type rotating electric machine according to the first embodiment. In FIG. 1, a cross-section of the upper half portion of the shaft 14 with respect to the central axis J is shown. Also, in FIG. 1, some illustrations such as the brake 12 (see FIGS. 2 and 3) are omitted.

[0015] Also, in FIGS. 1 to 3, the direction parallel to the central axis J of the shaft 14 is defined as the Z direction, one of the two orthogonal directions perpendicular to the Z direction is defined as the X direction, and the other is defined as the Y direction. The X direction is a direction parallel to the width direction of the hoist, the Y direction is a direction parallel to the height direction of the hoist, and the Z direction is a direction parallel to the depth direction of the hoist. The X direction, Y direction, and Z direction are common in the subsequent figures.

[0016] As shown in FIGS. 1 to 3, the hoist 10 according to the first embodiment includes an outer-rotor type rotating electric machine 11, a brake 12 (see FIGS. 2 and 3), and a sheave 13 (see FIGS. 1 and 2).

[0017] (Outer-rotating type rotating electrical machine) As shown in Fig. 1, the outer-rotating type rotating electrical machine 11 includes a shaft 14, a drum 15, a stator 16, and a frame 17. The shaft 14 is a cylindrical shaft that serves as the main shaft of the outer-rotating type rotating electrical machine 11. The shaft 14 is fixed to the frame 17. The frame 17 is formed to cover the stator 16 and the rotor core 18. The rotor core 18 is covered by the outer peripheral portion 17a of the frame 17. A predetermined brake gap G1 is formed between the outer peripheral surface of the rotor core 18 and the inner peripheral surface of the outer peripheral portion 17a.

[0018] The drum 15 has a rotor core 18 and permanent magnets 19. The rotor core 18 is constituted by a part of the drum 15. In other words, the rotor core 18 has an integral structure with the drum 15. The rotor core 18 is formed in an annular shape. The rotor core 18 is formed, for example, by machining a drum 15 made of a cast magnetic material with a lathe or the like. Further, a sheave mounting surface 21 is formed on the drum 15. The sheave mounting surface 21 is a surface for mounting the sheave 13 to the frame 17. The sheave mounting surface 21 is formed in a circular shape when viewed from the Z direction.

[0019] The permanent magnets 19 are attached to the inner peripheral surface of the rotor core 18. The permanent magnets 19 are arranged in the circumferential direction so that the magnetic poles alternate. The number of permanent magnets 19 attached to the rotor core 18 and the number of magnetic poles formed by the permanent magnets 19 can be arbitrarily changed. The material of the permanent magnets 19 may be any of a ferrite magnet type, a neodymium magnet type, a samarium cobalt magnet type, etc. Further, the permanent magnets 19 may be fixed to the rotor core 18, for example, by adhesion, or may be fixed to the rotor core 18 by other fixing means. The rotor core 18 of the drum 15 faces the stator 16 with a predetermined gap G2 therebetween.

[0020] The drum 15 is rotatably supported on the shaft 14 via the bearing 20. Therefore, the drum 15 having the rotor core 18 rotates about the central axis J of the shaft 14. The central axis of the drum 15 having the rotor core 18 and the central axis of the frame 17 both coincide with the central axis J of the shaft 14.

[0021] The stator 16 has a stator core 22 and an armature winding 23. The stator 16 is attached to the frame 17. The stator core 22 is composed of a processed magnetic material. Specifically, the stator core 22 may be composed of, for example, a core processed from cast iron, or may be composed of a laminated core of a magnetic material formed into an arbitrary shape by press working or laser processing. The stator core 22 is disposed on the inner circumferential side of the rotor core 18. The armature winding 23 is wound around the stator core 22. Specifically, the armature winding 23 is attached to the stator core 22 by concentrated winding. The number of armature windings 23 can be arbitrarily changed.

[0022] As the material of the magnetic material constituting the stator core 22, generally a thin silicon steel sheet is used, but the present invention is not limited to this. Further, the stator core 22 may be an integral core in which the core is not divided in the axial direction, or may be a divided core divided into a plurality in the circumferential direction.

[0023] The armature winding 23 is composed of, for example, a conducting wire coated with an insulating film on an electric conductor mainly composed of copper. The insulating film is composed of, for example, enamel, engineering plastic, or the like. Also, although not shown, the armature winding 23 is concentratedly wound around the stator core 22 via a bobbin formed of resin. Further, the armature winding 23 is fixed by impregnating with a resin such as varnish after being wound around the stator core 22. Also, the armature winding 23 may be fixed by heat treatment using a self-fusing wire provided with a fusing layer having an adhesive effect on the insulating film.

[0024] Frame 17 is formed, for example, by machining cast metal with a lathe or the like. In addition to the outer contour portion 17a described above, the frame 17 has a brake mounting surface 25 (see FIGS. 2 and 3). The brake mounting surface 25 is a surface for attaching the brake 12 to the frame 17. The brake mounting surface 25 is formed on the shoulder portion of the frame 17. Further, the brake mounting surface 25 is formed in a state of being inclined obliquely at a predetermined angle with respect to the X direction. The brake mounting surface 25 is not limited to the shoulder portion of the frame 17 and may be formed on other portions of the frame 17, for example, on the side surface portion of the frame 17.

[0025] (Brake) Two brakes 12 are attached to one hoisting machine 10. The brake 12 is fixedly attached to the brake mounting surface 25 of the frame 17. One brake 12 may be attached to one hoisting machine 10. In that case, the number of brake mounting surfaces 25 formed on the frame 17 may also be one.

[0026] As shown in FIG. 2, the brake 12 includes a brake fixed portion 41, a brake movable portion 42, and a brake shoe 43. The brake shoe 43 is fixed to the brake movable portion 42. Although not shown, the brake 12 includes a spring and an energizable electromagnetic coil inside. The electromagnetic coil is housed in a groove in the brake fixed portion 41. Both the brake fixed portion 41 and the brake movable portion 42 are made of processed magnetic material. The brake shoe 43 is made of processed metal (for example, cast metal or aluminum). A lining (not shown) is fixed to the contact surface of the brake shoe 43 with respect to the drum 15. The lining is made of a material having a large coefficient of friction. Specifically, the lining is made of, for example, a resin containing metal powder and fiber material, or a metal obtained by sintering metal powder.

[0027] The brake 12 has a brake gap G1 between the brake shoe 43 and the outer peripheral surface of the drum 15 (rotor core 18). The brake movable part 42 can press the brake shoe 43 against the drum 15 by the repulsive force of the spring described above. Further, when the electromagnetic coil described above is energized, the brake movable part 42 can be pulled toward the brake fixed part 41 against the repulsive force of the spring, so that the brake shoe 43 can be separated from the drum 15. At this time, the dimension of the brake gap G1 varies with the movement of the brake shoe 43. Specifically, the dimension of the brake gap G1 becomes substantially zero by pressing the brake shoe 43 against the drum 15, that is, the brake shoe 43 is in contact with the outer peripheral surface of the drum 15. Thereby, a frictional force is generated on the contact surface between the brake shoe 43 and the drum 15. Therefore, the rotation of the drum 15 can be stopped. Also, the dimension of the brake gap G1 becomes larger than zero by separating the brake shoe 43 from the drum 15, that is, the brake shoe 43 is in a state of being separated from the drum 15. Thereby, the braking force by the brake 12 can be released and the drum 15 can be released (rotated).

[0028] (sheave) The sheave 13 is arranged on the back side of the hoist 10. The sheave 13 is attached to the sheave mounting surface 21 of the drum 15. Specifically, the sheave 13 is fitted and fixed to the drum 15. The sheave 13 rotates integrally with the drum 15. A rope 27 is wound around the sheave 13. The rope 27 is a rope for raising and lowering a cage (not shown). The rope 27 is fed out in a predetermined direction as the sheave 13 rotates. Specifically, for example, when raising the cage, the sheave 13 rotates in the clockwise direction as viewed from the Z direction, and the rope 27 is fed out in the first direction as the sheave 13 rotates. On the other hand, when lowering the cage, the sheave 13 rotates in the counterclockwise direction as viewed from the Z direction, and the rope 27 is fed out in the second direction (opposite to the first direction) as the sheave 13 rotates.

[0029] The configuration of the frame 17 will be described again with reference to FIGS. 3 and 4. FIG. 4 is a cross-sectional view taken along the line A-A of the frame 17 in FIG. 3. As shown in FIGS. 3 and 4, the frame 17 has a plurality of ribs 31. In this embodiment, as an example, four ribs 31 are provided on the frame 17. The ribs 31 enhance the rigidity of the frame 17 in order to suppress the displacement of the brake mounting surface 25 due to the temperature rise (thermal expansion) of the frame 17. At least one rib 31 is provided for each brake mounting surface 25.

[0030] The rib 31 is formed on the outer surface 32 of the frame located on the side opposite to the stator 16 (see FIG. 1). The outer surface 32 of the frame is a surface arranged facing the front side (outside) of the hoist 10. Also, the outer surface 32 of the frame is the widest plane of the frame 17 when the frame 17 is viewed from the front direction. However, the outer surface 32 of the frame may have some inclination or surface roughness. The rib 31 is formed to protrude outward from the outer surface 32 of the frame in a direction parallel to the central axis J (see FIG. 1) of the shaft 14. Also, the rib 31 is formed integrally with the frame 17.

[0031] The rib 31 is formed on an axis 33 perpendicular to the brake mounting surface 25 of the frame 17. Although there are a plurality (many) of axes perpendicular to the brake mounting surface 25, only one axis 33, which is one of the plurality of axes, is shown in FIG. 3. The same applies to other embodiments described later.

[0032] The rib 31 is formed in a state of extending along the axis 33. The rib 31 is formed in a rectangular shape when the frame 17 is viewed from the front direction. The rib 31 has a substantially cuboid shape when viewed as the rib 31 alone excluding the frame 17. The longitudinal direction of the rib 31 is parallel to the axis 33, and the short-side direction of the rib 31 is perpendicular to the axis 33. Also, the rib 31 is disposed on the axis 33 passing through the rotation center 34 of the rotor core 18. The rotor core 18 rotates about the central axis J of the shaft 14. For this reason, the rotation center 34 of the rotor core 18 is also the position of the central axis J of the shaft 14. Also, since the rotor core 18 is a part of the drum 15, the rotation center 34 of the rotor core 18 is also the rotation center of the drum 15.

[0033] The height dimension H of the rib 31 with reference to the outer frame surface 32 of the frame 17 is preferably set in the range of 1.5 to 2.0 times the thickness dimension T of the frame 17 around the rib 31. The height dimension H of the rib 31 may also be referred to as the protruding dimension of the rib 31. Also, the corners of the rib 31 may be chamfered or rounded.

[0034] Here, when the hoist 10 of the elevator is operated, losses (such as iron loss and copper loss) associated with energization occur in the stator core 22, armature winding 23, and permanent magnet 19 respectively, and each component generates heat as a result. Then, including the influence of the outside air, the frame 17 thermally expands, and thereby the brake mounting surface 25 tends to be displaced. At that time, each rib 31 functions to increase the rigidity of the frame 17 (particularly, the outer frame surface 32 portion) like a so-called beam. For this reason, warping of the outer frame surface 32 can be suppressed.

[0035] Further, the rib 31 is formed on an axis 33 perpendicular to the brake mounting surface 25 of the frame 17. Therefore, due to the presence of the rib 31, the second moment of area with respect to the bending of the frame outer surface 32 portion is improved. Accordingly, even if the frame 17 thermally expands due to a temperature rise, the frame outer surface 32 portion is less likely to undergo bending deformation. Thereby, the displacement of the brake mounting surface 25 accompanying the temperature rise of the frame 17 can be suppressed. As a result, a decrease in the braking force caused by the displacement of the brake mounting surface 25 and an increase in the braking operation noise can be suppressed, and the riding comfort of the elevator can be improved. Such an effect becomes more prominent when the rib 31 is arranged on the axis 33 passing through the rotation center 34 of the rotor core 18.

[0036] Further, the rib 31 is a metal integrally formed with the frame 17. Therefore, the rib 31 has high thermal conductivity. Also, when the rib 31 is formed on the frame outer surface 32, the surface area of the frame 17 including the rib 31 increases as compared with the case where the rib 31 is not formed on the frame outer surface 32. Accordingly, the heat dissipation property of the frame 17 can be improved by heat dissipation from the surface of the rib 31 and heat dissipation from the frame outer surface 32. As a result, the thermal expansion of the frame 17 can be reduced.

[0037] Further, the outer-rotor type rotating electrical machine described in the above-mentioned Patent Document 1 includes a heat-radiating fin having a fin heat-absorbing portion disposed inside the stator and a fin heat-radiating portion disposed to be exposed to the outside, and adopts a configuration in which this heat-radiating fin is fixed outside the frame. When cooling members such as cooling fins are added in this way, it leads to an increase in the number of parts of the outer-rotor type rotating electrical machine and also causes the outer-rotor type rotating electrical machine to become larger and heavier. As a result, not only does the cost of the outer-rotor type rotating electrical machine increase, but also the costs of mounting and transporting the outer-rotor type rotating electrical machine become higher.

[0038] On the other hand, the outer-rotor type rotating electrical machine 11 according to the present embodiment forms the rib 31 integrally with the frame 17, and the presence of this rib 31 can improve the heat dissipation of the frame 17 (particularly, the outer surface 32 of the frame). Therefore, compared with the outer-rotor type rotating electrical machine described in Patent Document 1, the number of parts can be reduced, and the costs of attachment and transportation associated with the increase in size and weight of the outer-rotor type rotating electrical machine 11 can be reduced.

[0039] <Second Embodiment> FIG. 5 is a front view of a hoist including an outer-rotor type rotating electrical machine according to the second embodiment. As shown in FIG. 5, the hoist 10A according to the second embodiment has different numbers and arrangements of ribs formed on the frame 17 of the outer-rotor type rotating electrical machine 11 compared with the hoist 10 according to the first embodiment described above. This will be described in detail below.

[0040] On the outer surface 32 of the frame 17 of the frame 17, a plurality of ribs 51 and a plurality of ribs 52 are formed. The plurality of ribs 51 are formed integrally with the frame 17, and the plurality of ribs 52 are also formed integrally with the frame 17. Further, the plurality of ribs 51 are formed on the axis 33 passing through the rotation center 34 of the rotor core 18 described above and perpendicular to the brake mounting surface 25. Further, the rib 51 is formed in a state of extending along the axis 33.

[0041] On the other hand, the plurality of ribs 52 are formed on an axis (not shown) perpendicular to the brake mounting surface 25 in a state of extending along the axis. Further, for each one rib 51, three ribs 52 are formed on both sides of the rib 51. One rib 51 and a total of six ribs 52 arranged on both sides of the rib 51 are arranged side by side at a predetermined interval in a direction parallel to the brake mounting surface 25. The ribs 51 and 52 have the same shape. Specifically, the shapes of the ribs 51 and 52 are rectangular when the frame 17 is viewed from the front direction.

[0042] In the second embodiment, since a plurality of ribs 51 and a plurality of ribs 52 are formed on the outer frame surface 32 of the frame 17, the rigidity of the frame 17 (particularly, the portion of the outer frame surface 32) can be increased as compared with the case of the first embodiment (see FIG. 3). Therefore, the displacement of the brake mounting surface 25 accompanying the temperature rise of the frame 17 can be suppressed more effectively. Further, the ribs 51 and 52 are arranged side by side in a direction parallel to the brake mounting surface 25. Therefore, the rigidity of the frame 17 (particularly, the portion of the outer frame surface 32) can be increased over a wide range.

[0043] Also, the length L (mm) of the rib 51 in the radial direction of the shaft 14 and the drum 15 (see FIG. 1) is larger than the width W (mm) of the rib 51 perpendicular to the radial direction. The same applies to the magnitude relationship between the length and width of the rib 52. Thereby, more ribs 51 and 52 can be provided on the outer frame surface 32 of the frame 17. Therefore, the surface area of the frame 17 including the ribs 51 and 52 can be enlarged, and the heat dissipation of the frame 17 can be improved.

[0044] <Third Embodiment> FIG. 6 is a front view of a hoist provided with an outer-rotor type rotating electric machine according to the third embodiment. As shown in FIG. 6, the hoist 10B according to the third embodiment differs in the number and arrangement of ribs formed on the frame 17 of the outer-rotor type rotating electric machine 11 as compared with the hoist 10 according to the first embodiment described above. This will be described in detail below.

[0045] On the outer frame surface 32 of the frame 17, a plurality of ribs 61 and a plurality of auxiliary ribs 62 are formed. The plurality of ribs 61 are integrally formed with the frame 17, and the plurality of auxiliary ribs 62 are also integrally formed with the frame 17. Further, the plurality of ribs 61 are formed on an axis 33 that passes through the rotation center 34 of the rotor core 18 described above and is perpendicular to the brake mounting surface 25. Also, the rib 61 is formed in a state of extending along the axis 33. In the present embodiment, as an example, four ribs 61 are provided on the frame 17. Therefore, any rib other than the four ribs 61 is an auxiliary rib 62.

[0046] The plurality of auxiliary ribs 62 are arranged side by side in the circumferential direction along the rotation direction of the rotor core 18 (see FIG. 1) together with the plurality of ribs 61 described above. Also, the plurality of ribs 61 and the plurality of auxiliary ribs 62 are arranged radially around the rotation center 34 of the rotor core 18. The auxiliary rib 62 is formed between the ribs 61 adjacent to each other in the circumferential direction among the plurality (four in this embodiment) of ribs 61 described above. In this case, the circumferential direction corresponds to a predetermined direction.

[0047] The intervals between the ribs 61 and the auxiliary ribs 62 adjacent to each other in the circumferential direction, and the intervals between the auxiliary ribs 62 adjacent to each other in the circumferential direction are all the same. That is, the plurality of ribs 61 and the plurality of auxiliary ribs 62 are arranged at equal intervals in the circumferential direction. In FIG. 6, the plurality of ribs 61 and the plurality of auxiliary ribs 62 are continuously arranged in the circumferential direction. However, for example, if there is a portion on the outer frame surface 32 where ribs cannot be formed for some reason, the arrangement of the ribs 61 and the auxiliary ribs 62 may be interrupted in a part of the circumferential direction corresponding to that portion.

[0048] The rib 61 and the auxiliary rib 62 have the same shape. Specifically, the shapes of the rib 61 and the auxiliary rib 62 are rectangular when the frame 17 is viewed from the front direction. Also, the relationship between the length and width of the rib 61 is the same as the relationship between the length and width of the rib 51 in the second embodiment described above. Also, the relationship between the length and width of the auxiliary rib 62 is the same as the relationship between the length and width of the rib 51 in the second embodiment described above.

[0049] Figure 7 is an enlarged view of a part of the hoisting machine shown in Figure 6. In Figure 7, when the frame 17 is viewed from the Z direction, the stator 16 disposed inside the frame 17 (on the back side of the outer surface 32 of the frame) is shown by a transparent projection. Also, in Figure 7, a symbol 65 is attached to the projection surface (quadrilateral portion) of the armature winding 23 of the stator 16. However, in Figure 7, only a part (two in Figure 7) of the projection surfaces 65 of the plurality of armature windings 23 arranged at predetermined intervals in the circumferential direction are shown.

[0050] As shown in Figure 7, the rib 61 and the auxiliary rib 62 are arranged on the outer surface 32 of the frame in a state of partially overlapping the projection surface 65 of the armature winding 23. Also, among the plurality of auxiliary ribs 62, some of the auxiliary ribs 62 are arranged between the projection surfaces 65 of the armature windings 23 adjacent to each other in the circumferential direction, and the other auxiliary ribs 62 and the rib 61 are both arranged in a state of partially overlapping the projection surface 65 of the armature winding 23. That is, there are a plurality of ribs 61 and auxiliary ribs 62 that partially overlap the projection surface 65 of the armature winding 23 in the circumferential direction. For example, among the total number of ribs including the rib 61 and the auxiliary ribs 62, half of the ribs are arranged in a state of overlapping the projection surface 65 of the armature winding 23.

[0051] In this way, by forming a plurality of ribs 61 and a plurality of auxiliary ribs 62 on the outer surface 32 of the frame 17, the rigidity of the frame 17 can be increased as compared with the case of the first embodiment (see Figure 3). For this reason, the displacement of the brake mounting surface 25 accompanying the temperature rise of the frame 17 can be more effectively suppressed. Also, by arranging the plurality of ribs 61 and the plurality of auxiliary ribs 62 side by side in the circumferential direction, the rigidity of the frame 17 can be improved in multiple directions. Also, due to the presence of the plurality of auxiliary ribs 62 arranged in the circumferential direction, the surface area of the frame 17 can be enlarged, and the heat dissipation performance of the frame 17 can be improved.

[0052] Further, in the third embodiment, the ribs 61 and the auxiliary ribs 62 are arranged on the outer surface 32 of the frame in a state where they partially overlap with the projection surface 65 of the armature winding 23. Therefore, the ribs 61 and the auxiliary ribs 62 are arranged at the shortest positions from the armature winding 23 serving as a heat generation source, and the heat generated by the armature winding 23 can be efficiently released from the rib surfaces and the outer surface 32 of the frame.

[0053] <Fourth Embodiment> FIG. 8 is a front view of a hoist provided with an outer-rotor type rotating electric machine according to the fourth embodiment. As shown in FIG. 8, the hoist 10C according to the fourth embodiment has a different rib shape formed on the frame 17 of the outer-rotor type rotating electric machine 11 compared to the hoist 10B according to the above-described third embodiment. This will be described in detail below.

[0054] A plurality of ribs 71 and a plurality of auxiliary ribs 72 are formed on the outer surface 32 of the frame 17. The plurality of ribs 71 are integrally formed with the frame 17, and the plurality of auxiliary ribs 72 are also integrally formed with the frame 17. The plurality of ribs 71 and the plurality of auxiliary ribs 72 are arranged side by side in the circumferential direction, similar to the plurality of ribs 61 and the plurality of auxiliary ribs 62 in the above-described third embodiment.

[0055] The ribs 71 and the auxiliary ribs 72 have the same shape. Specifically, the ribs 71 and the auxiliary ribs 72 are trapezoidal when the frame 17 is viewed from the front direction. Further, the ribs 71 and the auxiliary ribs 72 are formed such that the rib width gradually widens from the radially inner side toward the radially outer side. Therefore, taking the rib 71 as an example, the width Wa (mm) of the rib 71 on the radially outer side is larger than the width Wb (mm) of the rib 71 on the radially inner side. This is the same for the auxiliary rib 72. The radial direction corresponds to the radial direction of the shaft 14, the radial direction of the drum 15 (see FIG. 1), and the like.

[0056] Thus, by forming a plurality of ribs 71 and a plurality of auxiliary ribs 72 on the outer surface 32 of the frame 17 of the frame, the same effects as those of the third embodiment described above can be obtained. Further, in the fourth embodiment, the ribs 71 and the auxiliary ribs 72 are formed such that the rib width gradually increases from the radially inner side toward the radially outer side. As a result, the cross-sectional area of the rib 71 and the cross-sectional area of the auxiliary rib 72 each expand from the radially inner side toward the radially outer side. For this reason, a larger sectional secondary moment can be obtained on the radially outer side where a large bending moment is applied due to the temperature rise of the frame 17. Therefore, the deformation of the frame 17 accompanying the temperature rise can be suppressed more effectively. Further, in the fourth embodiment, compared with the third embodiment described above, the ribs 71 and the auxiliary ribs 72 can be formed by extending them longer in the radial direction, respectively. For this reason, further improvement in the rigidity and heat dissipation of the frame 17 can be achieved.

[0057] <Modification examples, etc.> Note that the present invention is not limited to the above-described embodiments and includes various modification examples. For example, in the above-described embodiments, the present invention has been described in detail for easy understanding, but the present invention is not necessarily limited to having all the configurations described in the above-described embodiments. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment. In addition, the configuration of another embodiment can be added to the configuration of one embodiment. Further, a part of the configuration of each embodiment can be deleted, another configuration can be added, or it can be replaced with another configuration.

[0058] For example, in each of the above-described embodiments, an example in which the ribs and the auxiliary ribs are formed integrally with the frame 17 has been shown, but the present invention is not limited to this, and the ribs and / or the auxiliary ribs may be joined to the frame 17 by, for example, welding or the like.

Explanation of reference numerals

[0059] 10, 10A, 10B, 10C… winch, 11… outer-rotating type rotating electric machine, 12… brake, 13… sheave, 14… shaft, 15… drum, 16… stator, 17… frame, 18… rotor core, 19… permanent magnet, 22… stator core, 23… armature winding, 25… brake mounting surface, 27… rope, 31, 51, 52, 61, 71… rib, 32… outer surface of frame, 33… axis, 34… center of rotation, 62, 72… auxiliary rib, 65… projection plane

Claims

1. An outer rotor type rotating electric machine comprising: a drum having a rotor core and a permanent magnet attached to an inner peripheral surface of the rotor core; a stator having a stator core disposed on the inner peripheral side of the rotor core and an armature winding wound around the stator core; and a frame to which the stator is attached and on which a brake mounting surface is formed, The frame has a rib formed on an outer surface of the frame located on the opposite side to the stator, the rib extending along an axis perpendicular to the brake mounting surface. External rotor type rotating motor.

2. The rib is integrally formed with the frame.

2. An outer rotor type rotating electric machine according to claim 1.

3. The rib is disposed on an axis passing through the center of rotation of the rotor core.

2. An outer rotor type rotating electric machine according to claim 1.

4. A plurality of the ribs are formed on the outer surface of the frame.

2. An outer rotor type rotating electric machine according to claim 1.

5. The plurality of ribs are arranged in a direction parallel to the brake mounting surface.

5. An outer rotor type rotating electric machine according to claim 4.

6. An auxiliary rib is formed on the outer surface of the frame between adjacent ribs in a predetermined direction among the plurality of ribs.

5. An outer rotor type rotating electric machine according to claim 4.

7. The ribs and the auxiliary ribs are each formed in a plurality of pieces and are arranged in a circumferential direction along the rotation direction of the rotor core.

7. An outer rotor type rotating electric machine according to claim 6.

8. The rib and the auxiliary rib are disposed on the outer surface of the frame so as to partially overlap a projection surface of the armature winding.

7. An outer rotor type rotating electric machine according to claim 6.

9. The rib and the auxiliary rib are formed so that the rib width gradually increases from the radially inner side toward the radially outer side.

7. An outer rotor type rotating electric machine according to claim 6.

10. an outer rotor type rotating electric machine including: a drum having a rotor core and a permanent magnet attached to an inner peripheral surface of the rotor core; a stator having a stator core disposed on the inner peripheral side of the rotor core and an armature winding wound around the stator core; and a frame to which the stator is attached and on which a brake mounting surface is formed; a brake attached to the brake attachment surface of the frame to suppress rotation of the drum; A hoisting machine including: a sheave attached to the drum, rotating integrally with the drum, and around which a rope is wound, The frame has a rib formed on an outer surface of the frame located on the opposite side to the stator, the rib extending along an axis perpendicular to the brake mounting surface. Hoisting machine.

Images