JP2013021884A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To directly supply a cooling medium to a coil that is a heat generation source and thereby improving cooling performance of a stator even when the density of a conductive wire is high in a slot.SOLUTION: An electric motor for a lifting gear of an elevator includes a stator and a rotor rotatably supported at the inner side of the stator. The stator includes a hollow cylindrical shaped stator core 5 where an inner peripheral surface 5A opens and multiple slots 5C extending in the axial direction are formed so as to be spaced apart from each other in the circumferential direction and coils attached to the slots 5C. The stator core 5 has cooling passages 5E, each of which is intermittently formed around the slots 5C along the axial direction and supplies air to the surrounding area of the coil.

Description

  The present invention includes a stator having a hollow cylindrical stator core in which a plurality of slots having an inner peripheral surface open and extending in the axial direction are formed at intervals in the circumferential direction, and a coil mounted in the slot. Relates to a rotating electrical machine.

In the conventional electric motor, the stator is cooled so that the insulating coating of the coil, the insulating paper that insulates the coil, and the like are not broken down due to Joule heat generated by passing a current through the coil. As an example of this, an electric motor in which a cooling flow path extending in a direction perpendicular to the rotation center axis is formed between the slot and the outer peripheral surface of the stator core, and a cooling medium is supplied to the slot from the outside of the stator core through the cooling flow path. It is known (see, for example, Patent Document 1).
In the case of this electric motor, the cooling medium supplied to the slot penetrates into the gaps between the copper wires constituting the coil housed in the slot, so that the cooling medium can be positively supplied to the coil that is the heat source and fixed. The child is cooled efficiently.

JP 2005-12989 A

  However, in general, when the output of an electric motor is increased and the size is reduced, the degree of close contact between copper wires constituting the coil or between the copper wire and the slot is increased, and the gaps are reduced accordingly, so that the cooling that passes through the gaps is increased. There is a problem that the cooling efficiency of the stator deteriorates due to a decrease in the amount of the medium.

  An object of the present invention is to solve such a problem, and even when the density of the conductors constituting the coil mounted in the slot is high, the cooling efficiency of the stator is not deteriorated and high cooling is performed. An object of the present invention is to obtain a rotating electrical machine having a stator that ensures efficiency.

A rotating electrical machine according to the present invention includes a stator and a rotor that is rotatably supported inside the stator, and the stator has a plurality of slots that open in an inner peripheral surface and extend in an axial direction. A rotating electrical machine including a hollow cylindrical stator core formed at intervals in the circumferential direction, and a coil mounted in the slot,
The stator core has a cooling passage that is intermittently formed along the axial direction around the slot and supplies a cooling medium to the periphery of the coil.

  According to the rotating electrical machine according to the present invention, the stator core is intermittently formed with cooling channels around the slots along the axial direction, and the cooling medium is supplied to the periphery of the coils through the cooling channels. Even when the density of the conductive wire constituting the coil mounted inside is high, the stator is ensured to have high cooling efficiency.

It is sectional drawing which shows the upper half of the motor for elevator hoists by Embodiment 1 of this invention. It is a perspective view which shows the stator core of FIG. FIG. 2 is a partially cutaway front view showing the stator core of FIG. 1. It is a disassembled perspective view which shows the stator core of FIG. It is a front view which shows the 1st electromagnetic steel plate body of FIG. It is a front view which shows the 2nd electromagnetic steel plate body of FIG. It is a perspective view which shows the stator core of the motor for elevator hoists by Embodiment 2 of this invention. FIG. 8 is a partially cutaway front view showing the stator core of FIG. 7. It is a disassembled perspective view which shows the stator core of FIG. It is a front view which shows the 1st electromagnetic steel plate body of FIG. It is a front view which shows the 2nd electromagnetic steel plate body of FIG.

  Hereinafter, an elevator hoisting motor according to each embodiment of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding members and parts will be described with the same reference numerals.

Embodiment 1 FIG.
1 is a cross-sectional view showing an upper half of a hoisting machine using an elevator hoisting motor (hereinafter abbreviated as an electric motor) according to Embodiment 1 of the present invention.
In this hoisting machine, a sheave 10 is fixed to the end of the shaft 9 of the electric motor.
The electric motor includes a hollow cylindrical frame 7, a stator 1 fixed to the frame 7, and a rotor 2 that is fixed to a shaft 9 inside the stator 1 and is rotatably supported by a bearing 11. And.
The stator 1 includes a hollow cylindrical stator core 5 and a coil 4 attached to the stator core 5.
The rotor 2 has a plurality of permanent magnets 3 fixed to its outer peripheral surface.

The hollow cylindrical starter core 5 shown in FIGS. 2 to 4 is formed with a plurality of slots 5C having an inner peripheral surface 5A open and extending in the axial direction at intervals in the circumferential direction. A copper wire, which is a conducting wire, is wound around each of the teeth 5D that divides the slot 5C through the slot 5C, and the coil 4 is attached to the stator core 5.
The stator core 5 is configured by alternately stacking first electromagnetic steel plate bodies 5G shown in FIG. 5 and second electromagnetic steel plate bodies 5H shown in FIG.
The first electromagnetic steel plate body 5G is formed by laminating a plurality of electromagnetic steel plates and has a slot portion 5C1 that is a component of the slot 5C and is partitioned by the first tooth portion 5D1.
The second electromagnetic steel plate body 5H is formed by laminating a plurality of electromagnetic steel plates and is partitioned by the second tooth portion 5D2, and surrounds the slot portion 5C1 as a component of the slot 5C and the slot portion 5C1. The cooling channel 5E is formed.
The cooling flow path 5E is formed by reducing the width in the circumferential direction of the second tooth portion 5D2 with respect to the first tooth portion 5D1 and increasing the radial dimension of the second tooth portion 5D2.
The second electromagnetic steel sheet body 5H has a radial flow path 5F that extends from the cooling flow path 5E in the radially outward direction and communicates with the outside of the outer peripheral surface 5B of the stator core 5.
Note that the tooth 5D includes a first tooth portion 5D1 and a second tooth portion 5D2.

In this hoisting machine, the shaft 9 and the sheave 10 are rotated clockwise or counterclockwise by the drive of the electric motor, so that the hoisting machine is suspended from a rope (not shown) wound around the sheave 10. A car (not shown) moves up and down.
In the electric motor, the rotor 2 is rotated by energization of the coil 4. At this time, the fan 8 also rotates, and the air that is the cooling medium flowing into the frame 7 from the inlet 7 </ b> A of the frame 7 is mainly the frame 7. And the stator core 5 flows in the direction of arrow A.
Thereafter, a part of the air flows in the radial direction 5F and the cooling flow path 5E in the direction of arrow B, and then flows in the gap between the stator core 5 and the rotor 2 in the direction of arrow C, and the discharge port 7B. It is discharged to the outside of the frame 7 through.
The stator core 5 is fixed to the inner wall surface of the frame 7 but is also partially fixed, and the radial passage 5F is formed in a gap G formed between the stator core 5 and the inner wall surface of the frame 7. The air that is directed and flows through the gap G in the direction of arrow A is reliably guided through the gap G to the radial passage 5F.
Further, a part of the air guided to the cooling flow path 5E in the stator core 5 changes the flow in the axial direction, flows along the slot 5C, passes through the stator core 5, and passes outside the frame 7 through the discharge port 7B. Discharged.

  The second magnetic steel sheet body 5H has the cooling flow paths 5E formed around all the slot portions 5C1, but it is not always necessary to form the cooling flow paths 5E in all the slot portions 5C1. You may make it form the cooling flow path 5E only in 5C1.

According to the electric motor of this embodiment, the stator core 5 is formed with the cooling flow path 5E intermittently along the axial direction around the slot 5C, and the air flows through the cooling flow path 5E to the coil 4 as a heat source. Since the coil 4 is supplied directly to the surroundings, the stator 1 is secured with high cooling efficiency even when the density of the copper wire constituting the coil 4 mounted in the slot 5C is high.
Further, since the cooling flow path 5E is formed so as to surround the entire circumference except for the opening side of the slot 5C of the slot portion 5C1, the contact area between the coil 4 as the heat generation source and the air increases, resulting in higher efficiency. Thus, the coil 4 is cooled.

The stator core 5 is formed by laminating electromagnetic steel plates and having a first electromagnetic steel plate body 5G having a slot portion 5C1, and laminating electromagnetic steel plates, and the slot portion 5C1, cooling channel. 5E and second magnetic steel sheet bodies 5H having radial flow paths 5F are alternately stacked.
Therefore, the flow rate of air flowing through the stator core 5 can be easily adjusted by adjusting the number of electromagnetic steel plates of each of the first electromagnetic steel plate body 5G and the second electromagnetic steel plate body 5H. In cooling the coil 4, it can be circulated in the stator core 5 at an optimum air flow rate.

Embodiment 2. FIG.
7 is a perspective view showing a stator core 6 of an electric motor according to Embodiment 2 of the present invention, FIG. 8 is a partially cutaway front view showing the stator core 6 of FIG. 7, and FIG. 9 is an exploded perspective view showing the stator core 6 of FIG. 10 is a front view showing the first electromagnetic steel plate body 6H of FIG. 9, and FIG. 11 is a front view showing the second electromagnetic steel plate body 6I of FIG.
The hollow cylindrical starter core 6 is formed with a plurality of slots 6C having an inner peripheral surface 6A open and extending in the axial direction, spaced apart in the circumferential direction. A copper wire, which is a conducting wire, is wound around each of the teeth 6D that divides the slot 6C through the slot 6C, and the coil 4 is attached to the stator core 6.

The starter core 6 is configured by alternately laminating a first electromagnetic steel plate body 6H in which a plurality of electromagnetic steel plates are laminated and a second electromagnetic steel plate body 6I in which a plurality of electromagnetic steel plates are laminated. .
The first electromagnetic steel sheet body 6H is a component of the slot 6C and is a first axial flow formed in the slot portion 6C1 defined by the first tooth portion 6D1 and the outer peripheral portion 6B extending in the axial direction. It has a road portion 6F1. The first axial flow path portions 6F1 are formed at equal intervals along the circumferential direction.
The second electromagnetic steel plate body 6I is formed by laminating a plurality of electromagnetic steel plates and is partitioned by the second tooth portion 6D2, and surrounds the slot portion 6C1 that is a component of the slot 6C and the slot portion 6C1. The cooling channel 6E is formed.
The cooling flow path 6E is formed by reducing the width in the circumferential direction of the second tooth portion 6D2 with respect to the first tooth portion 6D1 and increasing the radial dimension of the second tooth portion 6D2.
The second electrical steel sheet body 6I extends in the radially outward direction from the second axial flow path portion 6F2 formed in the outer peripheral portion 6B so as to extend in the axial direction, and from the second axial flow path portion 6F2. The radial flow path 6G is formed. The second axial flow path portion 6F2 is collinear with the first axial flow path portion 6F1.
The tooth 6D includes a first tooth portion 6D1 and a second tooth portion 6D2.
Moreover, the axial direction flow path 6F is comprised by the 1st axial direction flow path part 6F1 and the 2nd axial direction flow path part 6F2.
Although the second magnetic steel sheet body 6I has the cooling flow paths 6E formed around the entire slot portions 6C1, the cooling flow paths 6E are not necessarily formed in the entire slot portions 6C1, and the selected slot portions are not necessarily formed. The cooling flow path 6E may be formed only in 6C1.
Other configurations are the same as those of the electric motor of the first embodiment.

According to the electric motor of this embodiment, the stator core 6 is formed with the cooling flow path 6E intermittently along the axial direction around the slot 6C, and the air flows through the cooling flow path 6E to the coil 4 that is a heat source. Since the coil 4 is supplied directly to the surroundings, the stator 1 is ensured to have high cooling efficiency even when the density of the copper wire constituting the coil 4 mounted in the slot 6C is high.
Further, since the cooling flow path 6E is formed so as to surround the entire circumference except for the opening side of the slot 6C of the slot portion 6C1, the contact area between the coil 4 as the heat generation source and the air increases, and higher efficiency is achieved. Thus, the coil 4 is cooled.

Further, the stator core 6 easily adjusts the amount of air flowing through the stator core 6 by adjusting the number of electromagnetic steel plates of the first electromagnetic steel plate body 6H and the second electromagnetic steel plate body 6I. The air can be circulated in the stator core 5 with an air amount optimal for cooling the coil 4.
In addition, since the first axial flow path portion 6F1 and the second axial flow path portion 6F2 that guide air to the radial flow path 6G are formed in the outer peripheral portion 6B of the stator core 6, the second electromagnetic steel plate body 6I is There is no need to divide between the adjacent second tooth portions 6D2, and the second electromagnetic steel plate body 6I can be handled as one body, the strength is improved, and the first electromagnetic steel plate body 6H and the second electromagnetic steel plate 6I Lamination work with the steel plate body 6I is facilitated as compared with the electric motor of the first embodiment.

In each of the above-described embodiments, the elevator hoist motor has been described. However, the present invention can be applied to other electric motors and also to a generator.
In the first embodiment, the radial flow path 5F that guides air to the cooling flow path 5E is formed in the second electromagnetic steel sheet body 5H. However, the second electromagnetic steel sheet body 5H extends along the axis of the shaft 9. You may make it arrange | position so that the flowing air may collide with the cooling flow path 5E directly perpendicularly. In this case, the radial flow path 5F is unnecessary in the second electromagnetic steel sheet body 5H.
Similarly, in the second embodiment, in the stator core 6, the axial flow path 6 </ b> F and the radial flow path 6 </ b> G that guide air to the cooling flow path 6 </ b> E are formed. It is also possible to arrange the air flowing along the cooling channel 6E so as to directly collide with the cooling channel 6E. In this case, the second magnetic steel sheet body 6I does not require the axial flow path 6F and the radial flow path 6G.
Moreover, although the copper wire was used as a conducting wire, of course, a copper wire is an example and another metal wire may be sufficient.
Further, although air is used as the cooling medium, the present invention can be applied even when, for example, cooling oil is used. When this cooling oil is used, it is necessary to install a circulation pipe with a circulation pump in the frame.

  DESCRIPTION OF SYMBOLS 1 Stator, 2 Rotor, 3 Permanent magnet, 4 Coils, 5, 6 Stator core, 5A, 6A Inner peripheral surface, 5B Outer peripheral surface, 5C, 6C slot, 5C1, 6C1 Slot part, 5D, 6D teeth, 5D1, 6D1 1st teeth part, 5D2, 6D2 2nd teeth part, 5E, 6E cooling flow path, 5F, 6G radial flow path, 5G, 6H 1st electrical steel sheet body, 5H, 6I 2nd electrical steel sheet body, 6 stator core, 6B outer periphery, 6F1 first axial flow path, 6F2 second axial flow path, 7 frame, 8 fan, 7A inlet, 7B drain, 9 shaft, 10 sheave, 11 bearing , G Gap.

Claims (6)

A stator and a rotor rotatably supported inside the stator;
The stator is a rotating electrical machine including a hollow cylindrical stator core having a plurality of slots opened in the axial direction and having an inner peripheral surface open and extending in the circumferential direction, and a coil mounted in the slot. There,
The rotating electrical machine, wherein the stator core is formed intermittently along the axial direction around the slot and has a cooling flow path for supplying a cooling medium to the periphery of the coil. The stator core is formed by laminating electromagnetic steel sheets and has a slot part that is a component of the slot;
The magnetic steel sheet is laminated and formed, and a slot portion which is a component of the slot, the cooling flow passage formed around the slot portion, and an outer peripheral surface extending radially outward from the cooling flow passage. A second electrical steel sheet body having a radial flow path communicating with the outside and guiding the cooling medium to the cooling flow path;
2. The rotating electrical machine according to claim 1, wherein the first electromagnetic steel sheet body and the second electromagnetic steel sheet body are alternately stacked. The stator core is formed by laminating electromagnetic steel plates and has a slot portion which is a component of the slot and a first electromagnetic channel having a first axial flow path formed in the outer peripheral portion so as to extend in the axial direction. A steel plate body;
The magnetic steel sheet is laminated and formed, and a slot portion which is a component of the slot, the cooling flow passage formed around the slot portion, and the first axial flow extending in the axial direction around the outer peripheral portion. A second axial flow path formed in communication with the passage; and a first axial flow path extending in a radially outward direction from the cooling flow path and communicating with the second axial flow path; A second electrical steel sheet body having a radial flow path for guiding the cooling medium from the axial flow path to the cooling flow path,
2. The rotating electrical machine according to claim 1, wherein the first electromagnetic steel sheet body and the second electromagnetic steel sheet body are alternately stacked.   4. The rotating electrical machine according to claim 2, wherein the cooling flow path is formed so as to surround an entire circumference except for an opening side of the slot of the slot portion.   The rotating electrical machine according to claim 1, wherein the cooling medium is air.   The rotating electrical machine according to any one of claims 1 to 5, wherein the rotating electrical machine is an electric motor for an elevator hoisting machine.

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