JP2017159984A - Winch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a winch which is improved in cooling effect.SOLUTION: One ring-shaped rib 43 comprising a ventilation hole 43a and a plurality of radial ribs 44 are provided between a rim 41 and boss 42 of a driving steel vehicle 40. A suction hole H is formed at an end surface cover part 22c of a motor cover part 22 which covers an electric motor 50 and a stator holding member 23 is arranged between an inner periphery cover part 22b and a stator iron core 56 so as to form a ventilation path V. When the driving steel vehicle 40 rotates, action of a centrifugal fan is caused by the radial rib 44, so that air is flown into the inner periphery side of a stator 55 and the driving steel vehicle 40 to cool a winch.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a cooling structure for an outer rotor / gearless hoist used in an elevator or the like.

When the outer rotor type motor is used for the gearless hoisting machine using the permanent magnet type synchronous motor, the stator is arranged on the inner diameter side of the rotor. A permanent magnet is disposed on the rotor, and a stator winding is disposed on the stator. Since current flows through the stator windings, the stator generates a large amount of heat. Since the stator having a large amount of heat generated is arranged on the inner peripheral side of the rotor, the cooling performance of the electric motor tends to be lowered.
Specifically, there is a possibility that sufficient cooling cannot be performed due to the reason that the area of the electric motor that is in contact with the outside contributes to cooling is small, and that a large space fan cannot be attached because the space is small. As a result, if the temperature exceeds the allowable value due to insufficient cooling, problems such as coil burnout and permanent magnet demagnetization may occur.

As a cooling technique for such an outer rotor type hoisting machine, there is one disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2005-104620). This patent document 1 discloses the following technique.
(1) A technique in which a plurality of heat dissipating fins are provided on the inner peripheral side of the stator, and heat generated in the stator is conducted to the heat dissipating fins to dissipate heat. The cooling is performed by natural convection (first technique).
(2) An opening that communicates with the outside is provided on the inner peripheral side of the stator, and a ventilation port is provided in the rib of the sheave to form a ventilation path that passes through the ventilation port from the opening (second technique).
(3) A blower fan is provided between the radiating fin provided on the inner peripheral side of the stator and the rib of the sheave (third technique).

  Patent Document 2 (Japanese Patent Laid-Open No. 2008-187772) and Patent Document 3 (Japanese Utility Model Laid-Open No. 54-111101) disclose a technique for cooling by providing a blower outside an electric motor or sheave. .

JP 2005-104620 A JP 2008-187792 A Japanese Utility Model Publication No. 54-111081

However, in order to further reduce the size and weight of the motor, it is necessary to further improve the cooling performance. In the invention of Patent Document 1, there is room for improvement in the following points.
(1) The first technique is a cooling method by natural convection without attaching a cooling fan, and the cooling performance is low.
(2) In the second technique, the effective heat dissipating part that directly contacts the outside air is only the inner diameter part of the stator core, and the ratio of the heat dissipating part to the surface area of the entire motor is small. Therefore, when applied to a small and large capacity motor, there is a possibility that sufficient cooling cannot be performed.
(3) In the third technique, only a small blower fan can be attached as compared with the motor, and cooling by blowing can be expected only from the inner diameter portion of the stator core, so the effect is limited. It is.

  An object of this invention is to provide the winding machine which improved the cooling performance in view of the said prior art.

The present invention for solving the above problems
A brake stand and a motor stand arranged at predetermined intervals;
A drive having a cylindrical outer rim and a cylindrical boss concentrically disposed on the inner peripheral side of the rim, and disposed rotatably between the brake stand and the motor stand. With a sheave,
Outer rotor type electric motor having a rotor directly connected to the end surface on the motor stand side of the rim of the drive sheave and a stator disposed on the inner peripheral side of the rotor and attached to the motor stand When,
A hoisting machine equipped with
The drive sheave is
It is arranged between the inner peripheral surface of the rim and the outer peripheral surface of the boss at a predetermined position in the axial direction of the drive sheave, and between the inner peripheral surface of the rim and the outer peripheral surface of the boss. A ring-shaped plate material that extends in the radial direction so as to divide the space into a space on the brake stand side and a space on the motor stand side, and a single ring-shaped rib that connects the rim and the boss,
Ventilation holes formed at a plurality of locations in the circumferential direction at the outer peripheral portion of the ring-shaped rib;
In the space on the motor stand side, a plate material extending along the radial direction and the axial direction at a plurality of locations in the circumferential direction, a plurality of radial ribs connecting the rim and the boss,
Have
The motor stand is
From the outer periphery cover part arrange | positioned at the outer peripheral side of the said rotor, the inner peripheral cover part arrange | positioned at the inner peripheral side of the said stator, and the end surface cover part arrange | positioned among the said motors on the opposite side to the said drive sheave A motor cover part,
By supporting the inner peripheral surface of the stator by extending from a plurality of locations in the circumferential direction on the outer peripheral side surface of the inner peripheral cover portion to support the inner peripheral surface of the stator, the inner cover surface and the inner peripheral surface of the stator A plurality of stator holding members that form a ventilation path that is a space;
A suction hole formed in the end surface cover portion;
Having
It is characterized by that.

  Further, the present invention is characterized in that an inner diameter dimension of the ventilation hole is larger than an outer diameter dimension of the ventilation path.

  According to the present invention, the motor cover portion is provided with a cooling fan that blows air into the motor cover portion through the suction hole.

  According to the present invention, the electric motor is a permanent magnet type synchronous motor in which a permanent magnet is arranged on the rotor.

  According to the present invention, air cooling can be performed by rotating the drive sheave, and a good cooling effect can be obtained even when the outer rotor side electric motor is used.

The partial cross section figure which shows the winding machine which concerns on Example 1 of this invention from the front side. The left view which shows the winding machine which concerns on Example 1 of this invention. The right view which shows the winding machine which concerns on Example 1 of this invention. Sectional drawing which shows the AOA cross section of FIG. 2, FIG. Sectional drawing which shows CC cross section of FIG. Sectional drawing which shows the DD cross section of FIG. Sectional drawing which shows the EE cross section of FIG. The partial cross section figure which shows the winding machine which concerns on Example 2 of this invention from the front side. The left view which shows the winding machine which concerns on Example 2 of this invention. Sectional drawing which shows the BOB cross section of FIG.

  Hereinafter, the hoist according to the present invention will be described in detail based on examples.

[Example 1]
An elevator hoist 1 according to a first embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, a brake stand (one end side stand) 10 and a motor stand (the other end side stand) 20 are arranged on the bed 2 of the hoist 1 with a predetermined interval. Yes.
As shown in FIGS. 1 to 3, one end side (right end side in FIG. 1) of the rotating shaft 30 is supported by the brake stand 10 via a bearing 31, and the other end side (in FIG. 1). The left end side) is supported by the motor stand 20 via a bearing 32. For this reason, the rotating shaft 30 is supported so as to be rotatable about its axis.

As shown in FIGS. 1, 3, and 7, the driving sheave 40 includes a cylindrical rim 41, a cylindrical boss 42 disposed concentrically on the inner peripheral side of the rim 41, and an inner portion of the rim 41. A ring-shaped rib 43 disposed between the peripheral surface and the outer peripheral surface of the boss 42 to connect and couple the rim 41 and the boss 42 and a plurality of (in this example, eight) radial ribs 44 are configured. ing.
On the outer peripheral surface of the rim 41, a rope groove 41a for winding the main rope is formed. The rotating shaft 30 is inserted tightly and concentrically into the boss 42, and the boss 42 and the rotating shaft 30 are fixed and coupled.

As shown in FIGS. 1 and 3, the ring-shaped rib 43 is a single ring-shaped plate member that extends in the radial direction at the central portion in the axial direction of the drive sheave 40 in this example. It arrange | positions between the surface and the outer peripheral surface of the boss | hub 42, and the rim | limb 41 and the boss | hub 42 are connected. Thus, the space between the inner peripheral surface of the rim 41 and the outer peripheral surface of the boss 42 is formed by the ring-shaped ribs 43 that are orthogonal (intersect) with the axis of the drive sheave 40 (rotary shaft 30). Is divided into a right side space (one end side space) R and a left side space (other end side space) L (see FIGS. 1 and 4).
The ring-shaped rib 43 has a plurality of (in this example, eight) ventilation holes 43a formed at equal intervals along the circumferential direction (see FIG. 3). The left space L and the right space R communicate with each other through these ventilation holes 43a.

  As shown in FIGS. 1, 4, and 7, a plurality of (eight in this example) plate-like radial ribs 44 are formed in the space between the inner peripheral surface of the rim 41 and the outer peripheral surface of the boss 42. In the left space L. In other words, the radial ribs 44 are plate members that spread in the radial direction and along the axial direction at a plurality of locations in the circumferential direction. Therefore, the left space L is partitioned into a plurality of (eight in this example) small spaces L1 to L8 by being divided by a plurality of radial ribs 44 at a plurality of circumferential positions (eight in this example). (See FIG. 7).

  As shown in FIG. 1, a brake disc 15 is fixed to one end surface (right end surface) of the drive sheave 40. The brake disc 15 is a disc of a braking device (not shown) attached to the brake stand 10.

As shown in FIGS. 1 and 4, the permanent magnet type synchronous motor (hereinafter referred to as “motor”) 50 is generally disposed on the other end side (left side) of the drive sheave 40.
More specifically, the outer rotor-type rotor 51 is attached directly to the other end surface (left end surface) of the drive sheave 40. The rotor 51 is disposed concentrically with the drive sheave 40 and the rotating shaft 30. A permanent magnet 52 is attached to the inner peripheral surface of the rotor 51.
A stator 55 provided with a stator winding 57 on a stator core 56 is attached to the motor stand 20 in a state of being positioned on the inner peripheral side of the rotor 51. The stator 55 is disposed concentrically with the drive sheave 40 and the rotary shaft 30.

  Here, the detailed structure of the motor stand 20 and the details of the mounting structure for attaching the stator 55 (stator core 56) to the motor stand 20 will be described.

  As shown in FIGS. 1 and 2, the motor stand 20 includes a stand part 21 fixed to the bed 2 and a motor cover part 22 supported by the stand part 21 and covering the electric motor 50.

  As shown in FIGS. 1 and 4, the motor cover 22 includes an outer peripheral cover portion 22 a disposed on the outer peripheral side of the rotor 51 of the electric motor 50 and an inner periphery disposed on the inner peripheral side of the stator 55 (stator core 56). The peripheral cover portion 22b and the end face cover portion 22c disposed on the other end side (left end side) of the electric motor 50 are configured. In this example, the gap (diameter gap) between the outer peripheral cover portion 22a and the rotor 51 is small, but the gap (diameter between the inner peripheral cover portion 22b and the inner peripheral surface of the stator core 56 is small. The direction gap is increased.

  A plurality (six in this example) of suction holes H are formed at equal intervals along the circumferential direction in the outer peripheral portion of the end surface cover portion 22c (see FIG. 2). That is, the suction hole H is formed at a position facing the other end surface (left end surface) of the electric motor 50 (see FIGS. 1 and 4).

As shown in FIGS. 5 and 6, the outer peripheral side surface (the surface on the stator 55 side) of the inner peripheral cover portion 22b has a stator extending from the plurality of locations (six locations in this example) along the circumferential direction to the outer peripheral side. A holding member 23 is disposed. The stator holding member 23 is a plate material spreading in the radial direction and along the axial direction.
In this example, the radial length of the stator holding members 23 arranged radially in this way is approximately half the radial length from the inner peripheral cover portion 22b to the outer peripheral cover portion 22a. And the inner peripheral surface of the stator core 56 is fixed and attached to the tip (outer peripheral end surface) of each stator holding member 23. For this reason, a space can be secured between the inner peripheral surface of the stator core 56 and the outer peripheral surface of the inner peripheral cover portion 22b, and this space becomes the ventilation path V. That is, the ventilation path V is formed on the inner peripheral side of the stator core 56.

As shown in FIGS. 1, 3, and 6, the inner diameter β of the ventilation hole 43 a is larger than the outer diameter (the inner diameter of the stator core 56) α of the ventilation path V. That is, the formation position of the vent holes 43a and the radial length of the stator holding member 23 (inner diameter of the stator core 56) are set so that β> α.
As a result, when viewed in the radial direction, the ventilation path V is located on the inner peripheral side of the ventilation hole 43a. The ventilation hole V is located on the inner peripheral side with respect to the suction hole H.

The operation of the hoist 1 configured as described above will be described.
The drive sheave 40 is fixed to the rotary shaft 30 that is rotatably supported by the bearings 31 and 32, and can rotate about the shaft center together with the rotary shaft 30. That is, the drive sheave 40 is disposed between the brake stand 10 and the motor stand 20 and is rotatably supported.
When the electric motor 50 is turned on and rotated while the brake is not activated, the torque of the rotor 51 is transmitted to the driving sheave 40 and the driving sheave 40 of the hoisting machine 1 rotates. Further, when the brake is operated, the brake torque works, and the rotation of the driving sheave 40 of the hoisting machine 1 is fixed.

  When the driving sheave 40 of the hoisting machine 1 rotates, the radial ribs 44 rotate to act as a centrifugal fan, and an air flow indicated by arrows in FIG. 4 is generated.

  That is, when the driving sheave 40 rotates, the air in the small spaces L1 to L8 (see FIG. 7) is pushed to the outer peripheral side by centrifugal force. At this time, the electric motor 50 is disposed on the other end surface side (left end surface side in FIG. 1) of each of the small spaces L1 to L8 (left side space L), whereas one end surface side (right end surface side in FIG. 1). ), Since the ventilation hole 43a (see FIG. 3) is open, the air pushed into the outer peripheral side of the small spaces L1 to L8 (see FIG. 7) flows into the right space R through the ventilation hole 43a. .

As described above, air that has been pushed into the outer peripheral side of the small spaces L1 to L8 (see FIG. 7) flows into the right space R from the left space L through the ventilation holes 43a. Will occur.
That is, outside air is sucked from the suction port H, and the other end side (left end side in FIG. 1) of the stator core 56 and the stator winding 57, the ventilation path V on the inner diameter side of the stator core 56, and the stator core. 56 flows along one end side (right end side in FIG. 1) of the stator winding 57, and further flows from the left space L through the ventilation hole 43a to the right space R and exits to the outside.
Part of the air flows from the one end side to the other end side through the air gap (the space between the rotor 51 and the stator 55).

  That is, in this example, the suction hole H is formed in the outer peripheral side portion of the end surface cover portion 22c, and the inner diameter side dimension β of the ventilation hole 43a is larger than the dimension of the ventilation path V (inner diameter side dimension of the stator core 56) α. In other words, because the ventilation path V is located on the inner peripheral side of the suction hole H and the ventilation hole 43a, the air taken in from the suction hole H is along the axial direction (in FIG. 1). As it flows (from the left side to the right side), it first approaches the inner circumferential side, passes through the ventilation path V on the inner circumferential side of the stator core 56, and then spreads to the outer circumferential side, and then flows through the ventilation hole 43a. Go.

  Thus, since the mainstream air flows along the other end surface, inner peripheral surface, and one end surface of the stator 55 (stator core 56, stator winding 57), the stator 55 having a large amount of heat generation is effectively cooled. As a result, the entire electric motor 50 can be effectively cooled.

  When the hoist 1 is stopped, the air flow by the radial ribs 44 is stopped.

  In Example 1, as a result of the flow of air as described above (see FIG. 4), effective air cooling can be achieved over a wide range, and even when a small and large capacity motor is employed, the temperature rise is within the allowable limit. Can be suppressed. Furthermore, heat transfer from the stator 55 to the permanent magnet 52 is reduced, and the temperature rise of the permanent magnet 52 is suppressed, so that demagnetization of the permanent magnet 52 can be prevented.

[Example 2]
Next, a hoisting machine 1A according to a second embodiment of the present invention will be described with reference to FIGS. In this hoisting machine 1A, a cooling fan mounting seat 22d is provided in the portion of the suction hole H formed in the end surface cover portion 22c of the motor cover portion 22. A cooling fan 60 is provided on the cooling fan mounting seat 22d. The cooling fan 60 blows air into the motor cover portion 22 when driven (when electricity is supplied).

  Since the configuration of the other parts is the same as that of the hoisting machine 1 of the first embodiment, the same parts are denoted by the same reference numerals, and redundant description is omitted.

The operation of the hoisting machine 1A configured as described above is as follows.
When the hoisting machine 1A is rotating, in addition to air blown by the centrifugal fan by the radial ribs 44 as in the first embodiment, air blown by the cooling fan 60 is added to increase the blown air volume. For this reason, a cooling effect increases and the effect which suppresses a temperature rise from Example 1 becomes still higher.

  When the hoisting machine 1A is not rotating, there is no air blown by the centrifugal fan due to the radial ribs 44, but there is air blown by the cooling fan 60, and air cooling is possible even when the hoisting machine 1A is stopped. The effect of suppressing the temperature rise is higher than in Example 1.

[Modification]
In the first and second embodiments, the rotary shaft 30 is disposed so as to be rotatable with respect to the brake stand 10 and the motor stand 20, but a non-rotating support shaft is fixed to the brake stand 10 and the motor stand 20. The present invention can be applied even to a hoisting machine that rotatably supports the boss 42 of the drive sheave 40 with respect to the support shaft.

  The present invention can be applied to hoisting machines in various fields in addition to hoisting machines for elevators.

1,1A Hoisting machine 2 Bed 10 Brake stand 15 Brake disc 20 Motor stand 21 Stand part 22 Motor cover part 22a Outer cover part 22b Inner cover part 22c End face cover part 22d Cooling fan mounting seat 23 Stator holding member 30 Rotating shaft 31, 32 Bearing 40 Drive sheave 41 Rim 41a Tight groove 42 Boss 43 Ring-shaped rib 43a Ventilation hole 44 Radial rib 50 Permanent magnet synchronous motor (motor)
51 Rotor 52 Permanent Magnet 55 Stator 56 Stator Core 57 Stator Winding 60 Cooling Fan R Right Space L Left Space L1 to L8 Small Space H Suction Hole V Ventilation Path

Claims (4)

A brake stand and a motor stand arranged at predetermined intervals;
A drive having a cylindrical outer rim and a cylindrical boss concentrically disposed on the inner peripheral side of the rim, and disposed rotatably between the brake stand and the motor stand. With a sheave,
Outer rotor type electric motor having a rotor directly connected to the end surface on the motor stand side of the rim of the drive sheave and a stator disposed on the inner peripheral side of the rotor and attached to the motor stand When,
A hoisting machine equipped with
The drive sheave is
It is arranged between the inner peripheral surface of the rim and the outer peripheral surface of the boss at a predetermined position in the axial direction of the drive sheave, and between the inner peripheral surface of the rim and the outer peripheral surface of the boss. A ring-shaped plate material that extends in the radial direction so as to divide the space into a space on the brake stand side and a space on the motor stand side, and a single ring-shaped rib that connects the rim and the boss,
Ventilation holes formed at a plurality of locations in the circumferential direction at the outer peripheral portion of the ring-shaped rib;
In the space on the motor stand side, a plate material extending along the radial direction and the axial direction at a plurality of locations in the circumferential direction, a plurality of radial ribs connecting the rim and the boss,
Have
The motor stand is
From the outer periphery cover part arrange | positioned at the outer peripheral side of the said rotor, the inner peripheral cover part arrange | positioned at the inner peripheral side of the said stator, and the end surface cover part arrange | positioned among the said motors on the opposite side to the said drive sheave A motor cover part,
By supporting the inner peripheral surface of the stator by extending from a plurality of locations in the circumferential direction on the outer peripheral side surface of the inner peripheral cover portion to support the inner peripheral surface of the stator, the inner cover surface and the inner peripheral surface of the stator A plurality of stator holding members that form a ventilation path that is a space;
A suction hole formed in the end surface cover portion;
Having
A hoisting machine characterized by that. In claim 1,
The hoisting machine according to claim 1, wherein an inner diameter dimension of the ventilation hole is larger than an outer diameter dimension of the ventilation path. In claim 1 or claim 2,
The hoisting machine is characterized in that the motor cover part is provided with a cooling fan for blowing air into the motor cover part through the suction hole. In any one of Claims 1-3,
The hoisting machine is characterized in that the electric motor is a permanent magnet type synchronous electric motor in which a permanent magnet is arranged on the rotor.

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