JP2014072956A - Motor and assembling method of motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate assembling work while enhancing reliability.SOLUTION: A terminal box 13 is formed on the outer peripheral surface of the cylindrical part 11 of a motor case 10. When inserting a terminal board 100 into the terminal box 13, the inner peripheral side face 101b of the terminal board 100 is supported by a drop prevention wall 13g, the insulating walls 103, 104 of the terminal board 100 are supported by a support frame 13d, and thereby the terminal board 100 is not dropped but locked temporarily. The terminal board 100 is fastened to the cylindrical part 11, a stator 10 impregnated with varnish is housed in the cylindrical part 11, and then lead wires 21U, 21V, 21W impregnated with varnish are connected with the terminal board 100.

Description

  The present invention relates to an electric motor and an electric motor assembling method, which are devised so as to be easily assembled.

In an electric motor, a stator is accommodated and fixed in a cylindrical electric motor case, and a rotor is rotatably disposed at a center position of the stator.
The stator is configured by winding a three-phase winding around a stator core formed by laminating electromagnetic steel plates. From this stator, lead wires connected to the three-phase winding are drawn out. The stator having such a configuration is accommodated and fixed in the electric motor case by shrink fitting after the varnish impregnation treatment.

A terminal block is used to connect the lead wire drawn out from the stator to an external wiring (cable) for feeding. The terminal block collects and fixes the terminals of the lead wires while securing mutual insulation, and is attached to the motor case.
In this terminal block, the terminal of the lead wire and the external wiring (cable) are connected.

Next, a conventional assembly procedure of the electric motor having such a configuration will be described (see Patent Document 1).
(1) Connect and fix the end of the lead wire pulled out from the stator to the terminal block.
(2) Mount a magnet jig equipped with a permanent magnet on the terminal block. Then, the terminal block is temporarily fixed to the outer peripheral surface of the stator by the magnetic force of the magnet jig. In this way, the terminal of the lead wire can be positioned by magnetically attaching the magnet jig mounted on the terminal block to the outer peripheral surface of the stator and temporarily fixing the terminal block to the stator.
(3) The stator on which the terminal block is temporarily fixed is impregnated with varnish. Thereby, a stator and a lead wire are also impregnated with varnish.
(4) Remove the magnet jig from the terminal block. Even if the magnet jig is removed, the lead wire is impregnated with varnish and hardened, so that the terminal block position is maintained at the temporarily fixed position.
(5) The stator is housed and fixed together with the terminal block in the motor case.
(6) Fasten the terminal block to the motor case by bolting.

JP 2008-125170 A

By the way, the above-described conventional motor has the following problems.
(A) As shown in (2) above, in order to temporarily fix the terminal block to the stator, a magnet jig is separately required, and the assembly is troublesome accordingly.
In addition, a structure for mounting the magnetic jig must be added to the terminal block so that the magnetic jig can be mounted on the terminal block, and the structure of the terminal block is complicated.
(B) As shown in (5) above, when the stator is housed and fixed in the motor case, the lead wire that has been impregnated with the varnish and hangs down due to the weight of the terminal block. There is a problem that it becomes difficult to do.
In addition, if a solid lead wire hangs down or an external force acts on the lead wire during assembly, the lead wire may be damaged at the base.
(C) As shown in (6) above, when the terminal block is fastened to the motor case, the lead wire is fixed by impregnating the varnish, so there is a possibility that the lead wire cannot be freely handled. In some cases, the terminal block may not be properly attached to the motor case.

  In view of the above prior art, the present invention can easily fix the terminal block to the motor case without requiring a special jig, and can be freely handled without fear of damaging the lead wire. And it aims at providing the assembly method of an electric motor.

The configuration of the electric motor of the present invention that solves the above problems is as follows.
In the electric motor in which the stator is accommodated in the electric motor case, and the lead wire pulled out from the stator is connected to the terminal block attached to the electric motor case,
The motor case has a cylindrical tubular portion, and a terminal box which is disposed on the outer peripheral surface of the tubular portion and has a housing space in which the terminal block is housed.
The terminal box includes a fall prevention wall that contacts an inner peripheral side surface of the terminal block, and a support frame that is disposed to face the fall prevention wall via the accommodating space.
The terminal block is disposed on a base made of an insulating material, a plurality of conductive plates that are disposed on the base and connected to terminals of the lead wires, and are disposed at positions that divide the conductive plate, and from the surface of the base Having at least one insulating wall formed upright;
When the terminal block is inserted and accommodated in the terminal box while the inner peripheral side surface of the terminal block is in contact with the fall prevention wall, the portion of the insulating wall that rises from the outer peripheral side surface of the base The height of the insulating wall is set so as to be in contact with the support frame.
Further, the inner peripheral side surface of the base is a flat surface.

The method for assembling the electric motor of the present invention includes:
Inserting and storing the terminal block in the terminal box, assembling the inserted and stored terminal block in the cylindrical portion,
Impregnating the stator and the lead wire with a liquid insulating material;
The stator that has been impregnated is accommodated in the cylindrical portion of the motor case,
Connecting the lead wire that has been impregnated to the terminal block;
It is characterized by that.

According to the present invention, when the terminal block is inserted and accommodated in the terminal box, the terminal block is temporarily fixed by being supported by the fall prevention wall and the support frame, so that the terminal block can be easily attached to the motor case. it can.
In addition, after attaching the terminal block to the motor case, the stator is impregnated with liquid insulating material, and the impregnated stator is housed in the motor case, so there is no risk of damage to the lead wires and reliability is improved. improves.

The front view which shows the electric motor of the state provided with the terminal block. The front view which shows the electric motor of the state which is not provided with the terminal block. The top view which shows the electric motor of the state which removed one end surface board (bracket). The top view which shows the electric motor case of the state which removed one end surface board (bracket). The partial perspective view which shows the principal part of an electric motor in the state which removed one end surface board (bracket). The perspective view which shows a terminal block. The front view which shows a terminal block. The top view which shows a terminal block. The left view which shows a terminal block.

  Hereinafter, an electric motor and a method for assembling the electric motor according to the present invention will be described in detail based on examples.

First, a three-phase motor 1 according to an embodiment of the present invention will be described.
1 is a front view showing the electric motor 1 with the terminal block 100, FIG. 2 is a front view showing the electric motor 1 without the terminal block 100, and FIG. 3 shows one end plate (bracket). 4 is a top view showing the motor 1 with the end plate removed, FIG. 4 is a top view showing the motor case 10 with one end plate (bracket) removed, and FIG. 5 shows the one end plate (bracket) removed. It is a partial perspective view which shows the principal part of the electric motor 1 in the state made.

  In the following description of the embodiment, the upper surface (one surface) of FIGS. 1 and 2 in the state where the rotation center axis of the electric motor 1 is directed in the vertical direction as shown in FIGS. The position is referred to as “upper surface” or “upper surface side”, and the lower surface (the other surface) or position is referred to as “lower surface” or “lower surface side”.

  As shown in FIG. 4, the electric motor case 10 of the electric motor 1 includes a cylindrical tubular portion 11, an end face plate 12 formed on the lower surface side of the tubular portion 11, and an end surface on the upper surface side of the tubular portion 11. An end face plate (not shown) for closing and a terminal box 13 are provided. The cylindrical portion 11, the end face plate 12, and the terminal box 13 are integrally formed of aluminum alloy or the like. An end plate (not shown) on the upper surface side is fastened to the tubular portion 11 and the terminal box 13 by bolting or the like in a state of closing the upper surface of the tubular portion 11 and the upper surface of the terminal box 13.

  A hole 12 a is formed in the center portion of the end face plate 12. Although not shown, a hole is also formed in the center of the upper end face plate.

  As shown in FIGS. 2 and 4, the terminal box 13 is disposed on the outer peripheral surface of the cylindrical portion 11 with the position of the upper surface thereof matching the position of the upper surface of the cylindrical portion 11.

Inside the terminal box 13, an accommodation space 13 a for accommodating a terminal block 100 described later is formed.
An insertion hole 13 b having an opening area through which the terminal block 100 can be inserted is formed on the upper surface of the terminal box 13.
An attachment work hole 13c is formed on the outer peripheral side surface of the terminal box 13 (the surface facing away from the outer peripheral surface of the cylindrical portion 11 away from the outer periphery along the radial direction when viewed from the outer peripheral surface of the cylindrical portion 11).
A portion of the terminal box 13 between the insertion hole 13b and the mounting work hole 13c and extending in a direction perpendicular to the direction along the rotation center axis of the electric motor 1 (left and right in FIGS. 2 and 4), that is, mounting A frame portion on the upper side of the work hole 13c serves as a support frame 13d.
A cable lead-out hole 13e is formed on a side surface of the terminal box 13 (a surface rising radially outward from the peripheral surface of the cylindrical portion 11).

A support surface 13f that supports the terminal block 100 housed in the terminal box 13 is formed on the lower surface of the housing space 13a.
A fall prevention wall 13g is formed on the inner peripheral side surface of the terminal box 13 (the surface facing the outer peripheral surface of the cylindrical portion 11 in the vicinity of the outer peripheral surface of the cylindrical portion 11). The fall prevention wall 13g is a flat wall and is parallel to the rotation center axis of the electric motor 1.
For this reason, the support frame 13d is disposed at a position facing the fall prevention wall 13g through the accommodation space 13a. In addition, the distance between the fall prevention wall 13g and the support frame 13d is the thickness of the terminal block 100 described later (the inner peripheral side surface 101b, the insulating wall 103, and the like) so that the terminal block 100 can be inserted and accommodated in the accommodating space 13a. 104, the length corresponding to the tip portion of the surface rising from the outer peripheral side surface 101f.
Four columnar mounting portions 14 are formed on the fall prevention wall 13g.

As shown in FIG. 3, a stator 20 is accommodated and fixed in the motor case 10. A rotor 30 is rotatably arranged and attached to the center position of the stator 20.
The stator 20 is configured by winding a three-phase winding around a stator core formed by laminating electromagnetic steel plates. From this stator 20, lead wires 21U, 21V, and 21W connected to the three-phase winding are drawn out. The stator 20 is housed and fixed in the electric motor case 10 by shrink fitting after being subjected to varnish impregnation treatment (impregnation treatment of a liquid insulating material).

  As shown in FIGS. 1, 3, and 5, a terminal block 100 is accommodated and attached in the terminal box 13. The terminals of the lead wires 21U, 21V, and 21W drawn out from the stator 20 are attached to the terminal block 100.

The configuration of the terminal block 100 will be described with reference to FIG. 6 which is a perspective view, FIG. 7 which is a front view, FIG. 8 which is a top view and FIG. 9 which is a left side view.
In the state shown in FIG. 7, the upper surface is referred to as an “upper surface”, the front surface is referred to as an “outer peripheral side surface”, and the rear surface is referred to as an “inner peripheral side surface”.

The base portion 101 of the terminal block 100 is made of resin. The outer peripheral side surface 101f of the base portion 101 has a two-step shape with the central portion raised in the left-right direction in FIG. 7, and the inner peripheral side surface 101b has a flat surface. Resin insulating walls 103 and 104 are integrally formed.
That is, the resin-made (insulating material) base 101 and the resin (insulating material) insulating walls 103 and 104 are formed simultaneously and integrally by resin molding.

  Three copper bars (conductive plates) 102a, 102b, and 102c are attached to the base portion 101 with an interval therebetween.

The copper bar 102a is disposed on the upper surface 101u of the base portion 101, and is disposed in a shape extending from the upper surface 101u to the outer peripheral side surface 101f and bent at a right angle at the outer peripheral side surface 101f.
A portion of the copper bar 102a disposed on the upper surface 101u is the fastening portion Tu, and a portion of the copper bar 102a disposed on the outer peripheral side surface 101f is the fastening portion Tx.

The copper bar 102b is disposed on the upper surface 101u of the base portion 101, extends from the upper surface 101u to the outer peripheral side surface 101f, and is further bent in a right angle direction at the outer peripheral side surface 101f.
A portion of the copper bar 102b disposed on the upper surface 101u is the fastening portion Tv, and a portion of the copper bar 102b disposed on the outer peripheral side surface 101f is the fastening portion Ty.

The copper bar 102c is disposed on the upper surface 101u of the base portion 101, extends from the upper surface 101u to the outer peripheral side surface 101f, and is bent in a right angle direction at the outer peripheral side surface 101f.
A portion of the copper bar 102c disposed on the upper surface 101u is a fastening portion Tw, and a portion of the copper bar 102c disposed on the outer peripheral side surface 101f is a fastening portion Tz.

  Lead wires 21U, 21V, 21W are connected to the fastening portions Tu, Tv, Tw, and three-phase (three) cables (feed wires) 41, 42, 43 are connected to the fastening portions Tx, Ty, Tz. .

  The insulating wall 103 is disposed at a position separating the copper bar 102a and the copper bar 102b. The insulating wall 103 is bent along the bent state of the copper bars 102a and 102b, and a surface rising vertically from the upper surface 101u of the base portion 101 and a surface rising vertically from the outer peripheral side surface 101f are continuously formed. Yes.

  The insulating wall 104 is disposed at a position that separates the copper bar 102b and the copper bar 102c. The insulating wall 104 is bent along the bent state of the copper bars 102b and 102c, and a surface rising vertically from the upper surface 101u of the base portion 101 and a surface rising vertically from the outer peripheral side surface 101f are continuously formed. Yes.

  Of the insulating walls 103 and 104, the height of the surface rising vertically from the outer peripheral side surface 101f is the outer peripheral side surface of the insulating walls 103 and 104 when the inner peripheral side surface 101b of the terminal block 100 is in contact with the fall prevention wall 13b. It is set so that the side of the tip portion of the surface rising vertically from 101f is in contact with the support frame 13d.

  Attachment portions 105 are formed on the left and right sides of the base portion 101 of the terminal block 100.

Here, the assembly procedure of the electric motor 1 will be described.
First, the terminal block 100 is inserted from the insertion port 13 b of the terminal box 13 and inserted into the accommodation space 13 a of the terminal box 13. Inserting in this way, the terminal block 100 is accommodated in the accommodating space 13a by the tip (lower end) of the terminal block 100 coming into contact with the support surface 13f.

When the terminal block 100 is inserted into the housing space 13a of the terminal box 13, the inner peripheral side surface 101b of the terminal block 100 is in sliding contact with the fall prevention wall 13g of the terminal box 13, and the insulating walls 103 and 104 are separated from the outer peripheral side surface 101f. The edge at the tip of the raised surface is in sliding contact with the support frame 13d of the terminal box 13.
For this reason, when the terminal block 100 is inserted into the accommodating space 13a of the terminal box 13, the terminal block 100 falls to the inside of the cylindrical portion 11, or the outside of the cylindrical portion 11 (the outside of the terminal box 13). ).

When the terminal block 100 is accommodated in the accommodating space 13a of the terminal box 13, the inner peripheral side surface 101b of the terminal block 100 abuts against the fall prevention wall 13g of the terminal box 13, and rises from the outer peripheral side surface 101f of the insulating walls 103 and 104. The side of the tip of the surface comes into contact with the support frame 13d of the terminal box 13.
For this reason, when the terminal block 100 is accommodated in the accommodating space 13a of the terminal box 13, the terminal block 100 falls to the inner side of the cylindrical part 11, or the outer side of the cylindrical part 11 (outside of the terminal box 13). It will never fall.
That is, the terminal block 100 can be temporarily fixed in the terminal box 13 simply by inserting and storing the terminal block 100 in the receiving space 13 of the terminal box 13.

  When the terminal block 100 is temporarily fixed in the terminal box 13 in this way, a bolt is inserted into the mounting portion 105 of the terminal block 100 from the mounting work hole 13c and screwed into the mounting portion 14 formed on the fall prevention wall 13g. By performing this fastening operation, the terminal block 100 is assembled (fastened) to the electric motor case 10 (tubular portion 11).

  On the other hand, the length and position of the lead wires 21U, 21V, and 21W are adjusted so that the lead wires 21U, 21V, and 21W can be optimally connected to the terminal block 100 in a later process. Thus, the stator 20 in which the adjustment of the lengths and positions of the lead wires 21U, 21V, and 21W is completed is varnish-impregnated.

  The stator 20 that has been subjected to the varnish impregnation treatment is accommodated and fixed in the electric motor case 10.

  The lead wires 21U, 21V, 21W are connected to the fastening portions Tu, Tv, Tw of the terminal block 100. Although the lead wires 21U, 21V, and 21W have been impregnated and solidified, the length and position have already been adjusted, so that the lead wires can be adjusted to the extent that the positions of the lead wires 21U, 21V, and 21W are finely adjusted. 21U, 21V, and 21W can be easily connected to the fastening portions Tu, Tv, and Tw of the terminal block 100.

A rotor 30 is rotatably arranged and attached to the center position of the stator 20.
Three-phase (three) cables (feed lines) 41, 42, 43 are connected to the fastening portions Tx, Ty, Tz of the terminal block 100.

In this embodiment, when the terminal block 100 is inserted into the housing space 13a of the terminal box 13 and when the terminal block 100 is housed in the housing space 13a of the terminal box 13, the inner peripheral side surface 101b of the terminal block 100 falls. It is supported by the prevention wall 13g, and the insulating walls 103 and 104 of the terminal block 100 are supported by the support frame 13d. For this reason, the terminal block 100 can be temporarily fixed only by inserting and accommodating the terminal block 100 in the terminal box 13.
Therefore, a special jig is not necessary, and assembly work is facilitated. Further, the structure of the terminal block 100 is simplified.

  The terminal block 100 is assembled to the motor case 10 in advance, and the stator 20 (lead wires 21U, 21V, 21W) to which the terminal block 100 is not connected is varnish-impregnated, and the varnish-impregnated stator 20 is processed into the electric motor. It is housed and fixed in the case 10. For this reason, the lead wires 21U, 21V, and 21W can be properly connected to the terminal block 100 only by adjusting the lengths and positions of the lead wires 21U, 21V, and 21W and making fine adjustments during connection. As well as improving, it becomes easy to automate the assembly work.

When the stator 20 is impregnated with a liquid insulating material (varnish), or when the stator 20 is accommodated and fixed in the motor case 10, the lead wires 21U, 21V, and 21W are not connected to the terminal block 100.
For this reason, when the stator 20 is impregnated with a liquid insulating material (varnish) or when the stator 20 is accommodated / fixed in the motor case 10, the load of the terminal block 100 acts on the lead wires 21U, 21V, 21W. There is no possibility that the lead wires 21U, 21V, and 21W are damaged, and the reliability is improved.

In the above embodiment, the two insulating walls 103 and 104 are provided, but any one insulating wall may be provided.
Moreover, although the above example is intended for a three-phase electric motor, it goes without saying that the present invention can be applied to an electric motor other than the three-phase electric motor.

DESCRIPTION OF SYMBOLS 1 Electric motor 10 Motor 11 Cylindrical part 12 End surface plate 12a Hole 13 Terminal box 13a Housing space 13b Insertion hole 13c Mounting work hole 13d Support frame 13e Cable extraction hole 13f Support surface 13g Fall prevention wall 14 Mounting part 20 Stator 21U, 21V, 21W Lead wire 30 Rotor 41, 42, 43 Cable 100 Terminal block 101 Base portion 101u Upper surface 101f Outer peripheral side surface 101b Inner peripheral side surface 102a, 102b, 102c Copper bar (conductive plate)
103, 104 Insulating wall 105 Mounting portion Tu, Tv, Tw, Tx, Ty, Tz Fastening portion

Claims (3)

In the electric motor in which the stator is accommodated in the electric motor case, and the lead wire pulled out from the stator is connected to the terminal block attached to the electric motor case,
The motor case has a cylindrical tubular portion, and a terminal box which is disposed on the outer peripheral surface of the tubular portion and has a housing space in which the terminal block is housed.
The terminal box includes a fall prevention wall that contacts an inner peripheral side surface of the terminal block, and a support frame that is disposed to face the fall prevention wall via the accommodating space.
The terminal block is disposed on a base made of an insulating material, a plurality of conductive plates that are disposed on the base and connected to terminals of the lead wires, and are disposed at positions that divide the conductive plate, and from the surface of the base Having at least one insulating wall formed upright;
When the terminal block is inserted and accommodated in the terminal box while the inner peripheral side surface of the terminal block is in contact with the fall prevention wall, the portion of the insulating wall that rises from the outer peripheral side surface of the base The electric motor characterized in that a height of the insulating wall is set so as to be in contact with the support frame. In claim 1,
An electric motor characterized in that an inner peripheral side surface of the base is flat. An electric motor assembling method for assembling the electric motor according to claim 1 or 2,
Inserting and storing the terminal block in the terminal box, assembling the inserted and stored terminal block in the cylindrical portion,
Impregnating the stator and the lead wire with a liquid insulating material;
The stator that has been impregnated is accommodated in the cylindrical portion of the motor case,
Connecting the lead wire that has been impregnated to the terminal block;
A method for assembling an electric motor.

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