JP2008079400A - Air-cooled motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air-cooled motor which enhances the coolability and also secures the sealability within a terminal box. <P>SOLUTION: In an air-cooled motor, a groove for fitting in a packing (16) is provided on the opposite face side of a terminal box 14 from an antiload-side bracket 4, and also the antiload-side bracket 4 and the terminal box 14 are in contact. A groove 14a for fitting in a backing B(17) is provided on the opposite face side of the terminal box 14 from a terminal box cover 15, and also the terminal box 14 and the terminal box cover 15 are in contact. The terminal box 14 and the terminal box cover 15 are provided with a fin A(18) and a fin B(19) for heat radiation, respectively. Hereby, the sealability can be secured by fitting in the packings 16(a) and 17(b) of the motor in the grooves 14a and 14b provided each at the contact face. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an improvement in cooling capacity of an air-cooled electric motor used, for example, for driving a spindle for a machine tool.

Conventionally, electronic parts such as a motor control board have been mounted on a motor terminal box in order to save space, reduce the number of wiring steps, and increase the functionality. For example, the present invention is applied to an air-cooled electric motor used for driving a spindle for a machine tool (see, for example, Patent Document 1).
FIG. 2 is a side sectional view of a conventional air-cooled electric motor.
In FIG. 2, 1 is a rotor, 2 is a stator, 3 is a load side bracket fixed to an axial opening on the load side of the stator 2, and 4 is an axial opening on the opposite side of the stator 2. A fixed anti-load side bracket 5 is a load side bearing for supporting the rotor 1 so as to be rotatable in the axial direction with respect to the stator 2 via the load side bracket 3, and 6 is an anti load side bracket with respect to the stator 2. 4 is a counter-load side bearing that rotatably supports the rotor 1 with respect to the axial direction via 4, 7 is a detector that detects the rotation of the rotor 1, 8 is a detector cover that covers the detector, 9 is a fan casing fixed on the non-load side of the motor body, 11 is a cooling fan fixed to the fan casing 10, and 12 covers the cooling fan 11 and is fixed to the fan casing 10. Finger guard, 13 is front 10 to 12 fan units, 14 is a terminal box fixed to the motor body 9, 15 is a terminal box cover fixed to the terminal box 14, and 20 is sandwiched between the motor body 9 and the terminal box 14. The packings C and 21 represent the packing D sandwiched between the terminal box 14 and the terminal box cover 15.
As described above, the conventional air-cooled electric motor secures the sealing performance by sandwiching the packing between the anti-load side bracket 4 of the main body and the terminal box 14 and between the terminal box 14 and the terminal box cover 15.
Japanese Patent Laid-Open No. 7-245913

Conventional air-cooled motors have packings sandwiched between the non-load side bracket of the motor body and the terminal box, and between the terminal box and the terminal box cover, and these packings cut off the heat generated from the motor body. Therefore, such a structure has been one of the obstacles in improving the cooling capacity of the air-cooled electric motor.
The present invention has been made in view of such problems, and an object of the present invention is to provide an air-cooled electric motor that ensures sealing performance and has improved cooling capacity.

In order to solve the above problems, the present invention is configured as follows.
According to a first aspect of the present invention, there is provided a stator in which an armature winding is wound around a core made of a laminated iron core, and a bracket attached to axial openings on the load side and the anti-load side of the stator. And a rotor rotatably supported by the bracket via a bearing, and a lead for supplying power to the armature winding, and an external power source connected to the outer periphery of the anti-load side bracket In the air-cooled electric motor including the terminal box, the anti-load side bracket and the terminal box are configured to contact each other without a heat insulating material, and the terminal box is formed from the main body of the electric motor. It is also used as a cooling member for the electric motor so that the generated heat can be transmitted to the terminal box.
The invention according to claim 2 is the air-cooled electric motor according to claim 1, wherein the terminal box and the terminal box cover for covering the terminal box are brought into contact without a heat insulating material, and The terminal box cover is also used as a cooling member for the electric motor.
According to a third aspect of the present invention, in the air-cooled electric motor according to the first aspect, a groove portion for fitting a packing is provided on the surface of the terminal box facing the anti-load side bracket, and the anti-load The side bracket and the terminal box are brought into contact with each other.
According to a fourth aspect of the present invention, in the air-cooled electric motor according to the second aspect, a groove portion for fitting a packing is provided on a surface of the terminal box facing the terminal box cover, and the terminal box and The terminal box covers are brought into contact with each other.
According to a fifth aspect of the present invention, in the air-cooled electric motor according to the second aspect, a fin for heat dissipation is provided on the surface of the terminal box or the surface of the terminal box cover.

According to the first aspect of the present invention, the heat generated from the motor body can be transferred to the terminal box without passing through the heat insulating material, and the heat of the motor body is radiated from the surface of the terminal box to the atmosphere. Can be cooled.
According to the second aspect of the present invention, the heat transmitted from the electric motor body to the terminal box can be transmitted to the terminal box cover, and the heat of the electric motor body is radiated from the surface of the terminal box cover to the atmosphere for cooling. can do.
In addition, according to the third aspect of the present invention, heat generated from the electric motor body can be efficiently transmitted to the terminal box, and the sealing performance inside the terminal box can be secured.
In addition, according to the fourth aspect of the present invention, the heat transmitted from the motor body to the terminal box can be efficiently transferred to the terminal box cover, and the sealing performance inside the terminal box can be secured.
According to the fifth aspect of the present invention, the heat transferred from the motor body to the terminal box or the terminal box cover can be efficiently radiated to the outside air by providing the fins on the terminal box or the end box cover.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a side sectional view of an air-cooled electric motor according to a first embodiment of the present invention. In FIG. 1, A part is a groove part in which packing A is fitted, and B part is an enlarged groove part in which packing B is fitted. The figure is shown. In addition, the description is abbreviate | omitted about the same component of this invention as a prior art, and a different point is demonstrated.
In FIG. 1, 14 a is a groove portion, 14 b is a groove portion, 16 is a packing A, 17 is a packing B, 18 is a fin A, and 19 is a fin B.
It is.
The features of the present invention are as follows.
That is, the anti-load side bracket 4 and the terminal box 14 are configured to contact each other without a heat insulating material, and the terminal box 14 transmits heat generated from the main body 9 of the electric motor to the terminal box 14. So that it can also be used as a cooling member of the electric motor, and between the terminal box 14 and the terminal box cover 15 for covering the terminal box 14 without being in contact with a heat insulating material, The terminal box cover 15 is also used as a cooling member for the electric motor.
Specifically, a groove for fitting the packing A (16) is provided on the side of the terminal box 14 facing the anti-load side bracket 4, and the anti-load side bracket 4 and the terminal box 14 are brought into contact with each other. In addition, a groove for fitting the packing B (17) is provided on the side of the terminal box 14 facing the terminal box cover 15, and the terminal box 14 and the terminal box cover 15 are in contact with each other. It is.
Further, the terminal box 14 and the end box cover 15 are provided with heat radiation fins A (18) and fins B (19), respectively.

Next, the operation will be described.
When the cooling fan 11 is rotated under the above configuration, the cooling air sucked into the fan casing 10 is sent to the anti-load side bracket side, and a rotor rotation detector provided on the anti-load side bracket, etc. Cool down. On the other hand, the heat generated in the core and armature winding constituting the stator 2 of the electric motor body 9 is in contact with the terminal box 14 because the anti-load side bracket 4 of the electric motor body 9 and the terminal box 14 are in direct contact. It is transmitted efficiently. The heat transmitted to the terminal box 14 is efficiently transmitted to the terminal box cover 15 because the terminal box 14 and the terminal box cover 15 are in direct contact. The heat transmitted to the terminal box 14 is radiated to the atmosphere from the surface of the terminal box 14 and the fins A (18). The heat transmitted to the terminal box cover 15 is dissipated into the atmosphere from the surface of the terminal box cover 15 and the fins B (19). The sealing property inside the terminal box 14 is ensured by the packing A16 and the packing B17.

  As described above, the air-cooled electric motor according to the present invention can positively use the terminal box and the terminal box cover to dissipate heat generated from the motor body, and can improve the heat-dissipating efficiency of the air-cooled electric motor compared to the prior art. it can.

BRIEF DESCRIPTION OF THE DRAWINGS It is a sectional side view of the air-cooled electric motor which shows 1st Example of this invention, The A part in a figure expanded the groove part which fitted packing A, and B part expanded the groove part which fitted packing B. Side view of a conventional air-cooled motor

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotor 2 Stator 3 Load side bracket 4 Anti load side bracket 5 Load side bearing 6 Anti load side bearing 7 Detector 8 Detector cover 9 Electric motor main body 10 Fan casing 11 Cooling fan 12 Finger guard 13 Fan unit 14 Terminal box 14a Groove 14b Groove 15 Terminal box cover 16 Packing A
17 Packing B
18 Fin A
19 Fin B
20 Packing C
21 Packing D

Claims (5)

A stator formed by winding an armature winding around a core made of a laminated iron core;
A bracket attached to an axial opening on the load side and the anti-load side of the stator;
A rotor rotatably supported on the bracket via a bearing;
A terminal box that is provided on the outer peripheral portion of the anti-load side bracket and connects a lead for supplying power to the armature winding to an external power source;
In the air-cooled electric motor with
Between the anti-load side bracket and the terminal box, it is configured to contact without interposing a heat insulating material,
An air-cooled electric motor characterized in that the terminal box is also used as a cooling member of the electric motor so that heat generated from the main body of the electric motor can be transmitted to the terminal box.   2. The terminal box cover for covering the terminal box and the terminal box cover is made to contact without a heat insulating material, and the terminal box cover is also used as a cooling member for the electric motor. The air-cooled electric motor described.   2. A groove portion for fitting packing is provided on a surface of the terminal box facing the anti-load side bracket, and the anti-load side bracket and the terminal box are brought into contact with each other. Air-cooled electric motor.   3. The terminal box and the terminal box cover are provided with grooves for fitting packing on a surface facing the terminal box cover of the terminal box, and the terminal box and the terminal box cover are respectively brought into contact with each other. Air-cooled electric motor.   The air-cooled electric motor according to claim 2, wherein a fin for heat radiation is provided on a surface of the terminal box or a surface of the terminal box cover.

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