JP4920472B2 - Electric motor with terminal box - Google Patents

Description

  The present invention relates to an electric motor, and more particularly to an electric motor with a terminal box.

Conventionally, in a motor terminal box, the cross-sectional shape of a space for accommodating a terminal is often a quadrangle. An example of such a terminal box is disclosed in Patent Document 1. The terminal box disclosed in Patent Document 1 has a quadrangular cross-sectional shape of a space for accommodating terminals, and the terminal box itself is externally attached to a side surface configured in a horizontal direction with respect to the drive shaft of the electric motor. A terminal plate for connecting the internal lead wire and the external lead wire is provided in the terminal box.
JP-A-57-25133

  In Patent Document 1, as described above, the terminal box is externally attached to the side surface configured in the horizontal direction with respect to the drive shaft of the electric motor. However, it may be preferable in design to provide a terminal box on end surfaces (front and rear surfaces of the electric motor) arranged in the axial direction of the drive shaft. When providing the terminal box on the front and rear surfaces of the electric motor, it is desirable to make the width dimension of the terminal box equal to the width dimension of the electric motor in consideration of space and aesthetics. In many cases, the electric motor has an outer shape having a cylindrical shape or a substantially cylindrical shape, and it is assumed that the terminal box is configured in a cylindrical shape or a substantially cylindrical shape along the outer shape of the electric motor. In a terminal box having such an outer shape, the cross-sectional shape of the space that accommodates the terminal is usually configured to be cylindrical or substantially cylindrical. However, when the terminal is accommodated, as disclosed in Patent Document 1, if a configuration is adopted in which the internal line and the external line are respectively arranged linearly on the terminal block (terminal plate in Patent Document 1), the terminal There is a problem in that the number of terminals that can be accommodated is reduced as compared with the case where the cross-sectional shape of the space that accommodates is square.

  Accordingly, an object of the present invention is to provide an electric motor with a terminal box that can accommodate more terminals even if the cross-sectional shape of the space for accommodating the terminals in the terminal box is a cylindrical shape or a substantially cylindrical shape. .

The present invention provides a terminal box having a terminal connection portion for connecting an internal line led out from the inside of an electric motor and an external line introduced from the outside of the electric motor on an end face arranged in the axial direction of the drive shaft of the electric motor. In the electric motor with a terminal box arranged, the terminal box uses a terminal box main body in which at least a part of the inner peripheral surface is formed in an arc shape, and the arc-shaped inner peripheral surface of the terminal box main body has a circumferential direction. A plurality of terminal connection portions are radially arranged along the inner periphery of the terminal box body, and support bases that support the terminal connection portions are radially provided along the inner peripheral surface of the terminal box body. A terminal holder having a peripheral surface portion corresponding to the shape, and provided with the support base protruding radially at regular intervals along the circumferential direction on the peripheral surface portion is accommodated in the terminal box body, and the terminal connection portion is A pair of opposed pairs assembled on the support base It is composed of parts and fitting with a protrusion protruding to the opposite section opposite direction and that connects the inner wire of the electric motor to the projecting portion of the fitting.

  The connection fitting is formed by bending a metal plate into a U shape to form a pair of opposing portions, and cutting out and raising a part of the bent portion bent into the U shape to protrude in a direction opposite to the opposing portion. Can be formed.

  An insertion hole for connecting the internal line may be formed in the protruding portion of the connection fitting, and the internal line may be inserted into the insertion hole and soldered.

  A mounting hole is formed at a position corresponding to the pair of facing portions of the connection fitting and the support base, and the external line is fastened together via a fastener that fastens the pair of facing portions and the support base. You may comprise as follows.

  The outer wall of the terminal box is formed in a cylindrical shape or substantially cylindrical shape, and the terminal box is juxtaposed on the wall surface opposite to the wall surface on which the output shaft of the electric motor is provided. It can be configured to cover the wire outlet hole.

  In the present invention, a plurality of terminal connection portions are radially arranged in the terminal box, so that even if the cross-sectional shape of the space for accommodating the terminal is cylindrical or substantially cylindrical, more A terminal can be accommodated.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows an electric motor with a terminal box according to an embodiment of the present invention. For explanation, each member is appropriately omitted. The motor 10 with a terminal box is introduced from the motor main body 11, an internal line derived from the inside of the motor main body 11 and the outside of the motor main body 11 in order to supply external power to the motor main body 11 or send a control signal. And a terminal box 12 for connecting an external line.

Motor main body 11, in a housing 13, a stator 14 and the rotor 15 are arranged concentrically, the rotor 15 via a shaft inserted through the rotary shaft line (output shaft) 16 of the rotor 15 It is assembled together. The stator 14 is disposed on the inner peripheral surface of the housing 13 and is excited by electric power supplied from the outside. The housing 13 includes a substantially cylindrical housing body 17 closed on one side and a bracket 18 closing the other opening end of the housing body 17. The bracket 18 and one wall part 17 a closed on the housing body 17. In addition, the rotary shaft 16 is rotatably supported via bearings 19 and 20. That is, the rotating shaft 16 projects from the bracket 18 to the outside of the housing 13 so that rotational power can be taken out.

  The wall 17a of the housing body 17 is formed with a through hole 21 penetrating in the thickness direction, and a detection unit 22 for detecting the temperature of the stator 14 or the number of rotations of the rotor 15 is provided. ing. A through hole 24 for leading a lead wire (internal wire) 23a for supplying power to the stator winding of the stator 14 is formed on the lower side of the wall portion 17a. A cover 25 that closes the detection portion 22 and the through hole 24 is attached to the wall portion 17 a via a screw 26.

  Furthermore, a through-hole 27 that penetrates in the thickness direction is formed in the wall surface 25 a of the cover 25, and the lead wire 23 a and the lead wire (internal wire) 23 b from the detection unit 22 pass through the through-hole 27 and the terminal box 12 is introduced. The detection unit 22 detects, for example, the rotation speed of the electric motor with a generator or the like.

  As shown in FIGS. 1 and 2, a cylindrical terminal box main body 28 provided with a flange 28a, a lid part 29 for closing the open end of the terminal box main body 28, and housed in the terminal box main body 28, It is comprised with the terminal holder 31 holding the terminal connection part 30 for connecting an external line. FIG. 2 is a view of the inside of the terminal box 12 as seen from the left in FIG. 1 with the lid 29 removed. The lid portion 29 is assembled to the flange portion 28a of the terminal box main body 28 through screws or the like (not shown). For explanation, each member is appropriately omitted.

  The outer wall of the terminal box main body 28 has a flange portion 28a protruding outward, and is configured in a substantially cylindrical shape in accordance with the motor main body portion 11 having a substantially cylindrical outer shape. The cylindrical portion is assembled to the cover 25 of the electric motor main body 11 and the terminal box main body 28 is assembled to the electric motor main body 11 via screws or the like (not shown). Since the terminal box main body 28 is installed along the outer periphery of the cover 25 so that the inner line outlet hole 27 is located inside the terminal box main body 28, the inner line outlet hole 27 is provided with the lid portion 29. And the terminal box main body 28.

  The inner peripheral surface of the terminal box body 28 is configured in a substantially cylindrical shape, and the terminal holder 31 is accommodated along the inner peripheral surface. FIG. 3 shows a perspective view of the terminal holder 31. The terminal holder 31 of the embodiment is formed in a shape with a part cut away in order to avoid a built-in component assembled in the terminal box body 28. The terminal holder 31 has an arc-shaped peripheral surface portion 32 corresponding to the inner peripheral surface shape of the terminal box main body 28, and a bottom 33 configured at one end of the arc-shaped peripheral surface portion 32. The bottom 33 includes a peripheral surface upper surface 33b and an inner lower surface 33c via a stepped portion 33a, and the upper surface 33b has a lead-out hole 34 for an internal line. The terminal holder 31 is accommodated in the terminal box body 28 so that the lead-out hole 34 of the internal line provided in the upper surface 33b corresponds to the position of the lead-out hole 27 provided in the wall surface 25a of the cover 25, It is screwed to the wall surface 25 a of the cover 25 through a screw hole 33 d provided in the bottom 33.

  The peripheral surface portion 32 is provided with a plurality of support bases 35 that project radially toward the central direction at regular intervals along the circumferential direction. A support wall 36 having a substantially trapezoidal cross-sectional shape projecting radially from the peripheral surface portion 32 is provided between the support tables 35, and the support wall 36 is provided on both side outer surfaces via the support tables 35. Supports both sides. In addition, about the support stand 35 located in both ends among the some support stand 35, the one side is supported by the side wall provided in the inner surface side of the circular-arc-shaped peripheral surface part 32. As shown in FIG. This side wall is formed by bending both end portions 32 a of the cut-out arc-shaped peripheral surface portion 32 inside the terminal holder 31. The support base 35 is provided with an attachment hole 35 a on the plate surface, and the connection fitting 30 constituting the terminal connection portion is assembled to the support base 35 through the attachment hole 35. FIG. 4 is a perspective view of the terminal holder 31 in which the connection fitting 30 is assembled. As shown in FIG. 2, the connection fitting 30 is installed at a distance of a radius r from the center O. Here, the center O is an arc-shaped center point of the terminal holder 31, and this center point is the electric motor. In the plane perpendicular to the axial direction of the main body 11, it coincides with the center point of the electric motor main body 11 configured in a substantially cylindrical shape.

  FIG. 5 shows a perspective view of the connection fitting 30. The connection fitting 30 has a pair of facing portions 30a facing each other, and a protruding portion 30b protruding in the opposite direction to the facing portion 30a. The metal plate is bent into a U shape to form a pair of facing portions 30a, and a part of the bent portion is cut and raised to form a protruding portion 30b. An attachment hole 30c for attaching the connection fitting 30 to the support base 32 is provided in the facing portion 30a, and an insertion hole 30d for connecting the internal line 23 is provided in the protruding portion 30b.

  The connection fitting 30 is assembled to the support base 35 with a screw 37 via the attachment hole 30 c and the attachment hole 35 a of the support base 35, and at this time, the external wire 40 is also fastened together with the screw 37. The external line 40 is connected to a terminal from a first external line introduction port 43 of an external line introduction unit 42 externally attached to the terminal box body 28 via a second external line introduction port 44 provided in the terminal box body 28. Guided into box 12. A crimp terminal 41 is crimped to the tip of the external wire 40 guided into the terminal box 12, and the crimp wire 41 is attached to the connection fitting 30 via the screw 37, whereby the external wire 40 is connected. It is tightened together.

  On the other hand, the internal line 23 led into the terminal holder 31 through the lead-out hole 27 and the lead-out hole 34 is fixed to the connection fitting 30 by being inserted into the insertion hole 30d and soldered. As a result, the internal line 23 and the external line 40 are connected via the connection fitting 30.

  In the above embodiment, since the plurality of terminal connection portions 30 are arranged radially along the substantially cylindrical inner peripheral surface of the terminal box 12 via the terminal holder 31, the internal line 23 and the external line 40 More terminals can be accommodated than when the connecting portion for connecting the terminals is installed in a straight line. For example, in the case of an electric motor having a flange mounting angle of 70 mm, it is possible to mount seven terminal connection portions 30 having M3.5 screws 37.

  Moreover, since the insertion hole 30d is provided in the protrusion 30b of the connection fitting 30, the internal line 23 can be easily connected by inserting the internal line 23 into the insertion hole 30d and soldering. Further, by using such a configuration, a printed circuit board that has been conventionally required is not required, and the component cost is reduced.

  Furthermore, since the terminal box 12 is installed so as to cover the lead-out hole 27 of the internal wire 23 provided in the electric motor main body 11, the internal wire 23 does not come out of the electric motor main body 11 and the terminal box 12. Excellent sealing performance.

  The present invention is not limited to the above embodiment. For example, when the detection unit 22 is not provided, the cover 25 can be omitted, and the terminal box body 28 is directly connected to the housing body. 17 can be assembled. Further, the terminal holder 31 can be formed into a complete cylindrical shape when there are no built-in components in the terminal box body 28.

It is the longitudinal cross-sectional view which notched some electric motors with a terminal box which concern on embodiment of this invention. It is an internal structure figure which removes and shows the cover part of the terminal box concerning the embodiment of the present invention. It is a perspective view of the terminal holder provided in the terminal box of FIG. It is a perspective view of the terminal holder of FIG. 3, and a terminal connection part. It is a perspective view of the connection metal fitting of the terminal connection part shown by FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Electric motor with terminal box 11 Electric motor main part 12 Terminal box 23 Internal wire 27 Lead-out hole 28 Terminal box main body 30 Terminal connection part 30a Opposing part 30b Protruding part 30c Mounting hole 30d Insertion hole 31 Terminal holder 35 Support base 35a Mounting hole 40 External line 41 Crimp terminal

Claims (5)

A terminal box having a terminal box having a terminal connection part for connecting an internal line led out from the inside of the motor and an external line introduced from the outside of the motor on an end face arranged in the axial direction of the drive shaft of the motor In the attached motor, the terminal box uses a terminal box main body in which at least a part of the inner peripheral surface is formed in an arc shape, and a plurality of arcs on the inner peripheral surface of the terminal box main body along the circumferential direction. Are arranged radially,
A support base for supporting the terminal connection portion is provided radially at regular intervals along the inner peripheral surface of the terminal box body,
A terminal holder having a peripheral surface portion corresponding to the inner peripheral surface shape of the terminal box main body and provided with the support bases radially protruding at regular intervals along the circumferential direction is accommodated in the terminal box main body. And
The terminal connection portion includes a pair of opposing portions assembled to the support base and a connection fitting having a protruding portion protruding in a direction opposite to the opposite portion, and the protruding portion of the connection fitting includes a protrusion of the electric motor. Connect internal lines
An electric motor with a terminal box. The connection fitting is formed by bending a metal plate into a U shape to form a pair of opposing portions, and cutting out and raising a part of the bent portion bent into the U shape to protrude in a direction opposite to the opposing portion. The electric motor with a terminal box according to claim 1 , wherein: 3. The terminal box attachment according to claim 1, wherein an insertion hole for connecting the internal line is formed in a protruding portion of the connection fitting, and the internal line is inserted into the insertion hole and soldered. Electric motor. A mounting hole is formed at a position corresponding to the pair of facing portions of the connection fitting and the support base, and the external line is fastened together via a fastener that fastens the pair of facing portions and the support base. The electric motor with a terminal box according to any one of claims 1 to 3 . The outer wall of the terminal box is formed in a cylindrical shape or substantially cylindrical shape, and the terminal box is juxtaposed on the wall surface opposite to the wall surface on which the output shaft of the electric motor is provided. The electric motor with a terminal box according to any one of claims 1 to 4 , wherein the lead-out hole of the wire is covered.

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