JP3792093B2 - Motor terminal block - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of a winding processing terminal block of an electric motor.
[0002]
[Prior art]
For example, a winding terminal block (hereinafter referred to as a terminal block) of a conventional electric motor used for driving a fan such as a ventilation fan will be described with reference to FIGS. 8R> 8 and FIG. 9 described in Japanese Patent Laid-Open No. 9-322458. To do. 8 and 9, the terminal block 4 mounted on the inner peripheral side of the inner winding 2 and the outer winding 3 inserted into the stator core 1 has an annular shape having a plurality of terminal insertion holes 10 for arranging the terminals. A plurality of fixed legs 8 that contact the stator core 1, the disk portion 5, a substantially trapezoidal element mounting portion 6 that mounts an overtemperature preventing element, and a binding portion 7 that fixes the lead wire. 9 is integrally molded with insulating resin, the element mounting portion 6 has a rising portion 11a from the disc portion 5, extends in a bowl shape in the outer peripheral direction of the disc portion 5, and the binding portion 7 is also a disc. It has a rising portion 11 b from the portion 5, extends in a bowl shape in the outer peripheral direction of the disk portion 5, and the fixed legs 8 and 9 extend below the disk portion 5.
[0003]
In the above configuration, when the terminal block 4 is mounted so as to be pushed down to the inner peripheral side of the inner winding 2 as shown in FIGS. 8 and 9, the fixed legs 8 and 9 of the terminal block 4 abut against the stator core 1. The position is maintained, the rising portion 11a of the device mounting portion 6 contacts the coil end, the rising portion 11b of the bundling portion 7 contacts the coil end, and the terminal block 4 escapes the coil end by the rising portions 11a and 11b. It is located on the upper surface of the inner winding 2 and the outer winding 3. As a result, it is possible to provide a terminal block 4 that can be shared by giving many functions to one component and that can be easily assembled.
[0004]
[Problems to be solved by the invention]
However, the terminal block 4 of the electric motor configured as described above has a sufficient insulation distance between the inner surface of the electric motor housing and the overheat prevention element and the like because the element mounting portion 6 and the binding portion 7 are not insulated. Have to do. Therefore, there has been a problem that the dimension in the axial direction of the electric motor becomes long in order to ensure the insulation distance.
[0005]
The present invention has been made to solve the above-described problems. It is an object of the present invention to obtain a terminal block having a plurality of functions and to provide a terminal block for an electric motor having a short axial dimension.
[0006]
[Means for Solving the Problems]
The terminal block of the electric motor according to the present invention is inserted on the stator core and fixed on the end of the wound winding, and detects a temperature of the winding and interrupts the circuit, The lead wire of the winding is connected and covered so as to cover the terminal portion connected to the external wire.
[0007]
A conductive first terminal fixed to the end of the wound coil that is inserted and wound in the stator core, connected to the lead wire of the coil and connected to an external line; A current interrupting element that detects the temperature of the wire and interrupts the circuit, a component fixing part that accommodates a second terminal that fixes the lead wire of the current interrupting element, and a cover part that covers the component fixing part It is.
[0008]
A winding fixing base that is inserted into the stator core and fixed on the end of the wound winding, and fixed on the winding fixing base and connected to the lead wire of the winding. In addition, a conductive first terminal connected to an external line, a current interrupting element that detects the temperature of the winding and interrupts the circuit, and a component fixing that accommodates a second terminal that fixes the lead wire of the current interrupting element And a cover portion that closes the component fixing portion.
[0009]
Further, the component fixing portion is provided with a plurality of protrusions, and the cover portion is provided with a plurality of holes for engaging with the plurality of protrusions.
[0010]
The cover portion engages with the periphery of the component fixing portion and covers the component fixing portion.
[0011]
The cover part is made of a non-flexible member.
[0012]
The cover part is divided into a plurality of parts.
[0013]
Further, the winding fixing base has a protruding piece that is engaged with the teeth of the inner diameter portion of the stator core.
[0014]
Further, a part on the U-shaped section is formed in the main body housing, and the part is searched for in this part.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
Embodiment 1 FIG.
1 is a longitudinal sectional view showing an electric motor according to Embodiment 1 of the present invention, FIG. 2 is a longitudinal sectional view of an iron core, windings and a terminal block in the electric motor of FIG. 1, and FIG. 3 is a terminal block in the electric motor of FIG. 4 is a front view (a) of the winding fixing base of the terminal block in the electric motor of FIG. 1, a side view (b), and FIG. 5 is a front view of the component fixing base of the terminal block in the electric motor of FIG. It is (a) and a side view (b).
[0016]
1 to 5, an electric motor 100 includes a rotor 102 having a shaft 102h at the center, and a stator core 104 having a hole 104e through which the rotor 102 passes, and a plurality of thin electromagnetic steel plates laminated. The winding 106 is inserted into the slot 104s of the stator core 104 and wound with a large number of wires, and the hole is fixed on the end of the winding 106 and penetrates the shaft 102h. An annular terminal block 200 having 200r, and two substantially cylindrical housings 110 and 112 for accommodating the terminal block 200, the rotor 102, the stator core 104, and the like are formed.
[0017]
The terminal block 200 is fixed on the upper end portion of the winding 106, and has an annular and disk-shaped winding fixing base 202 having a hole 202r through the shaft 102h at the center, and the winding fixing base 202. An annular and disk-shaped component fixing base 206 having a hole 206r that passes through the shaft 102h at the center and a recess 206u of the component fixing base 206 and a hole 250r that passes through the shaft 102h at the center are provided. An annular disk-shaped terminal cover 250 is formed.
[0018]
The winding fixing base 202 operates at a temperature of the winding 106 at a predetermined value or more to interrupt the circuit, and fixes the body of the current interrupting element 220 that returns (closes) when the temperature decreases to the predetermined temperature. Teeth (not shown) between two fixing portions 202n, six recessed terminal storage portions 202t for storing terminals 206t (described later) slightly protruding from the back of the component fixing base 206, and slots 104s of the stator core 104. And notches 202e engaged with each other, and four projecting pieces 202h provided vertically downward at intervals of 90 °.
[0019]
The component fixing base 206 includes a first terminal 206t that engages and fixes a conductive terminal 210 that is electrically connected to an external line (not shown) of the lead wire 106L (see FIG. 1) of the winding 106; A long hole 206n for fixing the body of the current interrupting element 220 to the fixing part 202n of the winding fixing base 202, a second terminal 212 for fixing the lead wire of the current interrupting element 220, the first and second A recess 206u for accommodating the terminals 206t and 212 and the current interrupting element 220, a groove-like wiring portion 206d for wiring an external line, a lead-out portion 206z for the external line, and a plurality of protrusions 206h provided in the vertical direction. Have.
[0020]
The terminal cover 250 is made of a non-flexible polyester film that is electrically insulative, and the terminal cover 250 is provided with a plurality of holes 250e that are formed to be engaged with the protrusions 206h of the component fixing base 206. ing. Here, the reason why the terminal cover 250 is made inflexible is that when bent, the hole 250e of the terminal cover 250 is difficult to be inserted into the protrusion 206h of the component fixing base 206.
[0021]
As shown in FIG. 1, recesses 110a and 112a are formed at both ends of the housings 110 and 112, and outer rings of bearings 116 and 118 are fitted and fixed to the recesses 110a and 112a, respectively. The inner ring 118 is fitted and fixed to the shaft 102 h of the rotor 102, and the inner wall of the housing 110 is formed with a corner 110 u into which the terminal block 200 is loosely inserted.
[0022]
A method of manufacturing an electric motor having the terminal block 200 configured as described above will be described with reference to FIGS. A large number of thin iron cores are stacked to form a fixed iron core 104, a number of electric wires are wound around slots 104s of the fixed iron core 104 to form a winding 106, and outer rings of bearings 116 and 118 are fixed to housings 110 and 112. The rotating shaft 102h of the rotor 102 is fitted and fixed to the inner rings 116 and 118, and the winding fixing base 202 is placed on the winding 106 and wound and fixed with a thread, and the notch 202e of the protruding piece 202h is fixed. The fixed iron core 104 is engaged and fixed to the teeth between the slots 104s.
[0023]
By electrically connecting the external wire from the lead-out portion 206z of the component fixing base 206 to the first terminal 206t through the wiring portion 206d, and electrically connecting the lead wire of the current interrupting element 220 to the second terminal 212. The body part of the current interruption element 220 is positioned on the long hole 206n. The first terminal 206t of the component fixing base 206 is engaged and fixed to the terminal accommodating part 202t of the winding fixing part 202, and the body part of the current interrupting element 220 is placed on the fixing part 202n of the winding fixing base 202 with an adhesive. Fix it.
[0024]
The hole 250e of the terminal cover 250 is engaged with the protrusion 206h of the component fixing base 206, the protrusion 206h is welded, the terminal block 200 is loosely inserted into the center portion 110u of the housing 110, and the housings 110 and 112 are covered with the terminal block 200. Is completed.
[0025]
As shown in FIG. 6, the terminal cover 260 is engaged with the corner 110u of the housing 110 so as to have an outer flange 260a and an inner flange 260c so as to cover the periphery of the winding fixing base 202. Also good. Further, the flange portions 260a and 260c may be engaged with the outer peripheral surface and the inner peripheral surface of the component fixing base 206. By either engagement, the protrusion 206h of the component fixing base 206 and the hole 250e of the terminal cover 250 become unnecessary.
[0026]
Further, as shown in FIG. 7, the terminal cover 270 may be made flexible so as to be divided into a plurality of holes 271e and a semi-annular right cover 271 and a left cover 273 having a hole 273e. By forming the terminal cover 270 in this way, the component fixing base 206 can be easily attached to the protrusion 206h even if the terminal cover 270 is flexible. The lead wires of the first and second terminals 206t and 212 and the current interrupting element 220 may be filled with a putty made of an epoxy resin and a curing material to form a cover.
[0027]
【The invention's effect】
As described above, according to the present invention, the current interrupting element that is inserted into the stator core and fixed on the end of the wound winding, detects the temperature of the winding, and interrupts the circuit, By housing the lead wire of the winding and covering the terminal portion to be connected to the external line, the terminal block has a plurality of functions and has an effect of suppressing the axial dimension of the electric motor.
[0028]
In addition, a conductive first terminal connected to the lead wire of the winding and connected to the external wire and fixed to the end of the wound coil inserted into the stator core and wound, By providing a current interrupting element that detects the temperature and interrupting the circuit, a component fixing part that accommodates the second terminal that fixes the lead wire of the current interrupting element, and a cover part that closes the component fixing part, The terminal block has a plurality of functions and has an effect that the axial dimension of the electric motor can be suppressed.
[0029]
In addition, a winding fixing base that is inserted into the stator core and fixed on the end of the wound winding, and fixed on the winding fixing base and connected to the lead wire of the winding A conductive first terminal connected to the external line, a current interrupting element for detecting the temperature of the winding and interrupting the circuit, and a component fixing part for accommodating a second terminal for fixing the lead wire of the current interrupting element; By providing the cover portion that closes the component fixing portion, the terminal block has a plurality of functions, the axial dimension of the motor can be suppressed, and the terminal block can be easily fixed to the winding. effective.
[0030]
In addition, since the component fixing portion is provided with a plurality of protrusions and the cover portion is provided with a plurality of holes to be engaged with the plurality of protrusions, the terminal cover can be easily engaged and fixed to the terminal block. There is an effect that insulation from the outer wall of the electric motor can be easily secured.
[0031]
Further, since the cover portion engages with the periphery of the component fixing portion and covers the component fixing portion, there is an effect that the engagement between the terminal block and the cover portion can be achieved with a simple configuration.
[0032]
Further, since the cover portion is made of an inflexible member, there is an effect that the cover portion can be easily attached to the terminal block.
[0033]
Further, since the cover part is divided into a plurality of parts, there is an effect that even a flexible cover part can be easily attached to the terminal block.
[0034]
Further, the winding fixing base has an effect that it is easy to fix the terminal block by having the protruding piece engaged with the teeth of the inner diameter portion of the stator core.
[0035]
In addition, a portion having a U-shaped cross section is formed in the main body housing, and the terminal block is supported by the U portion of the housing and is not moved by being searched for in this portion.
[0036]
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an electric motor according to Embodiment 1 of the present invention.
2 is a longitudinal sectional view of an iron core, windings, and a terminal block in the electric motor of FIG. 1. FIG.
FIG. 3 is an exploded perspective view of a terminal block in the electric motor of FIG. 1;
4 is a front view (a) and a side view (b) of a winding fixing base of a terminal block in the electric motor of FIG. 1. FIG.
5 is a front view (a) and a side view (b) of a component fixing base of a terminal block in the electric motor of FIG. 1. FIG.
FIG. 6 is a perspective view showing another example of the terminal cover of the terminal block in the electric motor according to Embodiment 1 of the present invention.
FIG. 7 is a front view showing still another example of the terminal cover of the terminal block in the electric motor according to Embodiment 1 of the present invention.
FIG. 8 is a perspective view of a terminal block of a conventional electric motor.
FIG. 9 is a cross-sectional view showing a mounting state of a terminal block of a conventional motor.
[Explanation of symbols]
102 rotor, 102h shaft, 104 stator core,
104e Stator core hole, 106 windings, 106L lead wire,
110, 112 housing, 110u section, 200 terminal block,
200r terminal block hole, 202 winding fixing base, 206 component fixing base,
206h protrusion, 206t first terminal, 206u recess,
212 second terminal, 220 current interrupting element,
250, 260, 270 terminal cover,
250e, 271e, 273e holes, 260a outer flange,
260c Inner buttock.

Claims (6)

A winding fixing base that is inserted into the stator core and fixed on the end of the wound winding;
A first terminal of conductive fixed to the winding on the fixing base connected to an external line is connected with the lead wire of the winding, a current cut-off device for interrupting the circuit by detecting the temperature of the windings And a component fixing portion for accommodating a second terminal for fixing the lead wire of the current interrupting element,
An insulating cover portion covering the component fixing portion ,
The terminal block for an electric motor , wherein the cover portion having a substantially annular shape is divided into a plurality of portions in a circumferential direction . The motor terminal block according to claim 1 , wherein the component fixing portion is provided with a plurality of protrusions, and the cover portion is provided with a plurality of holes to be engaged with the plurality of protrusions. The motor terminal block according to claim 1 , wherein the cover portion engages with a periphery of the component fixing portion and covers the component fixing portion. The motor terminal block according to any one of claims 1 to 3 , wherein the cover portion is made of a non-flexible member. The electric motor terminal block according to any one of claims 1 to 4, wherein the winding fixing base includes a protruding piece that is engaged with a tooth of an inner diameter portion of the stator core. The terminal block of the electric motor according to any one of claims 1 to 5, wherein a portion having a U-shaped cross section is formed in the main body housing and searched for in the portion.

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