JP2589961B2 - Motor energization control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor power supply control device provided in an electric circuit such as a compressor motor of a refrigerator.

[0002]

2. Description of the Related Art Generally, a compressor motor of a refrigerator is used.
In operation, start the motor via the start relay.
I try to make it. This starting relay has a positive characteristic
Thermistors are commonly used.
Start for a few seconds after power on
Current to the auxiliary winding of the motor through the
After that, the electric resistance is increased by self-heating,
Switch the circuit to a circuit that passes through a running capacitor
It has become.

The positive temperature coefficient thermistor includes a plurality of terminal plates and the like.
Both are integrated into an outer case
It is assembled as an energization control device. And the end
Faston tabs on one end of the child board lead to the outside of the outer case.
Has been issued.

[0004]

However, in the conventional energization control device, the creepage distance between the faston tabs of the terminal plate led out of the outer case is short, so that dust adheres to the outer surface of the outer case and absorbs moisture. In such a case, there is a problem in that the withstand voltage characteristic is reduced, a creeping discharge occurs between the faston tabs, and tracking destruction is caused. In addition, an overload protection mechanism is configured inside the outer case.
Bimetal and a heater are provided, and the heater is
Heat is generated when an overload is applied to the
The bimetal deforms, and the motor is energized by this deformation.
The circuit breaks to prevent motor burnout.
Here, the positive temperature coefficient thermistor or
If the metal is just stored, the motor
Is operating normally, but the bimetal is
-Malfunction due to the influence of heat from the self-heating of the
There is a risk of rubbing .

[0005] The present invention has been made in view of such points, and an object, it is possible to reliably prevent the generation of creeping discharge to extend the creepage distance between the faston tab, and the positive Characteristic thermistor heat
An object of the present invention is to provide a motor energization control device that can reliably prevent malfunction of an immetal .

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a flat starting plate having electrodes on both sides.
Positive characteristic thermistor that composes relay and overload protection mechanism
And an outer case having an internal space for holding the positive temperature coefficient thermistor , the bimetal, and the heater, and a faston tab held at the outer case and having one end side facing the surface of the positive temperature coefficient thermistor. A terminal plate led out in a direction parallel to the outer surface of the outer case, wherein the motor energization control device exposes a connection portion on an outer end surface of the outer case in a direction opposite to a direction in which the faston tab is led out, outer case, the outer end face of the lead-out direction of the Faston tabs, and in a plane which projects higher than the tip portion of the faston tabs, the outer
The interior of the packaging case is divided into two storage rooms by a partition wall,
The positive temperature coefficient thermistor is stored in one of the storage chambers,
The bimetal and heater are stored in the other storage room
And the heater is arranged facing the vicinity of the bimetal.
It is intended to be.

[0007]

[Function] In the outer case, since the outer end face of the Faston tab in the extending direction protrudes higher than the front end of the Faston tab, the creepage distance between the Faston tabs becomes longer, so that dust adheres to the outer end face and moisture is absorbed. Even in such a case, it is possible to ensure sufficient withstand voltage characteristics and prevent the occurrence of creeping discharge. Also, inside the outer case is a partition wall
It is divided into two storage rooms, one of which is
Positive thermistor and bimetal are stored separately from the delivery room
As a result, the effect of the heat of the PTC thermistor is
It does not span metal, and therefore bimetal
Can be prevented from malfunctioning .

[0008]

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes an outer case in which an upper case 2 and a lower case 3 are opposed to each other, and the upper case 2 and the lower case 3 are made of synthetic resin and fastened with rivets 4.4. . Partition walls 5.6 are integrally formed in the intermediate portions inside the upper case 2 and the lower case 3, respectively, and the inside of the outer case 1 is divided into two airtight storage chambers 7.8 by these partition walls 5.6. It is partitioned.

A thermistor 10 having positive characteristics is stored in one storage chamber 7, and a bimetal 11 and a heater 12 are stored in the other storage chamber 8.

A protruding portion 13 extends integrally from an intermediate portion of the upper surface of the storage chamber 7 and a part of the thermistor 10 faces the protruding portion 13. A support plate 15 is fitted on the outer periphery of the thermistor 10, and the thermistor 10 is supported in the storage chamber 7 via the support plate 15.

A terminal plate 1 is provided on one side of the thermistor 10.
6.17, and a terminal plate 18 is provided on the other side surface. Electrodes 19.19 for conduction are arranged between the terminal plate 16.18 and the side surface of the thermistor 10, and these electrodes 19.19 are connected to the thermistor 10 and the terminal plate 16.18 as shown in FIG. Spring portions 19a. 19b.

A connecting portion 17 is provided at the lower end of the terminal plate 17.18.
a. 18a are integrally formed and the terminal plate 16.17.18
Has a faston tab 16b. 17b. 18b and I
ing. And faston tab 1 of terminal board 16.17
6b. 17b is the protrusion 13 of the outer case 1.
It is led out to one side and the Faston tab 1 of the terminal plate 18
8b is led out to the other side of the protruding portion 13.

The side surface of the projection 13 is in contact with the surface of the thermistor 10.
Facing each other. The faston tab 16b. 1
7b. 18b is a direction parallel to the outer surface of the protrusion 13
And the projection 13 is fastened to the faston tab 16.
b. 17b. 18b is the fastest
Tab 16b. 17b. Projecting higher than the tip of 18b
It has a planar shape.

The bimetal 11 stored in the storage room 8
Is supported by the upper case 2 by screws 21 so as to be inclined at an angle of 32 ° with respect to the longitudinal direction of the outer case 1. The heater 12 is provided as shown in FIGS.
The bimetal 1 is located near the bimetal 11
1 and is bent in a meandering manner so that radiant heat can be effectively emitted to the bimetal 11. Further, a terminal plate 23.2 is provided in the storage room 8.
4.25 is provided, one end of the heater 12 is connected to the terminal plate 23, and the other end is connected to the terminal plate 24, respectively.
A connection portion 25a is formed at a lower end of the terminal plate 25. The upper ends of these terminal boards 23.24.25 are faston tabs 23b. 24b. 25 b is led out to the upper surface side of the upper case 2.

A movable contact 2 is provided at both ends of the bimetal 11.
6. The fixed contact 28 is attached to the terminal plate 25 so as to face one movable contact 26, and the other movable contact 27 is attached to the terminal plate 25.
The fixed contacts 29 are respectively attached to the terminal plates 24 so as to face each other.

The lower surface of the lower case 3 is provided with the terminal plate 17.
Connection 17a at 18.25. 18a. Opposed to 25a, through hole 31.32.3 for insertion of plug pin of motor
3 are formed, and the connection portions 17a. 18a. 25a
The faston tab through the through holes 31.32.3.3
17b. 18b. 25b
The base 1 is exposed on the outer end surface.

FIG. 8 shows an electric circuit.
6 is a main winding of the motor, 37 is an auxiliary winding, one end of the main winding 36 and one end of the auxiliary winding 37 are respectively connected to one fixed contact 28, and the other fixed contact 29 connects the heater 12 in series. Is connected to one terminal of the power supply 35 via the. The other end of the main winding 36 is connected to the other terminal of the power supply 35, and the other end of the auxiliary winding 37 is connected to the other terminal of the power supply 35 via the thermistor 10 and a starting capacitor 38 in series. Connected to the thermistor 1
A running capacitor 39 is connected in parallel to a series circuit of 0 and a starting capacitor 38.

When the power supply 35 is turned on, a current flows through the auxiliary winding 37 through the starting capacitor 38 and the thermistor 10 for a few seconds after that, and then the thermistor 10 self-heats. The circuit is switched, a current flows through the auxiliary winding 37 through the running capacitor 39, and the steady rotation of the motor is maintained. Further, when an overload is applied to the motor, the heater 12 generates heat, and accordingly, the bimetal 11 is deformed so as to be inverted. In this operation, the movable contact 26.27 is separated from the fixed contact 28.29. Then, the power supply to the main winding 36 and the auxiliary winding 37 is cut off, thereby preventing burning of the motor.

Thermistor 10 generates about 200
° C to maintain this temperature, but with the thermistor 10 and the bimetal 11 in separate storage compartments 7.8.
Therefore, the influence of the heat of the thermistor 10 does not reach the bimetal 11, so that the occurrence of malfunction of the bimetal 11 can be reliably prevented. Also, when the motor is overloaded,
The heating heater 12 is located near the bimetal 11.
It is arranged so as to face the bimetal 11, and
The bimetal 11 with good responsiveness when the heater 12 generates heat.
It can be operated reliably .

Terminal plate 16.1 derived from outer case 1
7 Faston tab 16b. 17b and the terminal board 18
Aston tab 18b is separated by projection 13 of outer case 1.
And the faston tab 16b. 17
b. The outer end face of the protruding portion 13 in the extending direction of 18b is fast.
Tab 16b. 17b. Projecting higher than the tip of 18b
The faston tab 16b. 17b and fast
Creepage distance with the tab 18b becomes longer,
Dust adhered to the outer end surface of the protrusion 13 and became a moisture absorbing state .
Even in cases such as the
Breakage can be prevented.

The outer end surface of the projection 13 is flat.
Therefore, this energization control device is
The outer end of the planar projection 13 when mounted on the device
Pressing the surface with your fingertips makes it easy to do the work
The outer end face of the portion 13 has a faston tab 16b. 17b. 18
Since it protrudes higher than the tip of b, the Faston tab
16b. 17b. 18b is hard for fingers to touch,
Faston tab 16b. 17b. Inadvertent deformation of 18b
Can be prevented, and the fats and oils of the fingers can be removed from the faston tab 16b.
17b. Inconvenience such as oxidation due to adhesion to 18b
Can be prevented.

[0023]

As described above, according to the present invention,
Creeping discharge can be suppressed to prevent tracking destruction,
Further, it can be easily mounted on the device, and further, careless deformation and oxidation of the faston tab can be prevented. So
To partition the inside of the outer case into two storage rooms with a partition wall.
The positive thermistor is divided into one storage room and the other storage room.
Positive temperature thermistor
The heat of the heater does not affect the bimetal,
Therefore, malfunction of the bimetal can be prevented .

[Brief description of the drawings]

FIG. 1 is a side view of a motor power supply control device according to an embodiment of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a top view of the same.

FIG. 4 is a side sectional view of the same.

FIG. 5 is a plan view showing an internal structure of a lower case in the power supply control device.

FIG. 6 is a plan view of a conduction portion between a thermistor and a terminal plate in the power supply control device.

FIG. 7 is a perspective view of a terminal plate in the power supply control device.

FIG. 8 is an electric circuit diagram of the energization control device.

[Explanation of symbols]

 1: Exterior case 10: Thermistor 16.17.18: Terminal plate 16a. 17a. 18a ... connection part 16b. 17b. 18b: Faston tab 19: Electrode

Claims (2)

(57) [Claims] 1. A flat starting relay having electrodes on both surfaces.
Configure the PTC thermistor and the overload protection mechanism.
A bimetal and a heater, and the PTC thermistor ;
Bimetal, an outer case having an inner space for holding a heater, and a faston tab held by this outer case and having one end side led out in a direction parallel to the outer surface of the outer case facing the surface of the positive temperature coefficient thermistor. A terminal plate; and a motor energization control device having a connection part exposed on an outer end surface of the outer case in a direction opposite to a direction in which the faston tab is led out. However, it has a planar shape protruding higher than the tip end of the faston tab, and the inside of this exterior case is partitioned by a partition wall.
Is divided into two storage rooms, and one of the storage rooms
The positive temperature coefficient thermistor is stored in the other storage room.
The bimetal and the heater are housed, and the heater
Is disposed opposite to and near the bimetal . Wherein said terminal plate has a motor activation control apparatus according to claim 1, characterized that you have to have the said connecting portion at an end portion opposite to the Faston tabs.