JP3026639B2 - Motor phase separation starter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a phase split starter for a motor.

[0002]

2. Description of the Related Art A conventional phase splitting starter for a motor is constructed as shown in, for example, Japanese Utility Model Publication No. 61-111985. Here, a conventional example will be described with reference to this publication. In FIG. 9, reference numeral 50 denotes a main winding, which is connected in series with the coil 52 of the starting relay 51. An auxiliary winding 53 is connected in series with the capacitor 54. A circuit in which a positive temperature coefficient thermistor 55 and a normally open relay contact 56 of the start relay 51 are connected in series is connected to this capacitor in parallel.

[0003] In the motor phase separation starting device having this structure, the normally open relay contact 56 of the starting relay 51 is opened after the motor is started, so that no current flows through the positive characteristic thermistor 55 during operation, and the positive characteristic during operation is reduced. The power loss due to the thermistor 55 can be suppressed.

[0004]

However, the conventional phase split starter for a motor only shows a circuit in which the positive characteristic thermistor 55 is incorporated in the start relay 51.
Nothing is shown about the assembly structure of the starting relay 51 and the PTC thermistor 55.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a motor phase separation starting device in which a starting relay and a positive temperature coefficient thermistor are separately assembled, and a positive temperature coefficient thermistor is attached to the starting relay to be integrally formed. is there.

[0006]

The present invention comprises a main winding, an auxiliary winding, a starting relay, a positive temperature coefficient thermistor, and a capacitor, and the starting relay is connected in series to the main winding. Formed by a starting relay coil and a relay contact connected in series to the auxiliary winding in parallel with the relay coil,
In a motor phase-separation starter in which a positive-characteristic thermistor is connected in series to the relay contact and a capacitor is connected in parallel to a series circuit of the relay contact and the positive-characteristic thermistor, the start relay and the positive are separately provided on an independent bobbin and case, respectively. A characteristic thermistor is housed, and a case of a positive characteristic thermistor is attached to the bobbin of the activation relay on the surface of the bobbin on the side opposite to the closed container, and is integrally formed.

[0007]

According to the present invention, as described above,
After assembling the starting relay and the positive temperature coefficient thermistor separately, attach the case of the positive temperature coefficient thermistor to the bobbin of these starting relays so that the arc discharge of the relay contact of the starting relay does not affect the positive temperature coefficient thermistor. , The positive temperature coefficient thermistor is not heated by the compressor.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in the drawings.

FIG. 1 is a sectional view of a main part showing a state in which a starting device is mounted on a hermetic compressor according to an embodiment of the present invention. FIG. 2 is a circuit diagram of the electric motor. FIG. 3 is a front view of the activation device. FIG. 4 is a plan view of the activation device. FIG. 5 is a sectional view taken along the line AA of FIG. FIG. 6 is an exploded cross-sectional view of a main part of the activation device. FIG.
FIG. 3 is a plan view in which an overload relay is attached to a starting device.

Reference numeral 1 denotes a closed container in which a single-phase motor 2 and a compression element 3 are housed. 4 is a closed container 1
And a starter 5 for starting the single-phase motor 2 is mounted on the outer wall of the closed casing 1. The single-phase motor 2 is formed by connecting a main winding 6 and an auxiliary winding 7 in parallel.

The starting device 5 includes a starting relay 8, a positive temperature coefficient thermistor 9, and a capacitor 10. These parts are separately assembled. The starting relay 8 includes a bobbin 11 made of an insulating material, a relay contact mechanism 12, and a starting relay coil 13.

The bobbin 11 has a cylindrical first case 14.
And a flange 16 having a recess 15 at one end of the case, a lid 17 for closing the recess 15 of the flange, and a projection 18 protruding at the other end.

The relay contact mechanism 12 includes a plunger 20 which slides in a hole 19 of the first case 14, a dynamic shaft 21 inserted into the center of the plunger, and a flange 16 connected to the dynamic shaft. A movable contact plate 22 disposed in the recess 15 of the first contact point, and a first contact 23 provided in the movable contact plate.
And a second contact 24 provided on the lid 17, a normally open relay contact 25, a plunger 20, and a movable contact plate 2.
2 and a coil spring 26 wound around the driving shaft 21.

The starting relay coil 13 is wound around the outer periphery of the first case 14 between the flange 16 and the projection 18.

Reference numeral 27 denotes a second housing for storing the positive temperature coefficient thermistor 9.
In this case, the second case is mounted by fitting the flange 16 on the surface on the opposite side of the closed casing 1. Then, the second case 27 is fixed together by covering the lid 17 that covers the concave portion 15 of the flange 16 of the bobbin 11.

The bobbin 11 has an overload relay 28
Is installed.

A contact 30 of an overload relay 28 is connected in series to a common line 29 between the main winding 6 and the auxiliary winding 7. A starting relay coil 13 of a starting relay 8 is connected to the main winding 6 in series. A capacitor 10 is connected to the auxiliary winding 7 in series. This capacitor has a positive contact thermistor 9 and a normally open relay contact 2 of the starting relay 8.
5 are connected in parallel.

A description will be given of the assembling sequence of the starting device 5 in the phase split starting device of the compressor having the above-described structure. First, the starting relay 8 inserts the relay contact mechanism 12 into the hole 19 of the bobbin 11. Bobbin flange 16 and projection 1
The starting relay coil 13 is wound around the outer periphery sandwiched between the starting relay coil 8 and the starting relay coil 8. Further, the positive temperature coefficient thermistor 9 is formed by being housed in the second case 27. The starting relay 8 and the positive temperature coefficient thermistor 9 are integrally formed by attaching the second case 27 to the bobbin 11. The starting device 5 is completed by fixing the integrated bobbin and the case with the lid 17 placed thereon.

Next, the operation of the circuit will be described. When the single-phase motor 2 is energized, the circuit of the auxiliary winding 7, the characteristic thermistor 9, and the normally open contact 25 of the starting relay 8 forms the motor 2.
Starts. At the same time, the circuit of the main winding 6 is also energized, so that the activation relay in this circuit is activated. At the same time, the circuit of the main winding 6 is also energized, so that the activation relay coil 13 in this circuit is energized. When the motor 2 finishes starting, the normally open contact 25 of the starting relay 8 is disconnected by the current flowing through the main winding 6, and no current flows through the positive temperature coefficient thermistor 9. The single-phase motor 2 is operated with high operation efficiency by the condenser 10.

When the starting device 5 is attached to the hermetic terminal 4 of the hermetic container 1 and the PTC thermistor 9 is mounted separately from the hermetic container 1, the PTC thermistor is affected by heat from the compressor. It is designed to prevent a start error from being reached at the Curie point.

The starting relay 8 and the positive temperature coefficient thermistor 9 are separately assembled so that the positive temperature coefficient thermistor 9 is not affected by the arc discharge due to the opening and closing of the starting relay contact 25, and the starting relay 8 and the positive temperature coefficient thermistor 9 are combined. The combination with 9 can be easily changed. Moreover, the bobbin 11 of the starting relay 8 and the positive characteristic thermistor 9
The material of the second case 27 can be selected according to the influence of heat, the sealed state, and the like.

PTC thermistor 9 and starting relay contact 25
When the relay contact is opened, power consumption in the positive characteristic thermistor 9 can be eliminated when the relay contact is opened, and when the starting relay contact 25 is welded, the resistance of the positive characteristic thermistor 9 is increased to assist. Winding 7
Protection.

The starting device 5 is assembled so that components such as the relay contact mechanism 12, the positive temperature coefficient thermistor 9, and the lid 17 can be supplied from the same direction, thereby enabling automation.

The present invention incorporates the second case 27 for accommodating the positive characteristic thermistor 9 in the bobbin 11 of the separately assembled starting relay 8, so that the starting relay 8 and the positive characteristic thermistor 9 can be made independent. The positive temperature coefficient thermistor 9 is not affected by the arc discharge of the contact 25.

Incidentally, as shown in FIG.
Is stored in the vertically long case 31, so that the activation device 5
Has the same effect, and also has the effect that the width can be reduced and the installation space for the compressor can be reduced.

[0026]

As described above, according to the present invention, the main winding, the auxiliary winding, the starting relay, the positive temperature coefficient thermistor,
A starting relay coil connected in series with the main winding, and a relay contact connected in series with the auxiliary winding in parallel with the relay coil, and a positive temperature coefficient thermistor. In a phase separation starting device for an electric motor in which a relay is connected in series to the relay contact and a capacitor is connected in parallel to a series circuit of the relay contact and the positive temperature coefficient thermistor, a starting relay and a positive temperature coefficient thermistor are respectively provided on an independent bobbin and a case. The bobbin of the starting relay is attached to the bobbin of the starting relay, and the case of the positive characteristic thermistor is attached to the surface of the bobbin opposite to the closed container, so that the bobbin of the starting relay and the case of the positive characteristic thermistor are made independent. Accordingly, it is possible to prevent the positive temperature coefficient thermistor from being affected by the arc discharge of the starting relay contact and causing a starting failure. Also, by assembling the starting relay and the positive temperature coefficient thermistor separately, the combination of these starting relays and the positive temperature coefficient thermistor can be easily changed, and the positive temperature coefficient thermistor can be separated from the closed container, and from this container. This prevents the positive temperature coefficient thermistor from exceeding the Curie point and causing a starting error due to the heat of the above.

[Brief description of the drawings]

FIG. 1 is a fragmentary sectional view showing a state in which a starting device is mounted on a hermetic compressor according to one embodiment of the present invention.

FIG. 2 is a circuit diagram of the electric motor of the present invention.

FIG. 3 is a front view of the activation device of the present invention.

FIG. 4 is a plan view of the activation device of the present invention.

FIG. 5 is a cross-sectional view of the present invention taken along line AA of FIG. 4;

FIG. 6 is an exploded cross-sectional view of a main part of the activation device of the present invention.

FIG. 7 is a plan view in which an overload relay is attached to the starting device of the present invention.

FIG. 8 is an exploded main part sectional view of an activation device showing another embodiment of the present invention.

FIG. 9 is a circuit diagram of a conventional electric motor.

[Explanation of symbols]

 Reference Signs List 6 Main winding 7 Auxiliary winding 8 Starting relay 9 Positive thermistor 10 Capacitor 11 Bobbin 12 Relay contact mechanism 13 Starting relay coil 14 First case 20 Plunger 25 Ilray contact 27 Second case

Continuation of the front page (72) Inventor Hiroshi Hirano 2-18 Keihanhondori, Moriguchi City Sanyo Electric Co., Ltd. (56) References JP-A-5-15123 (JP, A) JP-A-3-136302 (JP, A) Japanese Utility Model Showa 58-172393 (JP, U) Japanese Utility Model Showa 56-166792 (JP, U) Japanese Utility Model Showa 63-55588 (JP, U) Japanese Utility Model Showa 61-11985 (JP, Y) (58) Survey Field (Int.Cl. ⁷ , DB name) H02K 17/08 H02K 17/30 H02P 1/42

Claims (1)

(57) [Claims] A main winding, an auxiliary winding, a starting relay,
It comprises a positive temperature coefficient thermistor and a capacitor, and the starting relay is formed by a starting relay coil connected in series to the main winding, and a relay contact connected in series to the auxiliary winding in parallel with the relay coil. A positive-characteristic thermistor connected in series to the relay contact, and a capacitor connected in parallel to a series circuit of the relay contact and the positive-characteristic thermistor, wherein the starting relay and the positive-characteristic thermistor are connected. Wherein the bobbin is integrally formed by attaching a case to a surface of the bobbin on a surface opposite to the closed container, wherein the bobbin is integrally formed. .