JP2007259546A - Starter for motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To raise energy efficiency, concerning a motor starter. <P>SOLUTION: A motor starter, which has a main winding and a sub winding, is equipped with a first positive characteristic thermistor, a semiconductor switch which is connected in series with the first positive characteristic thermistor, a second positive characteristic thermistor 106 which switches on or switches off the semiconductor switch, being connected in parallel with the first positive characteristic thermistor and the semiconductor switch, and a case 111 which houses the second characteristic thermistor 106. At least one part of the case 111 is provided with a heat-insulating layer and power consumption of the starter is reduced. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a motor starting device composed of a single-phase induction motor equipped with a positive temperature coefficient thermistor.

  Conventionally, devices using a positive temperature coefficient thermistor have been widely used as motor starting devices.

  However, in recent years, it has been desired that the energy efficiency is high considering the global environment, and attention is paid to the fact that the power supply voltage continues to be applied to the positive temperature coefficient thermistor even after the motor is started. Some have cut off the power supply voltage applied to a positive temperature coefficient thermistor after starting (for example, refer to patent documents 1).

  Hereinafter, the conventional motor starting device will be described with reference to the drawings.

  FIG. 19 is a circuit diagram using a conventional motor starting device described in Patent Document 1, FIG. 20 is an essential part assembly diagram of a conventional motor starting device, and FIG. 21 is an enlarged view of part A of FIG.

  In FIG. 19, the motor 2 constituting the single-phase induction motor includes a main winding 10 and an auxiliary winding 3 and is connected to an AC power source 7.

  The starting device 1 includes a first positive temperature coefficient thermistor 4 connected in series to the auxiliary winding 3 of the motor 2, a semiconductor switch 5 connected in series to the first positive temperature coefficient thermistor 4, and a first positive temperature coefficient thermistor 4. A circuit is constituted by a second positive temperature coefficient thermistor 6 connected to the auxiliary winding 3 of the motor 2 via the electrode plate A13 in parallel with the semiconductor switch 5.

  The first positive temperature coefficient thermistor 4 and the second positive temperature coefficient thermistor 6 are made of, for example, an oxide semiconductor ceramic mainly composed of barium titanate, and have a Curie temperature. It has a characteristic that the value increases rapidly, and self-heat is generated when a current flows, and the electric resistance value increases rapidly.

  The semiconductor switch 5 has a first terminal Ta, a second terminal Tb, and a gate terminal G. The gate terminal G is connected to the second positive temperature coefficient thermistor 6 through an electrode plate B14.

  The gate terminal G is connected to the second positive temperature coefficient thermistor 6 through the electrode plate B14.

  When a constant current flows through the gate terminal G, the first terminal Ta and the second terminal Tb are turned on. When no current flows through the gate terminal G, the first terminal Ta and the second terminal Tb are turned off. However, when no current flows through the second positive temperature coefficient thermistor 6, the resistance value of the second positive temperature coefficient thermistor 6 is small, so that a constant current flows through the gate terminal G, and between the first terminal Ta and the second terminal Tb. Is turned on.

  In addition, when a current flows through the second positive characteristic thermistor 6, the resistance value of the second positive characteristic thermistor 6 increases and the current at the gate terminal G decreases, so that there is a gap between the first terminal Ta and the second terminal Tb. It becomes OFF.

  FIG. 20 is an assembly diagram of a main part of a conventional motor starting device. In FIG. 21, which is an enlarged view of part A, one surface electrode B 6 b of the opposite electrode surfaces of the second positive temperature coefficient thermistor 6 is a case. 11, the electrode plate B14 is connected to the gate terminal G of the semiconductor switch 5.

  The other surface electrode A6a of the electrode surface of the second positive characteristic thermistor 6 is connected to the auxiliary winding 3 via the electrode plate A13.

  The operation and action of the motor starting device configured as described above will be described below.

  When electricity is supplied from the AC power supply 7, a starting current flows through the main winding 10. At the time of start-up, since the temperature of the second positive temperature coefficient thermistor 6 is low and the resistance value is small, a current flows through the gate terminal G, so that the semiconductor switch 5 is turned on.

  Further, since the temperature of the first positive characteristic thermistor 4 is also low and the resistance value is small, a starting current flows through the auxiliary winding 3 and the motor 2 starts operation.

  After the motor 2 is started, the first positive temperature coefficient thermistor 4 self-heats above the Curie temperature within a few seconds, so that the electric resistance value increases rapidly and the current of the auxiliary winding 3 decreases. Disconnected.

  Normally, the first positive temperature coefficient thermistor 4 continues to maintain the self-heating necessary to maintain a high electric resistance value, and thus continues to consume several watts of power during the operation of the motor 2.

  Furthermore, since the power supply voltage is also applied to the second positive temperature coefficient thermistor 6, it self-heats, the resistance value increases and the resistance value increases, so the current to the gate terminal G decreases and the semiconductor switch 5 is turned OFF. .

When the semiconductor switch 5 is turned off, the application of the power supply voltage to the first positive temperature coefficient thermistor 4 is cut off, so that the power consumption of the first positive temperature coefficient thermistor 4 does not occur and power saving can be achieved.
JP-A-6-339291

  However, in the above-described conventional configuration, the heat of the second positive temperature coefficient thermistor 6 is thermally conducted to the space and the case 11 to dissipate heat, and the heat radiation to the surroundings is large and a sufficient temperature rise cannot be obtained. There was a problem that the increase in value was reduced and the power consumption was increased.

  The present invention solves the above-described conventional problems, and an object thereof is to provide a motor starter with high energy efficiency.

  In order to solve the above-described conventional problems, a motor starting device according to the present invention includes a first positive temperature coefficient thermistor connected in series to an auxiliary winding, and a semiconductor switch connected in series to the first positive temperature coefficient thermistor. A second positive characteristic thermistor connected in parallel with the positive first sex thermostat and turning on / off the semiconductor switch, and a case containing at least the second positive characteristic thermistor, the second positive characteristic A heat insulating layer is provided in a part of the contact portion between the thermistor and the case, and the heat of the second positive temperature coefficient thermistor can be suppressed from being transferred to the case and dissipated by the heat insulating effect of the heat insulating layer. The power consumption of the second positive temperature coefficient thermistor can be saved.

  The motor starter of the present invention can provide a motor starter with high energy efficiency.

  The invention according to claim 1 is a motor starting device having a main winding and an auxiliary winding, the first positive temperature coefficient thermistor connected in series to the auxiliary winding, and the first positive temperature coefficient thermistor A semiconductor switch connected in series with the semiconductor device, a first positive temperature coefficient thermistor, a second positive temperature coefficient thermistor connected in parallel with the semiconductor switch and controlling on and off of the semiconductor switch, and a second positive temperature coefficient thermistor The second positive temperature coefficient thermistor is sandwiched by the case, and at least a part of the case is provided with a heat insulating layer, so that the heat of the second positive temperature coefficient thermistor is transferred to the case. The heat loss of the heating element is reduced and the heat dissipation of the heating element is reduced, so that the power consumption of the heating element can be reduced, the power consumption of the starter is small, and the motor has high power consumption and energy efficiency It is possible to provide a startup device.

  The invention according to claim 2 is the invention according to claim 1, wherein the heat insulating layer is formed of a vacuum heat insulating material made of a core material and a non-breathable jacket material covering the core material, Since the heat loss of the second positive temperature coefficient thermistor due to the heat insulating effect of the heat insulating material is reduced, the power consumption of the second positive temperature coefficient thermistor can be reduced, and the power consumption of the starting device can be reduced.

  The invention according to claim 3 is the invention according to claim 1, wherein the heat insulating layer is formed of a paint-type heat insulating material applied to the surface of the case that contacts the second positive temperature coefficient thermistor. The heat insulation effect can be obtained with a simple process of simply applying a coating type heat insulating material on the surface of the material, and the heat loss of the second positive temperature coefficient thermistor can be reduced, so the power consumption of the second positive temperature coefficient thermistor can be reduced. Furthermore, the power consumption of the starter can be reduced at a low cost.

  The invention according to claim 4 is the invention according to claim 1, wherein the heat insulating layer is formed of an air layer defined by the closed space, and the air layer of the closed space is formed on the surface of the case. Because the heat loss of the second positive temperature coefficient thermistor is reduced by the heat insulation effect of the air layer, no special heat insulating material is required, assembly is easy, and the power consumption of the starter is reduced. can do.

  The invention according to claim 5 is the invention according to claim 1, wherein the heat insulating layer is formed of a foamed resin, and the second positive temperature coefficient thermistor is formed by the heat insulating effect of the bubbles formed in the foamed resin. The heat loss is reduced, and since it is a resin molded product, it is easy to process and assemble, and can be manufactured at low cost.

  The invention according to claim 6 is the invention according to claim 1, wherein the heat insulating layer is formed of meta-aramid paper, and the heat loss of the second positive temperature coefficient thermistor due to the heat-insulating effect of the meta-aramid paper. Therefore, the power consumption of the heating element can be reduced, and the power consumption of the activation device can be reduced.

  The invention according to claim 7 is the invention according to claim 1, wherein the heat insulating layer is formed of a material having a thermal conductivity of 0.7 W / m · K or less, and the second is because the thermal conductivity is small. The heat loss of the positive temperature coefficient thermistor is reduced, and since it is a resin molded product, it is easy to process and assemble, and can be manufactured at low cost.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments.

(Embodiment 1)
1 is a circuit diagram of a motor starting device according to Embodiment 1 of the present invention, FIG. 2 is an essential part assembly diagram of the motor starting device according to Embodiment 1 of the present invention, and FIG. 3 is an internal view of FIG. It is the B section enlarged view which shows the cross section of a structure.

  Hereinafter, the present embodiment will be described with reference to FIGS. 1, 2, and 3.

  In FIG. 1, a motor 102 constituting a single-phase induction motor includes a main winding 110 and an auxiliary winding 103, and is connected to an AC power source 107. The starting device 101 includes a first positive temperature coefficient thermistor 104 connected in series to the auxiliary winding 103 of the motor 102, a semiconductor switch 105 connected in series to the first positive temperature coefficient thermistor 104, and a first positive temperature coefficient thermistor. A circuit is constituted by a second positive temperature coefficient thermistor 106 connected to the auxiliary winding 103 of the motor 102 via the electrode plate A113 in parallel with the semiconductor switch 104 and the semiconductor switch 105.

  The first positive temperature coefficient thermistor 104 and the second positive temperature coefficient thermistor 106 self-heat when a current flows, and the electric resistance value rapidly increases.

  The semiconductor switch 105 has a first terminal T1, a second terminal T2, and a gate terminal G1, and the gate terminal G1 is connected to the second positive temperature coefficient thermistor 106 through an electrode plate B114.

  When a constant current flows through the gate terminal G1, the first terminal T1 and the second terminal T2 are turned on. When no current flows through the gate terminal G1, the first terminal T1 and the second terminal T2 are turned off. However, when no current flows through the second positive temperature coefficient thermistor 106, the resistance value of the second positive temperature coefficient thermistor 106 is small, so that a constant current flows through the gate terminal G1, and between the first terminal T1 and the second terminal T2. Is turned on.

  Also, when a current flows through the second positive temperature coefficient thermistor 106, the resistance value of the second positive temperature coefficient thermistor 106 increases and the current at the gate terminal G1 decreases, so that there is a gap between the first terminal T1 and the second terminal T2. It becomes OFF.

  FIG. 2 is an assembly diagram of a main part of a conventional motor starting device. In FIG. 3, which is an enlargement of B portion, one surface electrode B 106 b of the opposite electrode surface of the second positive temperature coefficient thermistor 106 is formed by a case 111. The electrode plate B114 is connected to the gate terminal G1 of the semiconductor switch 105, and the electrode A106a on the other electrode surface is connected to the auxiliary winding 103 via the electrode plate A113. It is connected.

  The second positive characteristic thermistor 106 is included in the case 111, and the second positive characteristic thermistor 106 is sandwiched between the cases 111.

  Furthermore, between the second positive temperature coefficient thermistor 106 and the case 111, a heat insulating layer formed by a vacuum heat insulating material 112 made of a core material and a non-breathable jacket material covering the core material is incorporated. The non-breathable outer jacket material is composed of a plastic film and a laminated film of metal foil.

  The operation and action of the motor starting device configured as described above will be described below.

  When electricity is supplied from the AC power source 107, a starting current flows through the main winding 110. At startup, the temperature of the second positive temperature coefficient thermistor 106 is low and the resistance value is small, so that a current flows through the gate terminal G1, so that the semiconductor switch 105 is turned on.

  Further, since the temperature of the first positive characteristic thermistor 104 is low and the resistance value is small, a starting current flows through the auxiliary winding 103, and the motor 102 starts operation.

  After the motor 102 is started, the first positive temperature coefficient thermistor 104 self-heats above the Curie temperature within a few seconds, so that the electric resistance value increases rapidly, the current of the auxiliary winding 103 decreases, and the auxiliary winding 103 is substantially reduced. Is cut off.

  Further, since the power supply voltage is also applied to the second positive characteristic thermistor 106, self-heating occurs and the resistance value increases.

  At this time, the second positive temperature coefficient thermistor 106 inserts the vacuum heat insulating material 112 excellent in heat insulation between the electrode plate B 114 and the case 111, so that heat radiation to the outside is reduced and the second positive temperature coefficient thermistor 106. Is maintained at a high temperature. For this reason, the resistance value becomes large, the current to the gate terminal G1 of the semiconductor switch 105 becomes very small, and the semiconductor switch 105 is turned OFF.

  When the semiconductor switch 105 is turned off, the application of the power supply voltage to the first positive temperature coefficient thermistor 104 is cut off, so that the power consumption of the first positive temperature coefficient thermistor 104 does not occur and power saving can be achieved.

  Therefore, the power consumption for the heat radiation to the case 111 and the like other than the self-heating power of the second positive temperature coefficient thermistor 106 necessary for turning off the semiconductor switch 105 can be suppressed to a very low level. The power consumption of the positive temperature coefficient thermistor 106 can be suppressed, and an extremely energy efficient motor starting device can be obtained.

(Embodiment 2)
4 is a circuit diagram of a motor starting device according to the second embodiment of the present invention, FIG. 5 is an essential part assembly diagram of the motor starting device according to the second embodiment of the present invention, and FIG. 6 is an internal view of FIG. It is the C section enlarged view which shows the cross section of a structure.

  Hereinafter, the present embodiment will be described with reference to FIGS. 4, 5, and 6.

  In FIG. 4, a motor 202 constituting a single-phase induction motor includes a main winding 210 and an auxiliary winding 203 and is connected to an AC power source 207.

  The starting device 201 includes a first positive temperature coefficient thermistor 204 connected in series to the auxiliary winding 203 of the motor 202, a semiconductor switch 205 connected in series to the first positive temperature coefficient thermistor 204, and a first positive temperature coefficient thermistor. A circuit is constituted by a second positive temperature coefficient thermistor 206 connected to the auxiliary winding 203 of the motor 202 via the electrode plate A 213 in parallel with 204 and the semiconductor switch 205.

  The first positive temperature coefficient thermistor 204 and the second positive temperature coefficient thermistor 206 self-heat when a current flows, and the electric resistance value rapidly increases.

  The semiconductor switch 205 has a first terminal T3, a second terminal T4, and a gate terminal G2, and the gate terminal G2 is connected to the second positive temperature coefficient thermistor 206 through the electrode plate B214.

  When a constant current flows through the gate terminal G2, the first terminal T3 and the second terminal T4 are turned on. When no current flows through the gate terminal G2, the first terminal T3 and the second terminal T4 are turned off. However, when no current flows through the second positive temperature coefficient thermistor 206, the resistance value of the second positive temperature coefficient thermistor 206 is small, so that a constant current flows through the gate terminal G2, and between the first terminal T3 and the second terminal T4. Is turned on.

  Also, when a current flows through the second positive temperature coefficient thermistor 206, the resistance value of the second positive temperature coefficient thermistor 206 increases and the current at the gate terminal G2 decreases, so that there is a gap between the first terminal T3 and the second terminal T4. It becomes OFF.

  FIG. 5 is an essential part assembly diagram of a conventional motor starting device. In FIG. 6, which is an enlargement of part C, one surface electrode B 206 b of the opposing electrode surfaces of the second positive temperature coefficient thermistor 206 is formed in a case 211. The electrode plate B214 is connected to the gate terminal G2 of the semiconductor switch 205, and the electrode A206a on the other electrode surface is connected to the auxiliary winding 203 via the electrode plate A213. It is connected.

  The second positive characteristic thermistor 206 is included in the case 211, and the second positive characteristic thermistor 206 is sandwiched between the cases 211.

  A paint-type heat insulating material 212 is applied to the surface of the case 211.

  The operation and action of the motor starting device configured as described above will be described below.

  When electricity is supplied from the AC power supply 207, a starting current flows through the main winding 210. At startup, the temperature of the second positive temperature coefficient thermistor 206 is low and the resistance value is small, so that a current flows through the gate terminal G2, so that the semiconductor switch 205 is turned on.

  Further, since the temperature of the first positive characteristic thermistor 204 is low and the resistance value is small, a starting current flows through the auxiliary winding 203 and the motor 202 starts operation.

  After the motor 202 is started, the first positive temperature coefficient thermistor 204 self-heats above the Curie temperature within a few seconds, so that the electric resistance value increases rapidly, the current of the auxiliary winding 203 decreases, and the auxiliary winding 203 is substantially reduced. Is cut off.

  Furthermore, since the power supply voltage is also applied to the second positive characteristic thermistor 206, self-heating occurs and the resistance value increases.

  In the present embodiment, the heat of the second positive temperature coefficient thermistor 206 is hardly transmitted to the case 211 because the paint-type heat insulating material 212 that has excellent heat insulation and only needs to be applied is used on the surface of the case 211. The heat radiation to the outside is reduced, and the second positive temperature coefficient thermistor 206 is maintained at a high temperature. For this reason, the resistance value increases, the current to the gate terminal G2 of the semiconductor switch 205 becomes very small, and the semiconductor switch 205 is turned OFF.

  When the semiconductor switch 205 is turned off, the application of the power supply voltage to the first positive temperature coefficient thermistor 204 is cut off, so that the power consumption of the first positive temperature coefficient thermistor 204 does not occur and power saving can be achieved.

  Accordingly, the power consumption for the heat radiation to the case 211 other than the self-heating power of the second positive temperature coefficient thermistor 206 necessary for turning off the semiconductor switch 205 can be suppressed to an extremely low level. The power consumption of the positive temperature coefficient thermistor 206 can be suppressed, and an extremely energy efficient motor starting device can be obtained.

  Furthermore, the paint-type heat insulating material 212 is simply applied in advance to the surface of the case 211, does not require the addition of new parts, and does not increase the number of assembly steps, thus obtaining a highly productive and inexpensive starting device. be able to.

(Embodiment 3)
FIG. 7 is a circuit diagram of a motor starting device according to the third embodiment of the present invention, FIG. 8 is an essential part assembly diagram of the motor starting device according to the third embodiment of the present invention, and FIG. 9 is an internal view of FIG. It is the D section enlarged view which shows the cross section of a structure.

  Hereinafter, the present embodiment will be described with reference to FIG. 7, FIG. 8, and FIG.

  In FIG. 7, a motor 302 constituting a single-phase induction motor includes a main winding 310 and an auxiliary winding 303 and is connected to an AC power supply 307.

  The starter 301 includes a first positive temperature coefficient thermistor 304 connected in series to the auxiliary winding 303 of the motor 302, a semiconductor switch 305 connected in series to the first positive temperature coefficient thermistor 304, and a first positive temperature coefficient thermistor. The second positive temperature coefficient thermistor 306 is connected to the auxiliary winding 303 of the motor 302 via the electrode plate A313 in parallel with 304 and the semiconductor switch 305.

  The first positive temperature coefficient thermistor 304 and the second positive temperature coefficient thermistor 306 self-heat when a current flows, and the electric resistance value rapidly increases.

  The semiconductor switch 305 has a first terminal T5, a second terminal T6, and a gate terminal G3, and the gate terminal G3 is connected to the second positive temperature coefficient thermistor 306 via the electrode plate B314.

  When a constant current flows through the gate terminal G3, the first terminal T5 and the second terminal T6 are turned on. When no current flows through the gate terminal G3, the first terminal T5 and the second terminal T6 are turned off. However, when no current flows through the second positive temperature coefficient thermistor 306, the resistance value of the second positive temperature coefficient thermistor 306 is small, so that a constant current flows through the gate terminal G3, and between the first terminal T5 and the second terminal T6. Is turned on.

  Further, when a current flows through the second positive characteristic thermistor 306, the resistance value of the second positive characteristic thermistor 306 increases and the current of the gate terminal G3 decreases, so that the first terminal T5 and the second terminal T6 are connected. It becomes OFF.

  FIG. 8 is an assembly diagram of a main part of a conventional motor starting device. In FIG. 9, which is an enlargement of D part, one surface electrode B 306 b of the electrode surfaces facing each other of the second positive temperature coefficient thermistor 306 is a case 311. The electrode plate B314 is connected to the gate terminal G3 of the semiconductor switch 305, and the electrode A306a on the other electrode surface is connected to the auxiliary winding 303 via the electrode plate A313. It is connected.

  The second positive characteristic thermistor 306 is included in the case 311, and the second positive characteristic thermistor 306 is sandwiched between the cases 311.

  The case 311 is provided with an air layer 312 defined by a closed space.

  The operation and action of the motor starting device configured as described above will be described below.

  When electricity is supplied from the AC power supply 307, a starting current flows through the main winding 310. At startup, the temperature of the second positive temperature coefficient thermistor 306 is low and the resistance value is small, so that a current flows through the gate terminal G3, so that the semiconductor switch 305 is turned on.

  Further, since the temperature of the first positive characteristic thermistor 304 is also low and the resistance value is small, a starting current flows through the auxiliary winding 303 and the motor 302 starts operation.

  After the motor 302 is started, the first positive temperature coefficient thermistor 304 self-heats above the Curie temperature in a few seconds, so that the electric resistance value increases rapidly, the current of the auxiliary winding 303 decreases, and the auxiliary winding 303 is substantially reduced. Is cut off.

  Further, since the power supply voltage is also applied to the second positive characteristic thermistor 306, self-heating occurs and the resistance value increases.

  In this embodiment, since the air layer 312 in the closed space is formed in the case 311, the heat of the second positive temperature coefficient thermistor 306 is hardly transmitted to the case 311, and the heat radiation to the outside is reduced. The second positive temperature coefficient thermistor 306 is maintained at a high temperature. For this reason, the resistance value increases, the current to the gate terminal G3 of the semiconductor switch 305 becomes very small, and the semiconductor switch 305 is turned OFF.

  When the semiconductor switch 305 is turned off, the application of the power supply voltage to the first positive temperature coefficient thermistor 304 is cut off, so that the power consumption of the first positive temperature coefficient thermistor 304 does not occur and power saving can be achieved.

  Therefore, the power consumption for the heat radiation to the case 311 other than the self-heating power of the second positive temperature coefficient thermistor 306 necessary for turning off the semiconductor switch 305 can be suppressed to a very low level. The power consumption of the positive temperature coefficient thermistor 306 can be suppressed, and an extremely energy efficient motor starting device can be obtained.

  Furthermore, since the case 311 is simply formed into a shape in which the air layer 312 in the closed space is formed, it is not necessary to add new parts, and the number of assembly steps is not increased. Can do.

(Embodiment 4)
FIG. 10 is a circuit diagram of a motor starting device according to Embodiment 4 of the present invention, FIG. 11 is an essential part assembly diagram of the motor starting device according to Embodiment 4 of the present invention, and FIG. 12 is an internal view of FIG. It is the E section enlarged view which shows the cross section of a structure.

Hereinafter, the present embodiment will be described based on FIG. 10, FIG. 11, and FIG.
In FIG. 10, a motor 402 constituting a single-phase induction motor includes a main winding 410 and an auxiliary winding 403, and is connected to an AC power supply 407.

  The starting device 401 includes a first positive temperature coefficient thermistor 404 connected in series to the auxiliary winding 403 of the motor 402, a semiconductor switch 405 connected in series to the first positive temperature coefficient thermistor 404, and a first positive temperature coefficient thermistor. A circuit is constituted by a second positive temperature coefficient thermistor 406 connected to the auxiliary winding 403 of the motor 402 via the electrode plate A 413 in parallel with 404 and the semiconductor switch 405.

  The first positive temperature coefficient thermistor 404 and the second positive temperature coefficient thermistor 406 self-heat when a current flows, and the electric resistance value rapidly increases.

  The semiconductor switch 405 has a first terminal T7, a second terminal T8, and a gate terminal G5, and the gate terminal G4 is connected to the second positive temperature coefficient thermistor 406 via the electrode plate B414.

  When a constant current flows through the gate terminal G5, the first terminal T7 and the second terminal T8 are turned on. When no current flows through the gate terminal G4, the first terminal T7 and the second terminal T8 are turned off. However, when no current flows through the second positive temperature coefficient thermistor 406, the resistance value of the second positive temperature coefficient thermistor 406 is small, so that a constant current flows through the gate terminal G4, and between the first terminal T7 and the second terminal T8. Is turned on.

  In addition, when a current flows through the second positive characteristic thermistor 406, the resistance value of the second positive characteristic thermistor 406 increases and the current at the gate terminal G5 decreases, so that the first terminal T7 and the second terminal T8 are connected. It becomes OFF.

  FIG. 11 is an assembly diagram of a main part of a conventional motor starting device. In FIG. 12, which is an enlargement of the E part, one surface electrode B 406 b of the opposing electrode surfaces of the second positive temperature coefficient thermistor 406 is a case 411 The electrode plate B414 is connected to the gate terminal G4 of the semiconductor switch 405, and the electrode A406a on the other electrode surface is connected to the auxiliary winding 403 via the electrode plate A413. It is connected.

  The second positive characteristic thermistor 406 is included in the case 411, and the second positive characteristic thermistor 406 is sandwiched between the cases 411.

  Case 411 is formed of foamed resin.

  The operation and action of the motor starting device configured as described above will be described below.

  When electricity is supplied from the AC power supply 407, a starting current flows through the main winding 410. At startup, the temperature of the second positive temperature coefficient thermistor 406 is low and the resistance value is small, so that a current flows through the gate terminal G4, so that the semiconductor switch 405 is turned on.

  Further, since the temperature of the first positive characteristic thermistor 404 is low and the resistance value is small, a starting current flows through the auxiliary winding 403 and the motor 402 starts operation.

  After the motor 402 is started, the first positive temperature coefficient thermistor 404 self-heats above the Curie temperature within a few seconds, so that the electric resistance value increases rapidly, the current of the auxiliary winding 403 decreases, and the auxiliary winding 403 is substantially reduced. Is cut off.

  Furthermore, since the power supply voltage is also applied to the second positive characteristic thermistor 406, it self-heats and the resistance value increases.

  In this embodiment, since the case 411 is formed of a foamed resin having excellent heat insulation, the heat of the second positive temperature coefficient thermistor 406 is hardly transmitted to the case 411, and heat radiation to the outside is reduced. The second positive temperature coefficient thermistor 406 is maintained at a high temperature. For this reason, the resistance value increases, the current to the gate terminal G4 of the semiconductor switch 405 becomes very small, and the semiconductor switch 405 is turned off.

  When the semiconductor switch 405 is turned off, the application of the power supply voltage to the first positive temperature coefficient thermistor 404 is cut off, so that the power consumption of the first positive temperature coefficient thermistor 404 does not occur and power can be saved.

  Therefore, the power consumption of the heat radiation to the case 411 other than the self-heating power of the second positive temperature coefficient thermistor 406 necessary for turning off the semiconductor switch 405 can be suppressed to a very low level. The power consumption of the positive temperature coefficient thermistor 406 can be suppressed, and an extremely energy efficient motor starting device can be obtained.

  Furthermore, since the molding of the case 411 is merely foamed resin molding, it is not necessary to add new parts, and the number of assembling steps is not increased. Therefore, a highly efficient and inexpensive starting device can be obtained.

(Embodiment 5)
FIG. 13 is a circuit diagram of a motor starting device according to Embodiment 5 of the present invention, FIG. 14 is an essential part assembly diagram of the motor starting device according to Embodiment 5 of the present invention, and FIG. 15 is an internal view of FIG. It is the F section enlarged view which shows the cross section of a structure.

  Hereinafter, the present embodiment will be described based on FIG. 13, FIG. 14, and FIG.

  In FIG. 13, a motor 502 constituting a single-phase induction motor includes a main winding 510 and an auxiliary winding 503 and is connected to an AC power source 507.

  The starting device 501 includes a first positive temperature coefficient thermistor 504 connected in series to the auxiliary winding 503 of the motor 502, a semiconductor switch 505 connected in series to the first positive temperature coefficient thermistor 504, and a first positive temperature coefficient thermistor. The second positive temperature coefficient thermistor 506 connected to the auxiliary winding 503 of the motor 502 via the electrode plate A513 in parallel with the semiconductor switch 504 and the semiconductor switch 505 is configured.

  The first positive temperature coefficient thermistor 504 and the second positive temperature coefficient thermistor 506 self-heat when current flows, and the electric resistance value rapidly increases.

  The semiconductor switch 505 has a first terminal T9, a second terminal T10, and a gate terminal G5, and the gate terminal G5 is connected to the second positive temperature coefficient thermistor 506 via the electrode plate B514.

  When a constant current flows through the gate terminal G5, the first terminal T9 and the second terminal T10 are turned on. When no current flows through the gate terminal G5, the first terminal T9 and the second terminal T10 are turned off. However, when the current does not flow through the second positive temperature coefficient thermistor 506, the resistance value of the second positive temperature coefficient thermistor 506 is small, so that a constant current flows through the gate terminal G5, and between the first terminal T9 and the second terminal T10. Is turned on.

  In addition, when a current flows through the second positive characteristic thermistor 506, the resistance value of the second positive characteristic thermistor 506 increases and the current of the gate terminal G5 decreases, so that the first terminal T9 and the second terminal T10 are not connected. It becomes OFF.

  FIG. 14 is an assembly diagram of a main part of a conventional motor starting device. In FIG. 15, which is an enlargement of F part, one surface electrode B 506 b of the opposite electrode surface of the second positive temperature coefficient thermistor 506 is a case 511. The electrode plate B514 is connected to the gate terminal G5 of the semiconductor switch 505, and the electrode A506a on the other electrode surface is connected to the auxiliary winding 503 via the electrode plate A513. It is connected.

  Further, the second positive characteristic thermistor 506 is included in the case 511, and the second positive characteristic thermistor 506 is sandwiched between the cases 511.

  A meta-aramid paper 512 is incorporated between the second positive temperature coefficient thermistor 506 and the case 511.

  The operation and action of the motor starting device configured as described above will be described below.

  When electricity is supplied from the AC power source 507, a starting current flows through the main winding 510. At startup, the temperature of the second positive temperature coefficient thermistor 506 is low and the resistance value is small, so that a current flows through the gate terminal G5, so that the semiconductor switch 505 is turned on.

  Further, since the temperature of the first positive characteristic thermistor 504 is also low and the resistance value is small, a starting current flows through the auxiliary winding 503 and the motor 502 starts operation.

  After the motor 502 is started, the first positive temperature coefficient thermistor 504 self-heats above the Curie temperature within a few seconds, so that the electric resistance value increases rapidly, the current of the auxiliary winding 503 decreases, and the auxiliary winding 503 is substantially reduced. Is cut off.

  Furthermore, since the power supply voltage is also applied to the second positive characteristic thermistor 506, it self-heats and the resistance value increases.

  In the present embodiment, the second positive temperature coefficient thermistor 506 and the case 511 are thermally insulated by the meta-aramid paper 512 that has excellent heat insulation and is easy to handle. Almost no heat is transmitted to the case 511, but heat radiation to the outside is reduced, and the second positive temperature coefficient thermistor 506 is maintained at a high temperature. For this reason, the resistance value increases, the current to the gate terminal G5 of the semiconductor switch 505 becomes very small, and the semiconductor switch 505 is turned OFF.

  When the semiconductor switch 505 is turned off, the application of the power supply voltage to the first positive characteristic thermistor 504 is cut off, so that the first positive characteristic thermistor 504 does not consume power and can save power.

  Therefore, the power consumption for the heat radiation to the case 511 other than the self-heating power of the second positive temperature coefficient thermistor 506 necessary for turning off the semiconductor switch 505 can be suppressed to a very low level. The power consumption of the positive temperature coefficient thermistor 506 can be suppressed, and an extremely energy efficient motor starting device can be obtained.

(Embodiment 6)
FIG. 16 is a circuit diagram of a motor starting device according to the sixth embodiment of the present invention, FIG. 17 is an essential part assembly diagram of the motor starting device according to the sixth embodiment of the present invention, and FIG. It is the G section enlarged view which shows the cross section of a structure.

  Hereinafter, the present embodiment will be described based on FIG. 16, FIG. 17, and FIG.

  In FIG. 16, a motor 602 constituting a single-phase induction motor includes a main winding 610 and an auxiliary winding 603 and is connected to an AC power supply 607.

  The starting device 601 includes a first positive temperature coefficient thermistor 604 connected in series to the auxiliary winding 603 of the motor 602, a semiconductor switch 605 connected in series to the first positive temperature coefficient thermistor 604, and a first positive temperature coefficient thermistor. A circuit is constituted by a second positive temperature coefficient thermistor 606 connected to the auxiliary winding 603 of the motor 602 via the electrode plate A613 in parallel with the reference numeral 604 and the semiconductor switch 605.

  The first positive temperature coefficient thermistor 604 and the second positive temperature coefficient thermistor 606 self-heat when a current flows, and the electric resistance value rapidly increases.

  The semiconductor switch 605 has a first terminal T11, a second terminal T12, and a gate terminal G6. The gate terminal G6 is connected to the second positive temperature coefficient thermistor 606 through an electrode plate B614.

  When a constant current flows through the gate terminal G6, the first terminal T11 and the second terminal T12 are turned on. When no current flows through the gate terminal G6, the first terminal T11 and the second terminal T12 are turned off. However, when no current flows through the second positive temperature coefficient thermistor 606, the resistance value of the second positive temperature coefficient thermistor 606 is small, so that a constant current flows through the gate terminal G6, and between the first terminal T11 and the second terminal T12. Is turned on.

  In addition, when a current flows through the second positive characteristic thermistor 606, the resistance value of the second positive characteristic thermistor 606 increases and the current at the gate terminal G6 decreases, so that there is a gap between the first terminal T11 and the second terminal T12. It becomes OFF.

  FIG. 17 is an assembly diagram of a main part of a conventional motor starting device. In FIG. 18, which is an enlargement of the G part, one surface electrode B 606 b of the opposing electrode surfaces of the second positive temperature coefficient thermistor 606 is a case 611. The electrode plate B614 is connected to the gate terminal G6 of the semiconductor switch 605, and the electrode A606a on the other electrode surface is connected to the auxiliary winding 603 via the electrode plate A613. It is connected.

  Further, the second positive characteristic thermistor 606 is included in the case 611, and the second positive characteristic thermistor 606 is sandwiched between the cases 611.

The case 611 is formed of a material having a thermal conductivity of 0.7 W / m · K or less. The operation and action of the motor starting device configured as described above will be described below.

  When electricity is supplied from the AC power supply 607, a starting current flows through the main winding 610. At startup, the temperature of the second positive temperature coefficient thermistor 606 is low and the resistance value is small, so that a current flows through the gate terminal G6, so that the semiconductor switch 605 is turned on.

  Further, since the temperature of the first positive characteristic thermistor 604 is low and the resistance value is small, a starting current flows through the auxiliary winding 603 and the motor 602 starts operation.

  After the motor 602 is started, the first positive temperature coefficient thermistor 604 self-heats above the Curie temperature within a few seconds, so that the electrical resistance value increases rapidly, the current of the auxiliary winding 603 decreases, and the auxiliary winding 603 is substantially reduced. Is cut off.

  Furthermore, since the power supply voltage is also applied to the second positive characteristic thermistor 606, self-heating occurs and the resistance value increases.

  In the present embodiment, the case 611 is formed of a material having a thermal conductivity of 0.7 W / m · K or less. Therefore, the heat of the second positive temperature coefficient thermistor 606 is hardly transmitted to the case 611 and goes to the outside. The heat dissipation is reduced, and the second positive temperature coefficient thermistor 606 is maintained at a high temperature. For this reason, the resistance value increases, the current to the gate terminal G6 of the semiconductor switch 605 becomes very small, and the semiconductor switch 605 is turned OFF.

  When the semiconductor switch 605 is turned off, the application of the power supply voltage to the first positive temperature coefficient thermistor 604 is cut off, so that the power consumption of the first positive temperature coefficient thermistor 604 does not occur and power saving can be achieved.

  Accordingly, the power consumption for the heat radiation to the case 611 other than the self-heating power of the second positive temperature coefficient thermistor 606 necessary for turning off the semiconductor switch 605 can be suppressed to an extremely low level. The power consumption of the positive temperature coefficient thermistor 606 can be suppressed, and an extremely energy efficient motor starting device can be obtained.

  Furthermore, since the molding of the case 611 is simply made of a material having a thermal conductivity of 0.7 W / m · K or less, it is not necessary to add new parts and the number of assembling steps is not increased. Can be obtained.

  As described above, since the motor starter according to the present invention can reduce the power consumption of the positive temperature coefficient thermistor, it can be used for applications such as motors such as refrigerators and air conditioners equipped with the positive temperature coefficient thermistor.

Circuit diagram of motor starter according to Embodiment 1 of the present invention Main part assembly drawing of motor starting device in same embodiment B part enlarged view of FIG. Circuit diagram of motor starter according to Embodiment 2 of the present invention Main part assembly drawing of motor starting device in same embodiment Part C enlarged view of FIG. Circuit diagram of motor starter according to Embodiment 3 of the present invention Main part assembly drawing of motor starting device in same embodiment Part D enlarged view of FIG. Circuit diagram of motor starter according to Embodiment 4 of the present invention Main part assembly drawing of motor starting device in same embodiment E section enlarged view of FIG. Circuit diagram of motor starting device in embodiment 5 of the present invention Main part assembly drawing of motor starting device in same embodiment F part enlarged view of FIG. Circuit diagram of motor starter according to Embodiment 6 of the present invention Main part assembly drawing of motor starting device in same embodiment G section enlarged view of FIG. Circuit diagram using conventional motor starter Main part assembly drawing of conventional motor starter Part A enlarged view of FIG.

Explanation of symbols

103, 203, 303, 403, 503, 603 Auxiliary winding 104, 204, 304, 404, 504, 604 First positive temperature coefficient thermistors 105, 205, 305, 405, 505, 605 Semiconductor switches 106, 206, 306, 406, 506, 606 Second positive temperature coefficient thermistor 110, 210, 310, 410, 510, 610 Main winding 111, 211, 311, 511 Case 112 Vacuum heat insulating material 212 Paint type heat insulating material 312 Air layer 411 With foam resin Formed case 512 Meta-aramid paper 611 Case formed of a material having a thermal conductivity of 0.7 W / m · k or less

Claims (7)

  A motor starter having a main winding and an auxiliary winding, wherein the first positive temperature coefficient thermistor is connected in series to the auxiliary winding, and the semiconductor switch is connected in series to the first positive temperature coefficient thermistor. A second positive temperature coefficient thermistor connected in parallel with the first positive temperature coefficient thermistor and the semiconductor switch to control on and off of the semiconductor switch, and a case containing the second positive temperature coefficient thermistor, The motor starter, wherein the second positive temperature coefficient thermistor is sandwiched between the cases and a heat insulating layer is provided on at least a part of the case.   2. The motor starting device according to claim 1, wherein the heat insulating layer is formed of a vacuum heat insulating material made of a core material and a non-breathable jacket material covering the core material.   2. The motor starting device according to claim 1, wherein the heat insulating layer is formed of a paint type heat insulating material applied to a surface of the case which is in contact with the second positive temperature coefficient thermistor.   The motor starter according to claim 1, wherein the heat insulating layer is formed of an air layer defined by a closed space.   The motor starter according to claim 1, wherein the heat insulating layer is formed of a foamed resin.   The motor starter according to claim 1, wherein the heat insulating layer is formed of meta-aramid paper.   The motor starter according to claim 1, wherein the heat insulating layer is formed of a material having a thermal conductivity of 0.7 W / m · k or less.

Images