JP3126895B2 - Single-phase induction motor and refrigerator using the single-phase induction motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling a single-phase induction motor used in a compressor such as a refrigerator.

[0002]

2. Description of the Related Art FIG.
FIG. 1 is a circuit diagram of a compressor driving device used for a conventional air conditioner or the like disclosed in Japanese Patent Application Publication No. H10-115,878. In the figure, 1 is a compressor (electric motor), 2 is a low-load capacitor, 3 is a high-load capacitor, 4 is a switch for switching between the low-load capacitor 2 and the high-load capacitor 3, and 5 is a starting relay, which is a compressor. The operation is performed only at the time of start-up of No. 1 to make the contact 5a conductive.

[0003] Next, the operation of the conventional compressor driving device is shown in FIG.
A description will be given using the torque curve and the capacitor terminal voltage curve. When the compressor 1 is started, the capacitor terminal voltage is relatively low, so that the contact 5a of the start relay 5 operates, and the starting torque increases because the capacitors 2 and 3 enter the auxiliary coil of the compressor 1 in parallel (FIG. 14 (torque curve when starting capacitor is used). Therefore, even if the load at the time of starting is large, the compressor 1 starts. Thereafter, when the rotation speed of the compressor 1 increases, the capacitor terminal voltage also increases, the contact 5a is disconnected, and only the operation capacitor is used, so that a steady operation is performed (the torque curve when the operation capacitor is used in FIG. 14).
At this time, when the load on the compressor 1 is light, the capacitor 2 is used as an operation capacitor, and the capacitor 3 is used as a startup capacitor at the time of starting. When the load is heavy, the condenser 3 is used for operation and the condenser 2 is used for start-up by using the changeover switch 4, so that the compressor can be driven with a large starting torque and with high operation efficiency.

[0004]

Since the conventional compressor driving device is constructed as described above, it has the following problems. (1) When the difference between the starting torque and the steady torque is large, the capacitor 2 is used as an operating capacitor and the capacitor 3 is used as a starting capacitor. However, there is a problem that the capacity of the capacitor No. 3 as an operation capacitor is too large and the efficiency is low. (2) In the same case, if the capacity of the capacitor 3 is too large, an error in the absolute value of the capacity becomes large, and it becomes difficult to operate the starting relay 5 stably. (3) Since the operating capacitors 2 and 3 are switched, a large current for charging the operating capacitor flows through the contact of the changeover switch 4 and an arc is generated, which shortens the contact life. In addition, it is expensive to strengthen the contacts.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. A single-phase induction motor and a refrigerator using the single-phase induction motor always perform contact connection for switching the capacity of a capacitor when the motor is stopped. The purpose is to obtain. Another object of the present invention is to obtain a single-phase induction motor that can start with a large starting torque by using all capacitors at the time of starting, and that can use an optimum capacitor depending on the load condition, and a refrigerator using the single-phase induction motor. I do. Furthermore, in the event of an abnormality such as a stall, the power supply is immediately cut off,
An object of the present invention is to provide a single-phase induction motor capable of generating a maximum starting torque by using all capacitors when starting up again, and a refrigerator using the single-phase induction motor.

[0006]

According to a first aspect of the present invention, there is provided a single-phase induction motor comprising: a main winding; an auxiliary winding provided at a position different in electrical angle from the main winding; and a constant connection to the auxiliary winding. The operation capacitor for continuous connection, the addition operation capacitor connected to the auxiliary winding according to the operation load, the relay that opens and closes the addition operation capacitor, and the power supply to the motor In the state of being cut off and stopped , electric
Performs a closing operation when it is determined that the machine starts start from OFF to ON before the power supply is energized is already powered
A control unit that controls so that the closing operation of further turning on from on after turning on the power supply is performed after the addition operation capacitor is connected to the auxiliary winding and the power is supplied and started and operated. It is provided with.

[0007] The single-phase induction motor according to the second aspect is the first aspect.
Starting relay on the auxiliary winding
Operation capacitor connected at all times
And for starting connected in parallel with the addition operation capacitor
It has a capacitor .

According to a third aspect of the present invention, in the single-phase induction motor according to the second aspect, the relay for opening and closing the adding operation capacitor is opened when the load of the motor is reduced after the motor is started. It is characterized by.

A single-phase induction motor according to a fourth aspect of the present invention is the single-phase induction motor according to the first aspect, wherein the operation motor for continuous connection is provided.
A second operating capacitor connected to the auxiliary winding via a relay as a summing operating capacitor, the second operating capacitor being connected to the auxiliary winding at all times as a sensor. The capacitor for use is used for addition when the motor has a high load.

According to a fifth aspect of the present invention, there is provided a single-phase induction motor comprising: a main winding;
An auxiliary winding provided at a position different in electrical angle from the main winding, an operation capacitor for continuous connection always connected to the auxiliary winding, and an addition capacitor connected to the auxiliary winding according to the operation load. An operation capacitor, a relay for opening and closing the addition operation capacitor, current detection means for detecting the current of the motor, and the current detection means detecting the motor stall despite power being supplied to the motor. Then, the power supply to the motor is cut off and the relay is opened, and at the time of the next start, when it is determined that the motor is to be started , a closing operation of turning on the relay from off prior to the power supply is performed before the power supply. Power supply after the addition operation capacitor is connected to the auxiliary winding.
And a control unit for controlling so as to supply and start up and operate,
It is provided with.

A refrigerator according to claim 6 is operated by a compressor driving device using the single-phase induction motor according to claim 1,
Refrigerator characterized in that all operating capacitors are connected when starting.

A refrigerator according to claim 7 is operated by a compressor drive device using a single-phase induction motor according to claim 3,
When the load on the compressor driving device is reduced, a relay for opening and closing the addition operation capacitor is opened.

The refrigerator according to claim 8 is operated by a compressor drive device using the single-phase induction motor according to claim 3,
When the temperature in the refrigerator or evaporator drops below a certain temperature
The relay for opening and closing the addition operation capacitor is opened.

A refrigerator according to a ninth aspect is operated by a compressor driving device using a single-phase induction motor according to the third aspect,
The time from the start of the relay for opening and closing the addition operation capacitor after the defrosting operation until the relay is opened is set to be longer than that in the normal operation.

According to a tenth aspect of the present invention, there is provided a refrigerator driven by a compressor driving device using a single-phase induction motor according to the fifth aspect, comprising means for detecting an abnormality of the current detecting means. Is characterized in that the stall determination of the compressor is not performed.

The refrigerator according to the eleventh aspect is operated by the compressor driving device using the single-phase induction motor according to the fifth aspect. When the compressor stalls continuously, the addition operation is performed each time. Means for setting the time from starting to opening of the relay for opening and closing the capacitor for stepwise to be gradually increased.

[0017]

According to the first aspect of the present invention, the single-phase induction motor controls the relay that opens and closes the operation capacitor only when the power supply to the motor is cut off and stopped.

According to a second aspect of the present invention, there is provided a single-phase induction motor in which a relay for opening and closing an operation capacitor connected in parallel with the operation capacitor is closed only when power supply to the motor is cut off and stopped. I do.

According to a third aspect of the present invention, the relay for opening and closing the operating capacitor is opened when the load becomes light after the motor is started.

In the single-phase induction motor according to the present invention, the second operating capacitor is used for addition when the motor has a high load.

In the single-phase induction motor according to the present invention, when the current detecting means detects a stall, the control section performs a control to cut off the power supply to the motor and to open the relay, and closes the relay while the motor is stopped. I do.

In the refrigerator according to the sixth aspect, the compressor driving device is started in a state where all the operation condensers are connected.

In the refrigerator of the present invention, the relay for opening and closing the operation condenser is opened when the load on the compressor driving device is reduced.

In the refrigerator according to the present invention, the relay for opening and closing the operation condenser is opened when the temperature of the evaporator becomes lower than a predetermined temperature in the refrigerator or the evaporator.

In the refrigerator according to the ninth aspect, the time from the start of the relay for opening and closing the operation capacitor after the defrosting operation to the opening thereof is longer than that in the normal operation.

In the refrigerator according to the present invention, the stall determination of the compressor is not performed when the current detecting means has an abnormality.

In the refrigerator according to the eleventh aspect, each time the compressor stalls continuously, the time from starting to opening of the relay for opening and closing the operation capacitor is set to be gradually longer each time.

[0028]

【Example】

Embodiment 1 FIG. Overview of Embodiment 1 In Embodiment 1, the starting method of the single-phase induction motor is 1
A case in which three starting capacitors and two operating capacitors are used will be described. The use of these three capacitors is controlled by a control unit. When the compressor is started, all three capacitors are used to increase the starting torque, and two operating capacitors are used according to the operating load of the compressor. Are used properly so as to increase the operation efficiency. In addition, the contact that opens and closes the operating capacitor, especially when the compressor is stopped, is closed when a large current flows or an arc is generated. . An example in which a compressor driving device using such a single-phase induction motor is applied to a refrigerator will be described.

The first embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a compressor containing an electric motor,
Reference numeral 5 denotes a PTC thermistor for connecting the starting capacitor 6 to the auxiliary winding of the compressor 1 only at the time of starting, and reference numeral 7 denotes a first corresponding to a steady-state load connected in parallel to a series circuit of the PTC thermistor 5 and the starting capacitor 6. The operation condenser 8 is added to the first operation condenser 7 in parallel with the first operation condenser 7 via the contact 4a of the relay 4 at the time of a high load. The second operation condenser 10 is a control unit for controlling the operation of the compressor 1. ,
Reference numeral 11 denotes a temperature sensor for detecting a temperature of a cooler (not shown), and reference numeral 12 denotes a relay for connecting a power supply to the compressor 1 to turn on / off a contact 12a. Reference numeral 13 denotes a discharge resistor for discharging the electric charge of the second operation capacitor 8 when the relay contact 4a is turned off.

FIG. 2 is a schematic view showing a cross section of the refrigerator and a control method when the compressor driving device of the present invention is used in a refrigerator. In FIG. Refrigeration room 102, a refrigeration room connected below the refrigeration room 101, 103 a fan for circulating cool air composed of blades and a motor, 104 adjusts the amount of cool air flowing into the refrigeration room 102. Damper thermometer driven by an electric motor which is means for controlling the temperature to an appropriate temperature
5 is a cooler (evaporator) provided in the freezing room 101, 10
Reference numeral 6 denotes a heater for melting and removing frost attached to the cooler 105. The compressor 1 is disposed below the main body 100, and a temperature sensor 11 for detecting the temperature of the cooler 105 is attached near the cooler 105.

Before describing the operation of the compressor driving device of FIG. 1, the operation of the refrigerator of FIG. 2 will be described first with reference to the schematic flowchart of FIG. The temperature data of each of the freezing room 101 and the refrigerator room 102 and the temperature data of the defrosting thermistor 11 are read (step 200). Next, it is determined that the defrosting is being performed. If the defrosting is being performed, the thermistor 1 for detecting the temperature of the cooler 105 is used.
Determine the end of the defrost by the temperature of 1 and determine the continuation or end,
The process proceeds to step 213 (steps 201 to 204). When the defrosting is not being performed, the operation stop of the compressor 1 is determined based on the temperature in the freezer 101. At this time, the freezing room 10
If the internal temperature of the compressor 1 is high, the compressor 1 and the fan motor 103 are operated to clear the start-up prevention timer TM for 10 minutes, and the compressor operation F is set to "1" (steps 205 to 208). When the temperature in the freezer compartment 101 is low, the compressor 1 and the fan motor 103 are stopped and the operation inhibition F is set to "1". Next, a 10-minute start prevention timer: TM is counted, and when 10 minutes have elapsed, "0" is set to the operation inhibition F (steps 209 to 212). Next, the electric motor drive type damper thermostat is operated based on the temperature in the refrigerator compartment 102 to keep the temperature at an appropriate level (steps 213 to 215). The refrigerator is controlled by repeating the above control.

The operation of the compressor driving device will be described with reference to the schematic flowchart of FIG. First, when the compressor 1 is started, the current state of the compressor 1 is stopped with the compressor 1 operation flag F = 0, and if there is an operation request, it is determined whether or not operation is possible. Compressor 1 by connecting relay contact 4a
The operation flag F = 1, and after counting 1 second, step 27
Go to (Steps 21 to 25). In step 21, if the operation flag F of the compressor 1 is 1, the process proceeds to step 26, and if there is an operation request, the process proceeds to step 27 to connect the relay contact 12a to supply power to the compressor 1. At this time, the starting capacitor 6 is connected to the auxiliary winding of the compressor 1.
And the operating capacitors 7 and 8 are connected in parallel, so that the starting torque increases. Therefore, even if the load at the time of starting is large, the compressor 1 starts. At the same time, when the current also flows through the PTC thermistor 5 and reaches the Curie temperature, the resistance becomes infinite, and the starting capacitor 6 is electrically separated from the auxiliary winding. Next, in step 28, the time from the start of the compressor 1 is counted.
The relay contact 4a is opened when T1 (2 minutes) is longer than T2 due to the large load of T2.
The compressor 1 is operated only by the operation condenser 7 (steps 29 to 33).

If there is no operation request in step 26, the relay contact 12a is turned off in step 34, the operation flag F of the compressor 1 is set to 0, and after counting 1 second (step 35), the relay contact 12 Turn off 4a. The reason why the relay contact 4a is turned off is to prevent useless power consumption of the relay coil unit 4. Further, the relay contact 12a is provided before the relay contact 4a.
Is turned off because the problem of the contact trouble is less when the relay contacts 4a are opened after the capacitors 7 and 8 are discharged and the electric charge is lost. However, as shown in the schematic flowchart of FIG. 5, the order of steps 34 and 36 may be reversed, and the relay contact 4a may be turned off first.

As described above, according to this embodiment, by controlling the torque curve of the compressor 1 according to the operation state of the refrigerator, the compressor can be driven with a large starting torque and high operating efficiency. The relay contact 4a is turned on only when the compressor 1 is stopped, and is not turned on when the compressor 1 is connected to the power supply, that is, when the capacitor 7 is charged. No large current flows and no arcing occurs.

Embodiment 2 FIG. Embodiment 2 Although the basic operation has been described in the first embodiment, in the second embodiment, when the compressor is stopped due to stall for some reason, this is detected immediately, the power of the compressor is turned off, and the operation request is made again. In case of starting, there is a function to connect all capacitors to start with the maximum starting torque.

Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. In FIG. 6, reference numeral 9 denotes a current detector (hereinafter referred to as CT) for detecting a current flowing through the compressor 1;
Protection device. The other configuration is exactly the same as that of FIG. 1 and the description thereof is omitted.

Next, the operation will be described. In the CT 9, an output voltage as shown in FIG. 9 is generated by the current flowing through the compressor 1, and the control unit 10 stores the state of the compressor in operation / stall / stop / disconnection. In the schematic flowchart of FIG. 7, it is determined whether or not the state of the compressor 1 during operation of the compressor 1 in which the relay contact 12a is closed in step 37 is abnormal based on the current detected by CT9.
8 and determine if it is a stall.
2a is turned off, the operation flag F of the compressor 1 is set to 0, and after counting 1 second, the relay contact 4a is turned off (steps 34 to 34).
36). If it is not stall in step 38, the relay contact 12a is closed, so that somewhere in the circuit including the compressor 1 is disconnected, and the disconnection flag F is set in step 39.
= 1 and then go to steps 34 to 36 to
Power supply to the power supply.

In FIG. 7, the relay contact 12a is turned off in steps 34 to 36, and then the relay contact 4a is turned off for the reason described in the first embodiment. However, as shown in FIG. You can reverse it.

As described above, according to the second embodiment, when the compressor 1 is stalled for some reason during operation, the control unit 10 determines that the compressor 1 is stalled based on the current detected by the CT 9 and determines that the compressor 1 is stalled.
And the relay contact 4a is opened at the time of the next start, and the relay contact 4a is closed again under the control of the control unit 10 at the next start, and in a state where all the capacitors are connected,
That is, the engine can be started with a large starting torque. If such control is not performed, when the compressor 1 stalls, the protection device 14 operates to cut off the power supply to the compressor.
When the protection device 14 is restored, the relay contact 4a remains open, so that the starting capacitor 6 and the first operating capacitor 7 are started, and a problem that the starting torque is not sufficient occurs.

Embodiment 3 FIG. In the above-described embodiment, the case where the current detector CT9 is used has been described. However, the operating state of the compressor 1 may be detected using a shunt resistor, a vibration sensor, and the like, and the compressor 1 may be classified by the control unit 10. The same effect as the example is achieved.

Embodiment 4 FIG. Further, in the above-described embodiment, the description has been given of the case where the operation of the operation capacitors 7 and 8 at the time of high load and at the time of low load are simply performed by time. However, as shown in the flowchart of FIG. Vessel 105
By opening the relay contact 4a when the temperature detected by the temperature sensor 11 is equal to or lower than the temperature A for one hour (steps 40 to 45), the same effect as in the above embodiment can be obtained even at the time of installation.

Embodiment 5 FIG. If the current detector fails,
Determining stall when a current detector failure is detected to determine that the compressor has not stalled and to avoid losing power to the compressor by determining stall. The refrigerator is cooled by continuing to supply power to the compressor and the like until there is no more operation request for the compressor.

Hereinafter, a fifth embodiment of the present invention will be described with reference to the block diagram of FIG. 6 and the flowchart of FIG. First, at step 50, the CT 9 is always detected for failure. In the failure detection of the CT 9, when the control unit 10 receives an ON signal at the time of OFF where no current should flow, it is determined as a failure. If it is determined in step 21 that the operation flag F of the compressor 1 is stopped, the process proceeds to step 22, and if there is an operation request, the relay contact 4a is turned on and the operation flag F of the compressor 1 is set to 1 in step 24, and 1 After a lapse of seconds (step 25), the relay contact 12a is connected to supply power to the compressor 1 (step 2).
7). If it is determined in step 21 that the compressor 1 is operating with the operation flag F = 1, the process proceeds to step 26, and if there is an operation request,
Proceeding to step 51, if the CT 9 is faulty, a normal stall determination cannot be made, and there is no longer any request for operation of the compressor 1, so supply of power to the compressor 1 and the internal fan is continued. In step 51, if CT9 has not failed,
At step 52, the stall is detected. At step 53, if the stall is detected, the relay contact 12a is turned off, the compressor 1 operation flag F is set to 0, and after counting for 1 second, the relay contact 4a is turned off and the compressor 1 is turned off. The supply of power is stopped (steps 34 to 36). If a failure of the CT 9 is detected in step 51, a failure display may be performed. Even if the power supply to the compressor 1 is continued after the compressor 1 has actually stalled, the failure is displayed. It can be seen that this is not CT1 but CT9.

According to this embodiment, the failure of the current detecting portion can be detected, and if the failure is detected, the stall is not determined and the compressor 1 or the like is operated until the operation request of the compressor 1 is eliminated. By continuing to supply the power supply and cooling the inside of the refrigerator, the operation stop of the refrigerator due to the failure of the current detector 9 can be eliminated.

Embodiment 6 FIG. Hereinafter, a sixth embodiment of the present invention will be described with reference to the flowchart of FIG. If the compressor 1 is stalled while power is supplied to the compressor 1 with the operation flag F = 1 in Step 21, the power supply to the compressor 1 is temporarily stopped and the number of continuous stalls is set to once (Step 21). 54). 1
After 0 minutes, if the power supply is restarted and the motor stops again, the power supply to the compressor 1 is stopped and the number of continuous stalls becomes two (step 5).
5). At this time, it is determined that the load is high. Therefore, the high torque operation time at the time of starting the next compressor 1 after 10 minutes is extended by 30 minutes. As stalls continue and the number of consecutive stalls increases,
After the 10-minute stop, the high-torque operation time at the start of the compressor 1 is extended by 30 minutes up to a maximum of 2 hours (step 56).
When the operation of the compressor 1 ends normally, the number of continuous stalls is reset, and the high torque operation time at the next start of the compressor 1 returns to normal (steps 57 and 58).

According to this embodiment, when the number of continuous stalls is two or more, each time the number of continuous stalls is increased, the high torque operation time at the time of starting the compressor 1 after stopping for 10 minutes is reduced to 3 hours at the maximum.
Since the extension is performed every 0 minutes, it is possible to prevent the compressor 1 from continuously stalling at startup.

[0047]

According to the first aspect of the present invention, there is provided a single-phase induction motor having a main winding, an auxiliary winding provided at a position having an electrical angle different from that of the main winding, and a constant connection always connected to the auxiliary winding. Operation capacitor, an addition operation capacitor connected to the auxiliary winding according to the operation load, a relay that opens and closes the addition operation capacitor, and a power supply to the motor that cuts off this relay and stops While the motor is running ,
Performs a closing operation to turn from off before the power supply when the determined already Separate the closing operation to turn from further <br/> off after being supplied with power current, for summing After the operating capacitor is connected to the auxiliary winding ,
The control unit controls the power supply so that it can be started and operated.Therefore, a large current does not flow through the contacts of the relay that opens and closes the operation capacitor, no arc is generated, and the start-up is performed. A single-phase induction motor with large torque and good operation efficiency can be obtained.

[0048] The single-phase induction motor according to claim 2 is characterized in that :
Starting relay on the auxiliary winding
Operation capacitor connected at all times
And for starting connected in parallel with the addition operation capacitor
With a configuration equipped with a capacitor , it is possible to obtain a single-phase induction motor that has a larger starting torque and higher operating efficiency without causing a large current to flow through the contacts of the relay that opens and closes the operating capacitor and without arcing. .

According to a third aspect of the present invention, in the single-phase induction motor according to the second aspect, the relay for opening and closing the addition operation capacitor is opened when the load becomes light after the motor is started. As a result, a single-phase induction motor with always high operating efficiency can be obtained.

A single-phase induction motor according to a fourth aspect of the present invention is the single-phase induction motor according to the first aspect, wherein the operation capacitor for continuous connection is provided.
A second operating capacitor connected to the auxiliary winding via a relay as a summing operating capacitor, the second operating capacitor being connected to the auxiliary winding at all times as a sensor. Since the capacitor for use is used for addition when the motor has a high load, a single-phase induction motor with good operation efficiency can be obtained regardless of whether the load is high or low.

According to a fifth aspect of the present invention, there is provided a single-phase induction motor comprising: a main winding;
An auxiliary winding provided at a position different in electrical angle from the main winding, an operation capacitor for continuous connection always connected to the auxiliary winding, and an addition capacitor connected to the auxiliary winding according to the operation load. An operation capacitor, a relay for opening and closing the addition operation capacitor, current detection means for detecting the current of the motor, and the current detection means detecting the motor stall despite power being supplied to the motor. Then, the power supply to the motor is cut off and the relay is opened, and at the time of the next start, when it is determined that the motor is to be started , a closing operation of turning on the relay from off prior to the power supply is performed before the power supply. Power supply after the addition operation capacitor is connected to the auxiliary winding.
And a control unit for controlling so as to supply and start up and operate,
With this configuration, it is possible to start with the maximum starting torque even when restarting after a stall.

A refrigerator according to a sixth aspect is operated by a compressor driving device using the single-phase induction motor according to the first aspect,
When starting, all the operation capacitors are connected, so that starting can be performed with the maximum starting torque.

The refrigerator according to claim 7 is operated by a compressor driving device using the single-phase induction motor according to claim 3,
When the load on the compressor driving device is reduced, the relay that opens and closes the addition operation capacitor is opened, so that a refrigerator with always high operation efficiency can be obtained.

The refrigerator according to claim 8 is operated by a compressor drive device using a single-phase induction motor according to claim 3,
When the temperature in the refrigerator or evaporator drops below a certain temperature
Since the relay that opens and closes the addition operation capacitor is opened, a refrigerator with always high operation efficiency can be obtained.

A refrigerator according to a ninth aspect is operated by a compressor driving device using the single-phase induction motor according to the third aspect,
Since the time from the start of the relay for opening and closing the addition operation capacitor to the opening after the defrosting operation until the relay is opened is longer than in the case of the normal operation, a refrigerator with always high operation efficiency can be obtained.

A refrigerator according to a tenth aspect is operated by a compressor driving device using a single-phase induction motor according to the fifth aspect, and includes means for detecting an abnormality in the current detecting means. Is configured not to determine the stall of the compressor, so that it is possible to avoid unnecessary stoppage of the power supply to the compressor when the current detecting means fails.

The refrigerator according to the eleventh aspect is operated by the compressor driving device using the single-phase induction motor according to the fifth aspect. When the compressor stalls continuously, the addition operation is performed each time. Since the means for setting the time from start to release of the relay that opens and closes the condenser for use in a stepwise manner is provided, repetition of stall at the time of starting the compressor can be prevented.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a single-phase induction motor according to Embodiment 1 of the present invention.

FIG. 2 is a longitudinal sectional view of a refrigerator to which the single-phase induction motor according to the first embodiment of the present invention is applied.

FIG. 3 is a flowchart illustrating control of the refrigerator according to the first embodiment of the present invention.

FIG. 4 is a flowchart illustrating control of the refrigerator according to the first embodiment of the present invention.

FIG. 5 is a flowchart illustrating control of the refrigerator according to the first embodiment of the present invention.

FIG. 6 is a circuit diagram of a single-phase induction motor according to Embodiment 2 of the present invention.

FIG. 7 is a flowchart illustrating control of a refrigerator according to Embodiment 2 of the present invention.

FIG. 8 is a flowchart illustrating control of a refrigerator according to a second embodiment of the present invention.

FIG. 9 is a diagram showing an output voltage of a current detector according to Embodiment 2 of the present invention.

FIG. 10 is a flowchart illustrating control of a refrigerator according to a second embodiment of the present invention.

FIG. 11 is a flowchart illustrating control of a refrigerator according to Embodiment 5 of the present invention.

FIG. 12 is a flowchart illustrating control of a refrigerator according to Embodiment 6 of the present invention.

FIG. 13 is a circuit diagram of a conventional compressor driving device.

FIG. 14 is a diagram showing characteristics of a conventional single-phase induction motor.

[Explanation of symbols]

1 compressor (motor), 4 relays, 4a contacts, 5
PTC thermistor, 6 starting capacitor, 7 first operating capacitor, 8 second operating capacitor, 9 current detector, 10 control unit, 12a contact.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Kunihiko Yagi 3-18-1, Oka, Shizuoka-shi Mitsubishi Electric Corporation Shizuoka Works (72) Inventor Susumu Kawaguchi 3-181-1, Oka, Shizuoka-shi Mitsubishi Electric Corporation Inside Shizuoka Works (72) Inventor Tetsuya Mochizuki 3-18-1, Oka, Shizuoka-shi Mitsubishi Electric Corporation Inside Shizuoka Works (72) Inventor Yasuhiro Yoshino 3-181-1, Oka, Shizuoka-shi Mitsubishi Electric Corporation Inside Shizuoka Works (72) Inventor Takenori Adachi 3-181-1, Oka, Shizuoka-shi Mitsubishi Electric Corporation Shizuoka Works (72) Inventor Nobuyoshi Haragawa 3-181-1, Oka, Shizuoka-shi Mitsubishi Electric Shizuoka In the factory (56) References JP-A-52-54106 (JP, A)

Claims (11)

(57) [Claims] 1. A main winding, an auxiliary winding provided at a position having an electrical angle different from that of the main winding, an operation capacitor for continuous connection always connected to the auxiliary winding, An addition operation capacitor connected to the auxiliary winding, and a relay that opens and closes the addition operation capacitor,
When the power supply to the motor is cut off and the motor is stopped , the power
Ri destination performs the closing operation to turn from off already is not performed closing operation to turn on the further off after being supplied with power conduction, the previous SL operation capacitor for adding said auxiliary winding And a control unit for supplying power after being connected to the control unit and performing control such that the motor is started and operated. 2. A starting capacitor connected to the auxiliary winding via a starting relay and having a starting capacitor connected in parallel to the constant-operation capacitor and the addition-operation capacitor. The single-phase induction motor according to claim 1. 3. The single-phase induction motor according to claim 2, wherein the relay that opens and closes the addition operation capacitor is opened when the load is reduced after the start of the motor. 4. A first operating capacitor which is constantly connected to the auxiliary winding as the always-connected operating capacitor, and a second operating capacitor which is connected to the auxiliary winding via a relay as an adding operating capacitor. The single-phase induction motor according to claim 1, further comprising: a second operation capacitor, wherein the second operation capacitor is used for addition when the motor has a high load. 5. A main winding, an auxiliary winding provided at a position having an electrical angle different from that of the main winding, an operation capacitor for continuous connection always connected to the auxiliary winding, An addition operation capacitor connected to the auxiliary winding, and a relay that opens and closes the addition operation capacitor,
Current detection means for detecting the current of the motor, and when the current detection means detects the stall of the motor despite the power being supplied to the motor, cuts off the power supply to the motor and opens the relay, Motor starts at next start
Start a first earlier than the power supply at the time of the determination performed closing operation to turn on the relay from OFF later subjected power the adding operation capacitor is connected to the auxiliary winding
A single-phase induction motor, comprising: a control unit that controls so as to be supplied and started / operated. 6. A refrigerator driven by a compressor drive device using a single-phase induction motor according to claim 1, wherein all the operation capacitors are connected when starting. 7. A relay that is operated by a compressor drive device using the single-phase induction motor according to claim 3 and that opens and closes an addition operation capacitor when the load on the compressor drive device is reduced. Refrigerator. 8. A relay which is operated by a compressor drive device using a single-phase induction motor according to claim 3 and opens and closes an addition operation capacitor when the temperature of the interior or the evaporator becomes lower than a certain temperature. A refrigerator characterized by being opened. 9. A time period from the start of the relay for opening and closing the operation addition capacitor after the defrosting operation to the opening of the relay, which is operated by the compressor driving device using the single-phase induction motor according to claim 3, is usually equal to A refrigerator characterized by being longer than in operation. 10. A compressor driven by a compressor using the single-phase induction motor according to claim 5, further comprising means for detecting an abnormality of the current detecting means. A refrigerator characterized by not performing stall determination. 11. A relay that is operated by the compressor drive device using the single-phase induction motor according to claim 5 and that opens and closes the operation capacitor for each time of the compressor whenever the compressor stalls continuously. A refrigerator comprising means for setting the time from opening to opening gradually longer.