JPH09117188A - Refrigerating cycle device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of starting failures of a refrigerating cycle cooler by detecting the load torque of a DC motor at the time of starting the cooler from the outlet and inlet temperatures of the cooler and the difference between the outlet and inlet temperatures and starting the cooler in the starting sequence pattern corresponding to the load torque from the beginning. SOLUTION: An outlet temperature detecting means 26 for cooler detects the outlet temperature of a cooler in a refrigerating cycle 25. A torque-up means A 18 compares the outlet temperature of the cooler detected by the means 26 when the cooler is started with a preset reference outlet temperature of the cooler and, when the detected temperature is higher than the reference temperature, the means A 18 selects a starting sequence pattern having the high output torque corresponding to the temperature and outputs the pattern to a starting sequence control means 13. At the restarting time, the means 26 selects a starting sequence pattern having an output torque which is one-rank higher than the pattern selected at the time of starting the cooler and outputs the pattern to the means 13. Therefore, the influence of the starting failure of the cooler which occurs when the load torque becomes higher at the starting time by a high ambient temperature can be reduced further.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigeration cycle apparatus comprising an electric control unit for a compressor and a refrigeration cycle, and more particularly, to a sensorless system for detecting a rotor magnetic pole position of a DC brushless electric motor whose rotation speed is controlled by an inverter. The present invention relates to a method for activating an electric control device for a compressor performed in (1).

[0002]

2. Description of the Related Art In a starting method of an electric control device for a compressor, a rotor magnetic pole position of a DC brushless electric motor whose rotation speed is controlled by an inverter is detected in a sensorless manner using an induced voltage of an armature winding. Since no induced voltage is generated, position detection by the sensorless method cannot be performed.

For this reason, it is common practice to start up to a certain number of rotations at which position detection is possible, in accordance with a predetermined startup sequence pattern, and then switch to the sensorless system.

A method for starting such a conventional electric control device for a compressor is disclosed, for example, in Japanese Patent Laid-Open Publication No. HEI 1-454960.

This feature is intended to prevent the switching to the sensorless system from becoming unstable because the DC transient DC component of the filter circuit used in the sensorless circuit is not sufficiently attenuated when the DC motor is started, and to prevent the switching from failing. This is to switch to the sensorless system after the transient DC component has sufficiently attenuated, and to enable an electric control device for a compressor without starting failure.

[0006]

However, in the above configuration, since there is only one kind of start sequence pattern, when the load torque of the DC motor at the time of start is large,
Before switching to the sensorless method, there was a problem that the compressor was locked during the startup sequence pattern operation and startup failed.

In view of the above problems, the present invention detects the load torque of the DC motor at the time of start-up based on the refrigerating cycle cooler outlet temperature, the cooler inlet temperature, and the cooler inlet-cooler outlet temperature difference, and determines the load torque from the beginning. By activating the refrigeration cycle device according to the activating sequence pattern, a refrigeration cycle apparatus with few activation failures can be realized.

[0008]

In order to achieve this object, a refrigeration cycle apparatus according to the present invention comprises: an inverter circuit in which a plurality of semiconductor switches and diodes are bridge-connected; a DC motor operated by the inverter circuit;
A compressor driven by the DC motor, a condenser constituting a refrigeration cycle including the compressor, a cooler, a position detection unit for detecting a position of a rotor of the DC motor, and a position detection unit. A commutation unit that outputs a commutation pulse that determines an operation of the semiconductor switch of the inverter circuit based on an output; a rotation speed detection unit that detects a rotation speed of the compressor based on an output of the position detection unit; Lock detection means for detecting the lock state of the compressor based on the output of the rotation speed detection means, and chopping signal generation means for generating a chopping signal for performing chopping for varying the rotation speed of the DC motor, Combining means for combining the commutation pulse and the chopping signal; and a switch for turning on / off a semiconductor switch of the inverter circuit by an output of the combining means. Since the output of the position detecting means is not obtained at the time of starting the Eve means and the DC motor, the commutating pulse and the chopping signal which are determined in advance are output to the synthesizing means, and the lock detecting means controls the compressor. When a lock is detected, a start sequence control means for restarting to output a commutation pulse and a chopping signal again after a fixed time, and a start sequence pattern of the commutation pulse and the chopping signal output by the start sequence control means. And a plurality of startup sequence pattern storage means having different output torques of the startup sequence patterns stored therein, and a cooler outlet temperature detection means for detecting a cooler outlet temperature of the refrigeration cycle. , The cooler outlet temperature detected by the cooler outlet temperature detecting means at startup and If the cooler outlet temperature is high, the start sequence pattern with a large output torque is selected according to the temperature when the cooler outlet temperature is set high, and at the time of restart, the start step with a larger output torque Torque increasing means A for selecting a sequence pattern and outputting it to the starting sequence control means
And an operation mode switching unit that connects the startup sequence control unit and the synthesizing unit at the time of startup, and connects the commutation unit and the chopping signal generating unit to the synthesizing unit after the startup. .

Also, an inverter circuit in which a plurality of semiconductor switches and diodes are bridge-connected, a DC motor operated by the inverter circuit, a compressor driven by the DC motor, and a refrigeration cycle including the compressor are configured. A condenser, a cooler, position detecting means for detecting a position of a rotor of the DC motor, and a commutation pulse for determining an operation of a semiconductor switch of the inverter circuit based on an output of the position detecting means. Commutation means, a rotation number detection means for detecting a rotation number of the compressor based on an output of the position detection means, and a lock for detecting a locked state of the compressor based on an output of the rotation number detection means. Detecting means, chopping signal generating means for generating a chopping signal for performing chopping to make the rotation speed of the DC motor variable, A synthesizing means for synthesizing the commutation pulse and the chopping signal, a driving means for turning on / off a semiconductor switch of the inverter circuit by an output of the synthesizing means, and an output of the position detecting means when the DC motor is started. Therefore, a commutation pulse and a chopping signal that are determined in advance are output to the synthesizing unit, and when the lock detecting unit detects the lock of the compressor, the commutation pulse and the chopping signal are re-established after a certain period of time. The starting sequence control means for performing restart to output, the starting sequence pattern of the commutation pulse and the chopping signal output by the starting sequence control means are stored, and the output torque of the starting sequence pattern stored in each is stored. A plurality of starting sequence pattern storage means different from each other, Serial and condenser inlet temperature detecting means for detecting a condenser inlet temperature, the condenser inlet temperature detecting means is compared with the cooling inlet reference temperature set in advance between the detected condenser inlet temperature at startup,
When the cooler inlet temperature is high, a start sequence pattern with a large output torque corresponding to the temperature is selected, and when restarting, a start sequence pattern with a larger one-step output torque is selected and output to the start sequence control means. Up means B, and an operation mode switching means for connecting the startup sequence control means and the synthesizing means at the time of startup, and for connecting the commutation means and the chopping signal generating means to the synthesizing means after the startup. It is a thing.

Also, an inverter circuit in which a plurality of semiconductor switches and diodes are bridge-connected, a DC motor operated by the inverter circuit, a compressor driven by the DC motor, and a refrigeration cycle including the compressor are configured. A condenser, a cooler, position detecting means for detecting a position of a rotor of the DC motor, and a commutation pulse for determining an operation of a semiconductor switch of the inverter circuit based on an output of the position detecting means. Commutation means, a rotation number detection means for detecting a rotation number of the compressor based on an output of the position detection means, and a lock for detecting a locked state of the compressor based on an output of the rotation number detection means. Detecting means, chopping signal generating means for generating a chopping signal for performing chopping to make the rotation speed of the DC motor variable, A synthesizing means for synthesizing the commutation pulse and the chopping signal, a driving means for turning on / off a semiconductor switch of the inverter circuit by an output of the synthesizing means, and an output of the position detecting means when the DC motor is started. Therefore, a commutation pulse and a chopping signal that are determined in advance are output to the synthesizing unit, and when the lock detecting unit detects the lock of the compressor, the commutation pulse and the chopping signal are re-established after a certain period of time. The starting sequence control means for performing restart to output, the starting sequence pattern of the commutation pulse and the chopping signal output by the starting sequence control means are stored, and the output torque of the starting sequence pattern stored in each is stored. A plurality of starting sequence pattern storage means different from each other, The cooler outlet temperature detecting means for detecting the cooler outlet temperature of the compressor, the cooler inlet temperature detecting means for detecting the cooler inlet temperature of the compressor, and the cooler inlet temperature detecting means at startup are detected. Cooler inlet-cooler outlet temperature difference, which is the temperature difference between the cooler inlet temperature and the cooler outlet temperature detected by the cooler outlet temperature detection means, and a preset reference cooler inlet-cooler outlet If the temperature difference between the cooler inlet and the cooler outlet is high, the startup sequence pattern with a large output torque is selected according to the difference in the cooler inlet temperature and the cooler outlet temperature. The torque increasing means C for selecting a start sequence pattern having a large step output torque and outputting it to the start sequence control means is connected to the start sequence control means and the combining means at the time of start. After the start, the commutation means and the chopping signal generation means are connected to the synthesizing means and the operation mode switching means is provided.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention has
The torque increasing means A estimates the load torque of the DC motor 4 at the time of startup from the cooler outlet temperature of the refrigeration cycle, and selects a start sequence pattern according to the load torque from the beginning, so that the cooler outlet temperature is high. Therefore, it is possible to realize a refrigeration cycle apparatus that reduces the influence of startup failure when the load torque at startup is large. Further, according to the present invention, the torque increasing means B has the structure described above.
However, by estimating the load torque of the DC motor at start-up from the cooler inlet temperature and selecting the start-up sequence pattern according to the load torque from the beginning, the initial pull-down of the refrigeration cycle (when freezing is first started)
It is possible to realize a refrigeration cycle apparatus that reduces the influence of startup failure when the load torque at startup such as after defrosting the cooler is large. Further, the present invention has the above-mentioned configuration.
The torque increasing means C directly detects the load torque of the DC motor at the time of start-up based on the temperature difference between the cooler inlet and the cooler outlet, and starts the start-up sequence pattern according to the load torque from the beginning, so that the load torque It is possible to realize a refrigeration cycle apparatus that further reduces the influence of startup failure when the value is large.

A refrigeration cycle apparatus according to Embodiment 1 of the present invention will be described below with reference to the drawings.

FIG. 1 is an overall configuration diagram of a refrigeration cycle apparatus according to Embodiment 1 of the present invention. In FIG. 1, reference numeral 1 denotes an AC power supply. Reference numeral 2 denotes a voltage doubler rectifier circuit for converting an AC voltage of the AC power supply 1 into a DC voltage, and has a configuration in which diodes 2a to 2d and capacitors 2e to 2f are connected.

Reference numeral 3 denotes an inverter circuit, in which semiconductor switches (transistors) 3a to 3f are connected in a three-phase bridge, and diodes 3g to 3l are connected to the respective transistors in parallel and in opposite directions. Reference numeral 4 denotes a DC motor, which is driven by the output of the inverter circuit 3. A compressor 5 is driven by the DC motor 4.

Reference numeral 6 denotes a position detecting means for detecting a rotational position of a rotor (not shown) of the DC motor 4 and generating a rotation pulse. The position detecting means 6 detects a position from a back electromotive voltage of the DC motor 4. It is.

Reference numeral 7 denotes commutation means for generating commutation pulses for commutating the semiconductor switches 3a to 3f of the inverter circuit 3 from the output of the position detection means 6. Numeral 8 denotes a rotation speed command means, which outputs a rotation speed command signal of the DC motor 4. Reference numeral 9 denotes a rotation number detecting means for counting the rotation pulses of the position detecting means 6 for a certain period (for example, 0.5 seconds).

Numeral 10 denotes a duty setting means. The duty value is set such that the two are set to coincide with each other based on the difference between the rotation speed command signal of the rotation speed commanding means 8 and the actual rotation speed detected by the rotation speed detecting means 9. Is output. Reference numeral 11 denotes a chopping signal generating means for generating a waveform having a constant frequency and a different on / off ratio in accordance with the duty value in order to make the rotation speed of the DC motor 4 variable.

Reference numeral 12 denotes a sensorless operation unit, which includes the position detection means 6, the commutation means 7, the rotation speed command means 8,
The rotation speed detecting means 9, the duty setting means 10,
And the chopping signal generating means 11.

Reference numeral 13 denotes a start-up sequence control means, which outputs a predetermined commutation pulse and a chopping signal since the output of the position detection means 6 cannot be obtained when the DC motor 4 is started, and will be described later. When the lock detecting means 17 detects the lock of the compressor 5, restart after a certain period of time to output the commutation signal and the chopping signal again.

Reference numerals 14, 15, and 16 denote start sequence pattern storage means A, start sequence pattern storage means B, and start sequence pattern storage means C, respectively. The commutation pulse and the chopping signal output by the start sequence control means are respectively provided. , A start sequence pattern A, a start sequence pattern B, and a start sequence pattern C.

FIGS. 2, 3 and 4 show the start sequence pattern A, the start sequence pattern B and the start sequence pattern C, respectively.

Referring to FIGS. 2, 3 and 4, A +, B +,
C +, A-, B- and C- are the commutation pulses for operating the semiconductor switches 3a, 3b, 3c, 3d, 3e and 3f, respectively.

The chopping duty is an on / off ratio of the chopping signal. In the order of the start sequence pattern A, the start sequence pattern B, and the start sequence pattern C, the chopping duty increases by one step, and therefore, the output torque also increases by one step.

Reference numeral 17 denotes a lock detecting means. The rotation number of the rotor of the DC motor 4 detected by the rotation number detecting means 9 is a predetermined rotation number (for example, 5 Hz).
If it is lower than this, it is determined that the DC motor 4 is in the locked state, and a lock signal is output.

Numeral 18 denotes a torque-up means A, which selects a starting sequence pattern having the smallest output torque at the time of starting, and selects a starting sequence pattern having a large one-step output torque at the time of restarting. Output.

Reference numeral 19 denotes a start-up sequence operation unit which includes the start-up sequence control means 13, the start-up sequence pattern storage means A14, the start-up sequence pattern storage means B15, and the start-up sequence pattern storage means C.
16, the lock detecting means 17 and the torque increasing means A18.

Reference numeral 20 denotes an operation mode switching means for connecting the starting sequence control means 13 and a synthesizing means 21 to be described later at the time of starting, and after starting, the commutating means 7 and the chopping signal generating means 11 are synthesized. Connect to means 21.

Reference numeral 21 denotes a synthesizing unit that synthesizes the commutation pulse and the chopping signal. Reference numeral 22 denotes a drive unit that turns on / off the semiconductor switches 3a to 3f of the inverter circuit 3 according to the output of the combining unit 21.

Reference numeral 23 is a condenser, and 24 is a cooler. 25
Denotes a refrigeration cycle, wherein the compressor 5 and the condenser 2
3. It is composed of the cooler 24. Next, the operation of the startup sequence operation section 19 will be described with reference to the flowchart of FIG.

First, at the time of startup in STEP 101, the operation mode switching means 20 connects the startup sequence control means 13 to the synthesis means 21.

Then, in STEP 102, the torque-up means A18 is activated by the start-up sequence pattern storage means A.
By outputting the starting sequence pattern A stored in the starting sequence control means 13 to the starting sequence control means 13, the compressor 5 is operated in the starting sequence pattern with the smallest output torque.

Next, at step 103, the lock detecting means 17 determines whether or not the compressor 5 is locked.
Proceed to.

At step 104, the torque increasing means A
18 outputs the start sequence pattern B stored in the start sequence pattern storage means B15 to the start sequence control means 13, so that the compressor 5 is operated in a start sequence pattern having a large one-step output torque.

Next, at step 105, the lock detecting means 17 determines whether or not the compressor 5 is locked.
Proceed to.

In step 106, the torque increasing means A
18 outputs the start sequence pattern C stored in the start sequence pattern storage means C15 to the start sequence control means 13, so that the compressor 5 is operated with a start sequence pattern having a larger one-step output torque.

Next, at step 107, the lock detecting means 17 determines whether or not the compressor 5 is locked.
Proceed to. In STEP108, the process waits for a predetermined time (for example, 5 minutes), and returns to STEP101 again.

Next, 26 is a cooler outlet temperature detecting means for detecting the cooler outlet temperature of the refrigeration cycle 25. Reference numeral 18 denotes a torque increasing means A, which compares the cooler outlet temperature detected by the cooler outlet temperature detecting means 26 at the time of start-up with a preset cooler outlet temperature, as shown in (Table 1). When the cooler outlet temperature is high, a start sequence pattern having a large output torque corresponding to the temperature is selected, and when restarting, a start sequence pattern having a larger one-step output torque is selected and output to the start sequence control means. .

[0038]

[Table 1]

As a result, the load torque of the DC motor at startup is detected by the outlet temperature of the refrigeration cycle cooler,
By starting with a start sequence pattern corresponding to the load torque from the beginning, the influence of a start failure when the load torque at the start is large due to a high ambient temperature can be further reduced.

Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 6 is an overall configuration diagram of a refrigeration cycle apparatus according to Embodiment 2 of the present invention. In FIG. 6, the same components as those in the overall configuration diagram of the refrigeration cycle apparatus of the first embodiment shown in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

28 is a cooler inlet temperature detecting means for detecting the cooler inlet temperature of the refrigeration cycle. Reference numeral 27 is a torque increasing means B, which compares the cooler inlet temperature detected by the cooler inlet temperature detecting means 27 at the time of start-up with a preset cooler inlet temperature (Table 2).
When the cooler inlet temperature is high, a start sequence pattern having a large output torque corresponding to the temperature is selected as shown in FIG. Output to.

[0042]

[Table 2]

As a result, the load torque of the DC motor at the time of startup is detected by the temperature at the inlet of the cooler, and the startup sequence pattern corresponding to the load torque is used from the beginning to start the initial pull-down of the refrigeration cycle 25 (first, the refrigeration cycle). When the load torque at the time of starting is large) or after the defrosting of the cooler 24 or the like, the influence of starting failure can be further reduced. Further, the cooler inlet temperature detecting means 27 can also serve as a means for detecting the end of defrosting.

Next, a third embodiment of the present invention will be described with reference to the drawings. FIG. 7 is an overall configuration diagram of a refrigeration cycle apparatus according to Embodiment 3 of the present invention. In FIG. 7, components having the same configuration as that of the entire configuration diagram of the refrigeration cycle device of Embodiment 1 shown in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted.

Reference numeral 26 is a cooler outlet temperature detecting means, and 28 is a cooler inlet temperature detecting means, which detects the cooler outlet temperature of the compressor 5 and the cooler inlet temperature. Reference numeral 29 denotes a torque increasing means C, which is a difference between the cooler outlet temperature and the cooler inlet temperature at the time of start-up, and a cooler inlet-cooler outlet temperature difference and a cooler inlet-cooler outlet temperature difference set in advance. Compared with each other, as shown in (Table 3), when the temperature difference between the cooler inlet and the cooler outlet is high, a start sequence pattern having a large output torque corresponding to the pressure is selected, and at the time of restart, one more step output torque is selected. Of the large start sequence pattern is output to the start sequence control means.

[0046]

[Table 3]

Thus, the load torque of the DC motor at the time of start is directly detected by the method corresponding to the load calculation of the refrigerating cycle from the temperature difference between the cooler inlet and the cooler outlet, and the load torque is determined from the beginning. By starting with the starting sequence pattern described above, the influence of starting failure when the load torque is large can be further reduced.

[0048]

As described above, the refrigeration cycle apparatus of the present invention comprises an inverter circuit in which a plurality of semiconductor switches and diodes are bridge-connected, a DC motor operated by the inverter circuit, and a compressor driven by the DC motor. Machine, a condenser constituting a refrigeration cycle including the compressor, a cooler, position detecting means for detecting the position of the rotor of the DC motor, and the inverter circuit of the inverter circuit based on the output of the position detecting means A commutation unit that outputs a commutation pulse that determines an operation of the semiconductor switch; a rotation number detection unit that detects a rotation number of the compressor based on an output of the position detection unit; and an output of the rotation number detection unit. Lock detection means for detecting a lock state of the compressor based on the output of the compressor and a chopping signal for performing chopping for varying the rotation speed of the DC motor. And chopping signal generating means for,
Synthesizing means for synthesizing the commutation pulse and the chopping signal; drive means for turning on / off a semiconductor switch of the inverter circuit by an output of the synthesizing means; and output of the position detecting means when the DC motor is started. Since it cannot be obtained, a predetermined commutation pulse and a chopping signal are output to the synthesizing means, and when the lock detecting means detects the lock of the compressor, the commutation pulse and the chopping signal are re-established after a predetermined time. Starting sequence control means for restarting, and storing the starting sequence pattern of the commutation pulse and the chopping signal output by the starting sequence control means, and outputting the stored starting sequence pattern. A plurality of starting sequence pattern storage means having different torques; The cooler outlet temperature detecting means for detecting the cooler outlet temperature of the refrigeration cycle is compared with the cooler outlet temperature detected by the cooler outlet temperature detecting means at the time of startup and a reference cooler outlet temperature set in advance. When the cooler outlet temperature is high, a start sequence pattern with a large output torque is selected according to the temperature, and when restarting, a start sequence pattern with a larger one-step output torque is selected and output to the start sequence control means. Torque increasing means A for operating, and an operation mode switching means for connecting the starting sequence control means and the synthesizing means at the time of starting, and for connecting the commutation means and the chopping signal generating means to the synthesizing means after the starting. Be prepared.

When the torque increasing means A detects the load torque of the DC motor at the time of startup directly from the cooler inlet temperature, and starts from the beginning in the startup sequence pattern according to the load torque, the load torque is large. It is possible to realize a refrigeration cycle apparatus that further reduces the influence of startup failure.

Also, an inverter circuit in which a plurality of semiconductor switches and diodes are bridge-connected, a DC motor operated by the inverter circuit, a compressor driven by the DC motor, and a refrigeration cycle including the compressor are configured. A condenser, a cooler, position detecting means for detecting a position of a rotor of the DC motor, and a commutation pulse for determining an operation of a semiconductor switch of the inverter circuit based on an output of the position detecting means. Commutation means, a rotation number detection means for detecting a rotation number of the compressor based on an output of the position detection means, and a lock for detecting a locked state of the compressor based on an output of the rotation number detection means. Detecting means, chopping signal generating means for generating a chopping signal for performing chopping to make the rotation speed of the DC motor variable, A synthesizing means for synthesizing the commutation pulse and the chopping signal, a driving means for turning on / off a semiconductor switch of the inverter circuit by an output of the synthesizing means, and an output of the position detecting means when the DC motor is started. Therefore, a commutation pulse and a chopping signal that are determined in advance are output to the synthesizing unit, and when the lock detecting unit detects the lock of the compressor, the commutation pulse and the chopping signal are re-established after a certain period of time. The starting sequence control means for performing restart to output, the starting sequence pattern of the commutation pulse and the chopping signal output by the starting sequence control means are stored, and the output torque of the starting sequence pattern stored in each is stored. A plurality of starting sequence pattern storage means different from each other, Serial and condenser inlet temperature detecting means for detecting a condenser inlet temperature, the condenser inlet temperature detecting means is compared with the cooling inlet reference temperature set in advance between the detected condenser inlet temperature at startup,
When the cooler inlet temperature is high, a start sequence pattern with a large output torque corresponding to the temperature is selected, and when restarting, a start sequence pattern with a larger one-step output torque is selected and output to the start sequence control means. Up means B, and an operation mode switching means for connecting the startup sequence control means and the synthesizing means at the time of startup, and for connecting the commutation means and the chopping signal generating means to the synthesizing means after the startup. Since the torque increasing means B directly detects the load torque of the DC motor at the time of start-up based on the cooler outlet temperature and starts from the beginning in the start-up sequence pattern according to the load torque, the load torque is large. In this case, it is possible to realize a refrigeration cycle device that further reduces the effect of startup failure.

Also, an inverter circuit in which a plurality of semiconductor switches and diodes are bridge-connected, a DC motor operated by the inverter circuit, a compressor driven by the DC motor, and a refrigeration cycle including the compressor are configured. A condenser, a cooler, position detecting means for detecting a position of a rotor of the DC motor, and a commutation pulse for determining an operation of a semiconductor switch of the inverter circuit based on an output of the position detecting means. Commutation means, a rotation number detection means for detecting a rotation number of the compressor based on an output of the position detection means, and a lock for detecting a locked state of the compressor based on an output of the rotation number detection means. Detecting means, chopping signal generating means for generating a chopping signal for performing chopping to make the rotation speed of the DC motor variable, A synthesizing means for synthesizing the commutation pulse and the chopping signal, a driving means for turning on / off a semiconductor switch of the inverter circuit by an output of the synthesizing means, and an output of the position detecting means when the DC motor is started. Therefore, a commutation pulse and a chopping signal that are determined in advance are output to the synthesizing unit, and when the lock detecting unit detects the lock of the compressor, the commutation pulse and the chopping signal are re-established after a certain period of time. The starting sequence control means for performing restart to output, the starting sequence pattern of the commutation pulse and the chopping signal output by the starting sequence control means are stored, and the output torque of the starting sequence pattern stored in each is stored. A plurality of starting sequence pattern storage means different from each other, The cooler outlet temperature detecting means for detecting the cooler outlet temperature of the compressor, the cooler inlet temperature detecting means for detecting the cooler inlet temperature of the compressor, and the cooler inlet temperature detecting means at startup are detected. Cooler inlet-cooler outlet temperature difference, which is the temperature difference between the cooler inlet temperature and the cooler outlet temperature detected by the cooler outlet temperature detection means, and a preset reference cooler inlet-cooler outlet If the temperature difference between the cooler inlet and the cooler outlet is high, the startup sequence pattern with a large output torque is selected according to the difference in the cooler inlet temperature and the cooler outlet temperature. The torque increasing means C for selecting a start sequence pattern having a large step output torque and outputting it to the start sequence control means is connected to the start sequence control means and the combining means at the time of start. Continuing, after the start-up, the torque increasing means C is provided with the operation mode switching means for connecting the commutation means and the chopping signal generating means to the combining means.
The load torque of the DC motor at startup is directly detected by the temperature difference between the cooler inlet and the cooler outlet, and the startup sequence pattern corresponding to the load torque is used from the beginning to start the startup failure when the load torque is large. It is possible to realize a refrigeration cycle device that further reduces the influence.

[Brief description of the drawings]

FIG. 1 is a block diagram of a refrigeration cycle apparatus according to Embodiment 1 of the present invention.

FIG. 2 is a time chart illustrating a start sequence pattern A according to the present embodiment.

FIG. 3 is a time chart illustrating a start sequence pattern B according to the present embodiment.

FIG. 4 is a time chart showing a start sequence pattern C of the present embodiment.

FIG. 5 is a flowchart of a startup sequence operation unit according to the embodiment.

FIG. 6 is a block diagram of a refrigeration cycle apparatus according to Embodiment 2 of the present invention.

FIG. 7 is a block diagram of a refrigeration cycle apparatus according to Embodiment 3 of the present invention.

[Explanation of symbols]

 3 Inverter circuit 4 DC motor 5 Compressor 6 Position detection means 7 Commutation means 11 Chopping signal generation means 13 Startup sequence control means 14 Startup sequence pattern storage means A 15 Startup sequence pattern storage means B 16 Startup sequence pattern storage means C 17 Lock Detecting means 18 Torque increasing means A 20 Operating mode switching means 21 Combining means 22 Drive means 23 Condenser 24 Cooler 26 Cooler inlet temperature detecting means 27 Torque increasing means B 28 Cooler outlet detecting means 29 Torque increasing means C

Claims (3)

[Claims] An inverter circuit in which a plurality of semiconductor switches and diodes are bridge-connected, a DC motor operated by the inverter circuit, a compressor driven by the DC motor, and a refrigeration cycle including the compressor. A condenser, a cooler, position detecting means for detecting a position of a rotor of the DC motor, and a commutation pulse for determining an operation of a semiconductor switch of the inverter circuit based on an output of the position detecting means. Commutation means, a rotation number detection means for detecting a rotation number of the compressor based on an output of the position detection means, and a lock for detecting a locked state of the compressor based on an output of the rotation number detection means. Detecting means, chopping signal generating means for generating a chopping signal for performing chopping for changing the rotation speed of the DC motor, and the commutation Synthesizing means for synthesizing a pulse and the chopping signal, driving means for turning on / off a semiconductor switch of the inverter circuit by an output of the synthesizing means, and no output from the position detecting means when the DC motor is started. Therefore, a predetermined commutation pulse and a chopping signal are output to the synthesizing means, and when the lock detecting means detects the lock of the compressor, the commutation pulse and the chopping signal are output again after a predetermined time. A starting sequence control unit that performs a restart and the starting sequence pattern of the commutation pulse and the chopping signal output by the starting sequence control unit are stored, and the output torques of the stored starting sequence patterns are different. A plurality of startup sequence pattern storage means; A cooler outlet temperature detecting means for detecting the cooler outlet temperature of the cycle, and comparing the cooler outlet temperature detected by the cooler outlet temperature detecting means at the time of startup with a reference cooler outlet temperature set in advance, If the cooler outlet temperature is high, select a startup sequence pattern with a large output torque according to the temperature,
At the time of restart, a torque-up means A for selecting a start-up sequence pattern having a larger one-step output torque and outputting it to the start-up sequence control means, and at the start-up time, connecting the start-up sequence control means and the synthesizing means. A refrigeration cycle apparatus comprising: an operation mode switching unit that connects the commutation unit and the chopping signal generation unit to the synthesis unit. 2. An inverter circuit in which a plurality of semiconductor switches and diodes are bridge-connected, a DC motor operated by the inverter circuit, a compressor driven by the DC motor, and a refrigeration cycle including the compressor. A condenser, a cooler, position detecting means for detecting a position of a rotor of the DC motor, and a commutation pulse for determining an operation of a semiconductor switch of the inverter circuit based on an output of the position detecting means. Commutation means, a rotation number detection means for detecting a rotation number of the compressor based on an output of the position detection means, and a lock for detecting a locked state of the compressor based on an output of the rotation number detection means. Detecting means, chopping signal generating means for generating a chopping signal for performing chopping for changing the rotation speed of the DC motor, and the commutation Synthesizing means for synthesizing a pulse and the chopping signal, driving means for turning on / off a semiconductor switch of the inverter circuit by an output of the synthesizing means, and no output from the position detecting means when the DC motor is started. Therefore, a predetermined commutation pulse and a chopping signal are output to the synthesizing means, and when the lock detecting means detects the lock of the compressor, the commutation pulse and the chopping signal are output again after a predetermined time. A starting sequence control unit that performs a restart and the starting sequence pattern of the commutation pulse and the chopping signal output by the starting sequence control unit are stored, and the output torques of the stored starting sequence patterns are different. A plurality of startup sequence pattern storage means; The cooler inlet temperature detecting means for detecting the cooler inlet temperature is compared with the cooler inlet temperature detected by the cooler inlet temperature detecting means at the time of start-up and a preset cooler inlet temperature to compare the cooler inlet temperature. When the temperature is high, a torque increasing means B for selecting a starting sequence pattern having a large output torque according to the temperature and selecting a starting sequence pattern having a larger one-step output torque for restarting and outputting the selected starting sequence control means to the starting sequence control means. A refrigeration cycle apparatus comprising: a start-up sequence control means and the synthesizing means at the time of start-up, and an operation mode switching means for connecting the commutation means and the chopping signal generating means to the synthesizing means after the start-up. 3. An inverter circuit in which a plurality of semiconductor switches and diodes are bridge-connected, a DC motor operated by the inverter circuit, a compressor driven by the DC motor, and a refrigeration cycle including the compressor. A condenser, a cooler, position detecting means for detecting a position of a rotor of the DC motor, and a commutation pulse for determining an operation of a semiconductor switch of the inverter circuit based on an output of the position detecting means. Commutation means, a rotation number detection means for detecting a rotation number of the compressor based on an output of the position detection means, and a lock for detecting a locked state of the compressor based on an output of the rotation number detection means. Detecting means, chopping signal generating means for generating a chopping signal for performing chopping for changing the rotation speed of the DC motor, and the commutation Synthesizing means for synthesizing a pulse and the chopping signal, driving means for turning on / off a semiconductor switch of the inverter circuit by an output of the synthesizing means, and no output from the position detecting means when the DC motor is started. Therefore, a predetermined commutation pulse and a chopping signal are output to the synthesizing means, and when the lock detecting means detects the lock of the compressor, the commutation pulse and the chopping signal are output again after a predetermined time. A starting sequence control unit that performs a restart and the starting sequence pattern of the commutation pulse and the chopping signal output by the starting sequence control unit are stored, and the output torques of the stored starting sequence patterns are different. A plurality of startup sequence pattern storage means; Cooler outlet temperature detecting means for detecting the cooler outlet temperature of the compressor, cooler inlet temperature detecting means for detecting the cooler inlet temperature of the compressor, and cooler detected by the cooler inlet temperature detecting means at startup Cooler inlet-cooler outlet temperature difference, which is the temperature difference between the inlet temperature and the cooler outlet temperature detected by the cooler outlet temperature detection means, and a preset reference cooler inlet-cooler outlet temperature difference When the temperature difference between the cooler inlet and the cooler outlet is high, a startup sequence pattern with a large output torque is selected according to the temperature difference between the cooler inlet and the cooler outlet, and one more step is output at restart. The torque increasing means C for selecting a start-up sequence pattern having a large torque and outputting it to the start-up sequence control means is connected to the start-up sequence control means and the combining means at the time of start-up. After starting the refrigeration cycle apparatus comprising a driving mode switching means for connecting the said commutation means chopping signal generating means to said synthesizing means.