JP2001178168A - Apparatus and method for control of dc motor for compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control apparatus for a compressor, by which a compression cycle section and a suction cycle section in the compressor are determined precisely and in which a voltage applied to a DC motor can be corrected on the basis of them. SOLUTION: The DC motor is started (step 1). The DC motor is controlled by a PWM duty mean value (step 2). The position detection time in a designated mode of the compression cycle section and that in the designated mode of the suction cycle section are calculated (step 3). The position detection time in the designated mode of the compression cycle section is compared with that in the designated mode of the suction cycle section (step 4). Whether the position detection time in the designated mode of the section on one side is longer than the position detection time in the designated mode of the section on the other side is determined and whether the number of times is 100 or layer (step 5). The section in the designated mode whose position detection time is longer is judged to be a compression cycle, and the section in the designated mode, whose position detection time is shorter is determined to be a suction cycle (step 6). A correction value is added on the basis of the mean value for every mode of the section which is determined to be the compression cycle, and the correction value is subtracted from the mean value for each mode of the section which is determined to be the section cycle (step 7). The section is controlled by the corrected PWM duty mean value (step 8).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a DC motor (hereinafter, referred to as a DC motor) mounted inside a compressor for driving the compressor.
The present invention relates to a control device, a method and a recording medium of a DC motor.

[0002]

2. Description of the Related Art A DC motor for driving the compressor is mounted inside the compressor. The control of the driving of the DC motor is as follows.

[0003] An inverter circuit is connected to the DC motor,
A driver circuit is connected to the inverter circuit, and a control circuit is connected to the driver circuit. And
The position of the rotor is detected based on the position detection circuit, and the control circuit sends a drive signal to the driver circuit based on the detected position and an external speed command signal. The driver circuit changes the voltage applied to the inverter circuit based on the drive signal, and controls the drive of the DC motor.

FIG. 7 shows a torque change state in one rotation of a DC motor of a compressor used in a refrigerator or the like.

As shown in FIG. 7, when the piston of the compressor enters the compression cycle section, the load on the DC motor increases and the torque increases accordingly. When the compression cycle section ends and enters the suction cycle section, the load decreases and the torque also decreases. In one rotation of the DC motor, the torque increases in the electrical cycle of 0 ° to 360 °, which is the compression cycle section, and decreases in the electrical angle of 360 ° to 720 °, which is the suction cycle section.

However, according to the conventional DC motor control method, as shown in FIG. 7, since the voltage applied to the inverter circuit is constant, the load is increased in the compression cycle section. The torque with respect to the load decreases, and conversely, the applied voltage in the suction cycle section is constant, so that the torque with respect to the load increases. Therefore, there is a problem that a difference occurs between a required torque and a voltage in one rotation of the DC motor, and the compressor vibrates.

In view of the above problems, the present invention accurately determines a compression cycle section and a suction cycle section in a compressor, and controls a compressor which can correct a voltage applied to a DC motor based on the judgment. An apparatus, a method, and a recording medium thereof are provided.

[0008]

According to a first aspect of the present invention, there is provided a control device for a DC motor for driving a compressor, wherein the compressor performs a compression cycle and a suction cycle by one rotation of the DC motor. There is an electric angle or a mechanical angle representing a half rotation of the DC motor as one section, and one rotation is divided into two sections, and this divided section is further divided into n sections.
Mode (n is a natural number of 2 or more), and a designation means for designating one of the n modes belonging to both sections as a designated mode, and the designation means for rotating the DC motor and Time detecting means for respectively detecting a position detection time which is the length of time during which the designated mode of the two sections continues, and comparing means for comparing the length of the position detection time of the both designated modes detected by the time detecting means Determining means for determining a section to which the designated mode having a long position detection time belongs to as a compression cycle section and determining a section to which the designated mode having a short position detection time belongs to a suction cycle section based on the comparison result of the comparing means. And a control device for the DC motor of the compressor.

According to a second aspect of the present invention, the determining means determines that the comparison result of the lengths of the position detection times of the two designation modes in the comparing means is the same result at least p times (p is a natural number of 2 or more). 2. The compressor according to claim 1, wherein a section to which the designated mode having a long position detection time belongs is determined as a compression cycle section, and a section to which the designated mode having a short position detection time belongs is determined to be a suction cycle section. It is a control device for a DC motor.

According to a third aspect of the present invention, the DC motor is driven by an inverter circuit, and the inverter circuit is supplied with an applied voltage from a driver circuit, and the compression cycle section and the suction cycle section determined by the determination means are determined. 3. The control device for a DC motor of a compressor according to claim 1, further comprising a correction unit that corrects a voltage applied to the inverter circuit in accordance with the above.

According to a fourth aspect of the present invention, the correction means stores a correction value for each mode in which the compression cycle section is divided into n pieces and a correction value for each mode in which the suction cycle section is divided into n pieces. And correcting the applied voltage for each mode belonging to the compression cycle section and the suction cycle section determined by the determination means based on the correction value for each mode stored in the storage means. A control device for a DC motor of a compressor according to claim 3.

According to a fifth aspect of the present invention, there is provided the DC motor control device for a compressor according to the fourth aspect, wherein the correction of the applied voltage performed by the correction means is performed by correcting a PWM duty value. .

According to a sixth aspect of the present invention, the correction of each mode belonging to the compression cycle section performed by the correction means increases the PWM duty value, and the correction of each mode belonging to the suction cycle section decreases the PWM duty value. The control device for a DC motor of a compressor according to claim 5, wherein

According to a seventh aspect of the present invention, the correction value of each mode stored in the storage means is set based on a load state when the DC motor is driven. 7. A control device for a DC motor of a compressor according to claim 6.

An invention according to claim 8 is a control device of a DC motor for driving a compressor, wherein the compressor performs a compression cycle and a suction cycle by one rotation of the DC motor. One rotation is divided into two sections with an electric angle or a mechanical angle representing a half rotation as one section, and the divided section is further divided into n modes (n is a natural number of 2 or more). A designating step of designating one of the n modes belonging to both sections as a designated mode, and rotating the DC motor so that the designated mode of both sections specified in the designated step lasts for a length of time. A time detecting step of detecting a certain position detecting time, a comparing step of comparing the lengths of the position detecting times of the two designated modes detected in the time detecting step, A determination step of determining a section to which the designated mode having a long position detection time belongs to as a compression cycle section and determining a section to which the designated mode having a short position detection time belongs to a suction cycle section based on the comparison result of the comparison step. A method for controlling a DC motor of a compressor, comprising:

According to a ninth aspect of the present invention, the determining step includes:
If the comparison result of the lengths of the position detection times of the two designated modes in the comparing step is the same result at least p times (p is a natural number of 2 or more), a section to which the designated mode having the long position detection time belongs is a compression cycle section. 9. The method for controlling a DC motor of a compressor according to claim 8, wherein a section to which the designated mode having a short position detection time belongs is determined as a suction cycle section.

According to a tenth aspect of the present invention, the DC motor is driven by an inverter circuit, and the inverter circuit is supplied with an applied voltage from a driver circuit.
10. The DC motor for a compressor according to claim 8, further comprising a correction step of correcting the voltage applied to the inverter circuit in accordance with the compression cycle section and the suction cycle section determined in the determination step. Is a control method.

The invention according to claim 11 has storage means for storing a correction value for each mode in which a compression cycle section is divided into n and a correction value for each mode in which a suction cycle section is divided into n. The correcting step corrects the applied voltage for each mode belonging to the compression cycle section and the suction cycle section determined by the determining step based on the correction value for each mode stored in the storage means. A method for controlling a DC motor of a compressor according to claim 10.

According to a twelfth aspect of the present invention, there is provided the method for controlling a DC motor of a compressor according to the eleventh aspect, wherein the correction of the applied voltage in the correction step is performed by correcting a PWM duty value. .

According to a thirteenth aspect of the present invention, the correction of each mode belonging to the compression cycle section performed by the correction step is performed by PW
13. The method of controlling a DC motor of a compressor according to claim 12, wherein the M duty value is increased, and the correction of each mode belonging to the suction cycle section decreases the PWM duty value.

According to a fourteenth aspect of the present invention, the correction value of each mode stored in the storage means is set based on a load state when the DC motor is driven. 14. A method for controlling a DC motor of a compressor according to claim 13.

According to a fifteenth aspect of the present invention, there is provided a recording medium storing a program for realizing a method of controlling a DC motor for driving a compressor, wherein the compressor performs a compression cycle and a suction cycle by one rotation of the DC motor. The electric angle or the mechanical angle representing a half rotation of the DC motor is defined as one section, and one rotation is divided into two sections, and the divided section is further divided into n modes (n is 2 or more). And a designation function for designating one of the n modes belonging to both sections as a designation mode, and a designation of both sections designated by the designation function by rotating the DC motor. The time detection function for detecting the position detection time, which is the length of time the mode continues, is compared with the length of the position detection time for both designated modes detected by the time detection function. Based on the comparison result of the comparison function and the comparison function, the section to which the designated mode with the long position detection time belongs is determined as the compression cycle section, and the section to which the designated mode with the short position detection time belongs is determined as the suction cycle section. A recording medium for a method for controlling a DC motor of a compressor, characterized by recording a judgment function to be performed.

According to a sixteenth aspect of the present invention, in the determination function, when the comparison result of the lengths of the position detection times of the two designation modes in the comparison function is the same result at least p times (p is a natural number of 2 or more). 16. The compressor according to claim 15, wherein a section to which the designated mode having a long position detection time belongs is determined as a compression cycle section, and a section to which the designated mode having a short position detection time belongs is determined to be a suction cycle section. It is a recording medium of a DC motor control method.

According to a seventeenth aspect of the present invention, the DC motor is driven by an inverter circuit, and the inverter circuit is supplied with an applied voltage from a driver circuit.
17. The DC motor of a compressor according to claim 15, further comprising a correction function for correcting the voltage applied to the inverter circuit in accordance with the compression cycle section and the suction cycle section determined by the determination function. Is a recording medium of the control method.

The invention of claim 18 has storage means for storing a correction value for each mode in which the compression cycle section is divided into n and a correction value for each mode in which the suction cycle section is divided into n. The correction function corrects the applied voltage for each mode belonging to the compression cycle section and the suction cycle section determined by the determination function based on the correction value for each mode stored in the storage means. A recording medium for a method for controlling a DC motor of a compressor according to claim 17.

According to a nineteenth aspect of the present invention, the correction of the applied voltage performed by the correction function is performed by correcting a PWM duty value. Medium.

In the twentieth aspect, the correction of each mode belonging to the compression cycle section performed by the correction function increases the PWM duty value, and the correction of each mode belonging to the suction cycle section decreases the PWM duty value. 20. A recording medium for a method for controlling a DC motor of a compressor according to claim 19.

According to a twenty-first aspect of the present invention, the correction value of each mode stored in the storage means is set based on a load state when the DC motor is driven. And a recording medium for a method for controlling a DC motor of a compressor according to claim 20.

A control device for a DC motor of a compressor according to claim 1 will be described.

First, in the specifying means, an electric angle or a mechanical angle representing a half rotation of the DC motor is defined as one section and is defined as 1 section.
Divide the rotation into two sections. Further, the divided section is divided into n modes. Then, one of the n modes belonging to both sections is designated as the designated mode.

A procedure for determining the compression cycle section and the suction cycle section will be described.

First, the DC motor is rotated. And
The time detecting means detects the position detection time, which is the length of time during which the designated mode of both sections designated by the designating means continues.

The comparing means compares the lengths of the position detection times of the two designated modes detected by the time detecting means.

The determining means determines, based on the comparison result of the comparing means, a section to which the designated mode with a long position detection time belongs as a compression cycle section, and determines a section to which the designated mode with a short position detection time belongs as a suction cycle section. I do.

The invention of claim 2 will be described.

The judging means judges that the section to which the designated mode having a long position detection time belongs is a compression cycle section when the comparison means compares the lengths of the position detection times of the two designated modes p times or more. Then, the section to which the designated mode with the short position detection time belongs is determined as the suction cycle section.

The invention of claim 3 will be described.

The correction means corrects the voltage applied from the driver circuit to the inverter circuit for driving the DC motor in accordance with the compression cycle section and the suction cycle section determined by the determination means.

The invention of claim 4 will be described.

The correction means corrects the applied voltage for each mode belonging to the compression cycle section and the suction cycle section determined by the determination means based on the correction value for each mode stored in the storage means.

The invention of claim 5 will be described.

The correction of the applied voltage performed by the correction means is performed by PWM.
This is performed by correcting the duty value.

The invention of claim 6 will be described.

The correction of each mode belonging to the compression cycle section performed by the correction means increases the PWM duty value,
The correction of each mode belonging to the suction cycle section is performed by PWM
Decrease the duty value.

The invention of claim 7 will be described.

The correction value of each mode stored in the storage means is set based on the load state when the DC motor is driven.

[0047]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will now be described with reference to FIGS.
Explanation will be given based on FIG.

This embodiment relates to a drive circuit 12 for a DC three-phase brushless motor (hereinafter simply referred to as a DC motor) 10 mounted on a compressor used in a refrigeration cycle of a refrigerator or an air conditioner.

FIG. 1 is a flowchart showing a control method of the drive circuit 12, FIG. 2 is a block diagram of the DC motor 10 and the drive circuit 12, FIG. 3 is an energization pattern of the DC motor 10, and FIG. FIG. 5 is a diagram showing a relationship between electrical angles in one rotation of the DC motor 10, FIG. 5 is a diagram showing a state of torque in one rotation of the DC motor 10, and FIG. 4 is a diagram illustrating torque and voltage changes.

(Structure of DC motor 10 and drive circuit 12)
The structure of the DC motor 10 and the drive circuit 12 will be described with reference to FIG.

The DC motor 10 has a three-phase Y connection, and is connected to an inverter unit 14, which is supplied with an applied voltage from a driver circuit 16.

A drive signal is output from the control circuit 18 to the driver circuit 16. A position detection circuit 20 for detecting the position of the rotor based on the phase current of each phase of the DC motor 10 is connected.
8 has been sent.

The control circuit 18 will be described.

The control circuit 18 comprises a microcomputer, and receives a position detection signal from the position detection circuit 20, a position detection unit 22, a timer unit 24, a mode specification unit 26, and a PWM correction duty storage unit (hereinafter, referred to as a PWM correction duty storage unit). It comprises a storage unit 28, a PWM average duty calculation unit (hereinafter referred to as a calculation unit) 30, and a three-phase PWM output unit (hereinafter referred to as an output unit) 32.

The position detection signal from the position detection unit 22 and the signal from the mode designation unit 26 are sent to the timer unit 24, and the signals from the timer unit 24, the storage unit 28, and the calculation unit 30 are output to the output unit 32. Sent to The output section 32 outputs a drive signal to the driver circuit 16.

Note that the position detecting section 22 is a DC motor 10
When the rotator is at a specific position, a position detection signal and a position detection interrupt are output to the timer unit 24 by a signal from the position detection circuit 20.

The timer section 24 measures the time from a specific position detection position to the next specific position detection position based on the position detection signal from the position detection section 22. As a result, the time of one rotation of the DC motor 10 can be measured.

The output section 32 outputs a drive signal, and the driver circuit 16 switches the inverter section 14 to output a D signal.
A voltage is applied to the C motor 10 to rotate the rotor of the DC motor 10.

Next, detection of the position of the rotor will be described.

The relationship between the electrical angle and the mechanical angle of the rotor is as follows. The electrical angle is 720 ° and the mechanical angle is 360 °. Hereinafter, both the electrical angle and the mechanical angle are shown in the drawings, but the description will be made based on the electrical angle.

The phase from the position detection by the position detection section 22 to the next position detection corresponds to an electrical angle of 60 °. FIG.
As shown in FIG.
(Three-phase DC motor) is equivalent to one energization of one phase of the U, V, and W phases. Energization is performed.

The phase position where the position detection is performed is at the zero cross point, that is, the phase position where the polarity of the induced voltage of the U, V and W phases of the DC motor 10 is inverted. That is, the interval between 0 crosses from phase to phase is equal to the electrical angle of 60 °.

Twelve times of this position detection, that is, 720 ° in electrical angle correspond to one rotation of the DC motor 10.

Here, at an electrical angle of 0 ° to 720 ° corresponding to one rotation of the DC motor 10, an electrical angle of 0 ° to 3 °
60 ° or less is defined as one section (hereinafter, section A), and 360 ° or more and 720 ° or less is defined as the other section (hereinafter, section A).
B section) and is divided into two sections. As shown in FIG. 4, each section is divided into six modes, one mode for each electrical angle of 60 °, and these are defined as mode 0 to mode 5.

That is, six patterns of energization for half a rotation of the three-phase motor are defined as six modes from mode 0 to mode 5.

(Control Method of DC Motor 10) After making the above preparations, the control method of the DC motor 10 is as follows.
A description will be given based on the flowchart of FIG.

1. Step 1 In step 1, the DC motor 10 is started.

2. Step 2 In step 2, the output unit 32 outputs the target rotation value of the DC motor 10 for one second set in the register of the calculation unit 30 and the actual rotation value which is the actual rotation number detected by the position detection unit 22. And outputs a PWM average duty value (hereinafter simply referred to as an average value) calculated by the calculation unit 30 based on the difference between the two. The driver circuit 10 controls the voltage applied to the inverter circuit 14 based on the average value output from the output unit 32 to rotate the DC motor 10.

3. Step 3 In step 3, the timer unit 24 detects the position detection time of the mode designated by the mode designation unit 26 (hereinafter, designated mode) from the rotating DC motor 10.

More specifically, if the designated mode is mode 2, the timer 24 calculates the position detection time in mode 2 in both the section A and the section B in one rotation of the DC motor 10. Here, the position detection time means a time during which the mode 2 continues in the section A and a time during which the mode 2 continues in the section B.

The specification mode specified by the mode specification section 26 will be described.

In the compressor manufacturing process, the DC motor 1
Figure 6 shows the relationship between the electrical angle and the position of the piston in one rotation of 0.
It is determined as shown in the following. From this positional relationship, the mode in which it is estimated that there is the most pressure difference between the compression (the operation of pushing the piston) and the suction (the operation of pulling the piston) can be estimated in advance, The mode is set in advance as the designated mode.

4. Step 4 In step 4, the designation mode of both sections (for example,
The position detection time in mode 2) is compared.

The reason for comparing the position detection times of the designated modes in both sections will be described.

Theoretically, when comparing the position detection times in the same mode with a 360 ° electrical angle separation in the DC motor 10 of the compressor, the following is obtained. When the piston of the compressor compresses the refrigerant, the load on the DC motor 10 is large, so that the position detection time is long. On the other hand, when refrigerant is sucked, D
Since the load on the C motor 10 is small, the position detection time is short.

Therefore, by comparing the lengths of the position detection times, it is possible to determine when a load is applied to the motor 10 (during compression) and when no load is applied (during suction). This comparison is easier to perform as the difference between the loads applied to the DC motor 10 increases.

5. Step 5 In step 5, the operation of step 4 is performed at least 100 times, and the state where the position detection time of the designated mode in one section is longer than the position detection time of the designated mode in the other section occurs continuously 100 times or more. Judge whether or not.

The reason for making this determination is that it is difficult to specify compression and suction based on the comparison result of only one rotation of the DC motor 10. Then, in order to have more certainty, if the same result of the magnitude comparison occurs continuously for a specified number of times or more, for example, A section is determined as a compression cycle section and B section is determined as a suction cycle section. is there.

6. Step 6 In step 6, the section of the designated mode having the longer position detection time is determined as the compression cycle section, and the section to which the shorter designated mode belongs is determined as the suction cycle section.
Hereinafter, for the sake of simplicity, the description will be made assuming that the section A is determined as the compression cycle section and the suction cycle section is determined as the section B.

7. Step 7 In step 7, the average value for each mode belonging to the compression cycle section (section A) and the suction cycle section (section B) is a PWM duty correction value (hereinafter simply referred to as a correction value) stored in the storage unit 28. Is corrected based on That is, the storage unit 28 stores a correction value for each mode in the compression cycle section and a correction value for each mode in the suction cycle section. Then, specifically, the correction is performed as follows.

The average value in each mode of the section A determined as the compression cycle section is added to the correction value of each mode of the compression cycle section stored in the storage section 28. And
The PWM duty value in each mode is increased.

On the other hand, B determined to be in the suction cycle section
The PWM duty value of each mode in the B section is reduced by subtracting the correction value of each mode in the suction cycle section stored in the storage unit 28 from the average value of each mode in the section. FIG. 5 shows this state.

The correction value set for each mode in each cycle of the compression cycle section and the suction cycle section of the storage unit 28 is, as shown in FIG.
0 is a correction value in consideration of a torque along a motor torque curve derived by using a method such as a simulation. Remember.

By doing so, the PWM duty value in section A is increased by the correction value, and the PWM duty value in section B is increased.
By reducing the M duty value by the correction value, the correction along the motor torque curve can be performed, and the applied voltage along the motor torque curve can be supplied to the inverter unit 14 as shown in FIG.

Therefore, it is possible to prevent the compressor from vibrating due to fluctuations in the rotational speed of the piston connected to the DC motor 10 in the compressor.

In particular, in the case of this embodiment, the compression cycle section or the suction cycle section is further divided into six to finely correct the PWM duty value, so that the vibration can be further reduced.

(Modification 1) In the above embodiment, the description has been made using a three-phase motor. Therefore, the A section and the B section are each divided into six modes. However, the present invention is not limited to this. The division may be performed in the n mode (n is a natural number of 6 or more). In particular, the finer the division, the more finely the PWM duty value can be controlled, so that the vibration can be reduced.

(Modification 2) In the above embodiment, the inside of the control circuit 18 composed of a microcomputer has been described as an apparatus. However, the position detection unit 22, the timer unit 24, the mode designation unit 26, and the storage unit 28 , The calculation unit 30, the output unit 32, and other functions of the configuration can be executed by programs, and these programs are stored in FD, DVD, M
O, recorded on a recording medium such as a hard disk,
This embodiment may be realized.

[0089]

As described above, according to the present invention, the compression cycle section and the suction cycle section can be reliably determined when the motor of the compressor is driven.

By judging the compression cycle section and the suction cycle section, the voltage applied to the motor can be corrected in accordance with the state of the load applied to the motor, thereby preventing the compressor from vibrating.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a control state of a drive circuit of a DC motor according to an embodiment of the present invention.

FIG. 2 is a block diagram of a DC motor and a drive circuit.

FIG. 3 is an explanatory diagram of an energization pattern of a DC motor.

FIG. 4 is a diagram illustrating a state of an electrical angle per one rotation of a DC motor.

FIG. 5 is a drawing showing a torque curve per one rotation of a DC motor and a correction value.

FIG. 6 is a diagram showing a torque curve per rotation of a DC motor and a corrected applied voltage.

FIG. 7 is an explanatory diagram showing a torque curve and an applied voltage in a conventional DC motor 10.

[Explanation of symbols]

 Reference Signs List 10 DC motor 12 drive circuit 14 inverter section 16 driver circuit 18 control circuit 20 position detection circuit 22 position detection section 24 timer section 26 mode designation section 28 storage section 30 calculation section 32 output section

Continued on the front page (72) Inventor Shigeo Hirahara 1-6 Ota Toshiba-cho, Ibaraki-shi, Osaka F-term in the Toshiba Osaka Plant (reference) 3H045 AA09 AA27 BA38 CA25 CA29 DA07 EA35 5H571 AA11 BB04 EE03 HD02 JJ03 JJ18 JJ25 KK06 LL32 5H607 AA04 BB04 BB09 BB14 CC01 CC05 CC07 FF07 HH01

Claims (21)

[Claims] 1. A control device for a DC motor that drives a compressor, wherein the compressor performs a compression cycle and a suction cycle in one rotation of the DC motor, and represents a half rotation of the DC motor. One rotation is divided into two sections with the electrical angle or mechanical angle as one section,
The divided section is further divided into n modes (n is a natural number of 2 or more), and a designating means for designating one of the n modes belonging to both sections as a designated mode, and rotating the DC motor. A time detecting means for respectively detecting a position detection time which is a length of time during which the specified mode of the two sections specified by the specifying means continues, and a position detecting time of the two specified modes detected by the time detecting means. Comparing means for comparing the length, based on a comparison result of the comparing means, a section to which the designated mode having a long position detection time belongs is determined as a compression cycle section, and a section to which the designated mode having a short position detection time belongs is a suction cycle. A control device for a DC motor of a compressor, comprising: a determination unit configured to determine a section. 2. The method according to claim 1, wherein the comparing unit determines that the comparison result of the lengths of the position detection times of the two designated modes is the same at least p times (p is a natural number of 2 or more). 2. The control device for a DC motor of a compressor according to claim 1, wherein a section to which the long designated mode belongs is determined as a compression cycle section, and a section to which the designated mode with short position detection time belongs is determined as a suction cycle section. . 3. The DC motor is driven by an inverter circuit. The inverter circuit is supplied with an applied voltage from a driver circuit. The inverter circuit adjusts the compression cycle section and the suction cycle section determined by the determination means. 3. The control device for a DC motor of a compressor according to claim 1, further comprising correction means for correcting each of voltages applied to the circuit. 4. The storage device according to claim 1, wherein the correction means includes a storage means for storing a correction value for each mode obtained by dividing the compression cycle section into n pieces, and a correction value for each mode obtained by dividing the suction cycle section into n pieces. 4. The correction of the applied voltage for each mode belonging to the compression cycle section and the suction cycle section determined by the determination means based on the correction value for each mode stored in the storage means. Control device for DC motor of compressor. 5. The method according to claim 1, wherein the correction of the applied voltage performed by said correction means is P
The control device for a DC motor of a compressor according to claim 4, wherein the control is performed by correcting a WM duty value. 6. The correction of each mode belonging to the compression cycle section performed by the correction means increases the PWM duty value, and the correction of each mode belonging to the suction cycle section comprises P
6. The control device for a DC motor of a compressor according to claim 5, wherein the WM duty value is reduced. 7. The correction value of each mode stored in the storage means is set based on a load state at the time of driving the DC motor. Control device for DC motor of compressor. 8. A control device for a DC motor for driving a compressor, wherein the compressor performs a compression cycle and a suction cycle in one rotation of the DC motor, and represents a half rotation of the DC motor. One rotation is divided into two sections with the electrical angle or mechanical angle as one section,
A designation step of further dividing each of the divided sections into n modes (n is a natural number of 2 or more), and designating one of the n modes belonging to both sections as a designated mode; A time detection step of detecting a position detection time that is a length of time during which the designated mode of the two sections specified in the designation step continues, and a position detection time of the two designated modes detected in the time detection step. A comparing step of comparing the lengths, based on a comparison result of the comparing step, a section to which the designated mode having a long position detection time belongs is determined as a compression cycle section, and a section to which the designated mode having a short position detection time belongs is a suction cycle. A determining step of determining a section; and a method of controlling a DC motor of a compressor. 9. The method according to claim 9, wherein the comparison result of the lengths of the position detection times of the two designated modes in the comparing step is equal to or more than p times (p is a natural number of 2 or more). 9. The method for controlling a DC motor of a compressor according to claim 8, wherein a section to which the long designated mode belongs is determined as a compression cycle section, and a section to which the designated mode with short position detection time belongs is determined to be a suction cycle section. . 10. The DC motor is driven by an inverter circuit. The inverter circuit is supplied with an applied voltage from a driver circuit. The inverter circuit is driven in accordance with the compression cycle section and the suction cycle section determined in the determination step. 10. The control method for a DC motor of a compressor according to claim 8, further comprising a correction step of correcting each voltage applied to the circuit. 11. A storage means for storing a correction value for each mode obtained by dividing a compression cycle section into n pieces, and a correction value for each mode obtained by dividing a suction cycle section into n pieces. 11. The correction of the applied voltage for each mode belonging to each of the compression cycle section and the suction cycle section determined by the determination step based on the correction value for each mode stored in the storage means. Control method of DC motor of compressor. 12. The control method for a DC motor of a compressor according to claim 11, wherein the correction of the applied voltage performed in said correction step is performed by correcting a PWM duty value. 13. The method according to claim 1, wherein the correction of each mode belonging to the compression cycle section performed by the correction step increases a PWM duty value, and the correction of each mode belonging to the suction cycle section decreases the PWM duty value. The method for controlling a DC motor of a compressor according to claim 12. 14. The apparatus according to claim 10, wherein the correction value of each mode stored in said storage means is set based on a load state when said DC motor is driven.
4. The method for controlling a DC motor of a compressor according to claim 3. 15. A recording medium storing a program for implementing a method of controlling a DC motor that drives a compressor, wherein the compressor performs a compression cycle and a suction cycle with one rotation of the DC motor. An electric angle representing a half rotation of the DC motor, or a mechanical angle as one section, one rotation is divided into two sections,
The divided sections are further divided into n modes (n is a natural number of 2 or more), and a designation function for designating one of the n modes belonging to both sections as a designated mode, and rotating the DC motor. A time detection function for detecting a position detection time, which is the length of time during which the designated mode of the two sections specified by the designated function continues, and a position detection time for both designated modes detected by the time detection function. Based on the comparison result of the comparison function, the section to which the designated mode with the long position detection time belongs is determined to be the compression cycle section, and the section to which the designated mode with the short position detection time belongs is the suction cycle. A recording medium for a method of controlling a DC motor of a compressor, wherein a recording function is recorded. 16. The method according to claim 16, wherein the comparison function compares the lengths of the position detection times of the two designated modes with the same result at least p times (p is a natural number of 2 or more). 16. The method of controlling a DC motor of a compressor according to claim 15, wherein a section to which the long designated mode belongs is determined as a compression cycle section, and a section to which the designated mode with short position detection time belongs is determined to be a suction cycle section. Recording medium. 17. The DC motor is driven by an inverter circuit, which is supplied with an applied voltage from a driver circuit. The inverter circuit adjusts the compression cycle section and the suction cycle section determined by the determination function. 17. The recording medium for a method of controlling a DC motor of a compressor according to claim 15, wherein the recording medium has a correction function for correcting a voltage applied to a circuit. 18. A storage means for storing a correction value for each mode obtained by dividing a compression cycle section into n pieces, and a correction value for each mode obtained by dividing a suction cycle section into n pieces. 18. The correction of the applied voltage for each mode belonging to the compression cycle section and the suction cycle section determined by the determination function based on the correction value for each mode stored in the storage means. Recording medium for controlling the DC motor of the compressor. 19. The correction of an applied voltage performed by the correction function,
19. The recording medium according to claim 18, wherein the control is performed by correcting the PWM duty value. 20. The correction of each mode belonging to the compression cycle section performed by the correction function increases the PWM duty value, and the correction of each mode belonging to the suction cycle section comprises P
20. The recording medium according to claim 19, wherein the WM duty value is reduced. 21. The apparatus according to claim 17, wherein the correction value of each mode stored in the storage means is set based on a load state when the DC motor is driven.
0. The recording medium of the method for controlling a DC motor of a compressor according to 0.