JP3365107B2 - DC brushless motor drive control device for compressor of air conditioner - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION This invention relates to a drive control apparatus for a brushless DC motor for a compressor drive to be used for the air conditioner.

[0002]

BACKGROUND ART FIG. 12 is a configuration diagram of a drive control device of a DC brushless motor for the compressor drive of a conventional air conditioner, FIG. 13
Is a flowchart of its operation, and FIG. 14 is a time chart for explaining its operation. In the figure, (1) is an AC power supply, (2) is a rectifier circuit that converts the AC voltage of the AC power supply (1) into DC voltage, (3) is a smoothing capacitor, (4) is a smoothing capacitor (3). An inverter circuit for converting the smoothed DC voltage into a three-phase AC voltage, (5) is a DC brushless motor.

[0006] (6) is an operation request from the indoor unit of the air conditioner, (7)
Is data from various sensors of the outdoor unit, (8) is operation request from the indoor unit (6) and data from various sensors of the outdoor unit
Command frequency determining means for determining the command frequency of the DC brushless motor (5) drive voltage by (7), (9) determines the rotational position of the rotor from the back electromotive force induced in the DC brushless motor (5). Rotor position detecting means for detecting, (10) actual frequency calculating means for calculating the actual rotation frequency of the rotor (hereinafter simply referred to as actual frequency) by input from the rotor position detecting means (9), (11) command frequency determining means Frequency comparison means for comparing the command frequency determined by (8) with the actual frequency calculated by the actual frequency calculation means (10), and (12) the duty ratio is adjusted according to the output of the frequency comparison means (11). PWM waveform signal generation means for generating a PWM waveform signal for controlling the inverter circuit (4).

[0004] Next will be described the operation by the flowchart of FIG. 13. Now, the command frequency higher than the actual frequency of the DC brushless motor (5) is determined by the command frequency determining means (8) according to the operation request from the indoor unit (6) and the changes in the data (7) from various sensors of the outdoor unit. Then, the command frequency is read in step (S1), and the actual frequency calculation means (1
The actual frequency calculated by (0) is read in step (S2), and both frequencies are compared in step (S3) (frequency comparison means (11)). Since the command frequency is higher than the actual frequency, the process proceeds to step (S4), and the duty ratio of the PWM waveform signal generated by the PWM waveform signal generation means (12) increases. As a result, the output voltage from the inverter circuit (4) rises,
The rotation speed of the DC brushless motor (5) rises and the actual frequency rises. When the actual frequency reaches the command frequency, the process proceeds from step (S3) and (S5) to return, the increase of the duty ratio stops, and the operation at the matched frequency is continued.

During the operation of the DC brushless motor (5), due to a change in the operation request (6) from the indoor unit and data (7) from various sensors of the outdoor unit, the command frequency lower than the actual frequency is determined by the command frequency determining means ( 8) determined by step
From (S3) to step (S5) and step (S6), the duty ratio of the PWM waveform signal generated by the PWM waveform signal generation means (12) is reduced. As a result, the output voltage from the inverter circuit (4) drops, the rotation speed of the DC brushless motor (5) drops, and it drops until the actual frequency reaches the command frequency.

[0006]

A conventional air conditioner compressor.
Since the drive controller of the DC brushless motor for driving is configured as described above, the DC brushless motor (5) is not changed after the voltage applied to it changes.
By the time the actual frequency of (5) changes, the rotor position detection means (9) then detects the rotational position of the rotor, the actual frequency calculation means (10) calculates the changed actual frequency, and the frequency comparison means (11) until is compared with the commanded frequency), since it takes a certain degree of time, it will be repeated overshoot and undershoot actual frequency will past the command frequency, across the command frequency as shown in FIG. 14 There is a problem that the actual frequency pulsates.

Further, even when an abnormal overload torque is applied to the motor, an attempt is made to bring the actual frequency closer to the command frequency, and the duty is gradually increased to supply an excessive drive voltage, resulting in a result. There is a problem that the load of the motor such as the electronic / electrical parts of the motor drive system and the compressor may be damaged.

The present invention has been made to solve the above-mentioned problems, and prevents the operating frequency from pulsating when the command frequency and the actual frequency are extremely close to each other and at a frequency closer to the command frequency. Enable driving in
The object is to obtain a drive control device for a DC brushless motor for driving a compressor of an air conditioner .

Further, a DC brushless motor for driving a compressor of an air conditioner capable of preventing overspeed operation of the DC brushless motor in the abnormal overload state and damage of the load of electronic / electrical parts, the compressor, etc. associated therewith. The purpose is to obtain a drive control device of.

[0010]

An air conditioner according to the present invention
Drive control device of a compressor driving DC brushless motor is exceeded the upper limit level of the output signal is determined for each frequency of the motors driving the output voltage control means, not further increase the DC brushless motor driving voltage The output voltage regulating means for controlling the above is provided . Also, those in which a stall control means the magnitude of the output signal and outputs a control signal to stall the DC brushless motor exceeds the upper limit value determined for each frequency in the inverter circuit of the motor drive output voltage control means is there.

Further, in each of the above inventions, the actual frequency and
The minimum change width of this command frequency is compared to the command frequency to be compared.
The dead zone adding means that gives a predetermined width
The command frequency at which the wave number is added by this dead band addition means
DC brushless motor drive voltage is applied only outside the specified width of
The output to be reduced is output from the frequency comparison means to the motor drive output.
The pressure is output to the pressure control means.

[0012]

[Action] In this invention, since the size of the motors driving waveform signal does not exceed the upper limit value determined for each frequency,
More than necessary drive voltage is not supplied to the DC brushless motor even in the overload state . Also, when the magnitude of the motor drive waveform signal exceeds the upper limit value determined for each frequency, since the DC brushless motor is stalled control, never operation is continued in an abnormal overload condition.

Furthermore, the command frequency and the actual frequency are
DC brushless only when the specified width is smaller than the specified width
Since the motor drive voltage changes, the actual frequency is fed.
The time delay that occurs until it is backed up is absorbed,
Repeated overshoots and undershoots
At a real frequency different from the command frequency within the dead band
There is no steady operation.

[0014]

EXAMPLES Example 1. Embodiment 1 of the present invention will be described below with reference to the drawings. Figure 1
2 is a configuration diagram of this embodiment, FIG. 2 is an operation flowchart thereof, and FIG. 3 is an operation explanatory view thereof. In the figure, (1) is an AC power supply, (2) is a rectifier circuit, (3) is a smoothing capacitor,
(4) is an inverter circuit, (5) is a DC brushless motor,
(6) is an operation request from the indoor unit of the air conditioner, (7) is data from various sensors of the outdoor unit, (8) is a command frequency determining means,
(9) is rotor position detection means, (10) is actual frequency calculation means,
(11) the frequency comparison means, in (12) PWM waveform signal generating means (motor drive output voltage control means), or is similar to the conventional example shown in FIG. 12. (14) is a duty ratio restriction means the duty ratio of the PWM waveform signal is controlled not to exceed the upper limit value determined for each frequency as shown in FIG. 3 (output voltage regulating means).

[0015] Next will be described the operation by the flowchart of FIG. Now, when the command frequency higher than the actual frequency of the DC brushless motor (5) is determined by the command frequency determination means (8), the command frequency is read in step (S1) and calculated by the actual frequency calculation means (10). The determined actual frequency is read in step (S2), and the command frequency and the actual frequency are compared in steps (S3) (S5). If the actual frequency is less than or equal to the command frequency, proceed to step (S9), at which time PWM
If the PWM waveform signal generated by the waveform signal generating means (12) does not exceed the upper limit value defined for each frequency as shown in FIG. 3 , the process proceeds from step (S9) to step (S4) to perform PWM. The duty ratio of the PWM waveform signal generated by the waveform signal generation means (12) increases. As a result, the output voltage from the inverter circuit (4) rises, the rotation speed of the DC brushless motor (5) rises, and the actual frequency rises.

However, since the command frequency is set high, the PW
When the duty ratio of the PWM waveform signal generated by the M waveform signal generating means (12) reaches the upper limit value determined for each frequency in FIG. 3 , the process proceeds from step (S9) to return, and the increase of the duty ratio stops. (Duty ratio control means (14)) The operation is continued at the upper limit value of the duty ratio. In this way, more than necessary drive voltage is not supplied to the DC brushless motor even under abnormal overload conditions.

During operation of the DC brushless motor (5), when a command frequency lower than the actual frequency is determined by the command frequency determining means (8), the process proceeds from step (S3) to step (S5) and step (S6), The duty ratio of the PWM waveform signal generated by the PWM waveform signal generation means (12) decreases. As a result, the output voltage from the inverter circuit (4) drops, the rotation speed of the DC brushless motor (5) drops, and it drops until the actual frequency reaches the command frequency.

In this embodiment, as shown in FIG. 3 , the upper limit of the duty ratio is controlled so as to be proportional to the actual frequency. This means that the pulse width of the PWM waveform signal at this upper limit value is constant regardless of the frequency, and thus the maximum value of the pulse width of the PWM waveform signal may be simply restricted. In addition, the FIG. 3 can also be controlled to have a relationship of the duty ratio upper limit value and the actual frequency different Tsu.

Example 2 Next, a second embodiment of the present invention will be described with reference to FIGS. 4, 5, 6 and 7.
Therefore, it will be described. Figure 4 is block diagram of the embodiment, FIG. 5 Waso
Operation flowchart Les, 6, 7 and that of Operation
It is a time chart for. In the figure, (1) is an AC power supply, (2) is a rectifier circuit, (3) is a smoothing capacitor, (4) is an inverter circuit, (5) is a DC brushless motor, and (6) is an indoor unit of an air conditioner. Operation request, (7) data from various sensors of the outdoor unit, (8) command frequency determination means, (9) rotor position detection means, (10) actual frequency calculation means, (11) frequency comparison Means, (12) is PWM waveform signal generation means (motor drive output voltage control means), (14) is duty ratio regulation means, the above is the same as the first embodiment, and (13) is a command
Frequency comparison means determined by the frequency determination means (8)
The command frequency compared with the actual frequency by (11) ±
It is a dead zone adding means for giving Δr .

[0020] Next will be described the operation by the flowchart of FIG. Now, when the command frequency higher than the actual frequency of the DC brushless motor (5) is determined by the command frequency determination means (8), the command frequency is read in step (S1) and calculated by the actual frequency calculation means (10). The determined actual frequency is read in step (S2), and the dead frequency adding means (13) compares the command frequency to which the dead band ± Δr is added with the actual frequency in steps (S7) and (S8).

If the actual frequency is lower than the dead band of the command frequency, that is, Δr or more, the process proceeds to step (S9), at which time the PWM waveform signal generated by the PWM waveform signal generating means (12) is set to the upper limit set for each frequency. If it does not exceed the value, the process proceeds from step (S9) to step (S4), and the duty ratio of the PWM waveform signal generated by the PWM waveform signal generation means (12) increases. As a result, the output voltage from the inverter circuit (4) rises, the rotation speed of the DC brushless motor (5) rises, and the actual frequency rises.

When the actual frequency reaches within the dead band near the command frequency, the process proceeds from steps (S7) and (S8) to return, the increase of the duty ratio stops, and it corresponds to the duty ratio at that time as shown in FIG. , Operation at the actual frequency slightly lower than the command frequency is continued. However, due to the time lag required for feedback of the actual frequency, the actual frequency actually slightly increases thereafter, but the dead band width 2Δr is set so that the dead band is not exceeded by the increase due to the time lag. There is no overshoot. As a result, the pulsation of the actual frequency sandwiching the command frequency is prevented.

Further, the command frequency is set high, and the PWM
When the duty ratio of the PWM waveform signal generated by the waveform signal generation means (12) reaches the upper limit value determined for each frequency, the process proceeds from step (S9) to return, and the increase of the duty ratio stops (duty ratio regulation). Means (14)) Operation is continued at the duty ratio upper limit value. In this way, an excessive drive voltage is not supplied to the DC brushless motor even in the overload state.

During operation of the DC brushless motor (5), indoors
Operation request from the unit (6) and data from various sensors of the outdoor unit.
When a command frequency lower than the actual frequency by Δr or more is determined by the command frequency determining means (8) due to a change in the data (7) ,
From step (S7) to step (S8) and step (S6),
The duty ratio of the PWM waveform signal generated by the PWM waveform signal generation means (12) decreases. As a result, the output voltage from the inverter circuit (4) drops and the DC brushless motor
The rotation speed of (5) decreases, and decreases until the actual frequency reaches within the command frequency dead zone. Also at this time, the undershoot in which the actual frequency falls below the dead band of the command frequency does not occur.

By providing a dead band in the command frequency,
The pulsation of the actual frequency could be eliminated, but its dead band width
If 2Δr is made too large, as shown in FIG.
The command frequency does not change regardless of the change in the command frequency within the dead band width.
Stable at the actual frequency (offset frequency) that has a difference from the number
There may be cases where Therefore, in this example,
With the specified width of the command frequency added by the band addition means (13)
The dead band width 2Δr is smaller than the minimum change width of the command frequency.
I have been cut.

Here, the minimum change width of the command frequency is the
The duty ratio, that is, the pulse width of the PWM waveform signal may change
The change amount of the command frequency corresponding to the minimum change amount. one
Generally, the duty ratio, that is, the pulse width of the PWM waveform signal is
Since it is outputting using the timer of the microcomputer,
The pulse width is limited only by its temporal resolution and changes only discretely.
I can't. The smallest data that can be changed discretely
Minimum output voltage of inverter circuit due to variation of duty ratio
Changes in motor speed, that is, changes in actual frequency caused by changes
Quantity and the power supply side of the inverter circuit (4) generated by it
It is obtained from the amount of change in the input current, and in this embodiment, it is 0.
It is set to 5 Hz.

Example 3 In the first and second embodiments, the operation is continued at the upper limit of the duty ratio even when the duty ratio exceeds the upper limit and increases due to an abnormal state such as an abnormal overload or a device failure. In Example 3 , this abnormal state is detected and the DC brushless motor is stalled. Figure 8
Is a configuration diagram showing the third embodiment, and FIG. 9 is an operation flowchart thereof.

In the figure, (1) is an AC power supply, (2) is a rectifier circuit, (3) is a smoothing capacitor, (4) is an inverter circuit,
(5) DC brushless motor, (6) Operation request from indoor unit of air conditioner, (7) Data from various sensors of outdoor unit, (8) Command frequency determining means, (9) Rotor position Detection means, (10) actual frequency calculation means, (11) frequency comparison means,
(12) in the PWM waveform signal generating means (motor drive output voltage control means), or is similar to the second embodiment shown in FIG. (15) is a stall control means for outputting to the inverter circuit a control signal for stalling the DC brushless motor when the duty ratio of the PWM waveform signal exceeds the upper limit value set for each frequency.

[0029] Next will be described the operation by the flowchart of FIG. Now, it is assumed that the command frequency determining means (8) determines a command frequency higher than the actual frequency of the DC brushless motor (5). At that time, DC brushless motor
If (5) is started or if the duty ratio of the PWM waveform signal is operating below the limit value, the upper limit flag has been reset, so proceed from step (S12) to step (S1) Is read in step (S1), the actual frequency calculated by the actual frequency calculating means (10) is read in step (S2), and the comparison between the command frequency and the actual frequency is performed in steps (S3) (S5). .

If the actual frequency is equal to or lower than the command frequency, the process proceeds to step (S9), at which time the PWM waveform signal generated by the PWM waveform signal generating means (12) must exceed the upper limit value set for each frequency. For example, from step (S9) to step
Proceed to (S4), the duty ratio of the PWM waveform signal generated by the PWM waveform signal generation means (12) increases, and the step (S1
The upper limit flag is reset in 1), and the procedure proceeds to return. As a result, the output voltage from the inverter circuit (4) rises, the rotation speed of the DC brushless motor (5) rises,
The actual frequency rises.

However, when the command frequency is set high, PW
When the duty ratio of the PWM waveform signal generated by the M waveform signal generating means (12) reaches the upper limit value determined for each frequency, the process proceeds from step (S9) to step (S10), and the upper limit flag is set. , Go to return. In this way, once the duty ratio reaches the upper limit value, the increase of the duty ratio stops, and the stall control operation is started in which the command frequency decreases from the next cycle (stall control means).

That is, the step (S12) of the next cycle proceeds to the step (S13), the command frequency is lowered, the command frequency becomes equal to or lower than the actual frequency, and the steps (S1), (S2), (S3),
From (S5) to step (S6), the duty ratio of the PWM waveform signal is lowered, the rotation speed of the DC brushless motor (5) is lowered, and the actual frequency is lowered. As a result, if the abnormal condition is released, the command frequency exceeds the actual frequency, and the process proceeds to step (S9) again, and if the duty ratio is below the upper limit value, the process proceeds to steps (S4) and (S11), and the PWM waveform The signal duty ratio increases, the upper limit flag is reset, and normal operation starts. If the command frequency does not exceed the actual frequency by the above stall control, it is determined that the abnormal state is still present, and the DC brushless motor (5) is stopped. In this way, the expansion of the abnormal state is prevented.

Example 4 Although the dead band is not provided in the command frequency in the third embodiment, if the dead band is provided in the command frequency, the stall control operation is further smoothly performed. FIG. 10 is a configuration diagram showing a fifth embodiment in this case, and FIG. 11 is an operation flowchart thereof. In the figure, (1) is an AC power supply, (2) is a rectifier circuit, (3) is a smoothing capacitor, (4) is an inverter circuit, (5) is a DC brushless motor, and (6) is an indoor unit of an air conditioner. Operation request, (7) data from various sensors of the outdoor unit, (8) command frequency determination means, (9) rotor position detection means, (10) actual frequency calculation means, (11) frequency comparison Means, (12) is a PWM waveform signal generating means (motor drive output voltage control means), and (13) is a dead zone adding means. The above is the same as that of the first embodiment. (15)
Is a stall control means similar to that of the fourth embodiment.

[0034] Next will be described the operation by the flowchart of FIG. 11. Now, it is assumed that the command frequency determining means (8) determines a command frequency higher than the actual frequency of the DC brushless motor (5). At that time, if the upper limit flag is reset, the steps (S12) to (S12)
Proceeding to 1), the command frequency is read in step (S1), the actual frequency is read in step (S2), and the command frequency and the actual frequency are compared in steps (S7) (S8). If the actual frequency is below the dead band of the command frequency, proceed to step (S9), at which time P
If the WM waveform signal does not exceed the upper limit, step (S
The process proceeds from step 9) to step (S4), the duty ratio of the PWM waveform signal increases, the upper limit flag is reset at step (S11), and the process returns. As a result, the output voltage from the inverter circuit (4) rises, the rotation speed of the DC brushless motor (5) rises, and the actual frequency rises.

However, since the command frequency is set high, the PW
When the duty ratio of the M waveform signal reaches the upper limit value, the process proceeds from step (S9) to step (S10), the upper limit flag is set, the stall control operation is started, the increase of the duty ratio stops, and from the next cycle. The command frequency drops.
That is, the command frequency is lowered in step (S13) of the next cycle, the command frequency becomes lower than the actual frequency by the dead band width, and steps (S1), (S2), (S7), and (S8) to step (S6).
And the duty ratio of the PWM waveform signal is lowered,
The rotation speed of the DC brushless motor (5) decreases. If the abnormal condition such as overload or equipment failure is cleared and the DC brushless motor (5) is started normally, the process proceeds from step (S3) to step (S4) and (S11), and the upper limit flag is reset. Then, normal operation starts.

[0036]

EFFECTS OF THE INVENTION The present invention, since the magnitude of the output signal of the motors driving the output voltage control means is not allowed to exceed the upper limit value determined for each frequency, the more than necessary even when overloaded The drive voltage is supplied to the DC brushless motor, and the DC brushless motor drive control device for driving the compressor of the air conditioner , which is highly reliable and does not burn or stop, can be obtained .

[0037] Also, releasing the magnitude of the output signal of the motor drive output voltage control means exceeds the upper limit value determined for each frequency, the abnormal state of overload or failure or the like stalled controlling the DC brushless motor Since this is done, there is an effect that the abnormality does not spread due to continued operation in an abnormal state and a highly reliable DC brushless motor drive controller for driving a compressor of a long-life air conditioner is obtained.

Further, in each of the above inventions, the actual frequency and
The minimum change width of this command frequency is compared to the command frequency to be compared.
The dead zone adding means that gives a predetermined width
The command frequency at which the wave number is added by this dead band addition means
DC brushless motor drive voltage is applied only outside the specified width of
The output to be reduced is output from the frequency comparison means to the motor drive output.
Since it is output to the pressure control means, it is possible to
Occurs before the actual frequency is fed back.
Time delay is absorbed and overshoot or undershoot
Is repeated and the fingers within the dead band width
There is no possibility of steady operation at an actual frequency different from the regulation frequency.
It is the best
It is possible to match the command frequency and the actual frequency with control accuracy.
DC brushless motor drive for air conditioner compressor drive
The control device can be obtained.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a first embodiment of the present invention.

FIG. 2 is an operation flowchart of the first embodiment.

FIG. 3 is an operation explanatory diagram of the first embodiment.

FIG. 4 is a configuration diagram of a second embodiment of the present invention .

FIG. 5 is an operation flowchart of the second embodiment .

FIG. 6 is a time chart for explaining the operation of the second embodiment.

FIG. 7 is a time chart for explaining the operation of the second embodiment.

FIG. 8 is a configuration diagram of a third embodiment of the present invention.

FIG. 9 is an operation flowchart of the third embodiment.

FIG. 10 is a configuration diagram of a fourth embodiment of the present invention.

FIG. 11 is an operation flowchart of the fourth embodiment.

FIG. 12: Drive control device for conventional DC brushless motor
Configuration diagram of the table .

FIG. 13 is an operation flowchart of a conventional example .

FIG. 14 is a time chart for explaining the operation of the conventional example .

[Explanation of symbols]

4 Inverter circuit, 5 DC brushless motor, 8
Command frequency determining means, 9 rotor position detecting means, 10
Actual frequency calculation means, 11 frequency comparison means, 12 PW
M waveform signal generation means (motor drive output voltage control means),
13 dead zone adding means, 14 duty ratio regulating means (output voltage regulating means), 15 stall control means.

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Isao Kawasaki 3-18-1, Oga, Shizuoka City Mitsubishi Electric Co., Ltd. Shizuoka Factory (72) Inventor Takahiro Ishigami 3-18-1, Oka, Shizuoka Mitsubishi Electric Engineering Co., Ltd.Nagoya Works Shizuoka Branch (72) Inventor Yoshihiro Iwasaki 3-18-1, Oga, Shizuoka City Mitsubishi Electric Engineering Co., Ltd. Nagoya Works Shizuoka Branch (72) Inventor Yoshihiko Yoshikawa Shizuoka City Okazo Chome 18-1 Mitsubishi Electric Engineering Co., Ltd. Nagoya Office Shizuoka Branch (72) Inventor Hiroaki Suzuki 3-18-1 Oga, Shizuoka City Mitsubishi Electric Engineering Co., Ltd. Nagoya Office Shizuoka Branch (72) Inventor Makoto Tanigawa 3-18-1 Oga, Shizuoka City Mitsubishi Electric Engineering Co., Ltd. Furuya Plant Shizuoka Branch (72) Inventor Hitoshi Tanifuji 3-18-1 Ogashi, Shizuoka City Mitsubishi Electric Engineering Co., Ltd. Nagoya Plant Shizuoka Branch (56) Reference JP-A-5-252782 (JP, A) ) JP-A-63-28286 (JP, A) JP-A-5-236607 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02P 6/00-6/24 H02P 5 / 00 H02P 5/28-5/412 H02P 7/00-7/01 H02P 7/36-7/632 H02P 8/00

Claims (4)

(57) [Claims] 1. An actual frequency calculating means for calculating an actual frequency of a DC brushless motor drive voltage from an induced voltage of a DC brushless motor driven by an output AC voltage from an inverter circuit, an operation request from an indoor unit, and an outdoor unit. Machine
Command frequency determining means for determining a command frequency of the DC brushless motor drive voltage based on data from various sensors, and a frequency for comparing the command frequency determined by this means with the actual frequency calculated by the actual frequency calculating means. And a motor drive output voltage control means for outputting a motor drive waveform signal to the inverter circuit so that the output voltage for driving the DC brushless motor is adjusted according to the output of the frequency comparison means. Air conditioner controlled so that actual frequency and command frequency match
In the DC brushless motor drive control device for driving the compressor , the motor drive output voltage control means generates the
The magnitude of the motor drive waveform signal is determined for each frequency.
Exceeds the upper limit and the DC brushless motor drive voltage
Output voltage regulation means is installed to control the output voltage
A DC brushless motor drive controller for driving a compressor of an air conditioner, which is characterized in that 2. An output AC voltage from an inverter circuit is used.
From the induced voltage of the DC brushless motor driven by
The actual frequency of the DC brushless motor drive voltage of
Actual frequency calculation means, operation request from indoor unit and outdoor unit
DC brushless with the data from various sensors
Command frequency determination to determine command frequency of motor drive voltage
Means, the command frequency determined by this means, and the actual
Compare with the actual frequency calculated by the frequency calculation means
Depending on the frequency comparison means and the output of this frequency comparison means
The output voltage that drives the DC brushless motor is adjusted
The motor drive waveform signal to the inverter circuit
And a motor drive output voltage control means for outputting
Direct current control that controls the frequency and command frequency to match
The above-mentioned motor drives
Motor drive waveform signal generated by output voltage control means
When the magnitude of exceeds the upper limit set for each frequency
The control signal to stall the DC brushless motor is added to the above
Patent in that a stall control means for outputting to the inverter circuits
DC brushless motor drive controller for compressor drive of air conditioners . 3. The frequency comparing means compares the frequency with the actual frequency.
From the minimum change width of this command frequency to the command frequency to be compared
A dead band addition means that gives a small predetermined width
The number of command frequencies added by this dead zone adding means
The above DC brushless motor drive voltage is applied only when it is outside the specified range.
The output to be adjusted is output from the frequency comparison means to the motor.
It is characterized in that it is output to the drive output voltage control means.
A direct-flow brushless motor drive control device for driving a compressor of an air conditioner according to claim 1 or 2 . 4. An inverter circuit converts a pulse width modulated wave signal into a pulse width modulated wave signal.
Therefore, it is controlled according to any one of claims 1 to 3.
A DC brushless motor drive control device for driving a compressor of an air conditioner described therein.