WO2021048895A1 - 圧縮機駆動装置および空気調和装置 - Google Patents

圧縮機駆動装置および空気調和装置 Download PDF

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Publication number
WO2021048895A1
WO2021048895A1 PCT/JP2019/035357 JP2019035357W WO2021048895A1 WO 2021048895 A1 WO2021048895 A1 WO 2021048895A1 JP 2019035357 W JP2019035357 W JP 2019035357W WO 2021048895 A1 WO2021048895 A1 WO 2021048895A1
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Prior art keywords
compressor
energization
control unit
frequency
inverter control
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PCT/JP2019/035357
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English (en)
French (fr)
Japanese (ja)
Inventor
貴彦 小林
和徳 畠山
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Priority to JP2021544984A priority Critical patent/JP7258162B2/ja
Priority to PCT/JP2019/035357 priority patent/WO2021048895A1/ja
Publication of WO2021048895A1 publication Critical patent/WO2021048895A1/ja
Anticipated expiration legal-status Critical
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Definitions

  • the present invention relates to a compressor drive device and an air conditioner that drive a compression mechanism that compresses a refrigerant.
  • Patent Document 1 discloses a technique for heating the compressor during standby for operation in order to prevent the refrigerant from staying in the heat pump device composed of the compressor drive device.
  • the heat pump device described in Patent Document 1 determines whether or not heating of the compressor is necessary based on the amount of refrigerant sunk in the compressor while the compressor is on standby.
  • the heat pump device described in Patent Document 1 supplies a direct current to the compressor motor according to the amount of refrigerant sunk, or has a higher frequency than during normal operation.
  • the compressor is heated by selecting one of the high-frequency energizations that supply the high-frequency current.
  • Patent Document 1 When the technique described in Patent Document 1 is applied to a device having a large heat capacity of a compressor and composed of a plurality of compressors, the total amount of electric power required to heat the refrigerant inside the compressor during operation standby is increased. Increases with the number of compressors. In the case of the heating method in which high-frequency energization is performed, although the heating efficiency is high, there is a problem that noise increases when high-frequency energization is performed on a plurality of compressors at the same time.
  • Air conditioners tend to be equipped with a compressor drive device that drives a plurality of compressors in order to increase the output. Air conditioners are required to suppress noise and standby power during standby, which increases in proportion to the number of compressors.
  • the present invention has been made in view of the above, and when heating a plurality of compressors in operation standby, it is possible to suppress an increase in standby power due to direct current energization while suppressing an increase in noise due to high frequency energization.
  • the purpose is to obtain a compressor drive device.
  • the present invention compresses a compressor that is connected to a power source and includes a compressor that compresses a refrigerant and a compressor motor that operates the compression mechanism. It is a machine drive device.
  • Each compressor drive device includes a plurality of inverters that convert the electric power of the power source into a desired voltage and apply the power to the compressor motor, and an inverter control unit that generates a drive signal for driving the plurality of inverters. ..
  • the inverter control unit When heating the refrigerant inside a plurality of compressors in standby operation, the inverter control unit energizes a compressor motor included in at least one of the plurality of compressors by using a direct current.
  • DC energization or low-frequency energization which is energization using a low-frequency current with an operating frequency within the specified range, is performed, and the compressor is used for the compressor motor of other compressors among multiple compressors. It is controlled to perform high-frequency energization, which is energization using a high-frequency current having an operating frequency higher than the low-frequency current, which is a current having an operating frequency that the motor cannot follow.
  • the compressor drive device has an effect of suppressing an increase in standby power due to direct current energization while suppressing an increase in noise due to high-frequency energization when heating a plurality of compressors in operation standby. ..
  • FIG. 1 A flowchart showing a refrigerant heating operation during standby operation of the compressor drive device according to the third embodiment.
  • FIG. 1 is a diagram showing a configuration example of an air conditioner 100 including a compressor drive device 1 according to a first embodiment of the present invention.
  • the air conditioner 100 includes a compressor drive device 1 and a refrigeration cycle 30.
  • the refrigeration cycle 30 includes compressors 2a and 2b, a four-way valve 32, a heat exchanger 33a, an expansion device 34, and a heat exchanger 33b.
  • the refrigerant pipes are connected in the order of the compressors 2a and 2b, the four-way valve 32, the heat exchanger 33a, the expansion device 34, the heat exchanger 33b, the four-way valve 32, and the compressors 2a and 2b.
  • the refrigerant circuit 31 is configured by connecting each configuration via the structure.
  • the compressor 2a includes a compression mechanism 21a that compresses the refrigerant in the refrigeration cycle 30, and a compressor motor 22a that operates the compression mechanism 21a.
  • the compressor 2b includes a compression mechanism 21b that compresses the refrigerant in the refrigeration cycle 30, and a compressor motor 22b that operates the compression mechanism 21b.
  • the compressor motors 22a and 22b are three-phase motors having U-phase, V-phase, and W-phase three-phase windings. In the following description, when the compressors 2a and 2b are not distinguished, they are referred to as the compressor 2, when the compression mechanisms 21a and 21b are not distinguished, they are referred to as the compression mechanism 21, and when the compressor motors 22a and 22b are not distinguished, they are referred to as the compressor.
  • the compressors 2a and 2b are connected in parallel on the same refrigerant circuit 31.
  • the compressors 2a and 2b may be connected to different refrigerant circuits. Further, in the air conditioner 100, the number of compressors 2 is not limited to two, and may be three or more.
  • the “refrigerant” may be referred to as “liquid refrigerant”, and the same shall apply hereinafter.
  • the compressor drive device 1 targets the refrigeration cycle 30, specifically, the compressors 2a and 2b.
  • the compressor drive device 1 compresses the refrigerant flowing through the refrigerant circuit 31 of the air conditioner 100 will be described, but this is an example, and the present invention is not limited thereto.
  • the compressor drive device 1 can also target a device other than the air conditioner 100, for example, a refrigerant circuit such as a refrigerator, a dehumidifier, a water heater using a heat pump device, a drying washing machine, and a refrigerating device.
  • the configuration of the refrigeration cycle 30 shown in FIG. 1 is an example, and the present invention is not limited to this. Even if the refrigeration cycle 30 has a configuration different from that of FIG. 1, the same effect as when the compressor drive device 1 is applied to the air conditioner 100 can be obtained.
  • the compressor drive device 1 includes an inverter 11a that is electrically connected to the compressor motor 22a and drives the compressor motor 22a, and an inverter 11b that is electrically connected to the compressor motor 22b and drives the compressor motor 22b.
  • the inverter control unit 12 generates a drive signal for driving the inverters 11a and 11b and controls the inverters 11a and 11b.
  • the inverter 11a is connected to the power source 3, converts the power of the power source 3 into a desired voltage, and applies the power to the compressor motor 22a. Specifically, the inverter 11a applies a voltage Vu to the U-phase winding of the compressor motor 22a, applies a voltage Vv to the V-phase winding, and applies a voltage Vw to the W-phase winding.
  • the inverter 11b is connected to the power source 3, converts the power of the power source 3 into a desired voltage, and applies the power to the compressor motor 22b. Specifically, the inverter 11b applies a voltage Vu to the U-phase winding of the compressor motor 22b, applies a voltage Vv to the V-phase winding, and applies a voltage Vw to the W-phase winding.
  • the inverters 11a and 11b when they are not distinguished, they may be referred to as an inverter 11.
  • the power source 3 may be a DC power source including a battery, a battery, or the like, or an AC direct current power source including a well-known converter for converting AC power supplied from a three-phase or single-phase AC power source into DC power, a reactor, and a smoothing capacitor. It may be a converter.
  • the well-known converter may be a diode bridge.
  • the compressor drive device 1 has a configuration in which a booster circuit such as a well-known DC (Direct Current) -DC converter is inserted into the DC bus between the AC / DC power converter and the inverter 11 to boost the DC voltage. But it may be. Further, the compressor drive device 1 may be configured to include the above-mentioned AC / DC power converter, booster circuit, and the like.
  • FIG. 2 is a diagram showing a configuration example of an inverter 11 constituting the compressor drive device 1 according to the first embodiment. From FIG. 1, the compressor drive device 1 and the portion of the configuration connected to the compressor drive device 1 are extracted. As shown in FIG. 2, the inverters 11a and 11b have a bridge-connected switching element and a freewheeling diode connected in parallel to each of the switching elements.
  • the inverter control unit 12 that controls the inverters 11a and 11b is electrically connected to the inverters 11a and 11b.
  • the inverter control unit 12 performs control calculation, control processing, and the like for driving the inverters 11a and 11b, and PWM (Pulse Width Modulation) signals UP, VP, WP, UN, VN, which are drive signals for each inverter 11.
  • WN is generated and output to the inverters 11a and 11b.
  • the PWM signal UP drives the switching element UP1
  • the PWM signal VP drives the switching element VP1
  • the PWM signal WP drives the switching element WP1
  • the PWM signal UN drives the switching element UN1
  • the PWM signal The switching element VN1 is driven by the VN
  • the switching element WN1 is driven by the PWM signal WN.
  • the inverter 11a generates three-phase voltages Vu, Vv, and Vw applied to the U-phase, V-phase, and W-phase windings of the compressor motor 22a.
  • the PWM signal UP drives the switching element UP2
  • the PWM signal VP drives the switching element VP
  • the PWM signal WP drives the switching element WP2
  • the PWM signal UN drives the switching element UN2.
  • the switching element VN2 is driven by the VN
  • the switching element WN2 is driven by the PWM signal WN.
  • the inverter 11b generates three-phase voltages Vu, Vv, and Vw applied to the U-phase, V-phase, and W-phase windings of the compressor motor 22b.
  • the inverter control unit 12 individually controls the inverters 11a and 11b, and individually outputs a PWM signal for outputting the voltage to be output by each of the inverters 11a and 11b to the inverters 11a and 11b.
  • the inverter control unit 12 has two operation modes, a normal operation mode and a heating operation mode, as an operation mode for controlling the inverters 11a and 11b to operate the compressors 2a and 2b.
  • a normal operation mode the inverter control unit 12 generates a PWM signal as a drive signal for driving the compressor motors 22a and 22b and outputs the PWM signal to the inverters 11a and 11b.
  • the heating operation mode the inverter control unit 12 heats and compresses the compressor motors 22a and 22b by energizing the compressor motors 22a and 22b in operation standby so as not to rotate them, unlike the normal operation mode.
  • the refrigerant staying inside the machines 2a and 2b is warmed, vaporized and discharged.
  • the inverter control unit 12 utilizes the heat generated in the compressor motors 22a and 22b by passing a direct current or a high frequency current that the compressor motors 22a and 22b cannot follow in the compressor motors 22a and 22b. Then, the refrigerant staying inside the compressors 2a and 2b is heated.
  • energizing the compressor motors 22a and 22b so as not to rotate them in the heating operation mode to perform heating is referred to as restraint energization.
  • passing a direct current through the compressor motors 22a and 22b to perform restraint energization is referred to as direct current energization.
  • Direct current energization is energization using a direct current.
  • the inverter control unit 12 may perform low-frequency energization, which is energization using a low-frequency current having an operating frequency within a specified range, for the compressor motors 22a and 22b instead of direct current energization. Good. Further, passing a high-frequency current through the compressor motors 22a and 22b to perform restraint energization is called high-frequency energization.
  • the high-frequency energization is a current having an operating frequency that the compressor motor 22 cannot follow, and is an energization using a high-frequency current having an operating frequency higher than the low-frequency current.
  • the inverter control unit 12 is based on an internal calculation of the inverter control unit 12 or a signal from an upper control unit such as an external controller (not shown) that controls the air conditioner 100 while the compressors 2a and 2b are on standby for operation. Then, it is determined whether or not the compressors 2a and 2b need to be heated. When the inverter control unit 12 determines that heating is required, the inverter control unit 12 shifts to the heating operation mode and controls the compressor motors 22a and 22b so as to flow a direct current or a high frequency current that the compressor motors 22a and 22b cannot follow.
  • an upper control unit such as an external controller (not shown) that controls the air conditioner 100 while the compressors 2a and 2b are on standby for operation.
  • the drive signal based on the control is output to the inverters 11a and 11b.
  • the inverter control unit 12 determines that heating is unnecessary, the inverter control unit 12 does not output a drive signal to the inverters 11a and 11b, and maintains the operation standby state of the inverters 11a and 11b.
  • the inverter control unit 12 determines whether or not the compressors 2a and 2b need to be heated.
  • the compressors 2a and 2b have the largest heat capacity in each configuration of the refrigeration cycle 30, and the temperature is delayed with respect to an increase in the ambient temperature.
  • the inverter control unit 12 estimates the refrigerant retention state inside the compressors 2a and 2b based on the change in the ambient temperature after the compressors 2a and 2b enter the operation standby state, and the compressor 12 based on the estimation result. It suffices to judge whether or not heating to 2a and 2b is necessary.
  • the inverter control unit 12 can detect the ambient temperature by, for example, a well-known temperature sensor (not shown) provided around the compressors 2a and 2b.
  • V * is a voltage command
  • ⁇ is a voltage phase command.
  • Vu * V * ⁇ sine ⁇ ...
  • Vv * V * ⁇ sin ( ⁇ -2 ⁇ / 3)...
  • Vw * V * ⁇ sin ( ⁇ + 2 ⁇ / 3)...
  • the inverter control unit 12 calculates each voltage command Vu *, Vv *, Vw * using the equations (1) to (3) based on the voltage command V * and the voltage phase command ⁇ .
  • the inverter control unit 12 compares each voltage command Vu *, Vv *, Vw * with a carrier signal having an amplitude value of ⁇ Vdc / 2 at a specified frequency (hereinafter referred to as a reference signal), and determines the magnitude of each other. Based on the relationship, PWM signals UP, VP, WP, UN, VN, WN are generated.
  • Vdc is a voltage on the DC bus side corresponding to the power source 3 side when viewed from the inverters 11a and 11b.
  • the inverter control unit 12 obtains each voltage command Vu *, Vv *, Vw * by a simple trigonometric function using equations (1) to (3), but two-phase modulation other than the above-mentioned method. , Third-order harmonic modulation, spatial vector modulation, and other methods may be used to obtain the respective voltage commands Vu *, Vv *, and Vw *.
  • the inverter 11a will be described as an example.
  • the PWM signal UP is a drive signal that turns on the switching element UP1
  • the PWM signal UN is a drive signal that turns off the switching element UN1.
  • the PWM signal UP is a drive signal that turns off the switching element UP1
  • the PWM signal UN is a drive signal that turns on the switching element UN1.
  • the PWM signals VP and VN are determined by comparing the voltage command Vv * with the carrier signal
  • the PWM signal WP by comparing the voltage command Vw * with the carrier signal.
  • WN is determined.
  • a general inverter adopts a complementary PWM method, and in the inverter 11, the PWM signal UP and the PWM signal UN, the PWM signal VP and the PWM signal VN, and the PWM signal WP and the PWM signal WN have a well-known short-circuit prevention time. Excluding them, they ideally have a logically inverted relationship with each other.
  • the well-known short-circuit prevention time is a period during which the P-side and N-side switching elements of the same phase are turned off at the same time, that is, a dead time. Therefore, in the inverter 11, there are a total of eight switching patterns for each switching element.
  • FIG. 3 is a diagram showing eight switching patterns in the inverters 11a and 11b of the compressor drive device 1 according to the first embodiment.
  • the signal when the corresponding switching element is turned on is set to "1"
  • the signal when the corresponding switching element is turned off is set to "0".
  • the voltage vectors generated in each switching pattern are designated by V0 to V7.
  • the voltage direction of each voltage vector is represented by ⁇ U, ⁇ V, ⁇ W, and is represented by 0 when no voltage is generated.
  • + U is a voltage that generates a current in the + U phase direction that flows into the compressor motor 22 via the U phase and flows out from the compressor motor 22 via the V phase and the W phase.
  • —U is a voltage that generates a current in the ⁇ U phase direction that flows into the compressor motor 22 via the V phase and the W phase and flows out from the compressor motor 22 via the U phase. The same applies to ⁇ V and ⁇ W.
  • the compressor drive device 1 can output a desired voltage from the inverters 11a and 11b and apply a voltage to the compressor motors 22a and 22b by combining the switching patterns shown in FIG.
  • the compressor drive device 1 is generally operated in a range of several Hz to several kHz in a normal operation mode in which a normal compression operation is performed, for example.
  • the compressor drive device 1 can perform direct current energization in the heating operation mode by setting the voltage phase command ⁇ to a fixed value as described later. Further, the compressor drive device 1 inverts the voltage phase command ⁇ by 180 ° in synchronization with the frequency of the carrier signal of the inverter 11 (hereinafter referred to as the carrier frequency), or makes the voltage phase command ⁇ faster than the normal operation mode.
  • the carrier frequency the frequency of the carrier signal of the inverter 11
  • FIG. 4 is a diagram showing an example of each signal waveform when the compressor drive device 1 according to the first embodiment is energized with direct current.
  • the inverters 11a and 11b turn on and off the switching element according to the PWM signals UP, VP, WP, UN, VN, WN, and the voltage vectors V0 (0 voltage), V1 (+ W voltage), V5 ( ⁇ V voltage) shown in FIG. , V7 (0 voltage) is output.
  • the inverters 11a and 11b flow into the compressor motors 22a and 22b through the W phase on average with respect to the compressor motors 22a and 22b, and flow out from the compressor motors 22a and 22b via the V phase. It is possible to pass a direct current that does.
  • two of the three phases, here the V phase and the W phase are the energized phases, and the remaining one phase, here the U phase, is the non-energized phase.
  • the inverter control unit 12 can uniformly heat the compressor motors 22a and 22b without being biased to a specific portion by sequentially changing the voltage phase command ⁇ with the passage of time.
  • the inverter control unit 12 may set the value of the voltage phase command ⁇ to an integral multiple of 60 °, and the non-energized phase can be sequentially transitioned. It is possible to suppress uneven heat generation due to the parts of the compressor motors 22a and 22b.
  • the inverter control unit 12 controls so that two of the three phases are energized phases, the remaining one phase is a non-energized phase, and the phases that become non-energized phases are exchanged.
  • FIG. 5 is a diagram showing an example of each signal waveform when the compressor drive device 1 according to the first embodiment is energized with high frequency.
  • FIG. 5 shows an example in which high frequency energization equal to the carrier frequency is performed by inversion of the voltage phase command ⁇ by 180 °, that is, ⁇ in synchronization with the carrier frequency.
  • the three-phase voltage commands Vu *, Vv *, Vw * for the U phase, the V phase, and the W phase can be expressed as equations (4) to (6).
  • Vu * V * ⁇ sine ⁇ ... (4)
  • Vv * V * ⁇ sin ( ⁇ + ⁇ )... (5)
  • Vw * V * ⁇ sin ( ⁇ + ⁇ )... (6)
  • the inverter control unit 12 can obtain voltage commands Vu *, Vv *, and Vw * that are inverted in synchronization with the carrier signal.
  • the inverters 11a and 11b turn on and off the switching element according to the PWM signals UP, VP, WP, UN, VN, WN, and the voltage vectors V0 (0 voltage), V4 (+ U voltage), V7 (0 voltage), shown in FIG. It changes in the order of V3 (-U voltage) and V0 (0 voltage), and outputs a voltage in which this change is repeated.
  • FIG. 6 is a diagram showing a change in the voltage vector when the compressor drive device 1 according to the first embodiment is energized at a high frequency, and an on / off state of each switching element of the inverter 11 corresponding to each voltage vector.
  • the switching element circled by the broken line is on, and the other switching elements are off.
  • the rotation direction of the thick arrow indicating the order of change of the voltage vector that is, the rotation direction of the voltage vector V0 ⁇ V4 ⁇ V7 ⁇ V3 ⁇ V0 corresponds to the example of FIG.
  • the inverter control unit 12 generates PWM signals UP, VP, WP, UN, VN, and WN so as to transition the four circuit states shown in FIG. 6 in one carrier cycle.
  • the inverter control unit 12 can pass a high-frequency current having one carrier cycle as one cycle to the compressor motors 22a and 22b via the inverters 11a and 11b.
  • the current (-Iu) in the -U phase direction that flows into the compressor motors 22a and 22b via the V phase and the W phase and flows out from the compressor motors 22a and 22b via the U phase is compressed. It flows through the windings of the machine motors 22a and 22b.
  • the magnitude of the current flowing in the U phase is twice the magnitude of the current flowing in the other V phase and the W phase, and the high frequency current flows mainly in the U phase.
  • the voltage of the V4 vector and the voltage of the V3 vector are alternately output from the inverters 11a and 11b, and the current in the + U phase direction (+ Iu) and the current in the ⁇ U phase direction ( ⁇ Iu) are alternately output from the compressor motor 22a.
  • the forward and reverse torques are switched instantly. Therefore, the forward and reverse torques are canceled out, and the inverter control unit 12 can apply a voltage that suppresses the vibration of the rotor.
  • the inverter control unit 12 is repeatedly changed in the order of, for example, V0 (0 voltage), V2 (+ V voltage), V7 (0 voltage), V5 (-V voltage), and V0 (0 voltage) from the inverters 11a and 11b. By controlling the voltage to be output, a high-frequency current can be mainly passed through the V phase. Further, the inverter control unit 12 repeatedly changes the inverter 11a, for example, in the order of V0 (0 voltage), V1 (+ W voltage), V7 (0 voltage), V6 ( ⁇ W voltage), V0 (0 voltage). By controlling the voltage to be output from 11b, a high frequency current can be mainly passed through the W phase.
  • the inverter control unit 12 can uniformly heat the compressors 2a and 2b without being biased to a specific portion by appropriately changing the selection operation of a series of voltage vectors.
  • the inverter control unit 12 has equations (1) to (3) representing the three-phase voltage commands Vu *, Vv *, and Vw * described above.
  • the voltage phase command ⁇ in the above may be continuously changed in the range of 0 ° to 360 ° to shorten the changing period, thereby increasing the frequency of the high frequency voltage and performing high frequency energization.
  • the inverter control unit 12 When the inverter control unit 12 continuously changes the voltage phase command ⁇ in the equations (1) to (3) in the range of 0 ° to 360 ° at high speed, the voltage commands Vu *, Vv *, and Vw * are changed. Each becomes a sine wave with a phase difference of 120 °.
  • the inverter control unit 12 obtains PWM signals UP, VP, WP, UN, VN, WN by comparing each voltage command Vu *, Vv *, Vw * with a reference signal, and the voltage vector changes with time. Since it changes, it becomes possible to pass a high frequency current through the compressor motors 22a and 22b. In this method, since the three-phase current is balanced and the high-frequency current flows, the inverter control unit 12 can uniformly heat the compressors 2a and 2b without being biased to a specific portion.
  • the inverter control unit 12 can realize low frequency energization by lengthening the period in which the voltage phase command ⁇ changes.
  • the resistance component becomes dominant in the impedance components of the compressor motors 22a and 22b, so that the heating effect due to low frequency energization becomes equivalent to the heating effect due to direct current energization.
  • the frequency component of the sound caused by the constrained energization is mainly a component related to the carrier frequency, a component related to the frequency of the high frequency voltage of the high frequency energization, a component related to the frequency of the low frequency voltage of the low frequency energization, and the like.
  • the component related to the frequency of the high frequency voltage of the high frequency energization and the component related to the frequency of the low frequency voltage of the low frequency energization are, that is, the components related to the frequency that changes the voltage phase command ⁇ .
  • the upper limit of the carrier frequency is determined by the switching speed of the switching element of the inverter.
  • the upper limit of the switching speed is about 20 kHz in the case of the well-known IGBT (Insulated Gate Bipolar Transistor), and several hundred kHz in the case of SiC, GaN, and diamond, which are wide-gap semiconductors.
  • the upper limit of the human audible frequency is set. It is desirable that the frequency exceeds 20 kHz.
  • the upper limit of the switching speed is about 20 kHz, and it is difficult to set the switching speed to exceed the upper limit of the human audible frequency. Therefore, the setting is set to 5 kHz to 20 kHz.
  • the frequency of the high-frequency voltage that is, the frequency at which the voltage phase command ⁇ is changed is 1/10 of the carrier frequency. If it exceeds the level, the waveform output accuracy of the high frequency voltage deteriorates, and there is a risk that DC components will be superimposed.
  • the frequency of the high frequency voltage is 1/10 or less of the carrier frequency, for example, when the carrier frequency is 20 kHz, the frequency of the high frequency voltage is 2 kHz or less, and the frequency of the high frequency voltage is within the audible frequency band.
  • the frequency is in the range of 1 kHz to 5 kHz, which is particularly sensitive, there is a concern about noise due to the electromagnetic noise of the compressor motor.
  • the carrier frequency can be raised to several hundred kHz, and even if the frequency of the high frequency voltage is 1/10 or less of the carrier frequency, it can be set to several tens of kHz. From this, the high-frequency energization method based on the equations (1) to (3) is suitable when a wide-gap semiconductor is used for the switching element of the inverter that can set the frequency of the high-frequency voltage outside the audible frequency band.
  • low frequency energization preferably 1 kHz or less on the lower limit side, which is particularly sensitive, and more preferably 20 Hz or less, which is lower than the lower limit of human audible frequency, are suitable.
  • the operating frequency in DC energization or low frequency energization is 0 Hz or more and less than 1 kHz, and the operating frequency in high frequency energization is 5 kHz or more.
  • the operating frequency is 0 Hz in the case of direct current energization, and the range is larger than 0 Hz and less than 1 kHz in the case of low frequency energization.
  • the total amount of electric power required to heat the refrigerant inside the compressor during operation standby is proportional to the number of compressors when performing restraint energization. Will increase.
  • the heating efficiency is high, but when a high-frequency voltage is applied to a plurality of compressors at the same time, the amount of high-frequency power generated and noise also increase and exist outside the device. There is a risk of noise affecting other devices.
  • the inverter control unit 12 passes a direct current through the compressor motors 22a and 22b to square the magnitude of the direct current and the windings constituting each of the compressor motors 22a and 22b.
  • a copper loss proportional to the resistance value is generated in the windings of the compressor motors 22a and 22b, and the refrigerant staying inside the compressors 2a and 2b can be heated by the heat generated by the copper loss.
  • the inverter control unit 12 can control the amount of heat generated by controlling the magnitude of the current flowing through the compressor motors 22a and 22b by using the inverters 11a and 11b.
  • a large current, that is, a large calorific value can be obtained at a low voltage, and the refrigerant retained inside the compressors 2a and 2b can be discharged in a short time.
  • DC energization is not an energization method suitable for heating a number of compressors with refrigerant at the same time for a long time during standby operation.
  • the inverter control unit 12 is a material such as a stator and a rotor constituting the compressor motors 22a and 22b by passing a high-frequency current from the inverters 11a and 11b to the compressors 2a and 2b. Iron losses such as eddy current loss and hysteresis loss can be generated in the magnetic material, and the refrigerant retained inside the compressors 2a and 2b can be heated.
  • the inverter control unit 12 can increase the iron loss and increase the amount of heat generated by increasing the frequency of the high-frequency current, and further increase the impedance due to the inductance of the compressor motors 22a and 22b. Can be done. Therefore, the inverter control unit 12 can suppress the high-frequency current, reduce the loss of the inverters 11a and 11b, and enable highly efficient heating of the refrigerant retained inside the compressors 2a and 2b.
  • High-frequency energization is an energization method that has a small standby power and is suitable for heating the refrigerant for a long time during standby operation.
  • the heating efficiency is high, when a high-frequency voltage is applied to a plurality of compressors 2 at the same time, the amount of high-frequency power generated and noise also increase, and other devices existing outside the device, especially electronic devices, are affected. On the other hand, there is a risk of being affected by noise. Further, when the compressor motors 22a and 22b having a small iron loss are used, the calorific value becomes small, and there are cases where the calorific value required for warming and vaporizing the retained refrigerant and discharging the refrigerant cannot be obtained.
  • the inverter control unit 12 heats a plurality of compressors 2 at the same time by the same energization method in either the DC energization method or the high frequency energization method, the above-mentioned problems occur. From this, when a plurality of compressors 2 are heated by restraint energization, for example, when the compressor 2a is heated by direct current energization using the inverter 11a, the inverter control unit 12 compresses by using the inverter 11b in parallel. The machine 2b is controlled to be heated by high frequency energization.
  • the inverter control unit 12 makes the energization method different for each compressor 2.
  • the inverter control unit 12 can appropriately obtain the merits of each of the two energization methods, and can reduce the influence on the problems of each method.
  • the direct current energization may be replaced with the above-mentioned low frequency energization that can obtain the same heating effect.
  • the inverter control unit 12 heats at least one compressor 2 by direct current energization, and at least one of the remaining compressors 2 is energized by high frequency. Heat.
  • the inverter control unit 12 heats the remaining compressor 2 with high-frequency energization if the influence of efficiency is dominant, and heats with direct current energization if the influence of noise is dominant.
  • the restraint energization method may be individually selected in consideration of the balance between the above. A preferred embodiment when the number of such compressors 2 is 3 or more will be described later.
  • the inverter control unit 12 heats the compressor 2a with direct current, for example, using the inverter 11a, and in parallel, the compressor using the inverter 11b. Heating 2b with high-frequency energization is carried out for a predetermined period T1, and the restraint energization method is replaced after the elapse of the period T1.
  • the inverter control unit 12 then uses the inverter 11a to heat the compressor 2a with high-frequency energization, and in parallel, heats the compressor 2b with the inverter 11b with direct current energization during the period T1. carry out.
  • the inverter control unit 12 controls each compressor 2 so as to alternately perform DC energization or low frequency energization and high frequency energization.
  • the inverter control unit 12 can make the total amount of heat generated in each compressor 2 the same, so that the heating amount of each compressor 2 can be averaged, and the refrigerant can be heated without variation for each compressor 2. Become.
  • FIG. 7 is a flowchart showing a refrigerant heating operation during operation standby of the compressor drive device 1 according to the first embodiment.
  • the inverter control unit 12 heats the compressors 2a and 2b based on a signal from an external upper control unit such as an internal calculation or a controller that controls the air conditioner 100. Is necessary or not (step S1).
  • the inverter control unit 12 determines that heating is unnecessary (step S1: No)
  • the inverter control unit 12 maintains the operation standby state of the compressors 2a and 2b.
  • step S1 When the inverter control unit 12 determines that heating is necessary (step S1: Yes), the inverter control unit 12 shifts to the heating operation mode, and uses the inverter 11a as the first restraint energization to the compressor 2a, which is the first compressor. DC energization is started, and in parallel, high-frequency energization is started in the compressor 2b, which is the second compressor, using the inverter 11b (step S2).
  • the inverter control unit 12 determines whether or not a predetermined period T1 has elapsed after the start of the first restraint energization (step S3). When the predetermined period T1 has not elapsed (step S3: No), the inverter control unit 12 maintains the state of the first restraint energization. During the period T1, the inverter control unit 12 appropriately changes the selection operation of a series of voltage vectors in high-frequency energization as described above, and sequentially changes the voltage phase command ⁇ with the passage of time in DC energization.
  • the compressors 2a and 2b are heated uniformly without being biased to a specific portion.
  • the inverter control unit 12 stops the first restraint energization, that is, direct current energization to the compressor 2a using the inverter 11a and the inverter 11b.
  • the high-frequency energization of the used compressor 2b is stopped (step S4).
  • the inverter control unit 12 starts high-frequency energization of the compressor 2a, which is the first compressor, using the inverter 11a, and in parallel, the second compressor uses the inverter 11b.
  • DC energization is started in a certain compressor 2b (step S5).
  • the inverter control unit 12 determines whether or not a predetermined period T1 has elapsed after the start of the second restraint energization (step S6). When the predetermined period T1 has not elapsed (step S6: No), the inverter control unit 12 maintains the state of the second restraint energization. During the period T1, the inverter control unit 12 appropriately changes the selection operation of a series of voltage vectors in high-frequency energization as described above, and sequentially changes the voltage phase command ⁇ with the passage of time in DC energization.
  • the compressors 2a and 2b are heated uniformly without being biased to a specific portion.
  • step S6 the inverter control unit 12 stops the second restraint energization, that is, energizes the compressor 2a using the inverter 11a with high frequency, and turns the inverter 11b on.
  • the direct current energization of the used compressor 2b is stopped (step S7). If the inverter control unit 12 does not shift to the normal operation mode, the inverter control unit 12 returns to step S1 and repeats the same operation as described above.
  • the inverter control unit 12 controls so that the execution period of DC energization or low frequency energization is the same as the implementation period of high frequency energization.
  • the above is an explanation of a series of flows in the refrigerant heating operation processing during the operation standby of the compressor drive device 1.
  • the inverter control unit 12 may replace the direct current energization with the above-mentioned low frequency energization that can obtain the same heating effect.
  • the inverter control unit 12 when the inverter control unit 12 heats the refrigerant inside the plurality of compressors 2 in the operation standby, the inverter control unit 12 refers to the compressor motor 22 included in at least one of the plurality of compressors 2. , DC energization using direct current or low frequency energization using low frequency current, and high frequency energization using high frequency current to the compressor motor of other compressors among multiple compressors. To control.
  • FIG. 8 is a diagram showing an example of a hardware configuration that realizes the inverter control unit 12 included in the compressor drive device 1 according to the first embodiment.
  • the inverter control unit 12 is realized by the processor 201 and the memory 202.
  • the processor 201 is a CPU (Central Processing Unit, central processing unit, processing unit, arithmetic unit, microprocessor, microcomputer, processor, DSP (Digital Signal Processor)), or system LSI (Large Scale Integration).
  • the memory 202 is non-volatile or volatile such as RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EPROM (Erasable Programmable Read Only Memory), and EEPROM (registered trademark) (Electrically Erasable Programmable Read-Only Memory).
  • RAM Random Access Memory
  • ROM Read Only Memory
  • flash memory EPROM (Erasable Programmable Read Only Memory)
  • EEPROM registered trademark
  • the semiconductor memory of the above can be illustrated.
  • the memory 202 is not limited to these, and may be a magnetic disk, an optical disk, a compact disk, a mini disk, or a DVD (Digital Versatile Disc).
  • the inverter control unit 12 heats a plurality of compressors 2 while the compressor 2 is on standby to prevent the refrigerant from staying.
  • the compressor drive device 1 is connected to a plurality of compressors 2, it suppresses an increase in noise due to high-frequency energization due to an increase in the number of compressors 2, and is a self-device or another device caused by noise. It is possible to prevent malfunctions and suppress an increase in standby power due to direct current energization.
  • the inverter control unit 12 can average the heating amount of each compressor 2 by alternately performing direct current energization and high frequency energization for the same compressor 2, and the amount of heating varies from compressor to compressor 2. No refrigerant heating can be performed.
  • Embodiment 2 when the inverter control unit 12 simultaneously performs restraint energization on the two compressors 2, the period of high-frequency energization and the period of direct current energization are the same period T1.
  • the second embodiment while direct current energization can obtain a large amount of heat generation in a short time, it does not contribute to the heating of the compressor 2, and the inverter loss that increases in proportion to the energization current is large, which is not suitable for long-term energization.
  • the period of direct current energization for the period T1 of high frequency energization is shorter than the period T1.
  • FIG. 9 is a flowchart showing a refrigerant heating operation during operation standby of the compressor drive device 1 according to the second embodiment.
  • the inverter control unit 12 heats the compressors 2a and 2b based on a signal from an external upper control unit such as an internal calculation or a controller that controls the air conditioner 100. Is necessary or not (step S11).
  • step S11 the inverter control unit 12 determines that heating is unnecessary (step S11: No)
  • the inverter control unit 12 maintains the operation standby state of the compressors 2a and 2b.
  • step S11 When the inverter control unit 12 determines that heating is necessary (step S11: Yes), the inverter control unit 12 shifts to the heating operation mode, and uses the inverter 11a to send the compressor 2a, which is the first compressor, as the first restraint energization.
  • DC energization is started, and in parallel, high-frequency energization is started in the compressor 2b, which is the second compressor, using the inverter 11b (step S12).
  • the inverter control unit 12 determines whether or not a predetermined period T0 has elapsed after the start of the first restraint energization (step S13).
  • the period T0 is shorter than the above-mentioned period T1.
  • the inverter control unit 12 maintains the state of the first restraint energization.
  • the inverter control unit 12 heats the compressor 2a uniformly without being biased to a specific portion by sequentially changing the voltage phase command ⁇ with the passage of time in DC energization as described above during the period T0.
  • the predetermined period T0 elapses (step S13: Yes)
  • the inverter control unit 12 stops the direct current energization of the compressor 2a, which is the first compressor using the inverter 11a (step S14).
  • the inverter control unit 12 determines whether or not the predetermined period T1 has elapsed (step S15). When the predetermined period T1 has not elapsed (step S15: No), the inverter control unit 12 maintains a state of high-frequency energization of the compressor 2b using the inverter 11b. During the period T1, the inverter control unit 12 appropriately heats the compressor 2b without being biased to a specific portion by appropriately changing the selection operation of a series of voltage vectors in high-frequency energization as described above.
  • step S15 the inverter control unit 12 stops the high-frequency energization of the compressor 2b, which is the second compressor using the inverter 11b (step S16).
  • step S16 the inverter control unit 12 starts high-frequency energization of the compressor 2a, which is the first compressor, using the inverter 11a, and in parallel, the second compressor uses the inverter 11b.
  • DC energization is started in a certain compressor 2b (step S17).
  • the inverter control unit 12 determines whether or not a predetermined period T0 has elapsed after the start of the second restraint energization (step S18). When the predetermined period T0 has not elapsed (step S18: No), the inverter control unit 12 maintains the state of the second restraint energization. As described above, the inverter control unit 12 heats the compressor 2b uniformly without being biased to a specific portion by sequentially changing the voltage phase command ⁇ with the passage of time in DC energization as described above during the period T0. When the predetermined period T0 elapses (step S18: Yes), the inverter control unit 12 stops the direct current energization of the compressor 2b, which is the second compressor using the inverter 11b (step S19).
  • the inverter control unit 12 determines whether or not the predetermined period T1 has elapsed (step S20). When the predetermined period T1 has not elapsed (step S20: No), the inverter control unit 12 maintains a state of high-frequency energization of the compressor 2a using the inverter 11a. During the period T1, the inverter control unit 12 appropriately heats the compressor 2a without being biased to a specific portion by appropriately changing the selection operation of a series of voltage vectors in high-frequency energization as described above.
  • step S20 When the predetermined period T1 elapses (step S20: Yes), the inverter control unit 12 stops high-frequency energization of the compressor 2a, which is the first compressor using the inverter 11a (step S21). If the inverter control unit 12 does not shift to the normal operation mode, the inverter control unit 12 returns to step S11 and repeats the same operation as described above.
  • the inverter control unit 12 controls so that the execution period of DC energization or low frequency energization is shorter than the implementation period of high frequency energization.
  • the above is an explanation of a series of flows in the refrigerant heating operation processing during the operation standby of the compressor drive device 1.
  • the inverter control unit 12 may replace the direct current energization with the above-mentioned low frequency energization that can obtain the same heating effect.
  • the inverter control unit 12 heats a plurality of compressors 2 while the compressor 2 is on standby to prevent the refrigerant from staying.
  • a plurality of compressors 2 are heated at the same time by different restraint energization methods, but the period of direct current energization is shortened with respect to high frequency energization.
  • the compressor drive device 1 can shorten the time of direct current energization, which has a feature of having a problem in heating efficiency, prevent heating exceeding a required heating amount, and suppress an increase in standby power.
  • Embodiment 3 In the first and second embodiments, the case where the compressor driving device 1 is specifically connected to two compressors 2 has been described. In the third embodiment, a case where the compressor driving device is connected to three or more compressors 2 will be described.
  • FIG. 10 is a diagram showing a configuration example of an inverter 11 constituting the compressor drive device 1a according to the third embodiment.
  • the compressor drive device 1a includes an inverter 11a, 11b, an inverter 11c that is electrically connected to the compressor motor 22c to drive the compressor motor 22c, an inverter control unit 12a that controls the inverters 11a, 11b, and 11c.
  • the compressor drive device 1a is a compressor drive device provided by an air conditioner (not shown) including three compressors 2.
  • FIG. 10 shows an example of a compressor driving device 1a connected to three compressors 2. As shown in FIG.
  • the inverters 11a, 11b, 11c have a bridge-connected switching element and a freewheeling diode connected in parallel to each of the switching elements. Further, the inverters 11a, 11b, 11c are connected to the power source 3. The inverter 11c has the same configuration as the inverters 11a and 11b. Further, the compressor motor 22c connected to the inverter 11c has the same configuration as the compressor motors 22a and 22b.
  • the inverter 11 when the inverters 11a, 11b, 11c are not distinguished, the inverter 11 is referred to, and when the compressor motors 22a, 22b, 22c are not distinguished, the compressor motor 22 is referred to. Further, for convenience of explanation, a compressor 2 (not shown) including the compressor motor 22c is referred to as a compressor 2c. When the compressors 2a, 2b, and 2c are not distinguished, they may be referred to as the compressor 2.
  • the voltage detection unit 4 for measuring the bus voltage on the DC bus that is, the voltage of the power source 3
  • the current detection unit for detecting the bus current Although an example in which 5 is connected to the compressor drive device 1a is shown, the configuration for obtaining the power output from the power source 3 is not limited to the example of FIG. Further, in FIG. 10, the current detection unit 5 may be connected to the positive side of the generatrix instead of the negative side of the generatrix.
  • the inverter control unit 12a when three or more compressors 2 are connected to the compressor driving device 1a and the inverter control unit 12a heats the refrigerant inside the compressor 2 while the compressor 2 is on standby for operation, the inverter control unit 12a is described as follows. Such control is performed. That is, the inverter control unit 12a controls the compressor motor 22 provided in one compressor 2 among the plurality of compressors 2 so as to carry out direct current energization. Further, the inverter control unit 12a controls the compressor motor 22 provided in the other compressor 2 so as to carry out high-frequency energization. Further, the inverter control unit 12a controls the compressor motor 22 provided in the remaining compressor 2 so as to select the energization method based on the electric power output from the power source 3.
  • FIG. 11 is a flowchart showing a refrigerant heating operation during operation standby of the compressor drive device 1a according to the third embodiment.
  • the inverter control unit 12a is based on a signal from an external higher control unit such as an internal calculation or a controller that controls the air conditioner 100, and the compressors 2a, 2b, It is determined whether or not heating to 2c is necessary (step S31).
  • the inverter control unit 12a determines that heating is unnecessary (step S31: No)
  • the inverter control unit 12a maintains the operation standby state of the compressors 2a, 2b, and 2c.
  • step S31 When the inverter control unit 12a determines that heating is necessary (step S31: Yes), the inverter control unit 12a shifts to the heating operation mode, and uses the inverter 11a to send the compressor 2a, which is the first compressor, as the first restraint energization.
  • DC energization is started, and in parallel, the inverter 11b is used to start high-frequency energization of the second compressor, the compressor 2b, and the inverter 11c is used to energize the third compressor, the compressor 2c. Is started (step S32).
  • the inverter control unit 12a gives priority to high efficiency, that is, control to reduce standby power by using one compressor 2 for direct current energization and two compressors 2 for high frequency energization.
  • the inverter control unit 12a increases the power used for restraint energization up to the permissible standby power and generates heat. You may try to increase the amount.
  • the inverter control unit 12a may change one of the two compressors that perform high-frequency energization to direct current energization.
  • the inverter control unit 12a After shifting to the heating operation mode, the inverter control unit 12a obtains the output power, which is the power output from the power source 3, and compares the output power of the power source 3 with the allowable power W0 (step S33). The inverter control unit 12a captures the output power of the power source 3 from the voltage value of the power source 3 which is the bus voltage detected by the voltage detection unit 4 and the value of the bus current detected by the current detection unit 5. , Can be obtained by performing arithmetic processing. The inverter control unit 12a may be provided with a measurement unit on the output side of each inverter 11 and may use the measurement result of the electric power used in the restraint energization.
  • step S33: Yes When the output power of the power source 3 is smaller than the allowable power W0 (step S33: Yes), the inverter control unit 12a changes the high-frequency energization of the compressor 2b by the inverter 11b to DC energization (step S34). In the case of step S33: Yes, the inverter control unit 12a may change the high-frequency energization of the compressor 2c by the inverter 11c to DC energization.
  • the inverter control unit 12a may return the DC energization of the inverter 11b to the compressor 2b to the high frequency energization again.
  • a margin may be provided in the value of the power W0 so that there is no problem even if the power W0 is exceeded by changing in advance.
  • the inverter control unit 12a determines whether or not a predetermined period T1 has elapsed after the start of the first restraint energization (step S35). When the predetermined period T1 has not elapsed (step S35: No), the inverter control unit 12a maintains the state of the first restraint energization. When the predetermined period T1 has elapsed (step S35: Yes), the inverter control unit 12a stops the first restraint energization (step S36). The inverter control unit 12a uses the time point of step S32 after shifting to the heating operation mode as a reference for the period T1, but may use the time point of step S34 as which the energization method is changed as a reference.
  • the inverter control unit 12a appropriately changes the selection operation of a series of voltage vectors in high-frequency energization as described above, and sequentially changes the voltage phase command ⁇ with the passage of time in DC energization.
  • the compressors 2a, 2b, and 2c are uniformly heated without being biased to a specific portion.
  • the flowchart shown in FIG. 11 describes from the start of the first restraint energization to the process of stopping the restraint energization after the lapse of the period T1, but the present invention is not limited to this.
  • the inverter control unit 12a repeats the flowchart shown in FIG. 11 by exchanging the restraint energization method for each compressor for the purpose of averaging the heating amount of each compressor as in the first and second embodiments. It may be carried out.
  • the inverter control unit 12a starts DC energization to the compressor 2b, which is the second compressor, by using the inverter 11b as the second restraint energization, and in parallel. Then, the inverter 11c is used to start high-frequency energization of the compressor 2c, which is the third compressor, and the inverter 11a is used to start high-frequency energization of the compressor 2a, which is the first compressor. Further, the inverter control unit 12a sets the change target to the compressor 2c, which is the third compressor, in step S34.
  • step S32 of the processing of the third flowchart the inverter control unit 12a starts DC energization to the compressor 2c, which is the third compressor, using the inverter 11c as the third restraint energization, and parallel Then, the inverter 11a is used to start high-frequency energization of the compressor 2a, which is the first compressor, and the inverter 11b is used to start high-frequency energization of the compressor 2b, which is the second compressor. Further, the inverter control unit 12a sets the change target to the compressor 2a, which is the first compressor, in step S34.
  • the inverter control unit 12a energizes the compressor motor 22 included in one of the plurality of compressors 2 by direct current or has a low frequency. Energize.
  • the inverter control unit 12a simultaneously performs high-frequency energization on the compressor motor 22 included in the other compressor 2, and the electric power output from the power source 3 for the compressor motor 22 included in the remaining compressor 2. Select the energization method based on.
  • the above is an explanation of a series of flows in the refrigerant heating operation processing during the operation standby of the compressor drive device 1a.
  • the inverter control unit 12a may be replaced with the above-mentioned low-frequency energization that can obtain the same heating effect for the direct current energization.
  • the inverter control unit 12a gives priority to the amount of heat generated, and has two compressors 2 for direct current energization and one compressor 2 for high-frequency energization, and is the output power of the power source 3 and the permissible power during restraint energization.
  • the number of each energization method may be adjusted in comparison with W0.
  • the inverter control unit 12a has a configuration of four or more compressors 2, for example, two compressors 2 for direct current energization and a compressor 2 for high frequency energization can be used to determine the state at the time of transition to the heating operation mode.
  • the number of each energization method may be adjusted by comparing the output power of the power source 3 at the time of restraint energization with the permissible power W0.
  • the inverter control unit 12a is subject to restraint energization when there are three or more compressors 2 connected to the compressor drive device 1a. It is possible to secure the maximum amount of heat generated by the restraint energization of each compressor 2 within the range of the allowable standby power for the required power.
  • Embodiment 4 In the fourth embodiment, the case where the compressor motor 22 connected to the compressor drive device is an independent winding type motor will be described.
  • the independent winding type motor is suitable for increasing the capacity of the compressor 2 because a higher voltage is applied and the motor output can be increased as compared with the compressor motor driven by one inverter described above. There is.
  • the increase in capacity of the independent winding type motor the total amount of electric power required for heating the refrigerant inside the compressor during operation standby and the noise also increase, and these problems tend to become remarkable. Become.
  • FIG. 12 shows a configuration example of the compressor drive device 1b and the compressor motors 22d, 22e when the compressor motors 22d, 22e connected to the compressor drive device 1b according to the fourth embodiment are independent winding type motors. It is a figure which shows.
  • the compressor drive device 1b is electrically connected to the compressor motor 22d and is electrically connected to the inverters 11a and 11b for driving the compressor motor 22d, and an inverter electrically connected to the compressor motor 22e to drive the compressor motor 22e. It includes 11c and 11d, and an inverter control unit 12b that controls the inverters 11a, 11b, 11c and 11d.
  • the compressor drive device 1b is a compressor drive device provided by an air conditioner (not shown) including two compressors 2.
  • the inverters 11a, 11b, 11c, 11d have a bridge-connected switching element and a freewheeling diode connected in parallel to each of the switching elements. Further, the inverters 11a, 11b, 11c, 11d are connected to the power source 3. The inverter 11d has the same configuration as the inverters 11a, 11b, 11c.
  • inverters 11a, 11b, 11c, and 11d when the inverters 11a, 11b, 11c, and 11d are not distinguished, they are referred to as an inverter 11, and when the compressor motors 22d and 22e are not distinguished, they are referred to as a compressor motor 22. Further, for convenience of explanation, the compressor 2 not shown with the compressor motor 22d is referred to as the compressor 2d, and the compressor 2 not shown with the compressor motor 22e is referred to as the compressor 2e. When the compressors 2d and 2e are not distinguished, they may be referred to as the compressor 2.
  • the compressor motor 22d is an independent winding type motor in which both ends of the windings of each of the U phase, V phase, and W phase are opened, and inverters 11a and 11b are individually connected to both ends of each winding.
  • the compressor motor 22e is an independent winding type motor in which both ends of the windings of the U-phase, V-phase, and W-phase are opened, and inverters 11c and 11d are individually connected to both ends of each winding.
  • the inverters 11a and 11b are connected to both ends of the winding of the compressor motor 22d which is an independent winding type motor, and the inverters 11c and 11d are the compressor motors 22e which are independent winding type motors. It is connected to both ends of the winding.
  • the inverter control unit 12b controls the inverters 11a, 11b, 11c, 11d.
  • the inverter control unit 12b uses two inverters 11 to drive one compressor motor 22. Specifically, the inverter control unit 12b uses the inverters 11a and 11b to drive the compressor motor 22d, and the inverters 11c and 11d to drive the compressor motor 22e.
  • the inverter control unit 12b receives the combined voltage of the two inverters 11 connected to both ends. Considering that it is applied to the compressor motors 22d and 22e, the following control is performed in both cases of direct current energization and high frequency energization.
  • the inverter control unit 12b when the compressor motor 22d is constrained by the inverter control unit 12b, one of the inverters 11a is operated in the same manner as in the above-described embodiment according to the restraint energization method, and the other inverter.
  • the output voltage of 11b may be controlled so as to invert the polarity with respect to the output voltage of the inverter 11a. That is, in other words, the inverter control unit 12b may shift the voltage phase command ⁇ by 180 ° between the two inverters 11.
  • the inverter control unit 12b uses the inverters 11c and 11d to constrain and energize the compressor motor 22e.
  • the inverter control unit 12b selects so that one inverter 11 outputs the voltage of the voltage vector V0 and the other inverter 11 outputs the voltage of the voltage vector V7. Further, the inverter control unit 12b selects so that one inverter 11 outputs the voltage of the voltage vector V1 and the other inverter 11 outputs the voltage of the voltage vector V6. Further, the inverter control unit 12b selects so that one inverter 11 outputs the voltage of the voltage vector V2 and the other inverter 11 outputs the voltage of the voltage vector V5.
  • the inverter control unit 12b selects so that one inverter 11 outputs the voltage of the voltage vector V3 and the other inverter 11 outputs the voltage of the voltage vector V4. However, since the combined voltage of the two inverters 11 is twice the output voltage of one inverter 11, the inverter control unit 12b appropriately adjusts the voltage command V * so that the amount of heat generated is required for heating the refrigerant. To do.
  • the inverter control unit 12b averages the heating amount of each compressor 2, and the compressor motor 22d is similar to the first to third embodiments so that the refrigerant can be heated without variation for each compressor 2.
  • DC energization and high-frequency energization may be exchanged between the compressor motor 22e and the compressor motor 22e to perform restraint energization.
  • the inverter control unit 12b compresses the compressor motors 22d and 22e to prevent the refrigerant from staying even if the compressor motors 22d and 22e are independent winding type motors.
  • a plurality of compressors 2 are heated to vaporize the refrigerant while the machine 2 is on standby for operation, it is decided to heat the plurality of compressors 2 at the same time by different restraint energization methods.
  • the compressor drive device 1b is connected to a plurality of compressors 2, it suppresses an increase in noise due to high-frequency energization due to an increase in the number of compressors 2, and the own device or another device caused by noise. It is possible to prevent malfunctions and suppress an increase in standby power due to direct current energization.
  • the configuration shown in the above-described embodiment shows an example of the content of the present invention, can be combined with another known technique, and is one of the configurations without departing from the gist of the present invention. It is also possible to omit or change the part.
  • 1,1a, 1b Compressor drive 2a, 2b Compressor, 3 Power source, 4 Voltage detector, 5 Current detector, 11a, 11b, 11c, 11d Inverter, 12, 12a, 12b Inverter control unit, 21a, 21b compression mechanism, 22a, 22b, 22c, 22d, 22e compressor motor, 30 refrigeration cycle, 31 refrigerant circuit, 32 four-way valve, 33a, 33b heat exchanger, 34 expansion device, 100 air conditioner.

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  • Air Conditioning Control Device (AREA)
  • Control Of Ac Motors In General (AREA)
PCT/JP2019/035357 2019-09-09 2019-09-09 圧縮機駆動装置および空気調和装置 Ceased WO2021048895A1 (ja)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114608159A (zh) * 2022-02-18 2022-06-10 青岛海尔空调器有限总公司 用于控制直流空调器的方法及装置、空调器

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02264171A (ja) * 1990-03-08 1990-10-26 Matsushita Electric Ind Co Ltd 空気調和機の運転制御装置
JPH06147659A (ja) * 1992-10-30 1994-05-27 Hitachi Ltd 圧縮機保温装置
WO2013088541A1 (ja) * 2011-12-14 2013-06-20 三菱電機株式会社 ヒートポンプ装置ならびに、それを備えた空気調和機、ヒートポンプ給湯機、冷蔵庫、および冷凍機

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02264171A (ja) * 1990-03-08 1990-10-26 Matsushita Electric Ind Co Ltd 空気調和機の運転制御装置
JPH06147659A (ja) * 1992-10-30 1994-05-27 Hitachi Ltd 圧縮機保温装置
WO2013088541A1 (ja) * 2011-12-14 2013-06-20 三菱電機株式会社 ヒートポンプ装置ならびに、それを備えた空気調和機、ヒートポンプ給湯機、冷蔵庫、および冷凍機

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114608159A (zh) * 2022-02-18 2022-06-10 青岛海尔空调器有限总公司 用于控制直流空调器的方法及装置、空调器
CN114608159B (zh) * 2022-02-18 2024-02-20 青岛海尔空调器有限总公司 用于控制直流空调器的方法及装置、空调器

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