WO2013132620A1 - 空気調和機 - Google Patents
空気調和機 Download PDFInfo
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- WO2013132620A1 WO2013132620A1 PCT/JP2012/055851 JP2012055851W WO2013132620A1 WO 2013132620 A1 WO2013132620 A1 WO 2013132620A1 JP 2012055851 W JP2012055851 W JP 2012055851W WO 2013132620 A1 WO2013132620 A1 WO 2013132620A1
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- WIPO (PCT)
- Prior art keywords
- braking
- inverter
- air conditioner
- outdoor fan
- sequence
- Prior art date
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- 230000001360 synchronised effect Effects 0.000 claims abstract description 65
- 239000004065 semiconductor Substances 0.000 claims description 16
- 238000001514 detection method Methods 0.000 claims description 12
- 230000007423 decrease Effects 0.000 claims description 7
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 claims description 2
- 229910003460 diamond Inorganic materials 0.000 claims description 2
- 239000010432 diamond Substances 0.000 claims description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical group [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 2
- 229910002601 GaN Inorganic materials 0.000 claims 1
- 229910010271 silicon carbide Inorganic materials 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 17
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- 230000006866 deterioration Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
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- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
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Images
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/24—Arrangements for stopping
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/38—Fan details of outdoor units, e.g. bell-mouth shaped inlets or fan mountings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/20—Arrangements for starting
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/02—Details of starting control
- H02P1/029—Restarting, e.g. after power failure
-
- 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 an air conditioner.
- the upper transistor of the power transistor that drives the motor is fired at the same time or the lower transistor is fired at the preset ratio, and the motor is stopped.
- maintain for example, refer patent document 1).
- Patent Document 1 obtains a braking force by short-circuiting the motor wires by simultaneously firing the upper transistor or the lower transistor of the power transistor, but the rotational speed is extremely high or the rotational speed When the motor becomes extremely low, the braking force is reduced. For example, in the case of a motor that is rotated by being given a constant torque by an external force, it cannot be completely stopped.
- the ignition is performed at a predetermined ratio, the DC voltage of the inverter may be boosted by repeating ignition and extinction, which may result in circuit destruction.
- the ignition ratio is set to 100%, a transient current is generated due to ignition, and when a permanent magnet synchronous motor is used, there is a possibility that the efficiency of the motor is reduced due to the occurrence of irreversible demagnetization.
- Patent Document 2 repeats opening and shorting by turning the lower arm of the inverter ON and OFF, and gradually shortening the short-circuiting ratio to short-circuit the lines of the permanent magnet synchronous motor. Protect from regenerative voltage. However, if the upper arm of the inverter is short-circuited and the short-circuit ratio is small, the protection circuit may not react even if the ON time of the lower arm is short and a short-circuit current flows, and the inverter may be destroyed. In the technique shown in Patent Document 2, the permanent magnet synchronous motor wires are short-circuited for the purpose of protection from the regenerative voltage.
- the present invention has been made in view of the above, and when an outdoor fan of an air conditioner is rotated by an external force, the permanent magnet synchronous motor can be braked safely and reliably, and can be shifted to power running drive with certainty.
- the purpose is to obtain an air conditioner.
- the present invention is an air conditioner in which an indoor unit and an outdoor unit are separated, and includes an outdoor fan provided in the outdoor unit and a permanent magnet that drives the outdoor fan.
- a synchronous motor ; an inverter for applying a voltage to the permanent magnet synchronous motor using a DC power supply as a power supply; inverter control means for controlling a voltage output from the inverter; and a current connected between the DC power supply and the inverter Detecting means, and the inverter control means operates the inverter by a braking sequence for braking the rotation of the outdoor fan when the outdoor fan is rotated by an external force while the inverter is stopped. Thereafter, the inverter is operated by a driving sequence for driving the outdoor fan in a powering manner.
- the rotation is reduced by the braking operation and then the operation is shifted to the power running drive. There is an effect that can be.
- FIG. 1 is a diagram illustrating an air conditioner according to an embodiment.
- FIG. 2 is a diagram showing the configuration of the inverter control means.
- FIG. 3 shows the operation of the position / velocity detecting means.
- FIG. 4 is a diagram showing the configuration of the PWM output means.
- FIG. 5 is a diagram showing the operation of the PWM output means.
- FIG. 6 is a diagram showing the rotational speed characteristics of torque and current when the permanent magnet synchronous motor is short-circuited between lines.
- FIG. 7 is a diagram showing current characteristics when the permanent magnet synchronous motor is short-circuited between lines.
- FIG. 8 is a diagram illustrating dq-axis current characteristics when a permanent magnet synchronous motor is short-circuited between lines.
- FIG. 1 is a diagram illustrating an air conditioner according to an embodiment.
- FIG. 2 is a diagram showing the configuration of the inverter control means.
- FIG. 3 shows the operation of the position / velocity detecting means.
- FIG. 4
- FIG. 9 is a diagram illustrating an operation for suppressing a transient current when the permanent magnet synchronous motor is short-circuited between lines.
- FIG. 10 is a diagram showing another operation for suppressing the transient current when the permanent magnet synchronous motor is short-circuited between lines.
- FIG. 11 is a diagram showing current characteristics when a transient current at the time of a short circuit between lines of the permanent magnet synchronous motor is suppressed.
- FIG. 12 is a diagram showing dq-axis current characteristics when a transient current during a line short-circuit of the permanent magnet synchronous motor is suppressed.
- FIG. 13 is a flowchart in the braking sequence.
- FIG. 13 is a flowchart in the braking sequence.
- FIG. 14 is a diagram illustrating the relationship between the electrical angular frequency ⁇ and the optimum advance angle ⁇ f when there is no load.
- FIG. 15 is a diagram illustrating the relationship between the electrical angular frequency ⁇ and the optimum advance angle ⁇ f during strong winds.
- FIG. 1 is a diagram illustrating a configuration of an air conditioner 1 according to an embodiment of the present invention.
- an indoor unit 2 and an outdoor unit 3 are connected via a refrigerant pipe 4, and the outdoor unit 3 receives a DC voltage Vdc from a DC power source 5.
- Vdc DC voltage
- the drive circuit 6 By applying a voltage to the stator 8 of the permanent magnet synchronous motor 7 by the drive circuit 6 as a power source, a rotating magnetic field is generated and the rotor 9 is rotated to drive the outdoor fan 10 connected to the rotor 9. It is configured to generate air by rotating it and send it to a heat exchanger (not shown) of the refrigeration cycle 11 to perform heat exchange and perform cooling and heating operations.
- the drive circuit 6 includes an inverter 14 composed of switching elements 12a to 12f and freewheeling diodes 13a to 13f, a shunt resistor 15 installed between the DC power source 5 and the inverter 14, and a magnetic pole position of the rotor 9 of the permanent magnet synchronous motor 7.
- Magnetic pole position detecting means 16 for detecting the voltage
- DC voltage detecting means 17 for detecting the voltage of the DC power supply 5
- a protection circuit 18 for detecting and protecting the current flowing through the inverter 14 from the voltage of the shunt resistor 15, and based on each detected value
- inverter control means 19 for controlling the voltage applied to the permanent magnet synchronous motor 7 by outputting PWM for driving the switching elements 12a to 12f of the inverter 14.
- the inverter control means 19 includes a position / speed detection means 20, a PWM output means 21, a braking sequence 22, and a drive sequence 23, as shown in FIG.
- the position / velocity detecting means 20 outputs the magnetic pole position ⁇ and the electrical angular frequency ⁇ based on the magnetic pole position signals Hu, Hv, Hw, and the braking sequence 22 detects the line between the permanent magnet synchronous motor 7 based on the electrical angular frequency ⁇ .
- a PWM mode that opens or shorts is output, and a time ratio (DUTY) that repeats opening and shorting is output.
- the drive sequence 23 outputs an electrical angular frequency command ⁇ *, an advance angle ⁇ f, and a PWM mode for driving the motor based on the electrical angular frequency ⁇ .
- the PWM output means 21 generates a PWM signal (UP, VP, WP, WP, WP, WP, WP, WPTY, DUTY based on the protection signal, DC voltage Vdc, magnetic pole position ⁇ , electrical angular frequency ⁇ , electrical angular frequency command ⁇ *, advance angle ⁇ f, PWM mode, DUTY. (UN, VN, WN).
- the period from the rising edge to the rising edge of the U phase is one electrical cycle, and is counted every control cycle Ts, which is a discrete time of the microcomputer or the like.
- the electrical frequency can be obtained, and by multiplying by 2 ⁇ , the permanent magnet synchronous motor 7
- the electrical angular frequency ⁇ can be obtained.
- the mechanical angular frequency can be obtained by dividing the electrical angular frequency ⁇ by the number of pole pairs of the permanent magnet synchronous motor 7.
- FIG. 4 is a diagram showing the configuration of the PWM output means 21, which includes an adder / subtractor 24, a voltage control means 25, an adder / subtractor 26, a three-phase voltage command generating means 27, a triangular wave generating means 28, a comparator 29, an inverter 30, and PWM output permission means 31 is provided.
- the adder / subtractor 24 obtains the difference between the electrical angular frequency command ⁇ * and the electrical angular frequency ⁇ , and the voltage control means 25 obtains the voltage command V * by a control method represented by, for example, proportional integral control. Further, the adder / subtracter 26 adds the advance angle ⁇ f to the magnetic pole position ⁇ to obtain the voltage phase ⁇ v that is the energization phase for the inverter 14.
- the three-phase voltage command generating means 27 obtains three-phase voltage commands Vu *, Vv *, Vw * by the following equations (1) to (3) based on the voltage command V *, the DC voltage Vdc, and the voltage phase ⁇ v. .
- the PWM output means 21 outputs the three-phase voltage command values Vu *, Vv *, Vw * obtained by the equations (1) to (3) and the triangular wave generation means 28. Based on the magnitude relationship with the triangular wave carrier, the comparator 29 outputs “High” and “Low” signals, and one of the two branches is inverted by the inverter 30 to allow a total of six signals to be PWM output enabled. Send to means 31.
- the PWM output permission means 31 selects a PWM output to be output based on the PWM mode sent from the braking sequence 22 and the drive sequence 23, and outputs it as a PWM signal (UP, VP, WP, UN, VN, WN). . Switching control of the switching elements 12a to 12f of the inverter 14 is performed by this PWM signal, and a voltage based on the voltage command value can be applied to the permanent magnet synchronous motor 7.
- the PWM output permission means 31 of the PWM output means 21 restricts the output of the PWM signal so that the inverter 14 does not output a voltage. By this control, the inverter 14 can be protected.
- the PWM mode is for the drive sequence. In the brake sequence, UN, VN, WN are output, and for UP, VP, WP, output is stopped or vice versa. By performing the above operation, the permanent magnet synchronous motor 7 is operated so as to be short-circuited or opened.
- the braking sequence 22 will be described.
- the outdoor unit 3 of the air conditioner 1 is exposed to the outdoors, when a strong wind such as a typhoon blows into the outdoor fan 10, the outdoor fan 10 rotates. Therefore, before shifting to the drive sequence 23, the brake sequence 22 performs control to reduce the rotational speed of the outdoor fan 10. By reducing the number of rotations of the outdoor fan 10, the outdoor fan 10 has a shape close to a stopped state, and the outdoor fan 10 can be reliably driven.
- V d is d-axis voltage
- V q is q-axis voltage
- I d is d-axis current
- I q is q-axis current
- ⁇ is electrical angular frequency
- R is winding resistance
- L d is The d-axis inductance
- L q is the q-axis inductance
- ⁇ f is the induced voltage constant.
- P m in the equation (7) is the number of pole pairs of the permanent magnet synchronous motor 7.
- the motor constants (R, L d , L q , ⁇ f ) are generally fixed values. For this reason, it can be seen that the torque ⁇ m shown in the equation (7) is obtained by the flow of I d and I q corresponding to ⁇ shown in the equations (5) and (6). Further, the peak current Ip flowing at the time of short circuit is expressed by the following equation (8).
- FIG. 6 is a diagram showing the rotational speed characteristics of torque and current during a short circuit in a general permanent magnet synchronous motor 7 based on the above equations (7) and (8).
- the torque at this time acts in the negative direction so as to inhibit the rotation as the rotational speed increases, reaches a peak at a certain rotational speed, and then decreases.
- the current increases as the rotational speed increases and saturates at a predetermined current value. That is, although a current flows by short-circuiting the wires, a negative torque that inhibits the rotational speed is generated, so that the permanent magnet synchronous motor 7 can be braked.
- the torque reaches a peak at a predetermined number of revolutions.
- the design has a peak at 1000 rpm or less. Further, in normal times, the average wind speed of the air blown into the outdoor fan 10 is almost 10 m / s or less. In this case, the rotational speed of the outdoor fan 10 is 1000 rpm or less, and there is no problem with braking.
- FIG. 8 shows a diagram in which the current of FIG. 7 is separated into a d-axis current I d that is an excitation current and a q-axis current I q that is a torque current.
- DUTY_START (at the start of braking) is used as a voltage command (Vu *, Vv *, Vw *) for comparing the duty ratio representing the energization ratio when the permanent magnet synchronous motor 7 is short-circuited with the triangular wave.
- PWM_TIME time from “DUTY_START” to “DUTY_END” from DUTY_END (also referred to as “energization ratio at the end of braking, also referred to as“ energization ratio at the end ”) to DUTY_END It is gradually increased over time (also referred to as “braking control time”).
- the PWM mode is set so that UP, VP, and WP do not operate, and the PWM signal is sent to the PWM output permission means 31.
- the torque for braking shown in FIG. 6 is obtained by setting the short-circuit ratio to be 100% (always short-circuit).
- braking is applied due to a short circuit when DUTY exceeds approximately 50%. Therefore, as shown in FIG. 10, DUTY is greatly increased at the initial stage of braking, and the amount of change in DUTY at the end of braking is increased. It is possible to reduce PWM_TIME by reducing. Further, by such control, not only a sufficient transient current suppression effect can be obtained even in a state where PWM_TIME is decreased, but it is also possible to suppress the boosting of the DC voltage.
- the outdoor fan 10 can be braked while preventing not only the permanent magnet synchronous motor 7 but also the inverter 14 from generating heat.
- the braking control may be performed based on the electrical angular frequency ⁇ output from the position / velocity detection means 20. Specifically, when the number of rotations is high, it is determined that the heat exchange is sufficiently performed even if the refrigeration cycle 11 does not rotate the outdoor fan 10, and braking by short circuit operation is not performed, and the wind weakens and heat exchange occurs. The operation is performed when the amount decreases to a braking speed that is insufficient.
- the protection circuit 18 may not be able to detect the current. For this reason, when the current detection speed is low (in the case of the configuration of the present embodiment, the capability of the protection circuit 18 is low), it is desirable to set the start energization ratio so that the short-circuiting time becomes long. . For this reason, it is preferable that the starting energization ratio is set according to the capability of the protection circuit 18, and more specifically, the lower the capability of the protection circuit 18, the longer the starting energization ratio.
- the switching elements 12a to 12f constituting the inverter 14 are configured by normally-off switching elements and the switching elements 12d to 12f are configured by normally-on switching elements.
- the permanent magnet synchronous motor 7 is always short-circuited between the lines of the permanent magnet synchronous motor 7, that is, the rotation of the outdoor fan 10 is continuously braked without outputting a PWM signal.
- the motor current gradually increases as the electrical angular frequency ⁇ increases as shown in FIG. This eliminates the occurrence of transient currents and eliminates the need for complicated control such as braking while changing the DUTY, reducing the cost of the microcomputer that performs the control and reducing the number of components. Is possible.
- switching elements 12a to 12f constituting inverter 14 and freewheeling diodes 13a to 13f connected in parallel therewith it is generally the mainstream to use a semiconductor made of silicon (Si) as a material.
- a semiconductor made of silicon (Si) instead of this, a wide gap semiconductor made of silicon carbide (SiC), gallium nitride (GaN), or diamond may be used.
- the switching element and the diode element formed by such a wide band gap semiconductor have high voltage resistance and high allowable current density. Therefore, the switching element and the diode element can be reduced in size, and by using these reduced switching element and diode element, the semiconductor module incorporating these elements can be reduced in size.
- switching elements and diode elements formed of such wide band gap semiconductors have high heat resistance.
- the heat sink fins of the heat sink can be miniaturized and the water cooling part can be air cooled, so that the semiconductor module can be further miniaturized.
- switching elements and diode elements formed of such wide band gap semiconductors have low power loss. For this reason, it is possible to increase the efficiency of the switching element and the diode element, and to increase the efficiency of the semiconductor module.
- the line between the permanent magnet synchronous motors 7 is short-circuited, and the short-circuit current becomes a switching element. Even if it continues to flow, the loss can be reduced. Further, since the loss can be reduced, the amount of heat generation is reduced and the resistance to high temperature is excellent, so that the requirement for the amount of heat generation and the operating temperature of the switching element that is always short-circuited is eased.
- the rotational speed can be reduced to a substantially stopped state, and it is possible to approach a stopped state without wind. .
- the drive control from the conventional stop state can be used as it is by moving to the drive sequence 23, and a complicated drive control is constructed. Is no longer necessary. This makes it possible to use an inexpensive control microcomputer or the like.
- FIG. 13 is an example of a flowchart showing the operation of the braking sequence in the first embodiment described so far, and can be specifically realized by the processing of steps S1 to S5 shown below.
- the position / velocity detecting means 20 measures the magnetic pole position ⁇ and the electrical angular frequency ⁇ of the rotor 9 of the permanent magnet synchronous motor 7 based on the outputs Hu, Hv, Hw of the magnetic pole position detecting means 16.
- step S2 Upper limit rotational speed judgment step
- step S2 On the basis of the electrical angular frequency ⁇ measured in step S1, if the upper limit rotational speed as a drive permission rotational speed set in advance is exceeded (step S2, No), it is determined that braking is impossible, and the step Return to S1.
- step S2 On the other hand, if it is less than the upper limit rotational speed (step S2, Yes), it is determined that braking is possible and the process proceeds to step S3.
- step S4 Braking step
- step S5 Start rotation speed judgment step
- the electrical angular frequency ⁇ decreases.
- step S5 the measured value of the measured electrical angular frequency ⁇ is compared with a predetermined starting rotational speed. If the measured value of the electrical angular frequency ⁇ is not less than or equal to the starting rotational speed (step S5, No), the process returns to step S1. In other words, when the electrical angular frequency ⁇ is not braked to the start rotational speed or less, the braking operation is stopped, and the braking operation is restarted again after a predetermined time has elapsed.
- step S5 when the measured value of the electrical angular frequency ⁇ is equal to or lower than the starting rotational speed (step S5, Yes), when the electrical angular frequency ⁇ is braked to the rotational speed equal to or lower than the starting rotational speed, the process proceeds to the drive sequence.
- shifting to the driving sequence a signal for shifting to the driving sequence is issued, and the driving operation of the permanent magnet synchronous motor 7 is started.
- the permanent magnet synchronous motor 7 can be activated under conditions close to the stop state, and the permanent magnet synchronous motor 7 can be driven in a powering manner reliably and quickly.
- the drive sequence 23 the drive operation is started by a transition signal (see FIG. 2) issued from the brake sequence 22.
- the drive sequence 23 receives the electrical angular frequency ⁇ and outputs the electrical angular frequency command ⁇ *, the advance angle ⁇ f, and the PWM mode to the PWM output means, and PWM (UP, VP, WP, UN, VN, WN) as described above. Is output to drive the permanent magnet synchronous motor 7.
- the electrical angular frequency command ⁇ * is changed each time depending on the operation state of the refrigeration cycle 11, and the voltage command V * is generated so as to follow the electrical angular frequency command ⁇ *.
- the advance angle ⁇ f for driving at the maximum efficiency point has a characteristic as shown in FIG. That is, it is necessary to increase the advance angle ⁇ f for driving at the maximum efficiency point as shown in FIG. 14 with respect to the electrical angular frequency ⁇ . For this reason, in the drive sequence, if information on the advance angle ⁇ f with respect to the electrical angular frequency ⁇ is stored in advance as table data or a mathematical expression, optimum drive can be performed.
- the advance angle ⁇ f for optimum driving changes to the characteristics shown in FIG. 15, for example, and if the advance angle ⁇ f shown in FIG. There is a risk that the rotational speed will decrease due to an increase in current or an output torque shortage of the permanent magnet synchronous motor 7. For this reason, the fluctuation characteristics of the advance angle ⁇ f when the load increases are known, or some candidates of the advance angle ⁇ f when the load increases so that there is no problem even when the load increases. It is preferable to select a value in advance.
- the output voltage is set low immediately after the transition to the drive sequence 23, there is a concern about a start failure due to insufficient output voltage or an increase in start time when the load due to wind is increased. Therefore, in the braking sequence 22, it is possible to measure the rotational speed of the outdoor fan 10 in a state where the inverter 14 is not operated, so it is estimated how much wind is generated from the measured rotational speed. Then, it is preferable to select some candidate values in advance according to the load related to the voltage command V * and the advance angle ⁇ f at the time of shifting to the drive sequence 23.
- the start-up is surely performed by using an appropriate voltage command V * and the advance angle ⁇ f, and the advance angle ⁇ f after the start-up is gradually increased to the value indicated in the table data or the like.
- the air conditioner according to the present embodiment when the outdoor fan 10 is rotated by an external force while the inverter 14 is stopped, the braking sequence 22 that brakes the rotation of the outdoor fan 10. After the inverter 14 is operated, the inverter 14 is operated by the drive sequence 23 that drives the outdoor fan 10 to power. Therefore, braking is possible even when the outdoor fan 10 of the outdoor unit 3 is exposed to strong wind. In this case, the permanent magnet synchronous motor 7 can be reliably driven to blow air to the refrigeration cycle 11.
- the configuration shown in the above embodiment is an example of the configuration of the present invention, and can be combined with another known technique, and a part thereof is omitted without departing from the gist of the present invention. Needless to say, it is possible to change the configuration.
- the description of the invention has been made for an air conditioner having a refrigeration cycle, but the application field is not limited to this, and a heat pump water heater, a refrigeration apparatus, and a ventilation having a refrigeration cycle are not limited thereto. Needless to say, it can be applied to a blower.
- the present invention is useful as an air conditioner capable of safely and reliably braking a permanent magnet synchronous motor and reliably shifting to a power running drive.
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Abstract
Description
図1は、本発明の実施の形態における空気調和機1の構成を示す図である。本実施の形態における空気調和機1は、図1に示すように、室内機2と室外機3とが冷媒配管4を介して接続されており、室外機3は直流電源5による直流電圧Vdcを電源とした駆動回路6により、永久磁石同期モータ7の固定子8に電圧を印加することで回転磁界を発生させ回転子9を回転駆動させることで、回転子9に接続された室外ファン10を回転させて風を発生させ冷凍サイクル11の図示しない熱交換器に送ることで熱交換を行い冷房および暖房運転を行うよう構成されている。
位置速度検出手段20は、磁極位置検出手段16の出力Hu、Hv、Hwに基づいて永久磁石同期モータ7の回転子9の磁極位置θおよび電気角周波数ωを計測する。
ステップS1にて計測された電気角周波数ωに基づいて、あらかじめ設定された駆動許可回転数としての上限回転数を超過している場合には(ステップS2,No)、制動不可と判断してステップS1に戻る。一方、上限回転数未満の場合には(ステップS2,Yes)、制動可能と判断してステップS3へ移行する。
短絡による制動時には、インバータ14のスイッチング素子12a~12cまたは12d~12fを同時にON状態とすることにより行うため、どちらか一方のスイッチング素子は常時OFF状態に設定する。なお、図13においては、UP=VP=WP=OFF、UN=VN=WN=ONとしているが、逆の関係、すなわちUP=VP=WP=ON、UN=VN=WN=OFFとしてもよい。
ステップS4では、図9に示すように三角波と比較するDUTY(=Vu*=Vv*=Vw*)をDUTY_STARTからDUTY_ENDまでPWM_TIMEの時間をかけて徐々に増加させ、また、DUTY_ENDを短絡の比率が100%(常時短絡)になるよう設定し、過渡的な電流増加を抑制しつつ、永久磁石同期モータ7の回転数を減少させる制御を行う。
ステップS4による制動動作が実行される場合、電気角周波数ωが小さくなって行く。ステップS5では、計測された電気角周波数ωの計測値と所定の起動回転数とを比較する。電気角周波数ωの計測値が起動回転数以下とならない場合には(ステップS5,No)、ステップS1の処理に戻る。つまり、電気角周波数ωが起動回転数以下まで制動されない場合には、制動動作を停止させ、所定時間経過後に再度制動動作を再開させる。一方、電気角周波数ωの計測値が起動回転数以下となる場合、すなわち(ステップS5,Yes)、電気角周波数ωが起動回転数以下まで制動される場合には、駆動シーケンスに移行する。なお、駆動シーケンスに移行する場合、駆動シーケンスに移行する信号が発せられ、永久磁石同期モータ7の駆動動作が開始される。これにより、永久磁石同期モータ7が停止状態と近い条件にて起動を行うことが可能となり、永久磁石同期モータ7を確実かつ迅速に力行駆動することが可能となる。
2 室内機
3 室外機
4 冷媒配管
5 直流電源
6 駆動回路
7 永久磁石同期モータ
8 固定子
9 回転子
10 室外ファン
11 冷凍サイクル
12a~12f スイッチング素子
13a~13f 環流ダイオード
14 インバータ
15 シャント抵抗
16 磁極位置検出手段
17 直流電圧検出手段
18 保護回路
19 インバータ制御手段
20 位置速度検出手段
21 PWM出力手段
22 制動シーケンス
23 駆動シーケンス
24,26 加減算器
25 電圧制御手段
27 三相電圧指令生成手段
28 三角波生成手段
29 比較器
30 反転器
31 PWM出力許可手段
Claims (15)
- 室内機と室外機が分離した空気調和機であって、
室外機に設けられる室外ファンと、
前記室外ファンを駆動する永久磁石同期モータと、
直流電源を電源として前記永久磁石同期モータに電圧を印加するインバータと、
前記インバータの出力する電圧を制御するインバータ制御手段と、
前記直流電源と前記インバータとの間に接続された電流検出手段と、を備え、
前記インバータ制御手段は、前記インバータの停止中に前記室外ファンが外力により回転している場合には、前記室外ファンの回転を制動する制動シーケンスにより前記インバータを動作させた後、前記室外ファンを力行駆動する駆動シーケンスにより前記インバータを動作させることを特徴とする空気調和機。 - 前記駆動シーケンスは、前記制動シーケンス動作中の前記室外ファンの回転数情報に基づいて、前記インバータの出力電圧および通電位相を変化させることを特徴とする請求項1に記載の空気調和機。
- 前記駆動シーケンスは、前記制動シーケンス動作中の前記室外ファンの回転数が高い場合には、起動時の印加電圧および通電位相を増加させることを特徴とする請求項2に記載の空気調和機。
- 前記制動シーケンスは、制動開始時の通電比率である開始時通電比率と、制動終了時の通電比率である終了時通電比率とが設定され、前記開始時通電比率から前記終了時通電比率までの間で制動制御の経過と共に短絡時間が長くなるように設定された通電比率の情報に基づいて、前記永久磁石同期モータの線間を開放および短絡する制御を行うことを特徴とする請求項1に記載の空気調和機。
- 前記開始時通電比率から前記終了時通電比率までの増分は、前記開始時通電比率の出力時には大きく、前記終了時通電比率の出力時に近づくほど小さくなることを特徴とする請求項4に記載の空気調和機。
- 前記制動シーケンスは、電流検出手段の電流検出速度に応じて前記開始時通電比率が設定されることを特徴とする請求項4に記載の空気調和機。
- 前記電流検出速度が遅い場合には、短絡の時間が長くなるように前記開始時通電比率が設定されることを特徴とする請求項6に記載の空気調和機。
- 前記制動シーケンスの終了時には、常時短絡動作となるように前記終了時通電比率が設定されることを特徴とする請求項4に記載の空気調和機。
- 前記制動シーケンスは、前記室外ファンの回転数が駆動許可回転数以下まで制動されない場合には制動を休止し、所定時間経過後に再度制動を行うことを特徴とする請求項1に記載の空気調和機。
- 前記制動シーケンスは、前記室外ファンの回転数が制動許可回転数以上の場合には、前記室外機が十分に熱交換可能と判断して待機動作に移行し、前記制動許可回転数以下となった場合には制動動作を行うことを特徴とする請求項1に記載の空気調和機。
- 前記インバータを構成する半導体スイッチング素子のうち、前記直流電源の正側もしくは負側に接続される一方をノーマリオン型で構成し、前記制動シーケンスは前記インバータを停止状態に維持することを特徴とする請求項1に記載の空気調和機。
- 前記制動シーケンスは、前記室外ファンの回転数が駆動許可回転数以下まで制動が完了した場合に、前記制動シーケンスを終了し、前記駆動シーケンスに移行することを特徴とする請求項1に記載の空気調和機。
- 前記インバータを構成する半導体スイッチング素子は、ワイドバンドギャップ半導体にて形成されることを特徴とする請求項1に記載の空気調和機。
- 前記インバータにおいて、前記短絡動作時に電流が流れる経路にのみ、ワイドバンドギャップ半導体を用いることを特徴とする請求項1に記載の空気調和機。
- 前記ワイドバンドギャップ半導体は、炭化珪素、窒化ガリウムまたはダイヤモンドであることを特徴とする請求項13または14に記載の空気調和機。
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CN112154294A (zh) * | 2018-05-31 | 2020-12-29 | 三菱电机株式会社 | 室外机以及制冷循环装置 |
US11473789B2 (en) | 2018-05-31 | 2022-10-18 | Mitsubishi Electric Corporation | Outdoor unit for a refrigeration cycle apparatus and refrigerating cycle device |
CN112303707A (zh) * | 2020-10-15 | 2021-02-02 | 青岛海信日立空调系统有限公司 | 一种空调器和电压控制方法 |
CN112303707B (zh) * | 2020-10-15 | 2023-12-12 | 青岛海信日立空调系统有限公司 | 一种空调器和电压控制方法 |
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CN104145418B (zh) | 2017-07-21 |
EP2824828B1 (en) | 2023-05-03 |
JPWO2013132620A1 (ja) | 2015-07-30 |
JP5893127B2 (ja) | 2016-03-23 |
EP2824828A1 (en) | 2015-01-14 |
US20150028780A1 (en) | 2015-01-29 |
EP2824828A4 (en) | 2016-08-10 |
US9385642B2 (en) | 2016-07-05 |
CN104145418A (zh) | 2014-11-12 |
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