WO2020188764A1 - Motor drive control device and outdoor unit of air conditioner - Google Patents
Motor drive control device and outdoor unit of air conditioner Download PDFInfo
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- WO2020188764A1 WO2020188764A1 PCT/JP2019/011535 JP2019011535W WO2020188764A1 WO 2020188764 A1 WO2020188764 A1 WO 2020188764A1 JP 2019011535 W JP2019011535 W JP 2019011535W WO 2020188764 A1 WO2020188764 A1 WO 2020188764A1
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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
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/032—Preventing damage to the motor, e.g. setting individual current limits for different drive conditions
Definitions
- the present invention relates to a motor drive control device for driving a motor and an outdoor unit of an air conditioner.
- the outdoor unit of a conventional air conditioner is equipped with a compressor, fan, inverter, heat exchanger, etc., and heat exchange is performed by operating these.
- the compressor and fan are equipped with a motor, which is driven by the power supplied by the inverter circuit.
- relays are provided for each of the six signal lines of the inverter circuit, and when the pressure sensor detects an abnormal pressure of the compressor, the relays are opened to stop the drive of the inverter circuit and the compressor motor. Disclose a motor drive control device for stopping the engine.
- the motor drive control device described in Patent Document 1 is provided on six signal lines to the inverter circuit when the motor of the compressor fails and the pressure detected by the pressure sensor exceeds the threshold value. By opening the relay, the switching element is stopped and the power supply to the compressor is cut off.
- the motor drive control device described in Patent Document 1 since all the relays provided in the six signal lines are open, the electric charge does not escape, the diode of the switching element and the like are destroyed, and the inverter circuit fails. There was a problem that it became a factor.
- the present invention has been made in view of the above, and an object of the present invention is to obtain a motor drive control device capable of stopping the supply of electric power to a motor while suppressing a failure of an inverter circuit.
- the motor drive control device has a first switching element unit and a second switching element unit each including one or more switching elements.
- the control unit that controls the inverter circuit by outputting the drive signal to the inverter circuit, and the first switching element unit and the control unit. It is provided and closes when power is supplied, closes to connect the control unit and the first switching element unit, and opens when the power supply is cut off, and opens to connect the control unit and the first switching element unit.
- the motor drive control device has the effect of being able to stop the supply of electric power to the motor while suppressing the failure of the inverter circuit.
- FIG. 1 is a diagram showing a configuration example of an outdoor unit of an air conditioner according to an embodiment.
- the outdoor unit 1 includes a fan 2, a compressor 3, and a control board 4.
- the fan 2 includes a motor and circulates air by driving the motor.
- the compressor 3 includes a motor and drives the motor to compress the refrigerant.
- the control board 4 includes a motor drive control device 20.
- the motor drive control device 20 controls at least one of the motor used in the fan 2 and the motor used in the compressor 3.
- FIG. 2 is a diagram showing a configuration example of the motor drive control device 20 according to the embodiment.
- the motor drive control device 20 includes an inverter circuit 7, a control unit 9, a thermal relay 10, and a multi-contact relay 11.
- the inverter circuit 7 has a first switching element section and a second switching element section, each of which has one or more switching elements, and uses the power supplied from the power supply 8 to apply a direct current from the DC power supply 5.
- the voltage is converted into an AC voltage, and the AC voltage is applied to the motor 6.
- the first switching element unit is a switching element on the positive side.
- the second switching element unit is a switching element on the negative side.
- the first switching element unit may be the negative side switching element, and the second switching element unit may be the positive side switching element.
- the switching element on the positive side is a switching element connected to the positive electrode of the DC power supply 5.
- the switching element on the negative side is a switching element connected to the negative electrode of the DC power supply 5.
- the control unit 9 controls the inverter circuit 7 by outputting a drive signal to the inverter circuit 7, and controls the operation of the motor 6.
- the drive signal is a PWM signal for PWM (Pulse Width Modulation) control of the inverter circuit 7.
- the thermal relay 10 is between the multi-contact relay 11 and the power supply 12, and is attached to either the outer shell or the inner surface of the motor 6. When the thermal relay 10 is mounted inside the motor 6, the thermal relay 10 is mounted on a winding, a stator, or the like inside the motor 6.
- the thermal relay 10 detects the temperature of the motor 6 and opens and closes according to the temperature of the motor 6.
- the thermal relay 10 is opened by the control unit 9 when the temperature of the motor 6 reaches a predetermined temperature. Further, the thermal relay 10 supplies electric power to the multi-contact relay 11 by closing it, and cuts off the electric power supply of the multi-contact relay 11 by opening it.
- the motor 6 rotates to rotate the fan 2 and operate the compressor 3.
- the multi-contact relay 11 is provided between the control unit 9 and the first switching element unit. Further, the multi-contact relay 11 closes when the power is supplied from the power supply 12, and opens when the power from the power supply 12 is cut off. When the multi-contact relay 11 is closed, a drive signal is supplied from the control unit 9 to the first switching element unit. When the multi-contact relay 11 is opened, the connection between the control unit 9 and the first switching element unit is cut off, and the drive signal from the control unit 9 to the first switching element unit is cut off. In FIG. 2, the multi-contact relay 11 is arranged so as to disconnect the positive side of the plurality of switching elements. The multi-contact relay 11 is also simply called a relay.
- the inverter circuit 7 includes a P-side control circuit 13 that controls a switching element connected to the positive side of the DC power supply 5 in the inverter circuit 7, and a switching element connected to the negative side of the DC power supply 5 in the inverter circuit 7. It includes an N-side control circuit 14 for controlling.
- the P-side control circuit 13 controls the on / off of the three P-side switching elements of the inverter circuit 7 by using the drive signal output from the control unit 9, and adjusts the voltage applied to the motor 6.
- the N-side control circuit 14 controls the on / off of the three N-side switching elements of the inverter circuit 7 by using the drive signal output from the control unit 9, and adjusts the voltage applied to the motor 6.
- the control unit 9, the P-side control circuit 13, and the N-side control circuit 14 are realized by a processing circuit that is an electronic circuit that performs each processing.
- This processing circuit may be dedicated hardware or a control circuit including a memory and a CPU (Central Processing Unit, central processing unit) that executes a program stored in the memory.
- the memory corresponds to, for example, a non-volatile or volatile semiconductor memory such as a RAM (Random Access Memory), a ROM (Read Only Memory), or a flash memory, a magnetic disk, an optical disk, or the like.
- FIG. 3 is a diagram showing a control circuit according to the embodiment.
- the control circuit is, for example, the control circuit 100 having the configuration shown in FIG.
- the control circuit 100 includes a processor 100a, which is a CPU, and a memory 100b.
- a processor 100a which is a CPU
- a memory 100b When it is realized by the control circuit 100 shown in FIG. 3, it is realized by the processor 100a reading and executing the program corresponding to each process stored in the memory 100b.
- the memory 100b is also used as a temporary memory in each process performed by the processor 100a.
- the switching element included in the inverter circuit 7 is, for example, a semiconductor element such as a MOSFET (Metal Oxide Semiconductor Field Effect Transistor).
- MOSFET Metal Oxide Semiconductor Field Effect Transistor
- the motor drive control device 20 When the motor 6 fails and cannot rotate, the motor 6 cannot convert electric power into power, and generates more heat than when the motor 6 can convert electric power into power. Therefore, if the AC voltage is continuously applied to the motor 6, the temperature of the motor 6 rises, and the winding inside the motor 6 exceeds the temperature at which dielectric breakdown occurs, so that a ground fault occurs.
- the thermal relay 10 when the temperature of the outer shell and the inside of the motor 6 exceeds a predetermined value, the thermal relay 10 is opened. For example, when the temperature of the outer shell and the inside of the motor 6 reaches 150 ° C., or when the temperature does not exceed 150 ° C., the thermal relay 10 is opened.
- the thermal relay 10 When the thermal relay 10 is opened, the power supply of the power supply 12 to the multi-contact relay 11 is cut off, so that the multi-contact relay 11 is opened. Since the multi-contact relay 11 is opened, the drive signal from the control unit 9 to the P side control circuit 13, that is, the positive side of the inverter circuit 7 is cut off, so that no voltage is applied to the motor 6. By not applying the voltage to the motor 6, the winding of the motor 6 can be stopped without rising to the temperature at which dielectric breakdown occurs, and the occurrence of a ground fault can be suppressed.
- the multi-contact relay 11 is provided between the P-side control circuit 13 and the control unit 9, the drive signal of only the P-side control circuit 13 is cut off. Therefore, since the connection between the N-side control circuit 14 and the control unit 9 is not cut off, the inverter circuit 7 can suppress the failure of the inverter circuit 7 without leaving residual charges.
- the multi-contact relay 11 is provided between the P-side control circuit 13 and the control unit 9, and the drive signal of only the P-side control circuit 13 is cut off.
- the multi-contact relay 11 May be provided between the N-side control circuit 14 and the control unit 9 to cut off the drive signal of only the N-side control circuit 14.
- the multi-contact relay 11 is provided between the P-side control circuit 13 and the control unit 9 and between the N-side control circuit 14 and the control unit 9, and the P-side control circuit 13 and the N-side control circuit 14 are provided.
- the drive signal may be cut off.
- 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.
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Abstract
This motor drive control device (20) comprises: an inverter circuit (7) that has a first switching element unit and a second switching element unit each comprising one or more switching element, and that converts DC voltage to AC voltage and applies the converted voltage to a motor (6); a control unit (9) that controls the inverter circuit (7) by outputting a drive signal to the inverter circuit (7); a relay (11) that is provided between the first switching element unit and the control unit (9), that closes when power is supplied, that connects the control unit (9) and the first switching element unit by closing, that opens when the supply of power is cut, that cuts the connection between the control unit and the first switching unit by opening, and that cuts the drive signal by cutting the connection; and a thermal relay (10) that opens and closes according to the temperature of the motor, that supplies power to the relay (11) by closing, and that cuts the supply of power of the relay (11) by opening when the temperature of the motor exceeds a predetermined value.
Description
本発明は、モータを駆動するモータ駆動制御装置および空気調和機の室外機に関する。
The present invention relates to a motor drive control device for driving a motor and an outdoor unit of an air conditioner.
従来の空気調和機の室外機は、圧縮機、ファン、インバータ、熱交換器などを備え、これらを動作させることで熱交換を行う。圧縮機およびファンはモータを備え、モータはインバータ回路から供給される電力によって駆動される。特許文献１は、インバータ回路の６本の信号線にそれぞれリレーを設け、圧力センサが圧縮機の異常圧力を検知したときリレーを開放することで、インバータ回路の駆動を停止させて圧縮機のモータを停止させるモータ駆動制御装置を開示する。
The outdoor unit of a conventional air conditioner is equipped with a compressor, fan, inverter, heat exchanger, etc., and heat exchange is performed by operating these. The compressor and fan are equipped with a motor, which is driven by the power supplied by the inverter circuit. In Patent Document 1, relays are provided for each of the six signal lines of the inverter circuit, and when the pressure sensor detects an abnormal pressure of the compressor, the relays are opened to stop the drive of the inverter circuit and the compressor motor. Disclose a motor drive control device for stopping the engine.
上記特許文献１に記載のモータ駆動制御装置は、圧縮機のモータが故障し、圧力センサにより検出された圧力がしきい値を超えた時に、インバータ回路への６本の信号線に設けられたリレーを開放することでスイッチング素子を停止させ、圧縮機への電力供給を断つようにしている。しかしながら、特許文献１に記載のモータ駆動制御装置は、６本の信号線に設けられるリレーを全て開放しているため、電荷が抜けず、スイッチング素子のダイオードなどが破壊され、インバータ回路の故障の要因となるという問題があった。
The motor drive control device described in Patent Document 1 is provided on six signal lines to the inverter circuit when the motor of the compressor fails and the pressure detected by the pressure sensor exceeds the threshold value. By opening the relay, the switching element is stopped and the power supply to the compressor is cut off. However, in the motor drive control device described in Patent Document 1, since all the relays provided in the six signal lines are open, the electric charge does not escape, the diode of the switching element and the like are destroyed, and the inverter circuit fails. There was a problem that it became a factor.
本発明は、上記に鑑みてなされたものであって、インバータ回路の故障を抑制しつつモータへの電力の供給を停止することができるモータ駆動制御装置を得ることを目的とする。
The present invention has been made in view of the above, and an object of the present invention is to obtain a motor drive control device capable of stopping the supply of electric power to a motor while suppressing a failure of an inverter circuit.
上述した課題を解決し、目的を達成するために、本発明に係るモータ駆動制御装置は、それぞれが１つ以上のスイッチング素子を備える第１のスイッチング素子部および第２のスイッチング素子部を有し、直流電圧を交流電圧に変換してモータに印加するインバータ回路と、インバータ回路に駆動信号を出力することでインバータ回路を制御する制御部と、第１のスイッチング素子部と制御部との間に設けられ、電力の供給がされると閉じ、閉じることで制御部と第１のスイッチング素子部とを接続し、電力の供給が断たれると開放し、開放することで制御部と第１のスイッチング素子部との接続を断ち、接続を断つことで駆動信号を断つリレーと、モータの温度に応じて開閉し、閉じることでリレーに電力を供給し、モータの温度があらかじめ定められた値を超えたとき開放することでリレーの電力の供給を断つサーマルリレーと、を備える。
In order to solve the above-mentioned problems and achieve the object, the motor drive control device according to the present invention has a first switching element unit and a second switching element unit each including one or more switching elements. Between the inverter circuit that converts DC voltage to AC voltage and applies it to the motor, the control unit that controls the inverter circuit by outputting the drive signal to the inverter circuit, and the first switching element unit and the control unit. It is provided and closes when power is supplied, closes to connect the control unit and the first switching element unit, and opens when the power supply is cut off, and opens to connect the control unit and the first switching element unit. A relay that disconnects the connection with the switching element and disconnects the drive signal by disconnecting, and a relay that opens and closes according to the temperature of the motor and closes to supply power to the relay, and the temperature of the motor is set to a predetermined value. It is equipped with a thermal relay that cuts off the power supply of the relay by opening it when it exceeds the limit.
本発明に係るモータ駆動制御装置は、インバータ回路の故障を抑制しつつモータへの電力の供給を停止することができるという効果を奏する。
The motor drive control device according to the present invention has the effect of being able to stop the supply of electric power to the motor while suppressing the failure of the inverter circuit.
以下に、本発明の実施の形態にかかるモータ駆動制御装置および空気調和機の室外機を図面に基づいて詳細に説明する。なお、この実施の形態によりこの発明が限定されるものではない。
The motor drive control device and the outdoor unit of the air conditioner according to the embodiment of the present invention will be described in detail below with reference to the drawings. The present invention is not limited to this embodiment.
実施の形態．
図１は、実施の形態にかかる空気調和機の室外機の構成例を示す図である。室外機１は、ファン２と、圧縮機３と、制御基板４とを備える。ファン２は、モータを備え、モータを駆動させることで空気を循環させる。圧縮機３は、モータを備え、モータを駆動させることで冷媒を圧縮させる。制御基板４は、モータ駆動制御装置２０を備える。モータ駆動制御装置２０は、ファン２で使用されるモータ、または圧縮機３で使用されるモータ、の少なくとも一方のモータについて制御を行う。 Embodiment.
FIG. 1 is a diagram showing a configuration example of an outdoor unit of an air conditioner according to an embodiment. Theoutdoor unit 1 includes a fan 2, a compressor 3, and a control board 4. The fan 2 includes a motor and circulates air by driving the motor. The compressor 3 includes a motor and drives the motor to compress the refrigerant. The control board 4 includes a motor drive control device 20. The motor drive control device 20 controls at least one of the motor used in the fan 2 and the motor used in the compressor 3.
図１は、実施の形態にかかる空気調和機の室外機の構成例を示す図である。室外機１は、ファン２と、圧縮機３と、制御基板４とを備える。ファン２は、モータを備え、モータを駆動させることで空気を循環させる。圧縮機３は、モータを備え、モータを駆動させることで冷媒を圧縮させる。制御基板４は、モータ駆動制御装置２０を備える。モータ駆動制御装置２０は、ファン２で使用されるモータ、または圧縮機３で使用されるモータ、の少なくとも一方のモータについて制御を行う。 Embodiment.
FIG. 1 is a diagram showing a configuration example of an outdoor unit of an air conditioner according to an embodiment. The
図２は、実施の形態にかかるモータ駆動制御装置２０の構成例を示す図である。モータ駆動制御装置２０は、インバータ回路７と、制御部９と、サーマルリレー１０と、多接点リレー１１とを備える。インバータ回路７は、それぞれが１つ以上のスイッチング素子を備える第１のスイッチング素子部および第２のスイッチング素子部を有し、電源８から供給される電力を用いて直流電源５から印加される直流電圧を交流電圧に変換して、交流電圧をモータ６に印加する。第１のスイッチング素子部は、正側のスイッチング素子である。第２のスイッチング素子部は、負側のスイッチング素子である。なお、第１のスイッチング素子部が、負側のスイッチング素子であって、第２のスイッチング素子部が、正側のスイッチング素子であってもよい。正側のスイッチング素子は、直流電源５の正の電極に接続されるスイッチング素子である。負側のスイッチング素子は、直流電源５の負の電極に接続されるスイッチング素子である。制御部９は、駆動信号をインバータ回路７に出力することでインバータ回路７を制御し、モータ６の運転を制御する。駆動信号は、具体的には、インバータ回路７をＰＷＭ（Pulse Width Modulation）制御するためのＰＷＭ信号である。サーマルリレー１０は、多接点リレー１１と電源１２との間であって、モータ６の外殻、内部のどちらかに取り付けられる。サーマルリレー１０をモータ６の内部に取り付ける場合、サーマルリレー１０は、モータ６の内部の巻き線、ステータなどに取り付けられる。また、サーマルリレー１０は、モータ６の温度を検知してモータ６の温度に応じて開閉する。サーマルリレー１０は、モータ６の温度があらかじめ定められた温度になると制御部９によって開放される。また、サーマルリレー１０は、閉じることで多接点リレー１１に電力を供給し、開放することで多接点リレー１１の電力の供給を断つ。モータ６は、回転することでファン２を回転させ、圧縮機３を動作させる。
FIG. 2 is a diagram showing a configuration example of the motor drive control device 20 according to the embodiment. The motor drive control device 20 includes an inverter circuit 7, a control unit 9, a thermal relay 10, and a multi-contact relay 11. The inverter circuit 7 has a first switching element section and a second switching element section, each of which has one or more switching elements, and uses the power supplied from the power supply 8 to apply a direct current from the DC power supply 5. The voltage is converted into an AC voltage, and the AC voltage is applied to the motor 6. The first switching element unit is a switching element on the positive side. The second switching element unit is a switching element on the negative side. The first switching element unit may be the negative side switching element, and the second switching element unit may be the positive side switching element. The switching element on the positive side is a switching element connected to the positive electrode of the DC power supply 5. The switching element on the negative side is a switching element connected to the negative electrode of the DC power supply 5. The control unit 9 controls the inverter circuit 7 by outputting a drive signal to the inverter circuit 7, and controls the operation of the motor 6. Specifically, the drive signal is a PWM signal for PWM (Pulse Width Modulation) control of the inverter circuit 7. The thermal relay 10 is between the multi-contact relay 11 and the power supply 12, and is attached to either the outer shell or the inner surface of the motor 6. When the thermal relay 10 is mounted inside the motor 6, the thermal relay 10 is mounted on a winding, a stator, or the like inside the motor 6. Further, the thermal relay 10 detects the temperature of the motor 6 and opens and closes according to the temperature of the motor 6. The thermal relay 10 is opened by the control unit 9 when the temperature of the motor 6 reaches a predetermined temperature. Further, the thermal relay 10 supplies electric power to the multi-contact relay 11 by closing it, and cuts off the electric power supply of the multi-contact relay 11 by opening it. The motor 6 rotates to rotate the fan 2 and operate the compressor 3.
多接点リレー１１は、制御部９と第１のスイッチング素子部との間に設けられる。また、多接点リレー１１は、電源１２から電力が供給されているときには閉じ、電源１２からの電力が断たれると開放する。多接点リレー１１が閉じることで、制御部９から第１のスイッチング素子部への駆動信号は供給される。多接点リレー１１が開放されることで、制御部９と第１のスイッチング素子部と接続を断ち、制御部９から第１のスイッチング素子部への駆動信号は断たれる。なお、図２では、多接点リレー１１は、複数のスイッチング素子の正側の接続を断つように配置されている。多接点リレー１１は、単にリレーとも呼ばれる。インバータ回路７は、インバータ回路７のうち直流電源５の正側に接続されるスイッチング素子を制御するＰ側制御回路１３と、インバータ回路７のうち直流電源５の負側に接続されるスイッチング素子を制御するＮ側制御回路１４と、を備える。Ｐ側制御回路１３は、制御部９から出力される駆動信号を用いてインバータ回路７の３つのＰ側のスイッチング素子のオン、オフを制御しモータ６に印加する電圧を調整する。Ｎ側制御回路１４は、制御部９から出力される駆動信号を用いてインバータ回路７の３つのＮ側のスイッチング素子のオン、オフを制御しモータ６に印加する電圧を調整する。
The multi-contact relay 11 is provided between the control unit 9 and the first switching element unit. Further, the multi-contact relay 11 closes when the power is supplied from the power supply 12, and opens when the power from the power supply 12 is cut off. When the multi-contact relay 11 is closed, a drive signal is supplied from the control unit 9 to the first switching element unit. When the multi-contact relay 11 is opened, the connection between the control unit 9 and the first switching element unit is cut off, and the drive signal from the control unit 9 to the first switching element unit is cut off. In FIG. 2, the multi-contact relay 11 is arranged so as to disconnect the positive side of the plurality of switching elements. The multi-contact relay 11 is also simply called a relay. The inverter circuit 7 includes a P-side control circuit 13 that controls a switching element connected to the positive side of the DC power supply 5 in the inverter circuit 7, and a switching element connected to the negative side of the DC power supply 5 in the inverter circuit 7. It includes an N-side control circuit 14 for controlling. The P-side control circuit 13 controls the on / off of the three P-side switching elements of the inverter circuit 7 by using the drive signal output from the control unit 9, and adjusts the voltage applied to the motor 6. The N-side control circuit 14 controls the on / off of the three N-side switching elements of the inverter circuit 7 by using the drive signal output from the control unit 9, and adjusts the voltage applied to the motor 6.
モータ駆動制御装置２０のハードウェア構成について説明する。制御部９、Ｐ側制御回路１３、およびＮ側制御回路１４は、各処理を行う電子回路である処理回路により実現される。
The hardware configuration of the motor drive control device 20 will be described. The control unit 9, the P-side control circuit 13, and the N-side control circuit 14 are realized by a processing circuit that is an electronic circuit that performs each processing.
本処理回路は、専用のハードウェアであっても、メモリ及びメモリに格納されるプログラムを実行するＣＰＵ（Central Processing Unit、中央演算装置）を備える制御回路であってもよい。ここでメモリとは、例えば、ＲＡＭ（Random Access Memory）、ＲＯＭ（Read Only Memory）、フラッシュメモリなどの、不揮発性または揮発性の半導体メモリ、磁気ディスク、光ディスクなどが該当する。図３は、実施の形態にかかる制御回路を示す図である。本処理回路がＣＰＵを備える制御回路である場合、この制御回路は例えば、図３に示す構成の制御回路１００となる。
This processing circuit may be dedicated hardware or a control circuit including a memory and a CPU (Central Processing Unit, central processing unit) that executes a program stored in the memory. Here, the memory corresponds to, for example, a non-volatile or volatile semiconductor memory such as a RAM (Random Access Memory), a ROM (Read Only Memory), or a flash memory, a magnetic disk, an optical disk, or the like. FIG. 3 is a diagram showing a control circuit according to the embodiment. When the processing circuit is a control circuit including a CPU, the control circuit is, for example, the control circuit 100 having the configuration shown in FIG.
図３に示すように、制御回路１００は、ＣＰＵであるプロセッサ１００ａと、メモリ１００ｂとを備える。図３に示す制御回路１００により実現される場合、プロセッサ１００ａがメモリ１００ｂに記憶された、各処理に対応するプログラムを読みだして実行することにより実現される。また、メモリ１００ｂは、プロセッサ１００ａが実施する各処理における一時メモリとしても使用される。インバータ回路７が備えるスイッチング素子は、例えば、ＭＯＳＦＥＴ（Metal Oxide Semiconductor Field Effect Transistor）などの半導体素子である。
As shown in FIG. 3, the control circuit 100 includes a processor 100a, which is a CPU, and a memory 100b. When it is realized by the control circuit 100 shown in FIG. 3, it is realized by the processor 100a reading and executing the program corresponding to each process stored in the memory 100b. The memory 100b is also used as a temporary memory in each process performed by the processor 100a. The switching element included in the inverter circuit 7 is, for example, a semiconductor element such as a MOSFET (Metal Oxide Semiconductor Field Effect Transistor).
モータ駆動制御装置２０の動作について説明する。モータ６が故障し回転できない場合、モータ６は電力を動力に変換することができず、モータ６が電力を動力に変換することができる場合よりも発熱する。このため、モータ６に交流電圧が印加され続けると、モータ６の温度は上昇し、モータ６内の巻き線は、絶縁破壊する温度を超えてしまうため地絡が発生してしまう。ここで、本実施の形態では、モータ６の外殻および内部の温度があらかじめ定められた値を超えたとき、サーマルリレー１０が開放する。例えば、モータ６の外殻および内部の温度が１５０℃となったとき、または１５０℃を超えないあらかじめ定められた値のとき、サーマルリレー１０は開放する。
The operation of the motor drive control device 20 will be described. When the motor 6 fails and cannot rotate, the motor 6 cannot convert electric power into power, and generates more heat than when the motor 6 can convert electric power into power. Therefore, if the AC voltage is continuously applied to the motor 6, the temperature of the motor 6 rises, and the winding inside the motor 6 exceeds the temperature at which dielectric breakdown occurs, so that a ground fault occurs. Here, in the present embodiment, when the temperature of the outer shell and the inside of the motor 6 exceeds a predetermined value, the thermal relay 10 is opened. For example, when the temperature of the outer shell and the inside of the motor 6 reaches 150 ° C., or when the temperature does not exceed 150 ° C., the thermal relay 10 is opened.
サーマルリレー１０が開放されることにより多接点リレー１１への電源１２の電力の供給が断たれるため、多接点リレー１１が開放状態となる。多接点リレー１１が開放されるため、制御部９からＰ側制御回路１３、つまりインバータ回路７のプラス側への駆動信号が断たれるのでモータ６への電圧が印加されなくなる。モータ６への電圧が印加されなくなることにより、モータ６の巻き線は絶縁破壊する温度まで上昇することなく停止することができ、地絡が発生することを抑制できる。
When the thermal relay 10 is opened, the power supply of the power supply 12 to the multi-contact relay 11 is cut off, so that the multi-contact relay 11 is opened. Since the multi-contact relay 11 is opened, the drive signal from the control unit 9 to the P side control circuit 13, that is, the positive side of the inverter circuit 7 is cut off, so that no voltage is applied to the motor 6. By not applying the voltage to the motor 6, the winding of the motor 6 can be stopped without rising to the temperature at which dielectric breakdown occurs, and the occurrence of a ground fault can be suppressed.
以上説明したように、本実施の形態では、多接点リレー１１は、Ｐ側制御回路１３と制御部９との間に設けられるため、Ｐ側制御回路１３のみの駆動信号を断つことになる。このため、Ｎ側制御回路１４と制御部９との接続は断たれないため、インバータ回路７は残留電荷が残ることなくインバータ回路７の故障を抑制することができる。なお、本実施の形態では、多接点リレー１１は、Ｐ側制御回路１３と制御部９との間に設けられ、Ｐ側制御回路１３のみの駆動信号を断つこととしたが、多接点リレー１１は、Ｎ側制御回路１４と制御部９との間に設けられ、Ｎ側制御回路１４のみの駆動信号を断つこととしてもよい。また、多接点リレー１１は、Ｐ側制御回路１３と制御部９との間、およびＮ側制御回路１４と制御部９との間に設けられ、Ｐ側制御回路１３およびＮ側制御回路１４の駆動信号を断つこととしてもよい。
As described above, in the present embodiment, since the multi-contact relay 11 is provided between the P-side control circuit 13 and the control unit 9, the drive signal of only the P-side control circuit 13 is cut off. Therefore, since the connection between the N-side control circuit 14 and the control unit 9 is not cut off, the inverter circuit 7 can suppress the failure of the inverter circuit 7 without leaving residual charges. In the present embodiment, the multi-contact relay 11 is provided between the P-side control circuit 13 and the control unit 9, and the drive signal of only the P-side control circuit 13 is cut off. However, the multi-contact relay 11 May be provided between the N-side control circuit 14 and the control unit 9 to cut off the drive signal of only the N-side control circuit 14. Further, the multi-contact relay 11 is provided between the P-side control circuit 13 and the control unit 9 and between the N-side control circuit 14 and the control unit 9, and the P-side control circuit 13 and the N-side control circuit 14 are provided. The drive signal may be cut off.
以上の実施の形態に示した構成は、本発明の内容の一例を示すものであり、別の公知の技術と組み合わせることも可能であるし、本発明の要旨を逸脱しない範囲で、構成の一部を省略、変更することも可能である。
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 室外機、２ ファン、３ 圧縮機、４ 制御基板、５ 直流電源、６ モータ、７ インバータ回路、８，１２ 電源、９ 制御部、１０ サーマルリレー、１１ 多接点リレー、１３ Ｐ側制御回路、１４ Ｎ側制御回路、２０ モータ駆動制御装置、１００ 制御回路、１００ａ プロセッサ、１００ｂ メモリ。
1 outdoor unit, 2 fan, 3 compressor, 4 control board, 5 DC power supply, 6 motor, 7 inverter circuit, 8, 12 power supply, 9 control unit, 10 thermal relay, 11 multi-contact relay, 13 P side control circuit, 14 N side control circuit, 20 motor drive control device, 100 control circuit, 100a processor, 100b memory.
Claims (5)
- それぞれが１つ以上のスイッチング素子を備える第１のスイッチング素子部および第２のスイッチング素子部を有し、直流電圧を交流電圧に変換してモータに印加するインバータ回路と、
前記インバータ回路に駆動信号を出力することで前記インバータ回路を制御する制御部と、
前記第１のスイッチング素子部と前記制御部との間に設けられ、電力の供給がされると閉じ、閉じることで前記制御部と前記第１のスイッチング素子部とを接続し、電力の供給が断たれると開放し、開放することで前記制御部と前記第１のスイッチング素子部との接続を断ち、接続を断つことで前記駆動信号を断つリレーと、
前記モータの温度に応じて開閉し、閉じることで前記リレーに電力を供給し、前記モータの温度があらかじめ定められた値を超えたとき開放することで前記リレーの電力の供給を断つサーマルリレーと、
を備えるモータ駆動制御装置。 An inverter circuit that has a first switching element unit and a second switching element unit, each of which has one or more switching elements, converts a DC voltage into an AC voltage, and applies the DC voltage to the motor.
A control unit that controls the inverter circuit by outputting a drive signal to the inverter circuit,
It is provided between the first switching element unit and the control unit, and closes and closes when power is supplied to connect the control unit and the first switching element unit to supply electric power. A relay that opens when it is disconnected, disconnects the control unit and the first switching element unit by opening it, and disconnects the drive signal by disconnecting the connection.
A thermal relay that supplies power to the relay by opening and closing and closing according to the temperature of the motor, and cuts off the power supply of the relay by opening when the temperature of the motor exceeds a predetermined value. ,
A motor drive control device comprising. - 前記第１のスイッチング素子部は、
正側のスイッチング素子である請求項１に記載のモータ駆動制御装置。 The first switching element unit is
The motor drive control device according to claim 1, which is a switching element on the positive side. - 前記第１のスイッチング素子部は、
負側のスイッチング素子である請求項１に記載のモータ駆動制御装置。 The first switching element unit is
The motor drive control device according to claim 1, which is a switching element on the negative side. - 圧縮機を駆動させるモータと、
請求項１から３のいずれか１つに記載のモータ駆動制御装置と、
を備える空気調和機の室外機。 The motor that drives the compressor and
The motor drive control device according to any one of claims 1 to 3.
An outdoor unit of an air conditioner equipped with. - ファンを駆動させるモータと、
請求項１から３のいずれか１つに記載のモータ駆動制御装置と、
を備える空気調和機の室外機。 The motor that drives the fan and
The motor drive control device according to any one of claims 1 to 3.
An outdoor unit of an air conditioner equipped with.
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| Application Number | Priority Date | Filing Date | Title |
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| PCT/JP2019/011535 WO2020188764A1 (en) | 2019-03-19 | 2019-03-19 | Motor drive control device and outdoor unit of air conditioner |
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| Application Number | Priority Date | Filing Date | Title |
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| PCT/JP2019/011535 WO2020188764A1 (en) | 2019-03-19 | 2019-03-19 | Motor drive control device and outdoor unit of air conditioner |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05316638A (en) * | 1992-05-06 | 1993-11-26 | Fuji Electric Co Ltd | Motor protective circuit |
| JP2000002188A (en) * | 1998-06-15 | 2000-01-07 | Mitsubishi Electric Corp | Control device of air-conditioner |
| WO2016167111A1 (en) * | 2015-04-16 | 2016-10-20 | ダイキン工業株式会社 | Device for driving inverter of air-conditioner |
-
2019
- 2019-03-19 WO PCT/JP2019/011535 patent/WO2020188764A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05316638A (en) * | 1992-05-06 | 1993-11-26 | Fuji Electric Co Ltd | Motor protective circuit |
| JP2000002188A (en) * | 1998-06-15 | 2000-01-07 | Mitsubishi Electric Corp | Control device of air-conditioner |
| WO2016167111A1 (en) * | 2015-04-16 | 2016-10-20 | ダイキン工業株式会社 | Device for driving inverter of air-conditioner |
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