WO2024042598A1 - モータ駆動装置および冷凍サイクル装置 - Google Patents

モータ駆動装置および冷凍サイクル装置 Download PDF

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Publication number
WO2024042598A1
WO2024042598A1 PCT/JP2022/031667 JP2022031667W WO2024042598A1 WO 2024042598 A1 WO2024042598 A1 WO 2024042598A1 JP 2022031667 W JP2022031667 W JP 2022031667W WO 2024042598 A1 WO2024042598 A1 WO 2024042598A1
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WIPO (PCT)
Prior art keywords
wirings
wiring
inverter
switch element
inductance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2022/031667
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English (en)
French (fr)
Japanese (ja)
Inventor
嘉隆 内山
正樹 金森
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Carrier Japan Corp
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Toshiba Carrier Corp
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Filing date
Publication date
Application filed by Toshiba Carrier Corp filed Critical Toshiba Carrier Corp
Priority to JP2024542466A priority Critical patent/JP7711328B2/ja
Priority to PCT/JP2022/031667 priority patent/WO2024042598A1/ja
Priority to GB2502482.9A priority patent/GB2638084A/en
Priority to CN202280099290.2A priority patent/CN119731932A/zh
Priority to DE112022007686.0T priority patent/DE112022007686T5/de
Publication of WO2024042598A1 publication Critical patent/WO2024042598A1/ja
Priority to US19/059,486 priority patent/US20250192709A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
    • H02P25/22—Multiple windings; Windings for more than three phases
    • 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
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using DC to AC converters or inverters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B31/00—Compressor arrangements
    • F25B31/02—Compressor arrangements of motor-compressor units
    • 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
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
    • H02P25/18—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring with arrangements for switching the windings, e.g. with mechanical switches or relays
    • 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
    • H02P2209/00—Indexing scheme relating to controlling arrangements characterised by the waveform of the supplied voltage or current
    • H02P2209/03—Motors with neutral point disassociated, i.e. the windings ends are not connected directly to a common point

Definitions

  • the present invention relates to a motor drive device for a motor having a plurality of phase windings that are not connected to each other, and a refrigeration cycle device equipped with the motor drive device.
  • a drive motor for a compressor installed in a refrigeration cycle device such as an air conditioner
  • a permanent magnet synchronous motor having a plurality of phase windings and an open winding motor having a plurality of phase windings, for example three, that are not connected to each other.
  • Open-Winding Motor is known.
  • a motor drive device that drives an open winding motor includes a first inverter that controls energization to one end of each phase winding of the motor, and a first inverter that controls energization to the other end of each phase winding of the motor.
  • a second inverter is provided with one or more switches for interconnecting the other ends of each phase winding, and the closure of the switches interconnects the other ends of each phase winding.
  • the first inverter is switched independently to drive the motor as a star connection mode (also called a star connection mode), and the first and second An open winding mode is selectively set in which the inverters are switched in conjunction with each other to drive the motor.
  • the voltage applied to each phase winding can be increased to overcome the back electromotive force generated in a permanent magnet synchronous motor and drive the motor at high rotation speeds.
  • the motor can be driven with high efficiency. In other words, the motor can be driven as efficiently as possible over a wide operating range from high rotation speeds to low rotation speeds. Therefore, it is possible to both expand the operating range of the motor and improve the efficiency of the motor drive device.
  • the current (motor current) flowing between the first inverter and each phase winding passes through the switch.
  • a mechanical switching contact with a small resistance value, such as a relay contact as the switch, power loss in the switch can be reduced and motor efficiency can be improved.
  • an object of the embodiments of the present invention is to provide a motor drive device and a refrigeration cycle device with excellent safety and reliability that can suppress the potential difference between both ends of the opening/closing contact as small as possible.
  • the motor drive device of the embodiment is a motor drive device for a motor having a plurality of phase windings that are not connected to each other, and includes a plurality of series circuits of an upper switch element and a lower switch element, and both ends of these series circuits are connected to each other.
  • a first inverter connected to a DC power supply, the interconnection point of the upper switch element and lower switch element of each series circuit being connected to one end of each phase winding; the upper switch element and the lower switch element connected in series; It includes a plurality of circuits, both ends of these series circuits are connected to the DC power supply, and the interconnection point of the upper switch element and the lower switch element of each series circuit is connected to the other end of each phase winding by each first wiring.
  • a second inverter to be connected; a plurality of switching contacts connected by respective second wirings between the other ends of the respective phase windings; a plurality of switching contacts connected in parallel to each of the switching contacts by respective third wirings; a controller that controls driving of the first inverter, driving of the second inverter, and opening/closing of each of the opening/closing contacts.
  • the controller executes a pseudo-neutral point operation in which all of the upper switch elements and all of the lower switch elements of the second inverter are alternately turned on and off when opening and closing each of the switching contacts. At the same time, each semiconductor switch element is turned on.
  • Each of the first wirings has a first inductance
  • each of the second wirings has a second inductance
  • each of the third wirings has a third inductance.
  • the value of this third inductance is smaller than the total value of the first inductance and the second inductance.
  • the refrigeration cycle device of the embodiment includes a compressor driven by the motor drive device.
  • FIG. 1 is a block diagram showing the configuration of the first embodiment.
  • FIG. 2 is a flowchart showing control in the first embodiment.
  • FIG. 3 is a time chart showing the pseudo-neutral point operation and the closing operation of each switching contact, which are executed when switching from the open winding mode to the star connection mode in the first embodiment.
  • FIG. 4 is a time chart showing the pseudo-neutral point operation and the opening operation of each switching contact that are executed when switching from the star connection mode to the open winding mode in the first embodiment.
  • FIG. 5 is a time chart showing on/off of each switch element in the pseudo-neutral point operation of FIGS. 3 and 4 in a temporally enlarged manner.
  • FIG. 6 is a diagram showing the flow of current during dead time in the first embodiment.
  • FIG. 7 is a diagram showing changes in voltage and potential difference at various parts when the current shown in FIG. 6 flows.
  • FIG. 8 is a diagram showing other changes in voltage and potential difference at various parts when the current shown in FIG. 6 flows.
  • FIG. 9 is a block diagram showing the configuration of the second embodiment.
  • FIG. 10 is a block diagram showing main parts of the configuration of the third embodiment.
  • FIG. 11 is a block diagram showing main parts of the configuration of the fourth embodiment.
  • a motor drive circuit 2 is connected to a three-phase AC power source 1, and a motor 3 and a controller 4 are connected to the output end of the motor drive circuit 2.
  • the motor 3 is a compressor drive motor that drives a compressor of an air conditioner, which is a refrigeration cycle device.
  • the motor 3 is a three-phase permanent magnet synchronous motor for driving a compressor that has three phase windings Lu, Lv, and Lw that are not connected to each other, and specifically, one end of each of the phase windings Lu, Lv, and Lw.
  • This is a so-called open-winding motor, which includes three terminals 31u, 31v, and 31w, and three terminals 32u, 32v, and 32w, which are the other ends of the phase windings Lu, Lv, and Lw, respectively.
  • the motor drive circuit 2 includes a DC power source, for example, a converter 10, connected to a three-phase AC power source 1, a positive power line C1 and a negative power line C2 connected to the output end of the converter 10, and a positive power line C1 and a negative power line C2. It includes an inverter (first inverter) 20 and an inverter (second inverter) 30 connected between negative side power supply lines C2.
  • the converter 10 is, for example, a full-wave rectifier or a PWM converter, and converts the AC voltage of the three-phase AC power supply 1 into a DC voltage.
  • the inverter 20 controls energization to the terminals 31u, 31v, and 31w, which are one ends of the phase windings Lu, Lv, and Lw of the open-winding motor 3, respectively.
  • the inverter 30 controls energization to the terminals 32u, 32v, and 32w, which are the other ends of the phase windings Lu, Lv, and Lw of the open-winding motor 3, respectively.
  • a DC link common system configuration is adopted in which converter 10 serves as a common DC power source for inverters 20 and 30.
  • the inverter 20 includes a U-phase series circuit formed by connecting an upper switch element Tu and a lower switch element Tx in series, a V-phase series circuit formed by connecting an upper switch element Tv and a lower switch element Ty in series, and an upper switch element Tw.
  • This is a so-called three-phase inverter including a W-phase series circuit formed by connecting a lower switching element Tz and a lower switching element Tz in series.
  • One end of each of the U-phase series circuit, V-phase series circuit, and W-phase series circuit is connected to the positive side power supply line C1, and the other end of each of the U-phase series circuit, V-phase series circuit, and W-phase series circuit is connected to the negative side power supply line. Connected to C2.
  • An interconnection point Au between the upper switch element Tu and the lower switch element Tx is connected to a terminal 31u, which is one end of the phase winding Lu, by a wiring 51u such as a lead wire or a conductive pattern.
  • An interconnection point Av between the upper switch element Tv and the lower switch element Ty is connected to a terminal 31v, which is one end of the phase winding Lv, by a wiring 51v such as a lead wire or a conductive pattern.
  • An interconnection point Az between the upper switch element Tw and the lower switch element Tz is connected to a terminal 31w, which is one end of the phase winding Lz, by a wiring 51w such as a lead wire or a conductive pattern.
  • the inverter 30 has the same circuit configuration as the inverter 20, including a U-phase series circuit consisting of an upper switching element Tu and a lower switching element Tx connected in series, and a V-phase series circuit consisting of an upper switching element Tv and a lower switching element Ty connected in series.
  • This is a so-called three-phase inverter including a W-phase series circuit formed by connecting an upper switching element Tw and a lower switching element Tz in series.
  • One end of each of the U-phase series circuit, V-phase series circuit, and W-phase series circuit is connected to the positive side power supply line C1, and the other end of each of the U-phase series circuit, V-phase series circuit, and W-phase series circuit is connected to the negative side power supply line. Connected to C2.
  • An interconnection point Bu between the upper switch element Tu and the lower switch element Tx is connected to the terminal 32u, which is the other end of the phase winding Lu, by a wiring (first wiring) 52u such as a lead wire or a conductive pattern.
  • An interconnection point Bv between the upper switch element Tv and the lower switch element Ty is connected to the terminal 32v, which is the other end of the phase winding Lv, by a wiring (first wiring) 52v such as a lead wire or a conductive pattern.
  • An interconnection point Bw between the upper switch element Tw and the lower switch element Tz is connected to the terminal 32w, which is the other end of the phase winding Lz, by a wiring (first wiring) 52w such as a lead wire or a conductive pattern.
  • All the switch elements Tu to Tz of the inverters 20 and 30 are IGBTs in which a freewheeling diode (also referred to as a free wheel diode) D is connected in antiparallel to the main body of the switch element.
  • a freewheeling diode also referred to as a free wheel diode
  • MOS-FETs or the like may be used as each of the switch elements Tu to Tz.
  • the inverter 20 actually includes a main circuit formed by bridge-connecting a U-phase series circuit, a V-phase series circuit, and a W-phase series circuit, and peripheral circuits such as a drive circuit that drives each switch element of this main circuit.
  • This is a module housed in a single package, a so-called IPM (Intelligent Power Module).
  • IPM Intelligent Power Module
  • Inverter 30 is also an IPM.
  • inverters 20 and 30 in which all the switch elements Tu to Tz and drive circuits are configured as discrete components may be used.
  • the inverter is not limited to a three-phase inverter, and only needs to be capable of switching six phases, so the two three-phase inverters 20 and 30 may be configured with three single-phase inverters.
  • phase winding Lu terminal 32u
  • other end of the phase winding Lv terminal 32v
  • motor 1M The other end of the phase winding Lu (terminal 32u) and the other end of the phase winding Lv (terminal 32v) of the motor 1M are connected by wiring (second wiring) 53u and 53v such as lead wires and conductive patterns to
  • a normally open first switching contact (referred to as a relay contact) 12a of a relay 12 is connected to the switch having a switching contact of the type shown in FIG.
  • the machine is connected between the other end of the phase winding Lv (terminal 32v) and the other end of the phase winding Lw (terminal 32w) of the motor 1M by wiring (second wiring) 53v, 53w such as a lead wire or a conductive pattern.
  • a normally open second switching contact (referred to as a relay contact) 13a of a relay 13 is connected to the switch having a switching contact of the type shown in FIG.
  • the relays 12 and 13 are controlled by the controller 4 to be turned on (energized) by supplying an excitation current and turned off (deenergized) by cutting off the excitation current in synchronization with each other. Therefore, instead of the two relays 12 and 13, one relay including two relay contacts may be used.
  • the relay contacts 12a and 13a are closed, and the other end of the phase winding Lu and the other end of the phase winding Lv are interconnected via the relay contact 12a, and The other end of the phase winding Lv and the other end of the phase winding Lw are interconnected via a relay contact 13a.
  • the phase windings Lu, Lv, and Lw are in a star connection state (also referred to as a star connection state).
  • the relay contacts 12a and 13a are opened, and the phase windings Lu, Lv, and Lw are in a disconnected state where they are separated from each other, that is, an open winding state where they are electrically separated. .
  • auxiliary switches SW1 and SW2 are connected in parallel to the relay contact 12a through wiring (third wiring) 54u and 54v such as lead wires and conductive patterns.
  • a series circuit of auxiliary switches SW3 and SW4 is connected in parallel to the relay contact 13a through wiring (third wiring) 54v and 54w such as lead wires and conductive patterns.
  • one end of a series circuit of auxiliary switches SW1 and SW2 is connected via a wiring 54u to a connection point N1 between the wiring 53u and one end of the relay contact 12a.
  • the other end of the series circuit of auxiliary switches SW1 and SW2 is connected to the connection point N2 between the wiring 53v and the other end of the relay contact 12a (and one end of the relay contact 12b) via the wiring 54v, and the same wiring 54v
  • One end of a series circuit of auxiliary switches SW3 and SW4 is connected through the switch.
  • the other end of the series circuit of auxiliary switches SW3 and SW4 is connected to the connection point N3 between the wiring 53w and the other end of the relay contact 12b via the wiring 54w.
  • Connection points N1, N2, and N3 are branch points from wirings 53u, 53v, and 53w to wirings 54u, 54v, and 54w.
  • connection points N1, N2, and N3 will be referred to as branch points N1, N2, and N3.
  • the wirings 53u, 53v, and 53w start from the terminals 32u, 32v, and 32w, which are the other ends of the motor windings Lu, Lv, and Lw, and end at branch points N1, N2, and N3.
  • the first and second wiring lines 54u and 54v start from the branch points N1 and N2 and end at both ends of the series circuit of the auxiliary switches Sw1 and Sw2.
  • the second and third wiring lines 54v and 54w start from the branch points N2 and N3 and end at both ends of the series circuit of the auxiliary switches Sw3 and Sw4.
  • the auxiliary switches SW1 to SW4 are semiconductor switch elements in which a freewheeling diode D is connected to the main body of each element in an antiparallel direction.
  • the series circuit of auxiliary switches SW1 and SW2 is connected such that the auxiliary switches SW1 and SW2 are oriented in opposite directions. That is, the outputs (current outflow sides) of both the auxiliary switches SW1 and SW2 are connected to each other.
  • the series circuit of auxiliary switches SW3 and SW4 is also connected in such a manner that the auxiliary switches SW3 and SW4 are oriented in opposite directions.
  • the wiring 52u between the interconnection point Bu of the inverter 30 and the other end (terminal 32u) of the phase winding Lu has a first inductance (parasitic inductance) Lsu1.
  • the wiring 53u between the other end (terminal 32u) of the phase winding Lu and the branch point N1 has a second inductance (parasitic inductance) Lsu2.
  • the wiring 52v between the interconnection point Bv of the inverter 30 and the other end (terminal 32v) of the phase winding Lv has a first inductance (parasitic inductance) Lsv1.
  • the wiring 53v between the other end (terminal 32v) of the phase winding Lv and the branch point N2 has a second inductance Lsv2.
  • the wiring 52w between the interconnection point Bw of the inverter 30 and the other end (terminal 32w) of the phase winding Lw has a first inductance (parasitic inductance) Lsw1.
  • the wiring 52w between the other end (terminal 32w) of the phase winding Lw and the branch point N3 has a second inductance Lsw2.
  • the first inductances Lsu1, Lsv1, and Lsw1 have approximately the same value, but may differ slightly in magnitude depending on how the wirings 52u, 52v, and 52w are routed.
  • the second inductances Lsu2, Lsv2, and Lsw2 have approximately the same value, but may differ slightly in magnitude depending on how the wirings 53u, 53v, and 53w are routed.
  • the wiring 54u between the branch point N1 and one end of the series circuit of auxiliary switches SW1 and SW2 has a third inductance (parasitic inductance) Lsu3.
  • the wiring 54v has a third inductance Lsv3 between the branch point N2 and the other ends of the auxiliary switches SW1 and SW2, and also has the same third inductance Lsv3 between the branch point N2 and one end of the auxiliary switches SW3 and SW4. have.
  • the third inductance Lsv3 of the wiring 54v is generally connected from the branch point N2 to the connection between the auxiliary switch SW2 and the auxiliary switch SW3.
  • the inductance of the wiring between points is dominant.
  • the wiring 54w between the branch point N3 and the other end of the series circuit of auxiliary switches SW3 and SW4 has a third inductance Lsw3.
  • the relay contact 12a is connected between the branch points N1 and N2, and a series circuit of auxiliary switches SW1 and SW2 is connected between the branch points N1 and N2.
  • a relay contact 13a is connected between the branch points N2 and N3, and a series circuit of auxiliary switches SW3 and SW4 is connected between the branch points N2 and N3.
  • Current sensors 11u, 11v, 11w are connected to wirings 51, 51v, 51z between mutual connection points Au, Av, Az of inverter 20 and one ends (terminals 31u, 31v, 31z) of phase windings Lu, Lv, Lw, respectively.
  • the output signals of these current sensors are sent to the controller 4.
  • Current sensors 11u, 11v, and 11w detect currents (referred to as motor currents) Iu, Iv, and Iw flowing through phase windings Lu, Lv, and Lw (referred to as motor currents).
  • the controller 4 includes a main control section 40, a current detection section 41, a relay drive section 42, and an auxiliary SW drive section 43, and the rotation speed N of the motor 3 is commanded from a higher-level external device (for example, an air conditioner control device).
  • a higher-level external device for example, an air conditioner control device.
  • the opening/closing of relay contacts 12a and 13a and the driving (switching) of inverters 20 and 30 are controlled so that the target rotational speed Nt is achieved and highly efficient operation is achieved.
  • the current detection unit 41 detects instantaneous values of the motor currents Iu, Iv, and Iw detected by the current sensors 11u, 11v, and 11w.
  • Relay drive section 42 drives relays 12 and 13 in response to commands from main control section 40 .
  • the auxiliary SW driving section 43 drives the auxiliary switches SW1 to SW4 in accordance with commands from the main control section 40.
  • the main control unit 40 is composed of a microcomputer and its peripheral circuits, and has a star connection that interconnects the other ends of the phase windings Lu, Lv, and Lw by closing the relay contacts 12a and 13a to drive the inverter 20 independently. mode, and an open winding mode in which the other ends of the phase windings Lu, Lv, and Lw are disconnected from each other by opening the relay contacts 12a and 13a, and the inverters 20 and 30 are driven in conjunction with each other, depending on the size of the load. It is selectively set according to the values of the corresponding motor currents Iu, Iv, Iw, etc.
  • the star connection mode is set, and the motor rotation speed N increases and the motor currents Iu, Iv, Iw become the predetermined values.
  • the load exceeds the value, set open winding mode.
  • the star connection mode and the open winding mode can be selected by making judgments using various parameters related to the motor, such as a combination of motor rotation speed and field weakening amount, in addition to the above.
  • the star connection mode and the open winding mode can be selected by making judgments using various parameters related to the motor, such as a combination of motor rotation speed and field weakening amount, in addition to the above.
  • under abnormal conditions such as when the motor currents Iu, Iv, and Iw become overcurrent, it is also possible to preferentially switch to one of the star connection mode and open winding mode. .
  • the main control unit 40 is configured such that the potential difference between both ends of the relay contact 12a and the potential difference between both ends of the relay contact 13a is zero when switching from the open winding mode to the star connection mode and from the star connection mode to the open winding mode.
  • a pseudo-neutral point operation is performed in which all the upper switching elements Tu, Tv, Tw and all the lower switching elements Tx, Ty, Tz in the inverter 30 are alternately turned on and off with an on/off duty of 50% so that Execute.
  • the main control unit 40 turns on the relays 12 and 13 with the auxiliary switches SW1 to SW4 turned on in advance, and After a certain time t1, which is longer than the time required for relay contacts 12a and 13a to close, has elapsed, auxiliary switches SW1 to SW4 are turned off.
  • main control unit 40 turns off relays 12 and 13 with auxiliary switches SW1 to SW4 turned on in advance, and After a certain time t2, which is longer than the time required for the relay contacts 12a and 13a to open, has elapsed, the auxiliary switches SW1 to SW4 are turned off.
  • the main control unit 40 controls the lower side switch element to turn on when the upper side switch element turns on in each series circuit.
  • a complementary operation is performed in which the side switch element is turned off and when the lower side switch element is turned on in each series circuit, the upper side switch element is turned off.
  • the main control unit 40 controls the upper switching element and the lower switching element in the on/off drive so that the upper switching element and the lower switching element of each series circuit are not simultaneously turned on and a short circuit is formed.
  • a dead time td in which both switch elements are in an off state is ensured. Note that the dead time td is always provided not only during the pseudo-neutral point operation but also during PWM control during normal operation to prevent short circuits between the upper and lower switch elements.
  • Steps S1, S2... in the flowchart are simply abbreviated as S1, S2....
  • the main control unit 40 monitors whether it is necessary to switch to the star connection mode in response to a decrease in load (S2). If switching to star connection mode is not necessary (NO in S2), the main control unit 40 repeats the determination in S1 above.
  • the main control unit 40 switches all upper switch elements Tu and Tv in the inverter 30 so that the potential difference between both ends of the relay contacts 12a and 13a becomes zero. , Tw and all the lower switching elements Tx, Ty, and Tz are alternately turned on and off with an on/off duty of 50% as shown in FIG. 3 (S3).
  • the relationship between the on/off of the upper switching elements Tu, Tv, Tw and the on/off of the lower switching elements Tx, Ty, Tz in this pseudo-neutral point operation is shown enlarged in time to make it easier to understand. is shown in FIG.
  • the main control unit 40 controls the upper switching elements Tu, Tv in order to prevent formation of a short circuit to the output terminal of the converter 10 when turning on the upper switching elements Tu, Tv, Tw and turning off the lower switching elements Tx, Ty, Tz. , Tw and the lower switching elements Tx, Ty, and Tz are all kept in an off state, ensuring a dead time td.
  • the main control unit 40 controls the lower switching elements to prevent formation of a short circuit to the output terminal of the converter 10.
  • a dead time td is ensured in which the elements Tx, Ty, Tz and the upper switching elements Tu, Tv, Tw are all in the OFF state.
  • the general method is to turn off the switch element that should be turned off, and then turn on the switch element that should be turned on after the dead time td has elapsed. It is. It is desirable to make the dead time td as short as possible from the viewpoint of efficiency and waveforming, and in reality, the minimum time is allocated based on the on/off transient characteristics of the switching element.
  • the main control unit 40 first turns on the auxiliary switches SW1 to SW4 (S4), thereby short-circuiting both ends of the relay contacts 12a and 13a, and after the short-circuiting, the relays 12 and 13 Turn on (S5).
  • the main control unit 40 turns off the auxiliary switches SW1 to SW4 (S7) after a certain time t1, which is longer than the time required for the relay contacts 12a and 13a to actually close, has elapsed (YES in S6). ). Thereafter, the main control unit 40 ends the pseudo-neutral point operation and shifts to motor drive in star connection mode (S8).
  • the main control unit 40 returns to the determination in S1 above.
  • Turning on the auxiliary switches SW1 to SW4 in step S4 and turning off the auxiliary switches SW1 to SW4 in step S7 is desirable from the viewpoint of circuit simplification to turn on and off all the auxiliary switches in synchronization. There is no need to turn it on and off in sync with the The point is that all the auxiliary switches SW1 to SW4 can be turned on before the relay contacts 12a and 13a actually close, and all the auxiliary switches SW1 to SW4 can be turned off after the relay contacts 12a and 13a are actually closed.
  • the operation shown in FIG. 3 is executed.
  • the auxiliary switches SW1 to SW4 are turned off, so power consumption when the auxiliary switches SW1 to SW4 are on is eliminated, saving energy and reducing the heat generation of the auxiliary switches SW1 to SW4. Therefore, there is no need to take measures against the temperature rise of these semiconductor switches.
  • the main control unit 40 monitors whether it is necessary to switch to open winding mode in response to an increase in load (S9). If switching to open winding mode is not necessary (NO in S9), the main control unit 40 returns to the determination in S1 above.
  • the main control unit 40 switches the upper switch elements Tu, Tv, A pseudo-neutral point operation is performed in which Tw and the lower switching elements Tx, Ty, and Tz are alternately turned on and off with an on/off duty of 50% as shown in FIG. 4 (S10).
  • This pseudo-neutral point operation is the same as the pseudo-neutral point operation when switching from open winding mode to star connection mode. Note that in this state, the relay contacts 12a and 13a are on because the operation is in star connection mode.
  • the main control unit 40 first turns on the auxiliary switches SW1 to SW4 (S11), thereby short-circuiting both ends of the relay contacts 12a and 13a, and after the short-circuiting, the relay 12, 13 is turned off (S12).
  • the main control unit 40 turns off the auxiliary switches SW1 to SW4 after a certain time t2, which is longer than the time required for the relay contacts 12a and 13a to actually open (S13: YES), turns off the auxiliary switches SW1 to SW4 (S14). .
  • the main control unit 40 ends the pseudo-neutral point operation and shifts to open winding mode (S15).
  • the main control unit 40 returns to the determination in S1 above.
  • Turning on the auxiliary switches SW1 to SW4 in step S11 and turning off the auxiliary switches SW1 to SW4 in step S14 is desirable to turn on and off all the auxiliary switches SW1 to SW4 in synchronization. /No need to turn it off. It is only necessary that all the auxiliary switches SW1 to SW4 be turned on before the relay contacts 12a and 13a actually open, and all the auxiliary switches SW1 to SW4 can be turned off after the relay contacts 12a and 13a are actually opened. Through the above processing, the operation shown in FIG. 4 is executed.
  • the fixed times t1 and t2 may be the same time, and from the viewpoint of efficiency, it is desirable to make them as short as possible.
  • mechanical relays 12 and 13 there is a delay of 10 to 30 msec between turning on (energizing) and turning off (deenergizing) by the excitation current until the relay contacts 12a and 13a actually open and close.
  • FIG. 7 shows the relationship between Vuv2 and the potential difference Vuv3 across the series circuit of the auxiliary switches Sw1 and Sw2. That is, when the collector-emitter voltage Vcex of the lower switch element Tx is zero, the collector-emitter voltage Vcey of the lower switch element Ty rises, and as a result, the potential difference Vuv1 between the interconnection points Bu and Bv ceases to be zero. .
  • the opening/closing timing cannot be controlled strictly as described above, so the relay contact 12a may open/close at a timing when the potential difference Vuv2 between both ends of the relay contact 12a is not zero. If the relay contact 12a opens and closes in a state where the potential difference Vuv2 between both ends of the relay contact 12a is not zero, a surge voltage or an arc may occur between both ends of the relay contact 12a. Since the dead time td is extremely short compared to the regular on/off period of the inverter 30, it is extremely unlikely that the relay contact 12a will actually open or close when the potential difference between both ends of the relay contact 12a is not zero. low. However, since the probability of its occurrence is not 0, some kind of countermeasure is required.
  • the potential difference Vuv2 between both ends of the relay contact 12a is the sum of the value of the first inductance Lsu1 of the wiring 52u and the value of the second inductance Lsu2 of the wiring 53u from the interconnection point Bu to the branch point N1.
  • the potential difference Vuv2 can be suppressed to be smaller than in the case of FIG.
  • the potential difference Vvw2 between both ends of the relay contact 13a is the sum of the first inductance Lsv1 of the wiring 52v and the second inductance Lsv2 of the wiring 53v from the interconnection point Bv to the branch point N2.
  • the value of the third inductance Lsu2 is smaller than the total value "Lsu1+Lsu2" of the value of the first inductance Lsu1 and the value of the second inductance Lsu2 (Lsu1 ⁇ "Lsu1+Lsu2"),
  • the value of inductance Lsv2 is smaller than the sum of "Lsv1+Lsv2" of the value of first inductance Lsv1 and the value of second inductance Lsv2 (Lsv1 ⁇ "Lsv1+Lsv2")
  • the value of third inductance Lsw2 is the same as the value of first inductance Lsw1.
  • each wiring (third wiring) 54u, 54v, 54w is set so that the total value of the two inductances Lsw2 is smaller than "Lsw1+Lsw2" (Lsw1 ⁇ "Lsw1+Lsw2"), and thus the potential difference Vuv2, Vvw2 is small. It is set as short as possible from the total length of each wiring (first wiring) 52u, 52v, 52w and each wiring (second wiring) 53u, 53v, 53w. For example, by bringing the relay contacts 12a, 13a and the auxiliary switches SW1 to SW4 as close as possible, the lengths of the wirings 54u, 54v, 54w can be shortened.
  • the value of parasitic inductance occurring in wiring such as first inductance Lsu1, Lsv1, Lsw1, second inductance Lsu2, Lsv2, Lsw2, and third inductance Lsu3, Lsv3, Lsw3 is approximately proportional to the length of the wiring.
  • the magnitudes of the potential differences Vuv2 and Vvw2 between both ends of the relay contacts 12a and 13a, respectively, are determined by the relative relationship between the above total values "Lsu1+Lsu2", “Lsv1+Lsv2”, “Lsw1+Lsw2” and the values of the third inductances Lsu3, Lsv3, and Lsw3. Therefore, even if the total values “Lsu1+Lsu2”, “Lsv1+Lsv2”, and “Lsw1+Lsw2” are larger than the values of the third inductances Lsu3, Lsv3, and Lsw3, it is possible to keep the potential differences Vuv2 and Vvw2 small.
  • FIG. 9 shows the configuration of the second embodiment.
  • Wiring (third wiring) is connected between branch points N1 and N2 at the tips of wiring (second wiring) 53u and 53v connected to the other ends (terminals 32u and 32v) of phase windings Lu and Lv of motor 1M.
  • a series circuit of auxiliary switches SW1 and SW2 is connected via 54u and 54v1.
  • a wire (third wire) is connected between the branch points N2 and N3 at the tips of the wires (second wire) 53v and 53w connected to the other ends (terminals 32v and 32w) of the phase windings Lv and Lw of the motor 1M.
  • a series circuit of auxiliary switches SW3 and SW4 is connected via 54v2 and 54w.
  • a relay contact 12a is connected between the branch points N1 and N2 via wiring (fourth wiring) 55u and 55v.
  • a relay contact 13a is connected between branch points N2 and N3 via wiring (fourth wiring) 55v and 55w.
  • the tip of the wiring 53u branches into a wiring 54u and a wiring 55u at a branch point N1
  • the tip of the wiring 53v branches into three wirings, 54v1, 54v2, and a wiring 55v, at a branching point N2.
  • the tip of the wiring 53w branches into a wiring 54w and a wiring 55w at a branch point N3.
  • the wiring 54u is connected to the auxiliary switch SW1 side in the series circuit of auxiliary switches SW1 and SW2, and the wiring 54v1 is connected to the auxiliary switch SW2 side in the series circuit of auxiliary switches SW1 and SW2.
  • the wiring 54v2 is connected to the auxiliary switch SW3 side in the series circuit of auxiliary switches SW3 and SW4, and the wiring 54w is connected to the auxiliary switch SW4 side in the series circuit of auxiliary switches SW3 and SW4.
  • the auxiliary switches SW2 and SW3 are connected in series to each other via the branch point N2 and the wirings 54v1 and 54v2.
  • wires 54u and 54v1 start from the branch points N1 and N2 and end at both ends of the series circuit of the auxiliary switches SW1 and SW2.
  • Wiring lines 54v2 and 54w start from branch points N2 and N3 and end at both ends of the series circuit of auxiliary switches SW2 and SW3.
  • the relay contact 12a is connected in parallel to the series circuit of the auxiliary switches SW1 and SW2 via wires 55u and 55v.
  • Relay contact 13a is connected in parallel to the series circuit of auxiliary switches SW3 and SW4 via wiring 55v and 55w.
  • the wire 55u is electrically connected to the wire 53u via the branch point N1
  • the wire 55v is electrically connected to the wire 53v via the branch point N2
  • the wire 55w is electrically connected to the wire 53w via the branch point N2.
  • the other end of the relay contact 12a and one end of the relay contact 13a are electrically connected via a common connection point P1 connected to the wiring 55v.
  • Wiring lines 55u and 55v start from branch points N1 and N2 and end at both ends of relay contact 12a.
  • Wiring lines 55v and 55w start from branch points N2 and N3 and end at both ends of relay contact 12a.
  • the length of the wirings 54u to 54w can be extremely shortened in terms of the circuit configuration, so the above conditions can be satisfied without having to perform a troublesome wiring design. I can do it.
  • the other configurations are the same as the first embodiment.
  • FIG. 10 shows the main part of the configuration of the third embodiment.
  • a relay contact 12a is connected between branch points N1 and N2 at the tips of wires 53u and 53v connected to the other ends (terminals 32u and 32v) of phase windings Lu and Lv of the motor 1M.
  • a relay contact 13a is connected between branch points N2 and N3 at the tips of wires 53v and 53w connected to the other ends (terminals 32v and 32w) of the phase windings Lv and Lw of the motor 1M.
  • a series circuit of auxiliary switches SW1 and SW2 is connected in parallel to the relay contact 12a through wiring 54u and 54v connected to the branch points N1 and N2.
  • a series circuit of auxiliary switches SW2 and SW3 is connected in parallel to relay contact 13a through wiring 54v and 54w connected to branch points N2 and N3.
  • the auxiliary switches SW1 to SW3 are semiconductor switching elements, such as IGBTs and MOS-FETs, each of which has a freewheeling diode D connected in antiparallel direction to its respective element body.
  • the emitters of the three auxiliary switches SW1, SW2, and SW3 are commonly connected at a common connection point (virtual neutral point) P2 in the figure.
  • the first wiring 54u and the second wiring 54v start from the branch points N1 and N2 and end at both ends of the series circuit of the auxiliary switches SW1 and SW2.
  • the second wiring 54v and the third wiring 54w start from the branch points N2 and N3 and end at both ends of the series circuit of the auxiliary switches SW2 and SW3.
  • the other configurations are the same as the first embodiment, including the relationship between the values of the first inductances Lsu1, Lsv1, Lsw1, the values of the second inductances Lsu2, Lsv2, Lsw2, and the values of the third inductances Lsu3, Lsv3, Lsw3. It is.
  • the three auxiliary switches SW1, SW2, and SW3 are simultaneously controlled on and off in the same way as the four auxiliary switches SW1 to SW4 in the first embodiment.
  • the number of auxiliary switches SW1, SW2, SW3, that is, the number of semiconductor switch elements can be reduced to three, and the number of semiconductor switch elements is smaller than in the first and second embodiments. can be simplified.
  • FIG. 11 shows the main part of the configuration of the fourth embodiment.
  • Wiring (third wiring) is connected between branch points N1 and N2 at the tips of wiring (second wiring) 53u and 53v connected to the other ends (terminals 32u and 32v) of phase windings Lu and Lv of motor 1M.
  • a series circuit of auxiliary switches SW1 and SW2 is connected by 54u and 54v.
  • a wire (third wire) is connected between the branch points N2 and N3 at the tips of the wires (second wire) 53v and 53w connected to the other ends (terminals 32v and 32w) of the phase windings Lv and Lw of the motor 1M.
  • a series circuit of auxiliary switches SW2 and SW3 is connected by 54v and 54w.
  • the relay contact 12a is connected in parallel to the series circuit of the auxiliary switches SW1 and SW2 through wiring (fourth wiring) 55u and 55v connected to the branch points N1 and N2.
  • the relay contact 13a is connected in parallel to the series circuit of the auxiliary switches SW2 and SW3 through wiring (fourth wiring) 55v and 55w connected to the branch points N2 and N3.
  • the other end of the relay 12a connected to the wiring 55v and one end of the relay 13a connected to the wiring 55v are connected at a common connection point P1.
  • the first wiring 54u and the second wiring 54v start from the branch points N1 and N2 and end at both ends of the series circuit of the auxiliary switches SW1 and SW2.
  • the second wiring 54v and the third wiring 54w start from the branch points N2 and N3 and end at both ends of the series circuit of the auxiliary switches SW2 and SW3.
  • the first wiring 55u and the second wiring 55v start from branch points N1 and N2 and end at both ends of the relay contact 12a.
  • the second wiring 55v and the third wiring 55w start from branch points N2 and N3 and end at both ends of the relay contact 13a.
  • the other configurations are the same as the first embodiment, including the relationship between the values of the first inductances Lsu1, Lsv1, Lsw1, the values of the second inductances Lsu2, Lsv2, Lsw2, and the values of the third inductances Lsu3, Lsv3, Lsw3. It is.
  • the three auxiliary switches SW1, SW2, and SW3 are simultaneously controlled on and off in the same way as the four auxiliary switches SW1 to SW4 in the first embodiment.
  • the number of auxiliary switches SW1, SW2, SW3, that is, the number of semiconductor switch elements can be reduced to three, and the number of semiconductor switch elements is smaller than in the first and second embodiments. can be simplified.
  • 2 ... Drive circuit, 3... Open winding motor, Lu, Lv, Lw... Phase winding, 4... Controller, 12, 13... Relay (switch), 12a, 13a... Switching contact (relay contact), SW1 to SW4 ...Semiconductor switch element, Lsu1, Lsv1, Lsw1...First inductance, Lsu2, Lsv2, Lsw2...Second inductance, 20...Inverter (first inverter), 30...Inverter (second inverter), 40... Main control unit

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Inverter Devices (AREA)
  • Control Of Ac Motors In General (AREA)
  • Control Of Multiple Motors (AREA)
PCT/JP2022/031667 2022-08-23 2022-08-23 モータ駆動装置および冷凍サイクル装置 Ceased WO2024042598A1 (ja)

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JP2024542466A JP7711328B2 (ja) 2022-08-23 2022-08-23 モータ駆動装置および冷凍サイクル装置
PCT/JP2022/031667 WO2024042598A1 (ja) 2022-08-23 2022-08-23 モータ駆動装置および冷凍サイクル装置
GB2502482.9A GB2638084A (en) 2022-08-23 2022-08-23 Motor driving device and cooling cycle device
CN202280099290.2A CN119731932A (zh) 2022-08-23 2022-08-23 电机驱动装置及冷冻循环装置
DE112022007686.0T DE112022007686T5 (de) 2022-08-23 2022-08-23 Motorantriebsvorrichtung und Kühlkreislaufvorrichtung
US19/059,486 US20250192709A1 (en) 2022-08-23 2025-02-21 Motor driving device and cooling cycle device

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019070068A1 (ja) * 2017-10-06 2019-04-11 日本電産株式会社 モータモジュールおよび電動パワーステアリング装置
JP2021090240A (ja) * 2019-12-02 2021-06-10 株式会社Ｓｏｋｅｎ 回転電機システム
WO2021166187A1 (ja) * 2020-02-20 2021-08-26 三菱電機株式会社 空気調和装置
JP2022052388A (ja) * 2020-09-23 2022-04-04 株式会社デンソー 電力変換装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019070068A1 (ja) * 2017-10-06 2019-04-11 日本電産株式会社 モータモジュールおよび電動パワーステアリング装置
JP2021090240A (ja) * 2019-12-02 2021-06-10 株式会社Ｓｏｋｅｎ 回転電機システム
WO2021166187A1 (ja) * 2020-02-20 2021-08-26 三菱電機株式会社 空気調和装置
JP2022052388A (ja) * 2020-09-23 2022-04-04 株式会社デンソー 電力変換装置

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US20250192709A1 (en) 2025-06-12
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JPWO2024042598A1 (https=) 2024-02-29
JP7711328B2 (ja) 2025-07-22

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