WO2020188886A1 - Dispositif de conversion de puissance, système de commande d'entraînement, dispositif d'apprentissage automatique et procédé de surveillance de moteur - Google Patents

Dispositif de conversion de puissance, système de commande d'entraînement, dispositif d'apprentissage automatique et procédé de surveillance de moteur Download PDF

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Publication number
WO2020188886A1
WO2020188886A1 PCT/JP2019/045711 JP2019045711W WO2020188886A1 WO 2020188886 A1 WO2020188886 A1 WO 2020188886A1 JP 2019045711 W JP2019045711 W JP 2019045711W WO 2020188886 A1 WO2020188886 A1 WO 2020188886A1
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WIPO (PCT)
Prior art keywords
current
unit
frequency
motor
current frequency
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PCT/JP2019/045711
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English (en)
Japanese (ja)
Inventor
憲和 服部
規央 鈴木
田中　哲夫
直人 法名
崇弘 原田
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三菱電機株式会社
Priority date (The priority date 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 date listed.)
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Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to JP2020515994A priority Critical patent/JP6704560B1/ja
Priority to CN201980093995.1A priority patent/CN113574791B/zh
Priority to DE112019006863.6T priority patent/DE112019006863T5/de
Priority to US17/429,635 priority patent/US11362614B2/en
Publication of WO2020188886A1 publication Critical patent/WO2020188886A1/fr

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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
    • H02P6/14—Electronic commutators
    • H02P6/16—Circuit arrangements for detecting position
    • H02P6/18—Circuit arrangements for detecting position without separate position detecting elements
    • 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
    • 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
    • H02P6/08—Arrangements for controlling the speed or torque of a single motor

Definitions

  • the present invention relates to a power conversion device for supplying electric power to a motor, a drive control system, a machine learning device, and a motor monitoring method.
  • power converters that supply power to motors are required to comply with functional safety standards such as IEC (International Electrotechnical Commission) 61508 or ISO (International Organization for Standardization) 13849, which are international standards.
  • functional safety standards such as IEC (International Electrotechnical Commission) 61508 or ISO (International Organization for Standardization) 13849, which are international standards.
  • power converters are required to support safety speed monitoring (SLS: Safety Limited Speed), which is one of the functional safety standards.
  • Safe speed monitoring is a function to monitor that the specified speed limit is not exceeded.
  • the power supply to the motor is stopped by turning off the gate drive signal of the power conversion device to improve safety. Secure.
  • Patent Document 1 discloses a technique in which a current value, which is a value of a current supplied to a motor, is detected by a current sensor, and the speed of the motor is monitored based on the current value.
  • Patent Document 1 only describes that the speed of the motor is monitored based on the current value detected by the current sensor, and no specific processing is proposed.
  • the present invention has been made in view of the above, and an object of the present invention is to obtain a power conversion device capable of performing safe speed monitoring with a simple configuration using a current sensor.
  • the power conversion device of the present invention controls the main circuit unit and the main circuit unit that convert DC power into AC power and supply the converted AC power to the motor. It includes a control unit for detecting a current supplied from the main circuit unit to the motor, and a half-wave rectifying unit for half-wave rectifying the current detection signal output from the current sensor.
  • the control unit includes a current frequency calculation unit that calculates the current frequency, which is the frequency of the current, and a current frequency based on at least one of the rise timing and the fall timing of the current detection signal that has been half-wave rectified by the half-wave rectifier unit. It includes a monitoring unit that monitors the speed of the motor based on the current frequency calculated by the calculation unit.
  • the power conversion device has an effect that safe speed monitoring can be performed with a simple configuration using a current sensor.
  • the figure which shows the relationship between the current detection signal output from the current sensor which concerns on Embodiment 1, the current detection signal which is half-wave rectified by a half-wave rectifier, and the current code signal A flowchart showing an example of processing of the drive control unit of the control unit according to the first embodiment.
  • FIG. 1 is a diagram showing a configuration example of a drive control system including a power conversion device according to a first embodiment of the present invention.
  • the drive control system 100 according to the first embodiment includes a power conversion device 1, a motor 2, an AC power supply 3, and a safety device 4.
  • the power conversion device 1 operates by the AC power supplied from the AC power supply 3 and controls and drives the motor 2.
  • the power conversion device 1 converts the three-phase AC power supplied from the AC power supply 3 into AC power having a frequency corresponding to a command signal input from the outside, and supplies the AC power to the motor 2.
  • the motor 2 is a three-phase AC motor
  • the power conversion device 1 converts the three-phase AC power supplied from the AC power supply 3 into a three-phase AC power having a frequency corresponding to a command signal, and the three-phase AC is applied. Power can be supplied to the motor 2.
  • the AC power supply 3 may be a single-phase power supply.
  • the safety device 4 outputs a safety signal for putting the motor 2 in a safe state in the drive control system 100 to the power conversion device 1.
  • Types of safety signals include, for example, a signal requesting safe torque off (STO: Safe Torque Off), a signal requesting safe stop 1 (SS1: Safe Stop 1), and a signal requesting safe speed monitoring (SLS). Is included.
  • STO Safe Torque Off
  • SS1 Safe Stop 1
  • SLS signal requesting safe speed monitoring
  • the STO signal is a signal that requests the power conversion device 1 to stop the power supply from the power conversion device 1 that drives the motor 2 to the motor 2.
  • the SS1 signal is a signal that requests the power conversion device 1 to stop the power supply to the motor 2 by safety torque off after a lapse of a designated time after starting the deceleration of the motor 2.
  • the SLS signal monitors that the speed of the motor 2 does not exceed the specified speed limit value, and when the speed of the motor 2 exceeds the specified speed limit value, powers to stop the power supply to the motor 2 by safety torque off. This is a signal required for the conversion device 1.
  • the STO signal, SS1 signal, and SLS signal are, for example, signals that require the performance of safety functions specified in the international standard IEC61508-5-1.
  • the safety device 4 outputs a safety signal to the power conversion device 1 when, for example, an operator's approach to the motor 2 is detected or an emergency stop button is operated.
  • the safety device 4 is, for example, a safety PLC (Programmable Logic Controller) or a safety relay.
  • a safety PLC Programmable Logic Controller
  • a safety relay When the safety device 4 is connected to a plurality of devices such as a detection device for detecting the approach of an operator to the motor 2 and an emergency stop button, and receives an emergency notification from any of these devices. , Output a safety signal.
  • the power conversion device 1 includes a main circuit unit 11, a control unit 12, a gate drive unit 13, a current sensor 14, and a zero-cross detection unit 15.
  • the main circuit unit 11 supplies AC power for driving the motor 2 to the motor 2 based on the three-phase AC power supplied from the AC power supply 3.
  • the main circuit unit 11 includes an AC / DC converter 20 and a DC / AC converter 21.
  • the AC / DC converter 20 converts the AC power supplied from the AC power supply 3 into DC power.
  • the AC / DC converter 20 has a three-phase diode bridge 22 composed of a plurality of diodes connected by a three-phase bridge, and a smoothing capacitor 23 for smoothing an AC voltage rectified by the three-phase diode bridge 22.
  • the AC / DC converter 20 may have a configuration having a plurality of switching elements connected by a three-phase bridge instead of the three-phase diode bridge 22.
  • the DC / AC converter 21 converts the DC power supplied from the AC / DC converter 20 into AC power having a frequency corresponding to the command signal, and outputs the converted AC power to the motor 2.
  • the DC / AC converter 21 has a plurality of switching elements 31, 32, 33, 34, 35, 36 connected by a three-phase bridge.
  • the switching elements 31, 32, 33, 34, 35, 36 are semiconductor switching elements such as MOSFETs (Metal Oxide Semiconductor Field Effect Transistors) or IGBTs (Insulated Gate Bipolar Transistors), for example.
  • the control unit 12 includes a drive control unit 40 that generates a control signal for driving the motor 2 and monitors an abnormality or the like, and a safety function unit 50 that monitors the abnormality or the like. As will be described later, the drive control unit 40 and the safety function unit 50 make the processing for the safety signal redundant by duplication.
  • the drive control unit 40 generates a control signal based on a command signal input from the outside, and outputs the generated control signal to the gate drive unit 13.
  • a command signal is, for example, a signal indicating a speed command that specifies the speed of the motor 2.
  • the drive control unit 40 When the command signal is a speed command, the drive control unit 40 generates a control signal for setting the speed of the motor 2 to a speed corresponding to the speed command, and outputs the generated control signal to the gate drive unit 13.
  • the drive control unit 40 generates a control signal based on the safety signal output from the safety device 4, and outputs the generated control signal to the gate drive unit 13. For example, when the safety signal output from the safety device 4 is an SLS signal, the drive control unit 40 controls the motor 2 so that the speed of the motor 2 does not exceed the specified speed limit value, and the zero cross detection unit 15 Based on the output current code signal I sig1 , it is monitored that the speed of the motor 2 does not exceed the specified speed limit value. Then, when the speed of the motor 2 exceeds the specified speed limit value, the drive control unit 40 outputs a control signal for turning off the switching elements 31, 32, 33, 34, 35, 36 to the gate drive unit 13.
  • the safety function unit 50 controls the drive control unit 40 based on the safety signal output from the safety device 4. For example, when the safety signal output from the safety device 4 is an SLS signal, the safety function unit 50 sets the speed of the motor 2 to a specified speed limit value based on the current code signal I sig2 output from the zero cross detection unit 15. Monitor not to exceed. Then, when the speed of the motor 2 exceeds the specified speed limit value, the safety function unit 50 causes the drive control unit 40 to execute the safety torque off function.
  • the gate drive unit 13 generates a plurality of PWM (Pulse Width Modulation) signals for driving the switching elements 31, 32, 33, 34, 35, 36 based on the control signal output from the drive control unit 40. ..
  • the gate drive unit 13 outputs each generated PWM signal to the corresponding switching element among the switching elements 31, 32, 33, 34, 35, and 36. Since such a PWM signal drives the gates of the switching elements 31, 32, 33, 34, 35, 36, it is also called a gate drive signal.
  • Current sensor 14 detects the alternating current supplied from the main circuit unit 11 to the motor 2, and outputs a current detection signal I det showing an analog waveform of the alternating current supplied from the main circuit unit 11 to the motor 2.
  • Such current sensor 14 when the motor 2 is a three-phase AC motor, and outputs a current detection signal I det showing an analog waveform of the alternating current supplied to one phase of the three phases.
  • the current sensor 14 is a Hall element type current sensor including, for example, a magnetic core, a Hall element, an operational amplifier, and the like.
  • the current sensor 14 converts the magnetic field generated around the conductor wire that supplies the drive current from the main circuit unit 11 to the motor 2 into a voltage by using the Hall effect, and outputs the converted voltage as a current detection signal ID. To do.
  • the current sensor 14 may be, for example, a CT (Current Transformer) type current sensor including a magnetic core, a secondary winding, a resistor, and the like. Further, the current sensor 14 may have a configuration including a shunt resistor connected in series between the main circuit unit 11 and the motor 2.
  • Zero-cross detecting unit 15 based on the current detection signal I det output from the current sensor 14 generates a current code signal I sig1, I sig2. Then, the zero cross detection unit 15 outputs the current code signal I sig1 to the drive control unit 40, and outputs the current code signal I sig2 to the safety function unit 50.
  • the current code signals I sig1 and I sig2 are a time-series sample sequence containing code information indicating the positive / negative of the drive current obtained by sampling the waveform of the drive current supplied from the main circuit unit 11 to the motor 2. It is a signal.
  • FIG. 2 is a diagram showing a configuration example of a control unit, a gate drive unit, and a zero cross detection unit in the power conversion device according to the first embodiment.
  • the zero cross detection unit 15 includes current code signal generation units 61 and 62.
  • the current code signal generation unit 61 generates the current code signal I sig1 based on the current detection signal I det output from the current sensor 14.
  • the current code signal generation unit 62 generates the current code signal I sig2 based on the current detection signal I det output from the current sensor 14.
  • the current code signal generation unit 61 and the current code signal generation unit 62 have the same configuration as each other.
  • FIG. 3 is a diagram showing a configuration example of the current code signal generation unit according to the first embodiment.
  • the current code signal generation unit 61 includes a half-wave rectifier unit 80, an operational amplifier 81, a filter 82, and a hysteresis comparator 83.
  • the half-wave rectifier unit 80 half-wave rectifies the current detection signal I det output from the current sensor 14, and outputs the current detection signal I detr , which is the current detection signal I det after the half-wave rectification.
  • the half-wave rectifier unit 80 is composed of, for example, a diode.
  • the operational amplifier 81 amplifies the current detection signal I detr output from the half-wave rectifier unit 80 and outputs it.
  • the filter 82 removes noise from the current detection signal I detr voltage-amplified by the operational amplifier 81.
  • the filter 82 is, for example, an RC low-pass filter.
  • the filter 82 may be a bandpass filter.
  • the hysteresis comparator 83 detects the rising timing and the falling timing of the current detection signal I detr output from the filter 82, and outputs the current code signal I sig1 which is a signal indicating the detection result.
  • the operational amplifier 81, the filter 82, and the hysteresis comparator 83 process the current detection signal I detr, which is a half-wave rectified waveform. Therefore, the operational amplifier 81, the filter 82, and the hysteresis comparator 83 do not require a negative electrode power source and can be driven by a single power source. Therefore, the current code signal generation unit 61 can have a simple configuration.
  • the hysteresis comparator 83 includes a comparator 91 and resistors 92, 93, 94, 95, 96.
  • the hysteresis comparator 83 raises the current code signal I sig1 to a higher level when the current detection signal I der becomes the sign inversion threshold Th1 or more, and the current code when the current detection signal I der becomes the sign inversion threshold Th2 or less. Set the signal I sig1 to a lower level. Th1> Th2.
  • FIG. 4 is a diagram showing the relationship between the current detection signal output from the current sensor according to the first embodiment, the current detection signal half-wave rectified by the half-wave rectifier unit, and the current code signal.
  • the current detection signal I det is half-wave rectified by the half-wave rectifier unit 80, and the half-wave rectified current detection signal I detr is output to the hysteresis comparator 83.
  • the hysteresis comparator 83 detects the rising timing and the falling timing of the current detection signal I detr output from the half-wave rectifier unit 80. For example, the hysteresis comparator 83 detects the rising timing of the current detection signal I der at the timing when the current detection signal I der becomes the sign inversion threshold Th1 or more, and changes the current code signal I sig1 from the low level to the high level. Further, the hysteresis comparator 83 detects the falling timing of the current detection signal I der at the timing when the current detection signal I der becomes the sign inversion threshold Th2 or less, and changes the current code signal I sig1 from the high level to the low level. ..
  • the hysteresis comparator 83 does not detect a ripple of a drive current smaller than the difference between the code inversion threshold Th1 and the code inversion threshold Th2, and has high noise resistance. Therefore, in the current code signal generation unit 61, the filter 82 can have a simple configuration.
  • the current code signal generation units 61 and 62 are not limited to the configuration shown in FIG.
  • the current code signal generator 61 and 62 if the current detection signal I det may not be voltage amplified, may be a structure without the operational amplifier 81.
  • the hysteresis comparator 83 is not limited to the configuration shown in FIG.
  • the hysteresis comparator 83 sets the current code signal I sig1 to a lower level when the current detection signal I der becomes the code inversion threshold Th1 or more, and the current when the current detection signal I der becomes the code inversion threshold Th2 or less.
  • the code signal I sig1 may be set to a high level.
  • the relationship between the code reversal threshold Th1 and the code reversal threshold Th2 may be Th1 ⁇ Th2.
  • the hysteresis comparator 83 may be a digital circuit instead of the analog circuit.
  • control unit 12 includes a drive control unit 40 and a safety function unit 50.
  • the drive control unit 40 includes a control signal generation unit 41, a current frequency calculation unit 42, and a monitoring unit 43.
  • the control signal generation unit 41 generates a control signal based on a command signal input from the outside or a safety signal input from the safety device 4.
  • the power conversion device 1 is provided with a current sensor (not shown) that is different from the current sensor 14 and detects a three-phase current supplied to the motor 2.
  • the control signal generation unit 41 has a speed control unit (not shown) that controls the speed based on the three-phase current detected by the current sensor, and a speed control unit (not shown) that controls the current based on the three-phase current detected by the current sensor. It is equipped with a current control unit.
  • the speed control unit estimates the speed of the motor 2 based on, for example, the three-phase current detected by the current sensor, and generates a current command so that the estimated speed of the motor 2 matches the speed command. be able to. Further, the current control unit (not shown) can generate a control signal so that the q-axis current of the dq coordinate system obtained from the three-phase current detected by the current sensor and the current command match.
  • the current frequency calculation unit 42 calculates the current frequency ⁇ c1 , which is the frequency of the current supplied from the main circuit unit 11 to the motor 2, based on the current code signal I sig1 output from the zero cross detection unit 15. Specifically, the current frequency calculation unit 42 has a pulse counter function, and counts both rising and falling edges of the current code signal I sig1 . The current frequency calculation unit 42 samples the count value at a preset cycle, and calculates the current frequency ⁇ c1 from the sampled count value.
  • the current frequency calculator 42 based on the result of counting both rise and fall of the current sign signal I sig1, Instead of calculating the current frequency omega c1, rising or falling of the current sign signal I sig1
  • the current frequency ⁇ c1 may be calculated based on the result of counting only.
  • the monitoring unit 43 monitors the speed of the motor 2 based on the current frequency ⁇ c1 calculated by the current frequency calculation unit 42, and determines, for example, whether or not to execute the safety torque off based on the monitoring result. Specifically, when the monitoring unit 43 determines that the control unit 12 is not controlling the motor 2 in response to the safety signal based on the current frequency ⁇ c1 calculated by the current frequency calculation unit 42.
  • the control signal generation unit 41 is made to execute the safety torque off.
  • the monitoring unit 43 includes a current frequency self-diagnosis unit 44, a current frequency mutual diagnosis unit 45, and an output frequency self-diagnosis unit 46.
  • the current frequency self-diagnosis unit 44 sets the speed of the motor 2 as a value directly proportional to the current frequency ⁇ c1 or the current frequency ⁇ c1 calculated by the current frequency calculation unit 42, and the speed of the motor 2 is a preset predetermined speed limit value. It is determined whether or not it is ⁇ th or less.
  • the control signal generation unit 41 causes the control signal generation unit 41 to execute the safety torque off.
  • the control signal is output to the gate drive unit 13.
  • the current frequency ⁇ c1 is a value directly proportional to the speed of the motor 2 per the number of poles of the stator in the motor 2, and can be treated as an estimated value of the speed of the motor 2.
  • the value directly proportional to the current frequency ⁇ c1 is, for example, a value obtained by multiplying the current frequency ⁇ c1 by 2 by the number of poles of the stator in the motor 2, and is used as an estimated value of the speed [rps] of the motor 2.
  • the specified speed limit omega th is the speed of the motor 2 [rps] The corresponding upper limit.
  • the gate drive unit 13 has a PWM signal generation unit 71 that generates a PWM signal to be output to the switching elements 31, 32, 33, 34, 35, 36 based on the control signal output from the control signal generation unit 41. ing.
  • the PWM signal generation unit 71 turns off the PWM signals to the switching elements 31, 32, 33, 34, 35, 36. .. As a result, the power supply from the main circuit unit 11 to the motor 2 is stopped.
  • the display 16 can display an alarm.
  • the display 16 is a display such as an LCD (Liquid Crystal Display) or an alarm lamp.
  • the current frequency self-diagnosis unit 44 displays character information indicating that the value directly proportional to the current frequency ⁇ c1 or the current frequency ⁇ c1 is not equal to or less than the specified speed limit value ⁇ th . It can be displayed at 16.
  • the current frequency self-diagnosis unit 44 may display on the display 16 the information of the graph showing the temporal deviation of the value directly proportional to the current frequency ⁇ c1 or the current frequency ⁇ c1 and the specified speed limit value ⁇ th. it can.
  • the speaker (not shown) may output an alarm sound. it can.
  • the control signal generation unit 41 causes the control signal generation unit 41 to execute the safety torque off. It is also possible to output a control signal for reducing the power supply to the motor 2 to the gate drive unit 13 instead of the control signal for the purpose. As a result, the electric power supplied to the motor 2 can be reduced.
  • the current frequency mutual diagnosis unit 45 performs mutual judgment processing based on the current frequency ⁇ c1 calculated by the current frequency calculation unit 42 and the current frequency ⁇ c2 calculated by the safety function unit 50, which will be described later. Specifically, the current frequency mutual diagnosis unit 45 determines whether or not the difference between the current frequency ⁇ c1 and the current frequency ⁇ c2 is within the preset predetermined range R th1 . When the current frequency mutual diagnosis unit 45 determines that the difference between the current frequency ⁇ c1 and the current frequency ⁇ c2 is outside the specified range R th1 , the control signal generation unit 41 transmits a control signal for executing the safety torque off. Output to the gate drive unit 13. As a result, the power supply to the motor 2 is stopped.
  • the output frequency self-diagnosis unit 46 is within a predetermined range R th2 in which the difference between the current frequency ⁇ c1 calculated by the current frequency calculation unit 42 and the output frequency ⁇ out calculated by the gate drive unit 13 is set in advance. Judge whether or not.
  • the gate drive unit 13 has an output frequency calculation unit 72 that calculates the output frequency ⁇ out , and the output frequency self-diagnosis unit 46 outputs information on the output frequency ⁇ out calculated by the output frequency calculation unit 72. Obtained from the calculation unit 72.
  • the output frequency ⁇ out is the frequency of the drive voltage output from the DC / AC converter 21 of the main circuit unit 11 to the motor 2 by controlling the gate drive signals of the switching elements 31, 32, 33, 34, 35, 36.
  • the output frequency calculation unit 72 calculates the output frequency ⁇ out based on the control signal generated by the control signal generation unit 41. For example, when the control signal includes a voltage command having three-phase coordinates, the frequency of the voltage command can be calculated as the output frequency ⁇ out .
  • the output frequency self-diagnosis unit 46 determines that the difference between the current frequency ⁇ c1 and the output frequency ⁇ out is outside the specified range R th2, the output frequency self-diagnosis unit 46 causes the control signal generation unit 41 to transmit a control signal for executing the safety torque off. Output to the gate drive unit 13. As a result, the power supply to the motor 2 is stopped.
  • the current frequency mutual diagnosis unit 45 and the output frequency self-diagnosis unit 46 display an alarm on the display 16 when the control signal generation unit 41 executes the safety torque off. , It is possible to output an alarm sound to a speaker (not shown). Further, the current frequency mutual diagnosis unit 45 and the output frequency self-diagnosis unit 46, like the current frequency self-diagnosis unit 44, send the control signal generation unit 41 to the motor 2 instead of the control signal for executing the safety torque off. It is also possible to output a control signal for reducing the power supply of the gate drive unit 13.
  • the safety function unit 50 includes a current frequency calculation unit 51 and a monitoring unit 52.
  • the current frequency calculation unit 51 calculates the current frequency ⁇ c2 , which is the frequency of the current supplied from the main circuit unit 11 to the motor 2, based on the current code signal I sig2 output from the zero cross detection unit 15. Similar to the current frequency calculation unit 42, the current frequency calculation unit 51 has a pulse counter function and counts both rising and falling edges of the current code signal I sig2 .
  • the current frequency calculation unit 51 samples the count value at a preset cycle, and calculates the current frequency ⁇ c2 as the speed of the motor 2 from the sampled count value.
  • the current frequency calculator 51 based on the result of counting both rise and fall of the current sign signal I sig2, Instead of calculating the current frequency omega c2, rising or falling of the current sign signal I sig2
  • the current frequency ⁇ c2 may be calculated based on the result of counting only.
  • the monitoring unit 52 determines whether or not the safety torque off can be executed based on the current frequency ⁇ c2 calculated by the current frequency calculation unit 51. Specifically, when the monitoring unit 52 determines that the control unit 12 is not controlling the motor 2 in response to the safety signal based on the current frequency ⁇ c2 detected by the current frequency calculation unit 51.
  • the control signal generation unit 41 is made to execute the safety torque off.
  • the monitoring unit 52 includes a current frequency self-diagnosis unit 53, a current frequency mutual diagnosis unit 54, and an output frequency self-diagnosis unit 55.
  • the current frequency self-diagnosis unit 53 sets the speed of the motor 2 as a value directly proportional to the current frequency ⁇ c2 or the current frequency ⁇ c2 calculated by the current frequency calculation unit 51, and the speed of the motor 2 is a preset predetermined speed limit value. It is determined whether or not it is ⁇ th or less.
  • the control signal generation unit 41 causes the control signal generation unit 41 to execute the safety torque off.
  • the control signal is output to the gate drive unit 13. As a result, the power supply to the motor 2 is stopped.
  • the current frequency self-diagnosis unit 53 determines that the value directly proportional to the current frequency ⁇ c2 or the current frequency ⁇ c2 is not equal to or less than the specified speed limit value ⁇ th . It is possible to display an alarm on 16 or to output an alarm sound to a speaker (not shown).
  • the control signal It is also possible to have the generation unit 41 output a control signal for reducing the power supply to the motor 2 to the gate drive unit 13 instead of the control signal for executing the safe torque off.
  • the current frequency ⁇ c2 is a value directly proportional to the speed of the motor 2 per the number of poles of the stator in the motor 2, and can be treated as an estimated value of the speed of the motor 2 in the same manner as the current frequency ⁇ c1 .
  • omega th specified speed limit omega th is per number of poles of the stator in the motor 2 of the motor 2 This is the limit value corresponding to the speed.
  • the value directly proportional to the current frequency ⁇ c2 is, for example, a value obtained by multiplying the current frequency ⁇ c2 by 2 by the number of poles of the stator in the motor 2, and is used as an estimated value of the speed [rps] of the motor 2. Can be handled. If whether or not the value that is directly proportional to the current frequency omega c2 at a current frequency self-diagnosis unit 53 is equal to or less than the prescribed speed limit value omega th is determined, the specified speed limit omega th is the speed of the motor 2 [rps] The corresponding upper limit.
  • the current frequency mutual diagnosis unit 54 performs mutual determination processing based on the current frequencies ⁇ c1 and ⁇ c2 . Specifically, the current frequency mutual diagnosis unit 54 determines whether or not the difference between the current frequency ⁇ c1 and the current frequency ⁇ c2 is within the preset predetermined range R th1 . When the current frequency mutual diagnosis unit 54 determines that the difference between the current frequency ⁇ c1 and the current frequency ⁇ c2 is outside the specified range R th1 , the control signal generation unit 41 transmits a control signal for executing the safety torque off. Output to the gate drive unit 13. As a result, the power supply to the motor 2 is stopped.
  • the output frequency self-diagnosis unit 55 determines whether or not the difference between the current frequency ⁇ c2 and the output frequency ⁇ out is within the preset predetermined range R th2 .
  • the output frequency self-diagnosis unit 55 gate-drives the control signal generation unit 41 to execute a safety torque off. Output to unit 13. As a result, the power supply to the motor 2 is stopped.
  • the current frequency mutual diagnosis unit 54 and the output frequency self-diagnosis unit 55 display an alarm on the display 16 when the control signal generation unit 41 executes the safety torque off. , It is possible to output an alarm sound to a speaker (not shown). Further, the current frequency mutual diagnosis unit 54 and the output frequency self-diagnosis unit 55, like the current frequency self-diagnosis unit 53, send the control signal generation unit 41 to the motor 2 instead of the control signal for executing the safety torque off. It is also possible to output a control signal for reducing the power supply of the gate drive unit 13.
  • FIG. 5 is a flowchart showing an example of processing of the drive control unit of the control unit according to the first embodiment.
  • the drive control unit 40 determines whether or not the SLS signal has been received from the safety device 4 (step S10).
  • the drive control unit 40 calculates the current frequency ⁇ c1 (step S11).
  • the drive control unit 40 determines whether or not the current frequency ⁇ c1 is equal to or less than the specified speed limit value ⁇ th (step S12).
  • the drive control unit 40 determines that the current frequency ⁇ c1 is equal to or less than the specified speed limit value ⁇ th (step S12: Yes)
  • the difference between the current frequency ⁇ c1 and the current frequency ⁇ c2 is outside the specified range R th1 . It is determined whether or not there is (step S13).
  • step S13 When the drive control unit 40 determines that the difference between the current frequency ⁇ c1 and the current frequency ⁇ c2 is not outside the specified range R th1 (step S13: No), the difference between the current frequency ⁇ c1 and the output frequency ⁇ out is It is determined whether or not the frequency is outside the specified range R th2 (step S14). When the drive control unit 40 determines that the current frequency ⁇ c1 is not equal to or less than the specified speed limit value ⁇ th (step S12: No), the difference between the current frequency ⁇ c1 and the current frequency ⁇ c2 is outside the specified range R th1 .
  • step S13 If it is determined that there is (step S13: Yes), or if it is determined that the difference between the current frequency ⁇ c1 and the output frequency ⁇ out is outside the specified range R th2 (step S14: Yes), it is determined to execute the safe torque off. Then, the control unit 12 is made to execute the safety torque off (step S15).
  • step S15 when the drive control unit 40 determines that the SLS signal is not received (step S10: No), or when the difference between the current frequency ⁇ c1 and the output frequency ⁇ out is within the specified range R.
  • step S14: No the process shown in FIG. 5 is terminated.
  • the processing of the safety function unit 50 of the control unit 12 is the same as the processing of the drive control unit 40 shown in FIG. 5, and in steps S11, S12, and S14 shown in FIG. 5, the current frequency is replaced with the current frequency ⁇ c1. It differs from the processing of the drive control unit 40 shown in FIG. 5 in that ⁇ c2 is used.
  • FIG. 6 is a diagram showing an example of the hardware configuration of the gate drive unit, the zero cross detection unit, the drive control unit, and the safety function unit according to the first embodiment.
  • each of the gate drive unit 13, the zero cross detection unit 15, the drive control unit 40, and the safety function unit 50 includes a computer including a processor 101, a memory 102, and an interface circuit 103.
  • the processor 101, the memory 102, and the interface circuit 103 can send and receive data to and from each other by the bus 104.
  • a part of the PWM signal generation unit 71 of the gate drive unit 13 is realized by the interface circuit 103.
  • the processor 101 in the gate drive unit 13 executes the functions of the PWM signal generation unit 71 and the output frequency calculation unit 72 by reading and executing the program stored in the memory 102.
  • the processor 101 in the zero-cross detection unit 15 executes the functions of the current code signal generation units 61 and 62 by reading and executing the program stored in the memory 102.
  • the processor 101 in the drive control unit 40 executes the functions of the control signal generation unit 41, the current frequency calculation unit 42, and the monitoring unit 43 by reading and executing the program stored in the memory 102.
  • the processor 101 in the safety function unit 50 executes the functions of the current frequency calculation unit 51 and the monitoring unit 52 by reading and executing the program stored in the memory 102.
  • the pulse counter function of the processor 101 executes counting of both rising and falling edges of the current code signals I sig1 and I sig2 in the current frequency calculation units 42 and 51 described above.
  • the current frequency calculation units 42 and 51 may be configured such that the processor 101 counts the number of inversions of the current code signals I sig1 and I sig2 by using the input port of the interface circuit 103.
  • the processor 101 is an example of a processing circuit, and includes one or more of a CPU (Central Processing Unit), a DSP (Digital Signal Processor), and a system LSI (Large Scale Integration).
  • the memory 102 is one or more of RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EPROM (Erasable Programmable Read Only Memory), and EEPROM (registered trademark) (Electrically Erasable Programmable Read Only Memory). Including.
  • the memory 102 also includes a recording medium on which a computer-readable program is recorded. Such recording media include one or more of non-volatile or volatile semiconductor memories, magnetic disks, flexible memories, optical disks, compact disks, and DVDs (Digital Versatile Discs).
  • the control unit 12 may include integrated circuits such as an ASIC (Application Specific Integrated Circuit) and an FPGA (Field Programmable Gate Array).
  • the drive control unit 40 and the safety function unit 50 include the processor 101 and the program operating on the processor 101, respectively, and the drive control unit 40 and the safety function unit 50 function independently of each other.
  • the power conversion device 1 includes a main circuit unit 11, a control unit 12, a current sensor 14, and a half-wave rectifier unit 80.
  • the main circuit unit 11 converts DC power into AC power and supplies the converted AC power to the motor 2.
  • the control unit 12 controls the main circuit unit 11.
  • the current sensor 14 detects the current supplied from the main circuit unit 11 to the motor 2.
  • the control unit 12 includes current frequency calculation units 42 and 51 and monitoring units 43 and 52.
  • the current frequency calculation units 42 and 51 use the current frequency ⁇ based on at least one of the rising timing and the falling timing of the current detection signal I detr , which is the current detection signal I det rectified by the half wave rectifying unit 80. Detect c1 and ⁇ c2 .
  • the monitoring units 43 and 52 monitor the speed of the motor 2 based on the current frequencies ⁇ c1 and ⁇ c2 calculated by the current frequency calculation units 42 and 51.
  • the power conversion device 1 can perform safe speed monitoring without using an external detector such as an encoder, and the power conversion device 1 processes the current detection signal I der which is a half-wave rectified waveform. Therefore, a negative power source is not required, and safe speed monitoring can be performed with a simple configuration.
  • the power conversion device 1 includes a hysteresis comparator 83 that compares the rising timing and the falling timing of the current detection signal I detr half-wave rectified by the half-wave rectifying unit 80 with different threshold values .
  • the current frequency calculation units 42 and 51 calculate the current frequencies ⁇ c1 and ⁇ c2 based on the rise timing obtained from the comparison result by the hysteresis comparator 83.
  • the power conversion device 1 does not detect a ripple of a drive current smaller than the difference between the code inversion threshold Th1 and the code inversion threshold Th2 described above, so that noise resistance can be improved. Therefore, for example, in the current code signal generation units 61 and 62, the filter 82 can have a simple configuration.
  • the monitoring units 43 and 52 may be used.
  • the supply of AC power from the main circuit unit 11 to the motor 2 can be stopped.
  • the power conversion device 1 can stop the motor 2 when the speed of the motor 2 exceeds the specified speed limit value.
  • the monitoring units 43 and 52 are main circuit units when the difference between the current frequencies ⁇ c1 and ⁇ c2 calculated by the plurality of current frequency calculation units 42 and 51 is outside the preset predetermined range R th1.
  • the power supply from 11 to the motor 2 is stopped.
  • the power conversion device 1 can perform mutual diagnosis between the redundant monitoring units 43 and 52, and accurately confirm that the control unit 12 does not control the motor 2 in response to the safety signal. Can be detected.
  • the power conversion device 1 has a PWM signal generation unit 71 that generates a PWM signal that PWM-controls the main circuit unit 11, and an output frequency ⁇ out that is a frequency of an AC voltage output from the main circuit unit 11 to the motor 2. It includes an output frequency calculation unit 72 for calculation.
  • the monitoring units 43 and 52 have a predetermined range R in which the difference between the current frequencies ⁇ c1 and ⁇ c2 calculated by the current frequency calculation units 42 and 51 and the output frequency ⁇ out calculated by the output frequency calculation unit 72 is preset. When it is outside th2 , the power supply from the main circuit unit 11 to the motor 2 is stopped. As a result, the power conversion device 1 can accurately detect that the control unit 12 is not controlling the motor 2 in response to the safety signal.
  • Embodiment 2 The power conversion device according to the second embodiment is different from the power conversion device 1 according to the first embodiment in that the current frequency is calculated using the calculation model generated by machine learning.
  • components having the same functions as those in the first embodiment will be designated by the same reference numerals and description thereof will be omitted, and the differences from the drive control system 100 of the first embodiment will be mainly described.
  • FIG. 7 is a diagram showing a configuration example of a drive control system including the power conversion device according to the second embodiment.
  • the drive control system 100A according to the second embodiment includes a power conversion device 1A, a motor 2, an AC power supply 3, a safety device 4, and a measuring device 5.
  • the measuring device 5 is an example of an external measuring device.
  • the power conversion device 1A is different from the power conversion device 1 in that the control unit 12A having the drive control unit 40A and the safety function unit 50A is provided in place of the control unit 12 having the drive control unit 40 and the safety function unit 50.
  • the drive control unit 40A is different from the drive control unit 40 in that the current frequency calculation unit 42A is provided in place of the current frequency calculation unit 42.
  • the current frequency calculation unit 42A calculates the current frequency ⁇ c1 from the current code signal I sig1 using the calculation model generated by machine learning.
  • the safety function unit 50A is different from the safety function unit 50 in that the current frequency calculation unit 51A is provided instead of the current frequency calculation unit 51.
  • the current frequency calculation unit 51A calculates the current frequency ⁇ c2 from the current code signal I sig2 using the calculation model generated by machine learning. Since the current frequency calculation unit 42A and the current frequency calculation unit 51A have the same configuration, the configuration of the current frequency calculation unit 42A will be specifically described below, and the description of the configuration of the current frequency calculation unit 51A will be omitted. ..
  • the measuring device 5 measures the alternating current supplied from the power conversion device 1A to the motor 2 or the speed of the motor 2 at a preset cycle, and outputs a measured value which is data indicating the measurement result to the power conversion device 1A. To do.
  • the measuring device 5 is, for example, a measuring device such as a data logger having a current detection function.
  • the measuring device 5 outputs, for example, current waveform data indicating the waveform of the alternating current supplied from the power conversion device 1A to the motor 2 to the power conversion device 1A as a measured value.
  • the current waveform data is data obtained by directly attaching a probe of the measuring device 5 to the power semiconductor chip and is affected by noise due to measurement. It is data showing no real current waveform.
  • the measuring device 5 may be an encoder attached to the motor 2. In this case, the measuring device 5 detects the speed of the motor 2.
  • the speed of the motor 2 is the mechanical angular velocity of the motor 2, but it may be the electric angular velocity of the motor 2.
  • the measuring device 5 detects, for example, the rotation position of the rotation shaft of the motor 2 and detects the speed of the motor 2 from the change in the detected rotation position.
  • the measuring device 5 outputs speed data indicating the detected speed of the motor 2 as a measured value to the power conversion device 1A.
  • FIG. 8 is a diagram showing a configuration example of the current frequency calculation unit according to the second embodiment.
  • the current frequency calculation unit 42A includes a first acquisition unit 63, a second acquisition unit 64, a learning unit 65, and a frequency calculation unit 66.
  • the first acquisition unit 63 acquires the current code signal I sig1 output from the zero cross detection unit 15 as a state variable.
  • the second acquisition unit 64 acquires the measured value from the measuring device 5 at a preset cycle via the network by wired communication or wireless communication. For example, the second acquisition unit 64 acquires velocity data or current waveform data as measured values from the measuring device 5.
  • the second acquisition unit 64 calculates the current frequency ⁇ based on the acquired measured value.
  • the current frequency ⁇ is the frequency of the alternating current supplied from the power converter 1A to the motor 2.
  • the second acquisition unit 64 calculates the current frequency ⁇ by performing a fast Fourier transform process on the current waveform data.
  • the second acquisition unit 64 calculates the current frequency ⁇ based on the velocity data and the number of poles of the motor 2.
  • the learning unit 65 performs learning processing and calculates according to the data set created based on the combination of the current code signal I sig1 acquired by the first acquisition unit 63 and the current frequency ⁇ calculated by the second acquisition unit 64. Generate model M.
  • the calculation model generated by the learning unit 65 is a calculation model in which the current code signal I sig1 is input and the current frequency ⁇ c1 is output.
  • the learning unit 65 performs learning processing by so-called supervised learning according to, for example, a neural network model, and generates a calculation model M composed of a neural network.
  • supervised learning is to give a large amount of data sets of inputs and results to a learning device, learn the features in those data sets, and generate a calculation model that estimates the results from the inputs by machine learning. It is a method to do.
  • a neural network is composed of an input layer composed of a plurality of neurons, an intermediate layer composed of a plurality of neurons, and an output layer composed of a plurality of neurons.
  • the intermediate layer may be one layer or three or more layers.
  • the mesosphere is also called a hidden layer.
  • FIG. 9 is a diagram showing an example of a three-layer neural network according to the second embodiment.
  • the learning unit 65 when a plurality of inputs are input to the plurality of input layers X1, X2, X3, the input values are multiplied by the weight W1 and the intermediate layer is used. It is input to Y1 and Y2. Further, the weight W2 is further multiplied by the values input to the intermediate layers Y1 and Y2, and the values are output from the output layers Z1, Z2 and Z3. This output result depends on the values of the weights W1 and W2.
  • the weights W1 are the weights w11 to w16
  • the weights W2 are the weights w21 to w26.
  • the value input to the input layer X1 is multiplied by the weight w11 and input to the intermediate layer Y1, and is multiplied by the weight w12 and input to the intermediate layer Y2.
  • the value input to the input layer X2 is multiplied by the weight w13 and input to the intermediate layer Y1, and is multiplied by the weight w14 and input to the intermediate layer Y2.
  • the value input to the input layer X3 is multiplied by the weight w15 and input to the intermediate layer Y1, and is multiplied by the weight w16 and input to the intermediate layer Y2.
  • the value input to the intermediate layer Y1 is multiplied by the weight w21 and input to the output layer Z1, the weight w23 is multiplied and input to the output layer Z2, and the weight w25 is multiplied and input to the output layer Z3.
  • the value input to the intermediate layer Y2 is multiplied by the weight w22 and input to the output layer Z1, the weight w24 is multiplied and input to the output layer Z2, and the weight w26 is multiplied and input to the output layer Z3.
  • the neural network used in the calculation model M learns the frequency detection method by so-called supervised learning according to a data set including a combination of the current code signal I sig1 and the current frequency ⁇ . That is, the neural network used in the calculation model M sets the weights W1 and W2 so that the result of the current code signal I sig1 input to the input layer and output from the output layer approaches the current frequency ⁇ obtained from the measured value.
  • the learning process is performed by adjusting, and the calculation model M is generated.
  • the learning unit 65 can also generate a calculation model M by so-called unsupervised learning.
  • Unsupervised learning is to give a large amount of input data to a machine learning device so that the machine learning device can learn how the input data is distributed without giving the teacher data corresponding to the input data.
  • It is a method to generate a calculation model that compresses, classifies, and shapes input data by machine learning.
  • unsupervised learning features in a dataset can be clustered among similar people. Then, in unsupervised learning, the output can be predicted by using the result of clustering and assigning an output that optimizes it by setting some standard.
  • semi-supervised learning is also what is called semi-supervised learning as an intermediate problem setting between unsupervised learning and supervised learning. In semi-supervised learning, only a part of the input and output data set is used for learning, and the other input-only data is used for learning.
  • a learning algorithm used in the calculation model M instead of the neural network, deep learning, which learns the extraction of the feature amount itself, can be used, and other known methods such as genetic programming, Machine learning may be performed according to functional logic programming, support vector machines, and the like.
  • the learning unit 65 sets the generated calculation model M in the frequency calculation unit 66.
  • the frequency calculation unit 66 causes the calculation model M to calculate the current frequency ⁇ c1 by inputting the current code signal I sig1 into the calculation model M.
  • the hardware configuration of the current frequency calculation unit 42A is the same as the hardware configuration shown in FIG.
  • Each part of the first acquisition unit 63, the second acquisition unit 64, and the frequency calculation unit 66 is realized by the interface circuit 103.
  • the functions of the first acquisition unit 63, the second acquisition unit 64, the learning unit 65, and the frequency calculation unit 66 are executed by the processor 101 reading and executing the program stored in the memory 102.
  • the first acquisition unit 63, the second acquisition unit 64, the learning unit 65, and the frequency calculation unit 66 may be partially or wholly composed of hardware such as an ASIC or FPGA.
  • FIG. 10 is a diagram showing another example of the configuration of the drive control system including the power conversion device according to the second embodiment.
  • the drive control system 100A according to the second embodiment includes a power conversion device 1A, a motor 2, an AC power supply 3, a safety device 4, a measuring device 5, and a machine learning device 6. Be prepared.
  • the current frequency calculation unit 42A of the power conversion device 1A shown in FIG. 10 does not have the first acquisition unit 63, the second acquisition unit 64, and the learning unit 65 shown in FIG. 8, and the current frequency shown in FIG. It is different from the calculation unit 42A.
  • the current frequency calculation unit 51A shown in FIG. 10 has the same configuration as the current frequency calculation unit 42A shown in FIG.
  • FIG. 11 is a diagram showing a configuration example of the machine learning device according to the second embodiment.
  • the machine learning device 6 includes a first acquisition unit 111, a second acquisition unit 112, a learning unit 113, a storage unit 114, and an output unit 115.
  • the machine learning device 6 is communicably connected to the power conversion device 1A via, for example, a network (not shown).
  • the machine learning device 6 may be arranged on the cloud server.
  • the first acquisition unit 111 acquires the current code signals I sig1 and I sig2 from the power conversion device 1A as state variables at a preset cycle via a network by wired communication or wireless communication.
  • the second acquisition unit 112 acquires the measured value from the measuring device 5 by wired communication or wireless communication at a preset cycle via the network.
  • the measured value acquired by the second acquisition unit 112 is the same as the measured value acquired by the second acquisition unit 64. Similar to the second acquisition unit 64, the second acquisition unit 112 calculates the current frequency ⁇ based on the acquired measured value.
  • the learning unit 113 is the same as the learning unit 65 according to the data set created based on the combination of the current code signal I sig1 acquired by the first acquisition unit 111 and the current frequency ⁇ calculated by the second acquisition unit 112. The learning process is performed to generate the calculation model M. Further, the learning unit 113 and the learning unit 65 are in accordance with the data set created based on the combination of the current code signal I sig2 acquired by the first acquisition unit 111 and the current frequency ⁇ calculated by the second acquisition unit 112. The same learning process is performed to generate the calculation model M.
  • the learning unit 113 stores the generated calculation model M in the storage unit 114.
  • the output unit 115 transmits the information of the calculation model M stored in the storage unit 114 to the power conversion device 1A via the network by wired communication or wireless communication.
  • the control unit 12A of the power conversion device 1A sets the information of the calculation model M transmitted from the machine learning device 6 in the current frequency calculation unit 42A and the current frequency calculation unit 51A. For example, the control unit 12A, the current sign signal to set the calculation model M, which is generated using I sig1 to the current frequency calculator 42A, the current sign signal I sig2 current frequency calculator a calculation model M generated using Set to 51A.
  • the hardware configuration of the machine learning device 6 is the same as the hardware configuration shown in FIG.
  • Each part of the first acquisition unit 111, the second acquisition unit 112, and the output unit 115 is realized by the interface circuit 103.
  • the storage unit 114 is realized by the memory 102.
  • the functions of the first acquisition unit 111, the second acquisition unit 112, the learning unit 113, and the output unit 115 are executed by the processor 101 reading and executing the program stored in the memory 102.
  • the first acquisition unit 111, the second acquisition unit 112, the learning unit 113, and the output unit 115 may be partially or wholly composed of hardware such as an ASIC or FPGA.
  • the learning unit 113 can also generate the calculation model M according to the data sets created for the plurality of power conversion devices 1A. Further, the machine learning device 6 can also acquire current code signals I sig1 and I sig2 from a plurality of power conversion devices 1A used at the same site, and a plurality of power conversion devices operating independently at different sites. It is also possible to acquire the current code signals I sig1 and I sig2 from 1A. Further, the machine learning device 6 can add the power conversion device 1A to be acquired of the current code signals I sig1 and I sig2 on the way, or can remove the power conversion device 1A to be acquired from the acquisition target. Further, the machine learning device 6 that generated the calculation model M by machine learning for a certain power conversion device 1A is attached to another power conversion device 1A, and the calculation model M is relearned for the other power conversion device 1A. It can also be updated.
  • the hardware configuration of the drive control unit 40A and the safety function unit 50A is the same as the hardware configuration of the drive control unit 40 and the safety function unit 50.
  • the functions of the drive control unit 40A and the safety function unit 50A are executed by the processor 101 reading and executing the program stored in the memory 102.
  • the drive control unit 40A and the safety function unit 50A may be partially or wholly composed of hardware such as an ASIC or FPGA.
  • the current frequency calculation units 42A and 51A of the power conversion device 1A calculate the current frequencies ⁇ c1 and ⁇ c2 by using the calculation model generated by machine learning. As a result, the current frequencies ⁇ c1 and ⁇ c2 can be calculated accurately.
  • the current frequency calculation units 42A and 51A perform machine learning based on the current code signals I sig1 and I sig2 and the current frequency ⁇ obtained from the waveform of the current measured by the measuring device 5 or the measured value indicating the speed of the motor 2.
  • Each of the current code signals I sig1 and I sig2 is an example of a signal indicating at least one of a rising timing and a falling timing.
  • the current frequency calculation units 42A and 51A input the current code signals I sig1 and I sig2 into the calculation model M to cause the calculation model M to calculate the current frequencies ⁇ c1 and ⁇ c2 .
  • the current sensor 14 is susceptible to noise when the motor 2 operates at a low speed or when the current supplied to the motor 2 is low.
  • the current frequency calculation units 42A and 51A make the calculation model M calculate the current frequencies ⁇ c1 and ⁇ c2 so that the current frequencies ⁇ c1 and ⁇ c2 are accurate even when the current sensor 14 is affected by noise. It can be calculated well.
  • the current frequency calculation units 42A and 51A include a first acquisition unit 63, a second acquisition unit 64, and a learning unit 65.
  • the first acquisition unit 63 acquires the current code signals I sig1 and I sig2 as state variables.
  • the second acquisition unit 64 acquires the measured value from the measuring device 5 and calculates the current frequency ⁇ based on the acquired measured value.
  • the learning unit 65 generates a calculation model M by machine learning based on a data set created by a combination of a state variable acquired by the first acquisition unit 63 and a current frequency ⁇ calculated by the second acquisition unit 64. To do.
  • the power conversion device 1A can generate the calculation model M, so that the current frequencies ⁇ c1 and ⁇ c2 can be calculated accurately even if there are individual differences for each power conversion device 1A. it can.
  • the drive control system 100A includes a machine learning device 6 that generates a calculation model M.
  • the machine learning device 6 includes a first acquisition unit 111, a second acquisition unit 112, and a learning unit 113.
  • the first acquisition unit 111 acquires the current code signals I sig1 and I sig2 as state variables.
  • the second acquisition unit 112 acquires the measured value from the measuring device 5, and calculates the current frequency ⁇ based on the acquired measured value.
  • the learning unit 113 generates a calculation model M by machine learning based on a data set created by a combination of a state variable acquired by the first acquisition unit 111 and a current frequency ⁇ calculated by the second acquisition unit 112. To do.
  • the machine learning device 6 can generate, for example, a calculation model M common to a plurality of power conversion devices 1A, so that the calculation model M is compared with the case where the calculation model M for each power conversion device 1A is generated. Can be easily generated.
  • 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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  • Inverter Devices (AREA)

Abstract

L'invention concerne un dispositif de conversion de puissance qui est pourvu d'une unité de circuit principal, d'une unité de commande (12), d'un capteur de courant et d'un redresseur demi-onde. L'unité de commande (12) comporte des unités de calcul de fréquence de courant (42, 51) et des unités de surveillance (43, 52). Les unités de calcul de fréquence de courant (42, 51) calculent des fréquences de courant (ωc1, ωc2) sur la base de la synchronisation de montée et/ou de la synchronisation de chute d'un signal de détection de courant, qui est le signal de détection de courant qui a été redressé par demi-onde par le redresseur demi-onde. Les unités de surveillance (43, 52) surveillent la vitesse du moteur sur la base des fréquences de courant (ωc1, ωc2) calculées par les unités de calcul de fréquence de courant (42, 51).
PCT/JP2019/045711 2019-03-18 2019-11-21 Dispositif de conversion de puissance, système de commande d'entraînement, dispositif d'apprentissage automatique et procédé de surveillance de moteur WO2020188886A1 (fr)

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JP2020515994A JP6704560B1 (ja) 2019-03-18 2019-11-21 電力変換装置、駆動制御システム、機械学習装置、およびモータ監視方法
CN201980093995.1A CN113574791B (zh) 2019-03-18 2019-11-21 电力转换装置、驱动控制系统、机器学习装置以及电动机监视方法
DE112019006863.6T DE112019006863T5 (de) 2019-03-18 2019-11-21 Leistungswandlungsvorrichtung, Betriebssteuerungssystem, Maschinenlernenvorrichtung und Motorüberwachungsverfahren
US17/429,635 US11362614B2 (en) 2019-03-18 2019-11-21 Power conversion apparatus, drive control system, machine learning apparatus, and motor monitoring method

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US20130249450A1 (en) * 2012-03-20 2013-09-26 Samsung Electronics Co., Ltd. Sensorless control apparatuses and control methods thereof
WO2018070012A1 (fr) * 2016-10-13 2018-04-19 三菱電機株式会社 Appareil de conversion de puissance, dispositif de commande d'entraînement de moteur, soufflante, compresseur et climatiseur
WO2018159274A1 (fr) * 2017-02-28 2018-09-07 株式会社日立産機システム Dispositif de contrôle de moteur électrique à courant alternatif

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