Information processing apparatus, power conversion apparatus, and information processing method

Abstract

To provide a technique capable of achieving appropriate control of a motor.SOLUTION: The control circuit 70 according to an embodiment of the present disclosure acquires the resistance values Ru, Rv, and Rw of the U-phase, the V-phase, and the W-phase of the electric motor 200 as seen from the power conversion device 100 that drives the electric motor 200 on the basis of the voltage values and the current values when a DC voltage is applied between the respective phases of the U-phase and the V-phase, the V-phase and the W-phase, and the W-phase and the U-phase of the electric motor 200, determines whether or not variations in the resistance values exceed the allowable value Rt, and outputs information indicating the determination result.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to an information processing device and the like. [Background technology]

[0002] For example, a technique is known in which the resistance value (primary resistance value) of a stator in an electric motor is measured and the electric motor is controlled based on the measured primary resistance value (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-61492 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when viewed from the perspective of a power conversion device that drives the electric motor, the primary resistance of the electric motor may include the resistance component of the wiring between the electric motor and the stator of the power conversion device. Therefore, for example, if there is a relatively large variation in the resistance component of the wiring of each phase, it may not be possible to appropriately control the electric motor.

[0005] In view of the above, an object of the present invention is to provide a technique that can realize appropriate control of an electric motor. [Means for solving the problem]

[0006] In order to achieve the above object, in one embodiment of the present disclosure, outputting information about the resistance values ​​of the U phase, V phase, and W phase of the electric motor based on voltage values ​​and current values ​​when a DC voltage is applied between the U phase and V phase, the V phase and W phase, and the W phase and U phase of the electric motor; An information processing device is provided.

[0007] In another embodiment of the present disclosure, a main circuit section that converts externally supplied power into a predetermined power and outputs the converted power to drive the electric motor; a processing unit that outputs information about resistance values ​​of the U phase, V phase, and W phase of the electric motor based on voltage values ​​and current values ​​when a DC voltage is applied between the U phase and V phase, the V phase and W phase, and the W phase and U phase of the electric motor, A power converter is provided.

[0008] an information processing device outputs information relating to the resistance values ​​of the U phase, V phase, and W phase of the electric motor based on voltage values ​​and current values ​​when a DC voltage is applied between the U phase and V phase, the V phase and W phase, and the W phase and V phase of the electric motor; A method for processing information is provided. [Effects of the Invention]

[0009] According to the above-described embodiment, it is possible to realize appropriate control of the electric motor. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram illustrating a configuration of an example of a drive system for an electric motor. [Figure 2] FIG. 2 is a diagram showing an example of an equivalent circuit of wiring and an electric motor when a power conversion device outputs DC; [Figure 3] FIG. 2 is a diagram showing an example of an equivalent circuit of wiring and an electric motor when a power conversion device outputs DC; [Figure 4] 4 is a flowchart schematically illustrating an example of a main process of a control circuit. [Figure 5] FIG. 4 is a diagram illustrating an example of a gate signal when the power conversion device outputs DC. [Figure 6] 10 is a flowchart schematically illustrating an example of a sub-process of a control circuit. [Figure 7] 10 is a flowchart schematically illustrating another example of the sub-processing of the control circuit. [Figure 8]FIG. 10 is a diagram showing another example of the equivalent circuit of the wiring and the motor when the power conversion device outputs DC. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment will be described with reference to the drawings.

[0012] [Configuration of electric motor drive system] The configuration of a drive system 1 for an electric motor 200 according to this embodiment will be described with reference to FIG.

[0013] FIG. 1 is a diagram showing an example of the configuration of a drive system 1 for an electric motor 200 according to this embodiment.

[0014] As shown in FIG. 1, the drive system 1 includes a power conversion device 100, a wiring 150, an electric motor 200, a management device 250, and a terminal device 300.

[0015] The drive system 1 uses a power conversion device 100 to drive an electric motor 200.

[0016] The power conversion device 100 drives the electric motor 200 by converting three-phase AC (e.g., AC having R, S, and T phases) input from a commercial power source PS into three-phase AC (e.g., AC having U, V, and W phases) having a predetermined voltage and a predetermined frequency and outputting the converted AC.

[0017] The power conversion device 100 includes a main circuit 100MC, a current sensor 40, a control circuit 70, a display unit 80, and a communication unit 90.

[0018] The main circuit 100MC includes a rectifier circuit 10, a DC link 20, and an inverter circuit 30.

[0019] The rectifier circuit 10 rectifies three-phase AC (that is, AC of R phase, S phase, and T phase) input from the commercial power supply PS, and outputs DC to the DC link 20.

[0020] 1, the rectifier circuit 10 is a full-wave rectifier diode bridge circuit including six rectifier diodes SD, with three sets of two-to-one series-connected rectifier diodes SD constituting upper and lower arms connected in parallel. In this case, the R-phase, S-phase, and T-phase input lines connected to the commercial power supply PS are connected to the midpoints of the three sets of upper and lower arms, respectively.

[0021] The DC link 20 includes a DC line 21 and a smoothing circuit 22 .

[0022] The DC line 21 electrically connects the rectifier circuit 10 and the inverter circuit 30. The DC line 21 includes a positive line 21P on the positive side (i.e., high voltage side) and a negative line 21N on the negative side (i.e., low voltage side).

[0023] One end of the positive line 21P is electrically connected to the positive-side (high-voltage side) output portion of the rectifier circuit 10, and the other end is electrically connected to the positive-side (high-voltage side) input portion of the inverter circuit 30. One end of the negative line 21N is electrically connected to the negative-side (low-voltage side) output portion of the rectifier circuit 10, and the other end is electrically connected to the negative-side (low-voltage side) input portion of the inverter circuit 30.

[0024] The smoothing circuit 22 suppresses and smoothes pulsations in the direct current output from the rectifier circuit 10 and the direct current regenerated from the inverter circuit 30 .

[0025] For example, as shown in FIG. 1, the smoothing circuit 22 includes a smoothing capacitor 22C.

[0026] The smoothing capacitor 22C may be provided in parallel with the rectifier circuit 10 and the inverter circuit 30 so as to electrically connect the positive line 21P and the negative line 21N.

[0027] The smoothing capacitor 22C smoothes the DC power output from the rectifier circuit 10 and the DC regenerated from the inverter circuit 30 while repeatedly charging and discharging as appropriate.

[0028] 1, for example, there is one smoothing capacitor 22C. Alternatively, a plurality of smoothing capacitors 22C may be arranged, and the plurality of smoothing capacitors 22C may be connected in parallel or in series between the positive line 21P and the negative line 21N. Alternatively, the plurality of smoothing capacitors 22C may be configured in such a way that a series connection of two or more smoothing capacitors is connected in parallel between the positive line 21P and the negative line 21N.

[0029] The smoothing circuit 22 may also include a reactor.

[0030] The reactor is provided, for example, on the positive line 21P between the rectifier circuit 10 and the smoothing capacitor 22C.

[0031] The reactor smoothes the direct current output from the rectifier circuit 10 and the direct current regenerated by the inverter circuit 30 while generating a voltage that appropriately prevents changes in the current.

[0032] The inverter circuit 30 has positive and negative inputs connected to the other ends of the positive line 21P and the negative line 21N. The inverter circuit 30 converts the DC power supplied from the smoothing circuit 22 into three-phase AC (i.e., AC of U-phase, V-phase, and W-phase) having a predetermined frequency and a predetermined voltage through the switching operations of the semiconductor switches SW1 to SW6, and outputs the converted power to the electric motor 200. Hereinafter, any one of the semiconductor switches SW1 to SW6 may be referred to as the "semiconductor switch SW" for convenience.

[0033] The semiconductor switch SW is, for example, an IGBT (Insulated Gate Bipolar Transistor), a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor), or a HEMT (High Electron Mobility Transistor). The semiconductor switch SW is, for example, made primarily of silicon (Si). The semiconductor switch SW may also be made primarily of a wide bandgap semiconductor material. Examples of wide bandgap semiconductor materials include silicon carbide (SiC), gallium nitride (gallium nitride: GaN), gallium oxide (gallium oxide: Ga2O3), and carbon (diamond: C).

[0034] For example, as shown in FIG. 1, the inverter circuit 30 may include a bridge circuit in which three sets of series-connected assemblies (switch legs) of two semiconductor switches SW constituting upper and lower arms are connected in parallel between a positive line 21P and a negative line 21N. In this case, the inverter circuit 30 outputs three-phase AC through three output lines drawn from the connection points of the three sets of upper and lower arms. Specifically, a U-phase output line is drawn from the midpoint between the semiconductor switch SW1 of the upper arm and the semiconductor switch SW2 of the lower arm, a V-phase output line is drawn from the midpoint between the semiconductor switch SW3 of the upper arm and the semiconductor switch SW4 of the lower arm, and a W-phase output line is drawn from the midpoint between the semiconductor switch SW5 of the upper arm and the semiconductor switch SW6 of the lower arm. Also, for example, as shown in FIG. 1, a free-wheeling diode is connected in parallel to each of the semiconductor switches SW1 to SW6.

[0035] The current sensor 40 detects the current in the output line of the power conversion device 100, specifically, the current in the output line of the inverter circuit 30. The current sensor 40 detects the current using, for example, a Hall element, a shunt resistor, a magnetoresistive element, a fluxgate, or the like, and acquires the detected current value (digital value) using an AD (Analog-Digital) converter. The current sensor 40 includes current sensors 40U and 40W.

[0036] The current sensor 40U detects the current in the U-phase output line of the power conversion device 100, and outputs the detected value (i.e., the U-phase current value I u The current sensor 40W detects the current in the W-phase output line of the power conversion device 100 and outputs the detected value (i.e., the W-phase current value I w The output signals of the current sensors 40U and 40W are input to the control circuit 70.

[0037] Note that current sensor 40 may be replaced with a current sensor that detects a current in a V-phase output line of power conversion device 100, instead of either current sensor 40U or 40W. Current sensor 40 may further include a current sensor that detects a current in a V-phase output line of power conversion device 100, in addition to current sensors 40U and 40W.

[0038] The control circuit 70 performs control related to the power conversion device 100. For example, the control circuit 70 controls the power conversion device 100 so that the electric motor 200 operates under predetermined operating conditions, and controls the drive of the electric motor 200 by causing the power conversion device 100 to output electric power of a predetermined voltage and a predetermined frequency to the electric motor 200.

[0039] The functions of the control circuit 70 may be realized by any hardware or a combination of any hardware and software. The control circuit 70 is primarily composed of a computer including a central processing unit (CPU), a memory device, an auxiliary storage device, and an interface device. The memory device may be, for example, a static random access memory (SRAM). The auxiliary storage device may be, for example, an electrically erasable programmable read-only memory (EEPROM) or flash memory. The interface device may include, for example, an external interface for connecting to an external recording medium and a communication interface for communicating with other devices. The control circuit 70 can realize various functions by loading programs installed in the auxiliary storage device into the memory device and executing them on the CPU. The control circuit 70 can also retrieve and install programs from a recording medium via the external interface, or retrieve and install programs from other devices via the communication interface.

[0040] The voltage command value calculation unit 701 calculates a voltage command value V of the U phase of the electric motor 200 for operating the electric motor 200 in accordance with predetermined operating conditions. u * , V-phase voltage command value V v * , and the W-phase voltage command value V w * is calculated, and the voltage command value V u * ,V v * ,V w * Output The gate signal generator 702 generates the voltage command value V u * ,V v * ,V w *Based on this, the gate signal generating unit 702 generates drive signals (gate signals) for switching the semiconductor switches SW1 to SW6 of the inverter circuit 30. The gate signals generated by the gate signal generating unit 702 are output to the gate terminals of the semiconductor switches SW1 to SW6, respectively.

[0041] The resistance value calculation unit 703 calculates the resistance values ​​R of the resistance components of the U-phase, V-phase, and W-phase of the electric motor 200 as seen from the power conversion device 100. u ,R v ,R w The details of the resistance value calculation unit 703 will be described later.

[0042] The functions of the control circuit 70 may be distributed among a plurality of control circuits mounted on the power conversion device 100.

[0043] The display unit 80 displays information about the power conversion device 100 to a user (for example, a worker at a factory where production equipment or machinery driven by the electric motor 200 is installed) under the control of the control circuit 70. The display unit 80 includes, for example, a warning light, an electronic bulletin board, a liquid crystal display, an organic EL (Electroluminescence) display, etc.

[0044] The communication unit 90 communicates with an external device of the power conversion device 100 through a predetermined communication line.

[0045] The predetermined communication line may be, for example, a one-to-one communication line. The predetermined communication line may also include, for example, a local area network (LAN) such as a field network established within a facility (factory) where production equipment, machinery, etc. driven by the electric motor 200 are installed. The local network may be wired or wireless, or may include both. The predetermined communication line may also include, for example, a wide area network (WAN) outside the facility (factory) where production equipment, machinery, etc. driven by the electric motor 200 are installed. Wide area networks may include, for example, a mobile communication network terminated at a base station, a satellite communication network using a communication satellite, the Internet, etc. The predetermined communication line may also include, for example, a short-range communication line based on a predetermined wireless communication standard such as Bluetooth (registered trademark) or WiFi.

[0046] The function of the communication unit 90 may be built into the control circuit 70 as one function of the interface device. Also, the communication unit 90 may be omitted, in which case the management device 250 and the terminal device 300 are also omitted, as described below.

[0047] The wiring 150 electrically connects the output portion of the power conversion device 100 and the input portion of the electric motor 200. The wiring 150 includes wirings 150U, 150V, and 150W.

[0048] The wiring 150U electrically connects the U-phase output portion of the power conversion device 100 and the U-phase input portion of the electric motor 200. The wiring 150V electrically connects the V-phase output portion of the power conversion device 100 and the V-phase input portion of the electric motor 200. The wiring 150W connects the W-phase output portion of the power conversion device 100 and the W-phase input portion of the electric motor 200.

[0049] The wiring 150U includes a resistance component 151U and an inductance component 152U. The wiring 150V includes a resistance component 151V and an inductance component 152V. The wiring 150W includes a resistance component 151W and an inductance component 152W.

[0050] The electric motor 200 drives, for example, production equipment or machinery installed in a factory. The electric motor 200 is, for example, an AC motor such as an induction motor or a synchronous motor.

[0051] The electric motor 200 includes a stator 210 and a rotor 220 .

[0052] Stator 210 includes U-phase winding 211U, V-phase winding 211V, and W-phase winding 211W. In this example, windings 211U, 211V, and 211W are electrically connected by a so-called Y connection (also called a "star connection").

[0053] One end of U-phase winding 211U is electrically connected to the other end of wiring 150U through the input section of motor 200, and the other end is electrically connected to neutral point 211NP. One end of V-phase winding 211V is electrically connected to the other end of wiring 150V through the input section of motor 200, and the other end is electrically connected to neutral point 211NP. One end of W-phase winding 211W is electrically connected to the other end of wiring 150W through the input section of motor 200, and the other end is electrically connected to neutral point 211NP.

[0054] U-phase winding 211U includes resistance component 212U and inductance component 213U. W-phase winding 211V includes resistance component 212V and inductance component 213V. W-phase winding 211W includes resistance component 212W and inductance component 213W.

[0055] In the following description, it is assumed that the resistance components 212U, 212V, and 212W have the same resistance value (primary resistance value R1), and any one of the resistance components 212U, 212V, and 212W may be referred to as the "primary resistance."

[0056] The management device 250 is provided outside the power conversion device 100. The management device 250 is a higher-level device of the power conversion device 100, is communicably connected to the power conversion device 100, and performs management related to the power conversion device 100 and the electric motor 200.

[0057] The management device 250, for example, acquires data relating to the states of the power conversion device 100 and the electric motor 200 from the power conversion device 100, and performs processing related to a function for monitoring the states of the power conversion device 100 and the electric motor 200. The management device 250 also performs processing related to an interface function related to interactions between the power conversion device 100 and users, such as workers or managers of a factory where the power conversion device 100 and the electric motor 200 are installed, and the power conversion device 100. Specifically, the management device 250 may perform processing for providing information relating to the electric motor 200 and the power conversion device 100, and for receiving input from the user and transmitting the information to the power conversion device 100.

[0058] The management device 250 is, for example, an edge controller such as a programmable logic controller (PLC) that manages field devices including the power conversion device 100 in a factory or the like where machinery and production equipment driven by the electric motor 200 are installed. The management device 250 is, for example, a terminal device for managing machinery and production equipment in the factory. The management terminal device may be, for example, a stationary computer terminal such as a desktop personal computer (PC) installed in an office of the factory or the like. The management terminal device may also be a portable terminal device (i.e., a mobile terminal) that can be carried by a factory manager, worker, or the like, such as a tablet terminal, smartphone, or laptop PC. The management device 250 is, for example, a server device. The server device may be, for example, an on-premise server or a cloud server installed remotely from the factory or the like where the production equipment and machinery driven by the electric motor 200 are installed. The server device may also be an edge server installed on the premises of the factory or the like where the production equipment and machinery electrically driven by the electric motor 200 are installed, or in a nearby facility.

[0059] The functions of the management device 250 are realized by any hardware or any combination of hardware and software. For example, the management device 250 is primarily configured with a computer including a CPU, a memory device, an auxiliary storage device, a high-speed arithmetic device, and an interface device. The management device 250 may also include user interface devices such as an input device and a display device. The memory device includes, for example, an SRAM or a DRAM (Dynamic Random Access Memory). The auxiliary storage device includes, for example, a hard disk drive (HDD), a solid state drive (SSD), an EEPROM, or a flash memory. The high-speed arithmetic device includes, for example, a graphics processing unit (GPU), an application-specific integrated circuit (ASIC), or a field-programmable gate array (FPGA). The interface device includes, for example, an external interface for connecting to an external recording medium and a communication interface for communicating with other devices. The management device 250 can realize various functions by loading programs installed in the auxiliary storage device into the memory device and executing them on the CPU. The management device 250 can also retrieve and install programs from a recording medium via an external interface, or retrieve and install programs from other devices via a communication interface. Examples of input devices include a keyboard, a mouse, a touch panel, etc. Examples of display devices include a liquid crystal display, an organic EL display, etc.

[0060] The terminal device 300 is a user terminal that is provided outside the power conversion device 100 and is used by a user of the drive system 1. The user of the drive system 1 is, for example, a manager or worker of a factory in which production equipment or machinery driven by the electric motor 200 is installed. The terminal device 300, for example, provides the user with various information related to the states of the power conversion device 100 and the electric motor 200, accepts various inputs from the user, and transmits the inputs to the power conversion device 100. The terminal device 300 may acquire information related to the electric motor 200 and the power conversion device 100 via the management device 250, or may acquire information related to the electric motor 200 and the power conversion device 100 directly from the power conversion device 100. Similarly, the terminal device 300 may transmit various inputs from the user to the power conversion device 100 via the management device 250, or may transmit the inputs from the user directly to the power conversion device 100.

[0061] The terminal device 300 may be, for example, a stationary terminal device such as a desktop PC, or may be, for example, a portable terminal device (mobile terminal) such as a smartphone, a tablet terminal, or a laptop PC.

[0062] The functions of the terminal device 300 are realized by any hardware or a combination of any hardware and software. For example, the terminal device 300 is mainly composed of a computer including a CPU, a memory device, an auxiliary storage device, and an interface device, as well as user interface devices such as an input device and a display device. The memory device includes, for example, SRAM and DRAM. The auxiliary storage device includes, for example, a HDD, an SSD, an EEPROM, and a flash memory. The interface device includes, for example, an external interface for connecting to an external recording medium and a communication interface for communicating with other devices. The terminal device 300 can realize various functions by loading programs installed in the auxiliary storage device into the memory device and executing them on the CPU. The terminal device 300 can also retrieve and install programs from a recording medium via an external interface, or retrieve and install programs from other devices via a communication interface. The input device includes, for example, a button switch, a keyboard, a mouse, a touch panel, etc. The display device includes, for example, a liquid crystal display, an organic electroluminescence (EL) display, etc.

[0063] At least one of the management device 250 and the terminal device 300 may be omitted.

[0064] [Equivalent circuit of wiring and motor when power conversion device is outputting DC] Next, with reference to FIG. 2 and FIG. 3 in addition to FIG. 1, an equivalent circuit of the wiring and the motor when the power converter outputs DC will be described.

[0065] 2 and 3 are diagrams showing an example of an equivalent circuit of the wiring 150 and the electric motor 200 when the power conversion device 100 outputs DC.

[0066] Fig. 3 includes Figs. 3A to 3C. Fig. 3A is an equivalent circuit of the wiring 150 and the electric motor 200 when a DC voltage is applied between the U phase and the V phase of the power conversion device 100 (hereinafter simply referred to as "between U and V"). Fig. 3B is an equivalent circuit of the wiring 150 and the electric motor 200 when a DC voltage is applied between the V phase and the W phase of the power conversion device 100 (hereinafter simply referred to as "between V and W"). Fig. 3C is an equivalent circuit of the wiring 150 and the electric motor 200 when a DC voltage is applied between the W phase and the U phase of the power conversion device 100 (hereinafter simply referred to as "between W and U").

[0067] As shown in FIG. 2, when viewed from the power conversion device 100, the wiring 150 and the electric motor 200 include resistance components 214U, 214V, and 214W in the U phase, V phase, and W phase, respectively, with the neutral point 211NP as the reference.

[0068] Resistance component 214U is a combined resistance component resulting from a series connection of resistance component 151U of wiring 150U and resistance component 212U of winding 211U. Resistance component 214V is a combined resistance component resulting from a series connection of resistance component 151V of wiring 150V and resistance component 212V of winding 211V. Resistance component 214W is a combined resistance component resulting from a series connection of resistance component 151W of wiring 150W and resistance component 212W of winding 211W.

[0069] As shown in FIG. 3A, when a DC voltage is applied across U and V of power conversion device 100, a DC voltage is applied across U-phase resistance component 214U and V-phase resistance component 214V, which are connected in series by neutral point 211NP.

[0070] Furthermore, as shown in FIG. 3B, when a DC voltage is applied between V and W of the power conversion device 100, a DC voltage is applied across both ends of a V-phase resistance component 214V and a W-phase resistance component 214W, which are connected in series by a neutral point 211NP.

[0071] Furthermore, as shown in FIG. 3C, when a DC voltage is applied between W and U of the power conversion device 100, a DC voltage is applied across both ends of the W-phase resistance component 214W and the U-phase resistance component 214U, which are connected in series by the neutral point 211NP.

[0072] [Example of control circuit processing] Next, an example of processing by the control circuit 70 will be described with reference to Figures 4 to 7 in addition to Figures 1 to 3. Specifically, processing for setting the resistance values ​​(primary resistance value R1) of the resistance components 212U, 212V, and 212W in the electric motor 200, which is executed by the control circuit 70, will be described.

[0073] Fig. 4 is a flowchart schematically showing an example of the main processing of the control circuit 70. Fig. 5 is a diagram showing an example of a gate signal when the power conversion device 100 outputs DC. Fig. 6 is a flowchart schematically showing an example of the sub-processing of the control circuit 70. Fig. 7 is a flowchart schematically showing another example of the sub-processing of the control circuit 70.

[0074] 5A to 5F. FIG. 5A shows a carrier wave 500 and a DC voltage (voltage value V uv ) is applied to V u * ,V v * ,V w * 5A and 5B show voltage command values ​​501, 502, and 503 corresponding to the carrier wave 500 in FIG. 5A. FIGS. 5B and 5C show gate signals for semiconductor switches SW1 and SW2, respectively, generated by comparing carrier wave 500 in FIG. 5A with voltage command value 501. FIGS. 5D and 5E show gate signals for semiconductor switches SW3 and SW4, respectively, generated by comparing carrier wave 500 in FIG. 5A with voltage command value 502. FIGS. 5F and 5G show gate signals for semiconductor switches SW5 and SW6, respectively, generated by comparing carrier wave 500 in FIG. 5A with voltage command value 503.

[0075] 5B to 5G, for the sake of simplicity, the dead time t dis not reflected.

[0076] 6 and 7 are sub-flowcharts of steps S112 and S114 in FIG. 4, respectively.

[0077] 4 starts, for example, when a command to execute the auto-tuning function is input to the control circuit 70. In other words, this flowchart may be executed as part of the auto-tuning function.

[0078] The auto-tuning function is a function that measures various constants (so-called "motor constants") of the electric motor 200 to be used for controlling the electric motor 200, and sets the motor constants.

[0079] As shown in FIG. 4, in step S102, the control circuit 70 applies a DC voltage (voltage value V uv ) is applied, and the current value I u Measure.

[0080] Specifically, the voltage command value calculation unit 701 calculates a DC voltage (voltage value V uv ) to apply the voltage command value V u * ,V v * ,V w * Then, the gate signal generating unit 702 calculates the voltage command value V output from the voltage command value calculating unit 701. u * ,V v * ,V w * Based on this, gate signals are output to the semiconductor switches SW1 to SW6.

[0081] DC voltage between UV, V uv is the output voltage value V of the U phase of the power conversion device 100 u , V phase output voltage value V v , and the voltage between the positive line 21P and the negative line 21N in the DC link 20 (DC link voltage value Vdc ) is expressed by the following equation (1).

[0082]

number

[0083] Voltage command value V u * ,V v * For simplicity, the condition of the following equation (2) is specified.

[0084]

number

[0085] Voltage command value V u * ,V v * is expressed by the following equations (3) and (4) from equations (1) and (2).

[0086]

number

[0087] As a result, the voltage command value calculation unit 701 calculates the voltage value V of the DC voltage between UV based on the equations (3) and (4). uv , and DC link voltage value V dc Using this, the voltage command value V u * ,V v * can be calculated and output.

[0088] Furthermore, the DC link voltage value V dc is detected by a voltage sensor (not shown), and the voltage command value calculation unit 701 converts the detected value into the DC link voltage value V dc It can be used as.

[0089] In addition, since there is no need to flow current to the W phase of the electric motor 200, the voltage command value V w* is zero as shown in the following equation (5).

[0090]

number

[0091] In this way, the voltage command value calculation unit 701 calculates the voltage command value V u * ,V v * ,V w * can be calculated and output.

[0092] For example, as shown in FIGS. 5A to 5C, the gate signal generating unit 702 generates a carrier wave 500, which is a triangular wave with a carrier frequency fsw, and a voltage command value 501 (i.e., a voltage command value V u * ), a gate signal that indicates whether the semiconductor switches SW1 and SW2 are on or off can be generated. Similarly, as shown in FIGS. 5A, 5D, and 5E, the gate signal generation unit 702 generates a gate signal that indicates whether the semiconductor switches SW1 and SW2 are on or off by comparing the carrier wave 500 and the voltage command value 502 (i.e., the voltage command value V v * ), a gate signal that indicates whether the semiconductor switches SW3 and SW4 are on or off can be generated. Similarly, as shown in FIGS. 5A, 5F, and 5G, the gate signal generation unit 702 generates a gate signal that indicates whether the semiconductor switches SW3 and SW4 are on or off by comparing the carrier wave 500 and the voltage command value 503 (i.e., the voltage command value V w * ) to generate gate signals that indicate the on / off states of the semiconductor switches SW5 and SW6.

[0093] The resistance value calculation unit 703 calculates a DC voltage (voltage value V uv ) is applied, the current value I u can be measured.

[0094] When the process of step S102 is completed, the control circuit 70 proceeds to step S104.

[0095] In step S104, the control circuit 70 applies a DC voltage (voltage value V vw ) is applied, and the current value I v (=I w ) is measured.

[0096] Specifically, the voltage command value calculation unit 701 calculates a DC voltage (voltage value V vw ) to apply the voltage command value V u * ,V v * ,V w * Then, the gate signal generating unit 702 calculates the voltage command value V output from the voltage command value calculating unit 701. u * ,V v * ,V w * Based on this, gate signals are output to the semiconductor switches SW1 to SW6.

[0097] DC voltage between V and W, V vw is the V-phase output voltage value V of the power conversion device 100 v , W phase output voltage value V w , and DC link voltage value V dc Using this, it is expressed by the following equation (6).

[0098]

number

[0099] Voltage command value V v * ,V w * For simplicity, the condition of the following equation (7) is specified.

[0100]

number

[0101] Voltage command value Vu * ,V v * is expressed by the following equations (8) and (9) from equations (6) and (7).

[0102]

number

[0103] As a result, the voltage command value calculation unit 701 calculates the voltage value V of the DC voltage between V and W based on the equations (8) and (9). vw , and DC link voltage value V dc Using this, the voltage command value V v * ,V w * can be calculated and output.

[0104] In addition, since there is no need to flow current to the U phase of the electric motor 200, the voltage command value V u * is zero as shown in the following equation (10).

[0105]

number

[0106] In this way, the voltage command value calculation unit 701 calculates the voltage command value V u * ,V v * ,V w * can be calculated and output.

[0107] 5, the gate signal generator 702 generates a carrier wave 500 and a voltage command value V u * ,V v * ,V w * By comparing these with each other, gate signals for the semiconductor switches SW1 to SW6 can be generated.

[0108] The resistance value calculation unit 703 calculates a DC voltage (voltage value V vw ) is applied, the current value I v can be measured.

[0109] When the process of step S104 is completed, the control circuit 70 proceeds to step S106.

[0110] In step S106, the control circuit 70 applies a DC voltage (voltage value V wu ) is applied, and the current value I w Measure.

[0111] Specifically, the voltage command value calculation unit 701 calculates a DC voltage (voltage value V wu ) to apply the voltage command value V u * ,V v * ,V w * Then, the gate signal generating unit 702 calculates the voltage command value V output from the voltage command value calculating unit 701. u * ,V v * ,V w * Based on this, gate signals are output to the semiconductor switches SW1 to SW6.

[0112] DC voltage value between W and U, V wu is the W-phase output voltage value Vw of the power conversion device 100, and the U-phase output voltage value V u , and DC link voltage value V dc Using this, it is expressed as follows by equation (11).

[0113]

number

[0114] Voltage command value V w * ,V u* For simplicity, the condition of the following equation (12) is specified.

[0115]

number

[0116] Voltage command value V w * ,V u * are expressed by the following equations (13) and (14) from equations (11) and (12).

[0117]

number

[0118] As a result, the voltage command value calculation unit 701 calculates the voltage value V of the DC voltage between W and U based on the equations (13) and (14). wu , and DC link voltage value V dc Using this, the voltage command value V w * ,V u * can be calculated and output.

[0119] In addition, since there is no need to flow current to the V phase of the electric motor 200, the voltage command value V v * is zero as shown in the following equation (15).

[0120]

number

[0121] In this way, the voltage command value calculation unit 701 calculates the voltage command value V u * ,V v * ,V w * can be calculated and output.

[0122] 5, the gate signal generator 702 generates a carrier wave 500 and a voltage command value V u * ,V v * ,V w * By comparing these with each other, gate signals for the semiconductor switches SW1 to SW6 can be generated.

[0123] The resistance value calculation unit 703 calculates a DC voltage (voltage value V vw ) is applied, the current value I w can be measured.

[0124] When the process of step S106 is completed, the control circuit 70 proceeds to step S108.

[0125] In step S108, the resistance value R uv ,R vw ,R wu Calculate.

[0126] Resistance value R uv is the resistance value of the combined resistance component corresponding to the series connection of the resistance component 214U and the resistance component 214V via the neutral point 211NP. vw is the resistance value of the combined resistance component of the series connection of the resistance component 214V and the resistance component 214W via the neutral point 211NP. wu is the resistance value of the combined resistance component of the series connection of the resistance component 214W and the resistance component 214U via the neutral point 211NP.

[0127] Specifically, the resistance value R uv ,R vw ,R wu is the voltage value V uv and current value I u , voltage value V vw and current value I v , and voltage value V wu and current value I wUsing the above, it is expressed by the following equations (16) to (18).

[0128]

number

[0129] As a result, for example, the power conversion device 100 is supplied with a voltage value V uv ,V vw ,V wu When the resistance value calculation unit 703 is equipped with a detection function for detecting the resistance R uv ,R vw ,R wu can be calculated.

[0130] On the other hand, for example, when the power conversion device 100 is supplied with a voltage value V uv ,V vw ,V wu If the resistance value calculation unit 703 does not have the function of detecting the voltage value V uv ,V vw ,V wu Instead, the voltage command value V uv * ,V vw * ,V wu * can be used.

[0131] Here, as shown in equations (19) and (22), the actual DC voltage value V between UV uv and the voltage command value V of the DC voltage between UV uv * (=V u * -V v * ) there is a dead time t d The error voltage value associated with the dead time error voltage value V d Similarly, as shown in equations (20) and (22), the actual DC voltage value V between V and W uv and the voltage command value V vw * (=V v * -Vw * ) between the dead time error voltage value V d Similarly, the DC voltage between W and U is V wu and the DC voltage command value V between W and U wu * (=V w * -V u * ) between the dead time error voltage value V d occurs.

[0132]

number

[0133] Therefore, the power conversion device 100 has a voltage value V uv When the detection function is not installed, the resistance value calculation unit 703 calculates the voltage command value V at each of the two operating points A and B. uv * and current value I u Based on this, the resistance value R uv Similarly, the power conversion device 100 calculates the voltage value V vw When the resistance value calculation unit 703 is not equipped with the detection function of the voltage command value V vw * and current value I v Based on this, the resistance value R vw Similarly, the power conversion device 100 calculates the voltage value V wu When the resistance value calculation unit 703 is not equipped with the detection function of wu * and current value I w Based on this, the resistance value R vw Calculate.

[0134]

number

[0135] This allows the control circuit 70 to eliminate the influence of the dead time error.

[0136] When the process of step S108 is completed, the control circuit 70 proceeds to step S110.

[0137] In step S110, the control circuit 70 calculates the resistance value R of the resistance component 214U of each of the U-phase, V-phase, and W-phase. u , the resistance value R of the resistance component 214V v , and the resistance value R of the resistance component 214W w Calculate.

[0138] Resistance value R u ,R v ,R w is the resistance value (primary resistance value R1) of resistance components 212V, 212U, 212W, and the resistance value R of each of resistance components 151U, 151V, 151W L_u ,R L_v ,R L_w Using the above, it is expressed by the following equations (26) to (28).

[0139]

number

[0140] Resistance value R u ,R v ,R w are expressed by the following equations (29) to (31) from equations (16) to (18) and equations (26) to (28).

[0141]

number

[0142] As a result, the resistance value calculation unit 703 calculates the resistance value R uv ,R vw ,R wu Based on this, the resistance value R u ,R v ,R wcan be calculated.

[0143] When the process of step S110 is completed, the control circuit 70 proceeds to step S112.

[0144] In step S112, the control circuit 70 calculates the resistance values ​​R of the resistance components 214U, 214V, and 214W of the respective phases. u ,R v ,R w Specifically, the control circuit 70 executes the process shown in the flowchart of FIG.

[0145] As shown in FIG. 6, in step S202, the resistance value calculation unit 703 calculates the resistance value R u ,R v ,R w Average value of resistance (average value R AVE ) is calculated.

[0146]

number

[0147] When the process of step S202 is completed, the control circuit 70 proceeds to step S204.

[0148] In step S204, the resistance value calculation unit 703 calculates the average resistance value R AVE and the resistance values ​​R of the U, V, and W phases. u ,R v ,R w Difference with R u_D ,R v_D ,R w_D Calculate.

[0149]

number

[0150] When the process of step S204 is completed, the control circuit 70 proceeds to step S206.

[0151] In step S206, the resistance value calculation unit 703 calculates the difference R u_D ,R v_D ,R w_D At least one of the following is within the tolerance R t Determine whether or not the tolerance R is exceeded. t For example, the average resistance R AVE Specifically, the resistance value calculation unit 703 determines whether or not at least one of the conditions in the following expressions (36) to (38) is satisfied.

[0152]

number

[0153] Resistance value calculation section 703 proceeds to step S208 if at least one of the conditions in equations (36) to (38) is satisfied, and proceeds to step S210 otherwise.

[0154] In step S208, the resistance value calculation unit 703 determines that there is variation in the resistance components 151U, 151V, and 151W of the wiring 150. As described above, the presence of variation in the resistance components 151U, 151V, and 151W of the wiring 150 means that the variation is within a predetermined standard (specifically, the variation allowable value R t) is exceeded. Then, the resistance value calculation unit 703 notifies the user that there is a variation in the resistance components 151U, 151V, and 151W of the wiring 150. This allows the control circuit 70 to prompt the user to improve the state in which there is a variation in the resistance components 151U, 151V, and 151W of the wiring 150. Therefore, for example, the variation in the resistance components 151U, 151V, and 151W of the wiring 150 can be improved by changing the layout of the wiring 150 or replacing the wiring 150. This prevents, for example, a situation in which the control of the electric motor 200 becomes unstable, and the control circuit 70 can more appropriately control the electric motor 200. Furthermore, for example, the occurrence of current imbalance among the phases due to the variation in impedance of the wiring 150 is prevented, and a situation in which the generation of harmonic components due to the current imbalance makes it impossible to properly diagnose an abnormality in the electric motor using the harmonic components can be prevented.

[0155] The resistance value calculation unit 703, for example, displays information indicating that there is variation in the resistance components 151U, 151V, and 151W of the wiring 150 on the display unit 80. Furthermore, the resistance value calculation unit 703 may transmit the information indicating that there is variation in the resistance components 151U, 151V, and 151W of the wiring 150 to the management device 250 or the terminal device 300 via the communication unit 90.

[0156] On the other hand, in step S210, the resistance value calculation unit 703 determines that there is no variation in the resistance components 151U, 151V, and 151W of the wiring 150. As described above, the absence of variation in the resistance components 151U, 151V, and 151W of the wiring 150 means that the variation is within a predetermined standard (specifically, the variation allowable value R t ) is not exceeded.

[0157] The resistance value calculation unit 703 may notify the user that there is no variation in the resistance components 151U, 151V, and 151W of the wiring 150.

[0158] When the process of step S208 or step S210 is completed, the control circuit 70 ends the process of this flowchart, that is, the process of step S112 in FIG.

[0159] Returning to FIG. 4, when the control circuit 70 completes the process of step S112, the process proceeds to step S114.

[0160] In step S114, the control circuit 70 sets the primary resistance value R1. Specifically, the control circuit 70 executes the flowchart of FIG.

[0161] As shown in FIG. 7, in step S302, the resistance value calculation unit 703 calculates the resistance values ​​R u ,R v ,R w The minimum value of the resistance (minimum resistance R MIN ) to get the

[0162] When the process of step S302 is completed, the control circuit 70 proceeds to step S304.

[0163] In step S304, the resistance value calculation unit 703 calculates the minimum resistance value R MIN is set as the primary resistance value R1.

[0164] This allows the control circuit 70 to set the resistance value of the resistance component among the resistance components 214U, 214V, and 214W that has the smallest resistance value of the resistance component of the wiring 150 included therein as the primary resistance value R1. Therefore, the control circuit 70 can minimize the error between the actual primary resistance value R1 and the set value of the primary resistance value R1.

[0165] For example, if the error between the actual primary resistance value R1 and the set value of the primary resistance value R1 is relatively large, when an impulse load disturbance or the like occurs in the low-speed rotation range of the motor 200, a discrepancy will occur between the actual phase error value and the estimated phase error value, and as a result, the optimal phase cannot be controlled, and the motor may fall into a state of out-of-step.

[0166] In contrast, in this example, the control circuit 70 can minimize the error between the actual value and the set value of the primary resistance value R1, thereby preventing situations in which the control becomes unstable as described above and enabling appropriate control of the electric motor 200.

[0167] When the process of step S302 is completed, the control circuit 70 ends the process of the flowchart, that is, ends the process of step S114 in FIG.

[0168] Returning to FIG. 4, when the control circuit 70 completes the process of step S114, it ends the process of the flowchart.

[0169] [Other embodiments] Next, another embodiment will be described.

[0170] The above-described embodiment may be modified or changed as appropriate. Hereinafter, examples in which the above-described embodiment is modified or changed will be referred to as "modified examples" for convenience.

[0171] For example, in the above-described embodiment, in the stator 210 of the electric motor 200, the windings 211U, 211V, 211W may be connected in a Δ (delta) connection instead of a Y connection.

[0172] For example, Fig. 8 is a diagram showing another example of the equivalent circuit of the wiring 150 and the electric motor 200 when the power conversion device 100 outputs DC. Specifically, Fig. 8 is a diagram showing a specific example of the equivalent circuit of the wiring 150 and the electric motor 200 when the power conversion device 100 outputs DC in a case where the windings 211U, 211V, and 211W are connected in a Δ connection.

[0173] Fig. 8 includes Figs. 8A to 8C. Fig. 8A is an equivalent circuit of the wiring 150 and the electric motor 200 when a DC voltage is applied between U and V of the power conversion device 100. Fig. 8B is an equivalent circuit of the wiring 150 and the electric motor 200 when a DC voltage is applied between V and W of the power conversion device 100. Fig. 8C is an equivalent circuit of the wiring 150 and the electric motor 200 when a DC voltage is applied between the W phase and U phase of the power conversion device 100 (hereinafter simply referred to as "between W and U").

[0174] As shown in FIG. 8A, in this example, when a DC voltage is applied between U and V of the power conversion device 100, a DC voltage is applied across the resistance component 151U of the wiring 150U, the resistance component 212U of the U-phase winding 211U, and the resistance component 151V of the wiring 150V.

[0175] Also, as shown in FIG. 8B, in this example, when a DC voltage is applied between V and W of the power conversion device 100, a DC voltage is applied across the resistance component 151V of the wiring 150V, the resistance component 212V of the V-phase winding 211V, and both ends of the resistance component 151V of the wiring 150V.

[0176] Also, as shown in FIG. 8C, in this example, when a DC voltage is applied between W and U of the power conversion device 100, a DC voltage is applied across both ends of the resistance component 151W of the wiring 150W, the resistance component 212W of the W-phase winding 211W, and the resistance component 151U of the wiring 150U.

[0177] Therefore, in this example, it can be considered that the U-phase resistance component 214U includes the resistance component 151U and half of the primary resistance, the V-phase resistance component 214V includes the resistance component 151V and half of the primary resistance, and the W-phase resistance component 214W includes the resistance component 151W and half of the primary resistance. Therefore, in this example, the resistance values ​​R of the resistance components 214U, 214V, and 214W are u ,R v ,R w is expressed by the following equations (39) to (41).

[0178]

number

[0179] As a result, the resistance value calculation unit 703 can perform the same processing as steps S102 to S114 in Fig. 2 by using equations (39) to (41) instead of the above equations (16) to (18). In this case, in step S114 in Fig. 2, specifically in step S304 in Fig. 7, the resistance value calculation unit 703 calculates the minimum resistance value R MIN Set the primary resistance value R1 to twice the value of the above.

[0180] In the above-described embodiment and its modifications, at least one of the processes in steps S112 and S114 in FIG. 4 may be omitted.

[0181] In the above-described embodiment and its modified examples, the resistance value calculation unit 703 calculates the resistance value R instead of or in addition to the notification information (information indicating the presence or absence of variation) in steps S208 and S210 of FIG. u ,R v ,R w The user may be notified of information representing the above.

[0182] In the above-described embodiment and its modified examples, the notification information and the resistance value R u ,R v ,R w Instead of or in addition to the information representing the difference R u_D ,R v_D ,R w_D Information and differential R u_D ,R v_D ,R w_D and the tolerance for variation R t The user may be notified of information indicating the magnitude relationship between the two.

[0183] Furthermore, in the above-described embodiment and its variations, the resistance value calculation unit 703 may output the notification information to the user in response to a request from the user, instead of or in addition to automatically notifying the user of the notification information during the processing of the flowchart in Fig. 4. For example, in response to a request made by a user operation, the notification information is output to a recording medium (e.g., a USB (Universal Serial Bus) memory or an SD card) mechanically connected to the power conversion device 100 in a predetermined manner. Furthermore, in response to a request from the user received through the communication unit 90, the notification information may be output (i.e., transmitted) to the management device 250 or the terminal device 300.

[0184] In the above-described embodiment and its modifications, the function of the resistance value calculation unit 703 may be realized by an information processing device that is mounted on the power conversion device 100 and that is separate from the control circuit 70 .

[0185] In the above-described embodiment, the function of the resistance value calculation unit 703 may be transferred to the outside of the power conversion device 100. For example, the function of the resistance value calculation unit 703 may be transferred to the management device 250 or the terminal device 300.

[0186] Furthermore, in the above-described embodiment and its modifications, the power conversion device 100 may be configured so that direct current can be input from the outside to the DC link 20. In this case, the rectifier circuit 10 may be omitted.

[0187] Furthermore, in the above-described embodiment and its modified examples, the power conversion device 100 may be a matrix converter capable of directly converting three-phase AC power of R phase, S phase, and T phase into three-phase AC power of U phase, V phase, and W phase.

[0188] [Effect] Next, the operations of the information processing device, the power conversion device, and the information processing method according to this embodiment will be described.

[0189] In a first aspect of this embodiment, an information processing device outputs information relating to the resistance values ​​of the U, V, and W phases of the electric motor, based on voltage values ​​and current values ​​when DC voltages are applied between the U and V phases, the V and W phases, and the W and U phases of the electric motor. The information processing device is, for example, the above-mentioned control circuit 70, management device 250, or terminal device 300. The electric motor is, for example, the above-mentioned electric motor 200. The information relating to the resistance values ​​of the U, V, and W phases of the electric motor is, for example, the resistance values ​​R of the U, V, and W phases of the above-mentioned electric motor 200. u ,R v ,R w This is information that represents the above.

[0190] In addition, in a first aspect of this embodiment, the power conversion device may include a main circuit and a processing unit. The power conversion device is, for example, the above-mentioned power conversion device 100. The main circuit unit is, for example, the above-mentioned main circuit 100MC. The processing unit is, for example, the above-mentioned control circuit 70. Specifically, the main circuit unit may drive the electric motor by converting externally supplied power into predetermined power and outputting it. The processing unit may output information on resistance values ​​of the U phase, V phase, and W phase of the electric motor based on voltage values ​​and current values ​​when DC voltages are applied between the U phase and V phase, the V phase and W phase, and the W phase and U phase of the electric motor. The resistance values ​​of the U phase, V phase, and W phase of the electric motor may be, for example, the above-mentioned resistance value R u ,R v ,R w The information about the resistance values ​​of the U-phase, V-phase, and W-phase of the motor is, for example, the above-mentioned resistance value R u ,R v ,R w The information about the resistance values ​​of the U-phase, V-phase, and W-phase of the motor is, for example, the above-mentioned resistance value R u ,R v ,R w The information about the resistance values ​​of the U-phase, V-phase, and W-phase of the electric motor may be, for example, the information about the resistance values ​​R u ,R v ,R w(specifically, the variation is within the tolerance R t It may also be information indicating whether the

[0191] In addition, a first aspect of the present embodiment may provide an information processing method executed by an information processing device. Specifically, in the information processing method of this aspect, the information processing device may output information on resistance values ​​of the U phase, V phase, and W phase of the electric motor based on voltage values ​​and current values ​​when DC voltages are applied between the U phase and V phase, the V phase and W phase, and the W phase and V phase of the electric motor.

[0192] This allows the information processing device or processing unit (hereinafter referred to as "information processing device, etc.") to inform the user of information regarding, for example, the resistance values ​​of the U, V, and W phases of the electric motor. Therefore, for example, if there is variation in the resistance values ​​of the U, V, and W phases of the electric motor, including the resistance component of the wiring, the user who sees the information can be prompted to improve the situation. Therefore, as a result of improving the situation, the information processing device, etc. can prevent a situation in which control of the electric motor becomes unstable due to variation in the resistance values ​​of each phase of the electric motor, and can achieve appropriate control of the electric motor.

[0193] In a second aspect of the present embodiment, based on the first aspect described above, resistance values ​​of the U-phase, V-phase, and W-phase of the electric motor as seen from a power conversion device that drives the electric motor may be obtained based on the voltage value and the current value between the respective phases, and information on the variation thereof may be output. The information representing the variation may be, for example, the above-mentioned resistance value R u ,R v ,R w The average resistance R AVE Difference R u_D ,R v_D ,R w_D The information about the variation is the information representing the difference R u_D ,R v_D ,R w_D and the tolerance for variation R tThe information regarding the variation may be information representing the magnitude relationship between the resistance value R u ,R v ,R w Presence or absence of variation (specifically, the differential R u_D ,R v_D ,R w_D is the variation tolerance R t It may also be information indicating whether the

[0194] This allows the information processing device, etc. to inform the user of the resistance value of each phase of the motor as seen from the power conversion device that drives the motor, i.e., the variation in the resistance value of each phase of the motor, including the resistance of the wiring between the power conversion device and the motor.

[0195] In a third aspect of this embodiment, based on the second aspect described above, the information processing device or the like may determine whether the variation is relatively large with respect to a predetermined standard (specifically, whether it is larger than the predetermined standard or whether it is equal to or greater than the predetermined standard), and output information representing the determination result. The information regarding the determination result may be, for example, the resistance value R u ,R v ,R w Presence or absence of variation (specifically, the differential R u_D ,R v_D ,R w_D is the variation tolerance R t This information indicates the result of the judgment whether the value exceeds the threshold.

[0196] This allows the information processing device or the like to inform the user whether or not there is a problem with the variation in the resistance values ​​of each phase of the motor, including the resistance of the wiring between the power conversion device and the motor.

[0197] Furthermore, in a fourth aspect of the present embodiment, on the premise of any one of the above-described first to third aspects, an information processing device or the like may acquire a resistance value between the phases of the motor as seen from a power conversion device that drives the motor based on the voltage value and the current value between the phases, and may acquire resistance values ​​of the U phase, V phase, and W phase of the motor as seen from a power conversion device that drives the motor based on the acquired resistance values ​​between the phases. The resistance value between the phases of the motor may be, for example, the above-described resistance value R uv ,R vw ,R wu is.

[0198] This allows the information processing device or the like to acquire the resistance value of each phase of the electric motor, including the resistance of the wiring between the power conversion device and the electric motor.

[0199] In addition, in a fifth aspect of the present embodiment, based on the above-described fourth aspect, the voltage value may be a voltage command value for applying a DC voltage between each of the phases. The voltage command value may be, for example, the above-described voltage command value V uv * ,V vw * ,V wu * The information processing device or the like may acquire a resistance value between the phases of the motor as viewed from the power conversion device, based on the voltage value and the current value at two mutually different operating points.

[0200] This allows the information processing device or the like to acquire the resistance value between each phase, taking into consideration the error due to the dead time when the voltage command value is used as the voltage value.

[0201] In a sixth aspect of the present embodiment, based on the fourth or fifth aspect described above, the information processing device or the like may set a primary resistance value of the electric motor used for controlling the electric motor based on resistance values ​​of the U-phase, V-phase, and W-phase of the electric motor as seen from the power conversion device. The primary resistance value of the electric motor is, for example, the primary resistance value R1 described above.

[0202] This allows the information processing device or the like to set the primary resistance value of the motor used for vector control or the like, for example.

[0203] In a seventh aspect of this embodiment, based on the sixth aspect described above, the information processing device or the like may set the primary resistance value based on the minimum value of the resistance values ​​of the U-phase, V-phase, and W-phase of the motor as seen from the power conversion device. The minimum value may be, for example, the above-mentioned R MIN is.

[0204] This allows the information processing device etc. to suppress the error between the actual value and the set value of the primary resistance of the motor, thereby preventing the situation in which the control of the motor becomes unstable due to the error between the actual value and the set value of the primary resistance of the motor.

[0205] Although the embodiments have been described in detail above, the present disclosure is not limited to such specific embodiments, and various modifications and variations are possible within the scope of the gist described in the claims. [Explanation of symbols]

[0206] 1. Drive system 10 Rectifier circuit 20 DC Link 21 DC line 21N negative line 21P positive line 22 Smoothing circuit 22C smoothing capacitor 30 Inverter circuit 40 Current Sensor 40U Current Sensor 40W Current Sensor 70 Control circuit 80 Display section 90 Communications Department 100 Power conversion device 100MC main circuit 150 Wiring 150U cabling 150V wiring 150W wiring 151U resistance component 151V resistance component 151W Resistance component 200 Electric motor 210 Stator 211NP Neutral point 211U winding 211V winding 211W winding 212U resistance component 212V resistance component 212W resistance component 214U resistance component 214V resistance component 214W resistance component 220 rotor 250 Management device 300 Terminal Device 701 Voltage command value calculation unit 702 Gate signal generator 703 Resistance value calculation unit I u Current value I v Current value I w Current value PS commercial power supply R1 Primary resistance value R AVE Resistance average value R L_u Resistance value R L_v Resistance value R L_w Resistance value R MIN Resistance Minimum R t Variation tolerance R u Resistance value R u_D difference R uv Resistance value R v Resistance value R v_D difference R vw Resistance value R w Resistance value R w_D difference R wu Resistance value SW1~SW6 semiconductor switches t d Dead Time V d Dead time error voltage value V dc DC link voltage value V u * Voltage command value V u Output voltage value V uv * Voltage command value V uv Voltage value V v * Voltage command value V v Output voltage value V vw * Voltage command value V vw Voltage value V w * Voltage command value V w Output voltage value V wu * Voltage command value V wu Voltage value

Claims

1. outputting information relating to the resistance values ​​of the U phase, V phase, and W phase of the electric motor based on voltage values ​​and current values ​​when a DC voltage is applied between the U phase and the V phase, between the V phase and the W phase, and between the W phase and the U phase of the electric motor; Information processing device.

2. based on the voltage value and the current value between the respective phases, resistance values ​​of the U phase, V phase, and W phase of the electric motor as viewed from a power conversion device that drives the electric motor are obtained, and information regarding the variations therein is output; The information processing device according to claim 1 .

3. determining whether the variation is relatively large with respect to a predetermined standard, and outputting information representing the determination result; The information processing device according to claim 2 .

4. a resistance value between the phases of the electric motor as seen from a power conversion device that drives the electric motor is obtained based on the voltage value and the current value between the phases, and a resistance value of the U phase, V phase, and W phase of the electric motor as seen from a power conversion device that drives the electric motor is obtained based on the obtained resistance value between the phases; The information processing device according to claim 1 .

5. the voltage values ​​are voltage command values ​​for applying DC voltages between the phases, acquiring a resistance value between the phases of the electric motor as viewed from the power conversion device based on the voltage value and the current value at two mutually different operating points; The information processing device according to claim 4 .

6. a primary resistance value of the electric motor used for controlling the electric motor is set based on resistance values ​​of the U phase, the V phase, and the W phase of the electric motor as seen from the power conversion device; The information processing device according to claim 4 .

7. setting the primary resistance value based on a minimum value of resistance values ​​of the U phase, the V phase, and the W phase of the electric motor as viewed from the power conversion device; The information processing device according to claim 6 .

8. a main circuit section that converts externally supplied power into a predetermined power and outputs the converted power to drive the electric motor; a processing unit that outputs information relating to resistance values ​​of the U phase, V phase, and W phase of the electric motor based on voltage values ​​and current values ​​when a DC voltage is applied between the U phase and the V phase, the V phase and the W phase, and the W phase and the U phase of the electric motor, Power conversion device.

9. an information processing device outputs information relating to resistance values ​​of the U-phase, V-phase, and W-phase of the electric motor based on voltage values ​​and current values ​​when DC voltages are applied between the U-phase and V-phase, the V-phase and W-phase, and the W-phase and V-phase of the electric motor; Information processing methods.

Images