JP4481838B2 - Circuit simulator, circuit simulator creation method, circuit simulator program, and recording medium - Google Patents

Description

The present invention is a circuit simulator used for the analysis of electrical equipment such as an electric motor, the method of creating the circuit simulator, the program realizing the circuit simulator, and a recording medium for storing the program. In particular, the present invention relates to a technique for determining an equivalent circuit of a coil that constitutes a magnetic circuit in an electric device and to improve the performance of a commercially available program for a normal circuit simulator in order to further adapt an analysis model by a circuit simulator to an actual coil. Further, it relates to a technique for improving practicality.

  When home appliance manufacturers, automobile manufacturers, etc. use electric motors in their products, for example, a detailed examination of the operating characteristics of the electric circuit is generally performed using a circuit simulator before the actual machine is manufactured. Is called. In this case, in the circuit simulator, the electric motor is handled as an apparatus including an electrical element included in the mechanical structure portion and a control circuit that performs power feeding control on the mechanical structure portion. When the electric motor is calculated by the circuit simulator, the electric motor is expressed as an electric equivalent circuit, and usually the electric elements of the electric motor in the circuit simulator are used.

  The circuit simulator is realized by executing a simulation program for performing a simulation process on the configuration and operation of an electric circuit equivalent to an electric motor by a computer. The user operator installs the simulation program on a computer, starts and executes it, and simulates the operation of the electric motor through the electrical equivalent circuit while observing the state of the electrical equivalent circuit displayed on the screen of the computer display unit. Do. For the circuit simulator, commercially available software is generally used. For example, products such as “PSIM” (manufactured by POWERSIM INC) and “Matlab (registered trademark) / Simulink (registered trademark)” (manufactured by The MathWorks, Inc.) are sold as this circuit simulator.

  In a conventional commercially available circuit simulator, it is possible to set several electrical characteristics for the motor element. According to the circuit simulation, the calculation of the electric circuit is matched with the actual measurement value, and the performance of the product is evaluated without going through trial production. Thereby, the performance evaluation of the electric circuit can be performed in advance, and the performance evaluation can be performed in a short cycle with a short calculation time.

  However, according to the conventional circuit simulator, the electric characteristic value to be set is a constant value based on the lumped constant, and is set so that the electric characteristic value cannot be changed during the simulation by the computer. However, in an actual motor of an electric motor, the electric characteristic values of the motor elements such as inductance change from time to time. For this reason, there has been a problem in that there is a difference between the calculation result obtained by the conventional circuit simulator and the actual measurement value in the actual machine, and the calculation accuracy is poor.

  As a solution to the above-described conventional problems, the electrical characteristics of the electric motor are analyzed in advance (electromagnetic field analysis) by applying the finite element method, and data on the electrical characteristics of the electric motor that changes every moment is acquired. Thus, a method has been proposed in which the data of the electrical characteristic value is connected to a circuit simulator (Patent Documents 1 and 2). More specifically, the electric characteristic value of the electric motor corresponding to the situation is extracted based on the finite element method, a database of the electric characteristic value is created, and the circuit simulator performs calculation referring to the database.

  The magnetic field analysis based on the finite element method can analyze a single characteristic of the mechanical structure portion of the electric motor. However, it takes an enormous amount of time if it is directly coupled to the electric circuit.

Further, when connecting the magnetic field analysis of the finite element method and the circuit simulator, there is a problem that it is necessary to extract electrical characteristic data in advance as described above. Also, a database of electrical characteristics is created. Since the database has nonlinearity, it is necessary to perform iterative calculation with a circuit simulator. Therefore, when the nonlinear iterative calculation cannot be executed on the circuit simulator, the data of the nonlinear characteristic cannot be handled.
JP 2003-75521 A JP 2003-85218 A

  Normally, the variable circuit elements provided to the user by a conventional commercially available circuit simulator are only a current source and a voltage source, and there are no variable inductance elements. However, since the actual characteristics of the coils constituting the magnetic circuit handled by an electric device such as an electric motor are not constant values but variable values, there is some way to handle an inherently variable inductance element with a circuit simulator. Modeling is required.

In view of the above problems, an object of the present invention is to analyze an electric device such as an electric motor including a coil that constitutes a magnetic circuit, and eliminates the need for iterative calculation when handling nonlinear characteristic data with respect to the coil. values practical modeling can be implemented as a variable value, to provide a method of creating very high circuitry simulator Ru can be and circuit simulator, versatility.

  Another object of the present invention is to provide a program for realizing a circuit simulator having the above characteristics using commercially available circuit simulator software, and a recording medium for storing the program.

Circuit simulator or the like according to the present invention, in order to achieve the above object, configured as follows.

Circuit simulator according to the present invention (corresponding to claim 1),
A circuit simulator for analyzing an electric device including a coil constituting a magnetic circuit,
The equivalent circuit portion of the coil in the circuit simulator is configured with an inductance component, and
The equivalent circuit portion of the inductance component determines the current value of the current source based on the current source that outputs the current, the voltage extraction means that extracts the voltage between the terminals of the current source, and the voltage value output by the voltage extraction means And a current path that is connected in parallel to the current source and allows a regenerative current to flow during the off operation .

As an equivalent circuit model of a coil as a circuit element included in the circuit simulator described above, the circuit is composed of an inductance component and has good connectivity with a commercially available circuit simulator for analysis of electrical equipment including the coil. The analysis capability of the simulator can be matched to the actual machine. The above electric device is an electric device including a coil constituting a magnetic circuit as a part, and is typically an electric motor.
In addition, with the above configuration, the value of the inductance component can be made variable, and a circuit simulator including an equivalent circuit model of an electric device including a coil reflecting characteristics of an actual machine can be realized.

Other circuit simulator according to the present invention (corresponding to claim 2), in the above circuit simulator, preferably current path for flowing the regenerative current is composed of a diode element resistance element and a switching element and current direction Is composed of two opposite energization paths, and includes a circuit unit that controls the on / off operation of each of the switch elements of the two energization paths according to the energization direction during the off operation.

Other circuit simulator according to the present invention (corresponding to claim 3), in the above circuit simulator, preferably, the current generator receives as input any physical quantity of the voltage or the like, representing a non-linear electrical properties as the output current Database. In this database, the input can handle an arbitrary physical quantity including a voltage value, thereby expressing an unspecified nonlinear electrical characteristic. Thus, the inductance component that can be handled by the present invention can be applied without specifying what kind of nonlinear characteristic it is. As an arbitrary physical quantity, unspecified parameters such as a motor rotation angle and temperature information, other coil operation states, and past energization states can be handled as representative ones.

Other circuit simulator according to the present invention (corresponding to claim 4), in the above circuit simulator configured Preferably, the portion of the equivalent circuit of the coil comprises a further resistance component and the induced voltage component. With this configuration, the induced voltage can be calculated by explicitly expressing the term of the induced voltage component in addition to the inductance component. When an equivalent circuit of a coil is expressed using a current source, the current source itself does not have a direct dependency on voltage, and this modeling makes it possible to obtain an induced voltage in a no-load state. .

A method for creating a circuit simulator according to the present invention (corresponding to claim 5 ) is as follows:
In a computer, a method for creating a circuit simulator for analyzing an electric device including a coil constituting a magnetic circuit,
A first step in which an existing commercially available circuit simulator program is installed in a computer and the circuit simulator is prepared to be operable on the computer;
The coil equivalent circuit creation means includes a current source that outputs current, a voltage extraction means that extracts a voltage between terminals of the current source, and a voltage extraction means that outputs a current between terminals of the coil as an equivalent circuit portion that can be incorporated into a circuit simulator. A part of a coil equivalent circuit with an inductance component comprising current generating means for determining a current value of a current source based on a voltage value to be output, and an energization path that is connected in parallel to the current source and allows a regenerative current to flow during an OFF operation A second step in which
The connection means connects the coil equivalent circuit portion by the inductance component created in the second step to the circuit simulator instead of the equivalent coil portion of the existing coil previously incorporated in the circuit simulator. A third step in which a coil equivalent circuit portion based on an inductance component can be incorporated into an existing commercially available circuit simulator without causing a vibration phenomenon during operation of the simulator ;
It is characterized by comprising.

Other methods of creating circuit simulator according to the invention (corresponding to claim 6), in the creation method of the circuit simulator, expressed to include further resistance component parts of the coil equivalent circuit due to the inductance component and the induced voltage component It is characterized by being.

The circuit simulator program according to the present invention (corresponding to claim 7 ) is:
A program for causing a computer to execute a circuit simulator for analyzing an electric device including a coil constituting a magnetic circuit,
On the computer,
The equivalent circuit of the coil in the circuit simulator is expressed by an inductance component.
The equivalent circuit of the inductance component is determined based on the current source that outputs the current, the voltage extraction means that extracts the voltage between the terminals of the current source, and the voltage value output from the voltage extraction means. The present invention is realized by a current generating means and an energization path that is connected in parallel to the current source and allows a regenerative current to flow during the off operation.

Another circuit simulator program according to the present invention (corresponding to claim 8 ) is preferably the above-described circuit simulator program, wherein a current path for supplying a regenerative current to a computer is provided with a diode element, a resistance element, and a switch. made and the energizing direction is two sets of current path opposite from the element, that is realized by a circuit portion for controlling in response to two sets of on-off operation of each switching element of the current path during the oFF operation to the conduction direction Features.

Another circuit simulator program according to the present invention (corresponding to claim 9 ) is preferably the above-described circuit simulator program, wherein the computer is configured to input a current generating means to an arbitrary physical quantity such as a voltage to input a non-linear electric circuit. It is realized by a database expressing characteristics as output current .

Another circuit simulator program (corresponding to claim 10 ) according to the present invention is preferably the above-described circuit simulator program, wherein an equivalent circuit of a coil realized by a computer includes an inductance component, a resistance component and an induced voltage. It is characterized by including an ingredient.

The computer-readable recording medium according to the present invention (corresponding to claim 11 ) is:
A program for causing a computer to execute a circuit simulator for analyzing an electric device including a coil constituting a magnetic circuit,
On the above computer,
The equivalent circuit of the coil in the circuit simulator is expressed by an inductance component.
An equivalent circuit of an inductance component, a current source that outputs a current, a voltage extraction unit that extracts a voltage between terminals of the current source, and a current that determines a current value output from the current source based on a voltage value output from the voltage extraction unit A circuit simulator program is recorded that is realized by the generating means and the energization path that is connected in parallel to the current source and allows the regenerative current to flow during the off operation.

Another computer-readable recording medium according to the present invention (corresponding to claim 12 ) is the above-mentioned recording medium, preferably a current path for supplying a regenerative current to the computer, a diode element, a resistance element, and a switch. For realizing two sets of energization paths composed of elements and having opposite energization directions and a circuit unit for controlling on / off operation of each switch element of the two sets of energization paths according to the energization direction during the off operation A circuit simulator program is recorded .

Another computer-readable recording medium according to the present invention (corresponding to claim 13 ) is the above-mentioned recording medium. Preferably, the current generating means is input to an arbitrary physical quantity such as a voltage to the computer, and is nonlinear. A circuit simulator program for realizing the electrical characteristics as a database expressing the output current is recorded .

Another computer-readable recording medium according to the present invention (corresponding to claim 14 ) is the above-mentioned recording medium. Preferably, an equivalent circuit of a coil realized in a computer includes an inductance component, a resistance component and an induced voltage. A circuit simulator program including components is recorded.

  According to the present invention, when analyzing an electric device including a coil such as an electric motor using a commercially available circuit simulator, a variable inductance component can be handled by an equivalent circuit of a coil constituting a magnetic circuit. It is possible to analyze electrical equipment in the operating environment, and it is not necessary to perform iterative calculation when dealing with nonlinear characteristic data, and it is possible to realize practical modeling with variable values of inductance elements, and extremely versatile circuit A simulator can be realized. In particular, when analyzing the above-mentioned electric equipment over a commercially available circuit simulator, when creating an equivalent circuit model of the electric equipment including the coils constituting the magnetic circuit and connecting it to the circuit simulator, the equivalent of the electric equipment When creating a circuit model, considering the actual machine, the non-linearity of the inductor inductance component of the coil becomes a very important factor and may not be handled well by a commercially available circuit simulator. According to the present invention, for a commercially available circuit simulator, a new and useful equivalent circuit model is proposed as an equivalent circuit of a coil included in an electric device to be analyzed, whereby an equivalent circuit of the electric device and a commercially available circuit are proposed. Improve connectivity with the simulator, and easily handle the non-linearity of the coil inductance component without changing the non-linear calculation without changing the software of the commercially available circuit simulator itself. Can be very high.

  DESCRIPTION OF EMBODIMENTS Preferred embodiments (examples) of the present invention will be described below with reference to the accompanying drawings.

  A representative embodiment of an analysis circuit simulator according to the present invention will be described with reference to FIGS. In this embodiment, the circuit simulator analyzes an electric device including a coil constituting a magnetic circuit, and an electric motor will be described as a representative example of the electric device. 1 shows an equivalent circuit diagram of an electric motor in a circuit simulator, FIG. 2 shows an enlarged view of an equivalent circuit of a U-phase coil portion of the electric motor, and FIG. 3 shows a detailed equivalent circuit of an inductance component of the coil. The equivalent circuit of the electric motor shown in FIG. 1 is configured to include the characteristic coil equivalent circuit according to the present invention based on the aforementioned “PSIM” which is a commercially available circuit simulator software.

  In this embodiment, the electric motor is, for example, a three-phase synchronous motor. In the three-phase synchronous motor, coils of each phase of U, V, and W are connected by, for example, Y-shaped connection. An ON / OFF voltage having a sinusoidal characteristic of each phase forming a three-phase alternating current is applied to the coil of each phase, and the phase of each sinusoidal ON / OFF voltage is shifted by 120 °, so that the inside of the motor. Generates a rotating magnetic field. A three-phase synchronous motor has a rotor formed of magnets. The rotor rotates when the magnetic field generated by the magnet responds to the rotating magnetic field.

  The equivalent circuit of the electric motor in the circuit simulator shown in FIG. 1 represents the rotational behavior of the rotor in the three-phase synchronous motor. In the equivalent circuit diagram of the electric motor, each of the blocks 11U, 11V, and 11W represents a coil of each phase of U, V, and W by an equivalent circuit. The configuration of the equivalent circuit of the three coils 11U, 11V, and 11W is the same. Therefore, FIG. 2 shows only the U-phase coil 11U and a circuit portion related thereto in an enlarged manner, and only the coil 11U will be representatively described.

  In the circuit simulator according to the present embodiment, the equivalent circuit of the coil 11U of the electric motor is preferably composed of a resistance component 12, an induced voltage component 13, and an inductance component 14, as shown in FIG. An example in which the circuit configuration of the equivalent circuit of the coil 11U is expressed by the resistance component 12, the induced voltage component 13, and the inductance component 14 is a representative example, and is not limited thereto. That is, the inductance component 14 is essential for the equivalent circuit of the coil 11U, but the other resistance component 12 and induced voltage component 13 are not essential elements and can be arbitrarily changed.

  Here, with reference to FIG. 4 to FIG. 11, the concept that has led to the expression of the equivalent circuit of the coil 11U as described above will be described.

  In the circuit simulator according to the present embodiment, a model of an equivalent circuit of the coil 11U of the present embodiment is conceptually shown as shown in FIG. That is, the equivalent circuit model of the coil 11U is composed of a resistance component (R), an induced voltage component (−d∥ / dt), and an inductance component (L). The induced voltage component (−d∥ / dt) takes into consideration the voltage generated by the change of the linkage flux given from the outside to the coil 11U. For example, in the case of an electric motor, an induced voltage is generated because the amount of magnetic flux received from a magnet magnetic field during rotation changes. Further, it is assumed that the inductance component (L) is not a fixed constant value but a variable value. Between the equivalent circuit model of the coil 11U shown in FIG. 4 and the equivalent circuit of the coil 11U shown in FIG. 2, the resistance component (R) corresponds to the resistance component 12, and the induced voltage component (−d （/ dt ) Corresponds to the induced voltage component 13, and the inductance component (L) corresponds to the inductance component 14.

  As described above, in the equivalent circuit model of the coil 11U, the inductance component (L) is essential from the viewpoint of versatility of the equivalent circuit model, but the other resistance component (R) and the induced voltage component (−d （/ dt) is not essential. Therefore, the equivalent circuit model of the coil can be expressed and configured only by the inductance component (L).

  Next, the inductance component (L) in the equivalent circuit model of the coil 11U will be considered. Let us look at the inductance component (L) in relation to voltage and current. FIG. 5 shows an inductance component (L) to which a constant voltage (V) is applied from the constant voltage source 15. When a constant voltage (V) is applied to the inductance component (L) by the constant voltage source 15, the current (I) flowing through the inductance component (L) is obtained as I = (1 / L) ∫Vdt. Here, the symbol “∫” means an integral operation symbol.

In a commercially available circuit simulator software such as “PSIM”, when the inductance component (L) of the coil is variably expressed, the equivalent circuit is as shown in FIG. The equivalent circuit of the inductance component (L) is expressed using a current source (variable current source). That is, the equivalent circuit of the inductance component (L) has a voltage extractor (or voltage measuring device) 21 that takes in a voltage (V) that is a voltage between its terminals with respect to the constant voltage source 15, and an output of the voltage extractor 21. A current generator 22 that determines and outputs a current value of the current (I) based on the voltage (V) to be output, and a current source (variable current source) determined by the current value of the current (I) output from the current generator 22 23. The voltage value (V) input to the current generator 22 is given based on the current value (I) of the current source 23. The current value (I) determined by the current generator 22 changes the current value of the current source 23. The current generator 22 calculates the current value I for the input voltage value V based on the above equation “(1 / L) ∫Vdt” and outputs it. Actually, the current generator 22 is prepared as a database on the circuit simulator, and determines a current value with respect to the input voltage value V. Stated calculation procedure in the circuit simulator, the current value of the current source 23 in the first step the voltage (V) on the basis of (I _K) to calculate determined voltage (V _K), the said voltage at the second step A current value (I _{K + 1} ) is determined based on (V _K ), and this is repeated. Therefore, the current source 23 is configured as a variable current source.

  However, when the equivalent circuit shown in FIG. 6 is applied to a commercially available circuit simulator, the following problem occurs.

The voltage supplied to the coils of each phase in the electric motor (three-phase synchronous motor) according to the present embodiment is an on / off voltage supplied from a three-phase bridge circuit in the motor drive circuit. Therefore, when the inductance component of the coil (for example, the coil 11U) including the supplied on / off voltage is shown in an equivalent circuit, it is as shown in FIG. FIG. 7 shows only the constant voltage source 15 and the current source 23 in the equivalent circuit shown in FIG. Between the constant voltage source 15 and the current source 23, an element (IGBT or the like) composed of a switch element 24 and a parallel resistor 25 is connected. In the switch element 24, a closed state indicated by a solid line indicates an ON operation state, and an open state indicated by a broken line indicates an OFF operation state. When an on-voltage is applied to the coil (11U) (when the switch element 24 is on) (voltage V ₁ shown in FIG. 8A), the current flowing through the coil is calculated based on the above integral formula. The Next, when the applied voltage of the coil (11U) is turned off (0) (when the switch element 24 is turned off and time t ₁ shown in FIG. 8A), the current flowing through the coil (11U) is integrated. Based on the action, it continues for an arbitrary time and becomes a large value (FIG. 8B), and a relatively large negative voltage is generated by the current flowing through the parallel resistance 25 of the switch element 24. (Voltage V ₂ shown in FIG. 8C). Further, there is a time difference between the time (t ₁ ) when the applied voltage of the coil (11U) is turned off and the time (t ₂ ) when the negative voltage is generated. Therefore, the circuit simulator obtains the current value as the current source 23 based on the negative voltage value (V ₂ ) in the next stage. As a result, a phenomenon occurs in which the voltage (V) input to the current generator 22 oscillates greatly. When such a vibration phenomenon occurs, the calculation fails on the circuit simulator.

  In order to solve the above problem caused by changing the inductance component of the coil in a commercially available circuit simulator, an equivalent circuit shown in FIG. 9 is proposed as a basic circuit. The equivalent circuit shown in FIG. 9 corresponds to the equivalent circuit shown in FIG. 7. A moderately high resistance element 26 is connected in parallel to the current source 23, and the diode element 27 is not energized in a normal state. Is added. As described above, since the unidirectional energization path 28 is provided in the reverse direction in parallel with the current source 23, when the switch element 24 is turned off, a regenerative current based on a negative voltage flows as indicated by an arrow 29, and flows through the parallel resistor 25. It is possible to prevent current from flowing. As a result, it is possible to eliminate the vibration phenomenon caused by the negative voltage generated when the switch element 24 is turned off.

  As an equivalent circuit of the inductance component (L) portion of the coil 11U, the current source 23 portion does not have directionality with respect to the inductance component itself, so as shown in FIG. Two sets (31, 32) of unidirectional energization paths composed of diode elements D1, D2 and resistance elements R1, R2 are connected in parallel in each direction. Switch elements SW1 and SW2 are connected to the current paths 31 and 32, respectively. The switch elements SW1 and SW2 are switched on / off according to the energization direction.

  Based on the above, the inductance component (L) according to the present embodiment shown in FIG. 4 finally has the constant voltage source 15, the voltage extractor 21, and the current generator described in FIG. 6 as shown in FIG. 11. 22. In addition to the current source 23, the current paths 23 and 32 are connected in parallel to the current source 23. Thereby, an equivalent circuit model of a coil including a variable inductance component is realized in the circuit simulator.

  Returning to FIG. 1 to FIG. In FIG. 2, the inductance component 14 of the coil 11 </ b> U includes a current source 23 and the above-described current paths 31 and 32. In each energization path 31, 32, SW1 and SW2 are switch elements, D1 and D2 are diode elements, and R1 and R2 are resistance elements. The circuit units 41 and 42 are electric circuits for turning on / off the switching elements SW1 and SW2 of the energization paths 31 and 32, respectively.

  The entire equivalent circuit of the electric motor will be described with reference to FIG. In parallel to the coil 11U described above, V-phase and W-phase coils 11V and 11W having the same circuit configuration as the coil 11U are provided. Each of the three terminals 51U, 51V, and 51W is a power supply terminal that supplies an on / off voltage (V) for excitation to the coils 11U, 11V, and 11W.

  A circuit element 52 indicated by a block conceptually indicates an external program. Hereinafter, it is referred to as “external program 52”. The external program 52 corresponds to the current generator 22 described above, and is applied to the applied voltage (V) by the output signal line group 53 with respect to the current source 23 of the inductance component 14 of each of the coils 11U, 11V, and 11W. It is a circuit element that functions as a “database” for giving a corresponding current value (I). The external program 52 also has a function of giving the value of the induced voltage component 13 described above by the output signal line group 56. In addition, as an input signal of the external program 52, a signal related to the applied voltage from each of the terminals 51U, 51V, 51W is input to the external program 52 by the input signal line group 54. Torque information is input from the external program 52 to the block 55 through the signal line 55b, angle information is obtained by solving the equation of motion in the circuit of the block 55, and this angle information is input to the external program 52 through the signal line 55a.

  Signals relating to the current value (I) given to the current sources 23 of the coils 11U, 11V, 11W by the signal lines of the output signal line group 53 are given via the signal converter 61, respectively. At the same time, it is branched and supplied to the adders 65 and 66 of the circuit sections 41 and 42 via the signal discriminators 62a and 62b and the filters 63 and 64. This circuit portion is also shown in FIG.

  The configuration of the circuit part will be described in more detail with reference to FIG. FIG. 3 shows a detailed equivalent circuit of the inductance component 14 of the U-phase coil 11U. In the inductance component 14 of the coil 11U shown in FIG. 3, the above-described unidirectional energization paths 31 and 32 are connected in parallel to the current source 23. The energization path 31 is formed by a series circuit of a switch element SW1, a diode element D1, and a resistance element R1, and the energization path 32 is formed by a series circuit of a switch element SW2, a diode element D2, and a resistance element R2. The circuit section 41 for controlling the on / off operation of the switch element SW1 is attached to the energizing path 31, and the circuit section 42 for controlling the on / off operation of the switch element SW2 is attached to the energizing path 32. Has been.

  The port 67 means an input port to which a U-phase output signal line included in the output signal line group 53 from the external program 52 as a database is connected. Therefore, a signal related to the current value (I) corresponding to the voltage (V) applied to the U-phase coil 11U via the terminal 51U is input to the port 67. A signal related to the current value (I) input to the port 67 is supplied to the signal conversion unit 61 and is added to the adder 65 of the circuit units 41 and 42 via the signal discriminators 62a and 62b and the filters 63 and 64. , 66.

  The signal conversion unit 61 performs signal conversion based on the input signal related to the current value (I) and outputs a signal designating the current value (I) to the current source 23. The current source 23 determines the current value (I) to be output based on the signal output from the signal converter 61. Thus, the current source 23 determines the current value based on the signal given from the external program 52 which is a database. Thereby, the inductance component 14 of the U-phase coil 11U in which an equivalent circuit is expressed using the current source 23 is made variable according to the rotor of the electric motor, the current value, and the like.

  However, as described above, the energization paths 31 and 32 for preventing the above-described vibration phenomenon are provided so that the calculation on the circuit simulator does not fail, and the switch elements SW1 and SW2 of the energization paths 31 and 32 are turned on / off. Circuit portions 41 and 42 for controlling the off operation according to the direction of current application are provided. Each of the circuit portions 41 and 42 is formed by the adders 65 and 66 and the diode 68 described above.

  The signal discriminators 62a and 62b to which the signal related to the current value (I) is supplied determine whether the signal related to the current value (I) is positive or negative, and is a means for determining the current application direction. The signal discriminators 62a and 62b discriminate whether the signal related to the current value (I) is positive or negative, and a discrimination signal is output from either one of the signal discriminators 62a and 62b. The signals output from the signal discrimination signals 62a and 62b are multiplied by a coefficient (+1 or −1) for code conversion set by the filters 63 and 64 in the next stage, and then the adders of the circuit units 41 and 42 65 and 66. The adders 65 and 66 add the voltage signal value output from the filters 63 and 64 and the output voltage value from the offset voltage source 69 that outputs a voltage of, for example, 1 volt. The voltage output from the adders 65 and 66 is input to the ON / OFF conversion element 68. Further, the signal output from the ON / OFF conversion element 68 is given to the base (gate) of the switch elements SW1 and SW2, and controls the on / off operation of the switch elements SW1 and SW2. The on / off operation of the switch elements SW1 and SW2 is controlled so that when either one is turned on, the other is turned off. As a result, the above-described regenerative current is generated. The circuit configurations of the circuit units 41 and 42 are not limited to the illustrated circuit configuration. The functions of the circuit units 41 and 42 are functions for switching the on / off operation of the switch elements SW1 and SW2 by looking at the energization direction of the input current to the current source 23. The circuit units 41 and 42 may adopt any circuit configuration as long as the circuit has the function.

  Based on the above, when an electric motor (three-phase synchronous motor) having a coil whose inductance component is variable is connected to a commercially available typical circuit simulator (PSIM), the equivalent of the electric motor according to the present embodiment The circuit model is created by creating a coil model of each phase on the basis of FIG. 4 and, in particular, by setting its inductance component (L) to the equivalent circuit shown in FIG. By making the equivalent circuit model of the electric motor as described above, even if the inductance component of the coil of each phase is variable, the motor analysis can be performed without any trouble using a commercially available circuit simulator.

  FIG. 12 shows an equivalent circuit presented to the user by a commercially available circuit simulator (PSIM). The user sets the usage environment in the equivalent circuit of FIG. 12 displayed on the screen of the display device. In the circuit simulator shown in FIG. 12, 71 is an equivalent circuit of the motor portion. The equivalent circuit 71 of this motor is constituted by the circuit shown in FIG. In the circuit simulator of FIG. 12, the circuit 72 is a bridge circuit that supplies the motor 71 with an on / off voltage for driving each phase of the motor.

  Next, FIGS. 13 to 16 show another embodiment of a circuit simulator according to the present invention. This circuit simulator is created based on commercially available software “Simulink (registered trademark)”.

  FIG. 13 shows an equivalent circuit model of each phase coil. In FIG. 13, 151U is a terminal, 112 is a resistance component, 113 is an induced voltage component, and 114 is an inductance component. The terminal 151U, the resistance component 112, the induced voltage component 113, and the inductance component 114 respectively correspond to the terminal 51U, the resistance component 12, the induced voltage component 13, and the inductance component 14 described in the above embodiment. The induced voltage component 113 is configured such that data relating to the induced voltage is given via the port 113a, the data relating to the induced voltage is stored in the memory 113b, and then given to the variable voltage source 113c. The inductance component 114 is given data related to the current value via the port 114a and is stored in the memory 114b. The memories 113b and 114b are time delay elements for transmitting nonlinear information between the circuit simulator and the coil model. In the inductance component 114, 121 corresponds to the current source 23, blocks 122 and 123 correspond to the energization paths 31 and 32, respectively, and blocks 124 and 125 correspond to the circuit units 41 and 42, respectively. Yes. The function of the current source 121 is the same as the function of the current source 23, the function of the energizing paths 122 and 123 is the same as the function of the energizing paths 31 and 32, and the function of the circuit units 124 and 125 is the same as that of the circuit units 41 and 42. Since it is the same as the function, detailed description is omitted. The port 126 is a port connected to a higher-order electric circuit.

  FIG. 14 shows an equivalent circuit of the electric motor. In the equivalent circuit of this electric motor, the coils 111U, 111V, 111W of each phase are configured by the equivalent circuit model shown in FIG. The other part of the equivalent circuit of the electric motor is created based on a circuit simulator “Simulink (registered trademark)”.

  FIG. 15 shows an equivalent circuit for applying a PWM waveform drive voltage to the electric motor having the equivalent circuit configuration of FIG. This circuit is also created based on the circuit simulator “Simulink (registered trademark)”.

  FIG. 16 shows an equivalent circuit of the entire control circuit related to the electric motor created based on the circuit simulator “Simulink (registered trademark)”. The overall configuration of the control circuit based on the circuit simulator “Simulink (registered trademark)” is well known.

  In the case of connecting an electric motor (three-phase synchronous motor) having a coil whose inductance component is variable in a commercially available circuit simulator (Simulink (registered trademark)), as in the case of the above-described embodiment, Even if the inductance component of the coil is variable, the motor analysis can be executed without any trouble using a commercially available circuit simulator.

  The configurations, shapes, sizes, and arrangement relationships described in the above embodiments are merely schematically shown to the extent that the present invention can be understood and implemented, and numerical values are merely examples. Therefore, the present invention is not limited to the described embodiments, and can be variously modified without departing from the scope of the technical idea shown in the claims.

  The present invention is used to cause a practical analysis without any trouble by the circuit simulator even if the conductance component of the coil is made variable by a commercially available circuit simulator used for the analysis of an electric motor or the like.

It is an equivalent circuit diagram of the electric motor in the circuit simulator which concerns on embodiment of this invention. It is an enlarged view of the equivalent circuit of the U phase coil part of the electric motor in this embodiment. It is a circuit diagram of the detailed equivalent circuit of the inductance component of a coil. It is a figure expressing the equivalent circuit of a coil. It is a figure which shows the inductance component of a coil. It is a figure which shows an example of the equivalent circuit of the inductance component of a coil. It is a figure explaining the problem of the equivalent circuit of the inductance component of the coil shown in FIG. It is a figure explaining the problem regarding the voltage relationship of the equivalent circuit of the inductance component of the coil shown in FIG. It is an equivalent circuit diagram of the inductance component of the U-phase coil of the electric motor for solving the problem demonstrated in FIG. FIG. 10 is an equivalent circuit diagram that makes the equivalent circuit of the inductance component shown in FIG. 9 more practical. It is a figure which shows the equivalent circuit of the inductance component of the coil which concerns on this embodiment. It is a circuit diagram which shows the example of whole structure of the circuit simulator which concerns on embodiment of this invention. It is the equivalent circuit schematic of the coil which concerns on other embodiment of this invention. It is an equivalent circuit schematic of the electric motor which concerns on other embodiment of this invention. It is an equivalent circuit diagram of the drive circuit which applies the drive voltage of a PWM waveform to the electric motor which concerns on other embodiment of this invention. It is an example of an equivalent circuit diagram which shows the whole circuit of the circuit simulator for electric motor analysis which concerns on other embodiment of this invention.

Explanation of symbols

11 U U-phase coil 11 V V-phase coil 11 W W-phase coil 12, 112 Resistance component 13, 113 Inductive voltage component 14 Inductance component 15 Constant voltage source 21 Voltage extractor 22 Current generator (means for generating an arbitrary non-linear current by database)
23,121 Current source (variable current source)
24 switch element 25 parallel resistor 26 resistor element 27 diode element 28 unidirectional energization path 29 regenerative current flow 31, 122 energization path 32, 123 energization path 41, 124 control circuit section 42, 125 for switching the energization path control for switching the energization path Circuit part 71 Motor part 72 Control bridge circuit for switching on / off 126, 151U Connection port with circuit simulator 113a Induced voltage input port 114a Current value input port from database 113b, 114b Memory (time delay element)

Claims (14)

A circuit simulator for analyzing the electrical device comprising a coil constituting a magnetic circuit,
The equivalent circuit portion of the coil in the circuit simulator is configured with an inductance component, and
The equivalent circuit portion of the inductance component includes a current source that outputs a current, a voltage extraction unit that extracts a voltage between terminals of the current source, and a current value of the current source based on a voltage value output from the voltage extraction unit. A circuit simulator comprising: a current generating means for determining a current path; and an energization path that is connected in parallel to the current source and allows a regenerative current to flow during an off operation . The energization path for flowing a regenerative current is composed of two sets of energization paths that are composed of a diode element, a resistance element, and a switch element and have opposite energization directions, and each of the two sets of energization paths during the off operation. circuit simulator according to claim 1, characterized in that it comprises a circuit portion for controlling in response to on-off operation of the switching element to the conduction direction. 3. The circuit simulator according to claim 1, wherein the current generation means is a database that receives an arbitrary physical quantity such as a voltage and expresses nonlinear electrical characteristics as an output current. Circuit simulator according to any one of claims 1 to 3, wherein the portion of the equivalent circuit of the coil comprising a further resistance component and the induced voltage component. In a computer, a method for creating a circuit simulator for analyzing an electric device including a coil constituting a magnetic circuit,
A first step in which an existing commercially available circuit simulator program is installed in the computer, and the circuit simulator is prepared to be operable on the computer;
The coil equivalent circuit creation means includes a current source that outputs a current as a part of the equivalent circuit of the coil that can be incorporated in the circuit simulator, a voltage extraction means that extracts a voltage between terminals of the current source, and this voltage extraction A coil with an inductance component, comprising: current generating means for determining a current value of the current source based on a voltage value output from the means; and an energization path connected in parallel to the current source and for allowing a regenerative current to flow during an off operation. A second step in which a portion of the equivalent circuit is created ;
In place of the part of the existing equivalent circuit of the coil that is pre-installed in the circuit simulator, the connection means is configured to connect the coil equivalent circuit by the inductance component generated in the second step with respect to the circuit simulator. A third step of connecting the parts and allowing the part of the coil equivalent circuit based on the inductance component to be incorporated into the existing commercially available circuit simulator without causing a vibration phenomenon during operation of the circuit simulator ;
A method for producing a circuit simulator, comprising: 6. The circuit simulator creation method according to claim 5, wherein a portion of the coil equivalent circuit based on the inductance component is further expressed to include a resistance component and an induced voltage component. A program for causing a computer to execute a circuit simulator for analyzing an electric device including a coil constituting a magnetic circuit,
In the computer,
The equivalent circuit of the coil in the circuit simulator is represented by an inductance component, and
An equivalent circuit of the inductance component, a current source that outputs a current, a voltage extraction unit that extracts a voltage between terminals of the current source, and a current value output from the current source based on a voltage value output from the voltage extraction unit A circuit simulator program characterized in that it is realized by a current generating means for determining a current path and an energization path that is connected in parallel to the current source and allows a regenerative current to flow during an OFF operation . The energization path for supplying a regenerative current to the computer is divided into two sets of energization paths each composed of a diode element, a resistance element, and a switch element and having opposite energization directions, and each of the two sets of energization paths during the off operation. The circuit simulator program according to claim 7 , wherein an on / off operation of the switching element is realized by a circuit unit that controls the switching element according to a direction of energization. 9. The circuit simulator program according to claim 7 or 8 , wherein said current generation means is realized by said database by a database that receives an arbitrary physical quantity such as a voltage and expresses a nonlinear electrical characteristic as an output current. Equivalent circuit of the coil are realized on the computer, the conjunction inductance component, program circuit simulator according to any one of claims 7-9, characterized in that it comprises a resistance component and the induced voltage component. A program for causing a computer to execute a circuit simulator for analyzing an electric device including a coil constituting a magnetic circuit,
In the computer,
The equivalent circuit of the coil in the circuit simulator is represented by an inductance component, and
An equivalent circuit of the inductance component, a current source that outputs a current, a voltage extraction unit that extracts a voltage between terminals of the current source, and a current value that the current source outputs based on a voltage value that the voltage extraction unit outputs A computer-readable program characterized by recording a circuit simulator program to be realized by a current generating means for determining the current and a current path that is connected in parallel to the current source and allows a regenerative current to flow during an off operation recoding media. The energization path for supplying a regenerative current to the computer is divided into two sets of energization paths each composed of a diode element, a resistance element, and a switch element and having opposite energization directions, and each of the two sets of energization paths during the off operation. 12. The computer-readable recording medium according to claim 11 , wherein a circuit simulator program for realizing the on / off operation of the switch element is realized by a circuit unit that controls the switching element in accordance with the energization direction. The computer, said current generating means inputs the arbitrary physical quantity such as a voltage, according to claim 11, characterized by recording a program circuit simulator for implementing the database to represent the non-linear electrical properties as the output current or 12, wherein the computer-readable recording medium. Equivalent circuit of the coil are realized on the computer, the conjunction inductance component according to any one of claims 11 to 13, characterized in that the program circuit simulator including resistance component and the induced voltage component recorded Computer-readable recording media.

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