Equivalent circuit for coil incorporated in circuit simulator, circuit simulator and method of preparation of same, and storage medium of circuit simulator program

A computer-readable storage medium storing a program for executing a circuit simulator on a computer, said program comprising instructions causing the computer to execute the circuit simulator by:

• modeling electrical equipment in said circuit simulator, the electrical equipment including a coil as an electrical circuit element;
• and
• modeling said coil with an equivalent circuit by an inductance component,
• wherein said inductance component comprises:
• a current source,
• voltage extracting means that extracts a voltage across terminals of said current source,
• current generating means that determines a current value of said current source depending upon said extracted voltage value extracted by said extracting means, said extracted voltage value to be input to said current generating means fluctuating in calculation, and
• a current-carrying path connected in parallel with said current source for eliminating fluctuations in said extracted voltage value by passing a regenerative current at a time that an application voltage to said coil is turned off,
• wherein said program is stored so that said inductance component is arranged as a variable without causing fluctuations through said current-carrying path.

A system for modeling a circuit, the system comprising:

• a circuit simulator program stored on a computer-readable storage medium, and
• a computer,
• the circuit simulator program comprising instructions causing the computer to execute the circuit simulator program by preparing an electrical equivalent circuit as an analytic model for analyzing electrical equipment including a coil as an electrical circuit element by analyzing an operation of said electrical equipment by use of said electrical equivalent circuit concerning said analytic model, wherein
• inductance components expressed by said equivalent circuit comprise:
• a current source,
• a voltage extracting means for extracting voltage across terminals of said current source,
• a current generating means for determining a value of the current of said current source based on the value of said extracted voltage extracted from said voltage extracting means, said extracted voltage value to be input to said current generating means fluctuating in calculation, and
• a resistance element connected in parallel with said current source for attenuating fluctuations in said extracted voltage value at a time that an application voltage to said coil is turned off, and
• a switch element for making said current source effective on said equivalent circuit during an off state and ineffective during an on state,
• wherein, in an event that a non-current-carrying state occurs in said coil, said current source is separated from said equivalent circuit by placing said switch element in the on state.

A computer-readable storage medium storing a circuit simulator program executed on a computer, the program comprising instructions causing the computer to execute the circuit simulator by:

• preparing an electrical equivalent circuit as an analytic model for analyzing electrical equipment including a coil as an electrical circuit element, said electrical equipment being a model of an electric motor or generator including three coils;
• and
• analyzing an operation of said electrical equipment by use of said electrical equivalent circuit;
• and
• modeling separate equivalent circuits for each of said three coils by inductance components;
• modeling said inductance components including operating an apparatus that comprises:
• a current source outputting a current,
• a voltage extracting means for extracting a voltage across terminals of said current source,
• a current generating means for determining the value of the current output by said current source based on the extracted voltage extracted by said voltage extracting means, said extracted voltage value to be input to said current generating means fluctuates in calculation, and
• a resistance element connected in parallel with said current source for attenuating fluctuations in said extracted voltage value at a time that an application voltage to said coil is turned off, and
• a switch element for making said current source effective on said equivalent circuit during an off state and ineffective during an on state.