how to create spice model

[sinaku08]

how to create spice model (.SP3 FORMAT ) for LT SPICE SIMULATION SOFTWARE. I need to create different spice models for different electronic components.

any one PLEASE tell me what are the formats supported by the LT SPICE SOFTWARE.

any other software is there for creating spice models which are supported by LT SPICE SIMULATIO SOFTWARE.

 

[sky_123]

Its just a text format, you can use Notepad to create it. You can copy-and-paste from device datasheets.

 

[Baas Rietrot]

You can also use the symbols available in LT SPICE to give your newly created MODEL a symbol if the device you import is a BJT or something, or just draw one.

 

[sinaku08]

what are the parameters

thankyou sky_123, what are the paremeters(considerations from the datasheet) need to assign to the notepad .model list for different electronic components.if any material (pdf) is available in the internet plz send me the link so that I can download and follow. Is there any possibility to simulate dc motors and alternators?

 

[sky_123]

Normally manufacturers of parts publish an entire SPICE file, so you don't need to extract parameters. This applies to devices like transistors, op-amps, etc.
Maybe motor manufacturers don't feel the need to do this, since usually a motor may be driven by relay and the major parameters are voltage and current, and you know it contains a coil, so you could simulate that at a very high level with just a resistor and an inductor. You could just look at an existing SPICE model for a motor, and guess what the parameters are (it is fairly intuitive, it uses node numbers and component names/values). For example by observing the built-in model in Multisim you can see that is an inductor
(1mH) and a resistor (2 ohm) in series. If you wanted to create your own from scratch and not copy an existing model, then you'd
need to understand the SPICE format and what the contents mean.**broken link removed** contains details of the circuit elements (components) and
the syntax. **broken link removed**tells you the overall outline of the file contents. I think it is easier to understand if you just look at some existing SPICE models in your simulator first, to get an idea of the content.