# h bridge motor circuit on LT specie

I've been working on a project where i'm building a h bridge motor circuit i have easily spent 15 hours on it and have made extremely slow progress on it in the last 3 days. The project sheet is seen below and i'm still on task 1 heavily struggling on the dc sweep of the inductor. [

I will attach the circuit i have made on lt spice below

Every time i do a dc sweep these are the errors ( attach below) i keep getting i have no idea how to fix them i have no idea if it is something to do with my circuit.

• Not only I don't see any .STEP command in there (you're saying you need to sweep the values for L), I don't see any .DC card, either (there is a .TRAN). That's why the errors you are showing in the error log have nothing to do with the picture of the schematic. To top all that, your schematic is so mingled, it's unreadable. There are many strange decisions in there so, rather than address them all, take a look at this answer for a reference on how to build your bridge. You can take it from there. Mar 15 '21 at 7:33

• No need for diodes, the transistors have builtin, but since this is a test case you can use VCSW instead of MOSFETs (see the link in the comment). That way there's no need for vhigh in A1, the VCSW .model will take care of it. If you used parasitics, use them in full: add Cpar besides Rser in the sources, no need for external caps (and two in parallel is just visual). While you're at it, for a more convergent friendly way: no BV, no V_sense, instead add a CCCS across R1 with L1 {value/R_motor} (careful about the polarity). Also no need for Ncycles in V1. Mar 15 '21 at 10:09