[SOLVED] speed control of dc motor

[fareen]

View attachment pwmstart.rar
this is a circuit
the work is to drive a dc motor with help of h bridge but we need to install deadtime.
plz take a look and some help will be greatly appreciated
problem im facing with a inductive load and output is not what is required its quite bizarre

 

[goldsmith]

Dear fareen
Hi
Is your problem , creating dead time , really ? if yes , your solution is simple . use an schmitt trigger not gate and an RCD network , simply .
and about your circuit , i think you'd better to use just Nmosfets and then using a driver IC e.g IR2113 or 2110 or 2130 or ....etc
Best Wishes
Goldsmith

 

[FvM]

Did you notice the "incredible" slow risetime of gate signals and the fact that MM6 is permanently on? In a real design, the MOSFETs would be damaged by a gate voltage above maximum ratings.

The intention of the circuit isn't clear. If it's only a functional simulation, you can use ideal SPICE elements as gate drivers. If the simulation purpose is evaluation of a real design, you should use sufficient low impedance push-pull gate drivers and observe the maximum ratings.