Need information about this Motor ?

[skimask]

The 2 extra wires actually connect directly to the Turbo-Encabulator...

[iugmoh]

I have this question ?
Is't possible to run a series wound motor as separately excited or shunt excited motor ? by applying for example a dc voltage on field coil to be separatley excited , or it's designing to work for specific type ?

[mackrackit]

I do not think it would run. Something tells me that if it would run, you would not have much power.

Map out the coils, a certain type from different manufactures may be able to be modified differently.

Sorry for the vague answer.

[iugmoh]

return back after I run the motor on, by convert it from series to separately excited by applying about 1.5V to it's Rf and variable voltage at Ra and it's working well.

now I build a driver for a gate of MOSFET from 5V to 12V and generate PWM to this driver to control the speed of motor by changing the voltage at Ra. the mosfet driver will switching 110 Volt to Ra, when I applied 12V or 24V no problem but when I applied 110V to MOSFET(IRF640) It's damaged and it's the second one I don't know why since this mosfet is capable to handle 200V , 18A.
So I need to make 110V driver can handle this voltage and current , anyone can helo me ? I attached the schematic

[aratti]

Remove the zener diode (D3). It will limit the gate voltage to 9.1 volts not enough for the mosfet total conduction.
It is the case to use a flyback diode across the motor

Al.

[mister_e]

Why do complicated while life could be way easier... if the goal is just to drive motor(inductive load) with PWM, the above circuit have few problem indeed. I would never use a Mosfet without a MOSFET driver IC, or without any Push-Pull setup... at least for high current load...

Still doable to use Logic level Mosfet directly connected to the PIC.

[iugmoh]

Thanks aratti and mister for your replies, I remove the zener after it's damaged and I'm putting the flyback diode , I know that IC drivers is better than I make a driver alone , but in our country It's a big problem to get IC's from any country because there are problems in ports and transportation.
Is there a professional circuit for mosfet gate driver and driver for mosfet handling 110V and 3A please help !