Fuji ETN01-055 [4n31] Motor speed control?

[John L]

This transistor has the arrow pointing away from the base. I would like to make a motor speed controller for a 7.5hp 220ac 1ph motor and a separate one for a 3 hp 90v dc motor. The transistor rating is 200amps 550v. I have more than one transistor for these applications. Thanx John L

 

[john1]

Hi John L,

Well there are different types of control,
and of controllers.

If you just want to vary the speed that
might be easy enough.

If you want a controlled speed, that might
be more difficult.

I take it the 3HP 90volt DC motor has a commutator.
But what about the 7.5 HP 220 VAC Single Phase,
is this a Capacitor start?
Is it intended to run at a fixed speed?

John

 

[John L]

Hi John L,

Well there are different types of control,
and of controllers.

If you just want to vary the speed that
might be easy enough.

If you want a controlled speed, that might
be more difficult.

I take it the 3HP 90volt DC motor has a commutator.
But what about the 7.5 HP 220 VAC Single Phase,
is this a Capacitor start?
Is it intended to run at a fixed speed? The 7.5 is a capacitor start and it is intended to run at a constant speed. The dc motor is a permanant magnet one. I would like a variable speed for both of them I also have a dc motor with seperate field winding. I would have to look at the field winding to see what it is. John L

John

 

[kinjalgp]

Did you find any transistor of 200amps 550v? I guess no! Just imagine how much power dissipation will be there in normal BJT? Thats why at high power either MOSFETs or IGBTs are used.