Dear all,
I'm doing my project in university. My project is to replace a DC
drive by a AC drive using inverter.
The old DC drive parameters are:
- Power 450kW
- Speed 50 to 1000r/min
(so Tn = 4298Nm) (Tn: nominal torque)
and the requirements are 250 %% during 60 seconds acceleration and a
periodical overload of 160 percent during 30 seconds. That means I
need a starting torque is 250%% nominal torque during 60 seconds.
(Ts = 2.5*Ts = 10745Nm)(Ts: starting torque)
Now I need to select an asynchronous motor to satisfy these
requirements but the problems are:
- The starting torque of AC motor is lesser than DC motor so I must
select a AC motor with larger power
AC motor : Ts = (1.5-2.5)Tn
So I must select AC motor power larger than DC motor to satisfy the
starting requirement.
I selected : P(AC motor) = 1.5 * P(DC motor) =675kW
So in AC drive I have: ...

Dear all,
I'm doing my project in university. My project is to replace a DC
drive by a AC drive using inverter.
The old DC drive parameters are:
- Power 450kW
- Speed 50 to 1000r/min
(so Tn = 4298Nm) (Tn: nominal torque)
and the requirements are 250 %% during 60 seconds acceleration and a
periodical overload of 160 percent during 30 seconds. That means I
need a starting torque is 250%% nominal torque during 60 seconds.
(Ts = 2.5*Ts = 10745Nm)(Ts: starting torque)
Now I need to select an asynchronous motor to satisfy these
requirements but the problems are:
- The starting torque of AC motor is lesser than DC motor so I must
select a AC motor with larger power
AC motor : Ts = (1.5-2.5)Tn
So I must select AC motor power larger than DC motor to satisfy the
starting requirement.
I selected : P(AC motor) = 1.5 * P(DC motor) =675kW
So in AC drive I have: ...

Hello!

I have one small SMPS which don't have IC, controll IC is uPC1042, I can't
find it anywhere. Friend did tell me that are some same IC's only from
different manufacture and in different name. If someone have any information
on this please let me know, or if someone have this IC maybee??

Thanks!!!!

Marin