Let's take a few simple calculation about drive AC motor from battery:
1.If we use a battery source (12 or 24 V), to obtain 310V@1000W:
Secondary current = 1000/310 ~3.5A
Primary current = 1000/24~41,6A -> this is very serious converter -> have a price more then 2000$!
2.AC motor is driven from vector or frequency source and second step is to design a power stage, to control the motor.
If we choose a voltage/frequency control of induction motor, the price of converter will be smaller then same vector control unit,but control performance of drive is poor (bad respond of dynamic torque).In other way, if we start to design a vector control, the performance of drive system will be excellent but system stay more complicated.
3.When start to design vector control system we have some pure mathematic operations:
-Clark/Park forward and inverse calculation;
-α-β -> d-q forward and inverse calculation;
- PI (or PID) loop calc.
- dynamic motor model calc to obtain torque and flux, compare with ref. values
-SVM calc
All operations take a time-> we needs of high speed F.P controller with fast ADC and capture modules.Time for calculation can be decreased if we use a space-state method and all equations are decided in matrix form.
4.Have much underwater stones when start to design a system in practice
In my opinion,price of system,which supply and control motor from battery is much expencive.dsPIC is not suitable decision for that system because is low speed and have a small memory.