How can i setup regenerative braking on an AC motor?
I'm pretty sure that the answer to that would not fit in this space. That would be more like a textbook sized answer. You are going to need a sophisticated motor controller—something along the lines of the controllers that are used for servo motors in industrial and robotics applications, except that your controller will need to integrate all of the features of a standard servo motor controller with all of the features of a high-performance battery charging system. If you'd said DC instead of AC, then a short and crude answer would be possible. You can demonstrate DC regenerative braking with a motor that is hooked to a battery through a simple switch that reverses the polarity. If the vehicle is moving along with the switch set to the forward position, and then you suddenly throw the switch to reverse, then the motor will start to apply torque in the opposite direction, slowing the vehicle down, and at the same time, forcing the current in the circuit to flow in the opposite direction—recharging the battery. The same principle applies with a brushless AC motor, except that there's a whole issue of timing and waveforms that must be carefully synchronized with the motor shaft position at all times in order to apply smooth torque in the desired direction.
electric powered locomotives can feed their braking ability lower back into the overhead wires (as long as there is yet another prepare interior the device to consume the potential). In a diesel-electric powered locomotive you do not have everywhere to place the extra potential (different than slightly for prepare heating/air-conditioning on passenger trains), so which you in lots of instances warmth up resistor banks with the electrical powered ability from the vehicles, even however this permits you to't re-use the potential. you may fee a battery and use that ability lower back to strengthen up the prepare later, then you rather had a hybrid locomotive, i've got self assurance they are sorting out that for the period of a few shunters yet there's no great scale application yet. yet another a danger answer for short term potential storage could be flywheels. In a diesel-hydraulic engine you will have a retarder (to boot to friction brakes) which will warmth up oil while braking.
