3 phase joining in series, possible?

AI Thread Summary
Connecting two outputs of a three-phase system in series to increase voltage is not feasible, as the phases are interconnected at the neutral point. Attempting to do so would result in a short circuit, similar to improperly wiring batteries in series. While the voltage between phases is 1.73 times the individual phase voltage, this does not provide a viable solution for increasing voltage. It is advised that individuals unfamiliar with three-phase circuits refrain from attempting any connections. Understanding the complexities of three-phase systems is crucial for safe operation.
Oxieee
Messages
8
Reaction score
0
3 phase joining in series, possible??

Hello good people.

I need to run a brushless motor on an esc but the equivalent speed controller is three times the price of motor.

I was wondering if it is possible to connect TWO output 3 phase current in series in an effort to stack up the voltage together.

Thanx alot...have no idea about 3 phase currents :P:P:P
 
Engineering news on Phys.org


cant understand your query ...
 


No, you can't connect the phases of a 3 phase supply in series because they are joined at the neutral.

Take this example with batteries,

[PLAIN]http://dl.dropbox.com/u/4222062/Batteries%20in%20series.PNG

The negative terminals of the batteries are joined together (with the black wire at the bottom), and to connect them in series would mean connecting the red wire as shown.

This would short out the left battery.

This is similar to the situation with 3 phase circuits.

However, the voltage between phases of a 3 phase system is 1.73 times the individual phase voltage and this isn't much less than twice the phase voltage.

If you have no idea about 3 phase circuits, you should definitely not be connecting anything to them.
 
Last edited by a moderator:
Very basic question. Consider a 3-terminal device with terminals say A,B,C. Kirchhoff Current Law (KCL) and Kirchhoff Voltage Law (KVL) establish two relationships between the 3 currents entering the terminals and the 3 terminal's voltage pairs respectively. So we have 2 equations in 6 unknowns. To proceed further we need two more (independent) equations in order to solve the circuit the 3-terminal device is connected to (basically one treats such a device as an unbalanced two-port...
suppose you have two capacitors with a 0.1 Farad value and 12 VDC rating. label these as A and B. label the terminals of each as 1 and 2. you also have a voltmeter with a 40 volt linear range for DC. you also have a 9 volt DC power supply fed by mains. you charge each capacitor to 9 volts with terminal 1 being - (negative) and terminal 2 being + (positive). you connect the voltmeter to terminal A2 and to terminal B1. does it read any voltage? can - of one capacitor discharge + of the...
Back
Top