localbroadcast
Member
Hello. I'm new to this forum, but old to electronics / electrical stuff.
I've been playing with the idea of turning a 3 phase AC induction motor into a generator. It would have a squirrel cage rotor, and a synchronous speed of 1800 RPM. From what I've read, in order to get this type of motor generating electricity, the rotor needs to be spun at above synchronous speed, and have the stator field excited externally, or by capacitors. This would result in a generator that only works in a very narrow speed range. That's not what I want. I want to generate good power at all speeds.
Here's the question. Would it be possible to attach the stator windings to a variable frequency inverter fed with external power, thus, making the synchronous speed adjustable? So lets say the machine is attached to a wind turbine spinning 25 RPM. The system would detect this rotor speed and would change the frequency of the stator field to be slightly under this, say 24 RMP, thus creating a slip of 1 RPM, causing the system to generate power?
It seems the only other option that closely resembles this is a doubly fed induction motor / generator.. but this would be more expensive, and 3 PH ac squirrel cage motors are very common.
Thanks for any input, I hope you guys understand the question.
I've been playing with the idea of turning a 3 phase AC induction motor into a generator. It would have a squirrel cage rotor, and a synchronous speed of 1800 RPM. From what I've read, in order to get this type of motor generating electricity, the rotor needs to be spun at above synchronous speed, and have the stator field excited externally, or by capacitors. This would result in a generator that only works in a very narrow speed range. That's not what I want. I want to generate good power at all speeds.
Here's the question. Would it be possible to attach the stator windings to a variable frequency inverter fed with external power, thus, making the synchronous speed adjustable? So lets say the machine is attached to a wind turbine spinning 25 RPM. The system would detect this rotor speed and would change the frequency of the stator field to be slightly under this, say 24 RMP, thus creating a slip of 1 RPM, causing the system to generate power?
It seems the only other option that closely resembles this is a doubly fed induction motor / generator.. but this would be more expensive, and 3 PH ac squirrel cage motors are very common.
Thanks for any input, I hope you guys understand the question.