Permanent Magnet Alternator load problem

[Mark]

Hi all,
I've made a simple permanent magnet alternator. For the sake of
experimentation I've attached the rotor to a D.C . motor, and the
motor to a constant voltage power supply. When I complete the circuit
with my wire coils, for some reason the current draw goes up and the
rpms go down on the rotor. This happens whether there is a load or no
load across the coils. The coils are in no way connected(intentionally
at least) to the rotor or motor. I don't know what is happening, or
how to prevent it. Any help would be appreciated.

Thanks,
Mark

 

[Tim Wescott]

Hi all,
I've made a simple permanent magnet alternator. For the sake of
experimentation I've attached the rotor to a D.C . motor, and the
motor to a constant voltage power supply. When I complete the circuit
with my wire coils, for some reason the current draw goes up and the
rpms go down on the rotor. This happens whether there is a load or no
load across the coils. The coils are in no way connected(intentionally
at least) to the rotor or motor. I don't know what is happening, or
how to prevent it. Any help would be appreciated.

Thanks,
Mark

Schematic? I'm not clear on what you're doing, although connecting the
motor in reverse would make an effective brake.

--
Tim Wescott
Control systems and communications consulting
http://www.wescottdesign.com

Need to learn how to apply control theory in your embedded system?
"Applied Control Theory for Embedded Systems" by Tim Wescott
Elsevier/Newnes, http://www.wescottdesign.com/actfes/actfes.html

 

[Tolstoy]

Hi all,
I've made a simple permanent magnet alternator. For the sake of
experimentation I've attached the rotor to a D.C . motor, and the
motor to a constant voltage power supply. When I complete the circuit
with my wire coils,

"Complete the circuit with my wire coils"
You completed some circuit that caused the coils to conduct. That of
course lugs the motor.
You didn't just short the alternator's output wires together, did
you? Sorry, I had to ask.
Anyway, the connection you made completed some circuit.
What kind of alternator did you build single phase or something
fancier?

 

[Mark]

Schematic? I'm not clear on what you're doing, although connecting the
motor in reverse would make an effective brake.

--
Tim Wescott
Control systems and communications consultinghttp://www.wescottdesign.com

Need to learn how to apply control theory in your embedded system?
"Applied Control Theory for Embedded Systems" by Tim Wescott
Elsevier/Newnes,http://www.wescottdesign.com/actfes/actfes.html

Hey guys,
Can I e-mail you a simple drawing of my setup to make things easier?
My e-mail is [email protected].
Thanks