Controller circuit for Hilden Brandt motor needed..

[wattsup]

@Jack and @Honk

Sorry to learn of your set-back.

While you wait for the next controller, consider doing your tests with standard rheostat-AC-rectified. Just to see if the motor is putting out good torque versus watts. This would also at least give you some answers on start up current draw. You never know. Just in torque alone it could show OU.

Is it possible to put a few large high voltage caps in there with diodes to see if you can capture any high voltage spikes. This would also be usefull for Honk. If after you run the motor you check voltage on the caps and you see 1200 volts or more, there is really something happening in the motor.

I also think that it would have been a good idea to put two or three taps on the main coil, let's say every 200 winds. This would enable you to test driving the motor at different wind lengths since if there is too much coil versus required energy to saturate the core and turn the rotor, you may get much higher flyback then anticipated.

All the best to both of you in 2008.

[JackH]

Thanks,,,,,,,JackH

[Thaelin]

  @ Honk:
      Hey, was just reading the specs on the motor and what I can tell this coil is capable of drawing 25 amps. Not saying it does but thats how ohms law relates to the equation. E=IR would work out to e=150 and R=6 and E/R makes I=25 and thats if it was constantly on. Since its pulsed it will draw quite a bit less but .....
       Am I on the wrong track here?

thaelin

[Honk]

It doesn't matter in this case because the controller is current limited to 2.5 amps.
And you cannot apply resistive calculations onto the motor coils unless the the motor is totaly stalled by overload.
In this case 2.5 amps could flow through one of the coils due to the output current limitation.
There's three phases in this motor but only one phase at the time will conduct. It's not possible for all coils to conduct simultaneously.

[Liberty]

Honk and Jack,

This is just something to think about and some info that might help you guys out.
With a limit of 2.5A from your controller, Jack might be able to rewind his motor coil using #22 wire instead of #15.  If the coil used the same amount of length of wire, the wire would have a resistance of about 30.56 ohms.  (Using a straight 150vdc on this resistance could draw up to 4.91A at startup or stall).  Jack would no doubt have to re-figure what size coil in #22 wire @ 2.5A limit, would make a strong enough magnetic field to work in his motor.  This might better match your controller and help his motor to use less power input as well.  (Unless you want the larger wire size for generating power within the motor).

Info:  Bare #15 wire is good for up to 15.5A
        Bare #22 wire is good for up to 3.04A

Resistance per foot:  #15=.003181 ohms per foot
                               #22=.016202 ohms per foot 

Coil wire length estimate is:  1886.19 feet @ 6 ohms for #15 wire

Best wishes to both of you Honk and Jack.