Hi everyone,
I have finished building my eddy current loading brake. I also finished wiring a 115VAC-10VAC xformer, bridge rectifier and 65,000uF cap as my power supply to feed my Keppe motor. Monitoring the VAC into the bridge and large cap provides an accurate reading of the input power to my Keppe motor.
Under load and with best timing there is nearly NO sparking or arcing at the reed switch ! !
The motor is running at 960 (or so) RPM.
I have adjusted the timing of my Keppe motor for best power under load. I have not received my digital scale I will use to measure torque but I'll post what I have now.
Enjoy,
Greg
Here are the pictures:
This picture shows the eddy current brake used to load the Keppe motor. As the magnet on the screw moves closer to the spinning aluminum disc, the motor gets loaded.
This picture shows the timing adjustment used to produce best power under load. Notice the spikes going MOSTLY negative
This picture shows a large volume of negative going spikes at the beginning of the stator coil oscillation.
The next picture shows the stable AC power at 12.46V-RMS feeding the bridge and cap. It is nearly perfect sine wave ... suitable for computing input power.
The next picture shows the transformer, bridge rectifier, cap and back of my Keppe motor.
This last picture is the current my Keppe motor is drawing while running at 960 RPM under load and producing the above scope captures.
I have finished building my eddy current loading brake. I also finished wiring a 115VAC-10VAC xformer, bridge rectifier and 65,000uF cap as my power supply to feed my Keppe motor. Monitoring the VAC into the bridge and large cap provides an accurate reading of the input power to my Keppe motor.
Under load and with best timing there is nearly NO sparking or arcing at the reed switch ! !
The motor is running at 960 (or so) RPM.
I have adjusted the timing of my Keppe motor for best power under load. I have not received my digital scale I will use to measure torque but I'll post what I have now.
Enjoy,
Greg
Here are the pictures:
This picture shows the eddy current brake used to load the Keppe motor. As the magnet on the screw moves closer to the spinning aluminum disc, the motor gets loaded.
This picture shows the timing adjustment used to produce best power under load. Notice the spikes going MOSTLY negative
This picture shows a large volume of negative going spikes at the beginning of the stator coil oscillation.
The next picture shows the stable AC power at 12.46V-RMS feeding the bridge and cap. It is nearly perfect sine wave ... suitable for computing input power.
The next picture shows the transformer, bridge rectifier, cap and back of my Keppe motor.
This last picture is the current my Keppe motor is drawing while running at 960 RPM under load and producing the above scope captures.