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Hi Dave,
"I always wanted to try a pi / 2 ratio between two different pulse trains on a motor.I don't know if you can pulse the stator and rotor separatly to achieve this,..."
Nikola Tesla in one of his patents describes how to run a motor on two different frequencies: https://teslauniverse.com/nikola-tesla/patents/us-patent-390721-dynamo-electric-machine https://teslauniverse.com/nikola-tesla/patents/us-patent-390721-dynamo-electric-machine
By vibration resonance do you mean mechanical resonance? For a complete AC oscillation (one cycle) energy or power has double the exciting frequency. I.e. magnetizing first in one direction followed by magnetization in the opposite direction. If the mechanical resonance is double that of the AC frequency it will resonate at double the AC frequency. Think of it as the hum of mains power transformers (magnetostriction of iron in transformers). If the mechanical resonant frequency is at this frequency and coupled to it it will resonate (or vibrate) at this frequency.
Regards
Ole
---In [email protected], <libra_spirit@...> wrote :
Hi All - Question
Has any one here used pulse modulations on the motors you are playing with?
I always wanted to try a pi / 2 ratio between two different pulse trains on a motor.
I don't know if you can pulse the stator and rotor separatly to achieve this, but you would need two different frequencies to mix in order to set up a self sustaining form of vibraiton on the motor.
The vibration energy is contained in the direction of motion vector, and is not per say electrical, although it can come from electrical modulation at 90 degrees to both.
With an AC field however the field is in rotation.
Also wanted to point out that I have observed in my experiments, vibration resonance has nothing to do with EM resonance althrough they can be coupled at 2 times the AC waves frequency.
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We can also set up an 89 / 50 vibration ratio around a spinning mass to lower it's resistance to acceleration.
That is a ratio a bit larger then pi / 2.
Pi / 2 = 1.5707963 ...
89 / 50 = 1.78
Thanks all for reading,
Dave L