AC Permenent Magnet Motor

[Low-Q]

50 amps, not 5. It is a fast plane - 750W motor. I must use 100 amp regulator on my biggest 3D plane. 2kw motor.

[wings]

Hi wings,

thanks for looking at this topic and posting a link to a Synchronous motor explanation. I had also done some searching before starting this topic and also found Synchronous motors to be close!... however, if you read the description it say the rotor has brushes.

"Synchronous motor is like an induction motor except the rotor is excited by a DC field. Slip rings and brushes are used to conduct current to rotor."

Thanks for sharing

Luc

like this:

http://www.allaboutcircuits.com/vol_2/chpt_10/4.html

[jadaro2600]

Hi jadaro2600,

I understand now!... thanks for the explanation.

The motor works with sine wave but since my SG output is limited I was using square wave since it has more energy and made a better show for the video.

I think ideally sine wave should be used.

Luc

Well, the type of wave actually flowing through tyhe circuit will vary due to the magnet spinning in it.

The square wave is on in one direction then on in the other suddenly.  There is no smoothness to it, so you may be right, however, there may be a series of waves which may better benefit the motion of the rotor.

One can use a sound card to produce constructive waveforms ...for instance,  mixing 12hz with 13hz will create another beat in the sine waves.  Sound cards can also be used to generate square waves as well, it just depends on the generator.

This is, however limited to the output high frequency of the sound card.. 48khz or 96khz for higher end.

You will also need an analog 'receiver' amplifier to power it.

...this may be an unusual way of doing things ...  but the motion of the permanent magnet rotor will cause it's own effects in the vicinity of the coils, this effect could be monitored as feedback.

For example: consider microphone feedback.

You may be able to tune in to the coil's noise and create a functional, constructive feedback which will compound the effects you are seeing.

[gotoluc]

like this:

http://www.allaboutcircuits.com/vol_2/chpt_10/4.html

Thanks for this good link wings

I think these motors also have laminate steel cores with the coils wrapped around them.

Thanks for sharing

Luc

[gotoluc]

Well, the type of wave actually flowing through tyhe circuit will vary due to the magnet spinning in it.

The square wave is on in one direction then on in the other suddenly.  There is no smoothness to it, so you may be right, however, there may be a series of waves which may better benefit the motion of the rotor.

One can use a sound card to produce constructive waveforms ...for instance,  mixing 12hz with 13hz will create another beat in the sine waves.  Sound cards can also be used to generate square waves as well, it just depends on the generator.

This is, however limited to the output high frequency of the sound card.. 48khz or 96khz for higher end.

You will also need an analog 'receiver' amplifier to power it.

...this may be an unusual way of doing things ...  but the motion of the permanent magnet rotor will cause it's own effects in the vicinity of the coils, this effect could be monitored as feedback.

For example: consider microphone feedback.

You may be able to tune in to the coil's noise and create a functional, constructive feedback which will compound the effects you are seeing.

Hi jadaro2600,

So many things to do and try ... it's all good stuff!

Thanks for sharing

Luc