On Tue, 2011-01-25 at 16:13 +0000, andy pugh wrote: > On 25 January 2011 13:44, jros <j...@unavarra.es> wrote: > > > I can see you've be seriously dealing with the internals of PMSM, and I > > would like to discuss a little bit about the subject,as I'm facing some > > problems related to torque rippling issue. > > Are you driving the motor with trapezoidal or sinusoidal waveforms?
I inherited the motors so I'm not sure, and the manual does not states. The motor has a resolver, and the driver is able to make position control, so I though that it uses sinusoidal or vector control. I was thinking my problems where more related t the quality of the drive, but, I'm thinking now that the drive can also play a role in the observed vibrations. > Here is a comparison (using EMC2 and a Mesa 7i39), Needs sound. > http://www.youtube.com/watch?v=47y6RgAK--8 > Very interesting, I have to listen to it to feel the difference, but certainly it's noticeable. The noise have some resemblances with the one that I have. In any case, even if sinusoidal control helps a lot, there is still some noise, so may be your drives have also torque rippling and/or cogging. A interesting observation is that the noise in both cases is different when going down and up. I'm having also the same behavior. I think that it can be related to friction in th screws, the dry contribution, should be bigger when going up, and it can induce nonlinear limit cycles. Thanks a lot!, Javier ------------------------------------------------------------------------------ Special Offer-- Download ArcSight Logger for FREE (a $49 USD value)! Finally, a world-class log management solution at an even better price-free! Download using promo code Free_Logger_4_Dev2Dev. Offer expires February 28th, so secure your free ArcSight Logger TODAY! http://p.sf.net/sfu/arcsight-sfd2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
