During starting of LSPM, there are transient torque pulses which do not contribute to average torque produced but cause noise and vibration. Any suggestions in this regard or research article will be really appreciated. thanks
Hi Salman
I am no expert on this subject.
For what it is worth.
This paper suggest LPSM motor design to involve some tradeoffs
http://134.130.107.200/uploads/bibliotest/2009StoiaLineStart.pdf
Scanning this paper
https://www.motor-design.com/wp-content/uploads/2016/12/ias_2002_linestartstartingperformance.pdf
which states "For a single-phase permanent magnet motor, the proper selection of a capacitor to obtain a balanced stator voltage system will lead only to the minimisation toward zero of the stator asymmetry effect. The rotor asymmetry effect cannot be eliminated.", it appears to me that one must cope with certain types of characteristics when using this motor design.
If so, the effects from uneven motor operation requires avoidance of
- internal motor resonance, e.g. cage or rotor resonance.
- system (motor, coupling and consumer) torsion resonance
Uneven motor torque can be mechanically filtered using a flexible coupling where the associated torsion resonance must be designed. Such a coupling and analysis adds cost which must be balanced against LPSM advantages.
I do not know if this is possible but, as food for thought, if LPSM errors, Y, are linear wrt to input, X, i.e. where Y = H*X, one might be able to use so called inverse filtering, 1/H*H*X, to add a compensating input signal to the input excitation.
Sincerely
Claes
Thank you, sir for the article, and this paper does provide the direction for the reduction of vibration. However, i will need to do more analysis for my motor during the transient state torque components.
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