Control and dynamics of constant-power-loss-based operation ofpermanent-magnet synchronous motor drive system
Monajemy, R.; Krishnan, R.
Industrial Electronics, IEEE Transactions on
Volume 48, Issue 4, Aug 2001 Page(s):839 - 844
Digital Object Identifier 10.1109/41.937417
Summary:The operational envelope of electrical machines is limited by the
maximum permissible power loss of the machine at any given speed. The
control and dynamics of the permanent-magnet synchronous motor (PMSM)
drive operating with a maximum power loss versus speed profile is
proposed in this paper. The proposed operational strategy is modeled and
analyzed. Its comparison to the conventional strategy of limiting
current and power to rated values demonstrates the superiority of the
proposed scheme. The implementation of the proposed strategy is
developed. It is achieved with an outer power loss feedback control
loop. This has the advantage of retrofitting the present PMSM drives
with the least amount of software/hardware effort. The PMSM drives in
this case then can use the existing controllers to implement any torque
control criteria, such as constant torque angle, unity power factor,
constant air-gap flux linkages, maximum torque per unit current, or
maximum-efficiency operation. Experimental verification of the new
operational strategy is provided. The concepts presented in this paper
can be applied to all other types of motor drives
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