Low-cost ferrite permanent magnet assisted synchronous reluctance rotor and permanent magnet synchronous rotor with flux concentrator an alternative for rare earth permanent magnet synchronous motors

2014 ◽  
Author(s):  
S. Musuroi ◽  
C. Sorandaru ◽  
M. Greconici ◽  
V.N. Olarescu ◽  
M. Weinman
Keyword(s):  
Rare Earth ◽  
Permanent Magnet ◽  
Low Cost ◽  
Permanent Magnet Synchronous Motors ◽  
Synchronous Motors ◽  
Flux Concentrator

scholarly journals Design of Low-Cost Synchronous Machine to Prevent Demagnetization

Energies ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3566
Author(s):  
Claudio Bianchini ◽  
Ambra Torreggiani ◽  
Matteo Davoli ◽  
Alberto Bellini
Keyword(s):  
High Temperature ◽  
Permanent Magnet ◽  
High Efficiency ◽  
Induction Motors ◽  
Low Cost ◽  
Reference Surface ◽  
Permanent Magnet Synchronous Motors ◽  
Synchronous Motors ◽  
Additional Losses ◽  
Current Ripple

The request for high efficiency motor paves the way for the replacement of induction motors with permanent magnet synchronous motors. Although the efficiency is increased, for medium and high power, the current ripple causes significant additional losses in the magnet and lamination; and, high temperature can lead to demagnetization. In this paper, a new rotor topology is proposed and compared to a traditional surface permanent magnet rotor to reduce the magnet losses and protect them from demagnetization. A reference surface permanent magnet machine is compared with the proposed one in terms of performance and magnet losses. Both analytical and experimental analysis are carried out and discussed.

Influence of unbalanced magnetic force on shaft deflection in permanent magnet synchronous motor with fractional slot concentrated windings

2020 ◽  
Vol 64 (1-4) ◽  
pp. 1461-1468
Author(s):  
Ting Dong ◽  
Juyan Huang ◽  
Bing Peng ◽  
Ling Jian
Keyword(s):  
Permanent Magnet ◽  
Magnetic Force ◽  
Permanent Magnet Synchronous Motor ◽  
Operational Reliability ◽  
Topology Structure ◽  
Permanent Magnet Synchronous Motors ◽  
Synchronous Motors ◽  
Shaft Deflection ◽  
Large Length ◽  
Fractional Slot

The calculation accuracy of unbalanced magnetic forces (UMF) is very important to the design of rotor length, because it will effect the shaft deflection. But in some permanent magnet synchronous motors (PMSMs) with fractional slot concentrated windings (FSCW), the UMF caused by asymmetrical stator topology structure is not considered in the existing deflection calculation, which is very fatal for the operational reliability, especially for the PMSMs with the large length-diameter ratio, such as submersible PMSMs. Therefore, the part of UMF in the asymmetrical stator topology structure PMSMs caused by the choice of pole-slot combinations is analysized in this paper, and a more accurate rotor deflection calculation method is also proposed.

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