scholarly journals Optimal split ratio in small high speed PM machines considering both stator and rotor loss limitations

2019 ◽  
Vol 3 (1) ◽  
pp. 3-11 ◽  
Author(s):  
J. Ma ◽  
Z. Q. Zhu
Keyword(s):  
High Speed ◽  
Split Ratio ◽  
Rotor Loss

scholarly journals Reverse Thrust Aerodynamics of Variable Pitch Fans

2018 ◽  
Author(s):  
Tim S. Williams ◽  
Cesare A. Hall
Keyword(s):  
High Speed ◽  
Pressure Ratio ◽  
Test Case ◽  
Suction Surface ◽  
Flow Angle ◽  
Variable Pitch ◽  
Open Rotor ◽  
Weight Penalty ◽  
Reverse Thrust ◽  
Rotor Loss

Variable pitch fans are of interest for future low pressure ratio fan systems since they provide improved operability relative to fixed pitch fans. If they can also be re-pitched such that they generate sufficient reverse thrust they could eliminate the engine drag and weight penalty associated with bypass duct thrust reversers. This paper sets out to understand the details of the 3D fan stage flow field in reverse thrust operation. The study uses the Advanced Ducted Propulsor variable pitch fan test case, which has a design fan pressure ratio of 1.29. Comparison with spanwise probe measurements show that the computational approach is valid for examining the variation of loss and work in the rotor in forward thrust. The method is then extended to a reverse thrust configuration using an extended domain and appropriate boundary conditions. Computations, run at two rotor stagger settings, show that the spanwise variation in relative flow angle onto the rotor aligns poorly to the rotor inlet metal angle. This leads to two dominant rotor loss sources: one at the tip associated with positive incidence, and the second caused by negative incidence at lower span fractions. The second loss is reduced by opening the rotor stagger setting, and the first increases with rotor suction surface Mach number. The higher mass flow at more open rotor settings provide higher gross thrust, up to 49% of the forward take-off value, but is limited by the increased loss at high speed.

scholarly journals Investigation of Optimal Split Ratio for High-Speed Permanent-Magnet Brushless Machines

2018 ◽  
Vol 54 (11) ◽  
pp. 1-5 ◽  
Author(s):  
Y. Wang ◽  
J. H. Feng ◽  
S. Y. Guo ◽  
Y. F. Li ◽  
Z. C. Chen ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
High Speed ◽  
Split Ratio

Optimal split ratio for high speed induction machines

2010 ◽  
Author(s):  
David Gerada ◽  
Abdeslam Mebarki ◽  
Neil L. Brown ◽  
Chris Gerada
Keyword(s):  
High Speed ◽  
Induction Machines ◽  
Split Ratio

Multi-physics analysis and rotor loss optimization of high-speed magnetic suspension PM machine

2017 ◽  
Vol 25 (3) ◽  
pp. 680-688
Author(s):  
韩邦成 HAN Bang-Cheng ◽  
薛庆昊 XUE Qing-Hao ◽  
刘 旭 LIU Xu
Keyword(s):  
High Speed ◽  
Magnetic Suspension ◽  
Rotor Loss
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