Amitabh Saraf, ADA on FCS
- elector hydrostatic actuator =eha
- ema have higher bandwidth
- magnetic gear unit have inherent torque limiter function, non contact torque transmission
- Geared GMR position sensors are v good
- 16 kW power required to make all fcs actuators in rta as electric
- RCI, NFTDC, VSSC make BLDC electric motors
- CPRI makes power drive electronics
Sudharshan Kaarthik , IIST on motor
- Marathon motors and remy motors are common
- best for aviation = PMSM with additional reluctance torque, also called PMAC motor, rotor gets heated, problem is how to cool.
- Total torque is composed or magnet torque and reluctance torque
- Brusa electronik 156 kW, 305Nm torque, PM assisted syn reluctance motor is suitable.
- Magnets in the slot reduces the flux path area but increases the magnet torque. Should compromise
- Disk like motor are axial flux syn rm, high torque because of increased number of poles
- motor controllers
- unitek bamocar d3
- hbc 400400
- sd100
- pm100
- axiom 100+kW
- yuneec
- wright electric - 2MW continuous power , 1000V DC bus
- Hansa needs axial flux, pm assisten syn reluctance motor, 100kW, 20A, 500V DC link
- Use silicon carbide switches compared to only silicon. SiC switches have good part load performance. Partload efficiency important when designing with TO power and using at cruise power
- multphase machines reduce current per phase and give smooth torque
- redundancy is good if one coils fail
- SiC have 10 times breakdown electric field strength of Si
- Lq/Ld=9 is the most important design parameter of the motor
- field oriented control should be used as it does independent control of torque and flux
- need to model slot harmonics, torque ripple and cogging torque
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