SL,
Nice work and thanks for sharing this!!!
I have a question regarding your flat top current waveforms on the rotor coils. How did you achieve this?
Regards,
Pm
PM,
Sorry for the delay in answering your ? Got "wrapped-around-the-axle" trying to optimize
the brass-board before it becomes a physically machined fabrication - measure twice; cut once!
For simulations the "flat top current waveforms" are set in the CAE software. You can tell it
to input any waveform you require through a "create your wavform" graphics dialogue box.
All three CAE programs [CST, SW-EMS, AEDT] use nearly the same scheme for a direct coil
excitation signal.
For the partial bench tests (very brief) a couple of dual channel Juntek JDS-2900 Signal Generators (FG's)
drive TI (Texas Instruments) UCC21530EVM-286 Evaluation Modules (a SiC MOSFET driver board) which
in turn drives the Littlefuse SiC FETs (Silicone Carbide high speed, high voltage) which, in turn, feed the coils.
The JDS-2900 is quite versatile so various input signal combinations can be easily tried. Programmable Logic
Inputs from the Digilent Analog Discovery2 instrument also works well but it's logic level pulses only.
When time permits, a proper microprocessor based (STM32 series demo board with display) driver scheme
will be designed (will probably use the same TI Eval Module) and SiC's. But first lets see if the thing works
with the bench test setup.
Will post the Processor design if it gets that far successfully.
Regards,
SL