Recent content by lizardmech

There's also PM wire announced a few months ago as well, seems to be some sort of wire that can be pressed into shapes and selectively magnetized or something. https://www.designworldonline.com/pm-wire-magnet-manufacturing-technology-could-change-industries/ They didn't really explain a great...

What does the rotor look like though? If it's an IPM motor with reluctance torque, controlling it will be different to a conventional motor with surface mounted magnets.

Adding loads of poles just increases torque density but it restricts the maximum RPM the motor can run at. Losses in the stator become too extreme if you try to run this type of motor at higher speeds. You can squeeze a little more with thin laminations and special materials but there's only...

What is the motor like? I assume it's an IPM like most other japanese EVs but I can't find pictures or details for this motor.

Nice, the VESC SVM scheme makes it look a little unusual. If you only sample v0 the FOC loop is effectively PWM/2, both v0 and v7 give you 1:1 with selected frequency. With this SVM scheme the low side only switches half as often, apparently it has slightly more torque ripple but 50% less...

Yeah, I looked at doing 100khz GaN VESCs a few times, at those frequencies you can eliminate the electrolytic caps and only have ceramic or ceramic + polymer caps. Those electrolytic caps contribute quite a bit to size and heat, you should also get some minor motor efficiency gains and possibly...

Did you decouple the ADC ISR from the PWM freq so PWM can be set to multiples of the ADC ISR?

I couldn't find detailed motenergy efficiency graphs. I was looking at it compared to the 3kw golden motor axial flux motor. The DA-90 had almost 3x the peak torque at 0 RPM if you feed it enough current, at 4000 RPM the golden motor had lost over 50% of it's rated power and ceased producing...

I have always put it before the shunt but it shouldn't matter, just don't do what I did and forget to put the relatively large 0.1uf filter caps on phase voltage sense output, I did that when building an inverter and it stops instaspin from working but it's easy to miss as they don't explain how...

It looks like although peak power and efficiency aren't noteworthy it has quite a large RPM range where it has decent power and efficiency. It has a new winding method made by some russians using parallel star and delta winding. The heavy weight seems to be as it is an existing motor with new...

Actually these might be quite good, looking at the dyno graphs the peak power and efficiency aren't notable, however they appear to have a broader operating range where they still outputting power with decent efficiency when compared to permanent magnet motors. It also looks like they can...

Yeah, looks like it will be the best reasonably priced MCU for motor control, only thing it lacks is USB like on the 280069, I just wish they would hurry up with the software, it was supposed to be out when the MCU was released now it's been delayed 3 or 4 times.

They still haven't released the instaspin software for the 280049. It was supposed to be out q2 or q3 2018 now it's q2 2019. :roll: The 280049 does look pretty good though.

If you can stay under 80V the Ti ina240 is probably the best option. Anything above that and you will need complex isolated shunt sensors or magnetic based sense such as allegro ACS sensors.

What voltage is the controller going be used for?