Lebowski
10 MW
Braking current ?
Just curious, can you post the hex ?
Just curious, can you post the hex ?
jackbauer said:Hex attached
a) PWM frequency: 8kHz
b) deadtime: 1999ns
c) dutycycle testsignal: 1748%
d) toggle high side polarity, now active HIGH
e) toggle low side polarity, now active HIGH
f) test PWM signals
g) autocomplete
h) loop sample frequency: 10.67 kHz
c) regen rampup start, end: 0, 39775 erpm
d) accept direction change below: 0 erpm
code: 0, angle: 358 deg, confidence: 0, used: no
code: 1, angle: 154 deg, confidence: 6, used: yes
code: 2, angle: 35 deg, confidence: 6, used: yes
code: 3, angle: 95 deg, confidence: 6, used: yes
code: 4, angle: 274 deg, confidence: 6, used: yes
code: 5, angle: 213 deg, confidence: 6, used: yes
code: 6, angle: 334 deg, confidence: 6, used: yes
code: 7, angle: 358 deg, confidence: 0, used: no
jackbauer said:Great thanks. I'll do some more experiments. I'm keen to get a solution for using ev motor resolvers. Any plans for digitally interfacing a resolver to digital converter?
jackbauer said:Arlo sorry did I mess up your name? My apologies.
Lebowski said:jackbauer said:Great thanks. I'll do some more experiments. I'm keen to get a solution for using ev motor resolvers. Any plans for digitally interfacing a resolver to digital converter?
At the moment not... all pins on the chip are in use so there's just nowhere to connect to. I am thinking about switching over to 64 pin chip so it could be an option there, but the 40pin 30F is too small. But for the 64 pins I have plans to try to build something like TI has where it can sensorless standstill measure the rotor position using the inductor values.
Arlo1 said:Lebowski said:jackbauer said:Great thanks. I'll do some more experiments. I'm keen to get a solution for using ev motor resolvers. Any plans for digitally interfacing a resolver to digital converter?
At the moment not... all pins on the chip are in use so there's just nowhere to connect to. I am thinking about switching over to 64 pin chip so it could be an option there, but the 40pin 30F is too small. But for the 64 pins I have plans to try to build something like TI has where it can sensorless standstill measure the rotor position using the inductor values.
Isn't the TI method a Tone method (like you used to have) and that tone takes away from the available energy the controller can put into the motor for torque?
jackbauer said:Another stupid question : Will this run an induction motor?
Lebowski said:Nope, it runs BLDC and IPM (my own private FOC algorithm I use actually runs the Switched Reluctance part of an IPM motor correctly (so at max efficiency)). It should also run an SR motor for as long as you don't remove the throttle current.
I never had access to an induction motor so never looked into those.
Lebowski said:Also for an IPM you want Id (i had to look that one up because all throught my code I use different terms, i use real and imaginary like you have with complex number theory) to be 0. But it depends on motor design and phase difference between saliency and backemf....
The algo i use automatically goes for point of max torque per amp.
kiwifiat said:Lebowski said:Also for an IPM you want Id (i had to look that one up because all throught my code I use different terms, i use real and imaginary like you have with complex number theory) to be 0. But it depends on motor design and phase difference between saliency and backemf....
The algo i use automatically goes for point of max torque per amp.
Interior magnet motors need Id to be negative to maximize torque per amp, from the Oak Ridge National Laboratory evaluation of the 2004 Prius drive train:
FOC_Torque_equation.PNG
Did you mean SPM you want Id=0, which as far as I know is true?
Arlo1 said:kiwifiat said:Lebowski said:Also for an IPM you want Id (i had to look that one up because all throught my code I use different terms, i use real and imaginary like you have with complex number theory) to be 0. But it depends on motor design and phase difference between saliency and backemf....
The algo i use automatically goes for point of max torque per amp.
Interior magnet motors need Id to be negative to maximize torque per amp, from the Oak Ridge National Laboratory evaluation of the 2004 Prius drive train:
FOC_Torque_equation.PNG
Did you mean SPM you want Id=0, which as far as I know is true?
The leaf motor in my car running daily for 1.5 years is a IPM rotor