Hello Gents and Gals
I have a processor board ...very fast very powerful
The intention is to develop FOC or DTC control.
I have cobbled a V/F control (no encoder) at the back end. The intention is FOC or DTC control.
Acquiring Stator resistance is straight forward without getting overly bogged down in some of the "thesis style methods".
The simplified approach I have taken for acquiring the stator resistance and Inductance is:
I have opted to use a sort of pulse test.
1. Pulse a delta connected motor on a single phase.
2. Measure the current.
3. Filter the measurement, (CT has some noise on it )
4. Get max DC current ...set as max current
5. Calculate Stator resistance......Rs = PulseVolatge/SteadyCurrent( often sited as a dc test )
5. Pulse again, when current is 0.63 of max current get time taken to get to that point
6. Calculate Ls = Timetaken/Resistance
It would great if somebody could see any merit, or not, to this approach or possibly site an article to this method. I would appreciate it.
Also, exactly what would I be measuring with the off pulse, "off pulse test", this would be more or less the above steps in reverse but what am I measuring then, I get a sneaky feeling that I would "see" some rotor parameters?
I have not found any information on the above approach, most approaches seem to revolve around the no-load and locked rotor test.
If I could get the motor parameters without turning the motor that would be great.
Or is the approach a bit fanciful?
Thanks
Carl
I have a processor board ...very fast very powerful
The intention is to develop FOC or DTC control.
I have cobbled a V/F control (no encoder) at the back end. The intention is FOC or DTC control.
Acquiring Stator resistance is straight forward without getting overly bogged down in some of the "thesis style methods".
The simplified approach I have taken for acquiring the stator resistance and Inductance is:
I have opted to use a sort of pulse test.
1. Pulse a delta connected motor on a single phase.
2. Measure the current.
3. Filter the measurement, (CT has some noise on it )
4. Get max DC current ...set as max current
5. Calculate Stator resistance......Rs = PulseVolatge/SteadyCurrent( often sited as a dc test )
5. Pulse again, when current is 0.63 of max current get time taken to get to that point
6. Calculate Ls = Timetaken/Resistance
It would great if somebody could see any merit, or not, to this approach or possibly site an article to this method. I would appreciate it.
Also, exactly what would I be measuring with the off pulse, "off pulse test", this would be more or less the above steps in reverse but what am I measuring then, I get a sneaky feeling that I would "see" some rotor parameters?
I have not found any information on the above approach, most approaches seem to revolve around the no-load and locked rotor test.
If I could get the motor parameters without turning the motor that would be great.
Or is the approach a bit fanciful?
Thanks
Carl