ACIM motor with resolver testing
Posted: Wed Sep 23, 2020 7:29 am
I have made a dual Huebner controler drive on a single Volt inverter platform.
viewtopic.php?f=2&t=1027#p16839
Idea was to use two power stages independently from one another. Both support resolver interfaces.
So for the first controler i use 4.90R FOC PMSM drive connected to one Outlander motor.
The second motor is ACIM and i have 4.90R sine firmware loaded.
First brain is master and keeps the precharge and DC switch controls. Both drives are shown DC voltage through a single iso opamp.
I have succesfully started inverter on 90Vdc and spun the PMSM motor and ACIM motor at the same time.
However i see a problem with resolver interface. Or does it just seem that way.
My data shows motor is 8pole (4 pole pairs) with 4 pole (2 pole pairs) resolver. However resolver has 10 teeth on its stator! Shouldnt that made it 10pole? Strange... But i report i have quite forcefull start with setting 4P motor 2P resolver and good control of RPM at that setting. Distribution of torque is rough though. Motor wants to shake upon throttle application and amp draw is high comparing to PMSM motor.
I tried to eliminate some factors....
1. I start in manual sine and i give it command. It start smooth and run smooth up to 60Hz on manual.So motor is not the problem.
2. I program resolver mode and start in this with motor 4pole pairs and resolver 2 pole pairs. Motor would turn but very rough. If i change resolver poles it would not turn but jump through poles.
3. When i scope resolver i get good signal result from exciter and 0V to 3V3 signal on Sin Cos return. Is this value too much? Should i reduce my power supply for Sin cos signal? I use 5V split down by 470R/220R to 1,6V.
If i compare Lacrosse resolver with Outlander, there i get below 3Vpp return. So this resolver may be a bit different from others. Maybe resolver return signal is saturating the analog input on Olimex. I will try to reduce voltage on sin/cos input with 510R/220R resistor combination or maybe even 680R/220R. Otherwise i may recommend we use 5V to 1V5 regulator with additional resistor divider to further reduce supply.
viewtopic.php?f=2&t=1027#p16839
Idea was to use two power stages independently from one another. Both support resolver interfaces.
So for the first controler i use 4.90R FOC PMSM drive connected to one Outlander motor.
The second motor is ACIM and i have 4.90R sine firmware loaded.
First brain is master and keeps the precharge and DC switch controls. Both drives are shown DC voltage through a single iso opamp.
I have succesfully started inverter on 90Vdc and spun the PMSM motor and ACIM motor at the same time.
However i see a problem with resolver interface. Or does it just seem that way.
My data shows motor is 8pole (4 pole pairs) with 4 pole (2 pole pairs) resolver. However resolver has 10 teeth on its stator! Shouldnt that made it 10pole? Strange... But i report i have quite forcefull start with setting 4P motor 2P resolver and good control of RPM at that setting. Distribution of torque is rough though. Motor wants to shake upon throttle application and amp draw is high comparing to PMSM motor.
I tried to eliminate some factors....
1. I start in manual sine and i give it command. It start smooth and run smooth up to 60Hz on manual.So motor is not the problem.
2. I program resolver mode and start in this with motor 4pole pairs and resolver 2 pole pairs. Motor would turn but very rough. If i change resolver poles it would not turn but jump through poles.
3. When i scope resolver i get good signal result from exciter and 0V to 3V3 signal on Sin Cos return. Is this value too much? Should i reduce my power supply for Sin cos signal? I use 5V split down by 470R/220R to 1,6V.
If i compare Lacrosse resolver with Outlander, there i get below 3Vpp return. So this resolver may be a bit different from others. Maybe resolver return signal is saturating the analog input on Olimex. I will try to reduce voltage on sin/cos input with 510R/220R resistor combination or maybe even 680R/220R. Otherwise i may recommend we use 5V to 1V5 regulator with additional resistor divider to further reduce supply.