Recent content by kiwifiat

It is the absolute magnitude of the error that matters, not the sign. Given sinusoidal waveforms for the bemf and the current being driven into the motor, the power lost due to a 4 degree misalignment will be more or less identical regardless of the sign of the error. Your data shows that the...

Since you have to pass a TUV inspection in Germany you are probably best to follow in the footsteps of Johannes Hübner and his conversion of an Audi A2 using a Prius Gen2 transaxle and inverter using the openinverter board he designed specifically for the task: [DRIVING] Audi A2 /w Prius Gen2...

Yes it is perfectly possible but there are a couple of issues to overcome. The Prius gen2 inverter has two current sensors but the Lebowski controller requires three. The Gen2 inverter current sensor outputs swing between -10 and +10 volts and need a conditioning circuit to make them compatible...

Looks like you are making good progress. If you can reduce the average HALL offset error then the Std_dev will also drop so aim to get the average offset as close to zero as you can. Don't forget to zero the collected stats every time you make changes to the HALL forward offset and once you...

What settings did you use on the acceleration limiter? You should be setting the kerpm/s to a realistic maximum acceleration rate that your bike could achieve. So estimate how fast you think you can accelerate to say 40mph in dry conditions, calculate back to the erpm the motor is running at...

I will be using a 23 pin Ampseal header. Early April as a wild guess for an ETA. I still have one populated V1 board available from the initial run of ten, pm if you are interested. Cutting the oem socket out is painful as it is screwed in from below the PCB with no access to the screw heads. I...

IMO the issue is that HALL sensors are crap, especially when they are reliant on magnetic fields and they are placed in a lightning storm of magnetic fields that vary with phase current. The best solution was that proposed and solved by ES member Bertie using optical sensors that are impervious...

The board has support for the resolver fitted to the HSG, just connect and tune. The board gerbers haven't been released yet as there is a revision in the works that makes connecting to the outside world less of a hassle. The current design is meant to connect to the existing oem 20 pin socket...

The IMA board has a resolver to HALL converter that is designed to support the type of resolvers found on automotive ev motors like the Hyundai HSG, Nissan Leaf, Fiat 500E/SMART ForTwo E drive that look like this: The type of resolver your motor has looks more like a RLS type that won't work...

The error current setting needs to be within the range of accuracy of the sensors used. The current sensors in the IMA inverter are rated for 300A after that the linearity is not guaranteed. You could probably push the current sensor output amplitude to +- 2.25V which would give you ~335A. I...

Overall that is a good outcome, I would be interested to see how 40-50A of field weakening affected your top speed. That is odd, haven't come across that situation before. Are you sure you have "online parameter save" set in menu Z? I don't understand your HALL table columns "before" and "Mod...

It is difficult to determine if the issue you have is entirely down to sensored drive mode 2 or transition mode 23 when you have the transition set at a low erpm. If you set the drive 2-->3 transition at say 7-8000 erpm you should be able to get a better feel for where the problem is. It is an...

Are you using field weakening now? Do you have a higher maximum speed with the Lebowski compared to the Kelly? I see from the config data you posted in the other thread that you have menu h) sub item b) set at default settings for sensored operation. As discussed increasing b) towards the...

The board was designed for driving a Hyundai HSG IPM motor that has a resolver not HALL sensors. It is a straight forward job to remove the resolver to digital components to suit HALL sensors which are the native Lebowski supported rotor position sensors.

Just an update on this topic of current sensor calibration, following past discussions with Lebowski the best option is to autocomplete menu f) and not run the offset calibration. If you do run the offset test repeatedly you will observe that the offsets change which demonstrates the point made...