OK So I will start this way.... I have a 1969 Road Runner. I don't use it. Burning $100-$200 a night in fuel is not fun to me all it does is help some oil tycoon get more spoiled. I have done many things with this car DIY 16 injector EFI system where 8 run all spraying on the backs of the valves the time and 8 spray down the runner thoughts at Higher throttle positions for more HP a 4speed Auto with .69 ratio overdrive. I can get in the mid 20s for MPG (cdn. gallon = 4.54 litres) But Im done with gasoline. SO Either I spend a whole bunch of time working on it to sell it... Or I make a electric drive train for it.
Start. I have a bunch of induction motors. And I'm thinking about making them into PMAC motors see this thread. But the problem lies in the inverter. Although its purely amazing what a little mosfet can flow for amperage its still not enough. SO what I have thought about and apparently Mr Highhopes was thinking the same thing is splitting the inverter up to a 6 or 9 phase system.
Here is how I see it working. Lets just use a 6 phase as an example. Its not truly a 6 phase its more 2 separate motors in one case it will be 2 sets of three phase wires and non of either set will conduct to the other. Lets run though the thoughts as If the same motor was just going to be a 3 phase. Say I build the first motor for our Honda CRX. It will need ~150kw to make me happy. So lets start with trying to use 200 v mosfets. So maybe 150v under load. 150,000/150=1000 amps.
So we will need ~1000 or more phase amps for a 3 phase. But if we split it we could use 2 separate power stages for 1/2 the amps so 500amps or more....
Their is a couple benefits to this. 1 you will be taking sections of the motor and paralleling them to make 2 sets of phase wires which will give you 2x the inductance and resistance per set of phase wires. As well you can run a fuse to each power stage and if one fails it will still run depending on how you monitor current. This will be for the inverter because it only has to be designed for ~500 amps instead of 1000. Which as we all know causes the issues. Now a lot of oems are just upping the voltage and running the windings in series inside the motor. But I want to keep the voltage low as I can because higher voltage presents its own set of problems.
So I figure with the controller having 2 separate power stages it can have 1 doing the current measurement and phase voltage measurement and the other just a dummy powerstage where it just uses the same gate signals as the first one. The motor will need to be wound so the phase phases measured don't pick up stray measurements from the other section of the motor but I don't think that will be to hard.
if I can get this to work for the motor for the CRX at ~150kw then I will build the one for the Road Runner with even more power
Start. I have a bunch of induction motors. And I'm thinking about making them into PMAC motors see this thread. But the problem lies in the inverter. Although its purely amazing what a little mosfet can flow for amperage its still not enough. SO what I have thought about and apparently Mr Highhopes was thinking the same thing is splitting the inverter up to a 6 or 9 phase system.
Here is how I see it working. Lets just use a 6 phase as an example. Its not truly a 6 phase its more 2 separate motors in one case it will be 2 sets of three phase wires and non of either set will conduct to the other. Lets run though the thoughts as If the same motor was just going to be a 3 phase. Say I build the first motor for our Honda CRX. It will need ~150kw to make me happy. So lets start with trying to use 200 v mosfets. So maybe 150v under load. 150,000/150=1000 amps.
So we will need ~1000 or more phase amps for a 3 phase. But if we split it we could use 2 separate power stages for 1/2 the amps so 500amps or more....
Their is a couple benefits to this. 1 you will be taking sections of the motor and paralleling them to make 2 sets of phase wires which will give you 2x the inductance and resistance per set of phase wires. As well you can run a fuse to each power stage and if one fails it will still run depending on how you monitor current. This will be for the inverter because it only has to be designed for ~500 amps instead of 1000. Which as we all know causes the issues. Now a lot of oems are just upping the voltage and running the windings in series inside the motor. But I want to keep the voltage low as I can because higher voltage presents its own set of problems.
So I figure with the controller having 2 separate power stages it can have 1 doing the current measurement and phase voltage measurement and the other just a dummy powerstage where it just uses the same gate signals as the first one. The motor will need to be wound so the phase phases measured don't pick up stray measurements from the other section of the motor but I don't think that will be to hard.
if I can get this to work for the motor for the CRX at ~150kw then I will build the one for the Road Runner with even more power