Dear all,

I am a physicist, and quite new to explicitly designing Circuits. Now I would like to get into it. can somebody help me and guide me a way on what to read / study in order to get a start. I would like to

• understand how to properly design a 3 phase inverter in order to power an e-motor from a battery
• understand how to scale passives for such an inverter (resistors, DC capacitances, ....)
• understand how to add the logics in order to control the inverter power output to the motor... ideally with some Bluetooth receiver, but in a first step maybe 2 hardware switches would be enough.

Would be glad for input that helps me go further! Especially information on parasitic effects, when designing such a system would interest me...

Thanks
Artur

 

Dear all,

I am a physicist, and quite new to explicitly designing Circuits. Now I would like to get into it. can somebody help me and guide me a way on what to read / study in order to get a start. I would like to

• understand how to properly design a 3 phase inverter in order to power an e-motor from a battery
• understand how to scale passives for such an inverter (resistors, DC capacitances, ....)
• understand how to add the logics in order to control the inverter power output to the motor... ideally with some Bluetooth receiver, but in a first step maybe 2 hardware switches would be enough.

Would be glad for input that helps me go further! Especially information on parasitic effects, when designing such a system would interest me...

Thanks
Artur

I would say start with the motor specifications so you can specify the controller. But having said that, this is probably not the type of project to cut your teeth on. You can buy them for less than you can build one (usually) and make a lot less smoke.

 

I would have to agree, this seems like a very ambitious project for a initial circuit design.
Max.

 

Agreed- this is an ambitious project to start on.

Mistakes here are dangerous and expensive, and the first 99 tries will be mistakes, as they always are when learning new things.

You have complex circuits handling high voltages and power levels, made up from expensive parts.
It will all blow up in a spectacular manner- often.

Start with a less complex, risky and expensive project.

 

Guys, thanks so far for the quite rapid reactions.

I do realize that this is quite a big chunk to swallow. In principle I know how to build up an inverter together with the according gate driver for the 3 phase inverter. But I don't know how to correctly scale the passives (like gate resistors, dc link capacitance etc...) depending on the e-drives power. Isn't there some consistent literature deriving the correct design of such a system?

Now lets assume its really to big a project for the likes of me (noob to professional electronics). What would you start with? If we want to keep the target of finally understanding how to design my motor drive.

 

Depends on which road you take, there is the likes of Microchip that offer many app notes and support for different types of motor control etc and inverter methods.
Max.

 

Guys, thanks so far for the quite rapid reactions.

I do realize that this is quite a big chunk to swallow. In principle I know how to build up an inverter together with the according gate driver for the 3 phase inverter. But I don't know how to correctly scale the passives (like gate resistors, dc link capacitance etc...) depending on the e-drives power. Isn't there some consistent literature deriving the correct design of such a system?

Now lets assume its really to big a project for the likes of me (noob to professional electronics). What would you start with? If we want to keep the target of finally understanding how to design my motor drive.

I would still start with the motor. You need to pick one with enough power for your goal. This will lead you to a required battery voltage and the output drivers. From there you can work backwards thru the design.