Combustion Engine/BLDC generator

Support for creating custom user applications on the VESC.
arvidb
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Re: Combustion Engine/BLDC generator

Postby arvidb » 28 Sep 2016, 20:16


sagaris
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Re: Combustion Engine/BLDC generator

Postby sagaris » 28 Sep 2016, 20:54


rew
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Re: Combustion Engine/BLDC generator

Postby rew » 29 Sep 2016, 14:51

The motor constant in RPM/V is inversely proportional to the torque per ampere. Both can be called "The motor constant".

The limit is "about 50A" for the VESC. So your "max 12.6V at 7000RPM" dictates a limit on your motor.

If you were to chose that 600KV motor, at 1V your motor would do 600RPM, or 10 rev/sec. or about 60 rad/sec. So the motor constant in SI units is 60rad/sec/V. This means that the torque constant is 1/60Nm/A. So with 50A you'd be able to generate almost 1Nm of torque. If that doesn't start your motor you need a lower KV motor, and a bigger voltage on your battery. Simple!

sagaris
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Re: Combustion Engine/BLDC generator

Postby sagaris » 29 Sep 2016, 21:56


rew
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Re: Combustion Engine/BLDC generator

Postby rew » 30 Sep 2016, 15:26

In theory, stall torque at start of a BLDC motor is simply the torque constant times max amps. In practice if the load is high, sensorless startup may take some tuning. Or you can use sensors.

I don't know the starting torque of your ICE.

stigan
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Re: Combustion Engine/BLDC generator

Postby stigan » 17 Aug 2017, 12:08

Hello,

Did anyone move further using the VESC as generator ?

I am building a wind turbine and I would use VESC (v4.12 I think)
Did anyone get to make a custom application?

Would be great with one that keeps RPM constant and voltage constant while generating current. Nice if the RPM could be varied using some input channel.

BR
Stig

rew
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Re: Combustion Engine/BLDC generator

Postby rew » 17 Aug 2017, 19:02

If you simply tell the VESC to use the ADC app, you have an analog signal for "braking force".

Or if you command the VESC to run at a certain speed, it will adjust the torque to maintain that speed. If the wind would run your rotor at 1000 RPM, and you command 700 RPM, the VESC should be able to continue to extract energy from the rotor at 700RPM. You do have to take a bit into account that when the wind drops the VESC will start to drive the rotor at 700RPM... So you'll have to maintain an eye on the situation and command a lower RPM when the energy goes positive. (because it is normally used as a motor, postive energy use is battery->motor).

Apparently ICE engines exist that require about 50Nm of starting torque.... (I learned that since my last post in this thread).


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