DIFFERENTS CURRENTS

General topics and discussions about the VESC and its development.
andre_denzel
Posts: 2
Joined: 08 May 2018, 13:42
Location: Sao Jose dos Campos

DIFFERENTS CURRENTS

Postby andre_denzel » 08 May 2018, 13:59

What is the difference between CURRENT IN and CURRENT MOTOR?

Best Regards

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arvidb
Posts: 234
Joined: 26 Dec 2015, 14:38
Location: Sweden, Stockholm

Re: DIFFERENTS CURRENTS

Postby arvidb » 08 May 2018, 15:59

Well, current in is the current pulled from the batteries, and current motor is the current supplied to the motor windings. They can differ since the VESC acts as a DC/DC converter: P = Uin*Iin = Umotor*Imotor. Since the motor voltage is lower than the battery voltage except when going full throttle, the motor current will be larger most of the time.

devin
Posts: 255
Joined: 08 May 2017, 01:55
Location: San Francisco, California, US

Re: DIFFERENTS CURRENTS

Postby devin » 08 May 2018, 16:44

@andre_denzel here is a chart showing the predicted performance of an electric skateboard in bldc mode with 50a motor limit and 50a battery limit software user settings... take a look at the blue and black lines, top left chart (motor amps and battery amps) and the red line, bottom right chart (battery amps).

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this chart shows different user settings (120a motor limit and 50a battery limit)

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andre_denzel
Posts: 2
Joined: 08 May 2018, 13:42
Location: Sao Jose dos Campos

Re: DIFFERENTS CURRENTS

Postby andre_denzel » 08 May 2018, 17:38

You were very helpful.

Thanks very much!!

Regards!


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