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motor max rpm and current severely limited?

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Roy Zhang
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Joined: 2021-05-27 22:27
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motor max rpm and current severely limited?

currently when I attempt a rpm sweep experiment to 15000 the value would max out at 10000 regardless of the changes I've made. Same thing when I give ppm input from my taranis qx7. the motor can also be easily stalled by hand and reaches a max current of only about 20A. here's a screenshot of the experiment plot. 

https://gyazo.com/fd831e17d969ceb5136b5d64d77d0d4f

 

the vesc manufacture recommend to use BLDC mode and set max erpm to 60000, I've configured the rest according to the motor and battery.

any help is appreciated!

 

I'm using 

VESC: Maytech vesc100A v4

MTVESC100A V4 based Speed Controller with Heat Sink On & off Switch – Maytech.cn--Maytech official website

motor: Scorpion SII-4035-450KV

Scorpion SII-4035-450KV - Scorpion Power System (scorpionsystem.com)

battery: 8s 8000mah 150C (2 4s in series)

Roy Zhang
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Last seen: 5 months 1 week ago
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Joined: 2021-05-27 22:27
Posts: 2

realize when i lower the battery voltage cutoff to less than the suggested number for 8s (start: 27.2v, end: 24.8v) the erpm was able to reach 20000. I believe the voltage drop is due to acceleration higher rpm that was previously restricted. However, when I let go of throttle the battery rebound to full charge level. Is there a way to set a voltage limit that allows for momentary dips but prevents battery from completely discharging?

Roy Zhang

vadicus
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Joined: 2018-08-17 07:26
Posts: 351

Just reduce the current limits to minimize the battery overload or use the battery rated for your desired current output.

Unusual voltage drop simply means you are overloading the battery because it can't output the current you are trying to draw from it.

 

 

 

NextGen FOC High voltage 144v/32s, 30kw (https://vesc-project.com/node/1477)