Speed Limit (Odrive V3.6)

1

Hello,

I need your valuable help :slight_smile:
The motor speed is limited in the configuration up to 100rpm/s but in the graph you can see the speed limit is 55turns/s. Why?

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Thanks!

2

Hi RaulG,

Likely this is due to inadequate supply voltage - that graph looks exactly like motor saturation. What motor and supply voltage are you using? Note that the ODrive v3.6 is limited to a 70% modulation magnitude due to hardware constraints - so the maximum speed will be 0.7 * supply_voltage * motor_kv.

3

Yeah! You are right!

Voltage = 24V
kv = 162rpm/V

According your comments … MaxSpeed = 24V * 182 rpm/ V * 1/60 * 0.7 = 51rev/s

Where I can read this kind of limitations? i didn’t see in the manual…

Thanks!

4

Unfortunately this isn’t very well documented, apologies - v3.6 is end of life, and its documentation is no longer being updated. Strangely, this is actually a very common limitation among BLDC controllers, just not very frequently mentioned.