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Topic-icon MBL1660A Sensorless - Controller does not change motor power

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1 year 3 weeks ago #29533909 by sylvain.joyeux
I've managed to set up my MBL1660A in sensorless mode so that the motor starts turning smoothly, in both directions.

However, once it starts, I can't change the rotation speed. Changing the motor command does not change the applied motor power.

Sensorless calibration does not work - the result is much worse after than before.

Note: I noticed that the motor power used in the startup phase becomes the minimum motor power that will ever be applied ... is that on purpose ? Could it be changed ? I noticed that when I have a low max deceleration, stopping the motor is very smooth, which I guess means that the controller could apply lower power to the motor.

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1 year 3 weeks ago #29533912 by Gabriel_Isko
Hey, this stuff doesn't make any sense at all in regards to how our sensorless should function. Let me know which version of firmware you are on.

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1 year 3 weeks ago #29533917 by sylvain.joyeux
FID reports v1.8d MBL1XXXA 1/8/2018

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1 year 3 weeks ago #29533918 by sylvain.joyeux
Two screen captures with two different commands applied. Speed does not change, and neither does the Motor Power metric. I'm in open loop mode. If I switch to closed-loop speed, it basically behaves the same way but with a different "fixed" motor power, and therefore a higher speed (which is P * the command I apply)

The motor turns smoothly.



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1 year 3 weeks ago #29533919 by sylvain.joyeux
If I run instead in closed-loop speed mode, I get a baseline motor power of P * Start Up Power (here, P=4 and Start-Up Power=50)



If I set a command where P * Command > Start Up Power, the controller does apply that command and the motor does start to turn faster



Then, if I stop after having set a low-ish max deceleration, I get a "clean" deceleration:

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1 year 3 weeks ago #29533921 by Gabriel_Isko
Does this happen at higher motor commands?

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1 year 3 weeks ago #29533923 by sylvain.joyeux
In Open Loop, yes. It's stuck at the startup power. I can add that the reported "Hall RPM" (which I guess is taken from the back EMF) is good - I have an encoder coupled to the motor on a test bench, and it's fairly accurate.

In Close Loop Speed mode, the motor power starts to change when Command * P is greater than the startup power.

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