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ACIM Sensored Slip problem

victor passe
Prodigy 230 points

Hi, I have a problem with driving a ACIM motor using encoder.

I have connected the sensor to the direction i think i right, when i command a positive iq the speed from the encoder is positive and one mechanical revolution of the motor gives one mechanical revolution in  gives spintac.

The problem I am having is that spintac calulates a way to large slip, when I command 1-2A I get 2Hz mechanical speed and 15Hz electrical speed.

I have verified on a oscilloscope that the electrical frequency is 15Hz and the mechanical frequency is 2Hz.

I have taken the code from lab12A and modified a bit.

What could the problem be that gives this large slip?

  • 0
    Guru 12800 points
    Victor,

    I think it is important to ensure that the motor control is working correctly, before looking into the value of the slip. If you move on to lab 12b is the motor able to spin to the maximum expected speed and is it able to hold the expected value of load?

    How much d-axis current are you setting when you supply 1-2A of q-axis current?

    Can you post your user.h file? It would also be helpful if you could share a motor datasheet/nameplate. Without knowing more about your system it will be difficult to help.