No load current vibration in Torque Control when I use KMS

bansondou — Tue, 01 May 2018 09:51:30 GMT

I have 2 question about Cureent control of KMS as below:

1. When I test torque control with KMS (no load condition and bare shaft). I find Q-Aixs and D-Aixs current has a big vibration as the picture.

2. I define Q-Aixs current is 0.20 A in torque control (as the below picture) . but in the above picture, Q-Aixs current reference is 0, and D-Aixs current reference is 0.17A. Why?

Re: No load current vibration in Torque Control when I use KMS

linestream-adam — Tue, 01 May 2018 15:31:01 GMT

Banson,

1. That is fairly common for motors running in torque control with no load. I would only expect it to be perfectly flat if you had the motor at stall.

2. In the plot, it isn't showing the Q-axis reference. It is plotting the speed controller output. In torque mode, the Q-axis reference is user.output.drvCommand.statorRefCurrent.q (Q24, BASE_CURRENT). Which should be exactly equal to the value you put in the GUI, stored in user.command.statorRefCurrent.q.

The D-axis reference is plotted against the right axis, which shows it is 0.

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No load current vibration in Torque Control when I use KMS

Re: No load current vibration in Torque Control when I use KMS