Motion Control and Motor Drives

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torque control without torque sense, just let the driver works in torque mode

hi, I am using a 7344. I want to come true the torque control through the driver works in torque mode.
Is it right if i just let the node of load DAC a certain value with a loop at the same time .I have tried, but the motor is not stable.
Why this happen?And if I want to come true the toraue control  how should I programme?Do i need to do some PID control?
 
Thanks for your suggestion!Please give me some help.Thanks again
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