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Post by clyevo on May 5, 2015 16:12:30 GMT
At starting speed the torque at maximum carrying load , the current withdrawn by the motor maybe 4-6 times more than rated current. I know the payload of the motion simulator platform should always be far less but still : 1) To facilitate acceleration of the ramp as fast as possible (possibly reducing acceleration ramp and better PID settings), is it beneficial to use higher rated power inverters (Eg : if i use 2.2kw/3hp inverter for a 1.5kw/2hp motor)? 2) Will this practice burn out the coil of the motor? (may have something to do with "service factor", something i cant quite comprehend yet) I found that the price different between 2.2kw and 1.5kw inverter is roughly around 5% to 10%, and feels itchy to buy the most bang for the buck.
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Post by vicpopo on May 5, 2015 18:49:49 GMT
Hi Clyveo,
Yes you can but normally the inverters are designed to carry the load according the motors . And 2,2 kw for a 1,5 kw motor is 46% more , that is too much .With 25 % more that enough. For me it's not necessary but if someone wants to give an another advice no problem.
With a stronger inverter and if the inverter is a brand known you won't !! And if you take an inverter 25% stronger you have also the security.
But anyway an inverter 46 % stronger than the motor and a good inverter setup you won't burn anything!
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Post by tronicgr on May 5, 2015 19:05:23 GMT
For usual 6DOF platforms destined for use in home environment I recommend 1.5hp VFDs on 1HP motors. The reason is to be able to decrease the ramp values to minimum without having error indications on the vfds.
You can use proportionally bigger vfd inverters as you suggest above and have no fear of burning anything. The motor will draw as much current it needs when in load and the only way to overheat the motor would be to stall it by wanting it to move bigger load than it can handle.
Thanks Thanos
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Post by clyevo on May 6, 2015 7:57:55 GMT
For usual 6DOF platforms destined for use in home environment I recommend 1.5hp VFDs on 1HP motors. The reason is to be able to decrease the ramp values to minimum without having error indications on the vfds. You can use proportionally bigger vfd inverters as you suggest above and have no fear of burning anything. The motor will draw as much current it needs when in load and the only way to overheat the motor would be to stall it by wanting it to move bigger load than it can handle. Thanks Thanos Thanks decreasing acceleration ramp is awesome excuse to spend that little penny more I am buying this : Soro SV8-4T-2.2KW for 1.5kw (2hp) AC motor. They are likely OEM manufacturer of schneider, i think the same one Yue Qi use in his motion simulator, only he uses the 1.5kw version as i can recall. Edit : sorry they used to be vendor of schneider
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Post by mhensen on May 6, 2015 19:41:44 GMT
Great find on the soro link.. Are these ok for this 6-dof project..
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Post by clyevo on May 7, 2015 2:29:06 GMT
It got vector control and cheap. But downside is i think the processor could be slow (no way to know) and there is no auto-tuning feature like hitachi and delta brand
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