Big Bang
Dear Mr. Raghu Nathan,
an electric motor if started DOL (direct on line) can deliver the pullup / breakdown torques within fractions of a second. If then at the breakaway mode the delivered torque does not suffice to accelerate the load, the motor will remain stalled and then eventually the system will not work.
So probably for your gate you would consider a controlled startup, where the startup torque will be delivered for a certain time (~ 1 minute). Perhaps consider a motor controller. Also, this is very much more smooth in operation. However, the applicable loads in startup and steady state modes must be duly investigated & considered, adding a sensible margin to cover uncertainties in the load assumptions.
Regards
R. ■
Re: Rotary Actuator Starting Torque
Mr. Roland Heilmann
Thanks for your valuable advice. Will look into the aspect of contolled start up of motor. ■
Rotary Actuator Starting Torque
Hi all,
we are designing an motorized rack and pinion gate operates with the help of rotary actuator. i assume that maximum output torque(during starting) of an actuator is 2 to 3 times of rated output torque(Depends on motor's starting to running torque ratio).So that required breakaway force for initaing gate movement form static condition will be served by starting torque. And Running force required will be served by actuator rated torque. whether the above assumed criteria is holds good or actuator output torque shall not be influenced by motor's starting to running torque ratio(i.e Constant output torque as rated) .
kindly advice in this regards
with thanks
Raghu nathan
Typical Rotary Actuator
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