DC motor modelling to drive a ship propeller
DC motor modelling to drive a ship propeller
(OP)
Hi There,
I want to mathematically model a DC motor connected to a ship propeller through shaft but i am very confused because of the load torque.
I am using the following block diagram to model my motor. Is the load torque is the propeller torque ?? or the motor torque should be equal to the required propeller torque and the load torque in the block diagram should be zero ??

Many Thanks in advance
I want to mathematically model a DC motor connected to a ship propeller through shaft but i am very confused because of the load torque.
I am using the following block diagram to model my motor. Is the load torque is the propeller torque ?? or the motor torque should be equal to the required propeller torque and the load torque in the block diagram should be zero ??

Many Thanks in advance





RE: DC motor modelling to drive a ship propeller
Model of load (propeller), to obtain Tl at any speed (from allowed range) it's another task, maybe much difficult.
RE: DC motor modelling to drive a ship propeller
I can calculate load torque (propeller torque) but how will we take moment of inertia (J) of the propeller and the shaft into consideration ??
RE: DC motor modelling to drive a ship propeller
Or are you asking us how many kgm2 that moment of inertia is? We cannot know. You've got the dimensions and the specific gravity of those parts.
Gunnar Englund
www.gke.org
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Half full - Half empty? I don't mind. It's what in it that counts.
RE: DC motor modelling to drive a ship propeller
J total = J motor + propeller + shaft ???
RE: DC motor modelling to drive a ship propeller