- #1
axe34
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Hi, I'm designing a gadget whereby I'm spinning a plastic propeller attached to a shaft which is attached to a 6V DC motor.
I'm required to do a basic energy analysis of the set-up. The kinetic energy of the propeller is 0.5*I*w^2 (w=omega=angular velocity).
Due to friction (air etc) then the motor will presumably have to supply energy to 'replenish' this lost energy.
My questions are:
1. Is the energy supplied by the motor constant? Or is there an initial surge to get the propeller going, then a somewhat lesser energy supply to keep it going?
2. How do I relate this to time; i.e. how do I analysis power usage?
Any ideas?
I'm required to do a basic energy analysis of the set-up. The kinetic energy of the propeller is 0.5*I*w^2 (w=omega=angular velocity).
Due to friction (air etc) then the motor will presumably have to supply energy to 'replenish' this lost energy.
My questions are:
1. Is the energy supplied by the motor constant? Or is there an initial surge to get the propeller going, then a somewhat lesser energy supply to keep it going?
2. How do I relate this to time; i.e. how do I analysis power usage?
Any ideas?