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Join Date: Aug 2007
Posts: 4

Power Rating of Motor

08/30/2007 9:06 AM

what type of motor should i use based on these calculations and what is the power rating of the motor .How much power supply do i need to operate the motor if i want to use a solar panel as the power supply.

Given: Diameter of the railing, D =1.3m,

Parameter of the railing, P= pi x 1.3m=4.084 m,

Diameter of the gear attached on motor, d = 0.02m,

Distance travel for 1 rev of motor = pi x 0.02m = 0.06283m

Since the canvas cover must covered the railing under 5 seconds. It means 1 second the canvas cover must travel =(4.084m/5)=0.8168m

The speed of motor needed to turn in order to closed the canvas cover under 5 seconds,

Revolution per second = 0.8168/0.06283 = 13

RPM = 13 x 60 = 780

Torque, T = Fr

=14.7 x 0.01m

=0.147 Nm

Power of the motor, P = Tw

=0.147x780x(2pi/60)

=0.147 W

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Anonymous Poster
#2

Re: Power Rating of Motor

08/31/2007 11:53 AM

How did you derive or measure the Force (Torque)?

Otherwise you are in the fractional Hp range and a dc motor for 12 volts and a small solar charged battery may do the trick.

You don't specify how often - once per day? It sounds like an awning you are retracting.

From experience I always like a litlle extra power. For a one off the cost of a larger motor would be a fraction of the cost of the project.

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Join Date: Aug 2007
Posts: 4
#3
In reply to #2

Re: Power Rating of Motor

08/31/2007 9:29 PM

thanx for the good feedback.

actually im planning to build a clothes horse that can cover(like a rain protector) the clothes when its raining.Then i need to use a motor to move the cover(example canvas)around the reel of the clothes horse.Btw the clothes horse shaped like a tall cylinder.I dont know what type of motor to be used and how much power rating of the motor.Because the clothes horse is going to be placed outside the house, i prefer to use a solar panel as a power supply.But the problem is that i dont know how to find the right solar panel and also the motor.

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