# Estimating Torque for Solar Panel-Powered Servo Motor

• rngd
In summary: The servo at the bottom should only be used for the round base, as it will not be rotating. The servo at the top should be able to handle the torque required.
rngd
Guys, I have a solar panel screwed onto a shaft which connects directly to a servo motor shaft. How much should the torque rating of the servo be to be able to rotate it ? I mean an estimate of the minimum torque required. The panel weighs 0.8kg plus a few grams for the solar panel holder (made of perspex). No gears are used.

Thank you.

You'll need an estimate of either the radius of gyration or the moment of inertia about the rotating axis. You will also have to either assume or specify a rate of angular acceleration about that axis.

FredGarvin said:
You'll need an estimate of either the radius of gyration or the moment of inertia about the rotating axis. You will also have to either assume or specify a rate of angular acceleration about that axis.

I would need the servo shaft to rotate a total of 135 degrees, rotating a few degrees every half an hour for eight hours (It will operate like a stepper, stepping during each hour). The speed of rotation is not important, as long as it rotates. The panel's length is 32cm and height is 18 cm. It is a sun tracker.

There will also be another servo to rotate the round base.

Pls see diagram attached below.

Does this help ?

#### Attachments

• DSC00305.JPG
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If the collector is balanced, and with the angular velocity being small, the torque required from the motor is tiny. I'd look into a telescope clock drive (if they still make them). Otherwise, you can get a stepper-motor upgrade kit, but they are more expensive than one that just plugs in and runs at the clock rate.

russ_watters said:
If the collector is balanced, and with the angular velocity being small, the torque required from the motor is tiny. I'd look into a telescope clock drive (if they still make them). Otherwise, you can get a stepper-motor upgrade kit, but they are more expensive than one that just plugs in and runs at the clock rate.

How tiny ? The panel weighs 0.8kg. Is this servo sufficient (3.40 kg-cm torque) ?

http://www.databitz.com/Resources/crservo.pdf

What about the servo at the bottom (there will be some bearings below the base) ? It seems like the top would be a bit heavy. The whole frame will be made of perspex.

Last edited by a moderator:

## 1. How do you calculate torque for a solar panel-powered servo motor?

The torque of a motor can be calculated by multiplying the force applied to the motor by the distance between the point of application and the pivot point. For a solar panel-powered servo motor, the force is provided by the solar panels and the distance is the radius of the servo motor's rotation.

## 2. What factors affect the torque of a solar panel-powered servo motor?

The torque of a solar panel-powered servo motor can be affected by a variety of factors, including the intensity of sunlight, the size and efficiency of the solar panels, the gearing of the motor, and the load being moved by the motor.

## 3. Can torque be increased for a solar panel-powered servo motor?

Yes, there are a few ways to increase the torque of a solar panel-powered servo motor. One way is to increase the size and efficiency of the solar panels, providing more force to the motor. Another way is to use a gearbox to increase the gear ratio, which will increase the torque output of the motor.

## 4. How does temperature affect the torque of a solar panel-powered servo motor?

The temperature can affect the torque of a solar panel-powered servo motor in a few ways. Higher temperatures can decrease the efficiency of the solar panels, resulting in less force being provided to the motor. Additionally, extreme temperatures can also affect the lubrication of the motor, which can impact its overall performance.

## 5. Are there any safety concerns when estimating torque for a solar panel-powered servo motor?

Yes, it is important to consider safety when working with any type of motor. When estimating torque for a solar panel-powered servo motor, make sure to handle any electrical components with caution and follow all safety precautions outlined by the manufacturer. Additionally, be aware of any potential hazards in the surrounding environment, such as moving parts or loose connections.

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