I would like to build a pendulum from scratch and model/control via Matlab. I don't know what DC motor should I use that has low friction (low static friction), so the pendulum can rotate by its self. Moreover, I would like to have an encode with "good" precision, less then 1^o.
I want to control the position of the pendulum by using the motor to put energy in the system. It will be a closed loop control and the controlled variable is the voltage drop on the motor.
[![enter image description here](https://i.stack.imgur.com/XRiFp.png)](https://i.stack.imgur.com/XRiFp.png)
How to check in a technical specification if the motor has low static friction?

Eg. the technical specification for a motor include:

> 
> Values at nominal voltage: Nominal voltage; No load speed; No load
>  current; Nominal speed; Nominal torque (max. continuous torque);
>  Nominal current (max. continuous current); Stall torque; Starting
>  current; Max. efficiency; Terminal resistance; Terminal inductance;
>  Torque constant; Speed constant; Speed / torque gradient; Mechanical
>  time constant; Rotor inertia.
> 
> 
>