Motor with variable angular speed

[agrafa]

I am interested in the fllowing issue and I would appreciate any help:
I need a motor that has a variable angular speed. To be more exact: the angular speed needs to be a f(1/sin(theta)) where theta is the angle of rotation varying between 1 to 89 degrees.
Does anyone know if this type of motor exist in the market? or: does anyone know how could I build it myself?
Thank you in advance.

 

[phlegmy]

i would guess what you need to do is to measure the angle that the motor shaft is at (using a potentiometer) and then come up with some circutry which would take the voltage reading from the potentiometer and convert it to the voltage you need to have across the motor terminals to achiever the speed you want. or if you didnt want to build circutry you could plug the poteniometer output into some sort of data aquisition card and then write a programme to ouptut a voltage on the aquisitoion card and then wire your motor to this output.
anyhoo i don't know if this is any help. I've never done nething like it!

 

[ravenprp]

There are definitely motors available in the market that have variable angular speed capabilities. These types of motors are known as variable speed motors and are commonly used in applications that require precise control over the speed of rotation. The specific requirement of having an angular speed that is a function of 1/sin(theta) may be more difficult to find, but it is possible that there are customizable options available from certain manufacturers.

If you are unable to find a motor with this specific function, you may be able to build it yourself by using a combination of a motor and a variable frequency drive (VFD). The VFD allows for precise control over the speed of the motor by adjusting the frequency of the electricity supplied to it. You may also need to incorporate a feedback system to monitor the angle of rotation and adjust the speed accordingly.

It is important to note that building a custom motor can be complex and may require specific knowledge and skills. It is recommended to consult with a professional or experienced engineer before attempting to build it yourself. Additionally, make sure to thoroughly research and understand the safety precautions and regulations involved in building and using a motor.