electric speed control vs. mechanical speed control?

Answer 1

i would assume you are talking about speed control for R/C cars...... in that case i would most definately say ELECTRONIC. they give you much better control and tuning options as well as better and full use of your batteries. much less power drop and energy loss with electronic. also with electronic speed control, you can get one that can be adjusted on preset for the turn of the motor.

Answer 2

Assuming you are talking about sewing machines, there could be two ways to interpret this rather vague question.

An "electric" speed control could be known as a stitch regulator. A stitch regulator is very helpful if you are quilting or doing fancy top-stitching since it controls the stitch length to a length you program in. Every stitch is exactly the same. Manual speed control would be controling the length of the stitches by hand...something that a seasoned seamstress would probably be able to handle. I know after I'd quilted on my first quilt for about 20 hours, my ability to manually regulate my stitches improved greatly.

Speed control can also refer to the speed at which the machine sews. The foot pedal or knee pedal are used to manually control the speed of sewing. Most modern machines also have some sort of "electronic" speed control built in, so when you press on the pedal, the machine won't shift into high gear immediately but will if you continue to press down firmly. The speed of the machine is controlled by the seamstress using the pedal like you'd use a gas pedal in a car.

If you're not taking about sewing machines, what are you talking about?

Answer 3

I don't know for sure what type of motor or speed control system is used in the Volt, but if it's the same as most EVs use, it's a variable frequency AC induction motor. The motor would be driven by a microprocessor-controlled variable frequency DC to AC converter. The variable frequency AC is controlled by three PWM bit streams (Pulse Width Modulation) -- one per phase of the 3-phase motor. The frequency is maintained at a rate slightly higher than whatever speed the motor is currently spinning at, to provide the "slippage" between drive field and rotor windings that's necessary to generate torque in an induction motor.

Answer 4

It really doesn't matter what your application is. An electric one is in general much more accurate and energy saving. Somewhat more difficult to fix if it breaks up somewhere out of civilization. So, go for the electric one if simplicity is not an issue.

Answer 5

Given most of us here don't read minds, knowing what you are asking about would help.

For me, my first thought was for controlling a potter's wheel. Somehow I doubt that was what you were asking about.

Please clarify what you are asking.