Insensitiveness in the Governors:

The friction force at the sleeve gives increase to the insensitiveness in the governor. At any specified radius there shall be two different speeds one being while sleeve moves up and other while sleeve moves down. Given figure illustrates the controlling force diagram for such as governor.

The equivalent three values of speeds for the similar radius OA are following:

(a)        The speed N while there is no friction.

(b)        The speed N′ while speed is rising or sleeve is on the verge of moving up, and

(c)        The speed N″ while speed is dropping or sleeve on the verge of moving down.

It means that, while radius is OA, the speed of rotation might vary among the restrict N″ and N′, without any displacement of the governor sleeve. The governor is call to be insensitiveness over this range of speed. So,

 ∴         Coefficient of insensitiveness =  

                                                                       . . . (12.34)