## Engine Speed Governors | Speed Control Governor | Speed Limiters

Proell governor

Watt governor

ii) Spring controlled type Hartnell governor

Hartung governor

2. Inertia and fly-wheel governor 3. Pickering Governor Purpose of governor: 1. To automatically maintain the uniform speed of the engine within the specified limits, whenever there is a variation of the load. 2. To regulate the fuel supply to the engine as per load requirements. 3. To regulate the mean speed of the engines. 4. It works intermittently i.e., only there’s modification within the load 5. Mathematically, it can express as ΔN. Terminology used in the governor: 1. Height of the governor (h): Height of the governor is defined as the vertical distance between the centre of the governor ball and the point of the intersection between the upper arm on the axis of the spindle. The height of the governor is denoted by ‘h’. 2. Radius of rotation ®: Radius of rotation is defined as the centre of the governor balls and the axis of rotation in the spindle. The radius of rotation is denoted by ‘r’. 3. Sleeve lift (X): The sleeve lift of the governor is defined as the vertical distance travelled by the sleeve on spindle due to change in equilibrium in speed. The sleeve lift of the governor is denoted by ‘X’. 4. Equilibrium speed: The equilibrium speed means, the sped at which the governor balls, arms, sleeve, etc, are in complete equilibrium and there is no upward or downward movement of the sleeve on the spindle, is called as equilibrium speed. 5. Mean Equilibrium speed: The mean equilibrium speed is defined as the speed at the mean position of the balls or the sleeve is called as mean equilibrium speed. 6. Maximum speed: The Maximum speed is nothing but the speeds at the maximum radius of rotation of the balls without tending to move either way is called as maximum speed. 7. Minimum speed: The Minimum speed is nothing but the speeds at the minimum radius of rotation of the balls without tending to move either way is called as minimum speed. 8. Governor effort: The mean force working on the sleeve for a given change of speed is termed as the governor effort. 9. Power of the governor: The power of the governor is state that the product of mean effort and lift of the sleeve is called as power of the governor. 10. Controlling force: The controlling force is nothing but an equal and opposite force to the centrifugal force, acting radially (i.e., centripetal force) is termed as controlling force of a governor. In other words, the force acting radially upon the rotating balls to counteract its centrifugal force is called the controlling force.