The Flywheel effect is the continuation of oscillations in an oscillator circuit after the control stimulus has been removed. This is usually caused by interacting inductive and capacitive elements in the oscillator. Circuits undergoing such oscillations are said to be flywheeling.
The flywheel effect may be desirable, such as in phase-locked loops used in synchronous systems, or undesirable, such as in voltage-controlled oscillators.
Flywheel effect is used in class C modulation where efficiency of modulation can be achieved as high as 90%.
Flywheel Effect or Polar Moment of Inertia
The flywheel effect, sometimes also referred to as “Mass Momentum”, is a term used to describe the property of a system to remain at a given velocity or kinetic energy. It is generally applied to rotating mass, such as flywheels or clutch plates.
The following equation will estimate the Flywheel Effect or Polar Moment of Inertia.
| Description | Equation |
|---|---|
| Flywheel Effect or Polar Moment of Inertia |  |
| Mean Angular Velocity |  |
| Coefficient of Steadiness |  |
Where:
| Symbol | Description | Units |
|---|---|---|
| Wk2 | Flywheel Effect or Polar Moment of Inertia | kN (lbf) |
| E | Excess energy | J (ft-lbf) |
| n1 | Maximum speed | rpm |
| n2 | Minimum speed | rpm |
 |
Average speed | rad/s |
 |
Maximum and minimum angular speed, respectively | rad/s |
| m | Coefficient of Steadiness | - |
| Cf | Coefficient of Fluctuation of Rotation | See Table |
| Coefficient of Fluctuation of Rotation Table, Cf | ||
|---|---|---|
| Driven machine | Type of drive | Cf |
| AC generators, single or parallel | Direct-coupled | 0.01 |
| AC generators, single or parallel | Belt | 0.0167 |
| DC generators, single or parallel | Direct-coupled | 0.0143 |
| DC generators, single or parallel | Belt | 0.029 |
| Spinning machinery | Belt | 0.02–0.015 |
| Compressor, pumps | Gears | 0.02 |
| Paper, textiles, and flour mills | Belt | 0.025–0.02 |
| Woodworking and metalworking machinery | Belt | 0.0333 |
| Shears and pumps | Flexible coupling | 0.05–0.04 |
| Concrete mixers, excavators, and compressors | Belt | 0.143–0.1 |
| Crushers, hammers, and punch presses | Belt | 0.2 |
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