Difference between Real Flux Density and Apparent Flux Density of DC Machines:
The difference between Real Flux Density and Apparent Flux Density of DC Machines is given in table below
| Sl no | Radial Cooling | Axial Cooling |
| 1 | It is due to actual flux through a tooth. | It is due to total flux that has to pass through the tooth. |
| 2 | It is always less than apparent flux density. | It is always greater value than real flux density. |