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| Basis for Comparison | Eddy current Loss | Hysteresis Loss |
|---|---|---|
| Definition | The loss occurs because of the relative motion between the core and the magnetic flux. | The losses which occur because of the reversal of the magnetism is known as the hysteresis loss. |
| Formula |  |  |
| Occur | Interaction of the magnetic flux and conductor. | Because of the reversal of flux. |
| Minimizing Method | By making the core of thin lamination. | By using Silicon Steel Material |
| Basis for Comparison | Alternator | Generator |
|---|---|---|
| Definition | A machine that converts mechanical energy into AC electrical power. | A machine that changes mechanical energy into electrical energy (AC or DC). |
| Current | Induces alternating current | Generate both AC & DC. |
| Magnetic Field | Rotating | Stationary |
| Input Supply | Takes from the stator. | Takes from the rotor. |
| Armature | Stationary | Rotatory |
| Output EMF | Alternating | Constant |
| RPM (Rotation per minute) | Wide Range | Narrow Range |
| Dead Battery | Do not charge | charge |
| Output | Higher | Lower |
| BASIS | AC MOTOR | DC MOTOR |
|---|---|---|
| Nature of the Input Current | Alternating Current is the main input power in the AC motor | Direct Current is the main input power in the DC motor |
| Supply Sources | Three-phase or single-phase power from the supply mains | Energy is obtained from batteries, cells, etc. |
| Commutation Process | Absent in AC motor | Present in DC motor |
| Supply Phase | Both single-phase and three-phase supply are used | Only single-phase supply is used |
| Number of terminals | There are 3 input terminals RYB. | There are two input terminals Positive and negative |
| Carbon brushes | No carbon brushes | There are carbon brushes in the DC Motor |
| Applications | Suitable for large and industrial applications | DC motor is used in small and domestic applications |
| Starting | AC Motor is not self-starting. It requires some external starting equipment | DC Motor is self-starting |
| Position of Armature | The Armature is stationary and the magnetic field rotates | The armature rotates while the magnetic field remains stationary. |
| Maintenance cost | Less expensive as compared to DC Motor | DC Motor maintenance is more expensive. |
