Correct Answer - Option 4 : recording instruments
Reluctance motor:
- The stator of the reluctance motor has the main and auxiliary winding
- The stator of the single-phase reluctance and induction motor are the same
- The rotor of a reluctance motor is a squirrel cage with some rotor teeth removed in certain places to provide the desired number of salient rotor poles
- The rotor needs no dc excitation
- It is self-starting machine and it rotates with constant speed
- It can operate on ac supply only
Reluctance motors can deliver very high-power density at low cost, making them ideal for timing devices and control apparatus. The other applications of reluctance motor are
- Signalling devices
- Recording instruments
- Phonographs
- Analog electric meters