....Up to 300 rpm (3 phase motor) and what sort of efficiency could I expect under normal conditions with a small load? Thanks
I assume you're talking a single phase motor. Too bad, three phase motors are more efficient.....Up to 300 rpm and what sort of efficiency could I expect under normal conditions with a small load? Thanks
wiki said:Full load motor efficiency varies from about 85% to 97%, related motor losses being broken down roughly as follows:
Various regulatory authorities in many countries have introduced and implemented legislation to encourage the manufacture and use of higher efficiency electric motors. There is existing and forthcoming legislation regarding the future mandatory use of premium-efficiency induction-type motors in defined equipment. For more information, see: Premium efficiency and https://en.wikipedia.org/w/index.php?title=Copper_in_energy_efficient_motors&action=edit&redlink=1 [Broken].
- Friction and windage, 5% – 15%
- Iron or core losses, 15% – 25%
- Stator losses, 25% – 40%
- Rotor losses, 15% – 25%
- Stray load losses, 10% – 20%.