motor efficiency (eta) and power

ron_van_sommeren · 09 giugno 05, 00:50

Higher efficiency means that the motor is able to handle more power before reaching the temperature it had as a low efficiency motor.
An example:
Say the motor has an efficiency of 70% and it can handle 50Watt input. That means it can get rid off 0.3*50=15Watt excess heat. Now, by cramming in thicker wire, efficiency increases to 75% (we're being optimistic here), the ability to lose those 15Watts has not changed. This means the motor now can handle 60Watt before it hits the 15Watt (0.25*60Watt) losses mark. An efficiency increase of 5% gives an increase in power of 20%. That's why efficiency plays such an impertant role, in any motor design: efficiency governs maximum power.

**Hannibal** · 10 giugno 05, 17:12

Ohh yessssssssss

10 giugno 05, 17:12	#2 (permalink) Top
Hannibal Adv Moderator Data registr.: 27-11-2003 Residenza: Roma Messaggi: 7.434	Ohh yessssssssss __________________ un giorno mi librerò in volo sul mio Diavolo dalla coda biforcuta e allora attenti a voi... Hannibal alias l'Afrocubano

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09 giugno 05, 00:50	#1 (permalink) Top
ron_van_sommeren User Data registr.: 26-12-2003 Residenza: near Nijmegen, the Netherlands Messaggi: 484	Higher efficiency means that the motor is able to handle more power before reaching the temperature it had as a low efficiency motor. An example: Say the motor has an efficiency of 70% and it can handle 50Watt input. That means it can get rid off 0.350=15Watt excess heat. Now, by cramming in thicker wire, efficiency increases to 75% (we're being optimistic here), the ability to lose those 15Watts has not changed. This means the motor now can handle 60Watt before it hits the 15Watt (0.2560Watt) losses mark. An efficiency increase of 5% gives an increase in power of 20%. That's why efficiency plays such an impertant role, in any motor design: efficiency governs maximum power.