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Results tagged with three-phase
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user 740
AC power with three legs run 120 degrees out of phase
22
votes
Why is three-phase offset by 120 degrees?
Being 120 degrees apart makes the phases balanced such that power transfer at any instant is a constant. If you had phases 'closer together' as you suggest, there wouldn't be any real advantage over …
- 19.3k
2
votes
Accepted
High power three phase ac motor controller
You might investigate 'insulated gate bipolar transistor' (IGBT) technology. The high power 3-phase motor drives I've encountered (several 100's of volts x upwards of 100A) have been built around IGBT …
- 19.3k
2
votes
Shortcircuited motorcycle alternator leads to RPM proportional losses?
The same constant that relates machine voltage to RPM also relates its current to the torque. If you can determine how much current is due to the 'shorting', then that current should reflect back mech …
- 19.3k
15
votes
Accepted
How does a three-phase transformer work with phases sharing a common core?
You are correct that in each winding, the magnetic field varies in phase with the current in the windings. What you're having a problem with is the concept of flux being 'annihilated' at where the cor …
- 19.3k