Three Phase Inverter: Difference between revisions
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Brushless, brushed, AC, and DC - all these are different | Brushless, brushed, AC, and DC - all these are different | ||
==Brushless AC (Induction)= | ==Brushless AC (Induction)== | ||
Induction motors are brushless - [https://www.google.com/search?q=do+induction+motors+have+brushes&oq=do+induction+motors+&aqs=chrome.0.0j69i57j0l6.3982j0j4&client=ubuntu&sourceid=chrome&ie=UTF-8] | Induction motors are brushless - [https://www.google.com/search?q=do+induction+motors+have+brushes&oq=do+induction+motors+&aqs=chrome.0.0j69i57j0l6.3982j0j4&client=ubuntu&sourceid=chrome&ie=UTF-8] | ||
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#More efficient | #More efficient | ||
#Higher power factor - better aligment of applied power to used power - better coordination of windings with power application. | #Higher power factor - better aligment of applied power to used power - better coordination of windings with power application. | ||
==Brushed AC Motors: Universal Motors== | |||
*Can run on AC or DC. [https://en.wikipedia.org/wiki/Universal_motor] | |||
*Only 30-75% efficient, with 30% for small ones. | |||
=More= | =More= | ||
Revision as of 21:14, 14 June 2020
Introduction
Brushless, brushed, AC, and DC - all these are different
Brushless AC (Induction)
Induction motors are brushless - [1]
3 phase motor control has significant advantages over 1 phase in AC induction motors:
- Self-starting
- More efficient
- Higher power factor - better aligment of applied power to used power - better coordination of windings with power application.
Brushed AC Motors: Universal Motors
- Can run on AC or DC. [2]
- Only 30-75% efficient, with 30% for small ones.
More
- At each point of time, 3 phases are active, but offset by 120 degrees:
https://www.youtube.com/watch?v=l60p4G7Bdi0
There is a 60 degree dead spot in the 120 degree (instead of 180 degree) mode of operation, allowing time for commutation. Makes sense - that could allow for energy saving in transition as commutation is occuring (by turning power off)
- In the Colombian paper, the coils are run 60 degrees out of phase.
https://www.emworks.com/ckfinder/userfiles/files/Axial%20Flux%20Motor.pdf
- How do you control a motor with 3 phase power?