Star and Delta motor field winding configurations are not efficient. - Page 1
Forum section: electronics / general

author: Peter Taylor
author_rank: Regular Contributor
timestamp: June 13, 2022, 01:49:49 pm
content: The three field windings displaced by 1/3 of a revolution of an electronic motor can be configured in the following three ways.Star (where an end of each winding is connected in common and the other three make four external connections).This requires that one winding be off in each revolution, giving a power to weight ratio of 2/3 of the maximum.Delta (where the three windings are connected in series and the junctions give three external connections).This requires that one winding be off in each revolution, giving a power to weight ratio of 2/3 of the maximum.Other (where the ends of each winding make six external connections).This allows three windings to be on at all times, giving a maximum power to weight ratio.The common consensus in electronic motor control is to use Star or Delta configurations.The third configuration has a 1/3 higher power to weight ratio.This article explains why this rarely appears in a google search for 'electronic motor control'.It is cheaper on a commercial scale to manufacture Star and Delta configurations because they require fewer half h bridges and external copper connections.The Other configuration requires three full h bridges and six external copper wire connections, and costs more.In reality, the most efficient design has been hidden by a ruling class who's motivation is greed, not elegance (beauty and simplicity in design).

author: rob77
author_rank: Super Contributor
timestamp: June 13, 2022, 02:10:36 pm
content: Quote from: Peter Taylor on June 13, 2022, 01:49:49 pmwhat the actual f**k are you talking about ?in a 3phase system you never have a "winding OFF" , you have 3 phases 120degrees apart and none of them if "OFF" in any point in time.

author: Brumby
author_rank: Unknown
timestamp: June 13, 2022, 02:16:35 pm
content: Quote from: Peter Taylor on June 13, 2022, 01:49:49 pmFascinating.Please show your working.

author: Peter Taylor
author_rank: Regular Contributor
timestamp: June 13, 2022, 02:27:49 pm
content: The article mentions a h bridge. Does this imply a switched controller, or a linear one ?I am not teaching basic theory. You show the reasoning.

author: Brumby
author_rank: Unknown
timestamp: June 13, 2022, 02:51:48 pm
content: Quote from: Peter Taylor on June 13, 2022, 02:27:49 pmWhat article?QuoteH bridge topology is not hard to understand. Try Google.QuoteThat's "Trolling 101". Come back when you understand some basics about H bridges, 3 phase and how they relate to motor operation.Oh ... and don't forget the elephant in the room: Physical construction and all that that entails.

author: Peter Taylor
author_rank: Regular Contributor
timestamp: June 13, 2022, 03:15:51 pm
content: I don't come here to ask questions, but to make statements.An article is a statement.

author: Siwastaja
author_rank: Super Contributor
timestamp: June 13, 2022, 03:27:59 pm
content: Nothing you wrote made any sense, to the point it's not even correctable. Maybe try do a literature research how an AC motor works and try again.

author: wraper
author_rank: Unknown
timestamp: June 13, 2022, 04:01:33 pm
content: Quote from: Peter Taylor on June 13, 2022, 03:15:51 pmAnd of course no article was shown

author: wraper
author_rank: Unknown
timestamp: June 13, 2022, 04:03:50 pm
content: Quote from: Peter Taylor on June 13, 2022, 01:49:49 pmThe most common claim when you try to sell some BS.

author: BrokenYugo
author_rank: Super Contributor
timestamp: June 13, 2022, 04:36:47 pm
content: Yes, and I have a secret carburetor that will give 100 mpg installed in a full size 1970s Detroit built V8 car.

author: Gregg
author_rank: Super Contributor
timestamp: June 13, 2022, 04:42:42 pm
content: This troll attempt belongs in the Dodgy Tech section as a neighbor with the nonlinear plasma troll.At least nonlinear plasma makes a feeble attempt to justify his outrageous claims.

author: Benta
author_rank: Super Contributor
timestamp: June 13, 2022, 04:50:27 pm
content: Hahaha! Great entertainment!

author: andy3055
author_rank: Super Contributor
timestamp: June 13, 2022, 05:08:35 pm
content: "... not teaching basic theory "One must first understand basic theory to make "statements" ... which is your own declaration! Why do you come to a public forum like this where there are learned people and try to convince them and still argue to make a fool of yourself?

author: eugene
author_rank: Frequent Contributor
timestamp: June 13, 2022, 05:38:13 pm
content: The OP has confused simple methods of driving BLDC motors with 3 phase AC motors. That, in itself, is neither crime nor sin. The hang is that he is unwilling to learn but insists on "teaching."OP, your only contribution to EEVBlog is starting three bullshit threads. You need to close your mouth and just listen. Not everything that pops into your head should be shared on a public forum.