Is a DC motor better than an AC one? - Motorhome Forums, Motorhome Discussion, Motorhome Chat

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post #1 of 7 (permalink) Old 30-07-2019, 20:11 Thread Starter
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Is a DC motor better than an AC one?

I'm looking at buying a treadmill and the manufacturer (Reebok) makes two models of a virtually identical treadmill - one is called the SL8.0 AC and the other SL8.0 DC. Other than different screen displays, the only difference is the motors. The AC motor is 4.0bhp whereas the DC one is 3.0bhp but speed, incline is the same between the two machines. The AC one seems to be cheaper although that goes against the logic of more horsepower being better. I have though read that a DC motor is more efficient than an AC one.

Anyway I can't decide!

Peter
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post #2 of 7 (permalink) Old 30-07-2019, 21:05
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Is conversion integral in the AC one Peter? As far as I know all motors are DC and there would have to be a conversion from an AC source in the AC one. Possibly where the loss in efficiency occurs?
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post #3 of 7 (permalink) Old 30-07-2019, 21:07
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Oops just read about induction motors

https://www.explainthatstuff.com/induction-motors.html
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post #4 of 7 (permalink) Old 30-07-2019, 21:31 Thread Starter
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Thanks Dick - although I'm not sure I'm much the wiser about which one to choose!

I understand though about the concept of carbon brushes wearing out. One of our washing machines packed up and I somehow deduced it was the brushes that had worn so ordered some new ones off ebay (about £7). With the help of a YouTube video (along with much sweat and effort), I replaced the brushes and all was good....for about six months! The machine stopped working again and I pulled it out to find a pile of carbon underneath! Lesson learnt I went to a washing machine repair shop and asked him what brushes he used. I then paid him £25 for a set - that was 7 or 8 years ago and the machine is used most days when we are at home and is still going well. Fatal words probably!
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Peter
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post #5 of 7 (permalink) Old 31-07-2019, 06:57
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Son works for a company that supplies gym sports kit have messaged him to ask his tech guys at work today.

Terry

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post #6 of 7 (permalink) Old 31-07-2019, 08:47
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Peter, PM sent.

Terry

I'm a Euro Unionist, Testiculi ad Brexitam

Brexit: the incapable in pursuit of the unobtainable to satisfy the delusional. (Edwin Hayward)

In the land of the blind the one-eyed man is king.
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post #7 of 7 (permalink) Old 31-07-2019, 11:14
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Originally Posted by dghr272 View Post
Peter, PM sent.

Terry
Don't keep it a secret...unless it's personal of course

Ted.
I try and state simple facts in a nice way.
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