When you lower the voltage on certain motor types, shaded pole for example, the efficiency can decrease in such a way that more heat is generated. This is a completely different type of motor that of course doesn't behave that way. It has an armature field and commutator, much like a DC motor with permanent magnets (these will also run on DC too), so your practical test is a great way to demonstrate that the myth really is a myth!
I knew you were a mathematician from a previous video of yours. I had thought "engineer" from your mechanical talent and careful use of wording. The two fields do overlap. Some years ago i borrowed a college level book on antennas. It was written, probably eighty percent or more in math which made me realize that math in itself is a language and discipline, separate from all others.
@@richardsobeck What make sense but is still aggravating is that my degree says "BA" (Bachelor of Art). Yup, Math is considered an art, like painting. My senior year in college involved classes that had problems to solve that had multiple correct answers and multiple wrong answers, you merely had to "prove your case" as it were. Maybe I should've been a lawyer.
Excellent test & video. Having watched many Kirby related videos on TH-cam lately, it’s interesting to note how many people don’t adjust the height correctly resulting in the brush roll being too close to the carpet; all taking its toll on the machine. Great point about the speed switch being a ‘finger’ switch, not a toe/foot switch. Another well done video. Thank you.
I love the speed switch, and wish Kirby would continue to offer the feature. I have heard that the overheating issue arose from users keeping the machines on low speed while using the shampooer.
Glad someone finally tested this “myth” and busted it. I always use my Diamond Edition in low speed for my rug and door mat and I’ve never had any issues. Ive never understood why people thought the speed switch caused these things to fail. I have heard that they can fail if you use the shampooer with it since the shampooer puts more strain on the front shaft.
Just bought this thing off eBay for 74 dollars. So this machine will not be damaged even by using it on a low speed for shampooing and floor polishing too I believe? As some people claim it does for some reason. 🤔
My Kirby Diamond just started having a burning smell. I googled Kirby overheating and your video came up. The Kirby Diamond is the best Kirby ever made.
This myth is totally busted now. Why other vacuums can have variable motor speed and they are fine. Why Kirby would be exception. It isn't like this test shows. I have one suggestion for your next test. Measure multi cyclonic bagless vacuum with and without the bin. What I have noticed when I run my Dyson DC40 without the bin motor can draw MUCH more air trough it. When the bin is on motor rpm's rise a lot and it probably runs hotter. Would that be the reason why bagless vacuum motors usually fail far sooner than the bagged vacuum motors. Just my guess.
Back in 2018, I did a series of videos called "raw airflow and suction tests". th-cam.com/video/Atge6ZnVBEY/w-d-xo.html I compared a DC41 to a DC65 and discovered that the entire system essentially "eats" about half the airflow and half the suction. For example, 120" and 120 CFM at the motor drops like a stone to 60" and 60 CFM at the nozzle. That kind of load on any motor will produce a drag "load" that will dramatically increase the internal operating temperature.
If their leaving it on low speed and really lugging the motor down for long periods of time that will cause a motor to run hotter. (Lower speed less power easier to overload the motor) just a thought.
was the diamond the only model with two speeds? id still prefer a sentria two but this two speed feature would be nice. dont see how less power draw correlates to higher heat. that goes against everything ive ever learned about science and electricity.
Is fun at most people totally forget the machines already operates on normal speed when the nozzle is attached. Then on a higher speed when the hose is attached. That long arm on the side presses the high speed switch. Then you have the benefit of the much lower speed from the delicate switch. All the delicate speed switch does is lower from not So speed to low speed. So really this Kirby is only three speeds. High=hose, normal = carpet nozzle, and finally Low=delicate switch activated. Hence why Kirby doesn’t call it high and low they refer to it as normal and low.
Good test,but would it make a difference with the brush head lowered to the carpet? Or even repeat the test while actually cleaning carpets. Not being disrespectful to you in any way,or the tests you have already carried out😀
When you lower the voltage on certain motor types, shaded pole for example, the efficiency can decrease in such a way that more heat is generated. This is a completely different type of motor that of course doesn't behave that way. It has an armature field and commutator, much like a DC motor with permanent magnets (these will also run on DC too), so your practical test is a great way to demonstrate that the myth really is a myth!
Whole house clean full Kirby Diamond Edition Think you VaLab
Did that back in October. It's in the Diamond Edition playlist.
Trying to prove or disprove anything is always difficult. Your approach, as always, seems best to me.
As a degreed Mathematician with heavy Physics, proofs are what I live for. 👍
I knew you were a mathematician from a previous video of yours. I had thought "engineer" from your mechanical talent and careful use of wording. The two fields do overlap.
Some years ago i borrowed a college level book on antennas. It was written, probably eighty percent or more in math which made me realize that math in itself is a language and discipline, separate from all others.
@@richardsobeck What make sense but is still aggravating is that my degree says "BA" (Bachelor of Art). Yup, Math is considered an art, like painting. My senior year in college involved classes that had problems to solve that had multiple correct answers and multiple wrong answers, you merely had to "prove your case" as it were. Maybe I should've been a lawyer.
I guess that's why our state and federal budgets are always right.
Excellent test & video. Having watched many Kirby related videos on TH-cam lately, it’s interesting to note how many people don’t adjust the height correctly resulting in the brush roll being too close to the carpet; all taking its toll on the machine. Great point about the speed switch being a ‘finger’ switch, not a toe/foot switch. Another well done video. Thank you.
I love the speed switch, and wish Kirby would continue to offer the feature. I have heard that the overheating issue arose from users keeping the machines on low speed while using the shampooer.
Glad someone finally tested this “myth” and busted it. I always use my Diamond Edition in low speed for my rug and door mat and I’ve never had any issues. Ive never understood why people thought the speed switch caused these things to fail. I have heard that they can fail if you use the shampooer with it since the shampooer puts more strain on the front shaft.
This video is from December 2019, about two years ago now. I was delighted to make it and bust a common myth about this machine.
@@VacLabMy Kirby Ultimate G Diamond Editon Never Overheats On Low And High Speed
A GREAT subject to undertake for your video channel and Kirby fans/critics
Just bought this thing off eBay for 74 dollars. So this machine will not be damaged even by using it on a low speed for shampooing and floor polishing too I believe? As some people claim it does for some reason. 🤔
As this video proves, it won't overheat as long as it's well maintained.
My Kirby Diamond just started having a burning smell. I googled Kirby overheating and your video came up. The Kirby Diamond is the best Kirby ever made.
This myth is totally busted now. Why other vacuums can have variable motor speed and they are fine. Why Kirby would be exception. It isn't like this test shows.
I have one suggestion for your next test. Measure multi cyclonic bagless vacuum with and without the bin. What I have noticed when I run my Dyson DC40 without the bin motor can draw MUCH more air trough it. When the bin is on motor rpm's rise a lot and it probably runs hotter. Would that be the reason why bagless vacuum motors usually fail far sooner than the bagged vacuum motors.
Just my guess.
Back in 2018, I did a series of videos called "raw airflow and suction tests".
th-cam.com/video/Atge6ZnVBEY/w-d-xo.html
I compared a DC41 to a DC65 and discovered that the entire system essentially "eats" about half the airflow and half the suction. For example, 120" and 120 CFM at the motor drops like a stone to 60" and 60 CFM at the nozzle. That kind of load on any motor will produce a drag "load" that will dramatically increase the internal operating temperature.
If their leaving it on low speed and really lugging the motor down for long periods of time that will cause a motor to run hotter. (Lower speed less power easier to overload the motor) just a thought.
Nope, not at all. Still just a myth. The motor speed doesn't even decrease that much anyway.
was the diamond the only model with two speeds? id still prefer a sentria two but this two speed feature would be nice. dont see how less power draw correlates to higher heat. that goes against everything ive ever learned about science and electricity.
Well technically, it has 4 speeds but yes, I know what you meant and it was. 😁
@@VacLab its a two position switch, how does it have four speeds?
@@Billy_Darley remember the high speed "hose mode". And then 2x2=4.
Is fun at most people totally forget the machines already operates on normal speed when the nozzle is attached. Then on a higher speed when the hose is attached. That long arm on the side presses the high speed switch. Then you have the benefit of the much lower speed from the delicate switch. All the delicate speed switch does is lower from not
So speed to low speed. So really this Kirby is only three speeds. High=hose, normal = carpet nozzle, and finally Low=delicate switch activated. Hence why Kirby doesn’t call it high and low they refer to it as normal and low.
Good test,but would it make a difference with the brush head lowered to the carpet? Or even repeat the test while actually cleaning carpets. Not being disrespectful to you in any way,or the tests you have already carried out😀
It wouldn't fundamentally change that a temperature difference exists. Lower motor speeds generate less heat, not more heat.
Is it true that running it in low speed for to long can ruin the motor
Umm, this video addresses that. Did you not watch it in its entirety?
VacLab I did just don’t understand things as well as other people do some
@@evansimmons2001 running this machine on low speed doesn't do any additional damage.