YOU DECIDE IF YOU WANT TO BELIEVE AC IS GOOD OR BAD. I WILL JUST STATE WHAT I LEARNED AND SOME THINGS I FOUND WHEN I TESTED THEM.
First, as of now, this is my third website on vibration exercise. On my first site, I sold plenty of AC models when I didn't know about EMF, especially since none of the companies had any reference to it. How was I supposed to ask if I didn't know what it EMF was???
I am not going to say EMF is good or bad but I will let you decide based on my tetss I did which you can also do at home.
I wanted to see if the EMF exposure from the AC motors really was as harmful as I imagined. I already knew how EMF from cell phones was bad and it occurred to me that if hair dryers are known for high EMF, I wanted to see if these were even worse.
What I did was I had people stand near the vibration machines (not even stand on it but on the floor next to it while it was vibrating). Before I ever took my EMF meter out, I wanted to see what it was doing to the body. There was an Aura Photography booth at one of the expos. They take a picture of someone that shows before and after someone standing near or on the plate. The color of people standing near the high EMF models went from red to green. When they got back on it a second time and actually stood on it for 10 minutes, they went to yellow. VS DC - YOU DECIDE
What this means is that the EMF which puts a left spin on the molecules of the cells in the body, it lowers the voltage of the cells. When the photographer told me how it was lowering the vitality of the cells which was shown in the color changes, I knew the EMF was doing something bad.
I also went to Radio Shack and bought a cheap, 15 dollar battery tester. I went up to people at the health expo and had people pinch one of the red wires with one hand and the black wire with the other and see what their starting voltage was. I had them get on the machine for a few minutes and others just stand next to it. Sure enough, the voltage readings went down. As a rule, healthy children usually have a readout of 70 to 90 millivolts. Those with low energy usually have way less.
I did this with just bare motor speed with no one standing on it and also people standing on it. More EMF was produced when people stood on them. When I took my EMF meter when no one was on it much less EMF was read on the meter. I think it is a scam for companies to say that their machine has a low EMF readout when they compare it with no one on the freaking plate. With no workload, any high EMF motor will be less. The smaller, cheaper motors usually gave more EMF as they had to work harder and pull in more energy to do the same job as the larger horsepower motors.
I have studied that EMF may deteriorate the cartilages of our feet when we stand on the vibrating platform, our hands and palms if we do push ups, our hips if we sit on it. Also, another current big warning is that uncontrolled EMF and rich RF (Radio Frequencies) may cause bone cancer. I am sure that you heard the warning about the magnetic fields in the cellular phones that might cause brain cancer? Well, the magnetic fields on some of the AC motor platforms can be much stronger than those of the cellular phones. Most machines are loaded with those powerful EMF and RF and are exposing their customers and their trainers to a high risk! If you want ZERO EMF AND RF EXPOSURE, YOU MUST GET DC MOTORS, or at least a Low EMF AC motor.
Video 1 (now gone)
We had to take down our video of the person we had stand next to a AC motor machine and then get a picture (see above) to see if their aura changed. We did this twice when a very heavy person was on it, which made the motor work harder. Unfortunately, the manufacture has asked us to take down the video and we did. We are not hear to pick any fights with anyone.
Video 2 (again, we had to take it down)
This was a video of us interviewing senior engineering students at from a college. We asked them to explain the differences between AC and DC motors with power consumption, motor longevity, and EMF. This is where we learned more things about motors than the manufactures would tell us.
AC and DC motors both offer unique benefits and features that can make one or the other better suited for you.
AC MOTORS MAY BE BETTER BECAUSE. . .
* The are conventional and less expensive than DC motors.
* AC motors require hardly any maintenance and is preferred for models where the motor is
mounted where it is hard to take out or replace.
* AC motors are much smaller, lighter, but can make more noise
* AC motors may be better for high speed vibration machines since there are no brushes where
contact communication is not a problem
* Not good in humid places unless it has a corrosive proof enclosure. Many
motors do not have enclosures
* AC can push heavier weights at lower amperages and wattages
DC MOTORS MAY BE BETTER BECAUSE. . .
* DC motors are not as complex and have a single power converter to DC
* DC motors are usually less expensive for higher horsepower ratings.
* DC motors can adjust speeds without as much wear and tear
* DC motors don't often get as warm at the same loads
* DC motors can adjust speeds without as much wear and tear
* DC motors are better designed for continuous operation
* DC motors can give starting torques and accelerate speed at higher
* DC motors are less audible at the higher speeds
DC MOTOR WARNING:
Many companies still use the brush type motors as they are the cheapest DC motors to build. The disadvantage over time is that these carbon brushes that transfer electricity to the rotating part of the motor, the brushes eventually wear out over time and the result is a motor that stops.
Newer machines have DC brushless motors which having eliminated the brushes, it is more expensive to make and requires more expensive electronics to operate it. This results in a motor that will last a long time and has a dramatically reduced noise without these brushings.
Compare DC motor to AC motor
The one thing in common between AC and DC motors is that they both have a stationary part and a rotor.
The speed of a DC motor can be adjusted by increasing the voltage and is better for low power operations. DC motors don't heat up as much as they have added heat dissipation features which also allow lower operating speeds.
The size of an AC motor is much bigger compared to DC motor of the same torque power.
AC motors have a simpler design, but they work best at fixed speeds and cannot operate at low speeds, this is why most of the cheap vibration machines you see start at a high frequency, unlike ones that start under 10 hertz. The models that have digital speed controls that are AC powered are usually more expensive as it requires lots of control features and also the higher the speed of an AC motor, the more Radio frequencies (RF) it produces.
From the engineer: From my notes.
AC or DC motor:
This the type of current used to power the motor that produces the vibration. AC means "Alternating Current" and DC means "Direct current" (not alternating).
There is no hard and fast rule that one is better than the other. There are good and poor versions of each of these motor types, so it is unreasonable to make a comparison on this basis. The type of motor is dictated by what the designer wants to achieve in terms of control of the vibration and the type of vibration. AC motors are generally less expensive and more durable but are more difficult to control. This used to be an obstacle, but recent innovations in electronics have made it very easy to control the speed of an AC motor.
Bottom line: There is no implicit advantage or disadvantage of AC vs DC. However, cheap, "brushed" DC motors should be avoided.
I am sick of every company saying they have the best one that I had to build this site. I will not sell machines that I do not approve of. i will give honest advice and reasons for my recommendations based on my research.
Simply upgrading your motor to a DC Brushless motor can cut your electrical costs in half.
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