Radio frequency is a part of nature. Different frequencies produce different types and lengths of electromagnetic, or EM, waves. Light rays, heat rays and radio waves are all part of naturally occurring radio frequencies. When we think of radio waves, we most likely consider communication devices, such as cell phones, walkie-talkies, televisions and radios. EM waves are also created when we use an electric motor, turn on the ignition in your car, when the gasoline engine is running, even when we use the computer. Other items that produce EM waves include medical equipment, lighting and various household appliances.
What is Electromagnetic Field, or EMF?
EMF, or electromagnetic field, is produced by electrically charged items that are in motion. It is a very real physical field that can affect objects within the radius of that field. Theorists, some of them anyway, believe that these electromagnetic fields, which do have low levels of radiation, can adversely affect the body, particularly the brain.
Wireless phones, as well as other select devices have been theorized to specifically target the brain causing a number of issues. These include headaches, particularly migraines, chronic fatigue, tinnitus (affects the ear), vertigo (affects balance), seizures, epilepsy, autism, and even brain tumors. Some also believe these waves can cause DNA mutations in the fetuses of pregnant women, causing birth defects. At present there is considerable controversy as to whether the waves are a true threat.
EMF Emitted From DC Motors
DC motors come in two types, brushed and brushless. The brushed motors are usually not as efficient, tend to wear out more quickly and need more frequent servicing. These are less expensive to make and therefore less expensive to buy. Brushless motors, or BLDC motors, are much more efficient. The BLDC motors produce more torque, both per weight and watt, and are more reliable as well as quieter. The lack of brushes also gives them a longer lifespan. BLDC motors also produce less electromagnetic interference, or EMI. If you have a sensitivity to these waves, a brushless or BLDC motor would be the way to go. Since these motors are more efficient all around, it is still a better choice for those not so afflicted.
EMF Emitted From AC Motors
AC motors also emit EMF waves, but in this case they are called back-EMF waves. Motors work like generators, only backwards. The back-EMF is not instantly generated when a motor is turned on. Rather, the EMF creates a magnetic flux, part of Lenz’ Law. This flux resists the changes created by the motor and tends to slow the motor down by reducing the available current. The EMF wave increases as the motor speeds up. If there is no load on the motor, the EMF can become just as powerful as the voltage input. These EMF waves, by slowing the motor down, decrease the efficiency of the motor, while at the same time requiring more power for that motor to operate, ultimately wasting energy.
How EMF Can Affect You
Basically, all devices that use electricity have the ability to create EMF waves. The difference is in how much EMF is produced. AC motors, as a whole, do tend to create more EMF waves. Even so, machines with AC motors emit just slightly more than those with a DC motor.
High-end Vmax Machines that have the AC motors do have very low EMF emissions. You may opt to go for one of these machines while purchasing an EMF meter to go along with it. That way you will know exactly how much of these waves you are being exposed to.
But, if you are very sensitive to EMF waves, you want to do all you can to avoid them. In this case choosing a DC motor, which does emit fewer waves, may be the best choice.
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