Posted by:
roger wilson
(---.hsd1.mn.comcast.net)
Buddy,
There are several different types of motors that are used for slow speed drying.
1. Perhaps the most common AC motor is the timing motor. Essentially ,this is the same motor that is used in clocks, timers, grills, and microwaves. This type of very low power motor which generally works very well does not get hot at all.
2. Another very common type of motor that is used for drying, primarily because of its low price is the shaded pole AC motor. If you have one of the larger motors with a single large turn of copper wire or a copper band on one side of the motor, this is a shaded pole motor.
Although this motor is used for drying because of its low price, it is actually an intermittent duty motor. It is supposed to be used for one minute on and 5 minutes off. If this type motor is used for continuous duty drying it will get hot enough to boil water or fry an egg. However, the motor will continue to run. If you do have this style motor, it is to your benefit to place a small cooling fan beside the motor to blow air across the motor during use to keep the temperature down.
3. Another motor that is used for drying is about the same size as the shaded pole motor but it does not have the heavy wire or copper band on one side of the armature. Rather, it will have a capacitor across the voltage supply leads which help supply the necessary starting torque for the motor. This is a very good motor for drying with good size, only a bit more expensive than the shaded pole motor and runs very cool.
The reason that the shaded pole motor runs hot is that voltage continues to circulate in the shorted heavy starting winding on the motor even when running. So, this is exactly the same way that a toaster works. i.e. a coil of wire with voltage on both ends. So in continuous use, the shaded pole motor emulates a toaster and gets nearly as hot as a toaster in continuous duty with no cooling fan on it.
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There are other motors that may be used for dryer motors as well. A motor that is being used more and more is a low voltage DC gear motor. These motors are inespensive to purchase, run on low safe DC voltage and run both quietly and without any excess heat.
One simply picks up the correct low voltage plug in DC power supply to power one of these motors.
I will give a few examples of drying motors in the following links:
This motor from Flex coat and sold by Mud hole is a common motor that uses the classic timing motor. 6 or 18 rpm, 110V ac supply and runs cool and quiet.
[
www.mudhole.com]
An example of a shaded pole motor which works very well, is very strong, but if used continuously needs an external cooling fan. Some of these motors have an extended shaft on the back of the motor which is fitted with a cooling fan.
[
www.aliexpress.com]
An example of a high quality low rpm Capacitor start AC motor:
[
www.electronicsurplus.com]
An example of a very good 12 volt DC low rpm gear motor:
[
www.amazon.com]
An example of a 12 volt DC power supply that may be used to power a 12 volt gear motor as listed above:
[
www.amazon.com]
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If you have a dryer motor that is getting hot for you, here is an example of a 110v AC Muffin fan that you can use to cool the motor:
[
www.amazon.com]
There are also small 4 inch personal AC plug in fans that can be used as well.
These are nice 4 inch quiet fans with stands that work well to set along side a drying motor to keep it cool:
[
www.bedbathandbeyond.com]
Good luck and may you always be cool!!
