Motor Types and Parts
Rotor: 2 Types
- Squirrel cage rotor
- Iron core
- Embedded conductor
Stator parts
- Coil winding
- Shading band
- Stator pole
- Inside coil
- Outside coil
- Bearings…ball or sleeve
- Frame…totally enclosed/vented/hermetic
Parts of the Motor
- Fan
- End bell
- Electrical connection box
- Winding
- Stator
- Rotor
- External shaft
- End bell
Motor Enclosures
- Totally open motor
Vents on sides + end
- Modified totally open motor
- Open drip-proof motor
- Drips of liquid will not enter
- Totally enclosed (non-vent motor)
- Generally used when subjected to moisture
Sleeve Bearings
- Lubricated by coil…..SAE 20, 30 0r refrigeration oil 200 or 300
- Wicked system…consisting of a cotton or wool with in an oil reservoir
- Slip Ring….consisting of brass clip ring on the motor shaft as the shaft turns the ring turns slowly picking up oil from an oil pocket.
Ball Bearings
- Lubricated by grease. These may be sealed or serviceable
Oil-less Bushing
- A shaft passes through a sintered (porous bronze) bushing. The bushing has been impregnated with oil at the factory considered to be permanently lubricated. Used on low Hp. Fan Motors
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