Structure of enclosed motor
Taking the ordinary B3 installation motor as an example, the basic characteristics of the motor are: horizontal, base with foot, two end cap bearings, single shaft extension (can also be made into double shaft extension if necessary), with internal and external fans. The base is made of cast iron with heat sink on the surface to expand the heat dissipation area and improve cooling conditions. The top of the base has lifting eyebolts for lifting, and the bottom has two small round holes for draining condensate. From the transmission end, there is a square outlet box on the right side of the base for introducing the power cord. The inner cavity of the base is cylindrical and has no longitudinal ribs, so that it has good contact with the stator core, which is beneficial to heat dissipation.
The stator core buckle piece is axially fastened in the dovetail groove at the outer circumference thereof, and the structure is simple, and the outer circumference of the iron core is almost completely in contact with the inner circle of the machine base, which is favorable for heat dissipation. This structure can be externally pressed.
The aluminum cage rotor is matched with the shaft by a heat jacket (the cold shaft can also be assembled after the shaft is knurled), and the end ring and the inner fan blade are integrally formed, which simplifies the process and improves the reliability. A small column for placing the balance block when the balance is balanced is also cast on the end ring. The function of the inner fan is to accelerate the circulation of hot air inside the machine to better exchange heat with the base and the end cover. The outer fan is a radial centrifugal fan made of aluminum or plastic, and the hood is screwed to the frame.
The front and rear end caps are identical and the bearings are single row radial ball bearings.
