Siemens induction motors- generators cgii 用户手册

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Sleeve Bearing – 500, 580, 680, 800 Frames 
Access to the motor interior can be gained by 
removal of the upper half of the horizontally split 
bearing bracket. 
 
1.  Remove the parting bolts at the horizontal split. 
2.  Remove the bolts at the outer circumference of 

the upper half of the split-bearing bracket. 

3.  Pull the upper bracket away from the face of the 

frame and remove bracket. 

The entire procedure can be done without disturbing 
the bearing enclosure or coupling alignment of the 
motor to the load.  The split-bearing capsule is held 
together by bolts. 
 
Sleeve Bearing - 1120 Frames 
Access to the motor interior can be gained by 
removal of the bearing bracket as follows: 
 
1.  Remove the parting bolts at the horizontal split. 
2.  Carefully remove the top half of the bearing 

housing by lifting it straight up and then pull it 
away from the lower half. 

 
Air Deflector 
Air deflector construction depends on the type and 
size of motor. The following conditions will be found 
when accessing the motor interior; 
1.  500 frame motors have air deflectors that are 

retained in the fit between the bearing housing 
and the stator yoke. Such air deflectors will be 
removed with the bearing housing or can be 
easily removed from the stator yoke after 
bearing housing removal. 

2.  580, 680, 800, or 1120 frame motors have air 

deflectors which are mounted with bolts to the 
stator yoke. 

3.  Air deflectors on sleeve bearing motors are 

horizontally split. 

 
Cleanliness 
The exterior should be kept free of oil, dust, dirt, 
water, and chemical.  It is particularly important to 
keep the air intake and exhaust openings free of 
obstructions. 
 

If equipment is operated intermittently in very damp 
locations, it should be protected by space heaters. To 
retard corrosion, grease all machined fits when the 
unit is reassembled after a maintenance check. 

 

 
Loading 
Overloading causes overheating and reduces 
insulation life.  A winding subjected to a 10°C 
temperature rise above the maximum limit for its 
class may have its insulation life halved. 
 
Underloading a motor is improper as it lowers the 
motor power factor and efficiency which results in 
higher power cost. 
 
Temperature 
Electrical apparatus operating under normal 
conditions becomes quite warm.  Although some 
places may feel hot to the touch, the unit may be 
within limits.  If checking total temperature by 
winding resistance or imbedded detector (RTD), the 
total temperature should not exceed the following: 
 
When operating at full load: 

 

 
When operating at 1.15 service factor load: 

 

 
These temperatures represent the maximum 
temperature for each class of insulation and include 
a 40°C ambient temperature.  Operation above 
these temperatures will result in reduced insulation 
life.