Traction Motor of Locomotive

 
How to do Backlash measurement of pinion-gear ? 

IN TM shop was   following problems can be analysed:-.

When three teeth match, filler gauge is used to make one side gap NIL, then clearance between other side gives the backlash.

Pinion Draw measurement to be inspected.

a)    Color matching ( more than 90% ensured) sould be done for proper interference between two surfaces.

b)   Pinion inserted.

c)    Pinion drawn out , induction heated and again inserted.

d)   Pinion draw= ©-(b)

Lateral and longitudinal bogie clearances can be measured as in above picture .

Shown in above: Modified stator clamps to hold bracing ring which protects overhang portion from vibrations .

Greasing nipple and bearing cover groove matching is necessary for proper greasing in HITACHI motors.  

The bearing cover groove , if not in matching location, results in blockage of path. This cover is supposed to be shrink fit but is press fitted in the shop.

End Brazing and welding in Traction Motors

Brazing of the end rings and MIG welding  was inspected  in the TM shop.

In addition to MIG welding, Induction brazing and Zarconium welding ( stampings) are the other two types of end-ring preparation methods.

Almost 100 three phase Traction Motors are waiting for production for want of RTV622, which is applied in the terminal box as well as inside the winding.

Process of Pole terminal brazing was inspected in the shop.

Some bolts in the TM were found to be just punched of the make, unlike the standard practice of embossing. This was instructed to be recorded as Non-Conformity.



 

Provision of U Nomex paper at the ends of coils in three phase Traction Motor was inspected in the shop.

Making of Traction Motor

Machining of three phase TM shaft was inspected today in the shop.

Two items are received in TM shop from steel foundry as small foundry. Both of these are among

70 off loaded to trade.

Machining of commutator spider was inspected. It was seen there were lot of surface defects in the spider hub.

More on Hitachi TM Manufacturing

Audit of 2  WIs was done today in TM Shop. Report is as follows:-

Polyglass Binding ( W 23.003):-

Points noticed:-

• Varnish/Solvents KS707, WSY 285  and S30 being used in the shop mentioned in the WI are being checked of expiry date.
• EGY Glass Twine Chord 2mm dia mentioned in WI point no 3.9 is being followed at all.
• PG banding sequence mentioned in WI point # 3.6 is being followed. PE side was being done before CE side

• In place of EGT , ETT of size ( 0.18 x 25 ) was being used , this size is not mentioned in the WI.
• Jig INJ-030 was being for calibration
• Tape Tension measuring machine was being sent for calibration.
• Record for baking done for 12 hours was being found.

Balancing of HITACHI Armature  ( W23.005):-

Points noticed:-

• Balancing machine was being sent for calibration.

Other Shop Inspection:-

Loco no WAG-7 48427 due for dispatch today was inspected. NC of pipe passing holes, which was pointed out in earlier locos too (reported in my inspection report dated 11.2.2012 ), was not attended.