Traction Motors fore Locomotives

Audit of following Work Instructions was done in TM Shop. Report is as follows:-

Welding of Stator Assembly ( W 21.402):-

Points noticed:-

• Lifting fixtures mentioned in para 3.2 of this WI is not in use. WI needs modification
• Cleaning of the fitting bars as mentioned in para 3.3  should be done.
• 6 mm measurement of the welding material as mentioned in para 3.11 should be done.

• Cross pieces cleaning as mentioned in para 3.20 should be done.
• 16 mm weld deposition measurement as mentioned in para 3.23 should be done

• This WI is not complete. In practice Stoppers and accessories bars are being used which should be mentioned in WI.

• Most of the 3 phase TM stator work is carried out in HMS except stacking. Small work of stacking can also be carried out in HMS as this will save transit time ( from TM shop to HMS).

Reports from sheds:-

Rayapuram Shed :- has emailed CLW loco failures for the past 10 months.Same has been forwarded to CEE(Loco).

Three Phase Traction Motor

Audit of following Work Instructions was done in TM Shop. Report is as follows:-

Assembly of short circuit cage( W 21.404):-

Points noticed:-

• Initial insertion of 4 copper bars as mentioned in Para 3.5 of this WI is to be followed in induction brazed rotors as evident from above snap.

• Press punching as mentioned in para 3.10 of this WI should be followed in practice.
• Steel tape binding as mentioned in para 3.15 of this WI should be  done.

• There are two types of rotors being manufactured:- MIG welded and Induction brazed. There is no WI issued for the latter.
• Knowledge of this WI is OK among the staff.

CEE during his inspection of TM shop today asked about BRC shed buffer height case. He was informed about the NC raised by inspection wing.

Traction Motor Plant

Audit of following Work Instructions was done in TM Shop. Report is as follows:-

Assembly of short circuit cage( W 21.404):-

Points noticed:-

• Record of the stack length measurement should be be taken as prescribed in para 3.9 and para 3.11 and para 3.15 of this WI.

• Pressing machine gauge for measuring 45T pressure is due for calibration.

• Auxilary pressing ring as mentioned in para 3.14 of this WI should be available in the shop. 

• Tightening of nuts as mentioned in para 3.15 of this WI should be be done with torque wrenches.

• Source of half rings could not be traced .

TEW make traction link bolt’s lab test report has come today. Sample has failed the chemical test and passed the hardness test.

Traction Motors Manyfacturing

Audit of following Work Instructions was donein TM Shop. Report is as follows:-

Assembly of short circuit cage( W 21.404):-

Points noticed:-

• Initial insertion of 4 copper bars as mentioned in Para 3.5 of this WI should be followed in induction brazed rotors as evident from above snap.

• Press punching as mentioned in para 3.10 of this WI should be followed in practice.
• Due to non availability of copper bars and MIG welding plant defective 3 phase TN rotor assembly work is held up since more than 10 days.
• Steel tape binding as mentioned in para 3.15 of this WI should be done

• There are two types of rotors being manufactured:- MIG welded and Induction brazed. There is no WI issued for the latter.

• Knowledge of this WI is ok among the staff.

BRC shed has further reported failure of Harmonic filter contactor air pipe. Same forwarded to Production and design.

How Traction Motors are manufactured?

Audit of following Work Instructions was done in TM Shop. Report is as follows:-

Assembly of short circuit cage( W 21.404):-

Points noticed:-

• Record of the stack length measurement should be taken as prescribed in para 3.9 and para 3.11 and para 3.15 of this WI.

• Pressing machine gauge for measuring 45T pressure due for calibration.

• Auxilary pressing ring as mentioned in para 3.14 of this WI being made available in the shop.

• Tightening of nuts as mentioned in para 3.15 of this WI should be done with torque wrenches.

• Source of half rings could not be traced .

TEW make traction link bolt’s lab test report has come today. Sample has failed the chemical test and passed the hardness test. In CLW quality is paramount.