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Characteristics of HS‐15250 traction motors: a case study in quality control

Mahesh Chandra (RDSO Bhopal, Berkheda BHEL, Bhopal, India)

International Journal of Quality & Reliability Management

ISSN: 0265-671X

Article publication date: 28 June 2011




The paper aims to discuss a case study involving the speed load characteristics of DC series motors used for traction application. The variation of characteristics from motor to motor in a mass manufacturing situation is required to be maintained within a narrow band.


The approach adopted was to analyze the data, compare these with competitors' corresponding data and study the base documents to identify the root cause. Having done that an attempt to achieve specific improvements and measure improvements was carried out.


The paper finds the limits being followed had to be corrected. Strict control on a few selected parameters was established. An improvement on the method of setting neutral axis was tried with advantage. It was found that motors manufactured by a manufacturer were not able to meet the requirements. An investigation was undertaken to determine the root cause and corrective measures.

Research limitations/implications

In the absence of computerised models, the experimentation had to be done in shop on a limited scale.

Practical implications

The method can be applied to solve the same problem on any other design of traction motor. Also the approach remains useful for handling other problems in traction motors.


The inference regarding the relationships of speed with pole diameter, the importance of accuracy of magnetic neutral and method of refining neutral settings are the original findings.



Chandra, M. (2011), "Characteristics of HS‐15250 traction motors: a case study in quality control", International Journal of Quality & Reliability Management, Vol. 28 No. 6, pp. 662-674.



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Copyright © 2011, Emerald Group Publishing Limited

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