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Thermal protection for locomotive main traction alternators

  • US 5,298,842 A
  • Filed: 04/03/1992
  • Issued: 03/29/1994
  • Est. Priority Date: 04/03/1992
  • Status: Expired due to Fees
First Claim
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1. A thermal overload protection control method for a locomotive having an alternator, the method comprising the steps of:

  • (a) providing a sensor temperature;

    (b) sensing ambient inlet air temperature to the alternator;

    (c) calculating a traction motor current limit to generate a calculated traction motor current limit value, including the steps of,i. dividing a difference between the stator winding sensor temperature and the alternator ambient air temperature by a calibration factor to generate a first value,ii. summing the first value and the alternator ambient air temperature to generate a second value,iii. multiplying the second value and a constant related to a time rate of load reduction to generate a third value, andiv. substracting the third value from a constant related to a maximum permissible winding temperature to generate a fourth value which is indicative of the calculated traction motor current limit value; and

    (d) controlling thermal overload in response to the calculated traction motor current limit value.

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