Page 105 - Industrial Power Engineering and Applications Handbook
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Made of
1. tough iron casting free from brittleness or
2. stainless steel or
3. aluminium chromium corrosion and vibration resistant
Possesses high specific resistance = 120 FR-cm and low
temperature coefficient of 0.00022 R/R/"C. Causes negligible
change from start to run and therefore provides a fairly accurate
speed control
Figure 5.3(a) Cast iron grid resistance (Courtesy: BCH)
Figure 5.3(b) Stainless steel punched grid resistance (Courtesy: BCH)
Figure 5.3(c) AI-Cr alloy steel punched grid resistor in multitier arrangement (Courtesy: BCH)
