Question
Download Solution PDFIt is intended to measure the resistance of the series field winding of a DC series motor accurately. Which is the most suitable method?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe most suitable method to measure the resistance of the series field winding of a DC series motor is the Kelvin double bridge method.
Kelvin Double Bridge
- The series field winding of a DC motor has low resistance, typically in the milliohm range.
- The Kelvin double bridge is specifically designed to measure low resistances accurately.
Measurement of resistance, inductance, and capacitance
|
Measurement of resistance |
High resistance |
Megger circuit, Loss of charge method |
|
Medium resistance |
Substitution method, Ohmmeter, Wheatstone bridge |
|
|
Low resistance |
Kelvin double bridge, Potentiometer, Ammeter-Voltmeter method |
|
|
Measurement of inductance |
High Q value |
Hay’s bridge |
|
Medium Q value |
Maxwell Inductance Capacitance bridge |
|
|
Low Q value |
Owen’s bridge, Anderson bridge |
|
|
Measurement of capacitance |
Lossy Capacitor |
Schering bridge |
|
Lossless Capacitor |
De-Sauty’s bridge |
|
|
Measurement of frequency |
|
Wien Bridge |
Last updated on May 29, 2025
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