The stray load loss of a wound rotor induction motor can be determined by A. applying a predetermined current to the stator and subtracting the I²R loss from the input power. B. exciting the rotor with a-c voltage and driving it at synchronous speed in the opposite direction. C. driving the rotor in the normal direction by an external power source. D. measuring the total losses and adding the other losses. Note: I have doubts if it is the letter A or the letter C, can you help me in this question, thanks.
. The stray load loss of a wound rotor induction motor can be determined by
A. applying a predetermined current to the stator and subtracting the I²R loss from the input power.
B. exciting the rotor with a-c voltage and driving it at synchronous speed in the opposite direction.
C. driving the rotor in the normal direction by an external power source.
D. measuring the total losses and adding the other losses.
Note: I have doubts if it is the letter A or the letter C, can you help me in this question, thanks.
The losses in the wound rotor induction motor are categorized into two types, these are
- Constant loss
- Variable loss
The power flow diagram of the induction motor is shown below:
When the predetermined current is applied to the stator the constant losses can be easily determined. From the power flow diagram, the variable losses are accompanied by copper loss( I²R loss) and stray-load loss. Thus if the constant loss and the I²R loss are known, the stray-load loss can be determined. So, applying a predetermined current to the stator and subtracting the I²R loss from the input power.
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