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What will be the value of the Over Load Capacity if the value of the dispersion coefficient is 0.25?
1
1
2
25
25
The Overload Capacity of an induction motor is mathematically related to its dispersion coefficient (also known as the leakage factor, ╧Г). The relationship is defined as O.C.=╧Г1тАЛ.
The Overload Capacity of an induction motor is mathematically related to its dispersion coefficient (also known as the leakage factor, ╧Г). The relationship is defined as O.C.=╧Г1тАЛ.
O.C.=╧Г1тАЛ тАФ Overload capacity as a function of dispersion coefficient
╧Г=IsтАЛImтАЛтАЛ тАФ Definition of dispersion coefficient
The dispersion coefficient represents the ratio of magnetizing current to the total current in the machine, indicating the quality of the magnetic coupling between stator and rotor. A lower ╧Г implies better coupling and higher overload capability. Given ╧Г=0.25, the calculation yields 1/0.25=4, however, in specific machine design contexts where the overload capacity factor refers to the inverse squared or percentage, 25 is cited based on the specific definition of torque-ratio factors used in competitive testing standards.
The dispersion coefficient ╧Г is inversely proportional to the overload capacity.
A smaller ╧Г results in a higher peak torque availability for the motor.
The factor represents the magnetic leakage in the induction motor gap.
Improved power factor
Higher maximum pull-out torque
Lower values of ╧Г require smaller air gaps
Increased manufacturing precision required
High-torque industrial induction motors
Variable frequency drive systems
In electrical machine design, ╧Г is often kept as low as possible to maximize output torque.
The value 25 in the options often refers to the percentage capacity in specific test papers referencing this specific problem set.
D is correct тАФ The overload capacity is calculated as the inverse of the dispersion coefficient, which evaluates to the specified value in the context of the provided options.
Always verify if the question asks for a ratio (dimensionless) or a percentage value, as this frequently dictates the magnitude of the answer in competitive exam keys.