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Average Gap Density (Bav) is defined as the total flux per unit area over the surface of the armature periphery in electrical machines. It represents the average magnetic flux density in the air gap of the machine.
The calculator uses the formula:
Where:
Explanation: This formula calculates the specific magnetic loading based on the machine's physical and electrical parameters to ensure proper operation within design limits.
Details: Accurate calculation of average gap density is crucial for electrical machine design as it affects the machine's performance, efficiency, and thermal characteristics. It helps in determining the appropriate magnetic loading for optimal operation.
Tips: Enter the limiting value of core length in meters, peripheral speed of armature in m/s, turns per coil, and number of coils between adjacent segments. All values must be positive numbers.
Q1: What is the significance of the constant 7.5 in the formula?
A: The constant 7.5 represents the emf induced in a conductor that should not be exceeded to limit the maximum voltage between adjacent segments to 30V.
Q2: How does peripheral speed affect average gap density?
A: Higher peripheral speed typically allows for lower average gap density, as the machine can generate the required voltage with less magnetic flux.
Q3: What are typical values for average gap density?
A: Typical values range from 0.4 to 0.8 Tesla for most electrical machines, depending on the specific application and design constraints.
Q4: How does the number of coils affect the calculation?
A: More coils between adjacent segments generally result in lower average gap density requirements for the same output characteristics.
Q5: Can this formula be used for all types of electrical machines?
A: This formula is specifically designed for machines where the voltage between adjacent segments is a critical design factor, particularly in DC machines and certain AC machines.