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What Is Length-to-diameter Ratio (L/D)?

We usually say the magnetic length/effective pole diameter (L/D) is not suitable when we explain to customers that the design of the size of a product is unreasonable. Now, let me explain what L/D is. L/D is the ratio of the length of magnetization direction of a magnet (L) to the diameter of the magnetization surface (D). For NdFeB magnets, L/D is of important reference significance for the preliminary judgment of the temperature resistance of the magnet. Under normal circumstances, we recommend an L/D of over 0.5 (preferably≥0.7). L/D is calculated as follows: (1)For instance, for a cylinder of D10*6 with a magnetization direction of 6, its L/D: 6/10=0.6. The L/D is very good. It has a very good high-temperature resistance. (2)For instance, for a square of 15*15*3 with a magnetization direction of 3, its L/D: 3 / (2 * = 3 /16.92=0.17). The L/D is relatively small. It has a poor high-temperature resistance, which needs to be further improved. Please consult our professional engineers for the selection of L/D of specific products.

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About the author

Cathy Marchio

Cathy Marchio is an expert at Stanford Magnets, where she shares her deep knowledge of magnets like Neodymium and Samarium Cobalt. With a background in materials science, Cathy writes articles and guides that make complex topics easier to understand. She helps people learn about magnets and their uses in different industries, making her a key part of the company's success.

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