Permanent magnet and energy storage

What is a permanent magnet?

A permanent magnet is one that maintains a large magnetic flux in the absence of a magnetizing field. These magnets are crucial for the operation of various devices such as generators, alternators, eddy current brakes, motors, and relays.

What is a magnetic circuit-based approach to deriving stored energy?

A magnetic circuit-based approach to deriving stored energy provides an intuitive understanding of stored energy in permanent magnets. The resulting energy expression is also consistent with all granularities of analysis, from magnetic circuits to 3D finite elements calculations.

Why are permanent magnets needed?

Permanent magnets are crucial due to the escalating demand for cheaper, smaller, and more powerful motors and generators. This demand is driven by various applications such as wind turbines, hybrid or electric vehicles, and consumer and military devices.

What makes a permanent magnet remanent?

In an ideal permanent magnet, a large remanent magnetic flux (B r) must be maintained in the absence of a magnetic field. This is achieved by having a large resistance to demagnetization (H c or intrinsic coercivity H ci).

Are MnAl compounds good for permanent magnets?

MnAl compounds, particularly near-equiatomic L10-type and structurally stabilized MnAlC compounds with interstitial carbon, hold promise as an advanced permanent magnet due to their high coercivity values, moderately high energy product, large corrosion resistivity, and low cost.

What devices use permanent magnets?

Advanced permanent magnets—which maintain a large magnetic flux in the absence of a magnetizing field—underlie the operation of generators, alternators, eddy current brakes, motors, and relays.