It can also be used to provide better cooling of a solenoid.įerrofluid can be used to form an elastic core in “soft” stretchable solenoids that can be used in modern stretchy and flexible (bendable) electronics such as wearable computers and biomedical monitoring devices. The ferrofluid also reduces the magnetic flux leakage in magnetic circuits. The ferrofluid decreases or even completely eliminates the noise and increases the magnetic force, which increases the compactness of solenoid actuators. Solenoid actuators are quite noisy, therefore sometimes solenoids include ferrofluid in gaps between the moving plunger and the coil spool. Where μ₀=4π × 10⁻⁷ H/m is the magnetic constant, N is the number of turns, I is the current, and L is the solenoid length. The magnetic field (another name is magnetic flux density) B of a long solenoid in air without a ferromagnetic core is calculated using the following formula Most often solenoids with ferromagnetic cores are used to convert electrical energy into linear motion, for example, in an automotive starter solenoid, which is used as a starter relay to provide current to the starter motor and to move the starter pinion of the starter motor into engagement with the flywheel of the engine. When an electric current passes through a solenoid, it produces a uniform magnetic field. A solenoid is a tightly wound coil with a length that is substantially greater than its diameter.
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