Magnetic Couplings

Eliminate Seal Leakage by Switching to Magnetic Couplings

The standard Rexroth pump drive shaft seal can be replaced with a permanent magnet coupling eliminating seal leakage and downtime associated with seal replacement. The inner submerged magnet is of “sealed” construction.

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Magnetic Couplings - How They Work

A magnetic coupling consists of two magnet assemblies. One is the outer assembly (the driver magnet) and the other is the inner assembly (the driven magnet). The outer assembly is connected to a motor and the inner assembly is directly attached to the pump input drive shaft. Since the inner magnet is isolated within the pump case, seals and therefore leaks are eliminated.

When load (torque) is applied, the coupling deflects angularly and the magnets create a force of simultaneous attraction and repulsion. This force is used to transfer torque from the motor to the drive shaft this permanent magnet coupling creates neither slippage nor induction current during rotation.