Magnetic Drive Pumps

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Magnetic Drive pumps vary from the traditional pumping style as the motor is coupled to the pump by magnetic means rather than by a direct mechanical shaft. The pump works via a drive magnet, ‘driving’ the pump rotor, which is magnetically-coupled to the primary shaft driven by the motor.[1]

Advantages of Magnetic Drive Pumps

  • There are no drive seals - Therefore the risk of leaks are completely eradicated. This means that hazardous liquids can be pumped without spillages.
  • No Heat Transfer From the Motor- The pump chamber is separated from the motor by an air gap, this provides a thermal barrier.
  • Complete separation of the liquid- means that liquid cannot seep into the motor from the pump.
  • Reduced friction.
  • Magnetic coupling can be broken- If the load of the pump is too great. By the magnetic coupling ‘breaking’ it means the pump does not overload and get damaged. [2]

Eliminating the drive seals gets rid of leaks, friction loss, wear and noise. What it gives you is complete separation of fluid from the pump drive, and 100% transfer of Motor power into pumping power.

Disadvantages of magnetic Drive Pumps

  • Liquids containing ferrous particles are problematic when a magnetic drive pump is used. This is due to the particles collecting on the impeller magnet, and over time causing the pump to stop working.

References

  1. ↑ ”Pump Handbook:third edition”,
  2. ↑ Pumping Profits & Productivity, The Magic Of Magnetic Drive Pumps: Part I


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