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Magnetic stirrer

  • US 4,080,663 A
  • Filed: 03/07/1977
  • Issued: 03/21/1978
  • Est. Priority Date: 03/09/1976
  • Status: Expired due to Term
First Claim
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1. A magnetic stirrer comprising a stirring rotor in form of a permanent bar magnet which is easily movable in a vessel containing a fluid to be stirred, at least one pair of parallelly disposed magnet coils, supplied with respective phase-shifted a.c. currents to induce opposite magnetomotive forces in said coils, resulting in a rotating magnet field, said vessel being positioned near the top plane of said coils and having the rotor substantially aligned with the common centre axis of the coils, so that the rotor is rotated by said rotating magnet field, a plate of a soft-magnetic material having magnetic shielding properties, such as mu-metal, being positioned adjacent the bottom of said vessel and substantially in said common centre axis of the coils.

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