Electronically controlled magnetic stirrer

Claim 2

A magnetic stirrer for stirring low viscosity media, comprising a housing on which a receptacle containing the medium to be stirred can be mounted, a plurality of electromagnets in said housing for effecting stirring, at least one freely movable stirring arm in said receptacle controlled by the electromagnets, said stirring arm being free from axial restraint, and an electronic control element for energizing said electromagnets independently in succession, said electromagnets being independently operatively associated with said control element and arranged inside the housing to produce a rotary magnetic field within the receptacle upon corresponding consecutive energizing of the individual electromagnets by said electronic control element, whereby the speed of rotation of the magnetic field intensity are infinitely variable within a broad range and the direction of rotation of the magnetic field can be reversed at will by the electronic control element.

Claim 3

A magnetic stirrer according to claim 1 wherein said stirring arm comprises magnetizable soft-iron parts which are provided with blades to promote the stirring action.

Claim 4

A magnetic stirrer according to claim 1 comprising heating means in said housing in the region of the receptacle by which the medium may be heated during the stirring.

Claim 5

A magnetic stirrer for stirring low viscosity media, comprising a housing n which a receptacle containing the medium to be stirred can be mounted, a plurality of electromagnets in said housing for effecting stirring, and an electronic control element for energizing said electromagnets independently in succession, said electromagnets being independently operatively associated with said control element and arranged inside the housing to produce a rotary magnetic field within the receptacle upon corresponding consecutive energizing of the individual electromagnets by said electronic control element, whereby the speed of rotation of the magnetic field determining the stirring speed and the magnetic field intensity are infinitely variable within a broad range and the direction of rotation of the magnetic field can be reversed at will by the electronic control element, and further including means on said housing for resiliently supporting said receptacle in spaced relation from the housing, the latter means including a magnetic plate on which said receptacle is adapted to be supported to provide a three dimensional vibrating movement for said receptacle under the action of the rotating magnetic field.

Claim 6

A magnetic stirrer for stirring low viscosity media, comprising a housing n which a receptacle containing the medium to be stirred can be mounted, a plurality of electromagnets in said housing for effecting stirring, and an electronic control element for energizing said electromagnets independently in succession, said electromagnets being independently operatively associated with said control element and arranged inside the housing to produce a rotary magnetic field within the receptacle upon corresponding consecutive energizing of the individual electromagnets by said electronic control element, whereby the speed of rotation of the magnetic field determining the stirring speed and the magnetic field intensity are infinitely variable within a broad range and the direction of rotation of the magnetic field can be reversed at will by the electronic control element, and further including means on said housing for resiliently supporting said receptacle in spaced relation from the housing, the latter means including a magnetic plate on which said receptacle is adapted to be supported to provide a three dimensional vibrating movement for said receptacle under the action of the rotating magnetic field.

Claim 7

A magnetic stirrer according to claim 4 wherein said means for resiliently supporting the housing further comprises an indented ring extending upwardly from said housing, a frame for said receptacle, springs secured to said frame and to said indented ring, and resilient bands connected to said frame for engaging the receptacle to hold the same against said frame, said magnetic plate being mounted on the frame on the underside to face said electromagnetic.