Transporting apparatus

A transporting apparatus using a linear motor comprising:

• (a) a pair of primary units each generating a progressive magnetic field;
• and
• (b) a secondary unit inserted between said primary units with certain gaps such that a predetermined plane of said secondary unit faces a plane of said progressive magnetic field generated by each primary unit with said certain gap,
• said secondary unit comprising a plurality of permanent magnets and cores which are arranged in turn along a progressing direction of said progressive magnetic field so that a said core is dispensed between adjacent permanent magnets, and
• said permanent magnets being magnetized such that poles of adjacent permanent magnets are in facing relation to one another,
• said poles in facing relation having the same polarity so that a core disposed therebetween is magnetized as said polarity, whereby planes of said cores facing plane of said progressive magnetic field are magnetized in a north pole and a south pole in turn.

A transporting apparatus comprising:

• (a) a secondary unit of a linear motor, said secondary unit comprising a plurality of permanent magnets and cores which are arranged in turn along a longitudinal direction thereof so that a said core is disposed between adjacent permanent magnets, said permanent magnets being magnetized such that poles of adjacent permanent magnets are in facing relation, said poles in facing relation having the same plurality so that a core disposed therebetween is magnetized as said polarity, whereby said cores are magnetized in a north pole and a south pole in turn, said linear motor having three-dimensional transporting lines including vertical lines;
• (b) first and second primary units of said linear motor, each of first and second primary units comprising a core and coils winding around said core, said secondary unit being inserted between said first and second primary units so that said core of said first primary unit is arranged opposite to that of said second primary unit with said secondary unit, said first and second primary units being linked together so as to construct a transporting truck of said linear motor;
• (c) gap detecting means for detecting first and second gaps each formed between said secondary unit and each of said first and secondary primary units;
• and
• (d) control means for controlling currents supplied to said coils of said first and second primary units so that said first gap is maintained identical to said second gap.