A control system for a permanent magnet motor having low-resolution speed measurement is taught. A plurality of particles, each of which is coated with a capture agent having an affinity for a cardiac marker, is combined with the sample to form a plurality of analyte-particle complexes. A pair of outer magnetic poles are positioned opposite each other about the voice coil. Such a food product includes a balance of long chain and short chain omega-3 highly unsaturated fatty acids.