Electricity: motive power systems – Reciprocating or oscillating motor – Energizing winding circuit control
Patent
1980-05-15
1982-07-27
Truhe, J. V.
Electricity: motive power systems
Reciprocating or oscillating motor
Energizing winding circuit control
318254, 318439, H02K 2900
Patent
active
043419844
ABSTRACT:
A Direct Current electric motor comprises a stator consisting of a plurality of coils interconnected to one another, and a plurality of gate controlled solid state rectifiers responsive to forced commutation below a particular rpm and self-commutation above said rpm which are connected to the junctions of the coils for selectively conducting current into and out of the stator coil junctions in dependence upon which of said rectifiers is rendered operative. This produces a plurality of stator poles which are angularly displaced from the poles of the rotor of the motor and which shift in position as the rotor rotates. A plurality of trigger assemblies are provided for controlling the energization of the various gate electrodes, each of said trigger assemblies comprising a pick-up coil which forms a portion of a frequency selective circuit whose resonance frequency varies in dependence on the position of a magnetic element that is moved relative to the pick-up coils as the rotor rotates. A sine wave oscillator is coupled to the frequency selective circuits in the trigger assemblies, the oscillator being operative to produce either of two different output frequencies, and an electronic switch responsive to the speed of rotation of the rotor selectively changes the output frequency of the oscillator. One of these frequencies induces trigger assembly operation at all rotor positions and advanced SCR trigger timing for reliable starting and very low speed operation. The other frequency retards SCR trigger timing for most efficient motor running at moderate and high speeds.
REFERENCES:
patent: 3419782 (1968-12-01), Sheldrake et al.
patent: 3453512 (1969-08-01), Polakowski
patent: 3483458 (1969-12-01), Kirk
patent: 3594624 (1971-07-01), Lueder
patent: 4095148 (1978-06-01), Parker
Hedges Rhey W.
Parker Louis W.
Bergmann S.
Parker Louis W.
Truhe J. V.
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