Electronic commutation for direct current electric motors

Details Electronic commutation for direct current electric motors Electronic commutation for direct current electric motors

H - Electricity

02

P

318/68, 318/93

H02P 6/02 (1980.01)

Patent

CA 1175475

ELECTRONIC COMMUTATION FOR DIRECT CURRENT ELECTRIC MOTORS Abstract Of The Disclosure A Direct Current electric motor comprises a stator con- sisting 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.

397919

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