초록 ▼

This PMDC machine concept operates from a constant dc voltage source with maximum torque capacity throughout its rotational speed range. The back electromotive force (back-emf) produced by the machine windings under the constant amplitude air gap field produced by the magnets is controlled by changi

This PMDC machine concept operates from a constant dc voltage source with maximum torque capacity throughout its rotational speed range. The back electromotive force (back-emf) produced by the machine windings under the constant amplitude air gap field produced by the magnets is controlled by changing the winding configurations in series-parallel combinations. Torque is, thus, controlled from minimum to maximum speed without exceeding winding current capacities and without need to increase driving voltage with speed. At startup and low speed the combined back-emf of series connected windings limit current while producing maximum torque. At higher speeds where back-emf would severely limit torque, the windings are connected in series-parallel combinations for maximum achievable torque without exceeding winding current capacities. To accomplish this, windings concentrated in slots are used. Result is optimum utilization of core magnetics and capability of operating at constant input voltage.

대표청구항 ▼

[ I claim to have invented:] [1.] A permanent magnet direct current motor comprising:said motor having a stator element,said motor having a rotor element,said elements defining an air gap between them,poles, on said rotor, said poles comprising permanent magnets for providing magnetic flux across sa

[ I claim to have invented:] [1.] A permanent magnet direct current motor comprising:said motor having a stator element,said motor having a rotor element,said elements defining an air gap between them,poles, on said rotor, said poles comprising permanent magnets for providing magnetic flux across said air gap,said stator element having more slot paths, than there are poles on the rotor, each slot path having coils, andelectrical conductors which when connected to a source of electricity will feed such electricity to said coils,said rotor element being rotatable about an axis, andthe gross angular width of each slot path, as measured in a plane perpendicular to said axis, being small as compared to the gross angular width of said poles as measured in said plane.