Optimized electric machine for smart actuators
A single stator electric machine includes a plurality of magnets for generating a first magnetic field. Each respective magnet represents a respective rotor pole. A magnet holder retains the plurality of magnets. A stator is disposed radially outward from the plurality of magnets for generating a second magnetic field. The stator includes a plurality of stator poles separated by slots with each of the stator poles having a concentrated winding with a respective number of turns formed around each respective stator pole. Each respective concentrated winding within the stator comprises non-overlapping phases which increase an active length of the windings of the stator and reduce an overhang of each respective winding with respect to each stator pole for improving torque efficiency. A number of rotor poles is at least eight and the number of rotor poles and a number of stator slots have a least common multiple of at least 36.
1. A single stator electric machine comprising:
a plurality of magnets for generating a first magnetic field, each respective magnet represents a respective rotor pole;
a magnet holder for retaining the plurality of magnets, the magnet holder having a circular configuration with the plurality of magnets being positioned around the circular configuration of the magnet holder; and
a stator disposed radially outward from the plurality of magnets for generating a second magnetic field, the magnet and the stator having a first air gap formed therebetween, the stator including a plurality of stator poles separated by slots with each of the stator poles having a concentrated winding with a respective number of turns formed around each respective stator pole, each respective concentrated winding within the stator comprising non-overlapping phases, the concentrated windings increase an active length of the windings of the stator and reduce an overhang of each respective winding with respect to each stator pole for improving torque density and machine efficiency, the concentrated windings including a winding factor of greater than 0.7;
wherein the number of rotor poles is at least eight, and wherein the number of rotor poles and a number of stator slots have a least common multiple of at least 36.