High efficiency electronically commutated motor

An electronically commutated motor for converting between electrical and rotary mechanical energy comprising:

• a rotor, a stator and an electronic drive, wherein said rotor is journalled to rotate about an axis of rotation, said stator is stationary relative to said rotor, and said electronic drive provides synchronous power to said stator and drives said rotor;
• said rotor is constructed having a circumferential array of alternating polarity permanent magnet poles that drive magnetic flux circumferentially through said rotor and across an armature air gap created adjacent said rotor;
• said stator comprises a slotless armature in said armature airgap, having three phase windings that magnetically exert torque upon said rotor when said windings are electrically energized by said electronic drive;
• said phase windings are wound from wire that is formed from bundled together multiple individually insulated conductor strands, wherein said strands are electrically connected in parallel and are electrically insulated between each other along active lengths where they lie in said magnetic flux in said armature airgap;
• said electronic drive converts electrical supply power into regulated power synchronous with said back emf of said phase windings through a combination of resonant switching for providing current regulation to said phase windings, in conjunction with commutation advancement triggering to said phase windings controlled from event monitoring of back-emf zero crossing in said phase windings.

An electronically commutated motor for converting between electrical and rotary mechanical energy comprising:

• a rotor, a stator and an electronic drive, wherein said rotor is journalled to rotate about an axis of rotation, said stator is stationary relative to said rotor, and said electronic drive provides synchronous power to said stator and drives said rotor;
• said rotor is constructed having a circumferential array of alternating polarity permanent magnet poles that drive magnetic flux circumferentially through said rotor and across an armature air gap created adjacent said rotor;
• said stator comprises an airgap armature in said armature airgap, having three phase windings that magnetically exert torque upon said rotor when said windings are electrically energized by said electronic drive;
• said phase windings are wound from wire that is formed from bundled together multiple individually insulated conductor strands, wherein said strands are electrically connected in parallel and are electrically insulated between each other along lengths where they lie in said magnetic flux in said armature airgap;
• wherein said electronic drive converts electrical supply power into power that is synchronous with back emf of said phase windings by regulating power through a switch mode converter to a variable bus supplying a semiconductor output inverter bridge connected to said phase windings, and said electronic drive varies the speed of said rotor though use of active acceleration with passive deceleration.