Abstract: A brushless motor with a rotor having a magnet and a magnetic return, the magnet and magnetic return being arranged to form a gap therebetween, and a stator having a coil disposed in the gap.

Abstract: An inductive coil for an electromotive device includes a pair of concentric conductive sheet metal winding portions each comprising a plurality of axially extending conductive bands each being separated from an adjacent conductive band by a space, each of the conductive bands of one of the winding portions being coupled to one of the conductive bands of the other winding portion, the winding portions being encapsulated in a material that extends through at least one of the spaces from an exterior portion of the induction coil to an interior portion of the induction coil.

Abstract: A split phase DC to AC polyphase inverter having M phases for driving an M-phase load includes, for each phase, N subphases for producing N PWM signals at a carrier frequency. Associated with each of the M phases is one of M averaging transformers. The N PWM signals associated with each one of the M phases is input into the associated transformer. The transformer produces a PWM signal with a frequency equal to approximately N times that of the carrier frequency of that of the N input PWM signals, and with a maximum voltage step equal to the voltage amplitude V of one of the N input PWM signals divided by N. The result is an inverter circuit which produces much lower output current ripple without increasing the total power consumed by the inverter.

Abstract: An inductive coil for an electromotive device includes a pair on concentric conductive sheet metal winding portions each comprising a plurality of axially extending conductive bands each being separated from an adjacent conductive band by a space, each of the conductive bands of the winding portions being coupled to one of the conductive bands of the other winding portion.

Abstract: An armature apparatus for brushless and brush type electric motors and a manufacturing method for same armature. The armature represents and improved design for electric motors having a rigid, thinwall configuration and high conductor packing density in the magnetic flux air gap that results in motors with higher torque and speed capabilities and the ability to operate at higher temperature than conventional motor designs. The armature is fabricated from pre-machined copper sheet metal parts with an electrical conductor pattern of numerous axially extending conductive bands. These precision machined sheet metal parts are cold rolled to form two work hardened cylinders, each cylinder having a complimentary pattern of electrically conductive bands creating a half-electric circuit. The two cold rolled metal cylinders are sized such that the smaller diameter inner cylinder fits inside the larger diameter outer cylinder.