Abstract: An electromechanical transducer apparatus is disclosed and includes a housing. A static portion is substantially immobilized within the housing and includes a magnetic flux generator for generating magnetic flux, a pair of pole pieces for coupling magnetic flux through at least one of a first magnetic circuit and a second magnetic circuit, and a coil disposed to electromagnetically interact with one of the magnetic circuits. The static portion is thermally coupled to the housing via a low thermal resistance path to permit removal of heat. A movable portion includes first and second closing pieces separated from the pole pieces by first and second gaps. The closing pieces are mechanically coupled and supported for reciprocating motion about an equilibrium position which varies the gaps to cause a variation in magnetic reluctance in each of the first and second magnetic circuits.

Abstract: An electromechanical transducer apparatus is disclosed and includes a housing. A static portion is substantially immobilized within the housing and includes a magnetic flux generator for generating magnetic flux, a pair of pole pieces for coupling magnetic flux through at least one of a first magnetic circuit and a second magnetic circuit, and a coil disposed to electromagnetically interact with one of the magnetic circuits. The static portion is thermally coupled to the housing via a low thermal resistance path to permit removal of heat. A movable portion includes first and second closing pieces separated from the pole pieces by first and second gaps. The closing pieces are mechanically coupled and supported for reciprocating motion about an equilibrium position which varies the gaps to cause a variation in magnetic reluctance in each of the first and second magnetic circuits.

Abstract: A reduced weight rotor design for use in an electric motor where the reduced weight rotor maintains its structural integrity. The reduced weight rotor includes a center hub, an outer ring having lobed portions extending inwardly towards the hub and located adjacent to each location of a magnetic pole pairing, and spokes connecting the hub to the outer ring where the spokes are arranged in a number of pairs equal to the total number of the magnetic pole pairings and wherein each spoke of a given pair does not cross each other spoke of the given pair but does cross a spoke of an adjacent pair thereby forming a one cross spoke pattern.

Abstract: A reduced weight rotor design for use in an electric motor where the reduced weight rotor maintains its structural integrity. The reduced weight rotor includes a center hub, an outer ring having lobed portions extending inwardly towards the hub and located adjacent to each location of a magnetic pole pairing, and spokes connecting the hub to the outer ring where the spokes are arranged in a number of pairs equal to the total number of the magnetic pole pairings and wherein each spoke of a given pair does not cross each other spoke of the given pair but does cross a spoke of an adjacent pair thereby forming a one cross spoke pattern.

Abstract: Improved battery charge state determination. The estimated charge state of a battery comprising a plurality of series connected cells is updated using Coulomb counting during battery operation, for example, while operating an electric vehicle motor. The estimated charge state may be coupled to a fuel gauge. When the battery is in a no load state, a no load voltage measurement is made. During testing, a set of relationships between battery no load voltages and associated known good charge states have been determined. The measured no load voltage is compared to the set of no load voltages associated with known good charge states. A known good charge state associated with the measured no load voltage is used to update the estimated charge state, thereby providing a more accurate indication of the actual battery charge state, thus providing a more robust and accurate fuel gauge.

Abstract: An electric motor configured to maximize active motive material within a given motor size by having one or more phase lead exit holes configured to prevent unwanted outside contaminants from entering the motor, phase leads each having an integral strain relief, and two or more Wye terminations that are not electrically connected to each other.