Abstract: Disclosed in the present invention is a tandem starter-generator construction that includes an induction motor-generator, a permanent magnet motor-generator and power transmission unit disposed adjacent to the motor-generators. The induction motor-generator is utilized predominantly as a motor to provide mechanical power at relatively high efficiency as a motor, and as a generator to provide electrical power during regenerative braking. The permanent magnet motor-generator is used predominantly as a generator for very high efficiency power conversion and to capture additional electrical power during regenerative braking to compensate for the regenerative energy captured at lower efficiency by the induction motor-generator.

Abstract: Disclosed in the present invention is a shaft construction for motor-generators and alternators that provides effective airflow and improved overall cooling without the need for an external fan. The shaft comprises a plurality of circumferentially disposed centrifugal fan blades and longitudinal cooling channels. As the shaft rotates, the centrifugal fan blades pull the air inwardly across the winding end-turns on one end of the stator into the housing and propels the air at high pressure through the cooling channels along the shaft to cool the rotor inner circumferential surfaces, winding end-turns on the other end of the stator and bearings mounting surfaces, and exhausts through the exhaust vents on the ends of the housing. The airflow path provides effective cooling of the stator windings, rotor, shaft and bearings that prevents high temperature gradients, thus resulting in improved motor-generator performance.

Abstract: Disclosed in the present invention is a dual-structured power output apparatus of an electric drive and power system that provides a means for outputting both mechanical power and electrical power. It comprises dual motor/generators having two stator assemblies, two rotor assemblies and a power transmission unit all integrated into a single housing for easy mounting. The power transmission unit is disposed adjacent to the two motor/generators and coupled on both ends to rotating shafts mechanically linked to the rotor assemblies such that they are rotatable relative to each other. It function is to change the rotational speed and torque of at least one of the rotors in order to reduce weight and physical size of the apparatus, and thus significantly improving the power density and capability. The structure of the apparatus is well-suited to improve the performance and fuel efficiency of the prior art hybrid powertrain.

Abstract: Disclosed in the present invention is a shaft construction for motor-generators and alternators that provides effective airflow and improved overall cooling without the need for an external fan. The shaft comprises a plurality of circumferentially disposed centrifugal fan blades and longitudinal cooling channels. As the shaft rotates, the centrifugal fan blades pull the air inwardly across the winding end-turns on one end of the stator into the housing and propels the air at high pressure through the cooling channels along the shaft to cool the rotor inner circumferential surfaces, winding end-turns on the other end of the stator and bearings mounting surfaces, and exhausts through the exhaust vents on the ends of the housing. The airflow path provides effective cooling of the stator windings, rotor, shaft and bearings that prevents high temperature gradients, thus resulting in improved motor-generator performance.

Abstract: Disclosed in the present invention is a tandem starter-generator construction that includes an induction motor-generator, a permanent magnet motor-generator and power transmission unit disposed adjacent to the motor-generators. The induction motor-generator is utilized predominantly as a motor to provide mechanical power at relatively high efficiency as a motor, and as a generator to provide electrical power during regenerative braking. The permanent magnet motor-generator is used predominantly as a generator for very high efficiency power conversion and to capture additional electrical power during regenerative braking to compensate for the regenerative energy captured at lower efficiency by the induction motor-generator.

Abstract: Disclosed in the present invention is a dual-structured power output apparatus of an electric drive and power system that provides a means for outputting both mechanical power and electrical power. It comprises dual motor/generators having two stator assemblies, two rotor assemblies and a power transmission unit all integrated into a single housing for easy mounting. The power transmission unit is disposed adjacent to the two motor/generators and coupled on both ends to rotating shafts mechanically linked to the rotor assemblies such that they are rotatable relative to each other. It function is to change the rotational speed and torque of at least one of the rotors in order to reduce weight and physical size of the apparatus, and thus significantly improving the power density and capability. The structure of the apparatus is well-suited to improve the performance and fuel efficiency of the prior art hybrid powertrain.

Abstract: Disclosed in the present invention is a tandem starter-generator construction that includes an induction motor-generator, a permanent magnet motor-generator and power transmission unit disposed adjacent to the motor-generators. The induction motor-generator is utilized predominantly as a motor to provide mechanical power at relatively high efficiency as a motor, and as a generator to provide electrical power during regenerative braking. The permanent magnet motor-generator is used predominantly as a generator for very high efficiency power conversion and to capture additional electrical power during regenerative braking to compensates for the regenerative energy captured at lower efficiency by the induction motor-generator.

Abstract: Disclosed in the present invention is a dual-structured power output apparatus of an electric drive and power system that provides a means for outputting both mechanical power and electrical power. It comprises dual motor/generators having two stator assemblies, two rotor assemblies and a power transmission unit all integrated into a single housing for easy mounting. The power transmission unit is disposed adjacent to the two motor/generators and coupled on both ends to rotating shafts mechanically linked to the rotor assemblies such that they are rotatable relative to each other. It function is to change the rotational speed and torque of at least one of the rotors in order to reduce weight and physical size of the apparatus, and thus significantly improving the power density and capability. The structure of the apparatus is well-suited to improve the performance and fuel efficiency of the prior art hybrid powertrain.

Abstract: Disclosed in the present invention is a tandem starter-generator construction that includes an induction motor-generator, a permanent magnet motor-generator and power transmission unit disposed adjacent to the motor-generators. The induction motor-generator is utilized predominantly as a motor to provide mechanical power at relatively high efficiency as a motor, and as a generator to provide electrical power during regenerative braking. The permanent magnet motor-generator is used predominantly as a generator for very high efficiency power conversion and to capture additional electrical power during regenerative braking to compensates for the regenerative energy captured at lower efficiency by the induction motor-generator.

Abstract: Disclosed in the present invention is a tandem starter-generator construction that includes an induction motor-generator, a permanent magnet motor-generator and power transmission unit disposed adjacent to the motor-generators. The induction motor-generator is utilized predominantly as a motor to provide mechanical power at relatively high efficiency as a motor, and as a generator to provide electrical power during regenerative braking. The permanent magnet motor-generator is used predominantly as a generator for very high efficiency power conversion and to capture additional electrical power during regenerative braking to compensates for the regenerative energy captured at lower efficiency by the induction motor-generator.

Abstract: Disclosed in the present invention is a shaft construction for motor-generators and alternators that provides effective airflow and improved overall cooling without the need for an external fan. The shaft comprises a plurality of circumferentially disposed centrifugal fan blades and longitudinal cooling channels. As the shaft rotates, the centrifugal fan blades pull the air inwardly across the winding end-turns on one end of the stator into the housing and propels the w at high pressure through the cooling channels along the shaft to cool the rotor diner circumferential surfaces, winding end-turns on the other end of the stator and bearings mounting surfaces, and exhausts through the exhaust vents on the ends of the housing. The airflow path provides effective cooling of the stator windings, rotor, shaft and bearings that prevents high temperature gradients, thus resulting in improved motor-generator performance.

Abstract: Disclosed in the present invention is a tandem starter-generator construction that includes an induction motor-generator, a permanent magnet motor-generator and power transmission unit disposed adjacent to the motor-generators. The induction motor-generator is utilized predominantly as a motor to provide mechanical power at relatively high efficiency as a motor, and as a generator to provide electrical power during regenerative braking. The permanent magnet motor-generator is used predominantly as a generator for very high efficiency power conversion and to capture additional electrical power during regenerative braking to compensates for the regenerative energy captured at lower efficiency by the induction motor-generator.

Abstract: Disclosed in the present invention is a dual-structured power output apparatus of an electric drive and power system that provides a means for outputting both mechanical power and electrical power. It comprises dual motor/generators having two stator assemblies, two rotor assemblies and a power transmission unit all integrated into a single housing for easy mounting. The power transmission unit is disposed adjacent to the two motor/generators and coupled on both ends to rotating shafts mechanically linked to the rotor assemblies such that they are rotatable relative to each other. It function is to change the rotational speed and torque of at least one of the rotors in order to reduce weight and physical size of the apparatus, and thus significantly improving the power density and capability. The structure of the apparatus is well-suited to improve the performance and fuel efficiency of the prior art hybrid powertrain.