A vehicular power system includes a battery disposed at a vehicle, an electrical motor disposed at the vehicle that controls propulsion of the equipped vehicle when powered, a power system controller, and a transformer electrically connected to the battery. The transformer includes a plurality of taps, each tap of the plurality of taps providing a different output voltage. The power system controller, responsive to a vehicle speed request, determines one of the plurality of taps. The power system controller electrically connects the determined one of the plurality of taps to the electrical motor, and electrical power flows from the battery through the determined one of the plurality of taps to the electrical motor. The electrical motor, based on the electrical power from the determined one of the plurality of taps, adjusts speed of propulsion of the equipped vehicle toward the requested vehicle speed.

A vehicular power system includes a battery disposed at a vehicle, an electrical motor disposed at the vehicle that controls propulsion of the equipped vehicle when powered, a power system controller, and a transformer electrically connected to the battery. The transformer includes a plurality of taps, each tap of the plurality of taps providing a different output voltage. The power system controller, responsive to a vehicle speed request, determines one of the plurality of taps. The power system controller electrically connects the determined one of the plurality of taps to the electrical motor, and electrical power flows from the battery through the determined one of the plurality of taps to the electrical motor. The electrical motor, based on the electrical power from the determined one of the plurality of taps, adjusts speed of propulsion of the equipped vehicle toward the requested vehicle speed.

A current supply system configured to receive a rotational driving force and supply a current for driving an electrical load device in accordance with a current requirement. The current supply system includes a rotor, including a permanent magnet, configured to receive the rotational driving force, and a stator including a stator core with a winding wound thereon, a magnetic circuit for the winding passing through the stator core, the rotational driving force causing the rotor and the stator to generate the current. The current supply system further includes a supply current adjustment device configured to change magnetic resistance of the magnetic circuit for the winding in accordance with the current requirement, to thereby change an inductance of the winding to adjust the generated current.

A current supply system configured to receive a rotational driving force and supply a current for driving an electrical load device in accordance with a current requirement. The current supply system includes a rotor, including a permanent magnet, configured to receive the rotational driving force, and a stator including a stator core with a winding wound thereon, a magnetic circuit for the winding passing through the stator core, the rotational driving force causing the rotor and the stator to generate the current. The current supply system further includes a supply current adjustment device configured to change magnetic resistance of the magnetic circuit for the winding in accordance with the current requirement, to thereby change an inductance of the winding to adjust the generated current.

A propulsion system includes plural inverters configured to be onboard a vehicle and to convert direct current into an alternating current, and plural motors configured to receive the alternating current from the inverters. The motors also are configured to be operably coupled with axles of the vehicle to rotate the axles. The inverters are configured to be coupled with and control the motors that rotate non-neighboring axles of the axles in the vehicle.

A propulsion system includes plural inverters configured to be onboard a vehicle and to convert direct current into an alternating current, and plural motors configured to receive the alternating current from the inverters. The motors also are configured to be operably coupled with axles of the vehicle to rotate the axles. The inverters are configured to be coupled with and control the motors that rotate non-neighboring axles of the axles in the vehicle.

A transmission for outputting a rotational torque in accordance with a torque requirement. The transmission includes a generator, a motor and a control device. The generator includes a rotor configured to receive first rotational power from an engine, a stator including a stator core with a winding wound thereon, a magnetic circuit for the winding passing through the stator core, and a supply current adjustment device configured to adjust magnetic resistance of the magnetic circuit for the winding, to thereby change an inductance of the winding to adjust a current outputted by the generator. The motor is driven by the current outputted from the generator, to thereby output second rotational power. The control device controls the supply current adjustment device to change the inductance of the winding, in accordance with the torque requirement.

A transmission for outputting a rotational torque in accordance with a torque requirement. The transmission includes a generator, a motor and a control device. The generator includes a rotor configured to receive first rotational power from an engine, a stator including a stator core with a winding wound thereon, a magnetic circuit for the winding passing through the stator core, and a supply current adjustment device configured to adjust magnetic resistance of the magnetic circuit for the winding, to thereby change an inductance of the winding to adjust a current outputted by the generator. The motor is driven by the current outputted from the generator, to thereby output second rotational power. The control device controls the supply current adjustment device to change the inductance of the winding, in accordance with the torque requirement.

An electric drive system for mechanical machinery. The electric drive system includes a first electrical bus and a second electrical bus each configured to operate at different voltages. A first generator is configured to provide electric current to the first electrical bus at a first voltage. A second generator is configured to provide electric current to the second electrical bus at a second voltage that is different from the first voltage. A first electric motor is coupled to the first electrical bus and configured to operate on electrical power from the first electrical bus at the first voltage. A second electric motor is coupled to the second electrical bus and configured to operate on electrical power from the second electrical bus at the second voltage. Mechanical power used to drive the mechanical machinery is generated by both the first electric motor and the second electric motor.

An electric power supply system configured to supply electric power to an electrical load device in accordance with a current requirement. The electric power supply system includes an engine configured to output rotational power, a generator configured to receive the rotational power and to supply a current to the electrical load device. The generator includes a rotor, and a stator including a winding and a stator core with the winding wound thereon, a magnetic circuit for the winding passing through the stator core, and a supply current adjustment device configured to adjust magnetic resistance of the magnetic circuit for the winding, to thereby change an inductance of the winding to adjust the supplied current. The electric power supply system further includes a control device configured to control the engine to adjust the output rotational power and to control the supply current adjustment device to adjust the inductance of the winding.