This invention provides a brushless dc dynamo, which is characterized by using semiconductor switches to replace commutators used in conventional brush DC dynamo, wherein the periodically mechanical contact of the armature and different electrodes are replaced with static electronic switching array to periodically switch electrically without any mechanical contact switching between the armature and electrodes. Meanwhile, the armature can work as conventional mode to always maintain the distribution of the armature current such that the magnetic field of the rotator is perpendicular to the magnetic field of the stator during rotating, and the damage of switched contacts caused by mechanical contact of the armature and electrodes can be avoided.

A system comprising a high voltage (HV) bank section using capacitors arranged into two banks, a multifilar inductor coupling the HV bank to a service voltage (SV) bank section and load through a charging circuit charging the SV bank from a more fully charged bank until the charging bank is depleted, and a switch switching, from the depleted bank to the other bank of bank to charge the SV bank. The charging circuit then charging the depleted bank by a power supply as the other HV bank charges the SV bank. A supervisory controller controls the switch to repeat switching and charging between the two banks for a defined period. The capacitors may be supercapacitors having a capacitance on the order of 1 to 10 MegaJoules.

A vehicle drive includes a gear set, a first motor/generator coupled to the gear set, a second motor/generator at least selectively rotationally engaged with the gear set, and an engine at least selectively coupled to the gear set and at least selectively coupled to the second motor/generator. The second motor/generator is electrically coupled to the first motor/generator by an electrical power transmission system. The first motor/generator and the second motor/generator are electrically coupled without an energy storage device configured to at least one of (a) provide electrical energy to the first motor/generator or the second motor/generator to power the first motor/generator or the second motor/generator and (b) be charged by electrical energy from the first motor/generator or the second motor/generator.

A vehicle drive includes a gear set, a first motor/generator coupled to the gear set, a second motor/generator at least selectively rotationally engaged with the gear set, and an engine at least selectively coupled to the gear set and at least selectively coupled to the second motor/generator. The second motor/generator is electrically coupled to the first motor/generator by an electrical power transmission system. The first motor/generator and the second motor/generator are electrically coupled without an energy storage device configured to at least one of (a) provide electrical energy to the first motor/generator or the second motor/generator to power the first motor/generator or the second motor/generator and (b) be charged by electrical energy from the first motor/generator or the second motor/generator.

A drive device, having a first electric machine operable as a generator and a second electric machine operable as a motor, which are electrically connected to one another, so that the second electric machine is operable using electric energy provided by the first electric machine, wherein an energy accumulator for temporarily storing electric energy is electrically connected to the first electric machine and the second electric machine. It is provided in this case that the first electric machine and the second electric machine are electrically directly connected to one another via an intermediate circuit, wherein the energy accumulator is electrically connected to the intermediate circuit via a switch arrangement both directly and also indirectly via a voltage converter. The disclosure furthermore relates to a method for operating a drive device.

According to an embodiment of the present invention, there is provided a low voltage compensation system for a micro electric vehicle including: a motor configured to drive a micro electric vehicle; a motor control unit configured to control the motor and supply power received from a main battery to the motor; a main battery configured to supply the power to the motor control unit; and a sub battery for compensating for a voltage of the main battery. According to the present invention, it is possible to prevent an output reduction due to a low voltage of the main battery by compensating for a dropped voltage of the main battery using the sub battery when the voltage of the main battery is dropped below a reference value by adding the sub battery in addition to the main battery, thereby efficiently and stably operating the micro electric vehicle.

According to an embodiment of the present invention, there is provided a low voltage compensation system for a micro electric vehicle including: a motor configured to drive a micro electric vehicle; a motor control unit configured to control the motor and supply power received from a main battery to the motor; a main battery configured to supply the power to the motor control unit; and a sub battery for compensating for a voltage of the main battery. According to the present invention, it is possible to prevent an output reduction due to a low voltage of the main battery by compensating for a dropped voltage of the main battery using the sub battery when the voltage of the main battery is dropped below a reference value by adding the sub battery in addition to the main battery, thereby efficiently and stably operating the micro electric vehicle.

This invention provides a brushless dc dynamo, which is characterized by using semiconductor switches to replace commutators used in conventional brush DC dynamo, wherein the periodically mechanical contact of the armature and different electrodes are replaced with static electronic switching array to periodically switch electrically without any mechanical contact switching between the armature and electrodes. Meanwhile, the armature can work as conventional mode to always maintain the distribution of the armature current such that the magnetic field of the rotator is perpendicular to the magnetic field of the stator during rotating, and the damage of switched contacts caused by mechanical contact of the armature and electrodes can be avoided.

An electric vehicle allows a user to experience changes in acceleration g-force, as with a conventional power plant, including: a transmission that sets a gearshift position based on a gearshift position command value to be supplied, and reduces a rotation speed of a motor with the gear ratio based on the gearshift position to rotationally drive wheels; a user operation unit that outputs the gearshift position command value and a speed control amount, based on user operation; and a controller that sets a DC voltage command value or an AC voltage command value to an operation-based value corresponding to the gearshift position and the speed control amount, and, on the condition that operation on the user operation unit satisfies a predetermined condition, sets the DC voltage command value or the AC voltage command value to a value higher than the operation-based value for causing a change in acceleration.

A hybrid propulsion system can include an electric motor configured to convert electrical energy into motion, a battery configured to store electrical energy and operatively connected to the electric motor to provide a battery output to the electric motor and a generator configured to convert non-electrical energy into electrical energy, the generator operatively connected to the electric motor to provide a generator output to the motor simultaneously with the battery output. The system can include a controller operatively connected to the generator and configured to control the generator output of the generator as a function one or more of a state of the battery or the battery output.