Disclosed is a dual motor unit for a flywheel mass accumulator, with at least two electric machines coupled to a common rotary body; wherein the electric machines have different power characteristics and the dual motor unit is adapted to provide a total operating power in an operating speed range (?) by an interaction of the electric machines. The power characteristic (P.sub.max) is non-linearly dependent on a rotational speed (?) of the common rotary body.

Disclosed is a dual motor unit for a flywheel mass accumulator, with at least two electric machines coupled to a common rotary body; wherein the electric machines have different power characteristics and the dual motor unit is adapted to provide a total operating power in an operating speed range (?) by an interaction of the electric machines. The power characteristic (P.sub.max) is non-linearly dependent on a rotational speed (?) of the common rotary body.

A power system may include a first motor, a second motor connected in parallel to the first motor, a driver configured to supply a driving current to the first motor and the second motor and a controller configured to control the driver based on the driving current and a rotating speed of the first motor, and when the rotating speed of the first motor is different from a rotating speed of the second motor, the controller may control the driver so that the rotating speed of the first motor is equal to the rotating speed of the second motor. The power system may drive two and more motors at the same speed by applying the driving voltage based on the rotating speed and the driving current of one of two or more motors, using a single driving apparatus.

A power system may include a first motor, a second motor connected in parallel to the first motor, a driver configured to supply a driving current to the first motor and the second motor and a controller configured to control the driver based on the driving current and a rotating speed of the first motor, and when the rotating speed of the first motor is different from a rotating speed of the second motor, the controller may control the driver so that the rotating speed of the first motor is equal to the rotating speed of the second motor. The power system may drive two and more motors at the same speed by applying the driving voltage based on the rotating speed and the driving current of one of two or more motors, using a single driving apparatus.

An electronic speed control system and method is disclosed to control motors that power a load. The electronic speed control system is configured to monitor the motors, accept user commands for the motors, to process these inputs along with various motor parameters and/or models, and to generate motor commands to send to the motors. A field oriented control method continuously monitors voltages and currents from each motor phase; accesses the motor parameters; uses a model of the motor to calculate motor rotor flux, angle and speed based on the stator voltages and currents and the motor parameters; and generates motor commands for controlling the motor based on the user commands and the calculated values. The electronic speed control system can also control external accessories, and/or communicate with external applications which can include a motor identification system that can provide the motor parameters and model for the motor.

An electronic speed control system and method is disclosed to control motors that power a load. The electronic speed control system is configured to monitor the motors, accept user commands for the motors, to process these inputs along with various motor parameters and/or models, and to generate motor commands to send to the motors. A field oriented control method continuously monitors voltages and currents from each motor phase; accesses the motor parameters; uses a model of the motor to calculate motor rotor flux, angle and speed based on the stator voltages and currents and the motor parameters; and generates motor commands for controlling the motor based on the user commands and the calculated values. The electronic speed control system can also control external accessories, and/or communicate with external applications which can include a motor identification system that can provide the motor parameters and model for the motor.

A power system may include a first motor, a second motor connected in parallel to the first motor, a driver configured to supply a driving current to the first motor and the second motor and a controller configured to control the driver based on the driving current and a rotating speed of the first motor, and when the rotating speed of the first motor is different from a rotating speed of the second motor, the controller may control the driver so that the rotating speed of the first motor is equal to the rotating speed of the second motor. The power system may drive two and more motors at the same speed by applying the driving voltage based on the rotating speed and the driving current of one of two or more motors, using a single driving apparatus.

A power system may include a first motor, a second motor connected in parallel to the first motor, a driver configured to supply a driving current to the first motor and the second motor and a controller configured to control the driver based on the driving current and a rotating speed of the first motor, and when the rotating speed of the first motor is different from a rotating speed of the second motor, the controller may control the driver so that the rotating speed of the first motor is equal to the rotating speed of the second motor. The power system may drive two and more motors at the same speed by applying the driving voltage based on the rotating speed and the driving current of one of two or more motors, using a single driving apparatus.

A control device includes an ECU and an inverter device having power circuitry including an inverter and a motor control unit. A rotation angle sensor detects a rotation angle of a motor. The power circuitry receives a rotation angle of the motor from the rotation angle sensor to perform control in accordance with the rotation angle of the rotor, the control being based on a torque command mapping table in which a relationship between a rotation speed and a torque of the motor is defined. The power circuitry includes an adjustment module adjusting the torque command mapping table with respect to a torque command from the ECU and a speed of the electric vehicle.

A control device includes an ECU and an inverter device having power circuitry including an inverter and a motor control unit. A rotation angle sensor detects a rotation angle of a motor. The power circuitry receives a rotation angle of the motor from the rotation angle sensor to perform control in accordance with the rotation angle of the rotor, the control being based on a torque command mapping table in which a relationship between a rotation speed and a torque of the motor is defined. The power circuitry includes an adjustment module adjusting the torque command mapping table with respect to a torque command from the ECU and a speed of the electric vehicle.