Rotary electric machine driving device
AssigneeAisin Aw Co., Ltd.
InventorsSubrata Saha, Arinori Shimada
Life of this patent
Estimating the term…
Abstract
A rotary electric machine driving device that drives and controls an alternating-current rotary electric machine, the rotary electric machine driving device including: an inverter that is electrically interposed between a direct-current power supply and the rotary electric machine, and converts electric power between a direct current and an alternating current; a smoothing capacitor that is electrically interposed between the direct-current power supply and the inverter, and is connected between a positive pole and a negative pole on a direct-current side of the inverter; and an inverter control unit that controls switching of a switching element of the inverter according to a predefined switching frequency.
Claims15
A rotary electric machine driving device that drives and controls an alternating-current rotary electric machine, the rotary electric machine driving device comprising:
- an inverter that is electrically interposed between a direct-current power supply and the rotary electric machine, and converts electric power between a direct current and an alternating current;
- a smoothing capacitor that is electrically interposed between the direct-current power supply and the inverter, and is connected between a positive pole and a negative pole on a direct-current side of the inverter;
- and
- an inverter control unit that controls switching of a switching element of the inverter according to a predefined switching frequency, wherein
- the inverter control unit sets the switching frequency to a value varying corresponding to both torque and a rotating speed of the rotary electric machine, according to pulsation amplitude of a system voltage that is a voltage on the direct-current side of the inverter and pulsation amplitude of a power supply current that is a current flowing through the direct-current power supply, and
- the inverter control unit sets the switching frequency higher as rotary electric machine power or a modulation factor increases, the rotary electric machine power being calculated by multiplying the torque by the rotating speed of the rotary electric machine, the modulation factor representing a ratio of an effective value of an alternating-current voltage command value to a system voltage that is a voltage on the direct-current side of the inverter.
A rotary electric machine driving device that drives and controls an alternating-current rotary electric machine, the rotary electric machine driving device comprising:
- an inverter that is electrically interposed between a direct-current power supply and the rotary electric machine, and converts electric power between a direct current and an alternating current;
- a smoothing capacitor that is electrically interposed between the direct-current power supply and the inverter, and is connected between a positive pole and a negative pole on a direct-current side of the inverter;
- and
- an inverter control unit that controls switching of a switching element of the inverter according to a predefined switching frequency, wherein
- the inverter control unit sets the switching frequency to a value varying corresponding to both torque and a rotating speed of the rotary electric machine, according to pulsation amplitude of a system voltage that is a voltage on the direct-current side of the inverter, and
- the inverter control unit sets the switching frequency higher as rotary electric machine power or a modulation factor increases, the rotary electric machine power being calculated by multiplying the torque by the rotating speed of the rotary electric machine, the modulation factor representing a ratio of an effective value of an alternating-current voltage command value to a system voltage that is a voltage on the direct-current side of the inverter.
A rotary electric machine driving device that drives and controls an alternating-current rotary electric machine, the rotary electric machine driving device comprising:
- an inverter that is electrically interposed between a direct-current power supply and the rotary electric machine, and converts electric power between a direct current and an alternating current;
- a smoothing capacitor that is electrically interposed between the direct-current power supply and the inverter, and is connected between a positive pole and a negative pole on a direct-current side of the inverter;
- and
- an inverter control unit that controls switching of a switching element of the inverter according to a predefined switching frequency, wherein
- the inverter control unit sets the switching frequency to a value varying corresponding to both torque and a rotating speed of the rotary electric machine, according to pulsation amplitude of a power supply current that is a current flowing through the direct-current power supply, and
- the inverter control unit sets the switching frequency higher as rotary electric machine power or a modulation factor increases, the rotary electric machine power being calculated by multiplying the torque by the rotating speed of the rotary electric machine, the modulation factor representing a ratio of an effective value of an alternating-current voltage command value to a system voltage that is a voltage on the direct-current side of the inverter.
Dependencies are inferred from the claim text.