ELECTRIC AUTOMOBILE

• Main Authors: HAYAKAWA MASAFUMI, HAYASHI KAZUHITO, ASAKAWA KOJIRO
• Format: Patent
• Language: English; Japanese
• Published: 24.01.2023
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRIC EQUIPMENT OR PROPULSION OF ELECTRICALLY-PROPELLEDVEHICLES; ELECTRICITY; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES, IN GENERAL; GENERATION; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; PERFORMING OPERATIONS; TRANSPORTING; VEHICLES IN GENERAL

To provide a technique for reducing a power loss caused by a resonance of two motors in an electric automobile having the two motors for traveling.SOLUTION: An electric automobile includes a first motor and a second motor both for traveling, a DC power source, a step-up converter, an inverter, a smoothing capacitor, and a controller. The smoothing capacitor is connected between a DC terminal of the inverter and a ground wire. The controller controls the step-up converter and the inverter. The causes the step-up converter to function at a step-up ratio exceeding 1 in a case where an operating point of the first motor is within a specific range when a switching element on a ground side of the step-up converter is retained at Off, and a frequency of an AC current flowing through the first motor and a frequency of an AC flowing through the second motor meet a relation of an integral multiple.SELECTED DRAWING: Figure 6 【課題】本明細書は、走行用に２個のモータを有する電気自動車において、２個のモータの共振に起因する電力損失を小さくする技術を提供する。【解決手段】本明細書が開示する電気自動車は、走行用の第１モータと第２モータ、直流電源、昇圧コンバータ、インバータ、平滑コンデンサ、制御器を備える。平滑コンデンサは、インバータの直流端とグランド線の間に接続されている。制御器は、昇圧コンバータとインバータを制御する。制御器は、昇圧コンバータのグランド側のスイッチング素子をオフに保持しているときに、第１モータの動作点が特定領域内にあり、かつ、第１モータに流れる交流電流の周波数と第２モータに流れる交流の周波数が整数倍の関係を満たしたら、１を超える昇圧比で昇圧コンバータを作動させる。【選択図】図６