黑龍江工程學(xué)院本科生畢業(yè)設(shè)計(jì)
附 錄
附錄A
Power motor for EPS provide the power, the power source of the system is EPS, according to the instructions of the unit, and the output ECU for the aid of torque. Power motor performance in largely decided to the EPS system performance, so EPS system to motor performance requirements of the high. Compared to normal motor, electric power steering system with the motor should have the following characteristics. First of all because most vehicle power supply for 12 V dc, therefore, ask dc motor power supply electricity down and have big rated current of the rated power; and Secondly, the volume as low as possible, inertia, wide range of speed regulation of small, control characteristic, smooth operation, and low torque fluctuation little, low speed. High speed, big gear ratio will increase of mechanical system, the influence of system dynamic performance inertia; In turn blocking when can also provide power torque. For large vehicles, or even should be able to provide the opposite direction of power and rotational torque.
附錄B
助力電機(jī)為EPS提供動(dòng)力，是EPS系統(tǒng)的動(dòng)力源，它根據(jù)ECU單元的指令，輸出適宜的助力轉(zhuǎn)矩。助力電機(jī)的性能在很大程度上便決定了整個(gè)EPS系統(tǒng)的性能，因此EPS系統(tǒng)對(duì)電動(dòng)機(jī)的性能要求很高。相對(duì)普通電動(dòng)機(jī)，電動(dòng)助力轉(zhuǎn)向系統(tǒng)用電機(jī)應(yīng)該具有以下特點(diǎn)。首先由于絕大多數(shù)車載電源為12V直流，因此要求直流電機(jī)供電電壓低，并且具有大的額定電流和額定功率;其次，體積盡量小，轉(zhuǎn)動(dòng)慣量小，寬廣的調(diào)速范圍，控制特性好，低速運(yùn)行平穩(wěn)，力矩波動(dòng)小，轉(zhuǎn)速低。高轉(zhuǎn)速下，大的齒輪傳動(dòng)比將會(huì)增加系統(tǒng)的機(jī)械慣量，影響系統(tǒng)動(dòng)態(tài)性能;在堵轉(zhuǎn)時(shí)也能提供助力轉(zhuǎn)矩。對(duì)于大型車輛，甚至應(yīng)該能夠提供與轉(zhuǎn)動(dòng)方向相反的助力轉(zhuǎn)矩。
2