Electrical network & # 8203; In the domestic new energy policy's support vigorously, the various auto enterprises have developed their own electric model, we in the car, all kinds of motor emerged. In what is now the new energy car category, permanent magnet synchronous motor is widely used, small make up this and we speak about why the auto enterprises of permanent magnet synchronous motor & other; Have a special liking & throughout; 。 On market now, from the mature technology of motor, permanent magnet synchronous motor is used more widely, such as kia K5 hybrid, roewe E50, teng potential, baic EU260, etc. Tesla Model, the Model S X selects the asynchronous motor. Through the form below, we can first introduce roughly three kinds of comparatively typical motor characteristics. Three types of motor performance compare performance and permanent magnet synchronous motor speed range/dc motor asynchronous motor RPM - 40006000, 12000 -20000 >15000 high power density in the low weight heavy light volume of small poor reliability in good general structure poor robustness good controller of low cost high high, in the early period of the dc motor in electric cars, most of the electric car use dc motor as drive motor. More skilled in this type of motor, no protection, speed characteristics, once has the most widely used in speed governing motor category, usually as an introduction to electric vehicle of choice. But the speed of the dc motor is widely, and maximum speed is 6000 RPM only left and right sides, the speed characteristic is hard to meet the demand of working condition of electric vehicles. So, some vendors after matching for its secondary reducer or has a certain scale transmission gear ratio of CVT transmission to compensate the short of dc motor in terms of speed. Obviously, such technical structure in the space and weight control effects on vehicle planning has a walking stick. Of course, also can only for a single stage reducer motor matching, but the vehicle dynamic performance and the highest speed will be affected. This is why the dc motor generally appear in the small may be tiny electric car. 2 the strengths of the asynchronous motor, asynchronous motor is of low cost, secure technology briefly, by the use, convenient repair, and is able to bear working temperature change significantly. The size of its speed widely and peak speeds of up to 20000 RPM, even if does not match the secondary differential can also meet the demand of high-speed cruise vehicle speed. But the defect is weight and volume of the asynchronous motor slants big, in the life journey has a crucial influence on electric vehicles today, tesla is chosen in addition to the firm by using asynchronous motor, to oneself life also have meet the pride of the battery. Third, permanent magnet synchronous motor in the new energy car category, permanent magnet synchronous motor is widely used. The so-called permanent magnet, it is to point to in the production of motor rotor when attend permanent magnets, make a further improvement of the performance of the motor. And the so-called synchronization, refers to the speed of the rotor and stator winding current frequency has always been consistent. Therefore, through the control of the motor stator winding input current frequency, electric car speed will eventually be manipulated. Compared with other types of motors, the greatest strength permanent magnet synchronous motor is compared with other types of motor, under the same quality and volume, the permanent magnet synchronous motor can to supply new energy cars with maximum power output and acceleration. This is also in the new energy of high requirements for space and weight of car industry, car companies choose the main reason for the permanent magnet synchronous motor. In fact, the structure of the permanent magnet synchronous motor with similar to dc motor that stated above, this can be a brushless dc motor structure brief, stable operation, large power density, high performance is good wait for a characteristic. At the same time, because of the permanent magnet synchronous motor is chosen driving method differs from dc motor, so on noise and control link, permanent magnet synchronous motor. However, permanent magnet synchronous motor has the defect of itself. Rotor of permanent magnet material under the condition of high temperature, vibration and flow, produce the phenomenon of magnetic body, so I work in a relatively clutter condition, the motor is easy to damage. And permanent magnet material price is higher, so the cost of the motor and its control system is higher. Article summary: from the point of technology advantage now, permanent magnet synchronous motor into the mainstream. But work is not so sure, although in terms of weight and volume, asynchronous motor is not dominant, but its speed widely broad in scale, low cost, process short, stable operation. As for the component's influence on the life journey, if the future battery life journey greatly add volume, asynchronous motor optimization done well, is bound to the permanent magnet synchronous motor to form strong impact.
