At present, China's electric vehicle drive system is used in the DC motor drive system, DC motor has the advantages of simple structure, high control performance, wide speed range, the control circuit is relatively simple, low cost, energy transmission is the use of one-way transmission mode, the battery to the power converter to drive motor, such models exist many deficiencies. The one-way power transmission so that the vehicle brake when decelerating or coasting downhill wasted a lot of energy. In addition, there exist the following disadvantages:
1, Brush
DC motor due to the presence of a reversing machinery parts brush and commutator, easily lead to spark, noise and vibration, electromagnetic interference problems
2, Brush and commutator maintenance more difficult, short service life
3, In the volume of the motor is very huge, resulting in limited space waste
4, Brushless DC motor rotor position detection is difficult, the price is high, and the cost is relatively low
Electric vehicle motor drive system is a kind of torque control system, the driver needs to control the torque to realize vehicle starting, acceleration, deceleration and a series of operations, and need regular maintenance, and maintenance more difficult, and to generate sparks, especially on radio interference, and the future of electric car will enter the highly intelligent era, electric vehicle motor driving system of these shortcomings will be fatal weakness. In addition, the DC motor of high manufacturing cost, large weight, high energy density, therefore, will hinder the DC motor supplier in electric vehicle application. In the era of new energy, energy saving of the electric motor drive system will become the mainstream of the future, in the high efficiency, low loss, high reliability of the products will lead the market development, we hope that, with the development of technology and the progress of Chinese market, there will be more and more high performance, environmentally friendly products.
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