跳至主要内容

The main performance requirements of electric vehicle driving motor

(1) high torque density and power density, small size and light weight
(2) high efficiency in the whole operation range
(3) low speed and large torque characteristics and constant power characteristics in a wide range.In order to meet the requirements of starting, accelerating, driving, decelerating and braking power and torque, it should have a large starting torque and a wide range of speed regulation performance.Should have the automatic speed regulation function, reduces the control intensity, enhances the comfortability, achieves the internal combustion engine automobile same control response.
(4) high reliability, large overload capacity. 
(5) high voltage.The main advantages are that it can reduce the size of the motor, reduce the cost of the inverter and improve the energy conversion efficiency.
(6) high safety of electrical system.
(7) high speed.In the case of a certain torque, increasing the speed can improve the power.
In addition, the electric motors of electric cars are required to have strong resistance to high temperature and humidity, low noise during operation, and be able to work for a long time in a harsh environment. They are required to have features such as simple motor structure, suitable for mass production, and convenient use and maintenance of motors.
(8) can double as a generator.In order to reduce the weight of the car and save space, most of the motors can be used as generators to recover energy when the car is braking and decelerating.

评论

发表评论

此博客中的热门博文

A detailed explanation of the causes of excessive three-phase motor current

When the motor current is high, it is often reflected in the serious heating of the motor. The following seven points basically summarize the reasons for the excessive current of the motor. Let's learn about them. Ⅰ. power supply problem In terms of power supply, the motor may overheat for the following reasons: 1, the power supply voltage is too high When the power supply voltage is too high, the electromotive force, flux and flux density of the motor increase accordingly. Since the size of iron loss is proportional to the square of magnetic flux density, the iron loss increases, leading to overheating of the core. The increase of magnetic flux leads to the sharp increase of excitation current component, resulting in the increase of copper loss of stator windings and overheating of windings. Therefore, when the power supply voltage exceeds the motor's rated voltage, the motor will overheat. 2. Too low power supply voltage When the power supply voltage is...
发表评论
阅读全文

Advantages and disadvantages of rare earth permanent magnet synchronous motor compared with squirrel-cage asynchronous motor

A ：high efficiency and energy saving 1) no slip error, no fundamental wave loss of iron and copper on the rotor; 2) the rotor permanent magnet is used for excitation, and the power factor can reach 1, saving the reactive power. On the other hand, the stator current decreases, the stator copper loss decreases, and the efficiency increases. 3) the polar arc coefficient is generally greater than the polar arc coefficient of the asynchronous motor. When the power supply voltage and the stator structure are fixed, the average magnetic density is smaller than the asynchronous motor and the iron loss is smaller. 4) stray loss of rare earth permanent magnet synchronous motor: it is generally believed that the non-sinusoidal magnetic field of the permanent magnet increases the stray loss, but on the other hand, the large air gap of the rare earth permanent magnet synchronous motor reduces the stray loss. B ：small size, light weight, high power density 1) analysis from the persp...
发表评论
阅读全文

Interpretation of the standard of motor working system

1. Interpretation of the standard of motor working system The operating system of the motor indicates the permissible cycle time of the motor under different loads. The classification of the working system of the motor is the description of the load bearing condition of the motor, which includes the starting, electric braking, no-load, break-energy stopping and the duration and sequence of these stages. Iec60034-1 divides the working system into 10 categories. (1) continuous operation, S1. Continuous running S1 is an operation with constant load that lasts long enough to achieve thermal equilibrium. (2) short run, S2. A short run is a run with a load that is too short to achieve thermal balance. The interval (no voltage applied on the motor) is very long, which has actually reduced the motor temperature to the temperature of the cooling medium. The recommended duration of short operation is 10min, 30min, 60min and 90min. (3) start intermittent operation with no influ...
发表评论
阅读全文