Publish Time: 2023-11-02 Origin: Site
Models equipped with asynchronous induction motors and permanent magnet synchronous motors are often seen on pure electric vehicles. So what are the advantages and disadvantages of these two motor technologies?
Here is the list
The energy transmission process of the power motor
Comparison of Characteristics of Asynchronous Induction Motor and Permanent Magnet Synchronous Motor
Asynchronous induction motors and permanent magnet synchronous motors have their own advantages
The energy transmission process of the power motor includes: the DC power of the energy storage system, and the DC power is converted into AC power under the power control of the power control system to provide the motor unit, and the rotor in the motor unit rotates under the action of the magnetic field generated by the AC power, thereby Converts electrical energy into mechanical rotational force, and outputs the rotational force to the gearbox unit through the output shaft. The gearbox unit decelerates the rotation through the cooperation of its internal gear mechanisms, and outputs it to the wheels after adjusting the differential gear. the half shaft. The two motor technologies can be clearly distinguished from the internal structure of an asynchronous induction motor and a permanent magnet synchronous motor. The rotor of the permanent magnet synchronous motor is a permanent magnet, abbreviated as PMSM in English. The rotor of the asynchronous induction motor is not a magnet but a closed coil, which is commonly known as a squirrel cage structure, or ACIM for short.
So what are the differences between asynchronous induction motors and domestic mainstream permanent magnet synchronous motors? First, asynchronous induction motors have higher speed limits, up to 15,000 rpm. And has stronger overload capacity, up to 5 times the rated value. At the same time, the asynchronous induction AC motor has the advantages of good structural sturdiness, low cost and good reliability. Of course, it also has shortcomings, that is, the peak efficiency of the highest 95% is slightly lower than the 97% of the permanent magnet synchronous AC motor. In addition, the external dimension of the motor is larger than that of the permanent magnet synchronous AC motor under the same power. Therefore, there is no difference between the two technologies. Instead, the corresponding motor technology is matched according to the characteristics of different models to find the optimal solution. Asynchronous induction motors have high performance characteristics. The NIO ES8 front and rear axles use two patented high-power induction motors. The motor power is further improved through the corresponding copper cage technology and motor water cooling technology.
In fact, the asynchronous induction motor and the permanent magnet synchronous motor have their own advantages, so the Weilai ES6 is equipped with two motor technologies at the same time to give full play to their respective advantages according to the working state. Asynchronous AC motors tending towards high-speed, high-performance performance are placed on the rear axle. The permanent magnet synchronous motor, which is biased towards low speed and high efficiency, is arranged on the front axle. The permanent magnet synchronous motor works at medium and low vehicle speeds, giving full play to its high-efficiency advantages to obtain longer pure electric battery life. The dual motors work at the same time in high-speed road conditions to optimize the vehicle's acceleration performance. When decelerating, it intelligently adjusts the motor according to the braking demand. In ordinary braking, the permanent magnet synchronous motor is used for braking energy recovery, and in rapid deceleration, the energy is recovered when the dual motors simultaneously provide braking torque.
Over 68 years of manufacturing experience of Hangzhou New Hengli Electric Machine MFG. Co., Ltd. in kinds of DC & AC Motors built up the customer-centered product development methodology and do under the special requirements of customers.