The electric air-conditioning system is a general term for an air-conditioning system using an electric compressor. The power battery is the power source of the electric vehicle and the driving source of the electric compressor. Common electric vehicles use electric compressor refrigeration systems for refrigeration. Compared with the traditional engine drive, the electric motor drive has higher energy utilization rate, and the air conditioning system is an auxiliary system that consumes a lot of energy in the car, accounting for almost 70% of the auxiliary system power consumption.

DC servo controller adopts all-round protection design, with high efficiency transmission performance: high control accuracy, good linearity, smooth operation, reliable, fast response time, full isolation control, etc., especially in low speed operation. Torque and good performance, in some occasions (low speed, high torque, high linearity of action) compared with AC brushless servo, it can show its excellent characteristics, and is widely used in various transmission machinery and equipment .

As we all know, brushless DC motors use permanent magnet materials to excite instead of electro-excitation, under the same working conditions, small size and light weight. And brushless motors have the advantages of high efficiency, energy saving, good control characteristics, high reliability, long life, low noise, etc., and are replacing AC motors in more and more fields. In terms of speed regulation, the brushless DC motor can achieve stepless speed regulation from 0 to the rated speed, which can greatly facilitate the user to select the appropriate speed and increase the comfort of the product. DC frequency conversion realizes soft start, and realizes double reduction of starting noise and running noise. Energy saving has become the future development direction, and DC brushless motors have a lot of room for energy saving. Through experiments, AC asynchronous motors require 180W input power under the same air volume, while DC motors only require 80W. DC motors are more than 50% more efficient than AC motors. Due to the permanent magnet structure, the brushless DC motor weighs only 70% of the AC motor. When operating at full speed at room temperature, the motor temperature rise is only 50% of the AC motor. The application of DC brushless speed control system has been very mature at present, and the reliability of the system has also been verified in many products.