What are the “big three electrics” of new energy vehicles?

       The big three electric vehicles of new energy sources include: power battery , motor and motor controller. Today we will talk about the motor controller in the big three power.

　　In terms of definition, according to GB/T18488.1-2015 “Drive Motor System for Electric Vehicles Part 1: Technical Conditions”, motor controller: a device that controls the energy transmission between the power supply and the drive motor, controlled by the signal interface circuit , Drive motor control circuit and drive circuit.

　　In terms of function, the new energy electric vehicle controller converts the direct current of the new energy electric vehicle power battery into the alternating current of the driving motor, communicates with the vehicle controller through the communication system, and controls the speed and power required by the vehicle.

　　Analysis from the outside to the inside, the first step: From the outside, the motor controller is an aluminum box, a low-voltage connector, a high-voltage bus connector composed of two holes, and a three-phase connection to the motor composed of three holes. Connectors (all-in-one connectors do not have three-phase connectors), one or more breather valves and two water inlets and outlets. There are generally two covers on the aluminum box, one of which is a large cover and the other is a wiring cover. The large cover can fully open the controller, and the wiring cover is used to connect the controller bus connector and three-phase connector. use.

　　From the inside, when the controller opens the cover, it is the internal structure and electronic components of the entire motor controller. Some controllers will place a cover opening protection switch on the wiring cover according to customer needs when opening the cover.

　　The interior mainly includes: three-phase copper bar, bus bar copper bar, copper bar support frame, three-phase and bus bar wiring bracket, EMC filter board, bus capacitor, control board, driver board, adapter board, IGBT, current sensor , EMC magnetic ring and discharge resistors, etc.