An
electric vehicle air conditioning compressor is an integrated unit comprising a controller, motor, and compression mechanism. The internal electronic components, motor, and compressor are fully isolated, while external high-voltage and low-voltage connectors are directly fixed to the housing. The assembly achieves an IP67 protection rating. A distinguishing feature is that the low-temperature refrigerant exiting the evaporator cools the electronic control components via the compressor housing.
Scroll technology: The
HV compressor employs scroll technology, using the relative orbital motion of fixed and orbiting scroll plates to create a continuously varying sealed volume, thereby achieving gas compression. The scroll stator and rotor have nearly identical spiral geometries, a phase difference of 180°, and a specific eccentricity.
Efficient compression: The interaction of the two scrolls forms four compression chambers, each crescent-shaped. During compression, the scroll stator (fixed plate) remains stationary, while the scroll rotor (orbiting plate) performs a clockwise orbital motion at 90° intervals. Gas within the chambers is compressed into high-pressure gas and expelled through a discharge port located at the center of the scrolls. This design is characterized by low noise, smooth operation, easy variable-speed movement, and adaptability to frequency modulation control technology.
Advanced control systems: The controller comprises electronic control components, a CAN transceiver, drive circuit, and protective circuit. During operation, the high- and low-voltage power supplies and communication signals are all connected to the controller. The electronic control module processes power and speed request signals sent by the air conditioning control system, outputting PWM duty cycle signals to achieve stepless motor power regulation. Additionally, the electronic control module transmits compressor temperature, speed, power, and fault information via the CAN bus, enabling signal acquisition, fault pre-warning, and protections against over-temperature, overvoltage/undervoltage, overcurrent, short circuit, and reverse polarity. The system's functional diagram is shown below.