Silver Atena has developed a control unit for controlling the speed of an air conditioning compressor engine (BLDC motor). The power part of the ECU is fed by a 300V power supply and is galvanically separated from the 12V on-board power supply of the vehicle. The efficiency of the control unit is approximately 96%.
Especially with electric vehicles, noise emission plays an important role: therefore, the motor control is handled by vector control (FOC).
The engine rotational speed is determined via a CAN interface. The ECU regulates the rotational speed up to a maximum of 10.000 Umin-1 taking into account the available on-board supply voltage. The adjustable rotational speed of the engine enables a more efficient and requirement-oriented operation of the air conditioning system.
The control unit supplies galvanic separation of the on-board power supply and extensive voltage monitoring. Moreover, the ECU provides high resistance against voltage fluctuations and against short circuits in low-voltage and high-voltage ranges. The commutation of the motor phases can be carried out sensorless or sensored via rotor position sensor. The sensorless commutation in the lower rotational speed range poses a particular challenge here.
Actuation of electric motors in automotive high-voltage networks, e.g. A/C compressors for electric and hybrid vehicles.
- FOC Control for BLDC motors
- Commutation w/ rotor position sensor
- Speed control up to 10.000 Umin-1)
- Supply of the power module from 300 V (on-board voltage)
- High resistance to voltage fluctuations
- Measurement of sensor signals (voltage, current, temperature)
- Communication via high-speed CAN
- High efficiency, low stand-by current
- Actuation of electric motors in automotive high-voltage networks, e.g. A/C compressors for electric and hybrid vehicles.