Underwater brushless electric steering engine controller

The utility model provides an underwater brushless electric steering engine controller, which is used for position servo control of a rudder plate of an underwater brushless electric steering engine and comprises a secondary power supply circuit, a CPU (central processing unit) circuit, an isolating circuit, a driving circuit, an inverter circuit, a protection circuit and a rudder feedback circuit. The secondary power supply circuit provides required power supplies for the CPU circuit, the isolation circuit, the drive circuit, the inverter circuit, the protection circuit and the rudder feedback circuit. The CPU circuit generates a PWM control signal required by steering engine control according to a position signal provided by the steering feedback circuit and a set position value, the PWM signal and the drive circuit are used for controlling the inverter circuit through the isolation circuit, and meanwhile, the CPU circuit collects motor current in real time through the protection circuit, so that the operat