Efficient control system and method for brushless motor with wide working range

An efficient control method for a brushless motor with a wide working range, comprising:

• at a system including a power supplying module, a first DC-DC circuit, a battery pack, a second DC-DC circuit, an anti-reverse-connection circuit, an electronic speed control (ESC), a brushless direct current motor (BLDC), an airborne controller, a communication link, wherein the power supplying module outputs regulated direct currents to energize the battery pack through the first DC-DC circuit;
• wherein the battery pack energizes the ESC through the second DC-DC circuit and the anti-reverse-connection circuit in sequence, and the ESC drives the BLDC to rotate;
• wherein the second DC-DC circuit uses an adjustable DC-DC circuit, which changes an output voltage according to an input signal;
• wherein the communication link is configured to transmit an original throttle signal output by a flight control system to the airborne controller;
• and wherein the airborne controller is configured to acquire input/output voltage and current information from the first DC-DC circuit and output voltage and current information of the battery pack for monitoring, make the original throttle signal transmitted from the communication link correspond to a power demand of a power system, output two control signals according to a relationship between a power demand of a current aircraft and a set power threshold, and a first control signal is output to the ESC for controlling throttle thrust of the ESC, and a second control signal is output to the second DC-DC circuit for controlling the second DC-DC circuit to output a matched voltage:
• receiving, by the airborne controller, the original throttle signal output by the flight control system via a communication link, and mapping the original throttle signal to the power demand of the power system so as to obtain the power demand of the power system at a current time point;
• and
• determining the power demand of the power system, including:
• when the power demand of the power system is less than or equal to a preset power threshold, outputting, by the flight control system, the control signal of the ESC to change an actual throttle value, and simultaneously controlling, by the airborne controller, the second DC-DC circuit to energize with a reference voltage, the reference voltage being the lowest voltage output by the second DC-DC circuit that is the lowest voltage supported by the ESC;
• and
• when the power demand of the power system is greater than the preset power threshold, simultaneously changing, by the airborne controller, the throttle thrust of the ESC and the output voltage of the second DC-DC circuit according to a joint adjustment strategy so as to realize high-power power output.